/*!
 * Copyright (c) 2026-present, Vanilagy and contributors
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */
"use strict";
var Mediabunny = (() => {
  var __create = Object.create;
  var __defProp = Object.defineProperty;
  var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
  var __getOwnPropNames = Object.getOwnPropertyNames;
  var __getProtoOf = Object.getPrototypeOf;
  var __hasOwnProp = Object.prototype.hasOwnProperty;
  var __knownSymbol = (name, symbol) => (symbol = Symbol[name]) ? symbol : Symbol.for("Symbol." + name);
  var __typeError = (msg) => {
    throw TypeError(msg);
  };
  var __commonJS = (cb, mod) => function __require() {
    return mod || (0, cb[__getOwnPropNames(cb)[0]])((mod = { exports: {} }).exports, mod), mod.exports;
  };
  var __export = (target, all) => {
    for (var name in all)
      __defProp(target, name, { get: all[name], enumerable: true });
  };
  var __copyProps = (to, from, except, desc2) => {
    if (from && typeof from === "object" || typeof from === "function") {
      for (let key of __getOwnPropNames(from))
        if (!__hasOwnProp.call(to, key) && key !== except)
          __defProp(to, key, { get: () => from[key], enumerable: !(desc2 = __getOwnPropDesc(from, key)) || desc2.enumerable });
    }
    return to;
  };
  var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
    // If the importer is in node compatibility mode or this is not an ESM
    // file that has been converted to a CommonJS file using a Babel-
    // compatible transform (i.e. "__esModule" has not been set), then set
    // "default" to the CommonJS "module.exports" for node compatibility.
    isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
    mod
  ));
  var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
  var __using = (stack, value, async) => {
    if (value != null) {
      if (typeof value !== "object" && typeof value !== "function") __typeError("Object expected");
      var dispose, inner;
      if (async) dispose = value[__knownSymbol("asyncDispose")];
      if (dispose === void 0) {
        dispose = value[__knownSymbol("dispose")];
        if (async) inner = dispose;
      }
      if (typeof dispose !== "function") __typeError("Object not disposable");
      if (inner) dispose = function() {
        try {
          inner.call(this);
        } catch (e) {
          return Promise.reject(e);
        }
      };
      stack.push([async, dispose, value]);
    } else if (async) {
      stack.push([async]);
    }
    return value;
  };
  var __callDispose = (stack, error, hasError) => {
    var E = typeof SuppressedError === "function" ? SuppressedError : function(e, s, m, _) {
      return _ = Error(m), _.name = "SuppressedError", _.error = e, _.suppressed = s, _;
    };
    var fail = (e) => error = hasError ? new E(e, error, "An error was suppressed during disposal") : (hasError = true, e);
    var next = (it) => {
      while (it = stack.pop()) {
        try {
          var result = it[1] && it[1].call(it[2]);
          if (it[0]) return Promise.resolve(result).then(next, (e) => (fail(e), next()));
        } catch (e) {
          fail(e);
        }
      }
      if (hasError) throw error;
    };
    return next();
  };

  // (disabled):src/node
  var require_node = __commonJS({
    "(disabled):src/node"() {
    }
  });

  // src/index.ts
  var index_exports = {};
  __export(index_exports, {
    ADTS: () => ADTS,
    ALL_FORMATS: () => ALL_FORMATS,
    ALL_TRACK_TYPES: () => ALL_TRACK_TYPES,
    AUDIO_CODECS: () => AUDIO_CODECS,
    AdtsInputFormat: () => AdtsInputFormat,
    AdtsOutputFormat: () => AdtsOutputFormat,
    AppendOnlyStreamTarget: () => AppendOnlyStreamTarget,
    AttachedFile: () => AttachedFile,
    AudioBufferSink: () => AudioBufferSink,
    AudioBufferSource: () => AudioBufferSource,
    AudioSample: () => AudioSample,
    AudioSampleResource: () => AudioSampleResource,
    AudioSampleSink: () => AudioSampleSink,
    AudioSampleSource: () => AudioSampleSource,
    AudioSource: () => AudioSource,
    BaseMediaSampleSink: () => BaseMediaSampleSink,
    BlobSource: () => BlobSource,
    BufferSource: () => BufferSource,
    BufferTarget: () => BufferTarget,
    CanvasSink: () => CanvasSink,
    CanvasSource: () => CanvasSource,
    CmafOutputFormat: () => CmafOutputFormat,
    ConcurrentRunner: () => ConcurrentRunner,
    Conversion: () => Conversion,
    ConversionCanceledError: () => ConversionCanceledError,
    CustomAudioDecoder: () => CustomAudioDecoder,
    CustomAudioEncoder: () => CustomAudioEncoder,
    CustomPathedSource: () => CustomPathedSource,
    CustomSource: () => CustomSource,
    CustomVideoDecoder: () => CustomVideoDecoder,
    CustomVideoEncoder: () => CustomVideoEncoder,
    EncodedAudioPacketSource: () => EncodedAudioPacketSource,
    EncodedPacket: () => EncodedPacket,
    EncodedPacketSink: () => EncodedPacketSink,
    EncodedVideoPacketSource: () => EncodedVideoPacketSource,
    EventEmitter: () => EventEmitter,
    FLAC: () => FLAC,
    FilePathSource: () => FilePathSource,
    FilePathTarget: () => FilePathTarget,
    FlacInputFormat: () => FlacInputFormat,
    FlacOutputFormat: () => FlacOutputFormat,
    HLS: () => HLS,
    HLS_FORMATS: () => HLS_FORMATS,
    HlsInputFormat: () => HlsInputFormat,
    HlsOutputFormat: () => HlsOutputFormat,
    Input: () => Input,
    InputAudioTrack: () => InputAudioTrack,
    InputDisposedError: () => InputDisposedError,
    InputFormat: () => InputFormat,
    InputTrack: () => InputTrack,
    InputVideoTrack: () => InputVideoTrack,
    IsobmffInputFormat: () => IsobmffInputFormat,
    IsobmffOutputFormat: () => IsobmffOutputFormat2,
    LogLevel: () => LogLevel,
    Logging: () => Logging,
    MATROSKA: () => MATROSKA,
    MP3: () => MP3,
    MP4: () => MP4,
    MPEG_TS: () => MPEG_TS,
    MatroskaInputFormat: () => MatroskaInputFormat,
    MediaSource: () => MediaSource,
    MediaStreamAudioTrackSource: () => MediaStreamAudioTrackSource,
    MediaStreamVideoTrackSource: () => MediaStreamVideoTrackSource,
    MkvOutputFormat: () => MkvOutputFormat2,
    MovOutputFormat: () => MovOutputFormat,
    Mp3InputFormat: () => Mp3InputFormat,
    Mp3OutputFormat: () => Mp3OutputFormat,
    Mp4InputFormat: () => Mp4InputFormat,
    Mp4OutputFormat: () => Mp4OutputFormat,
    MpegTsInputFormat: () => MpegTsInputFormat,
    MpegTsOutputFormat: () => MpegTsOutputFormat,
    NON_PCM_AUDIO_CODECS: () => NON_PCM_AUDIO_CODECS,
    NullTarget: () => NullTarget,
    OGG: () => OGG,
    OggInputFormat: () => OggInputFormat,
    OggOutputFormat: () => OggOutputFormat,
    Output: () => Output,
    OutputAudioTrack: () => OutputAudioTrack2,
    OutputFormat: () => OutputFormat,
    OutputSubtitleTrack: () => OutputSubtitleTrack2,
    OutputTrack: () => OutputTrack2,
    OutputTrackGroup: () => OutputTrackGroup,
    OutputVideoTrack: () => OutputVideoTrack2,
    PCM_AUDIO_CODECS: () => PCM_AUDIO_CODECS,
    PathedSource: () => PathedSource,
    PathedTarget: () => PathedTarget,
    QTFF: () => QTFF,
    QUALITY_HIGH: () => QUALITY_HIGH,
    QUALITY_LOW: () => QUALITY_LOW,
    QUALITY_MEDIUM: () => QUALITY_MEDIUM,
    QUALITY_VERY_HIGH: () => QUALITY_VERY_HIGH,
    QUALITY_VERY_LOW: () => QUALITY_VERY_LOW,
    Quality: () => Quality,
    QuickTimeInputFormat: () => QuickTimeInputFormat,
    RangedSource: () => RangedSource,
    RangedTarget: () => RangedTarget,
    ReadableStreamSource: () => ReadableStreamSource,
    RichImageData: () => RichImageData,
    SUBTITLE_CODECS: () => SUBTITLE_CODECS,
    Source: () => Source,
    SourceRef: () => SourceRef,
    StreamSource: () => StreamSource,
    StreamTarget: () => StreamTarget,
    SubtitleSource: () => SubtitleSource,
    Target: () => Target,
    TextSubtitleSource: () => TextSubtitleSource,
    UnsupportedInputFormatError: () => UnsupportedInputFormatError,
    UrlSource: () => UrlSource,
    VIDEO_CODECS: () => VIDEO_CODECS,
    VIDEO_SAMPLE_PIXEL_FORMATS: () => VIDEO_SAMPLE_PIXEL_FORMATS,
    VideoSample: () => VideoSample,
    VideoSampleColorSpace: () => VideoSampleColorSpace,
    VideoSampleResource: () => VideoSampleResource,
    VideoSampleSink: () => VideoSampleSink,
    VideoSampleSource: () => VideoSampleSource,
    VideoSource: () => VideoSource,
    WAVE: () => WAVE,
    WEBM: () => WEBM,
    WavOutputFormat: () => WavOutputFormat,
    WaveInputFormat: () => WaveInputFormat,
    WebMInputFormat: () => WebMInputFormat,
    WebMOutputFormat: () => WebMOutputFormat,
    asc: () => asc,
    canDecode: () => canDecode,
    canDecodeAudio: () => canDecodeAudio,
    canDecodeVideo: () => canDecodeVideo,
    canEncode: () => canEncode,
    canEncodeAudio: () => canEncodeAudio,
    canEncodeSubtitles: () => canEncodeSubtitles,
    canEncodeVideo: () => canEncodeVideo,
    desc: () => desc,
    getDecodableAudioCodecs: () => getDecodableAudioCodecs,
    getDecodableCodecs: () => getDecodableCodecs,
    getDecodableVideoCodecs: () => getDecodableVideoCodecs,
    getEncodableAudioCodecs: () => getEncodableAudioCodecs,
    getEncodableCodecs: () => getEncodableCodecs,
    getEncodableSubtitleCodecs: () => getEncodableSubtitleCodecs,
    getEncodableVideoCodecs: () => getEncodableVideoCodecs,
    getFirstEncodableAudioCodec: () => getFirstEncodableAudioCodec,
    getFirstEncodableSubtitleCodec: () => getFirstEncodableSubtitleCodec,
    getFirstEncodableVideoCodec: () => getFirstEncodableVideoCodec,
    prefer: () => prefer,
    registerDecoder: () => registerDecoder,
    registerEncoder: () => registerEncoder,
    registerVideoSampleTransformer: () => registerVideoSampleTransformer
  });

  // src/misc.ts
  function assert(x) {
    if (!x) {
      throw new Error("Assertion failed.");
    }
  }
  var normalizeRotation = (rotation) => {
    const mappedRotation = (rotation % 360 + 360) % 360;
    if (mappedRotation === 0 || mappedRotation === 90 || mappedRotation === 180 || mappedRotation === 270) {
      return mappedRotation;
    } else {
      throw new Error(`Invalid rotation ${rotation}.`);
    }
  };
  var last = (arr) => {
    return arr && arr[arr.length - 1];
  };
  var isU32 = (value) => {
    return value >= 0 && value < 2 ** 32;
  };
  var readExpGolomb = (bitstream) => {
    let leadingZeroBits = 0;
    while (bitstream.readBits(1) === 0 && leadingZeroBits < 32) {
      leadingZeroBits++;
    }
    if (leadingZeroBits >= 32) {
      throw new Error("Invalid exponential-Golomb code.");
    }
    const result = (1 << leadingZeroBits) - 1 + bitstream.readBits(leadingZeroBits);
    return result;
  };
  var readSignedExpGolomb = (bitstream) => {
    const codeNum = readExpGolomb(bitstream);
    return (codeNum & 1) === 0 ? -(codeNum >> 1) : codeNum + 1 >> 1;
  };
  var writeBits = (bytes2, start, end, value) => {
    for (let i = start; i < end; i++) {
      const byteIndex = Math.floor(i / 8);
      let byte = bytes2[byteIndex];
      const bitIndex = 7 - (i & 7);
      byte &= ~(1 << bitIndex);
      byte |= (value & 1 << end - i - 1) >> end - i - 1 << bitIndex;
      bytes2[byteIndex] = byte;
    }
  };
  var toUint8Array = (source) => {
    if (source.constructor === Uint8Array) {
      return source;
    } else if (ArrayBuffer.isView(source)) {
      return new Uint8Array(source.buffer, source.byteOffset, source.byteLength);
    } else {
      return new Uint8Array(source);
    }
  };
  var toDataView = (source) => {
    if (source.constructor === DataView) {
      return source;
    } else if (ArrayBuffer.isView(source)) {
      return new DataView(source.buffer, source.byteOffset, source.byteLength);
    } else {
      return new DataView(source);
    }
  };
  var textDecoder = /* @__PURE__ */ new TextDecoder();
  var textEncoder = /* @__PURE__ */ new TextEncoder();
  var isIso88591Compatible = (text) => {
    for (let i = 0; i < text.length; i++) {
      const code = text.charCodeAt(i);
      if (code > 255) {
        return false;
      }
    }
    return true;
  };
  var invertObject = (object) => {
    return Object.fromEntries(Object.entries(object).map(([key, value]) => [value, key]));
  };
  var COLOR_PRIMARIES_MAP = {
    bt709: 1,
    // ITU-R BT.709
    bt470bg: 5,
    // ITU-R BT.470BG
    smpte170m: 6,
    // ITU-R BT.601 525 - SMPTE 170M
    bt2020: 9,
    // ITU-R BT.202
    smpte432: 12
    // SMPTE EG 432-1
  };
  var COLOR_PRIMARIES_MAP_INVERSE = /* @__PURE__ */ invertObject(COLOR_PRIMARIES_MAP);
  var TRANSFER_CHARACTERISTICS_MAP = {
    "bt709": 1,
    // ITU-R BT.709
    "smpte170m": 6,
    // SMPTE 170M
    "linear": 8,
    // Linear transfer characteristics
    "iec61966-2-1": 13,
    // IEC 61966-2-1
    "pq": 16,
    // Rec. ITU-R BT.2100-2 perceptual quantization (PQ) system
    "hlg": 18
    // Rec. ITU-R BT.2100-2 hybrid loggamma (HLG) system
  };
  var TRANSFER_CHARACTERISTICS_MAP_INVERSE = /* @__PURE__ */ invertObject(TRANSFER_CHARACTERISTICS_MAP);
  var MATRIX_COEFFICIENTS_MAP = {
    "rgb": 0,
    // Identity
    "bt709": 1,
    // ITU-R BT.709
    "bt470bg": 5,
    // ITU-R BT.470BG
    "smpte170m": 6,
    // SMPTE 170M
    "bt2020-ncl": 9
    // ITU-R BT.2020-2 (non-constant luminance)
  };
  var MATRIX_COEFFICIENTS_MAP_INVERSE = /* @__PURE__ */ invertObject(MATRIX_COEFFICIENTS_MAP);
  var colorSpaceIsComplete = (colorSpace) => {
    return !!colorSpace && !!colorSpace.primaries && !!colorSpace.transfer && !!colorSpace.matrix && colorSpace.fullRange !== void 0;
  };
  var isAllowSharedBufferSource = (x) => {
    return x instanceof ArrayBuffer || typeof SharedArrayBuffer !== "undefined" && x instanceof SharedArrayBuffer || ArrayBuffer.isView(x);
  };
  var AsyncMutex = class {
    constructor() {
      this.currentPromise = Promise.resolve();
      this.pending = 0;
    }
    async acquire() {
      let resolver;
      const nextPromise = new Promise((resolve) => {
        let resolved = false;
        resolver = () => {
          if (resolved) {
            return;
          }
          resolve();
          this.pending--;
          resolved = true;
        };
      });
      const currentPromiseAlias = this.currentPromise;
      this.currentPromise = nextPromise;
      this.pending++;
      await currentPromiseAlias;
      return resolver;
    }
  };
  var HEX_STRING_REGEX = /^[0-9a-fA-F]+$/;
  var bytesToHexString = (bytes2) => {
    return [...bytes2].map((x) => x.toString(16).padStart(2, "0")).join("");
  };
  var hexStringToBytes = (hexString) => {
    assert(hexString.length % 2 === 0);
    const bytes2 = new Uint8Array(hexString.length / 2);
    for (let i = 0; i < hexString.length; i += 2) {
      bytes2[i / 2] = parseInt(hexString.slice(i, i + 2), 16);
    }
    return bytes2;
  };
  var reverseBitsU32 = (x) => {
    x = x >> 1 & 1431655765 | (x & 1431655765) << 1;
    x = x >> 2 & 858993459 | (x & 858993459) << 2;
    x = x >> 4 & 252645135 | (x & 252645135) << 4;
    x = x >> 8 & 16711935 | (x & 16711935) << 8;
    x = x >> 16 & 65535 | (x & 65535) << 16;
    return x >>> 0;
  };
  var binarySearchExact = (arr, key, valueGetter) => {
    let low = 0;
    let high = arr.length - 1;
    let ans = -1;
    while (low <= high) {
      const mid = low + high >> 1;
      const midVal = valueGetter(arr[mid]);
      if (midVal === key) {
        ans = mid;
        high = mid - 1;
      } else if (midVal < key) {
        low = mid + 1;
      } else {
        high = mid - 1;
      }
    }
    return ans;
  };
  var binarySearchLessOrEqual = (arr, key, valueGetter) => {
    let low = 0;
    let high = arr.length - 1;
    let ans = -1;
    while (low <= high) {
      const mid = low + (high - low + 1) / 2 | 0;
      const midVal = valueGetter(arr[mid]);
      if (midVal <= key) {
        ans = mid;
        low = mid + 1;
      } else {
        high = mid - 1;
      }
    }
    return ans;
  };
  var insertSorted = (arr, item, valueGetter) => {
    const insertionIndex = binarySearchLessOrEqual(arr, valueGetter(item), valueGetter);
    arr.splice(insertionIndex + 1, 0, item);
  };
  var promiseWithResolvers = () => {
    let resolve;
    let reject;
    const promise = new Promise((res, rej) => {
      resolve = res;
      reject = rej;
    });
    return { promise, resolve, reject };
  };
  var removeItem = (arr, item) => {
    const index = arr.indexOf(item);
    if (index !== -1) {
      arr.splice(index, 1);
    }
  };
  var findLast = (arr, predicate) => {
    for (let i = arr.length - 1; i >= 0; i--) {
      if (predicate(arr[i])) {
        return arr[i];
      }
    }
    return void 0;
  };
  var findLastIndex = (arr, predicate) => {
    for (let i = arr.length - 1; i >= 0; i--) {
      if (predicate(arr[i])) {
        return i;
      }
    }
    return -1;
  };
  var toAsyncIterator = async function* (source) {
    if (Symbol.iterator in source) {
      yield* source[Symbol.iterator]();
    } else {
      yield* source[Symbol.asyncIterator]();
    }
  };
  var validateAnyIterable = (iterable) => {
    if (!(Symbol.iterator in iterable) && !(Symbol.asyncIterator in iterable)) {
      throw new TypeError("Argument must be an iterable or async iterable.");
    }
  };
  var assertNever = (x) => {
    throw new Error(`Unexpected value: ${x}`);
  };
  var getUint24 = (view2, byteOffset, littleEndian) => {
    const byte1 = view2.getUint8(byteOffset);
    const byte2 = view2.getUint8(byteOffset + 1);
    const byte3 = view2.getUint8(byteOffset + 2);
    if (littleEndian) {
      return byte1 | byte2 << 8 | byte3 << 16;
    } else {
      return byte1 << 16 | byte2 << 8 | byte3;
    }
  };
  var getInt24 = (view2, byteOffset, littleEndian) => {
    return getUint24(view2, byteOffset, littleEndian) << 8 >> 8;
  };
  var setUint24 = (view2, byteOffset, value, littleEndian) => {
    value = value >>> 0;
    value = value & 16777215;
    if (littleEndian) {
      view2.setUint8(byteOffset, value & 255);
      view2.setUint8(byteOffset + 1, value >>> 8 & 255);
      view2.setUint8(byteOffset + 2, value >>> 16 & 255);
    } else {
      view2.setUint8(byteOffset, value >>> 16 & 255);
      view2.setUint8(byteOffset + 1, value >>> 8 & 255);
      view2.setUint8(byteOffset + 2, value & 255);
    }
  };
  var setInt24 = (view2, byteOffset, value, littleEndian) => {
    value = clamp(value, -8388608, 8388607);
    if (value < 0) {
      value = value + 16777216 & 16777215;
    }
    setUint24(view2, byteOffset, value, littleEndian);
  };
  var setInt64 = (view2, byteOffset, value, littleEndian) => {
    if (littleEndian) {
      view2.setUint32(byteOffset + 0, value, true);
      view2.setInt32(byteOffset + 4, Math.floor(value / 2 ** 32), true);
    } else {
      view2.setInt32(byteOffset + 0, Math.floor(value / 2 ** 32), true);
      view2.setUint32(byteOffset + 4, value, true);
    }
  };
  var mapAsyncGenerator = (generator, map) => {
    return {
      async next() {
        const result = await generator.next();
        if (result.done) {
          return { value: void 0, done: true };
        } else {
          return { value: map(result.value), done: false };
        }
      },
      return() {
        return generator.return();
      },
      throw(error) {
        return generator.throw(error);
      },
      [Symbol.asyncIterator]() {
        return this;
      }
    };
  };
  var clamp = (value, min, max) => {
    return Math.max(min, Math.min(max, value));
  };
  var lerp = (from, to, t) => {
    return from + (to - from) * t;
  };
  var UNDETERMINED_LANGUAGE = "und";
  var roundIfAlmostInteger = (value) => {
    const rounded = Math.round(value);
    if (Math.abs(value / rounded - 1) < 10 * Number.EPSILON) {
      return rounded;
    } else {
      return value;
    }
  };
  var roundToMultiple = (value, multiple) => {
    return Math.round(value / multiple) * multiple;
  };
  var roundToDivisor = (value, multiple) => {
    return Math.round(value * multiple) / multiple;
  };
  var floorToMultiple = (value, multiple) => {
    return Math.floor(value / multiple) * multiple;
  };
  var floorToDivisor = (value, multiple) => {
    return Math.floor(value * multiple) / multiple;
  };
  var ilog = (x) => {
    let ret = 0;
    while (x) {
      ret++;
      x >>= 1;
    }
    return ret;
  };
  var ISO_639_2_REGEX = /^[a-z]{3}$/;
  var isIso639Dash2LanguageCode = (x) => {
    return ISO_639_2_REGEX.test(x);
  };
  var SECOND_TO_MICROSECOND_FACTOR = 1e6 * (1 + Number.EPSILON);
  var mergeRequestInit = (init1, init2) => {
    const merged = { ...init1, ...init2 };
    if (init1.headers || init2.headers) {
      const headers1 = init1.headers ? normalizeHeaders(init1.headers) : {};
      const headers2 = init2.headers ? normalizeHeaders(init2.headers) : {};
      const mergedHeaders = { ...headers1 };
      Object.entries(headers2).forEach(([key2, value2]) => {
        const existingKey = Object.keys(mergedHeaders).find(
          (key1) => key1.toLowerCase() === key2.toLowerCase()
        );
        if (existingKey) {
          delete mergedHeaders[existingKey];
        }
        mergedHeaders[key2] = value2;
      });
      merged.headers = mergedHeaders;
    }
    return merged;
  };
  var normalizeHeaders = (headers) => {
    if (headers instanceof Headers) {
      const result = {};
      headers.forEach((value, key) => {
        result[key] = value;
      });
      return result;
    }
    if (Array.isArray(headers)) {
      const result = {};
      headers.forEach(([key, value]) => {
        result[key] = value;
      });
      return result;
    }
    return headers;
  };
  var retriedFetch = async (fetchFn, url2, requestInit, getRetryDelay, shouldStop) => {
    let attempts = 0;
    while (true) {
      try {
        return await fetchFn(url2, requestInit);
      } catch (error) {
        if (shouldStop()) {
          throw error;
        }
        attempts++;
        const retryDelayInSeconds = getRetryDelay(attempts, error, url2);
        if (retryDelayInSeconds === null) {
          throw error;
        }
        Logging._error("Retrying failed fetch. Error:", error);
        if (!Number.isFinite(retryDelayInSeconds) || retryDelayInSeconds < 0) {
          throw new TypeError("Retry delay must be a non-negative finite number.");
        }
        if (retryDelayInSeconds > 0) {
          await wait(1e3 * retryDelayInSeconds);
        }
        if (shouldStop()) {
          throw error;
        }
      }
    }
  };
  var computeRationalApproximation = (x, maxDenominator) => {
    const sign = x < 0 ? -1 : 1;
    x = Math.abs(x);
    let prevNumerator = 0, prevDenominator = 1;
    let currNumerator = 1, currDenominator = 0;
    let remainder = x;
    while (true) {
      const integer = Math.floor(remainder);
      const nextNumerator = integer * currNumerator + prevNumerator;
      const nextDenominator = integer * currDenominator + prevDenominator;
      if (nextDenominator > maxDenominator) {
        return {
          num: sign * currNumerator,
          den: currDenominator
        };
      }
      prevNumerator = currNumerator;
      prevDenominator = currDenominator;
      currNumerator = nextNumerator;
      currDenominator = nextDenominator;
      remainder = 1 / (remainder - integer);
      if (!isFinite(remainder)) {
        break;
      }
    }
    return {
      num: sign * currNumerator,
      den: currDenominator
    };
  };
  var CallSerializer = class {
    constructor() {
      this.currentPromise = Promise.resolve();
    }
    call(fn) {
      return this.currentPromise = this.currentPromise.then(fn);
    }
  };
  var isWebKitCache = null;
  var isWebKit = () => {
    if (isWebKitCache !== null) {
      return isWebKitCache;
    }
    return isWebKitCache = !!(typeof navigator !== "undefined" && // eslint-disable-next-line @typescript-eslint/no-deprecated
    (navigator.vendor?.match(/apple/i) || /AppleWebKit/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent) || /\b(iPad|iPhone|iPod)\b/.test(navigator.userAgent)));
  };
  var isFirefoxCache = null;
  var isFirefox = () => {
    if (isFirefoxCache !== null) {
      return isFirefoxCache;
    }
    return isFirefoxCache = typeof navigator !== "undefined" && navigator.userAgent?.includes("Firefox");
  };
  var isChromiumCache = null;
  var isChromium = () => {
    if (isChromiumCache !== null) {
      return isChromiumCache;
    }
    return isChromiumCache = !!(typeof navigator !== "undefined" && (navigator.vendor?.includes("Google Inc") || /Chrome/.test(navigator.userAgent)));
  };
  var chromiumVersionCache = null;
  var getChromiumVersion = () => {
    if (chromiumVersionCache !== null) {
      return chromiumVersionCache;
    }
    if (typeof navigator === "undefined") {
      return null;
    }
    const match = /\bChrome\/(\d+)/.exec(navigator.userAgent);
    if (!match) {
      return null;
    }
    return chromiumVersionCache = Number(match[1]);
  };
  var coalesceIndex = (a, b) => {
    return a !== -1 ? a : b;
  };
  var closedIntervalsOverlap = (startA, endA, startB, endB) => {
    return startA <= endB && startB <= endA;
  };
  var keyValueIterator = function* (object) {
    for (const key in object) {
      const value = object[key];
      if (value === void 0) {
        continue;
      }
      yield { key, value };
    }
  };
  var imageMimeTypeToExtension = (mimeType) => {
    switch (mimeType.toLowerCase()) {
      case "image/jpeg":
      case "image/jpg":
        return ".jpg";
      case "image/png":
        return ".png";
      case "image/gif":
        return ".gif";
      case "image/webp":
        return ".webp";
      case "image/bmp":
        return ".bmp";
      case "image/svg+xml":
        return ".svg";
      case "image/tiff":
        return ".tiff";
      case "image/avif":
        return ".avif";
      case "image/x-icon":
      case "image/vnd.microsoft.icon":
        return ".ico";
      default:
        return null;
    }
  };
  var base64ToBytes = (base64) => {
    const decoded = atob(base64);
    const bytes2 = new Uint8Array(decoded.length);
    for (let i = 0; i < decoded.length; i++) {
      bytes2[i] = decoded.charCodeAt(i);
    }
    return bytes2;
  };
  var bytesToBase64 = (bytes2) => {
    let string = "";
    for (let i = 0; i < bytes2.length; i++) {
      string += String.fromCharCode(bytes2[i]);
    }
    return btoa(string);
  };
  var uint8ArraysAreEqual = (a, b) => {
    if (a.length !== b.length) {
      return false;
    }
    for (let i = 0; i < a.length; i++) {
      if (a[i] !== b[i]) {
        return false;
      }
    }
    return true;
  };
  var polyfillSymbolDispose = () => {
    Symbol.dispose ??= Symbol("Symbol.dispose");
  };
  var isNumber = (x) => {
    return typeof x === "number" && !Number.isNaN(x);
  };
  var joinPaths = (basePath, relativePath) => {
    if (relativePath.includes("://")) {
      return relativePath;
    }
    if (basePath.includes("://")) {
      const queryIndex = basePath.indexOf("?");
      if (queryIndex !== -1) {
        basePath = basePath.slice(0, queryIndex);
      }
    }
    let result;
    if (relativePath.startsWith("/")) {
      const protocolIndex2 = basePath.indexOf("://");
      if (protocolIndex2 === -1) {
        result = relativePath;
      } else {
        const pathStart = basePath.indexOf("/", protocolIndex2 + 3);
        if (pathStart === -1) {
          result = basePath + relativePath;
        } else {
          result = basePath.slice(0, pathStart) + relativePath;
        }
      }
    } else {
      const lastSlash = basePath.lastIndexOf("/");
      if (lastSlash === -1) {
        result = relativePath;
      } else {
        result = basePath.slice(0, lastSlash + 1) + relativePath;
      }
    }
    let prefix = "";
    const protocolIndex = result.indexOf("://");
    if (protocolIndex !== -1) {
      const pathStart = result.indexOf("/", protocolIndex + 3);
      if (pathStart !== -1) {
        prefix = result.slice(0, pathStart);
        result = result.slice(pathStart);
      }
    }
    const segments = result.split("/");
    const normalized = [];
    for (const segment of segments) {
      if (segment === "..") {
        normalized.pop();
      } else if (segment !== ".") {
        normalized.push(segment);
      }
    }
    return prefix + normalized.join("/");
  };
  var arrayCount = (array, predicate) => {
    let count = 0;
    for (let i = 0; i < array.length; i++) {
      if (predicate(array[i])) {
        count++;
      }
    }
    return count;
  };
  var arrayArgmin = (array, getValue) => {
    let minIndex = -1;
    let minValue = Infinity;
    for (let i = 0; i < array.length; i++) {
      const value = getValue(array[i]);
      if (value < minValue) {
        minValue = value;
        minIndex = i;
      }
    }
    return minIndex;
  };
  var arrayArgmax = (array, getValue) => {
    let maxIndex = -1;
    let maxValue = -Infinity;
    for (let i = 0; i < array.length; i++) {
      const value = getValue(array[i]);
      if (value > maxValue) {
        maxValue = value;
        maxIndex = i;
      }
    }
    return maxIndex;
  };
  var simplifyRational = (rational) => {
    assert(Number.isInteger(rational.num));
    assert(Number.isInteger(rational.den));
    assert(rational.den !== 0);
    let a = Math.abs(rational.num);
    let b = Math.abs(rational.den);
    while (b !== 0) {
      const t = a % b;
      a = b;
      b = t;
    }
    const gcd = a || 1;
    return {
      num: rational.num / gcd,
      den: rational.den / gcd
    };
  };
  var validateRectangle = (rect, propertyPath) => {
    if (typeof rect !== "object" || !rect) {
      throw new TypeError(`${propertyPath} must be an object.`);
    }
    if (!Number.isInteger(rect.left) || rect.left < 0) {
      throw new TypeError(`${propertyPath}.left must be a non-negative integer.`);
    }
    if (!Number.isInteger(rect.top) || rect.top < 0) {
      throw new TypeError(`${propertyPath}.top must be a non-negative integer.`);
    }
    if (!Number.isInteger(rect.width) || rect.width < 0) {
      throw new TypeError(`${propertyPath}.width must be a non-negative integer.`);
    }
    if (!Number.isInteger(rect.height) || rect.height < 0) {
      throw new TypeError(`${propertyPath}.height must be a non-negative integer.`);
    }
  };
  var unthrottledTimerWorker;
  var nextUnthrottledTimerId = 1;
  var unthrottledTimeoutCallbacks = /* @__PURE__ */ new Map();
  var unthrottledIntervalCallbacks = /* @__PURE__ */ new Map();
  var shouldUseNativeTimers = () => {
    return typeof window === "undefined";
  };
  var unthrottledTimerWorkerMain = () => {
    const timeoutHandles = /* @__PURE__ */ new Map();
    const intervalHandles = /* @__PURE__ */ new Map();
    self.onmessage = (event) => {
      const message = event.data;
      switch (message.type) {
        case "set-timeout":
          {
            const handle = setTimeout(() => {
              timeoutHandles.delete(message.timerId);
              self.postMessage({ type: "fire", timerId: message.timerId });
            }, message.delay);
            timeoutHandles.set(message.timerId, handle);
          }
          ;
          break;
        case "set-interval":
          {
            const handle = setInterval(() => {
              self.postMessage({ type: "fire", timerId: message.timerId });
            }, message.delay);
            intervalHandles.set(message.timerId, handle);
          }
          ;
          break;
        case "clear-timeout":
          {
            const handle = timeoutHandles.get(message.timerId);
            if (handle !== void 0) {
              clearTimeout(handle);
              timeoutHandles.delete(message.timerId);
            }
          }
          ;
          break;
        case "clear-interval":
          {
            const handle = intervalHandles.get(message.timerId);
            if (handle !== void 0) {
              clearInterval(handle);
              intervalHandles.delete(message.timerId);
            }
          }
          ;
          break;
      }
    };
  };
  var getUnthrottledTimerWorker = () => {
    if (unthrottledTimerWorker) {
      return unthrottledTimerWorker;
    }
    const workerSource = `(${unthrottledTimerWorkerMain.toString()})();`;
    const workerURL = URL.createObjectURL(new Blob([workerSource], { type: "text/javascript" }));
    unthrottledTimerWorker = new Worker(workerURL);
    URL.revokeObjectURL(workerURL);
    unthrottledTimerWorker.onmessage = (event) => {
      const message = event.data;
      const timeoutCallback = unthrottledTimeoutCallbacks.get(message.timerId);
      if (timeoutCallback) {
        unthrottledTimeoutCallbacks.delete(message.timerId);
        timeoutCallback();
        return;
      }
      const intervalCallback = unthrottledIntervalCallbacks.get(message.timerId);
      if (intervalCallback) {
        intervalCallback();
      }
    };
    return unthrottledTimerWorker;
  };
  var setIntervalUnthrottled = (callback, delay) => {
    if (shouldUseNativeTimers()) {
      return { id: setInterval(callback, delay) };
    }
    const timerId = nextUnthrottledTimerId++;
    unthrottledIntervalCallbacks.set(timerId, () => {
      callback();
    });
    getUnthrottledTimerWorker().postMessage({
      type: "set-interval",
      timerId,
      delay
    });
    return { id: timerId };
  };
  var clearIntervalUnthrottled = (timer) => {
    if (shouldUseNativeTimers()) {
      clearInterval(timer.id);
      return;
    }
    assert(typeof timer.id === "number");
    unthrottledIntervalCallbacks.delete(timer.id);
    getUnthrottledTimerWorker().postMessage({
      type: "clear-interval",
      timerId: timer.id
    });
  };
  var wait = (ms) => {
    return new Promise((resolve) => setTimeout(resolve, ms));
  };
  var toArray = (x) => {
    if (Array.isArray(x)) {
      return x;
    } else {
      return [x];
    }
  };
  var EventEmitter = class {
    constructor() {
      /** @internal */
      this._listeners = /* @__PURE__ */ new Map();
    }
    /** Registers a listener for the given event. Returns a function that, when called, removes the listener again. */
    on(event, listener, options) {
      if (!this._listeners.has(event)) {
        this._listeners.set(event, /* @__PURE__ */ new Set());
      }
      const entry = { fn: listener, once: options?.once ?? false };
      this._listeners.get(event).add(entry);
      return () => {
        this._listeners.get(event)?.delete(entry);
      };
    }
    /** @internal */
    _emit(...args) {
      const [event, data] = args;
      const listeners = this._listeners.get(event);
      if (!listeners) {
        return;
      }
      for (const entry of listeners) {
        try {
          entry.fn(data);
        } catch (error) {
          console.error(error);
        }
        if (entry.once) {
          listeners.delete(entry);
        }
      }
    }
  };
  var ceilToMultipleOfTwo = (value) => Math.ceil(value / 2) * 2;
  var ConcurrentRunner = class {
    constructor(parallelism) {
      /** @internal */
      this._queue = [];
      /** @internal */
      this._errored = false;
      this.parallelism = parallelism;
    }
    /** Whether any function has errored. The runner is effectively bricked if this is `true`, by design. */
    get errored() {
      return this._errored;
    }
    /** The number of tasks currently running. */
    get inFlightCount() {
      return this._queue.length;
    }
    /**
     * Schedules an async function to be run. If the maximum allowed level of parallelism has not yet been reached,
     * the function will be executed immediately and `run()` will resolve immediately. Otherwise, the function will be
     * called as soon as any currently-running function finishes, and `run()` will only resolve then.
     *
     * Throws if the runner is errored.
     */
    async run(fn) {
      if (this._errored) {
        await Promise.race(this._queue);
      }
      while (this._queue.length >= this.parallelism) {
        await Promise.race(this._queue);
      }
      const promise = fn();
      this._queue.push(promise);
      void promise.then(() => removeItem(this._queue, promise)).catch(() => this._errored = true);
    }
    /** Waits for all currently running functions to finish. Throws if the runner is errored. */
    async flush() {
      await Promise.all(this._queue);
    }
  };
  var isRecordStringString = (value) => {
    return value !== null && typeof value === "object" && Object.getPrototypeOf(value) === Object.prototype && Object.values(value).every((x) => typeof x === "string");
  };

  // src/logging.ts
  var LogLevel = /* @__PURE__ */ ((LogLevel2) => {
    LogLevel2[LogLevel2["Silent"] = 0] = "Silent";
    LogLevel2[LogLevel2["Errors"] = 1] = "Errors";
    LogLevel2[LogLevel2["Warnings"] = 2] = "Warnings";
    LogLevel2[LogLevel2["Info"] = 3] = "Info";
    return LogLevel2;
  })(LogLevel || {});
  var _Logging = class _Logging {
    constructor() {
    }
    /** The current log level. Defaults to {@link LogLevel.Info}. */
    static get level() {
      return _Logging._level;
    }
    static set level(value) {
      if (value !== 0 /* Silent */ && value !== 1 /* Errors */ && value !== 2 /* Warnings */ && value !== 3 /* Info */) {
        throw new TypeError("Invalid log level. Use one of the values of the LogLevel enum.");
      }
      _Logging._level = value;
    }
    /** @internal */
    static get _emitter() {
      return _Logging._emitterInstance ??= new EventEmitter();
    }
    /** Registers a listener for a log event. Returns a function that, when called, removes the listener again. */
    static on(event, listener, options) {
      return _Logging._emitter.on(event, listener, options);
    }
    /** @internal */
    static _error(...args) {
      _Logging._emitter._emit("error", args);
      if (_Logging._level >= 1 /* Errors */) {
        console.error(...args);
      }
    }
    /** @internal */
    static _warn(...args) {
      _Logging._emitter._emit("warn", args);
      if (_Logging._level >= 2 /* Warnings */) {
        console.warn(...args);
      }
    }
    /** @internal */
    static _info(...args) {
      _Logging._emitter._emit("info", args);
      if (_Logging._level >= 3 /* Info */) {
        console.info(...args);
      }
    }
  };
  /** @internal */
  _Logging._level = 3 /* Info */;
  /** @internal */
  _Logging._emitterInstance = null;
  var Logging = _Logging;

  // src/metadata.ts
  var RichImageData = class {
    /** Creates a new {@link RichImageData}. */
    constructor(data, mimeType) {
      this.data = data;
      this.mimeType = mimeType;
      if (!(data instanceof Uint8Array)) {
        throw new TypeError("data must be a Uint8Array.");
      }
      if (typeof mimeType !== "string") {
        throw new TypeError("mimeType must be a string.");
      }
    }
  };
  var AttachedFile = class {
    /** Creates a new {@link AttachedFile}. */
    constructor(data, mimeType, name, description) {
      this.data = data;
      this.mimeType = mimeType;
      this.name = name;
      this.description = description;
      if (!(data instanceof Uint8Array)) {
        throw new TypeError("data must be a Uint8Array.");
      }
      if (mimeType !== void 0 && typeof mimeType !== "string") {
        throw new TypeError("mimeType, when provided, must be a string.");
      }
      if (name !== void 0 && typeof name !== "string") {
        throw new TypeError("name, when provided, must be a string.");
      }
      if (description !== void 0 && typeof description !== "string") {
        throw new TypeError("description, when provided, must be a string.");
      }
    }
  };
  var validateMetadataTags = (tags) => {
    if (!tags || typeof tags !== "object") {
      throw new TypeError("tags must be an object.");
    }
    if (tags.title !== void 0 && typeof tags.title !== "string") {
      throw new TypeError("tags.title, when provided, must be a string.");
    }
    if (tags.description !== void 0 && typeof tags.description !== "string") {
      throw new TypeError("tags.description, when provided, must be a string.");
    }
    if (tags.artist !== void 0 && typeof tags.artist !== "string") {
      throw new TypeError("tags.artist, when provided, must be a string.");
    }
    if (tags.album !== void 0 && typeof tags.album !== "string") {
      throw new TypeError("tags.album, when provided, must be a string.");
    }
    if (tags.albumArtist !== void 0 && typeof tags.albumArtist !== "string") {
      throw new TypeError("tags.albumArtist, when provided, must be a string.");
    }
    if (tags.trackNumber !== void 0 && (!Number.isInteger(tags.trackNumber) || tags.trackNumber <= 0)) {
      throw new TypeError("tags.trackNumber, when provided, must be a positive integer.");
    }
    if (tags.tracksTotal !== void 0 && (!Number.isInteger(tags.tracksTotal) || tags.tracksTotal <= 0)) {
      throw new TypeError("tags.tracksTotal, when provided, must be a positive integer.");
    }
    if (tags.discNumber !== void 0 && (!Number.isInteger(tags.discNumber) || tags.discNumber <= 0)) {
      throw new TypeError("tags.discNumber, when provided, must be a positive integer.");
    }
    if (tags.discsTotal !== void 0 && (!Number.isInteger(tags.discsTotal) || tags.discsTotal <= 0)) {
      throw new TypeError("tags.discsTotal, when provided, must be a positive integer.");
    }
    if (tags.genre !== void 0 && typeof tags.genre !== "string") {
      throw new TypeError("tags.genre, when provided, must be a string.");
    }
    if (tags.date !== void 0 && (!(tags.date instanceof Date) || Number.isNaN(tags.date.getTime()))) {
      throw new TypeError("tags.date, when provided, must be a valid Date.");
    }
    if (tags.lyrics !== void 0 && typeof tags.lyrics !== "string") {
      throw new TypeError("tags.lyrics, when provided, must be a string.");
    }
    if (tags.images !== void 0) {
      if (!Array.isArray(tags.images)) {
        throw new TypeError("tags.images, when provided, must be an array.");
      }
      for (const image of tags.images) {
        if (!image || typeof image !== "object") {
          throw new TypeError("Each image in tags.images must be an object.");
        }
        if (!(image.data instanceof Uint8Array)) {
          throw new TypeError("Each image.data must be a Uint8Array.");
        }
        if (typeof image.mimeType !== "string") {
          throw new TypeError("Each image.mimeType must be a string.");
        }
        if (!["coverFront", "coverBack", "unknown"].includes(image.kind)) {
          throw new TypeError("Each image.kind must be 'coverFront', 'coverBack', or 'unknown'.");
        }
      }
    }
    if (tags.comment !== void 0 && typeof tags.comment !== "string") {
      throw new TypeError("tags.comment, when provided, must be a string.");
    }
    if (tags.raw !== void 0) {
      if (!tags.raw || typeof tags.raw !== "object") {
        throw new TypeError("tags.raw, when provided, must be an object.");
      }
      for (const value of Object.values(tags.raw)) {
        if (value !== null && typeof value !== "string" && !(value instanceof Uint8Array) && !(value instanceof RichImageData) && !(value instanceof AttachedFile) && !isRecordStringString(value)) {
          throw new TypeError(
            "Each value in tags.raw must be a string, Uint8Array, RichImageData, AttachedFile, Record<string, string>, or null."
          );
        }
      }
    }
  };
  var metadataTagsAreEmpty = (tags) => {
    return tags.title === void 0 && tags.description === void 0 && tags.artist === void 0 && tags.album === void 0 && tags.albumArtist === void 0 && tags.trackNumber === void 0 && tags.tracksTotal === void 0 && tags.discNumber === void 0 && tags.discsTotal === void 0 && tags.genre === void 0 && tags.date === void 0 && tags.lyrics === void 0 && (!tags.images || tags.images.length === 0) && tags.comment === void 0 && (tags.raw === void 0 || Object.keys(tags.raw).length === 0);
  };
  var DEFAULT_TRACK_DISPOSITION = {
    default: true,
    primary: true,
    forced: false,
    original: false,
    commentary: false,
    hearingImpaired: false,
    visuallyImpaired: false
  };
  var validateTrackDisposition = (disposition) => {
    if (!disposition || typeof disposition !== "object") {
      throw new TypeError("disposition must be an object.");
    }
    if (disposition.default !== void 0 && typeof disposition.default !== "boolean") {
      throw new TypeError("disposition.default must be a boolean.");
    }
    if (disposition.primary !== void 0 && typeof disposition.primary !== "boolean") {
      throw new TypeError("disposition.primary must be a boolean.");
    }
    if (disposition.forced !== void 0 && typeof disposition.forced !== "boolean") {
      throw new TypeError("disposition.forced must be a boolean.");
    }
    if (disposition.original !== void 0 && typeof disposition.original !== "boolean") {
      throw new TypeError("disposition.original must be a boolean.");
    }
    if (disposition.commentary !== void 0 && typeof disposition.commentary !== "boolean") {
      throw new TypeError("disposition.commentary must be a boolean.");
    }
    if (disposition.hearingImpaired !== void 0 && typeof disposition.hearingImpaired !== "boolean") {
      throw new TypeError("disposition.hearingImpaired must be a boolean.");
    }
    if (disposition.visuallyImpaired !== void 0 && typeof disposition.visuallyImpaired !== "boolean") {
      throw new TypeError("disposition.visuallyImpaired must be a boolean.");
    }
  };

  // shared/bitstream.ts
  var Bitstream = class _Bitstream {
    constructor(bytes2) {
      this.bytes = bytes2;
      /** Current offset in bits. */
      this.pos = 0;
    }
    seekToByte(byteOffset) {
      this.pos = 8 * byteOffset;
    }
    readBit() {
      const byteIndex = Math.floor(this.pos / 8);
      const byte = this.bytes[byteIndex] ?? 0;
      const bitIndex = 7 - (this.pos & 7);
      const bit = (byte & 1 << bitIndex) >> bitIndex;
      this.pos++;
      return bit;
    }
    readBits(n) {
      if (n === 1) {
        return this.readBit();
      }
      let result = 0;
      for (let i = 0; i < n; i++) {
        result <<= 1;
        result |= this.readBit();
      }
      return result;
    }
    writeBits(n, value) {
      const end = this.pos + n;
      for (let i = this.pos; i < end; i++) {
        const byteIndex = Math.floor(i / 8);
        let byte = this.bytes[byteIndex];
        const bitIndex = 7 - (i & 7);
        byte &= ~(1 << bitIndex);
        byte |= (value & 1 << end - i - 1) >> end - i - 1 << bitIndex;
        this.bytes[byteIndex] = byte;
      }
      this.pos = end;
    }
    readAlignedByte() {
      if (this.pos % 8 !== 0) {
        throw new Error("Bitstream is not byte-aligned.");
      }
      const byteIndex = this.pos / 8;
      const byte = this.bytes[byteIndex] ?? 0;
      this.pos += 8;
      return byte;
    }
    skipBits(n) {
      this.pos += n;
    }
    getBitsLeft() {
      return this.bytes.length * 8 - this.pos;
    }
    clone() {
      const clone = new _Bitstream(this.bytes);
      clone.pos = this.pos;
      return clone;
    }
  };

  // shared/aac-misc.ts
  var aacFrequencyTable = [
    96e3,
    88200,
    64e3,
    48e3,
    44100,
    32e3,
    24e3,
    22050,
    16e3,
    12e3,
    11025,
    8e3,
    7350
  ];
  var aacChannelMap = [-1, 1, 2, 3, 4, 5, 6, 8];
  var parseAacAudioSpecificConfig = (bytes2) => {
    if (!bytes2 || bytes2.byteLength < 2) {
      throw new TypeError("AAC description must be at least 2 bytes long.");
    }
    const bitstream = new Bitstream(bytes2);
    let objectType = bitstream.readBits(5);
    if (objectType === 31) {
      objectType = 32 + bitstream.readBits(6);
    }
    const frequencyIndex = bitstream.readBits(4);
    let sampleRate = null;
    if (frequencyIndex === 15) {
      sampleRate = bitstream.readBits(24);
    } else {
      if (frequencyIndex < aacFrequencyTable.length) {
        sampleRate = aacFrequencyTable[frequencyIndex];
      }
    }
    const channelConfiguration = bitstream.readBits(4);
    let numberOfChannels = null;
    if (channelConfiguration >= 1 && channelConfiguration <= 7) {
      numberOfChannels = aacChannelMap[channelConfiguration];
    }
    return {
      objectType,
      frequencyIndex,
      sampleRate,
      channelConfiguration,
      numberOfChannels
    };
  };
  var buildAacAudioSpecificConfig = (config) => {
    let frequencyIndex = aacFrequencyTable.indexOf(config.sampleRate);
    let customSampleRate = null;
    if (frequencyIndex === -1) {
      frequencyIndex = 15;
      customSampleRate = config.sampleRate;
    }
    const channelConfiguration = aacChannelMap.indexOf(config.numberOfChannels);
    if (channelConfiguration === -1) {
      throw new TypeError(`Unsupported number of channels: ${config.numberOfChannels}`);
    }
    let bitCount = 5 + 4 + 4;
    if (config.objectType >= 32) {
      bitCount += 6;
    }
    if (frequencyIndex === 15) {
      bitCount += 24;
    }
    const byteCount = Math.ceil(bitCount / 8);
    const bytes2 = new Uint8Array(byteCount);
    const bitstream = new Bitstream(bytes2);
    if (config.objectType < 32) {
      bitstream.writeBits(5, config.objectType);
    } else {
      bitstream.writeBits(5, 31);
      bitstream.writeBits(6, config.objectType - 32);
    }
    bitstream.writeBits(4, frequencyIndex);
    if (frequencyIndex === 15) {
      bitstream.writeBits(24, customSampleRate);
    }
    bitstream.writeBits(4, channelConfiguration);
    return bytes2;
  };
  var buildAdtsHeaderTemplate = (config) => {
    const header = new Uint8Array(7);
    const bitstream = new Bitstream(header);
    const { objectType, frequencyIndex, channelConfiguration } = config;
    const profile = objectType - 1;
    bitstream.writeBits(12, 4095);
    bitstream.writeBits(1, 0);
    bitstream.writeBits(2, 0);
    bitstream.writeBits(1, 1);
    bitstream.writeBits(2, profile);
    bitstream.writeBits(4, frequencyIndex);
    bitstream.writeBits(1, 0);
    bitstream.writeBits(3, channelConfiguration);
    bitstream.writeBits(1, 0);
    bitstream.writeBits(1, 0);
    bitstream.writeBits(1, 0);
    bitstream.writeBits(1, 0);
    bitstream.skipBits(13);
    bitstream.writeBits(11, 2047);
    bitstream.writeBits(2, 0);
    return { header, bitstream };
  };
  var writeAdtsFrameLength = (bitstream, frameLength) => {
    bitstream.pos = 30;
    bitstream.writeBits(13, frameLength);
  };

  // src/codec.ts
  var VIDEO_CODECS = [
    "avc",
    "hevc",
    "vp9",
    "av1",
    "vp8",
    "prores"
  ];
  var PCM_AUDIO_CODECS = [
    "pcm-s16",
    // We don't prefix 'le' so we're compatible with the WebCodecs-registered PCM codec strings
    "pcm-s16be",
    "pcm-s24",
    "pcm-s24be",
    "pcm-s32",
    "pcm-s32be",
    "pcm-f32",
    "pcm-f32be",
    "pcm-f64",
    "pcm-f64be",
    "pcm-u8",
    "pcm-s8",
    "ulaw",
    "alaw"
  ];
  var NON_PCM_AUDIO_CODECS = [
    "aac",
    "opus",
    "mp3",
    "vorbis",
    "flac",
    "ac3",
    "eac3"
  ];
  var AUDIO_CODECS = [
    ...NON_PCM_AUDIO_CODECS,
    ...PCM_AUDIO_CODECS
  ];
  var SUBTITLE_CODECS = [
    "webvtt"
  ];
  var AVC_LEVEL_TABLE = [
    { maxMacroblocks: 99, maxBitrate: 64e3, maxDpbMbs: 396, level: 10 },
    // Level 1
    { maxMacroblocks: 396, maxBitrate: 192e3, maxDpbMbs: 900, level: 11 },
    // Level 1.1
    { maxMacroblocks: 396, maxBitrate: 384e3, maxDpbMbs: 2376, level: 12 },
    // Level 1.2
    { maxMacroblocks: 396, maxBitrate: 768e3, maxDpbMbs: 2376, level: 13 },
    // Level 1.3
    { maxMacroblocks: 396, maxBitrate: 2e6, maxDpbMbs: 2376, level: 20 },
    // Level 2
    { maxMacroblocks: 792, maxBitrate: 4e6, maxDpbMbs: 4752, level: 21 },
    // Level 2.1
    { maxMacroblocks: 1620, maxBitrate: 4e6, maxDpbMbs: 8100, level: 22 },
    // Level 2.2
    { maxMacroblocks: 1620, maxBitrate: 1e7, maxDpbMbs: 8100, level: 30 },
    // Level 3
    { maxMacroblocks: 3600, maxBitrate: 14e6, maxDpbMbs: 18e3, level: 31 },
    // Level 3.1
    { maxMacroblocks: 5120, maxBitrate: 2e7, maxDpbMbs: 20480, level: 32 },
    // Level 3.2
    { maxMacroblocks: 8192, maxBitrate: 2e7, maxDpbMbs: 32768, level: 40 },
    // Level 4
    { maxMacroblocks: 8192, maxBitrate: 5e7, maxDpbMbs: 32768, level: 41 },
    // Level 4.1
    { maxMacroblocks: 8704, maxBitrate: 5e7, maxDpbMbs: 34816, level: 42 },
    // Level 4.2
    { maxMacroblocks: 22080, maxBitrate: 135e6, maxDpbMbs: 110400, level: 50 },
    // Level 5
    { maxMacroblocks: 36864, maxBitrate: 24e7, maxDpbMbs: 184320, level: 51 },
    // Level 5.1
    { maxMacroblocks: 36864, maxBitrate: 24e7, maxDpbMbs: 184320, level: 52 },
    // Level 5.2
    { maxMacroblocks: 139264, maxBitrate: 24e7, maxDpbMbs: 696320, level: 60 },
    // Level 6
    { maxMacroblocks: 139264, maxBitrate: 48e7, maxDpbMbs: 696320, level: 61 },
    // Level 6.1
    { maxMacroblocks: 139264, maxBitrate: 8e8, maxDpbMbs: 696320, level: 62 }
    // Level 6.2
  ];
  var HEVC_LEVEL_TABLE = [
    { maxPictureSize: 36864, maxBitrate: 128e3, tier: "L", level: 30 },
    // Level 1 (Low Tier)
    { maxPictureSize: 122880, maxBitrate: 15e5, tier: "L", level: 60 },
    // Level 2 (Low Tier)
    { maxPictureSize: 245760, maxBitrate: 3e6, tier: "L", level: 63 },
    // Level 2.1 (Low Tier)
    { maxPictureSize: 552960, maxBitrate: 6e6, tier: "L", level: 90 },
    // Level 3 (Low Tier)
    { maxPictureSize: 983040, maxBitrate: 1e7, tier: "L", level: 93 },
    // Level 3.1 (Low Tier)
    { maxPictureSize: 2228224, maxBitrate: 12e6, tier: "L", level: 120 },
    // Level 4 (Low Tier)
    { maxPictureSize: 2228224, maxBitrate: 3e7, tier: "H", level: 120 },
    // Level 4 (High Tier)
    { maxPictureSize: 2228224, maxBitrate: 2e7, tier: "L", level: 123 },
    // Level 4.1 (Low Tier)
    { maxPictureSize: 2228224, maxBitrate: 5e7, tier: "H", level: 123 },
    // Level 4.1 (High Tier)
    { maxPictureSize: 8912896, maxBitrate: 25e6, tier: "L", level: 150 },
    // Level 5 (Low Tier)
    { maxPictureSize: 8912896, maxBitrate: 1e8, tier: "H", level: 150 },
    // Level 5 (High Tier)
    { maxPictureSize: 8912896, maxBitrate: 4e7, tier: "L", level: 153 },
    // Level 5.1 (Low Tier)
    { maxPictureSize: 8912896, maxBitrate: 16e7, tier: "H", level: 153 },
    // Level 5.1 (High Tier)
    { maxPictureSize: 8912896, maxBitrate: 6e7, tier: "L", level: 156 },
    // Level 5.2 (Low Tier)
    { maxPictureSize: 8912896, maxBitrate: 24e7, tier: "H", level: 156 },
    // Level 5.2 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 6e7, tier: "L", level: 180 },
    // Level 6 (Low Tier)
    { maxPictureSize: 35651584, maxBitrate: 24e7, tier: "H", level: 180 },
    // Level 6 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 12e7, tier: "L", level: 183 },
    // Level 6.1 (Low Tier)
    { maxPictureSize: 35651584, maxBitrate: 48e7, tier: "H", level: 183 },
    // Level 6.1 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 24e7, tier: "L", level: 186 },
    // Level 6.2 (Low Tier)
    { maxPictureSize: 35651584, maxBitrate: 8e8, tier: "H", level: 186 }
    // Level 6.2 (High Tier)
  ];
  var VP9_LEVEL_TABLE = [
    { maxPictureSize: 36864, maxBitrate: 2e5, level: 10 },
    // Level 1
    { maxPictureSize: 73728, maxBitrate: 8e5, level: 11 },
    // Level 1.1
    { maxPictureSize: 122880, maxBitrate: 18e5, level: 20 },
    // Level 2
    { maxPictureSize: 245760, maxBitrate: 36e5, level: 21 },
    // Level 2.1
    { maxPictureSize: 552960, maxBitrate: 72e5, level: 30 },
    // Level 3
    { maxPictureSize: 983040, maxBitrate: 12e6, level: 31 },
    // Level 3.1
    { maxPictureSize: 2228224, maxBitrate: 18e6, level: 40 },
    // Level 4
    { maxPictureSize: 2228224, maxBitrate: 3e7, level: 41 },
    // Level 4.1
    { maxPictureSize: 8912896, maxBitrate: 6e7, level: 50 },
    // Level 5
    { maxPictureSize: 8912896, maxBitrate: 12e7, level: 51 },
    // Level 5.1
    { maxPictureSize: 8912896, maxBitrate: 18e7, level: 52 },
    // Level 5.2
    { maxPictureSize: 35651584, maxBitrate: 18e7, level: 60 },
    // Level 6
    { maxPictureSize: 35651584, maxBitrate: 24e7, level: 61 },
    // Level 6.1
    { maxPictureSize: 35651584, maxBitrate: 48e7, level: 62 }
    // Level 6.2
  ];
  var AV1_LEVEL_TABLE = [
    { maxPictureSize: 147456, maxBitrate: 15e5, tier: "M", level: 0 },
    // Level 2.0 (Main Tier)
    { maxPictureSize: 278784, maxBitrate: 3e6, tier: "M", level: 1 },
    // Level 2.1 (Main Tier)
    { maxPictureSize: 665856, maxBitrate: 6e6, tier: "M", level: 4 },
    // Level 3.0 (Main Tier)
    { maxPictureSize: 1065024, maxBitrate: 1e7, tier: "M", level: 5 },
    // Level 3.1 (Main Tier)
    { maxPictureSize: 2359296, maxBitrate: 12e6, tier: "M", level: 8 },
    // Level 4.0 (Main Tier)
    { maxPictureSize: 2359296, maxBitrate: 3e7, tier: "H", level: 8 },
    // Level 4.0 (High Tier)
    { maxPictureSize: 2359296, maxBitrate: 2e7, tier: "M", level: 9 },
    // Level 4.1 (Main Tier)
    { maxPictureSize: 2359296, maxBitrate: 5e7, tier: "H", level: 9 },
    // Level 4.1 (High Tier)
    { maxPictureSize: 8912896, maxBitrate: 3e7, tier: "M", level: 12 },
    // Level 5.0 (Main Tier)
    { maxPictureSize: 8912896, maxBitrate: 1e8, tier: "H", level: 12 },
    // Level 5.0 (High Tier)
    { maxPictureSize: 8912896, maxBitrate: 4e7, tier: "M", level: 13 },
    // Level 5.1 (Main Tier)
    { maxPictureSize: 8912896, maxBitrate: 16e7, tier: "H", level: 13 },
    // Level 5.1 (High Tier)
    { maxPictureSize: 8912896, maxBitrate: 6e7, tier: "M", level: 14 },
    // Level 5.2 (Main Tier)
    { maxPictureSize: 8912896, maxBitrate: 24e7, tier: "H", level: 14 },
    // Level 5.2 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 6e7, tier: "M", level: 15 },
    // Level 5.3 (Main Tier)
    { maxPictureSize: 35651584, maxBitrate: 24e7, tier: "H", level: 15 },
    // Level 5.3 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 6e7, tier: "M", level: 16 },
    // Level 6.0 (Main Tier)
    { maxPictureSize: 35651584, maxBitrate: 24e7, tier: "H", level: 16 },
    // Level 6.0 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 1e8, tier: "M", level: 17 },
    // Level 6.1 (Main Tier)
    { maxPictureSize: 35651584, maxBitrate: 48e7, tier: "H", level: 17 },
    // Level 6.1 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 16e7, tier: "M", level: 18 },
    // Level 6.2 (Main Tier)
    { maxPictureSize: 35651584, maxBitrate: 8e8, tier: "H", level: 18 },
    // Level 6.2 (High Tier)
    { maxPictureSize: 35651584, maxBitrate: 16e7, tier: "M", level: 19 },
    // Level 6.3 (Main Tier)
    { maxPictureSize: 35651584, maxBitrate: 8e8, tier: "H", level: 19 }
    // Level 6.3 (High Tier)
  ];
  var VP9_DEFAULT_SUFFIX = ".01.01.01.01.00";
  var AV1_DEFAULT_SUFFIX = ".0.110.01.01.01.0";
  var PRORES_FOURCCS = [
    "ap4x",
    // ProRes 4444 XQ
    "ap4h",
    // ProRes 4444
    "apch",
    // ProRes 422 High Quality
    "apcn",
    // ProRes 422 Standard Definition
    "apcs",
    // ProRes 422 LT
    "apco"
    // ProRes 422 Proxy
  ];
  var PRORES_PROFILE_TARGET_BITRATES = [
    { fourCc: "apco", bitrate: 45e6, alpha: false },
    // 422 Proxy
    { fourCc: "apcs", bitrate: 102e6, alpha: false },
    // 422 LT
    { fourCc: "apcn", bitrate: 147e6, alpha: false },
    // 422 Standard
    { fourCc: "apch", bitrate: 22e7, alpha: false },
    // 422 HQ
    { fourCc: "ap4h", bitrate: 33e7, alpha: true },
    // 4444
    { fourCc: "ap4x", bitrate: 5e8, alpha: true }
    // 4444 XQ
  ];
  var buildVideoCodecString = (codec, width, height, bitrate, alpha) => {
    if (codec === "avc") {
      const profileIndication = 100;
      const totalMacroblocks = Math.ceil(width / 16) * Math.ceil(height / 16);
      const levelInfo = AVC_LEVEL_TABLE.find(
        (level) => totalMacroblocks <= level.maxMacroblocks && bitrate <= level.maxBitrate
      ) ?? last(AVC_LEVEL_TABLE);
      const levelIndication = levelInfo ? levelInfo.level : 0;
      const hexProfileIndication = profileIndication.toString(16).padStart(2, "0");
      const hexProfileCompatibility = "00";
      const hexLevelIndication = levelIndication.toString(16).padStart(2, "0");
      return `avc1.${hexProfileIndication}${hexProfileCompatibility}${hexLevelIndication}`;
    } else if (codec === "hevc") {
      const profilePrefix = "";
      const profileIdc = 1;
      const compatibilityFlags = "6";
      const pictureSize = width * height;
      const levelInfo = HEVC_LEVEL_TABLE.find(
        (level) => pictureSize <= level.maxPictureSize && bitrate <= level.maxBitrate
      ) ?? last(HEVC_LEVEL_TABLE);
      const constraintFlags = "B0";
      return `hev1.${profilePrefix}${profileIdc}.${compatibilityFlags}.${levelInfo.tier}${levelInfo.level}.${constraintFlags}`;
    } else if (codec === "vp8") {
      return "vp8";
    } else if (codec === "vp9") {
      const profile = "00";
      const pictureSize = width * height;
      const levelInfo = VP9_LEVEL_TABLE.find(
        (level) => pictureSize <= level.maxPictureSize && bitrate <= level.maxBitrate
      ) ?? last(VP9_LEVEL_TABLE);
      const bitDepth = "08";
      return `vp09.${profile}.${levelInfo.level.toString().padStart(2, "0")}.${bitDepth}`;
    } else if (codec === "av1") {
      const profile = 0;
      const pictureSize = width * height;
      const levelInfo = AV1_LEVEL_TABLE.find(
        (level2) => pictureSize <= level2.maxPictureSize && bitrate <= level2.maxBitrate
      ) ?? last(AV1_LEVEL_TABLE);
      const level = levelInfo.level.toString().padStart(2, "0");
      const bitDepth = "08";
      return `av01.${profile}.${level}${levelInfo.tier}.${bitDepth}`;
    } else if (codec === "prores") {
      const referencePixels = 1920 * 1080;
      const scaleFactor = Math.pow(width * height / referencePixels, 0.95);
      const candidates = PRORES_PROFILE_TARGET_BITRATES.filter((x) => x.alpha === alpha);
      let bestFourCc = candidates[0].fourCc;
      let smallestDifference = Infinity;
      for (const { fourCc, bitrate: targetBitrate } of candidates) {
        const difference = Math.abs(targetBitrate * scaleFactor - bitrate);
        if (difference < smallestDifference) {
          smallestDifference = difference;
          bestFourCc = fourCc;
        }
      }
      return bestFourCc;
    } else {
      assertNever(codec);
    }
    throw new TypeError(`Unhandled codec '${String(codec)}'.`);
  };
  var generateVp9CodecConfigurationFromCodecString = (codecString) => {
    const parts = codecString.split(".");
    const profile = Number(parts[1]);
    const level = Number(parts[2]);
    const bitDepth = Number(parts[3]);
    const chromaSubsampling = parts[4] ? Number(parts[4]) : 1;
    return [
      1,
      1,
      profile,
      2,
      1,
      level,
      3,
      1,
      bitDepth,
      4,
      1,
      chromaSubsampling
    ];
  };
  var generateAv1CodecConfigurationFromCodecString = (codecString) => {
    const parts = codecString.split(".");
    const marker = 1;
    const version = 1;
    const firstByte = (marker << 7) + version;
    const profile = Number(parts[1]);
    const levelAndTier = parts[2];
    const level = Number(levelAndTier.slice(0, -1));
    const secondByte = (profile << 5) + level;
    const tier = levelAndTier.slice(-1) === "H" ? 1 : 0;
    const bitDepth = Number(parts[3]);
    const highBitDepth = bitDepth === 8 ? 0 : 1;
    const twelveBit = 0;
    const monochrome = parts[4] ? Number(parts[4]) : 0;
    const chromaSubsamplingX = parts[5] ? Number(parts[5][0]) : 1;
    const chromaSubsamplingY = parts[5] ? Number(parts[5][1]) : 1;
    const chromaSamplePosition = parts[5] ? Number(parts[5][2]) : 0;
    const thirdByte = (tier << 7) + (highBitDepth << 6) + (twelveBit << 5) + (monochrome << 4) + (chromaSubsamplingX << 3) + (chromaSubsamplingY << 2) + chromaSamplePosition;
    const initialPresentationDelayPresent = 0;
    const fourthByte = initialPresentationDelayPresent;
    return [firstByte, secondByte, thirdByte, fourthByte];
  };
  var extractVideoCodecString = (trackInfo) => {
    const {
      codec,
      codecDescription,
      colorSpace,
      avcCodecInfo,
      hevcCodecInfo,
      vp9CodecInfo,
      av1CodecInfo,
      proresFormat
    } = trackInfo;
    if (codec === "avc") {
      assert(trackInfo.avcType !== null);
      if (avcCodecInfo) {
        const bytes2 = new Uint8Array([
          avcCodecInfo.avcProfileIndication,
          avcCodecInfo.profileCompatibility,
          avcCodecInfo.avcLevelIndication
        ]);
        return `avc${trackInfo.avcType}.${bytesToHexString(bytes2)}`;
      }
      if (!codecDescription || codecDescription.byteLength < 4) {
        throw new TypeError("AVC decoder description is not provided or is not at least 4 bytes long.");
      }
      return `avc${trackInfo.avcType}.${bytesToHexString(codecDescription.subarray(1, 4))}`;
    } else if (codec === "hevc") {
      let generalProfileSpace;
      let generalProfileIdc;
      let compatibilityFlags;
      let generalTierFlag;
      let generalLevelIdc;
      let constraintFlags;
      if (hevcCodecInfo) {
        generalProfileSpace = hevcCodecInfo.generalProfileSpace;
        generalProfileIdc = hevcCodecInfo.generalProfileIdc;
        compatibilityFlags = reverseBitsU32(hevcCodecInfo.generalProfileCompatibilityFlags);
        generalTierFlag = hevcCodecInfo.generalTierFlag;
        generalLevelIdc = hevcCodecInfo.generalLevelIdc;
        constraintFlags = [...hevcCodecInfo.generalConstraintIndicatorFlags];
      } else {
        if (!codecDescription || codecDescription.byteLength < 23) {
          throw new TypeError("HEVC decoder description is not provided or is not at least 23 bytes long.");
        }
        const view2 = toDataView(codecDescription);
        const profileByte = view2.getUint8(1);
        generalProfileSpace = profileByte >> 6 & 3;
        generalProfileIdc = profileByte & 31;
        compatibilityFlags = reverseBitsU32(view2.getUint32(2));
        generalTierFlag = profileByte >> 5 & 1;
        generalLevelIdc = view2.getUint8(12);
        constraintFlags = [];
        for (let i = 0; i < 6; i++) {
          constraintFlags.push(view2.getUint8(6 + i));
        }
      }
      let codecString = "hev1.";
      codecString += ["", "A", "B", "C"][generalProfileSpace] + generalProfileIdc;
      codecString += ".";
      codecString += compatibilityFlags.toString(16).toUpperCase();
      codecString += ".";
      codecString += generalTierFlag === 0 ? "L" : "H";
      codecString += generalLevelIdc;
      while (constraintFlags.length > 0 && constraintFlags[constraintFlags.length - 1] === 0) {
        constraintFlags.pop();
      }
      if (constraintFlags.length > 0) {
        codecString += ".";
        codecString += constraintFlags.map((x) => x.toString(16).toUpperCase()).join(".");
      }
      return codecString;
    } else if (codec === "vp8") {
      return "vp8";
    } else if (codec === "vp9") {
      if (!vp9CodecInfo) {
        const pictureSize = trackInfo.width * trackInfo.height;
        let level2 = last(VP9_LEVEL_TABLE).level;
        for (const entry of VP9_LEVEL_TABLE) {
          if (pictureSize <= entry.maxPictureSize) {
            level2 = entry.level;
            break;
          }
        }
        return `vp09.00.${level2.toString().padStart(2, "0")}.08`;
      }
      const profile = vp9CodecInfo.profile.toString().padStart(2, "0");
      const level = vp9CodecInfo.level.toString().padStart(2, "0");
      const bitDepth = vp9CodecInfo.bitDepth.toString().padStart(2, "0");
      const chromaSubsampling = vp9CodecInfo.chromaSubsampling.toString().padStart(2, "0");
      const colourPrimaries = vp9CodecInfo.colourPrimaries.toString().padStart(2, "0");
      const transferCharacteristics = vp9CodecInfo.transferCharacteristics.toString().padStart(2, "0");
      const matrixCoefficients = vp9CodecInfo.matrixCoefficients.toString().padStart(2, "0");
      const videoFullRangeFlag = vp9CodecInfo.videoFullRangeFlag.toString().padStart(2, "0");
      let string = `vp09.${profile}.${level}.${bitDepth}.${chromaSubsampling}`;
      string += `.${colourPrimaries}.${transferCharacteristics}.${matrixCoefficients}.${videoFullRangeFlag}`;
      if (string.endsWith(VP9_DEFAULT_SUFFIX)) {
        string = string.slice(0, -VP9_DEFAULT_SUFFIX.length);
      }
      return string;
    } else if (codec === "av1") {
      if (!av1CodecInfo) {
        const pictureSize = trackInfo.width * trackInfo.height;
        let level2 = last(VP9_LEVEL_TABLE).level;
        for (const entry of VP9_LEVEL_TABLE) {
          if (pictureSize <= entry.maxPictureSize) {
            level2 = entry.level;
            break;
          }
        }
        return `av01.0.${level2.toString().padStart(2, "0")}M.08`;
      }
      const profile = av1CodecInfo.profile;
      const level = av1CodecInfo.level.toString().padStart(2, "0");
      const tier = av1CodecInfo.tier ? "H" : "M";
      const bitDepth = av1CodecInfo.bitDepth.toString().padStart(2, "0");
      const monochrome = av1CodecInfo.monochrome ? "1" : "0";
      const chromaSubsampling = 100 * av1CodecInfo.chromaSubsamplingX + 10 * av1CodecInfo.chromaSubsamplingY + 1 * (av1CodecInfo.chromaSubsamplingX && av1CodecInfo.chromaSubsamplingY ? av1CodecInfo.chromaSamplePosition : 0);
      const colorPrimaries = colorSpace?.primaries ? COLOR_PRIMARIES_MAP[colorSpace.primaries] : 1;
      const transferCharacteristics = colorSpace?.transfer ? TRANSFER_CHARACTERISTICS_MAP[colorSpace.transfer] : 1;
      const matrixCoefficients = colorSpace?.matrix ? MATRIX_COEFFICIENTS_MAP[colorSpace.matrix] : 1;
      const videoFullRangeFlag = colorSpace?.fullRange ? 1 : 0;
      let string = `av01.${profile}.${level}${tier}.${bitDepth}`;
      string += `.${monochrome}.${chromaSubsampling.toString().padStart(3, "0")}`;
      string += `.${colorPrimaries.toString().padStart(2, "0")}`;
      string += `.${transferCharacteristics.toString().padStart(2, "0")}`;
      string += `.${matrixCoefficients.toString().padStart(2, "0")}`;
      string += `.${videoFullRangeFlag}`;
      if (string.endsWith(AV1_DEFAULT_SUFFIX)) {
        string = string.slice(0, -AV1_DEFAULT_SUFFIX.length);
      }
      return string;
    } else if (codec === "prores") {
      return proresFormat ?? "apch";
    } else if (codec !== null) {
      assertNever(codec);
    }
    throw new TypeError(`Unhandled codec '${codec}'.`);
  };
  var buildAudioCodecString = (codec, numberOfChannels, sampleRate) => {
    if (codec === "aac") {
      if (numberOfChannels >= 2 && sampleRate <= 24e3) {
        return "mp4a.40.29";
      }
      if (sampleRate <= 24e3) {
        return "mp4a.40.5";
      }
      return "mp4a.40.2";
    } else if (codec === "mp3") {
      return "mp3";
    } else if (codec === "opus") {
      return "opus";
    } else if (codec === "vorbis") {
      return "vorbis";
    } else if (codec === "flac") {
      return "flac";
    } else if (codec === "ac3") {
      return "ac-3";
    } else if (codec === "eac3") {
      return "ec-3";
    } else if (PCM_AUDIO_CODECS.includes(codec)) {
      return codec;
    }
    throw new TypeError(`Unhandled codec '${codec}'.`);
  };
  var extractAudioCodecString = (trackInfo) => {
    const { codec, codecDescription, aacCodecInfo } = trackInfo;
    if (codec === "aac") {
      if (!aacCodecInfo) {
        throw new TypeError("AAC codec info must be provided.");
      }
      if (aacCodecInfo.isMpeg2) {
        return "mp4a.67";
      } else {
        let objectType;
        if (aacCodecInfo.objectType !== null) {
          objectType = aacCodecInfo.objectType;
        } else {
          const audioSpecificConfig = parseAacAudioSpecificConfig(codecDescription);
          objectType = audioSpecificConfig.objectType;
        }
        return `mp4a.40.${objectType}`;
      }
    } else if (codec === "mp3") {
      return "mp3";
    } else if (codec === "opus") {
      return "opus";
    } else if (codec === "vorbis") {
      return "vorbis";
    } else if (codec === "flac") {
      return "flac";
    } else if (codec === "ac3") {
      return "ac-3";
    } else if (codec === "eac3") {
      return "ec-3";
    } else if (codec && PCM_AUDIO_CODECS.includes(codec)) {
      return codec;
    }
    throw new TypeError(`Unhandled codec '${codec}'.`);
  };
  var guessDescriptionForVideo = (decoderConfig) => {
    return void 0;
  };
  var guessDescriptionForAudio = (decoderConfig) => {
    switch (decoderConfig.codec) {
      case "flac":
        {
          const referenceDescription = base64ToBytes("ZkxhQ4AAACIQABAAAAYtACWtCsRC8AANRBhVFucAcYu5ASE2m1Dxv8tw");
          if (decoderConfig.sampleRate >= 1 << 20 || decoderConfig.numberOfChannels > 8) {
            return false;
          }
          referenceDescription[18] = decoderConfig.sampleRate >>> 12;
          referenceDescription[19] = decoderConfig.sampleRate >>> 4;
          referenceDescription[20] = (decoderConfig.sampleRate & 15) << 4 | decoderConfig.numberOfChannels - 1 << 1;
          return referenceDescription;
        }
        ;
      case "vorbis":
        {
          const referenceDescription = base64ToBytes("Ah7/AgF2b3JiaXMAAAAAAoC7AAAAAAAAgLUBAAAAAAC4AQN2b3JiaXMNAAAATGF2ZjU4Ljc2LjEwMAgAAAAMAAAAbGFuZ3VhZ2U9dW5kGQAAAGhhbmRsZXJfbmFtZT1Tb3VuZEhhbmRsZXIWAAAAdmVuZG9yX2lkPVswXVswXVswXVswXSAAAABlbmNvZGVyPUxhdmM1OC4xMzQuMTAwIGxpYnZvcmJpcxAAAABtYWpvcl9icmFuZD1pc29tEQAAAG1pbm9yX3ZlcnNpb249NTEyIgAAAGNvbXBhdGlibGVfYnJhbmRzPWlzb21pc28yYXZjMW1wNDEmAAAAREVTQ1JJUFRJT049TWFkZSB3aXRoIFJlbW90aW9uIDQuMC4yNzgBBXZvcmJpcyVCQ1YBAEAAACRzGCpGpXMWhBAaQlAZ4xxCzmvsGUJMEYIcMkxbyyVzkCGkoEKIWyiB0JBVAABAAACHQXgUhIpBCCGEJT1YkoMnPQghhIg5eBSEaUEIIYQQQgghhBBCCCGERTlokoMnQQgdhOMwOAyD5Tj4HIRFOVgQgydB6CCED0K4moOsOQghhCQ1SFCDBjnoHITCLCiKgsQwuBaEBDUojILkMMjUgwtCiJqDSTX4GoRnQXgWhGlBCCGEJEFIkIMGQcgYhEZBWJKDBjm4FITLQagahCo5CB+EIDRkFQCQAACgoiiKoigKEBqyCgDIAAAQQFEUx3EcyZEcybEcCwgNWQUAAAEACAAAoEiKpEiO5EiSJFmSJVmSJVmS5omqLMuyLMuyLMsyEBqyCgBIAABQUQxFcRQHCA1ZBQBkAAAIoDiKpViKpWiK54iOCISGrAIAgAAABAAAEDRDUzxHlETPVFXXtm3btm3btm3btm3btm1blmUZCA1ZBQBAAAAQ0mlmqQaIMAMZBkJDVgEACAAAgBGKMMSA0JBVAABAAACAGEoOogmtOd+c46BZDppKsTkdnEi1eZKbirk555xzzsnmnDHOOeecopxZDJoJrTnnnMSgWQqaCa0555wnsXnQmiqtOeeccc7pYJwRxjnnnCateZCajbU555wFrWmOmkuxOeecSLl5UptLtTnnnHPOOeecc84555zqxekcnBPOOeecqL25lpvQxTnnnE/G6d6cEM4555xzzjnnnHPOOeecIDRkFQAABABAEIaNYdwpCNLnaCBGEWIaMulB9+gwCRqDnELq0ehopJQ6CCWVcVJKJwgNWQUAAAIAQAghhRRSSCGFFFJIIYUUYoghhhhyyimnoIJKKqmooowyyyyzzDLLLLPMOuyssw47DDHEEEMrrcRSU2011lhr7jnnmoO0VlprrbVSSimllFIKQkNWAQAgAAAEQgYZZJBRSCGFFGKIKaeccgoqqIDQkFUAACAAgAAAAABP8hzRER3RER3RER3RER3R8RzPESVREiVREi3TMjXTU0VVdWXXlnVZt31b2IVd933d933d+HVhWJZlWZZlWZZlWZZlWZZlWZYgNGQVAAACAAAghBBCSCGFFFJIKcYYc8w56CSUEAgNWQUAAAIACAAAAHAUR3EcyZEcSbIkS9IkzdIsT/M0TxM9URRF0zRV0RVdUTdtUTZl0zVdUzZdVVZtV5ZtW7Z125dl2/d93/d93/d93/d93/d9XQdCQ1YBABIAADqSIymSIimS4ziOJElAaMgqAEAGAEAAAIriKI7jOJIkSZIlaZJneZaomZrpmZ4qqkBoyCoAABAAQAAAAAAAAIqmeIqpeIqoeI7oiJJomZaoqZoryqbsuq7ruq7ruq7ruq7ruq7ruq7ruq7ruq7ruq7ruq7ruq7ruq4LhIasAgAkAAB0JEdyJEdSJEVSJEdygNCQVQCADACAAAAcwzEkRXIsy9I0T/M0TxM90RM901NFV3SB0JBVAAAgAIAAAAAAAAAMybAUy9EcTRIl1VItVVMt1VJF1VNVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVN0zRNEwgNWQkAkAEAkBBTLS3GmgmLJGLSaqugYwxS7KWxSCpntbfKMYUYtV4ah5RREHupJGOKQcwtpNApJq3WVEKFFKSYYyoVUg5SIDRkhQAQmgHgcBxAsixAsiwAAAAAAAAAkDQN0DwPsDQPAAAAAAAAACRNAyxPAzTPAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABA0jRA8zxA8zwAAAAAAAAA0DwP8DwR8EQRAAAAAAAAACzPAzTRAzxRBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABA0jRA8zxA8zwAAAAAAAAAsDwP8EQR0DwRAAAAAAAAACzPAzxRBDzRAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAEOAAABBgIRQasiIAiBMAcEgSJAmSBM0DSJYFTYOmwTQBkmVB06BpME0AAAAAAAAAAAAAJE2DpkHTIIoASdOgadA0iCIAAAAAAAAAAAAAkqZB06BpEEWApGnQNGgaRBEAAAAAAAAAAAAAzzQhihBFmCbAM02IIkQRpgkAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAAAGHAAAAgwoQwUGrIiAIgTAHA4imUBAIDjOJYFAACO41gWAABYliWKAABgWZooAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIAAAYcAAACDChDBQashIAiAIAcCiKZQHHsSzgOJYFJMmyAJYF0DyApgFEEQAIAAAocAAACLBBU2JxgEJDVgIAUQAABsWxLE0TRZKkaZoniiRJ0zxPFGma53meacLzPM80IYqiaJoQRVE0TZimaaoqME1VFQAAUOAAABBgg6bE4gCFhqwEAEICAByKYlma5nmeJ4qmqZokSdM8TxRF0TRNU1VJkqZ5niiKommapqqyLE3zPFEURdNUVVWFpnmeKIqiaaqq6sLzPE8URdE0VdV14XmeJ4qiaJqq6roQRVE0TdNUTVV1XSCKpmmaqqqqrgtETxRNU1Vd13WB54miaaqqq7ouEE3TVFVVdV1ZBpimaaqq68oyQFVV1XVdV5YBqqqqruu6sgxQVdd1XVmWZQCu67qyLMsCAAAOHAAAAoygk4wqi7DRhAsPQKEhKwKAKAAAwBimFFPKMCYhpBAaxiSEFEImJaXSUqogpFJSKRWEVEoqJaOUUmopVRBSKamUCkIqJZVSAADYgQMA2IGFUGjISgAgDwCAMEYpxhhzTiKkFGPOOScRUoox55yTSjHmnHPOSSkZc8w556SUzjnnnHNSSuacc845KaVzzjnnnJRSSuecc05KKSWEzkEnpZTSOeecEwAAVOAAABBgo8jmBCNBhYasBABSAQAMjmNZmuZ5omialiRpmud5niiapiZJmuZ5nieKqsnzPE8URdE0VZXneZ4oiqJpqirXFUXTNE1VVV2yLIqmaZqq6rowTdNUVdd1XZimaaqq67oubFtVVdV1ZRm2raqq6rqyDFzXdWXZloEsu67s2rIAAPAEBwCgAhtWRzgpGgssNGQlAJABAEAYg5BCCCFlEEIKIYSUUggJAAAYcAAACDChDBQashIASAUAAIyx1lprrbXWQGettdZaa62AzFprrbXWWmuttdZaa6211lJrrbXWWmuttdZaa6211lprrbXWWmuttdZaa6211lprrbXWWmuttdZaa6211lprrbXWWmstpZRSSimllFJKKaWUUkoppZRSSgUA+lU4APg/2LA6wknRWGChISsBgHAAAMAYpRhzDEIppVQIMeacdFRai7FCiDHnJKTUWmzFc85BKCGV1mIsnnMOQikpxVZjUSmEUlJKLbZYi0qho5JSSq3VWIwxqaTWWoutxmKMSSm01FqLMRYjbE2ptdhqq7EYY2sqLbQYY4zFCF9kbC2m2moNxggjWywt1VprMMYY3VuLpbaaizE++NpSLDHWXAAAd4MDAESCjTOsJJ0VjgYXGrISAAgJACAQUooxxhhzzjnnpFKMOeaccw5CCKFUijHGnHMOQgghlIwx5pxzEEIIIYRSSsaccxBCCCGEkFLqnHMQQgghhBBKKZ1zDkIIIYQQQimlgxBCCCGEEEoopaQUQgghhBBCCKmklEIIIYRSQighlZRSCCGEEEIpJaSUUgohhFJCCKGElFJKKYUQQgillJJSSimlEkoJJYQSUikppRRKCCGUUkpKKaVUSgmhhBJKKSWllFJKIYQQSikFAAAcOAAABBhBJxlVFmGjCRcegEJDVgIAZAAAkKKUUiktRYIipRikGEtGFXNQWoqocgxSzalSziDmJJaIMYSUk1Qy5hRCDELqHHVMKQYtlRhCxhik2HJLoXMOAAAAQQCAgJAAAAMEBTMAwOAA4XMQdAIERxsAgCBEZohEw0JweFAJEBFTAUBigkIuAFRYXKRdXECXAS7o4q4DIQQhCEEsDqCABByccMMTb3jCDU7QKSp1IAAAAAAADADwAACQXAAREdHMYWRobHB0eHyAhIiMkAgAAAAAABcAfAAAJCVAREQ0cxgZGhscHR4fICEiIyQBAIAAAgAAAAAggAAEBAQAAAAAAAIAAAAEBA==");
          const view2 = toDataView(referenceDescription);
          view2.setUint8(15, decoderConfig.numberOfChannels);
          view2.setUint32(16, decoderConfig.sampleRate, true);
          return referenceDescription;
        }
        ;
      default:
        return void 0;
    }
  };
  var OPUS_SAMPLE_RATE = 48e3;
  var PCM_CODEC_REGEX = /^pcm-([usf])(\d+)(be)?$/;
  var parsePcmCodec = (codec) => {
    assert(PCM_AUDIO_CODECS.includes(codec));
    if (codec === "ulaw") {
      return { dataType: "ulaw", sampleSize: 1, littleEndian: true, silentValue: 255 };
    } else if (codec === "alaw") {
      return { dataType: "alaw", sampleSize: 1, littleEndian: true, silentValue: 213 };
    }
    const match = PCM_CODEC_REGEX.exec(codec);
    assert(match);
    let dataType;
    if (match[1] === "u") {
      dataType = "unsigned";
    } else if (match[1] === "s") {
      dataType = "signed";
    } else {
      dataType = "float";
    }
    const sampleSize = Number(match[2]) / 8;
    const littleEndian = match[3] !== "be";
    const silentValue = codec === "pcm-u8" ? 2 ** 7 : 0;
    return { dataType, sampleSize, littleEndian, silentValue };
  };
  var inferCodecFromCodecString = (codecString) => {
    if (codecString.startsWith("avc1") || codecString.startsWith("avc3")) {
      return "avc";
    } else if (codecString.startsWith("hev1") || codecString.startsWith("hvc1")) {
      return "hevc";
    } else if (codecString === "vp8") {
      return "vp8";
    } else if (codecString.startsWith("vp09")) {
      return "vp9";
    } else if (codecString.startsWith("av01")) {
      return "av1";
    } else if (PRORES_FOURCCS.includes(codecString)) {
      return "prores";
    }
    if (codecString === "mp3" || codecString === "mp4a.69" || codecString === "mp4a.6B" || codecString === "mp4a.6b" || codecString === "mp4a.40.34") {
      return "mp3";
    } else if (codecString.startsWith("mp4a.40.") || codecString === "mp4a.67") {
      return "aac";
    } else if (codecString === "opus") {
      return "opus";
    } else if (codecString === "vorbis") {
      return "vorbis";
    } else if (codecString === "flac") {
      return "flac";
    } else if (codecString === "ac-3" || codecString === "ac3") {
      return "ac3";
    } else if (codecString === "ec-3" || codecString === "eac3") {
      return "eac3";
    } else if (codecString === "ulaw") {
      return "ulaw";
    } else if (codecString === "alaw") {
      return "alaw";
    } else if (PCM_CODEC_REGEX.test(codecString)) {
      return codecString;
    }
    if (codecString === "webvtt") {
      return "webvtt";
    }
    return null;
  };
  var getVideoEncoderConfigExtension = (codec) => {
    if (codec === "avc") {
      return {
        avc: {
          format: "avc"
          // Ensure the format is not Annex B
        }
      };
    } else if (codec === "hevc") {
      return {
        hevc: {
          format: "hevc"
          // Ensure the format is not Annex B
        }
      };
    }
    return {};
  };
  var getAudioEncoderConfigExtension = (codec) => {
    if (codec === "aac") {
      return {
        aac: {
          format: "aac"
          // Ensure the format is not ADTS
        }
      };
    } else if (codec === "opus") {
      return {
        opus: {
          format: "opus"
        }
      };
    }
    return {};
  };
  var VALID_VIDEO_CODEC_STRING_PREFIXES = ["avc1", "avc3", "hev1", "hvc1", "vp8", "vp09", "av01", ...PRORES_FOURCCS];
  var AVC_CODEC_STRING_REGEX = /^(avc1|avc3)\.[0-9a-fA-F]{6}$/;
  var HEVC_CODEC_STRING_REGEX = /^(hev1|hvc1)\.(?:[ABC]?\d+)\.[0-9a-fA-F]{1,8}\.[LH]\d+(?:\.[0-9a-fA-F]{1,2}){0,6}$/;
  var VP9_CODEC_STRING_REGEX = /^vp09(?:\.\d{2}){3}(?:(?:\.\d{2}){5})?$/;
  var AV1_CODEC_STRING_REGEX = /^av01\.\d\.\d{2}[MH]\.\d{2}(?:\.\d\.\d{3}\.\d{2}\.\d{2}\.\d{2}\.\d)?$/;
  var validateVideoChunkMetadata = (metadata, trackCodec) => {
    if (!metadata) {
      throw new TypeError("Video chunk metadata must be provided.");
    }
    if (typeof metadata !== "object") {
      throw new TypeError("Video chunk metadata must be an object.");
    }
    if (!metadata.decoderConfig) {
      throw new TypeError("Video chunk metadata must include a decoder configuration.");
    }
    if (typeof metadata.decoderConfig !== "object") {
      throw new TypeError("Video chunk metadata decoder configuration must be an object.");
    }
    if (typeof metadata.decoderConfig.codec !== "string") {
      throw new TypeError("Video chunk metadata decoder configuration must specify a codec string.");
    }
    if (!VALID_VIDEO_CODEC_STRING_PREFIXES.some((prefix) => metadata.decoderConfig.codec.startsWith(prefix))) {
      throw new TypeError(
        "Video chunk metadata decoder configuration codec string must be a valid video codec string as specified in the Mediabunny Codec Registry."
      );
    }
    if (!Number.isInteger(metadata.decoderConfig.codedWidth) || metadata.decoderConfig.codedWidth <= 0) {
      throw new TypeError(
        "Video chunk metadata decoder configuration must specify a valid codedWidth (positive integer)."
      );
    }
    if (!Number.isInteger(metadata.decoderConfig.codedHeight) || metadata.decoderConfig.codedHeight <= 0) {
      throw new TypeError(
        "Video chunk metadata decoder configuration must specify a valid codedHeight (positive integer)."
      );
    }
    if (metadata.decoderConfig.displayAspectWidth !== void 0 && (!Number.isInteger(metadata.decoderConfig.displayAspectWidth) || metadata.decoderConfig.displayAspectWidth <= 0)) {
      throw new TypeError(
        "Video chunk metadata decoder configuration displayAspectWidth, when defined, must be a positive integer."
      );
    }
    if (metadata.decoderConfig.displayAspectHeight !== void 0 && (!Number.isInteger(metadata.decoderConfig.displayAspectHeight) || metadata.decoderConfig.displayAspectHeight <= 0)) {
      throw new TypeError(
        "Video chunk metadata decoder configuration displayAspectHeight, when defined, must be a positive integer."
      );
    }
    if (metadata.decoderConfig.displayAspectWidth !== void 0 !== (metadata.decoderConfig.displayAspectHeight !== void 0)) {
      throw new TypeError(
        "Video chunk metadata decoder configuration must specify both displayAspectWidth and displayAspectHeight, or neither."
      );
    }
    if (metadata.decoderConfig.description !== void 0) {
      if (!isAllowSharedBufferSource(metadata.decoderConfig.description)) {
        throw new TypeError(
          "Video chunk metadata decoder configuration description, when defined, must be an ArrayBuffer or an ArrayBuffer view."
        );
      }
    }
    if (metadata.decoderConfig.colorSpace !== void 0) {
      const { colorSpace } = metadata.decoderConfig;
      if (typeof colorSpace !== "object") {
        throw new TypeError(
          "Video chunk metadata decoder configuration colorSpace, when provided, must be an object."
        );
      }
      const primariesValues = Object.keys(COLOR_PRIMARIES_MAP);
      if (colorSpace.primaries != null && !primariesValues.includes(colorSpace.primaries)) {
        throw new TypeError(
          `Video chunk metadata decoder configuration colorSpace primaries, when defined, must be one of ${primariesValues.join(", ")}.`
        );
      }
      const transferValues = Object.keys(TRANSFER_CHARACTERISTICS_MAP);
      if (colorSpace.transfer != null && !transferValues.includes(colorSpace.transfer)) {
        throw new TypeError(
          `Video chunk metadata decoder configuration colorSpace transfer, when defined, must be one of ${transferValues.join(", ")}.`
        );
      }
      const matrixValues = Object.keys(MATRIX_COEFFICIENTS_MAP);
      if (colorSpace.matrix != null && !matrixValues.includes(colorSpace.matrix)) {
        throw new TypeError(
          `Video chunk metadata decoder configuration colorSpace matrix, when defined, must be one of ${matrixValues.join(", ")}.`
        );
      }
      if (colorSpace.fullRange != null && typeof colorSpace.fullRange !== "boolean") {
        throw new TypeError(
          "Video chunk metadata decoder configuration colorSpace fullRange, when defined, must be a boolean."
        );
      }
    }
    if (metadata.decoderConfig.codec.startsWith("avc1") || metadata.decoderConfig.codec.startsWith("avc3")) {
      if (!AVC_CODEC_STRING_REGEX.test(metadata.decoderConfig.codec)) {
        throw new TypeError(
          "Video chunk metadata decoder configuration codec string for AVC must be a valid AVC codec string as specified in Section 3.4 of RFC 6381."
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("hev1") || metadata.decoderConfig.codec.startsWith("hvc1")) {
      if (!HEVC_CODEC_STRING_REGEX.test(metadata.decoderConfig.codec)) {
        throw new TypeError(
          "Video chunk metadata decoder configuration codec string for HEVC must be a valid HEVC codec string as specified in Section E.3 of ISO 14496-15."
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("vp8")) {
      if (metadata.decoderConfig.codec !== "vp8") {
        throw new TypeError('Video chunk metadata decoder configuration codec string for VP8 must be "vp8".');
      }
    } else if (metadata.decoderConfig.codec.startsWith("vp09")) {
      if (!VP9_CODEC_STRING_REGEX.test(metadata.decoderConfig.codec)) {
        throw new TypeError(
          'Video chunk metadata decoder configuration codec string for VP9 must be a valid VP9 codec string as specified in Section "Codecs Parameter String" of https://www.webmproject.org/vp9/mp4/.'
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("av01")) {
      if (!AV1_CODEC_STRING_REGEX.test(metadata.decoderConfig.codec)) {
        throw new TypeError(
          'Video chunk metadata decoder configuration codec string for AV1 must be a valid AV1 codec string as specified in Section "Codecs Parameter String" of https://aomediacodec.github.io/av1-isobmff/.'
        );
      }
    } else if (PRORES_FOURCCS.some((x) => metadata.decoderConfig.codec.startsWith(x))) {
      if (!PRORES_FOURCCS.some((x) => metadata.decoderConfig.codec === x)) {
        throw new TypeError(
          `Video chunk metadata decoder configuration codec string for ProRes must be one of the valid ProRes four-character codes: ${PRORES_FOURCCS.join(", ")}.`
        );
      }
    }
    if (trackCodec !== null && inferCodecFromCodecString(metadata.decoderConfig.codec) !== trackCodec) {
      throw new TypeError(
        `Video chunk metadata decoder configuration codec string '${metadata.decoderConfig.codec}' does not fit to the track codec '${trackCodec}'.`
      );
    }
  };
  var VALID_AUDIO_CODEC_STRING_PREFIXES = [
    "mp4a",
    "mp3",
    "opus",
    "vorbis",
    "flac",
    "ulaw",
    "alaw",
    "pcm",
    "ac-3",
    "ec-3"
  ];
  var validateAudioChunkMetadata = (metadata, trackCodec) => {
    if (!metadata) {
      throw new TypeError("Audio chunk metadata must be provided.");
    }
    if (typeof metadata !== "object") {
      throw new TypeError("Audio chunk metadata must be an object.");
    }
    if (!metadata.decoderConfig) {
      throw new TypeError("Audio chunk metadata must include a decoder configuration.");
    }
    if (typeof metadata.decoderConfig !== "object") {
      throw new TypeError("Audio chunk metadata decoder configuration must be an object.");
    }
    if (typeof metadata.decoderConfig.codec !== "string") {
      throw new TypeError("Audio chunk metadata decoder configuration must specify a codec string.");
    }
    if (!VALID_AUDIO_CODEC_STRING_PREFIXES.some((prefix) => metadata.decoderConfig.codec.startsWith(prefix))) {
      throw new TypeError(
        "Audio chunk metadata decoder configuration codec string must be a valid audio codec string as specified in the Mediabunny Codec Registry."
      );
    }
    if (!Number.isInteger(metadata.decoderConfig.sampleRate) || metadata.decoderConfig.sampleRate <= 0) {
      throw new TypeError(
        "Audio chunk metadata decoder configuration must specify a valid sampleRate (positive integer)."
      );
    }
    if (!Number.isInteger(metadata.decoderConfig.numberOfChannels) || metadata.decoderConfig.numberOfChannels <= 0) {
      throw new TypeError(
        "Audio chunk metadata decoder configuration must specify a valid numberOfChannels (positive integer)."
      );
    }
    if (metadata.decoderConfig.description !== void 0) {
      if (!isAllowSharedBufferSource(metadata.decoderConfig.description)) {
        throw new TypeError(
          "Audio chunk metadata decoder configuration description, when defined, must be an ArrayBuffer or an ArrayBuffer view."
        );
      }
    }
    if (metadata.decoderConfig.codec.startsWith("mp4a") && metadata.decoderConfig.codec !== "mp4a.69" && metadata.decoderConfig.codec !== "mp4a.6B" && metadata.decoderConfig.codec !== "mp4a.6b") {
      const validStrings = ["mp4a.40.2", "mp4a.40.02", "mp4a.40.5", "mp4a.40.05", "mp4a.40.29", "mp4a.67"];
      if (!validStrings.includes(metadata.decoderConfig.codec)) {
        throw new TypeError(
          "Audio chunk metadata decoder configuration codec string for AAC must be a valid AAC codec string as specified in https://www.w3.org/TR/webcodecs-aac-codec-registration/."
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("mp3") || metadata.decoderConfig.codec.startsWith("mp4a")) {
      if (metadata.decoderConfig.codec !== "mp3" && metadata.decoderConfig.codec !== "mp4a.69" && metadata.decoderConfig.codec !== "mp4a.6B" && metadata.decoderConfig.codec !== "mp4a.6b") {
        throw new TypeError(
          'Audio chunk metadata decoder configuration codec string for MP3 must be "mp3", "mp4a.69" or "mp4a.6B".'
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("opus")) {
      if (metadata.decoderConfig.codec !== "opus") {
        throw new TypeError('Audio chunk metadata decoder configuration codec string for Opus must be "opus".');
      }
      if (metadata.decoderConfig.description && metadata.decoderConfig.description.byteLength < 18) {
        throw new TypeError(
          "Audio chunk metadata decoder configuration description, when specified, is expected to be an Identification Header as specified in Section 5.1 of RFC 7845."
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("vorbis")) {
      if (metadata.decoderConfig.codec !== "vorbis") {
        throw new TypeError('Audio chunk metadata decoder configuration codec string for Vorbis must be "vorbis".');
      }
      if (!metadata.decoderConfig.description) {
        throw new TypeError(
          "Audio chunk metadata decoder configuration for Vorbis must include a description, which is expected to adhere to the format described in https://www.w3.org/TR/webcodecs-vorbis-codec-registration/."
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("flac")) {
      if (metadata.decoderConfig.codec !== "flac") {
        throw new TypeError('Audio chunk metadata decoder configuration codec string for FLAC must be "flac".');
      }
      const minDescriptionSize = 4 + 4 + 34;
      if (!metadata.decoderConfig.description || metadata.decoderConfig.description.byteLength < minDescriptionSize) {
        throw new TypeError(
          "Audio chunk metadata decoder configuration for FLAC must include a description, which is expected to adhere to the format described in https://www.w3.org/TR/webcodecs-flac-codec-registration/."
        );
      }
    } else if (metadata.decoderConfig.codec.startsWith("ac-3") || metadata.decoderConfig.codec.startsWith("ac3")) {
      if (metadata.decoderConfig.codec !== "ac-3") {
        throw new TypeError('Audio chunk metadata decoder configuration codec string for AC-3 must be "ac-3".');
      }
    } else if (metadata.decoderConfig.codec.startsWith("ec-3") || metadata.decoderConfig.codec.startsWith("eac3")) {
      if (metadata.decoderConfig.codec !== "ec-3") {
        throw new TypeError('Audio chunk metadata decoder configuration codec string for EC-3 must be "ec-3".');
      }
    } else if (metadata.decoderConfig.codec.startsWith("pcm") || metadata.decoderConfig.codec.startsWith("ulaw") || metadata.decoderConfig.codec.startsWith("alaw")) {
      if (!PCM_AUDIO_CODECS.includes(metadata.decoderConfig.codec)) {
        throw new TypeError(
          `Audio chunk metadata decoder configuration codec string for PCM must be one of the supported PCM codecs (${PCM_AUDIO_CODECS.join(", ")}).`
        );
      }
    }
    if (trackCodec !== null && inferCodecFromCodecString(metadata.decoderConfig.codec) !== trackCodec) {
      throw new TypeError(
        `Audio chunk metadata decoder configuration codec string '${metadata.decoderConfig.codec}' does not fit to the track codec '${trackCodec}'.`
      );
    }
  };
  var validateSubtitleMetadata = (metadata) => {
    if (!metadata) {
      throw new TypeError("Subtitle metadata must be provided.");
    }
    if (typeof metadata !== "object") {
      throw new TypeError("Subtitle metadata must be an object.");
    }
    if (!metadata.config) {
      throw new TypeError("Subtitle metadata must include a config object.");
    }
    if (typeof metadata.config !== "object") {
      throw new TypeError("Subtitle metadata config must be an object.");
    }
    if (typeof metadata.config.description !== "string") {
      throw new TypeError("Subtitle metadata config description must be a string.");
    }
  };

  // shared/mp3-misc.ts
  var MP3_FRAME_HEADER_SIZE = 4;
  var SAMPLING_RATES = [44100, 48e3, 32e3];
  var KILOBIT_RATES = [
    // lowSamplingFrequency === 0
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    // layer = 0
    -1,
    32,
    40,
    48,
    56,
    64,
    80,
    96,
    112,
    128,
    160,
    192,
    224,
    256,
    320,
    -1,
    // layer 1
    -1,
    32,
    48,
    56,
    64,
    80,
    96,
    112,
    128,
    160,
    192,
    224,
    256,
    320,
    384,
    -1,
    // layer = 2
    -1,
    32,
    64,
    96,
    128,
    160,
    192,
    224,
    256,
    288,
    320,
    352,
    384,
    416,
    448,
    -1,
    // layer = 3
    // lowSamplingFrequency === 1
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    -1,
    // layer = 0
    -1,
    8,
    16,
    24,
    32,
    40,
    48,
    56,
    64,
    80,
    96,
    112,
    128,
    144,
    160,
    -1,
    // layer = 1
    -1,
    8,
    16,
    24,
    32,
    40,
    48,
    56,
    64,
    80,
    96,
    112,
    128,
    144,
    160,
    -1,
    // layer = 2
    -1,
    32,
    48,
    56,
    64,
    80,
    96,
    112,
    128,
    144,
    160,
    176,
    192,
    224,
    256,
    -1
    // layer = 3
  ];
  var XING = 1483304551;
  var INFO = 1231971951;
  var computeMp3FrameSize = (lowSamplingFrequency, layer, bitrate, sampleRate, padding) => {
    if (layer === 0) {
      return 0;
    } else if (layer === 1) {
      return Math.floor(144 * bitrate / (sampleRate << lowSamplingFrequency)) + padding;
    } else if (layer === 2) {
      return Math.floor(144 * bitrate / sampleRate) + padding;
    } else {
      return (Math.floor(12 * bitrate / sampleRate) + padding) * 4;
    }
  };
  var computeAverageMp3FrameSize = (lowSamplingFrequency, layer, bitrate, sampleRate) => {
    if (layer === 0) {
      return 0;
    } else if (layer === 1) {
      return 144 * bitrate / (sampleRate << lowSamplingFrequency);
    } else if (layer === 2) {
      return 144 * bitrate / sampleRate;
    } else {
      return 12 * bitrate / sampleRate * 4;
    }
  };
  var getXingOffset = (mpegVersionId, channel) => {
    return mpegVersionId === 3 ? channel === 3 ? 21 : 36 : channel === 3 ? 13 : 21;
  };
  var readMp3FrameHeader = (word, remainingBytes) => {
    const firstByte = word >>> 24;
    const secondByte = word >>> 16 & 255;
    const thirdByte = word >>> 8 & 255;
    const fourthByte = word & 255;
    if (firstByte !== 255 && secondByte !== 255 && thirdByte !== 255 && fourthByte !== 255) {
      return {
        header: null,
        bytesAdvanced: 4
      };
    }
    if (firstByte !== 255) {
      return { header: null, bytesAdvanced: 1 };
    }
    if ((secondByte & 224) !== 224) {
      return { header: null, bytesAdvanced: 1 };
    }
    let lowSamplingFrequency = 0;
    let mpeg25 = 0;
    if (secondByte & 1 << 4) {
      lowSamplingFrequency = secondByte & 1 << 3 ? 0 : 1;
    } else {
      lowSamplingFrequency = 1;
      mpeg25 = 1;
    }
    const mpegVersionId = secondByte >> 3 & 3;
    const layer = secondByte >> 1 & 3;
    const bitrateIndex = thirdByte >> 4 & 15;
    const frequencyIndex = (thirdByte >> 2 & 3) % 3;
    const padding = thirdByte >> 1 & 1;
    const channel = fourthByte >> 6 & 3;
    const modeExtension = fourthByte >> 4 & 3;
    const copyright = fourthByte >> 3 & 1;
    const original = fourthByte >> 2 & 1;
    const emphasis = fourthByte & 3;
    const kilobitRate = KILOBIT_RATES[lowSamplingFrequency * 16 * 4 + layer * 16 + bitrateIndex];
    if (kilobitRate === -1) {
      return { header: null, bytesAdvanced: 1 };
    }
    const bitrate = kilobitRate * 1e3;
    const sampleRate = SAMPLING_RATES[frequencyIndex] >> lowSamplingFrequency + mpeg25;
    const frameLength = computeMp3FrameSize(lowSamplingFrequency, layer, bitrate, sampleRate, padding);
    if (remainingBytes !== null && remainingBytes < frameLength) {
      return { header: null, bytesAdvanced: 1 };
    }
    let audioSamplesInFrame;
    if (mpegVersionId === 3) {
      audioSamplesInFrame = layer === 3 ? 384 : 1152;
    } else {
      if (layer === 3) {
        audioSamplesInFrame = 384;
      } else if (layer === 2) {
        audioSamplesInFrame = 1152;
      } else {
        audioSamplesInFrame = 576;
      }
    }
    return {
      header: {
        totalSize: frameLength,
        mpegVersionId,
        lowSamplingFrequency,
        layer,
        bitrate,
        frequencyIndex,
        sampleRate,
        channel,
        modeExtension,
        copyright,
        original,
        emphasis,
        audioSamplesInFrame
      },
      bytesAdvanced: 1
    };
  };
  var encodeSynchsafe = (unsynchsafed) => {
    let mask = 127;
    let synchsafed = 0;
    let unsynchsafedRest = unsynchsafed;
    while ((mask ^ 2147483647) !== 0) {
      synchsafed = unsynchsafedRest & ~mask;
      synchsafed <<= 1;
      synchsafed |= unsynchsafedRest & mask;
      mask = (mask + 1 << 8) - 1;
      unsynchsafedRest = synchsafed;
    }
    return synchsafed;
  };
  var decodeSynchsafe = (synchsafed) => {
    let mask = 2130706432;
    let unsynchsafed = 0;
    while (mask !== 0) {
      unsynchsafed >>= 1;
      unsynchsafed |= synchsafed & mask;
      mask >>= 8;
    }
    return unsynchsafed;
  };
  var getMp3ChannelCount = (channel) => {
    return channel === 3 ? 1 : 2;
  };

  // shared/ac3-misc.ts
  var AC3_SAMPLE_RATES = [48e3, 44100, 32e3];
  var EAC3_REDUCED_SAMPLE_RATES = [24e3, 22050, 16e3];

  // src/codec-data.ts
  var iterateNalUnitsInAnnexB = function* (packetData) {
    let i = 0;
    let nalStart = -1;
    while (i < packetData.length - 2) {
      const zeroIndex = packetData.indexOf(0, i);
      if (zeroIndex === -1 || zeroIndex >= packetData.length - 2) {
        break;
      }
      i = zeroIndex;
      let startCodeLength = 0;
      if (i + 3 < packetData.length && packetData[i + 1] === 0 && packetData[i + 2] === 0 && packetData[i + 3] === 1) {
        startCodeLength = 4;
      } else if (packetData[i + 1] === 0 && packetData[i + 2] === 1) {
        startCodeLength = 3;
      }
      if (startCodeLength === 0) {
        i++;
        continue;
      }
      if (nalStart !== -1 && i > nalStart) {
        yield {
          offset: nalStart,
          length: i - nalStart
        };
      }
      nalStart = i + startCodeLength;
      i = nalStart;
    }
    if (nalStart !== -1 && nalStart < packetData.length) {
      yield {
        offset: nalStart,
        length: packetData.length - nalStart
      };
    }
  };
  var iterateNalUnitsInLengthPrefixed = function* (packetData, lengthSize) {
    let offset = 0;
    const dataView = new DataView(packetData.buffer, packetData.byteOffset, packetData.byteLength);
    while (offset + lengthSize <= packetData.length) {
      let nalUnitLength;
      if (lengthSize === 1) {
        nalUnitLength = dataView.getUint8(offset);
      } else if (lengthSize === 2) {
        nalUnitLength = dataView.getUint16(offset, false);
      } else if (lengthSize === 3) {
        nalUnitLength = getUint24(dataView, offset, false);
      } else {
        assert(lengthSize === 4);
        nalUnitLength = dataView.getUint32(offset, false);
      }
      offset += lengthSize;
      yield {
        offset,
        length: nalUnitLength
      };
      offset += nalUnitLength;
    }
  };
  var iterateAvcNalUnits = (packetData, decoderConfig) => {
    if (decoderConfig.description) {
      const bytes2 = toUint8Array(decoderConfig.description);
      const lengthSizeMinusOne = bytes2[4] & 3;
      const lengthSize = lengthSizeMinusOne + 1;
      return iterateNalUnitsInLengthPrefixed(packetData, lengthSize);
    } else {
      return iterateNalUnitsInAnnexB(packetData);
    }
  };
  var extractNalUnitTypeForAvc = (byte) => {
    return byte & 31;
  };
  var removeEmulationPreventionBytes = (data) => {
    const result = [];
    const len = data.length;
    for (let i = 0; i < len; i++) {
      if (i + 2 < len && data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 3) {
        result.push(0, 0);
        i += 2;
      } else {
        result.push(data[i]);
      }
    }
    return new Uint8Array(result);
  };
  var ANNEX_B_START_CODE = new Uint8Array([0, 0, 0, 1]);
  var concatNalUnitsInAnnexB = (nalUnits) => {
    const totalLength = nalUnits.reduce((a, b) => a + ANNEX_B_START_CODE.byteLength + b.byteLength, 0);
    const result = new Uint8Array(totalLength);
    let offset = 0;
    for (const nalUnit of nalUnits) {
      result.set(ANNEX_B_START_CODE, offset);
      offset += ANNEX_B_START_CODE.byteLength;
      result.set(nalUnit, offset);
      offset += nalUnit.byteLength;
    }
    return result;
  };
  var concatNalUnitsInLengthPrefixed = (nalUnits, lengthSize) => {
    const totalLength = nalUnits.reduce((a, b) => a + lengthSize + b.byteLength, 0);
    const result = new Uint8Array(totalLength);
    let offset = 0;
    for (const nalUnit of nalUnits) {
      const dataView = new DataView(result.buffer, result.byteOffset, result.byteLength);
      switch (lengthSize) {
        case 1:
          dataView.setUint8(offset, nalUnit.byteLength);
          break;
        case 2:
          dataView.setUint16(offset, nalUnit.byteLength, false);
          break;
        case 3:
          setUint24(dataView, offset, nalUnit.byteLength, false);
          break;
        case 4:
          dataView.setUint32(offset, nalUnit.byteLength, false);
          break;
      }
      offset += lengthSize;
      result.set(nalUnit, offset);
      offset += nalUnit.byteLength;
    }
    return result;
  };
  var concatAvcNalUnits = (nalUnits, decoderConfig) => {
    if (decoderConfig.description) {
      const bytes2 = toUint8Array(decoderConfig.description);
      const lengthSizeMinusOne = bytes2[4] & 3;
      const lengthSize = lengthSizeMinusOne + 1;
      return concatNalUnitsInLengthPrefixed(nalUnits, lengthSize);
    } else {
      return concatNalUnitsInAnnexB(nalUnits);
    }
  };
  var extractAvcDecoderConfigurationRecord = (packetData) => {
    try {
      const spsUnits = [];
      const ppsUnits = [];
      const spsExtUnits = [];
      for (const loc of iterateNalUnitsInAnnexB(packetData)) {
        const nalUnit = packetData.subarray(loc.offset, loc.offset + loc.length);
        const type = extractNalUnitTypeForAvc(nalUnit[0]);
        if (type === 7 /* SPS */) {
          spsUnits.push(nalUnit);
        } else if (type === 8 /* PPS */) {
          ppsUnits.push(nalUnit);
        } else if (type === 13 /* SPS_EXT */) {
          spsExtUnits.push(nalUnit);
        }
      }
      if (spsUnits.length === 0) {
        return null;
      }
      if (ppsUnits.length === 0) {
        return null;
      }
      const spsData = spsUnits[0];
      const spsInfo = parseAvcSps(spsData);
      assert(spsInfo !== null);
      const hasExtendedData = spsInfo.profileIdc === 100 || spsInfo.profileIdc === 110 || spsInfo.profileIdc === 122 || spsInfo.profileIdc === 144;
      return {
        configurationVersion: 1,
        avcProfileIndication: spsInfo.profileIdc,
        profileCompatibility: spsInfo.constraintFlags,
        avcLevelIndication: spsInfo.levelIdc,
        lengthSizeMinusOne: 3,
        // Typically 4 bytes for length field
        sequenceParameterSets: spsUnits,
        pictureParameterSets: ppsUnits,
        chromaFormat: hasExtendedData ? spsInfo.chromaFormatIdc : null,
        bitDepthLumaMinus8: hasExtendedData ? spsInfo.bitDepthLumaMinus8 : null,
        bitDepthChromaMinus8: hasExtendedData ? spsInfo.bitDepthChromaMinus8 : null,
        sequenceParameterSetExt: hasExtendedData ? spsExtUnits : null
      };
    } catch (error) {
      Logging._error("Error building AVC Decoder Configuration Record:", error);
      return null;
    }
  };
  var serializeAvcDecoderConfigurationRecord = (record) => {
    const bytes2 = [];
    bytes2.push(record.configurationVersion);
    bytes2.push(record.avcProfileIndication);
    bytes2.push(record.profileCompatibility);
    bytes2.push(record.avcLevelIndication);
    bytes2.push(252 | record.lengthSizeMinusOne & 3);
    bytes2.push(224 | record.sequenceParameterSets.length & 31);
    for (const sps of record.sequenceParameterSets) {
      const length = sps.byteLength;
      bytes2.push(length >> 8);
      bytes2.push(length & 255);
      for (let i = 0; i < length; i++) {
        bytes2.push(sps[i]);
      }
    }
    bytes2.push(record.pictureParameterSets.length);
    for (const pps of record.pictureParameterSets) {
      const length = pps.byteLength;
      bytes2.push(length >> 8);
      bytes2.push(length & 255);
      for (let i = 0; i < length; i++) {
        bytes2.push(pps[i]);
      }
    }
    if (record.avcProfileIndication === 100 || record.avcProfileIndication === 110 || record.avcProfileIndication === 122 || record.avcProfileIndication === 144) {
      assert(record.chromaFormat !== null);
      assert(record.bitDepthLumaMinus8 !== null);
      assert(record.bitDepthChromaMinus8 !== null);
      assert(record.sequenceParameterSetExt !== null);
      bytes2.push(252 | record.chromaFormat & 3);
      bytes2.push(248 | record.bitDepthLumaMinus8 & 7);
      bytes2.push(248 | record.bitDepthChromaMinus8 & 7);
      bytes2.push(record.sequenceParameterSetExt.length);
      for (const spsExt of record.sequenceParameterSetExt) {
        const length = spsExt.byteLength;
        bytes2.push(length >> 8);
        bytes2.push(length & 255);
        for (let i = 0; i < length; i++) {
          bytes2.push(spsExt[i]);
        }
      }
    }
    return new Uint8Array(bytes2);
  };
  var deserializeAvcDecoderConfigurationRecord = (data) => {
    try {
      const view2 = toDataView(data);
      let offset = 0;
      const configurationVersion = view2.getUint8(offset++);
      const avcProfileIndication = view2.getUint8(offset++);
      const profileCompatibility = view2.getUint8(offset++);
      const avcLevelIndication = view2.getUint8(offset++);
      const lengthSizeMinusOne = view2.getUint8(offset++) & 3;
      const numOfSequenceParameterSets = view2.getUint8(offset++) & 31;
      const sequenceParameterSets = [];
      for (let i = 0; i < numOfSequenceParameterSets; i++) {
        const length = view2.getUint16(offset, false);
        offset += 2;
        sequenceParameterSets.push(data.subarray(offset, offset + length));
        offset += length;
      }
      const numOfPictureParameterSets = view2.getUint8(offset++);
      const pictureParameterSets = [];
      for (let i = 0; i < numOfPictureParameterSets; i++) {
        const length = view2.getUint16(offset, false);
        offset += 2;
        pictureParameterSets.push(data.subarray(offset, offset + length));
        offset += length;
      }
      const record = {
        configurationVersion,
        avcProfileIndication,
        profileCompatibility,
        avcLevelIndication,
        lengthSizeMinusOne,
        sequenceParameterSets,
        pictureParameterSets,
        chromaFormat: null,
        bitDepthLumaMinus8: null,
        bitDepthChromaMinus8: null,
        sequenceParameterSetExt: null
      };
      if ((avcProfileIndication === 100 || avcProfileIndication === 110 || avcProfileIndication === 122 || avcProfileIndication === 144) && offset + 4 <= data.length) {
        const chromaFormat = view2.getUint8(offset++) & 3;
        const bitDepthLumaMinus8 = view2.getUint8(offset++) & 7;
        const bitDepthChromaMinus8 = view2.getUint8(offset++) & 7;
        const numOfSequenceParameterSetExt = view2.getUint8(offset++);
        record.chromaFormat = chromaFormat;
        record.bitDepthLumaMinus8 = bitDepthLumaMinus8;
        record.bitDepthChromaMinus8 = bitDepthChromaMinus8;
        const sequenceParameterSetExt = [];
        for (let i = 0; i < numOfSequenceParameterSetExt; i++) {
          const length = view2.getUint16(offset, false);
          offset += 2;
          sequenceParameterSetExt.push(data.subarray(offset, offset + length));
          offset += length;
        }
        record.sequenceParameterSetExt = sequenceParameterSetExt;
      }
      return record;
    } catch (error) {
      Logging._error("Error deserializing AVC Decoder Configuration Record:", error);
      return null;
    }
  };
  var AVC_HEVC_ASPECT_RATIO_IDC_TABLE = {
    1: { num: 1, den: 1 },
    2: { num: 12, den: 11 },
    3: { num: 10, den: 11 },
    4: { num: 16, den: 11 },
    5: { num: 40, den: 33 },
    6: { num: 24, den: 11 },
    7: { num: 20, den: 11 },
    8: { num: 32, den: 11 },
    9: { num: 80, den: 33 },
    10: { num: 18, den: 11 },
    11: { num: 15, den: 11 },
    12: { num: 64, den: 33 },
    13: { num: 160, den: 99 },
    14: { num: 4, den: 3 },
    15: { num: 3, den: 2 },
    16: { num: 2, den: 1 }
  };
  var parseAvcSps = (sps) => {
    try {
      const bitstream = new Bitstream(removeEmulationPreventionBytes(sps));
      bitstream.skipBits(1);
      bitstream.skipBits(2);
      const nalUnitType = bitstream.readBits(5);
      if (nalUnitType !== 7) {
        return null;
      }
      const profileIdc = bitstream.readAlignedByte();
      const constraintFlags = bitstream.readAlignedByte();
      const levelIdc = bitstream.readAlignedByte();
      readExpGolomb(bitstream);
      let chromaFormatIdc = 1;
      let bitDepthLumaMinus8 = 0;
      let bitDepthChromaMinus8 = 0;
      let separateColourPlaneFlag = 0;
      if (profileIdc === 100 || profileIdc === 110 || profileIdc === 122 || profileIdc === 244 || profileIdc === 44 || profileIdc === 83 || profileIdc === 86 || profileIdc === 118 || profileIdc === 128) {
        chromaFormatIdc = readExpGolomb(bitstream);
        if (chromaFormatIdc === 3) {
          separateColourPlaneFlag = bitstream.readBits(1);
        }
        bitDepthLumaMinus8 = readExpGolomb(bitstream);
        bitDepthChromaMinus8 = readExpGolomb(bitstream);
        bitstream.skipBits(1);
        const seqScalingMatrixPresentFlag = bitstream.readBits(1);
        if (seqScalingMatrixPresentFlag) {
          for (let i = 0; i < (chromaFormatIdc !== 3 ? 8 : 12); i++) {
            const seqScalingListPresentFlag = bitstream.readBits(1);
            if (seqScalingListPresentFlag) {
              const sizeOfScalingList = i < 6 ? 16 : 64;
              let lastScale = 8;
              let nextScale = 8;
              for (let j = 0; j < sizeOfScalingList; j++) {
                if (nextScale !== 0) {
                  const deltaScale = readSignedExpGolomb(bitstream);
                  nextScale = (lastScale + deltaScale + 256) % 256;
                }
                lastScale = nextScale === 0 ? lastScale : nextScale;
              }
            }
          }
        }
      }
      readExpGolomb(bitstream);
      const picOrderCntType = readExpGolomb(bitstream);
      if (picOrderCntType === 0) {
        readExpGolomb(bitstream);
      } else if (picOrderCntType === 1) {
        bitstream.skipBits(1);
        readSignedExpGolomb(bitstream);
        readSignedExpGolomb(bitstream);
        const numRefFramesInPicOrderCntCycle = readExpGolomb(bitstream);
        for (let i = 0; i < numRefFramesInPicOrderCntCycle; i++) {
          readSignedExpGolomb(bitstream);
        }
      }
      readExpGolomb(bitstream);
      bitstream.skipBits(1);
      const picWidthInMbsMinus1 = readExpGolomb(bitstream);
      const picHeightInMapUnitsMinus1 = readExpGolomb(bitstream);
      const codedWidth = 16 * (picWidthInMbsMinus1 + 1);
      const codedHeight = 16 * (picHeightInMapUnitsMinus1 + 1);
      let displayWidth = codedWidth;
      let displayHeight = codedHeight;
      const frameMbsOnlyFlag = bitstream.readBits(1);
      if (!frameMbsOnlyFlag) {
        bitstream.skipBits(1);
      }
      bitstream.skipBits(1);
      const frameCroppingFlag = bitstream.readBits(1);
      if (frameCroppingFlag) {
        const frameCropLeftOffset = readExpGolomb(bitstream);
        const frameCropRightOffset = readExpGolomb(bitstream);
        const frameCropTopOffset = readExpGolomb(bitstream);
        const frameCropBottomOffset = readExpGolomb(bitstream);
        let cropUnitX;
        let cropUnitY;
        const chromaArrayType = separateColourPlaneFlag === 0 ? chromaFormatIdc : 0;
        if (chromaArrayType === 0) {
          cropUnitX = 1;
          cropUnitY = 2 - frameMbsOnlyFlag;
        } else {
          const subWidthC = chromaFormatIdc === 3 ? 1 : 2;
          const subHeightC = chromaFormatIdc === 1 ? 2 : 1;
          cropUnitX = subWidthC;
          cropUnitY = subHeightC * (2 - frameMbsOnlyFlag);
        }
        displayWidth -= cropUnitX * (frameCropLeftOffset + frameCropRightOffset);
        displayHeight -= cropUnitY * (frameCropTopOffset + frameCropBottomOffset);
      }
      let colourPrimaries = 2;
      let transferCharacteristics = 2;
      let matrixCoefficients = 2;
      let fullRangeFlag = 0;
      let pixelAspectRatio = { num: 1, den: 1 };
      let numReorderFrames = null;
      let maxDecFrameBuffering = null;
      const vuiParametersPresentFlag = bitstream.readBits(1);
      if (vuiParametersPresentFlag) {
        const aspectRatioInfoPresentFlag = bitstream.readBits(1);
        if (aspectRatioInfoPresentFlag) {
          const aspectRatioIdc = bitstream.readBits(8);
          if (aspectRatioIdc === 255) {
            pixelAspectRatio = {
              num: bitstream.readBits(16),
              den: bitstream.readBits(16)
            };
          } else {
            const aspectRatio = AVC_HEVC_ASPECT_RATIO_IDC_TABLE[aspectRatioIdc];
            if (aspectRatio) {
              pixelAspectRatio = aspectRatio;
            }
          }
        }
        const overscanInfoPresentFlag = bitstream.readBits(1);
        if (overscanInfoPresentFlag) {
          bitstream.skipBits(1);
        }
        const videoSignalTypePresentFlag = bitstream.readBits(1);
        if (videoSignalTypePresentFlag) {
          bitstream.skipBits(3);
          fullRangeFlag = bitstream.readBits(1);
          const colourDescriptionPresentFlag = bitstream.readBits(1);
          if (colourDescriptionPresentFlag) {
            colourPrimaries = bitstream.readBits(8);
            transferCharacteristics = bitstream.readBits(8);
            matrixCoefficients = bitstream.readBits(8);
          }
        }
        const chromaLocInfoPresentFlag = bitstream.readBits(1);
        if (chromaLocInfoPresentFlag) {
          readExpGolomb(bitstream);
          readExpGolomb(bitstream);
        }
        const timingInfoPresentFlag = bitstream.readBits(1);
        if (timingInfoPresentFlag) {
          bitstream.skipBits(32);
          bitstream.skipBits(32);
          bitstream.skipBits(1);
        }
        const nalHrdParametersPresentFlag = bitstream.readBits(1);
        if (nalHrdParametersPresentFlag) {
          skipAvcHrdParameters(bitstream);
        }
        const vclHrdParametersPresentFlag = bitstream.readBits(1);
        if (vclHrdParametersPresentFlag) {
          skipAvcHrdParameters(bitstream);
        }
        if (nalHrdParametersPresentFlag || vclHrdParametersPresentFlag) {
          bitstream.skipBits(1);
        }
        bitstream.skipBits(1);
        const bitstreamRestrictionFlag = bitstream.readBits(1);
        if (bitstreamRestrictionFlag) {
          bitstream.skipBits(1);
          readExpGolomb(bitstream);
          readExpGolomb(bitstream);
          readExpGolomb(bitstream);
          readExpGolomb(bitstream);
          numReorderFrames = readExpGolomb(bitstream);
          maxDecFrameBuffering = readExpGolomb(bitstream);
        }
      }
      if (numReorderFrames === null) {
        assert(maxDecFrameBuffering === null);
        const constraintSet3Flag = constraintFlags & 16;
        if ((profileIdc === 44 || profileIdc === 86 || profileIdc === 100 || profileIdc === 110 || profileIdc === 122 || profileIdc === 244) && constraintSet3Flag) {
          numReorderFrames = 0;
          maxDecFrameBuffering = 0;
        } else {
          const picWidthInMbs = picWidthInMbsMinus1 + 1;
          const picHeightInMapUnits = picHeightInMapUnitsMinus1 + 1;
          const frameHeightInMbs = (2 - frameMbsOnlyFlag) * picHeightInMapUnits;
          const levelInfo = AVC_LEVEL_TABLE.find(
            (x) => x.level >= levelIdc
          ) ?? last(AVC_LEVEL_TABLE);
          const maxDpbFrames = Math.min(
            Math.floor(levelInfo.maxDpbMbs / (picWidthInMbs * frameHeightInMbs)),
            16
          );
          numReorderFrames = maxDpbFrames;
          maxDecFrameBuffering = maxDpbFrames;
        }
      }
      assert(maxDecFrameBuffering !== null);
      return {
        profileIdc,
        constraintFlags,
        levelIdc,
        frameMbsOnlyFlag,
        chromaFormatIdc,
        bitDepthLumaMinus8,
        bitDepthChromaMinus8,
        codedWidth,
        codedHeight,
        displayWidth,
        displayHeight,
        pixelAspectRatio,
        colourPrimaries,
        matrixCoefficients,
        transferCharacteristics,
        fullRangeFlag,
        numReorderFrames,
        maxDecFrameBuffering
      };
    } catch (error) {
      Logging._error("Error parsing AVC SPS:", error);
      return null;
    }
  };
  var skipAvcHrdParameters = (bitstream) => {
    const cpb_cnt_minus1 = readExpGolomb(bitstream);
    bitstream.skipBits(4);
    bitstream.skipBits(4);
    for (let i = 0; i <= cpb_cnt_minus1; i++) {
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      bitstream.skipBits(1);
    }
    bitstream.skipBits(5);
    bitstream.skipBits(5);
    bitstream.skipBits(5);
    bitstream.skipBits(5);
  };
  var concatHevcNalUnits = (nalUnits, decoderConfig) => {
    if (decoderConfig.description) {
      const bytes2 = toUint8Array(decoderConfig.description);
      const lengthSizeMinusOne = bytes2[21] & 3;
      const lengthSize = lengthSizeMinusOne + 1;
      return concatNalUnitsInLengthPrefixed(nalUnits, lengthSize);
    } else {
      return concatNalUnitsInAnnexB(nalUnits);
    }
  };
  var iterateHevcNalUnits = (packetData, decoderConfig) => {
    if (decoderConfig.description) {
      const bytes2 = toUint8Array(decoderConfig.description);
      const lengthSizeMinusOne = bytes2[21] & 3;
      const lengthSize = lengthSizeMinusOne + 1;
      return iterateNalUnitsInLengthPrefixed(packetData, lengthSize);
    } else {
      return iterateNalUnitsInAnnexB(packetData);
    }
  };
  var extractNalUnitTypeForHevc = (byte) => {
    return byte >> 1 & 63;
  };
  var parseHevcSps = (sps) => {
    try {
      const bitstream = new Bitstream(removeEmulationPreventionBytes(sps));
      bitstream.skipBits(16);
      bitstream.readBits(4);
      const spsMaxSubLayersMinus1 = bitstream.readBits(3);
      const spsTemporalIdNestingFlag = bitstream.readBits(1);
      const {
        general_profile_space,
        general_tier_flag,
        general_profile_idc,
        general_profile_compatibility_flags,
        general_constraint_indicator_flags,
        general_level_idc
      } = parseProfileTierLevel(bitstream, spsMaxSubLayersMinus1);
      readExpGolomb(bitstream);
      const chromaFormatIdc = readExpGolomb(bitstream);
      let separateColourPlaneFlag = 0;
      if (chromaFormatIdc === 3) {
        separateColourPlaneFlag = bitstream.readBits(1);
      }
      const picWidthInLumaSamples = readExpGolomb(bitstream);
      const picHeightInLumaSamples = readExpGolomb(bitstream);
      let displayWidth = picWidthInLumaSamples;
      let displayHeight = picHeightInLumaSamples;
      if (bitstream.readBits(1)) {
        const confWinLeftOffset = readExpGolomb(bitstream);
        const confWinRightOffset = readExpGolomb(bitstream);
        const confWinTopOffset = readExpGolomb(bitstream);
        const confWinBottomOffset = readExpGolomb(bitstream);
        let subWidthC = 1;
        let subHeightC = 1;
        const chromaArrayType = separateColourPlaneFlag === 0 ? chromaFormatIdc : 0;
        if (chromaArrayType === 1) {
          subWidthC = 2;
          subHeightC = 2;
        } else if (chromaArrayType === 2) {
          subWidthC = 2;
          subHeightC = 1;
        }
        displayWidth -= (confWinLeftOffset + confWinRightOffset) * subWidthC;
        displayHeight -= (confWinTopOffset + confWinBottomOffset) * subHeightC;
      }
      const bitDepthLumaMinus8 = readExpGolomb(bitstream);
      const bitDepthChromaMinus8 = readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      const spsSubLayerOrderingInfoPresentFlag = bitstream.readBits(1);
      const startI = spsSubLayerOrderingInfoPresentFlag ? 0 : spsMaxSubLayersMinus1;
      let spsMaxNumReorderPics = 0;
      for (let i = startI; i <= spsMaxSubLayersMinus1; i++) {
        readExpGolomb(bitstream);
        spsMaxNumReorderPics = readExpGolomb(bitstream);
        readExpGolomb(bitstream);
      }
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      if (bitstream.readBits(1)) {
        if (bitstream.readBits(1)) {
          skipScalingListData(bitstream);
        }
      }
      bitstream.skipBits(1);
      bitstream.skipBits(1);
      if (bitstream.readBits(1)) {
        bitstream.skipBits(4);
        bitstream.skipBits(4);
        readExpGolomb(bitstream);
        readExpGolomb(bitstream);
        bitstream.skipBits(1);
      }
      const numShortTermRefPicSets = readExpGolomb(bitstream);
      skipAllStRefPicSets(bitstream, numShortTermRefPicSets);
      if (bitstream.readBits(1)) {
        const numLongTermRefPicsSps = readExpGolomb(bitstream);
        for (let i = 0; i < numLongTermRefPicsSps; i++) {
          readExpGolomb(bitstream);
          bitstream.skipBits(1);
        }
      }
      bitstream.skipBits(1);
      bitstream.skipBits(1);
      let colourPrimaries = 2;
      let transferCharacteristics = 2;
      let matrixCoefficients = 2;
      let fullRangeFlag = 0;
      let minSpatialSegmentationIdc = 0;
      let pixelAspectRatio = { num: 1, den: 1 };
      if (bitstream.readBits(1)) {
        const vui = parseHevcVui(bitstream, spsMaxSubLayersMinus1);
        pixelAspectRatio = vui.pixelAspectRatio;
        colourPrimaries = vui.colourPrimaries;
        transferCharacteristics = vui.transferCharacteristics;
        matrixCoefficients = vui.matrixCoefficients;
        fullRangeFlag = vui.fullRangeFlag;
        minSpatialSegmentationIdc = vui.minSpatialSegmentationIdc;
      }
      return {
        displayWidth,
        displayHeight,
        pixelAspectRatio,
        colourPrimaries,
        transferCharacteristics,
        matrixCoefficients,
        fullRangeFlag,
        maxDecFrameBuffering: spsMaxNumReorderPics + 1,
        spsMaxSubLayersMinus1,
        spsTemporalIdNestingFlag,
        generalProfileSpace: general_profile_space,
        generalTierFlag: general_tier_flag,
        generalProfileIdc: general_profile_idc,
        generalProfileCompatibilityFlags: general_profile_compatibility_flags,
        generalConstraintIndicatorFlags: general_constraint_indicator_flags,
        generalLevelIdc: general_level_idc,
        chromaFormatIdc,
        bitDepthLumaMinus8,
        bitDepthChromaMinus8,
        minSpatialSegmentationIdc
      };
    } catch (error) {
      Logging._error("Error parsing HEVC SPS:", error);
      return null;
    }
  };
  var extractHevcDecoderConfigurationRecord = (packetData) => {
    try {
      const vpsUnits = [];
      const spsUnits = [];
      const ppsUnits = [];
      const seiUnits = [];
      for (const loc of iterateNalUnitsInAnnexB(packetData)) {
        const nalUnit = packetData.subarray(loc.offset, loc.offset + loc.length);
        const type = extractNalUnitTypeForHevc(nalUnit[0]);
        if (type === 32 /* VPS_NUT */) {
          vpsUnits.push(nalUnit);
        } else if (type === 33 /* SPS_NUT */) {
          spsUnits.push(nalUnit);
        } else if (type === 34 /* PPS_NUT */) {
          ppsUnits.push(nalUnit);
        } else if (type === 39 /* PREFIX_SEI_NUT */ || type === 40 /* SUFFIX_SEI_NUT */) {
          seiUnits.push(nalUnit);
        }
      }
      if (spsUnits.length === 0 || ppsUnits.length === 0) return null;
      const spsInfo = parseHevcSps(spsUnits[0]);
      if (!spsInfo) return null;
      let parallelismType = 0;
      if (ppsUnits.length > 0) {
        const pps = ppsUnits[0];
        const ppsBitstream = new Bitstream(removeEmulationPreventionBytes(pps));
        ppsBitstream.skipBits(16);
        readExpGolomb(ppsBitstream);
        readExpGolomb(ppsBitstream);
        ppsBitstream.skipBits(1);
        ppsBitstream.skipBits(1);
        ppsBitstream.skipBits(3);
        ppsBitstream.skipBits(1);
        ppsBitstream.skipBits(1);
        readExpGolomb(ppsBitstream);
        readExpGolomb(ppsBitstream);
        readSignedExpGolomb(ppsBitstream);
        ppsBitstream.skipBits(1);
        ppsBitstream.skipBits(1);
        if (ppsBitstream.readBits(1)) {
          readExpGolomb(ppsBitstream);
        }
        readSignedExpGolomb(ppsBitstream);
        readSignedExpGolomb(ppsBitstream);
        ppsBitstream.skipBits(1);
        ppsBitstream.skipBits(1);
        ppsBitstream.skipBits(1);
        ppsBitstream.skipBits(1);
        const tiles_enabled_flag = ppsBitstream.readBits(1);
        const entropy_coding_sync_enabled_flag = ppsBitstream.readBits(1);
        if (!tiles_enabled_flag && !entropy_coding_sync_enabled_flag) parallelismType = 0;
        else if (tiles_enabled_flag && !entropy_coding_sync_enabled_flag) parallelismType = 2;
        else if (!tiles_enabled_flag && entropy_coding_sync_enabled_flag) parallelismType = 3;
        else parallelismType = 0;
      }
      const arrays = [
        ...vpsUnits.length ? [
          {
            arrayCompleteness: 1,
            nalUnitType: 32 /* VPS_NUT */,
            nalUnits: vpsUnits
          }
        ] : [],
        ...spsUnits.length ? [
          {
            arrayCompleteness: 1,
            nalUnitType: 33 /* SPS_NUT */,
            nalUnits: spsUnits
          }
        ] : [],
        ...ppsUnits.length ? [
          {
            arrayCompleteness: 1,
            nalUnitType: 34 /* PPS_NUT */,
            nalUnits: ppsUnits
          }
        ] : [],
        ...seiUnits.length ? [
          {
            arrayCompleteness: 1,
            nalUnitType: extractNalUnitTypeForHevc(seiUnits[0][0]),
            nalUnits: seiUnits
          }
        ] : []
      ];
      const record = {
        configurationVersion: 1,
        generalProfileSpace: spsInfo.generalProfileSpace,
        generalTierFlag: spsInfo.generalTierFlag,
        generalProfileIdc: spsInfo.generalProfileIdc,
        generalProfileCompatibilityFlags: spsInfo.generalProfileCompatibilityFlags,
        generalConstraintIndicatorFlags: spsInfo.generalConstraintIndicatorFlags,
        generalLevelIdc: spsInfo.generalLevelIdc,
        minSpatialSegmentationIdc: spsInfo.minSpatialSegmentationIdc,
        parallelismType,
        chromaFormatIdc: spsInfo.chromaFormatIdc,
        bitDepthLumaMinus8: spsInfo.bitDepthLumaMinus8,
        bitDepthChromaMinus8: spsInfo.bitDepthChromaMinus8,
        avgFrameRate: 0,
        constantFrameRate: 0,
        numTemporalLayers: spsInfo.spsMaxSubLayersMinus1 + 1,
        temporalIdNested: spsInfo.spsTemporalIdNestingFlag,
        lengthSizeMinusOne: 3,
        arrays
      };
      return record;
    } catch (error) {
      Logging._error("Error building HEVC Decoder Configuration Record:", error);
      return null;
    }
  };
  var parseProfileTierLevel = (bitstream, maxNumSubLayersMinus1) => {
    const general_profile_space = bitstream.readBits(2);
    const general_tier_flag = bitstream.readBits(1);
    const general_profile_idc = bitstream.readBits(5);
    let general_profile_compatibility_flags = 0;
    for (let i = 0; i < 32; i++) {
      general_profile_compatibility_flags = general_profile_compatibility_flags << 1 | bitstream.readBits(1);
    }
    const general_constraint_indicator_flags = new Uint8Array(6);
    for (let i = 0; i < 6; i++) {
      general_constraint_indicator_flags[i] = bitstream.readBits(8);
    }
    const general_level_idc = bitstream.readBits(8);
    const sub_layer_profile_present_flag = [];
    const sub_layer_level_present_flag = [];
    for (let i = 0; i < maxNumSubLayersMinus1; i++) {
      sub_layer_profile_present_flag.push(bitstream.readBits(1));
      sub_layer_level_present_flag.push(bitstream.readBits(1));
    }
    if (maxNumSubLayersMinus1 > 0) {
      for (let i = maxNumSubLayersMinus1; i < 8; i++) {
        bitstream.skipBits(2);
      }
    }
    for (let i = 0; i < maxNumSubLayersMinus1; i++) {
      if (sub_layer_profile_present_flag[i]) bitstream.skipBits(88);
      if (sub_layer_level_present_flag[i]) bitstream.skipBits(8);
    }
    return {
      general_profile_space,
      general_tier_flag,
      general_profile_idc,
      general_profile_compatibility_flags,
      general_constraint_indicator_flags,
      general_level_idc
    };
  };
  var skipScalingListData = (bitstream) => {
    for (let sizeId = 0; sizeId < 4; sizeId++) {
      for (let matrixId = 0; matrixId < (sizeId === 3 ? 2 : 6); matrixId++) {
        const scaling_list_pred_mode_flag = bitstream.readBits(1);
        if (!scaling_list_pred_mode_flag) {
          readExpGolomb(bitstream);
        } else {
          const coefNum = Math.min(64, 1 << 4 + (sizeId << 1));
          if (sizeId > 1) {
            readSignedExpGolomb(bitstream);
          }
          for (let i = 0; i < coefNum; i++) {
            readSignedExpGolomb(bitstream);
          }
        }
      }
    }
  };
  var skipAllStRefPicSets = (bitstream, num_short_term_ref_pic_sets) => {
    const NumDeltaPocs = [];
    for (let stRpsIdx = 0; stRpsIdx < num_short_term_ref_pic_sets; stRpsIdx++) {
      NumDeltaPocs[stRpsIdx] = skipStRefPicSet(bitstream, stRpsIdx, num_short_term_ref_pic_sets, NumDeltaPocs);
    }
  };
  var skipStRefPicSet = (bitstream, stRpsIdx, num_short_term_ref_pic_sets, NumDeltaPocs) => {
    let NumDeltaPocsThis = 0;
    let inter_ref_pic_set_prediction_flag = 0;
    let RefRpsIdx = 0;
    if (stRpsIdx !== 0) {
      inter_ref_pic_set_prediction_flag = bitstream.readBits(1);
    }
    if (inter_ref_pic_set_prediction_flag) {
      if (stRpsIdx === num_short_term_ref_pic_sets) {
        const delta_idx_minus1 = readExpGolomb(bitstream);
        RefRpsIdx = stRpsIdx - (delta_idx_minus1 + 1);
      } else {
        RefRpsIdx = stRpsIdx - 1;
      }
      bitstream.readBits(1);
      readExpGolomb(bitstream);
      const numDelta = NumDeltaPocs[RefRpsIdx] ?? 0;
      for (let j = 0; j <= numDelta; j++) {
        const used_by_curr_pic_flag = bitstream.readBits(1);
        if (!used_by_curr_pic_flag) {
          bitstream.readBits(1);
        }
      }
      NumDeltaPocsThis = NumDeltaPocs[RefRpsIdx];
    } else {
      const num_negative_pics = readExpGolomb(bitstream);
      const num_positive_pics = readExpGolomb(bitstream);
      for (let i = 0; i < num_negative_pics; i++) {
        readExpGolomb(bitstream);
        bitstream.readBits(1);
      }
      for (let i = 0; i < num_positive_pics; i++) {
        readExpGolomb(bitstream);
        bitstream.readBits(1);
      }
      NumDeltaPocsThis = num_negative_pics + num_positive_pics;
    }
    return NumDeltaPocsThis;
  };
  var parseHevcVui = (bitstream, sps_max_sub_layers_minus1) => {
    let colourPrimaries = 2;
    let transferCharacteristics = 2;
    let matrixCoefficients = 2;
    let fullRangeFlag = 0;
    let minSpatialSegmentationIdc = 0;
    let pixelAspectRatio = { num: 1, den: 1 };
    if (bitstream.readBits(1)) {
      const aspect_ratio_idc = bitstream.readBits(8);
      if (aspect_ratio_idc === 255) {
        pixelAspectRatio = {
          num: bitstream.readBits(16),
          den: bitstream.readBits(16)
        };
      } else {
        const aspectRatio = AVC_HEVC_ASPECT_RATIO_IDC_TABLE[aspect_ratio_idc];
        if (aspectRatio) {
          pixelAspectRatio = aspectRatio;
        }
      }
    }
    if (bitstream.readBits(1)) {
      bitstream.readBits(1);
    }
    if (bitstream.readBits(1)) {
      bitstream.readBits(3);
      fullRangeFlag = bitstream.readBits(1);
      if (bitstream.readBits(1)) {
        colourPrimaries = bitstream.readBits(8);
        transferCharacteristics = bitstream.readBits(8);
        matrixCoefficients = bitstream.readBits(8);
      }
    }
    if (bitstream.readBits(1)) {
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
    }
    bitstream.readBits(1);
    bitstream.readBits(1);
    bitstream.readBits(1);
    if (bitstream.readBits(1)) {
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
    }
    if (bitstream.readBits(1)) {
      bitstream.readBits(32);
      bitstream.readBits(32);
      if (bitstream.readBits(1)) {
        readExpGolomb(bitstream);
      }
      if (bitstream.readBits(1)) {
        skipHevcHrdParameters(bitstream, true, sps_max_sub_layers_minus1);
      }
    }
    if (bitstream.readBits(1)) {
      bitstream.readBits(1);
      bitstream.readBits(1);
      bitstream.readBits(1);
      minSpatialSegmentationIdc = readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
    }
    return {
      pixelAspectRatio,
      colourPrimaries,
      transferCharacteristics,
      matrixCoefficients,
      fullRangeFlag,
      minSpatialSegmentationIdc
    };
  };
  var skipHevcHrdParameters = (bitstream, commonInfPresentFlag, maxNumSubLayersMinus1) => {
    let nal_hrd_parameters_present_flag = false;
    let vcl_hrd_parameters_present_flag = false;
    let sub_pic_hrd_params_present_flag = false;
    if (commonInfPresentFlag) {
      nal_hrd_parameters_present_flag = bitstream.readBits(1) === 1;
      vcl_hrd_parameters_present_flag = bitstream.readBits(1) === 1;
      if (nal_hrd_parameters_present_flag || vcl_hrd_parameters_present_flag) {
        sub_pic_hrd_params_present_flag = bitstream.readBits(1) === 1;
        if (sub_pic_hrd_params_present_flag) {
          bitstream.readBits(8);
          bitstream.readBits(5);
          bitstream.readBits(1);
          bitstream.readBits(5);
        }
        bitstream.readBits(4);
        bitstream.readBits(4);
        if (sub_pic_hrd_params_present_flag) {
          bitstream.readBits(4);
        }
        bitstream.readBits(5);
        bitstream.readBits(5);
        bitstream.readBits(5);
      }
    }
    for (let i = 0; i <= maxNumSubLayersMinus1; i++) {
      const fixed_pic_rate_general_flag = bitstream.readBits(1) === 1;
      let fixed_pic_rate_within_cvs_flag = true;
      if (!fixed_pic_rate_general_flag) {
        fixed_pic_rate_within_cvs_flag = bitstream.readBits(1) === 1;
      }
      let low_delay_hrd_flag = false;
      if (fixed_pic_rate_within_cvs_flag) {
        readExpGolomb(bitstream);
      } else {
        low_delay_hrd_flag = bitstream.readBits(1) === 1;
      }
      let CpbCnt = 1;
      if (!low_delay_hrd_flag) {
        const cpb_cnt_minus1 = readExpGolomb(bitstream);
        CpbCnt = cpb_cnt_minus1 + 1;
      }
      if (nal_hrd_parameters_present_flag) {
        skipSubLayerHrdParameters(bitstream, CpbCnt, sub_pic_hrd_params_present_flag);
      }
      if (vcl_hrd_parameters_present_flag) {
        skipSubLayerHrdParameters(bitstream, CpbCnt, sub_pic_hrd_params_present_flag);
      }
    }
  };
  var skipSubLayerHrdParameters = (bitstream, CpbCnt, sub_pic_hrd_params_present_flag) => {
    for (let i = 0; i < CpbCnt; i++) {
      readExpGolomb(bitstream);
      readExpGolomb(bitstream);
      if (sub_pic_hrd_params_present_flag) {
        readExpGolomb(bitstream);
        readExpGolomb(bitstream);
      }
      bitstream.readBits(1);
    }
  };
  var serializeHevcDecoderConfigurationRecord = (record) => {
    const bytes2 = [];
    bytes2.push(record.configurationVersion);
    bytes2.push(
      (record.generalProfileSpace & 3) << 6 | (record.generalTierFlag & 1) << 5 | record.generalProfileIdc & 31
    );
    bytes2.push(record.generalProfileCompatibilityFlags >>> 24 & 255);
    bytes2.push(record.generalProfileCompatibilityFlags >>> 16 & 255);
    bytes2.push(record.generalProfileCompatibilityFlags >>> 8 & 255);
    bytes2.push(record.generalProfileCompatibilityFlags & 255);
    bytes2.push(...record.generalConstraintIndicatorFlags);
    bytes2.push(record.generalLevelIdc & 255);
    bytes2.push(240 | record.minSpatialSegmentationIdc >> 8 & 15);
    bytes2.push(record.minSpatialSegmentationIdc & 255);
    bytes2.push(252 | record.parallelismType & 3);
    bytes2.push(252 | record.chromaFormatIdc & 3);
    bytes2.push(248 | record.bitDepthLumaMinus8 & 7);
    bytes2.push(248 | record.bitDepthChromaMinus8 & 7);
    bytes2.push(record.avgFrameRate >> 8 & 255);
    bytes2.push(record.avgFrameRate & 255);
    bytes2.push(
      (record.constantFrameRate & 3) << 6 | (record.numTemporalLayers & 7) << 3 | (record.temporalIdNested & 1) << 2 | record.lengthSizeMinusOne & 3
    );
    bytes2.push(record.arrays.length & 255);
    for (const arr of record.arrays) {
      bytes2.push(
        (arr.arrayCompleteness & 1) << 7 | 0 << 6 | arr.nalUnitType & 63
      );
      bytes2.push(arr.nalUnits.length >> 8 & 255);
      bytes2.push(arr.nalUnits.length & 255);
      for (const nal of arr.nalUnits) {
        bytes2.push(nal.length >> 8 & 255);
        bytes2.push(nal.length & 255);
        for (let i = 0; i < nal.length; i++) {
          bytes2.push(nal[i]);
        }
      }
    }
    return new Uint8Array(bytes2);
  };
  var deserializeHevcDecoderConfigurationRecord = (data) => {
    try {
      const view2 = toDataView(data);
      let offset = 0;
      const configurationVersion = view2.getUint8(offset++);
      const byte1 = view2.getUint8(offset++);
      const generalProfileSpace = byte1 >> 6 & 3;
      const generalTierFlag = byte1 >> 5 & 1;
      const generalProfileIdc = byte1 & 31;
      const generalProfileCompatibilityFlags = view2.getUint32(offset, false);
      offset += 4;
      const generalConstraintIndicatorFlags = data.subarray(offset, offset + 6);
      offset += 6;
      const generalLevelIdc = view2.getUint8(offset++);
      const minSpatialSegmentationIdc = (view2.getUint8(offset++) & 15) << 8 | view2.getUint8(offset++);
      const parallelismType = view2.getUint8(offset++) & 3;
      const chromaFormatIdc = view2.getUint8(offset++) & 3;
      const bitDepthLumaMinus8 = view2.getUint8(offset++) & 7;
      const bitDepthChromaMinus8 = view2.getUint8(offset++) & 7;
      const avgFrameRate = view2.getUint16(offset, false);
      offset += 2;
      const byte21 = view2.getUint8(offset++);
      const constantFrameRate = byte21 >> 6 & 3;
      const numTemporalLayers = byte21 >> 3 & 7;
      const temporalIdNested = byte21 >> 2 & 1;
      const lengthSizeMinusOne = byte21 & 3;
      const numOfArrays = view2.getUint8(offset++);
      const arrays = [];
      for (let i = 0; i < numOfArrays; i++) {
        const arrByte = view2.getUint8(offset++);
        const arrayCompleteness = arrByte >> 7 & 1;
        const nalUnitType = arrByte & 63;
        const numNalus = view2.getUint16(offset, false);
        offset += 2;
        const nalUnits = [];
        for (let j = 0; j < numNalus; j++) {
          const nalUnitLength = view2.getUint16(offset, false);
          offset += 2;
          nalUnits.push(data.subarray(offset, offset + nalUnitLength));
          offset += nalUnitLength;
        }
        arrays.push({
          arrayCompleteness,
          nalUnitType,
          nalUnits
        });
      }
      return {
        configurationVersion,
        generalProfileSpace,
        generalTierFlag,
        generalProfileIdc,
        generalProfileCompatibilityFlags,
        generalConstraintIndicatorFlags,
        generalLevelIdc,
        minSpatialSegmentationIdc,
        parallelismType,
        chromaFormatIdc,
        bitDepthLumaMinus8,
        bitDepthChromaMinus8,
        avgFrameRate,
        constantFrameRate,
        numTemporalLayers,
        temporalIdNested,
        lengthSizeMinusOne,
        arrays
      };
    } catch (error) {
      Logging._error("Error deserializing HEVC Decoder Configuration Record:", error);
      return null;
    }
  };
  var sanitizeHevcPacketForChromium = (packetData, decoderConfig) => {
    const removedNalUnits = /* @__PURE__ */ new Set();
    let orderState = 0 /* audAllowed */;
    for (const loc of iterateHevcNalUnits(packetData, decoderConfig)) {
      if (orderState === 4 /* noMoreDataAllowed */) {
        removedNalUnits.add(loc.offset);
        continue;
      }
      const type = extractNalUnitTypeForHevc(packetData[loc.offset]);
      if (orderState === 3 /* eoBitstreamAllowed */ && type !== 37) {
        removedNalUnits.add(loc.offset);
        continue;
      }
      let remove = false;
      if (type === 35) {
        if (orderState > 0 /* audAllowed */) {
          remove = true;
        } else {
          orderState = 1 /* beforeFirstVcl */;
        }
      } else if (type <= 31) {
        if (orderState > 2 /* afterFirstVcl */) {
          remove = true;
        } else {
          orderState = 2 /* afterFirstVcl */;
        }
      } else if (type === 36) {
        if (orderState !== 2 /* afterFirstVcl */) {
          remove = true;
        } else {
          orderState = 3 /* eoBitstreamAllowed */;
        }
      } else if (type === 37) {
        if (orderState < 2 /* afterFirstVcl */) {
          remove = true;
        } else {
          orderState = 4 /* noMoreDataAllowed */;
        }
      } else if (type === 32 || type === 33 || type === 34 || type === 39 || type >= 41 && type <= 44 || type >= 48 && type <= 55) {
        if (orderState > 1 /* beforeFirstVcl */) {
          remove = true;
        } else {
          orderState = 1 /* beforeFirstVcl */;
        }
      } else if (type === 38 || type === 40 || type >= 45 && type <= 47 || type >= 56 && type <= 63) {
        if (orderState < 2 /* afterFirstVcl */) {
          remove = true;
        }
      }
      if (remove) {
        removedNalUnits.add(loc.offset);
      }
    }
    if (removedNalUnits.size === 0) {
      return null;
    }
    const filteredNalUnits = [];
    for (const loc of iterateHevcNalUnits(packetData, decoderConfig)) {
      if (!removedNalUnits.has(loc.offset)) {
        filteredNalUnits.push(packetData.subarray(loc.offset, loc.offset + loc.length));
      }
    }
    return concatHevcNalUnits(filteredNalUnits, decoderConfig);
  };
  var extractVp9CodecInfoFromPacket = (packet) => {
    const bitstream = new Bitstream(packet);
    const frameMarker = bitstream.readBits(2);
    if (frameMarker !== 2) {
      return null;
    }
    const profileLowBit = bitstream.readBits(1);
    const profileHighBit = bitstream.readBits(1);
    const profile = (profileHighBit << 1) + profileLowBit;
    if (profile === 3) {
      bitstream.skipBits(1);
    }
    const showExistingFrame = bitstream.readBits(1);
    if (showExistingFrame === 1) {
      return null;
    }
    const frameType = bitstream.readBits(1);
    if (frameType !== 0) {
      return null;
    }
    bitstream.skipBits(2);
    const syncCode = bitstream.readBits(24);
    if (syncCode !== 4817730) {
      return null;
    }
    let bitDepth = 8;
    if (profile >= 2) {
      const tenOrTwelveBit = bitstream.readBits(1);
      bitDepth = tenOrTwelveBit ? 12 : 10;
    }
    const colorSpace = bitstream.readBits(3);
    let chromaSubsampling = 0;
    let videoFullRangeFlag = 0;
    if (colorSpace !== 7) {
      const colorRange = bitstream.readBits(1);
      videoFullRangeFlag = colorRange;
      if (profile === 1 || profile === 3) {
        const subsamplingX = bitstream.readBits(1);
        const subsamplingY = bitstream.readBits(1);
        chromaSubsampling = !subsamplingX && !subsamplingY ? 3 : subsamplingX && !subsamplingY ? 2 : 1;
        bitstream.skipBits(1);
      } else {
        chromaSubsampling = 1;
      }
    } else {
      chromaSubsampling = 3;
      videoFullRangeFlag = 1;
    }
    const widthMinusOne = bitstream.readBits(16);
    const heightMinusOne = bitstream.readBits(16);
    const width = widthMinusOne + 1;
    const height = heightMinusOne + 1;
    const pictureSize = width * height;
    let level = last(VP9_LEVEL_TABLE).level;
    for (const entry of VP9_LEVEL_TABLE) {
      if (pictureSize <= entry.maxPictureSize) {
        level = entry.level;
        break;
      }
    }
    const matrixCoefficients = colorSpace === 7 ? 0 : colorSpace === 2 ? 1 : colorSpace === 1 ? 6 : 2;
    const colourPrimaries = colorSpace === 2 ? 1 : colorSpace === 1 ? 6 : 2;
    const transferCharacteristics = colorSpace === 2 ? 1 : colorSpace === 1 ? 6 : 2;
    return {
      profile,
      level,
      bitDepth,
      chromaSubsampling,
      videoFullRangeFlag,
      colourPrimaries,
      transferCharacteristics,
      matrixCoefficients
    };
  };
  var iterateAv1PacketObus = function* (packet) {
    const bitstream = new Bitstream(packet);
    const readLeb128 = () => {
      let value = 0;
      for (let i = 0; i < 8; i++) {
        const byte = bitstream.readAlignedByte();
        value |= (byte & 127) << i * 7;
        if (!(byte & 128)) {
          break;
        }
        if (i === 7 && byte & 128) {
          return null;
        }
      }
      if (value >= 2 ** 32 - 1) {
        return null;
      }
      return value;
    };
    while (bitstream.getBitsLeft() >= 8) {
      bitstream.skipBits(1);
      const obuType = bitstream.readBits(4);
      const obuExtension = bitstream.readBits(1);
      const obuHasSizeField = bitstream.readBits(1);
      bitstream.skipBits(1);
      if (obuExtension) {
        bitstream.skipBits(8);
      }
      let obuSize;
      if (obuHasSizeField) {
        const obuSizeValue = readLeb128();
        if (obuSizeValue === null) return;
        obuSize = obuSizeValue;
      } else {
        obuSize = Math.floor(bitstream.getBitsLeft() / 8);
      }
      assert(bitstream.pos % 8 === 0);
      yield {
        type: obuType,
        data: packet.subarray(bitstream.pos / 8, bitstream.pos / 8 + obuSize)
      };
      bitstream.skipBits(obuSize * 8);
    }
  };
  var extractAv1CodecInfoFromPacket = (packet) => {
    for (const { type, data } of iterateAv1PacketObus(packet)) {
      if (type !== 1) {
        continue;
      }
      const bitstream = new Bitstream(data);
      const seqProfile = bitstream.readBits(3);
      const stillPicture = bitstream.readBits(1);
      const reducedStillPictureHeader = bitstream.readBits(1);
      let seqLevel = 0;
      let seqTier = 0;
      let bufferDelayLengthMinus1 = 0;
      if (reducedStillPictureHeader) {
        seqLevel = bitstream.readBits(5);
      } else {
        const timingInfoPresentFlag = bitstream.readBits(1);
        if (timingInfoPresentFlag) {
          bitstream.skipBits(32);
          bitstream.skipBits(32);
          const equalPictureInterval = bitstream.readBits(1);
          if (equalPictureInterval) {
            return null;
          }
        }
        const decoderModelInfoPresentFlag = bitstream.readBits(1);
        if (decoderModelInfoPresentFlag) {
          bufferDelayLengthMinus1 = bitstream.readBits(5);
          bitstream.skipBits(32);
          bitstream.skipBits(5);
          bitstream.skipBits(5);
        }
        const operatingPointsCntMinus1 = bitstream.readBits(5);
        for (let i = 0; i <= operatingPointsCntMinus1; i++) {
          bitstream.skipBits(12);
          const seqLevelIdx = bitstream.readBits(5);
          if (i === 0) {
            seqLevel = seqLevelIdx;
          }
          if (seqLevelIdx > 7) {
            const seqTierTemp = bitstream.readBits(1);
            if (i === 0) {
              seqTier = seqTierTemp;
            }
          }
          if (decoderModelInfoPresentFlag) {
            const decoderModelPresentForThisOp = bitstream.readBits(1);
            if (decoderModelPresentForThisOp) {
              const n = bufferDelayLengthMinus1 + 1;
              bitstream.skipBits(n);
              bitstream.skipBits(n);
              bitstream.skipBits(1);
            }
          }
          const initialDisplayDelayPresentFlag = bitstream.readBits(1);
          if (initialDisplayDelayPresentFlag) {
            bitstream.skipBits(4);
          }
        }
      }
      const frameWidthBitsMinus1 = bitstream.readBits(4);
      const frameHeightBitsMinus1 = bitstream.readBits(4);
      const n1 = frameWidthBitsMinus1 + 1;
      bitstream.skipBits(n1);
      const n2 = frameHeightBitsMinus1 + 1;
      bitstream.skipBits(n2);
      let frameIdNumbersPresentFlag = 0;
      if (reducedStillPictureHeader) {
        frameIdNumbersPresentFlag = 0;
      } else {
        frameIdNumbersPresentFlag = bitstream.readBits(1);
      }
      if (frameIdNumbersPresentFlag) {
        bitstream.skipBits(4);
        bitstream.skipBits(3);
      }
      bitstream.skipBits(1);
      bitstream.skipBits(1);
      bitstream.skipBits(1);
      if (!reducedStillPictureHeader) {
        bitstream.skipBits(1);
        bitstream.skipBits(1);
        bitstream.skipBits(1);
        bitstream.skipBits(1);
        const enableOrderHint = bitstream.readBits(1);
        if (enableOrderHint) {
          bitstream.skipBits(1);
          bitstream.skipBits(1);
        }
        const seqChooseScreenContentTools = bitstream.readBits(1);
        let seqForceScreenContentTools = 0;
        if (seqChooseScreenContentTools) {
          seqForceScreenContentTools = 2;
        } else {
          seqForceScreenContentTools = bitstream.readBits(1);
        }
        if (seqForceScreenContentTools > 0) {
          const seqChooseIntegerMv = bitstream.readBits(1);
          if (!seqChooseIntegerMv) {
            bitstream.skipBits(1);
          }
        }
        if (enableOrderHint) {
          bitstream.skipBits(3);
        }
      }
      bitstream.skipBits(1);
      bitstream.skipBits(1);
      bitstream.skipBits(1);
      const highBitdepth = bitstream.readBits(1);
      let bitDepth = 8;
      if (seqProfile === 2 && highBitdepth) {
        const twelveBit = bitstream.readBits(1);
        bitDepth = twelveBit ? 12 : 10;
      } else if (seqProfile <= 2) {
        bitDepth = highBitdepth ? 10 : 8;
      }
      let monochrome = 0;
      if (seqProfile !== 1) {
        monochrome = bitstream.readBits(1);
      }
      let chromaSubsamplingX = 1;
      let chromaSubsamplingY = 1;
      let chromaSamplePosition = 0;
      if (!monochrome) {
        if (seqProfile === 0) {
          chromaSubsamplingX = 1;
          chromaSubsamplingY = 1;
        } else if (seqProfile === 1) {
          chromaSubsamplingX = 0;
          chromaSubsamplingY = 0;
        } else {
          if (bitDepth === 12) {
            chromaSubsamplingX = bitstream.readBits(1);
            if (chromaSubsamplingX) {
              chromaSubsamplingY = bitstream.readBits(1);
            }
          }
        }
        if (chromaSubsamplingX && chromaSubsamplingY) {
          chromaSamplePosition = bitstream.readBits(2);
        }
      }
      return {
        profile: seqProfile,
        level: seqLevel,
        tier: seqTier,
        bitDepth,
        monochrome,
        chromaSubsamplingX,
        chromaSubsamplingY,
        chromaSamplePosition
      };
    }
    return null;
  };
  var parseOpusIdentificationHeader = (bytes2) => {
    const view2 = toDataView(bytes2);
    const outputChannelCount = view2.getUint8(9);
    const preSkip = view2.getUint16(10, true);
    const inputSampleRate = view2.getUint32(12, true);
    const outputGain = view2.getInt16(16, true);
    const channelMappingFamily = view2.getUint8(18);
    let channelMappingTable = null;
    if (channelMappingFamily) {
      channelMappingTable = bytes2.subarray(19, 19 + 2 + outputChannelCount);
    }
    return {
      outputChannelCount,
      preSkip,
      inputSampleRate,
      outputGain,
      channelMappingFamily,
      channelMappingTable
    };
  };
  var OPUS_FRAME_DURATION_TABLE = [
    480,
    960,
    1920,
    2880,
    480,
    960,
    1920,
    2880,
    480,
    960,
    1920,
    2880,
    480,
    960,
    480,
    960,
    120,
    240,
    480,
    960,
    120,
    240,
    480,
    960,
    120,
    240,
    480,
    960,
    120,
    240,
    480,
    960
  ];
  var parseOpusTocByte = (packet) => {
    const config = packet[0] >> 3;
    const code = packet[0] & 3;
    let frameCount;
    if (code === 0) {
      frameCount = 1;
    } else if (code === 1 || code === 2) {
      frameCount = 2;
    } else {
      frameCount = packet[1] & 63;
    }
    return {
      durationInSamples: OPUS_FRAME_DURATION_TABLE[config] * frameCount
    };
  };
  var parseModesFromVorbisSetupPacket = (setupHeader) => {
    if (setupHeader.length < 7) {
      throw new Error("Setup header is too short.");
    }
    if (setupHeader[0] !== 5) {
      throw new Error("Wrong packet type in Setup header.");
    }
    const signature = String.fromCharCode(...setupHeader.slice(1, 7));
    if (signature !== "vorbis") {
      throw new Error("Invalid packet signature in Setup header.");
    }
    const bufSize = setupHeader.length;
    const revBuffer = new Uint8Array(bufSize);
    for (let i = 0; i < bufSize; i++) {
      revBuffer[i] = setupHeader[bufSize - 1 - i];
    }
    const bitstream = new Bitstream(revBuffer);
    let gotFramingBit = 0;
    while (bitstream.getBitsLeft() > 97) {
      if (bitstream.readBits(1) === 1) {
        gotFramingBit = bitstream.pos;
        break;
      }
    }
    if (gotFramingBit === 0) {
      throw new Error("Invalid Setup header: framing bit not found.");
    }
    let modeCount = 0;
    let gotModeHeader = false;
    let lastModeCount = 0;
    while (bitstream.getBitsLeft() >= 97) {
      const tempPos = bitstream.pos;
      const a = bitstream.readBits(8);
      const b = bitstream.readBits(16);
      const c = bitstream.readBits(16);
      if (a > 63 || b !== 0 || c !== 0) {
        bitstream.pos = tempPos;
        break;
      }
      bitstream.skipBits(1);
      modeCount++;
      if (modeCount > 64) {
        break;
      }
      const bsClone = bitstream.clone();
      const candidate = bsClone.readBits(6) + 1;
      if (candidate === modeCount) {
        gotModeHeader = true;
        lastModeCount = modeCount;
      }
    }
    if (!gotModeHeader) {
      throw new Error("Invalid Setup header: mode header not found.");
    }
    if (lastModeCount > 63) {
      throw new Error(`Unsupported mode count: ${lastModeCount}.`);
    }
    const finalModeCount = lastModeCount;
    bitstream.pos = 0;
    bitstream.skipBits(gotFramingBit);
    const modeBlockflags = Array(finalModeCount).fill(0);
    for (let i = finalModeCount - 1; i >= 0; i--) {
      bitstream.skipBits(40);
      modeBlockflags[i] = bitstream.readBits(1);
    }
    return { modeBlockflags };
  };
  var determineVideoPacketType = (codec, decoderConfig, packetData) => {
    switch (codec) {
      case "avc":
        {
          for (const loc of iterateAvcNalUnits(packetData, decoderConfig)) {
            const nalTypeByte = packetData[loc.offset];
            const type = extractNalUnitTypeForAvc(nalTypeByte);
            if (type >= 1 /* NON_IDR_SLICE */ && type <= 4 /* SLICE_DPC */) {
              return "delta";
            }
            if (type === 5 /* IDR */) {
              return "key";
            }
            if (type === 6 /* SEI */ && (!isChromium() || getChromiumVersion() >= 144)) {
              const nalUnit = packetData.subarray(loc.offset, loc.offset + loc.length);
              const bytes2 = removeEmulationPreventionBytes(nalUnit);
              let pos = 1;
              do {
                let payloadType = 0;
                while (true) {
                  const nextByte = bytes2[pos++];
                  if (nextByte === void 0) break;
                  payloadType += nextByte;
                  if (nextByte < 255) {
                    break;
                  }
                }
                let payloadSize = 0;
                while (true) {
                  const nextByte = bytes2[pos++];
                  if (nextByte === void 0) break;
                  payloadSize += nextByte;
                  if (nextByte < 255) {
                    break;
                  }
                }
                const PAYLOAD_TYPE_RECOVERY_POINT = 6;
                if (payloadType === PAYLOAD_TYPE_RECOVERY_POINT) {
                  const bitstream = new Bitstream(bytes2);
                  bitstream.pos = 8 * pos;
                  const recoveryFrameCount = readExpGolomb(bitstream);
                  const exactMatchFlag = bitstream.readBits(1);
                  if (recoveryFrameCount === 0 && exactMatchFlag === 1) {
                    return "key";
                  }
                }
                pos += payloadSize;
              } while (pos < bytes2.length - 1);
            }
          }
          return "delta";
        }
        ;
      case "hevc":
        {
          for (const loc of iterateHevcNalUnits(packetData, decoderConfig)) {
            const type = extractNalUnitTypeForHevc(packetData[loc.offset]);
            if (type < 16 /* BLA_W_LP */) {
              return "delta";
            }
            if (type <= 23 /* RSV_IRAP_VCL23 */) {
              return "key";
            }
          }
          return "delta";
        }
        ;
      case "vp8":
        {
          const frameType = packetData[0] & 1;
          return frameType === 0 ? "key" : "delta";
        }
        ;
      case "vp9":
        {
          const bitstream = new Bitstream(packetData);
          if (bitstream.readBits(2) !== 2) {
            return null;
          }
          ;
          const profileLowBit = bitstream.readBits(1);
          const profileHighBit = bitstream.readBits(1);
          const profile = (profileHighBit << 1) + profileLowBit;
          if (profile === 3) {
            bitstream.skipBits(1);
          }
          const showExistingFrame = bitstream.readBits(1);
          if (showExistingFrame) {
            return null;
          }
          const frameType = bitstream.readBits(1);
          return frameType === 0 ? "key" : "delta";
        }
        ;
      case "av1":
        {
          let reducedStillPictureHeader = false;
          for (const { type, data } of iterateAv1PacketObus(packetData)) {
            if (type === 1) {
              const bitstream = new Bitstream(data);
              bitstream.skipBits(4);
              reducedStillPictureHeader = !!bitstream.readBits(1);
            } else if (type === 3 || type === 6 || type === 7) {
              if (reducedStillPictureHeader) {
                return "key";
              }
              const bitstream = new Bitstream(data);
              const showExistingFrame = bitstream.readBits(1);
              if (showExistingFrame) {
                return null;
              }
              const frameType = bitstream.readBits(2);
              return frameType === 0 ? "key" : "delta";
            }
          }
          return null;
        }
        ;
      case "prores":
        {
          return "key";
        }
        ;
      default:
        {
          assertNever(codec);
          assert(false);
        }
        ;
    }
  };
  var readVorbisComments = (bytes2, metadataTags) => {
    const commentView = toDataView(bytes2);
    let commentPos = 0;
    const vendorStringLength = commentView.getUint32(commentPos, true);
    commentPos += 4;
    const vendorString = textDecoder.decode(
      bytes2.subarray(commentPos, commentPos + vendorStringLength)
    );
    commentPos += vendorStringLength;
    if (vendorStringLength > 0) {
      metadataTags.raw ??= {};
      metadataTags.raw["vendor"] ??= vendorString;
    }
    const listLength = commentView.getUint32(commentPos, true);
    commentPos += 4;
    for (let i = 0; i < listLength; i++) {
      const stringLength = commentView.getUint32(commentPos, true);
      commentPos += 4;
      const string = textDecoder.decode(
        bytes2.subarray(commentPos, commentPos + stringLength)
      );
      commentPos += stringLength;
      const separatorIndex = string.indexOf("=");
      if (separatorIndex === -1) {
        continue;
      }
      const key = string.slice(0, separatorIndex).toUpperCase();
      const value = string.slice(separatorIndex + 1);
      metadataTags.raw ??= {};
      metadataTags.raw[key] ??= value;
      switch (key) {
        case "TITLE":
          {
            metadataTags.title ??= value;
          }
          ;
          break;
        case "DESCRIPTION":
          {
            metadataTags.description ??= value;
          }
          ;
          break;
        case "ARTIST":
          {
            metadataTags.artist ??= value;
          }
          ;
          break;
        case "ALBUM":
          {
            metadataTags.album ??= value;
          }
          ;
          break;
        case "ALBUMARTIST":
          {
            metadataTags.albumArtist ??= value;
          }
          ;
          break;
        case "COMMENT":
          {
            metadataTags.comment ??= value;
          }
          ;
          break;
        case "LYRICS":
          {
            metadataTags.lyrics ??= value;
          }
          ;
          break;
        case "TRACKNUMBER":
          {
            const parts = value.split("/");
            const trackNum = Number.parseInt(parts[0], 10);
            const tracksTotal = parts[1] && Number.parseInt(parts[1], 10);
            if (Number.isInteger(trackNum) && trackNum > 0) {
              metadataTags.trackNumber ??= trackNum;
            }
            if (tracksTotal && Number.isInteger(tracksTotal) && tracksTotal > 0) {
              metadataTags.tracksTotal ??= tracksTotal;
            }
          }
          ;
          break;
        case "TRACKTOTAL":
          {
            const tracksTotal = Number.parseInt(value, 10);
            if (Number.isInteger(tracksTotal) && tracksTotal > 0) {
              metadataTags.tracksTotal ??= tracksTotal;
            }
          }
          ;
          break;
        case "DISCNUMBER":
          {
            const parts = value.split("/");
            const discNum = Number.parseInt(parts[0], 10);
            const discsTotal = parts[1] && Number.parseInt(parts[1], 10);
            if (Number.isInteger(discNum) && discNum > 0) {
              metadataTags.discNumber ??= discNum;
            }
            if (discsTotal && Number.isInteger(discsTotal) && discsTotal > 0) {
              metadataTags.discsTotal ??= discsTotal;
            }
          }
          ;
          break;
        case "DISCTOTAL":
          {
            const discsTotal = Number.parseInt(value, 10);
            if (Number.isInteger(discsTotal) && discsTotal > 0) {
              metadataTags.discsTotal ??= discsTotal;
            }
          }
          ;
          break;
        case "DATE":
          {
            const date = new Date(value);
            if (!Number.isNaN(date.getTime())) {
              metadataTags.date ??= date;
            }
          }
          ;
          break;
        case "GENRE":
          {
            metadataTags.genre ??= value;
          }
          ;
          break;
        case "METADATA_BLOCK_PICTURE":
          {
            const decoded = base64ToBytes(value);
            const view2 = toDataView(decoded);
            const pictureType = view2.getUint32(0, false);
            const mediaTypeLength = view2.getUint32(4, false);
            const mediaType = String.fromCharCode(...decoded.subarray(8, 8 + mediaTypeLength));
            const descriptionLength = view2.getUint32(8 + mediaTypeLength, false);
            const description = textDecoder.decode(decoded.subarray(
              12 + mediaTypeLength,
              12 + mediaTypeLength + descriptionLength
            ));
            const dataLength = view2.getUint32(mediaTypeLength + descriptionLength + 28);
            const data = decoded.subarray(
              mediaTypeLength + descriptionLength + 32,
              mediaTypeLength + descriptionLength + 32 + dataLength
            );
            metadataTags.images ??= [];
            metadataTags.images.push({
              data,
              mimeType: mediaType,
              kind: pictureType === 3 ? "coverFront" : pictureType === 4 ? "coverBack" : "unknown",
              name: void 0,
              description: description || void 0
            });
          }
          ;
          break;
      }
    }
  };
  var createVorbisComments = (headerBytes, tags, writeImages) => {
    const commentHeaderParts = [
      headerBytes
    ];
    const vendorString = "Mediabunny";
    const encodedVendorString = textEncoder.encode(vendorString);
    let currentBuffer = new Uint8Array(4 + encodedVendorString.length);
    let currentView = new DataView(currentBuffer.buffer);
    currentView.setUint32(0, encodedVendorString.length, true);
    currentBuffer.set(encodedVendorString, 4);
    commentHeaderParts.push(currentBuffer);
    const writtenTags = /* @__PURE__ */ new Set();
    const addCommentTag = (key, value) => {
      const joined = `${key}=${value}`;
      const encoded = textEncoder.encode(joined);
      currentBuffer = new Uint8Array(4 + encoded.length);
      currentView = new DataView(currentBuffer.buffer);
      currentView.setUint32(0, encoded.length, true);
      currentBuffer.set(encoded, 4);
      commentHeaderParts.push(currentBuffer);
      writtenTags.add(key);
    };
    for (const { key, value } of keyValueIterator(tags)) {
      switch (key) {
        case "title":
          {
            addCommentTag("TITLE", value);
          }
          ;
          break;
        case "description":
          {
            addCommentTag("DESCRIPTION", value);
          }
          ;
          break;
        case "artist":
          {
            addCommentTag("ARTIST", value);
          }
          ;
          break;
        case "album":
          {
            addCommentTag("ALBUM", value);
          }
          ;
          break;
        case "albumArtist":
          {
            addCommentTag("ALBUMARTIST", value);
          }
          ;
          break;
        case "genre":
          {
            addCommentTag("GENRE", value);
          }
          ;
          break;
        case "date":
          {
            const rawVersion = tags.raw?.["DATE"] ?? tags.raw?.["date"];
            if (rawVersion && typeof rawVersion === "string") {
              addCommentTag("DATE", rawVersion);
            } else {
              addCommentTag("DATE", value.toISOString().slice(0, 10));
            }
          }
          ;
          break;
        case "comment":
          {
            addCommentTag("COMMENT", value);
          }
          ;
          break;
        case "lyrics":
          {
            addCommentTag("LYRICS", value);
          }
          ;
          break;
        case "trackNumber":
          {
            addCommentTag("TRACKNUMBER", value.toString());
          }
          ;
          break;
        case "tracksTotal":
          {
            addCommentTag("TRACKTOTAL", value.toString());
          }
          ;
          break;
        case "discNumber":
          {
            addCommentTag("DISCNUMBER", value.toString());
          }
          ;
          break;
        case "discsTotal":
          {
            addCommentTag("DISCTOTAL", value.toString());
          }
          ;
          break;
        case "images":
          {
            if (!writeImages) {
              break;
            }
            for (const image of value) {
              const pictureType = image.kind === "coverFront" ? 3 : image.kind === "coverBack" ? 4 : 0;
              const encodedMediaType = new Uint8Array(image.mimeType.length);
              for (let i = 0; i < image.mimeType.length; i++) {
                encodedMediaType[i] = image.mimeType.charCodeAt(i);
              }
              const encodedDescription = textEncoder.encode(image.description ?? "");
              const buffer = new Uint8Array(
                4 + 4 + encodedMediaType.length + 4 + encodedDescription.length + 16 + 4 + image.data.length
                // Picture data
              );
              const view2 = toDataView(buffer);
              view2.setUint32(0, pictureType, false);
              view2.setUint32(4, encodedMediaType.length, false);
              buffer.set(encodedMediaType, 8);
              view2.setUint32(8 + encodedMediaType.length, encodedDescription.length, false);
              buffer.set(encodedDescription, 12 + encodedMediaType.length);
              view2.setUint32(
                28 + encodedMediaType.length + encodedDescription.length,
                image.data.length,
                false
              );
              buffer.set(
                image.data,
                32 + encodedMediaType.length + encodedDescription.length
              );
              const encoded = bytesToBase64(buffer);
              addCommentTag("METADATA_BLOCK_PICTURE", encoded);
            }
          }
          ;
          break;
        case "raw":
          {
          }
          ;
          break;
        default:
          assertNever(key);
      }
    }
    if (tags.raw) {
      for (const key in tags.raw) {
        const value = tags.raw[key] ?? tags.raw[key.toLowerCase()];
        if (key === "vendor" || value == null || writtenTags.has(key)) {
          continue;
        }
        if (typeof value === "string") {
          addCommentTag(key, value);
        }
      }
    }
    const listLengthBuffer = new Uint8Array(4);
    toDataView(listLengthBuffer).setUint32(0, writtenTags.size, true);
    commentHeaderParts.splice(2, 0, listLengthBuffer);
    const commentHeaderLength = commentHeaderParts.reduce((a, b) => a + b.length, 0);
    const commentHeader = new Uint8Array(commentHeaderLength);
    let pos = 0;
    for (const part of commentHeaderParts) {
      commentHeader.set(part, pos);
      pos += part.length;
    }
    return commentHeader;
  };
  var AC3_ACMOD_CHANNEL_COUNTS = [2, 1, 2, 3, 3, 4, 4, 5];
  var parseAc3SyncFrame = (data) => {
    if (data.length < 7) {
      return null;
    }
    if (data[0] !== 11 || data[1] !== 119) {
      return null;
    }
    const bitstream = new Bitstream(data);
    bitstream.skipBits(16);
    bitstream.skipBits(16);
    const fscod = bitstream.readBits(2);
    if (fscod === 3) {
      return null;
    }
    const frmsizecod = bitstream.readBits(6);
    const bsid = bitstream.readBits(5);
    if (bsid > 8) {
      return null;
    }
    const bsmod = bitstream.readBits(3);
    const acmod = bitstream.readBits(3);
    if ((acmod & 1) !== 0 && acmod !== 1) {
      bitstream.skipBits(2);
    }
    if ((acmod & 4) !== 0) {
      bitstream.skipBits(2);
    }
    if (acmod === 2) {
      bitstream.skipBits(2);
    }
    const lfeon = bitstream.readBits(1);
    const bitRateCode = Math.floor(frmsizecod / 2);
    return { fscod, bsid, bsmod, acmod, lfeon, bitRateCode };
  };
  var AC3_FRAME_SIZES = [
    // frmsizecod, [48kHz, 44.1kHz, 32kHz] in bytes
    64 * 2,
    69 * 2,
    96 * 2,
    64 * 2,
    70 * 2,
    96 * 2,
    80 * 2,
    87 * 2,
    120 * 2,
    80 * 2,
    88 * 2,
    120 * 2,
    96 * 2,
    104 * 2,
    144 * 2,
    96 * 2,
    105 * 2,
    144 * 2,
    112 * 2,
    121 * 2,
    168 * 2,
    112 * 2,
    122 * 2,
    168 * 2,
    128 * 2,
    139 * 2,
    192 * 2,
    128 * 2,
    140 * 2,
    192 * 2,
    160 * 2,
    174 * 2,
    240 * 2,
    160 * 2,
    175 * 2,
    240 * 2,
    192 * 2,
    208 * 2,
    288 * 2,
    192 * 2,
    209 * 2,
    288 * 2,
    224 * 2,
    243 * 2,
    336 * 2,
    224 * 2,
    244 * 2,
    336 * 2,
    256 * 2,
    278 * 2,
    384 * 2,
    256 * 2,
    279 * 2,
    384 * 2,
    320 * 2,
    348 * 2,
    480 * 2,
    320 * 2,
    349 * 2,
    480 * 2,
    384 * 2,
    417 * 2,
    576 * 2,
    384 * 2,
    418 * 2,
    576 * 2,
    448 * 2,
    487 * 2,
    672 * 2,
    448 * 2,
    488 * 2,
    672 * 2,
    512 * 2,
    557 * 2,
    768 * 2,
    512 * 2,
    558 * 2,
    768 * 2,
    640 * 2,
    696 * 2,
    960 * 2,
    640 * 2,
    697 * 2,
    960 * 2,
    768 * 2,
    835 * 2,
    1152 * 2,
    768 * 2,
    836 * 2,
    1152 * 2,
    896 * 2,
    975 * 2,
    1344 * 2,
    896 * 2,
    976 * 2,
    1344 * 2,
    1024 * 2,
    1114 * 2,
    1536 * 2,
    1024 * 2,
    1115 * 2,
    1536 * 2,
    1152 * 2,
    1253 * 2,
    1728 * 2,
    1152 * 2,
    1254 * 2,
    1728 * 2,
    1280 * 2,
    1393 * 2,
    1920 * 2,
    1280 * 2,
    1394 * 2,
    1920 * 2
  ];
  var AC3_SAMPLES_PER_FRAME = 1536;
  var AC3_REGISTRATION_DESCRIPTOR = new Uint8Array([5, 4, 65, 67, 45, 51]);
  var EAC3_REGISTRATION_DESCRIPTOR = new Uint8Array([5, 4, 69, 65, 67, 51]);
  var EAC3_NUMBLKS_TABLE = [1, 2, 3, 6];
  var parseEac3SyncFrame = (data) => {
    if (data.length < 6) {
      return null;
    }
    if (data[0] !== 11 || data[1] !== 119) {
      return null;
    }
    const bitstream = new Bitstream(data);
    bitstream.skipBits(16);
    const strmtyp = bitstream.readBits(2);
    bitstream.skipBits(3);
    if (strmtyp !== 0 && strmtyp !== 2) {
      return null;
    }
    const frmsiz = bitstream.readBits(11);
    const fscod = bitstream.readBits(2);
    let fscod2 = 0;
    let numblkscod;
    if (fscod === 3) {
      fscod2 = bitstream.readBits(2);
      numblkscod = 3;
    } else {
      numblkscod = bitstream.readBits(2);
    }
    const acmod = bitstream.readBits(3);
    const lfeon = bitstream.readBits(1);
    const bsid = bitstream.readBits(5);
    if (bsid < 11 || bsid > 16) {
      return null;
    }
    const numblks = EAC3_NUMBLKS_TABLE[numblkscod];
    let fs;
    if (fscod < 3) {
      fs = AC3_SAMPLE_RATES[fscod] / 1e3;
    } else {
      fs = EAC3_REDUCED_SAMPLE_RATES[fscod2] / 1e3;
    }
    const dataRate = Math.round((frmsiz + 1) * fs / (numblks * 16));
    const bsmod = 0;
    const numDepSub = 0;
    const chanLoc = 0;
    const substream = {
      fscod,
      fscod2,
      bsid,
      bsmod,
      acmod,
      lfeon,
      numDepSub,
      chanLoc
    };
    return {
      dataRate,
      substreams: [substream]
    };
  };
  var parseEac3Config = (data) => {
    if (data.length < 2) {
      return null;
    }
    const bitstream = new Bitstream(data);
    const dataRate = bitstream.readBits(13);
    const numIndSub = bitstream.readBits(3);
    const substreams = [];
    for (let i = 0; i <= numIndSub; i++) {
      if (Math.ceil(bitstream.pos / 8) + 3 > data.length) {
        break;
      }
      const fscod = bitstream.readBits(2);
      const bsid = bitstream.readBits(5);
      bitstream.skipBits(1);
      bitstream.skipBits(1);
      const bsmod = bitstream.readBits(3);
      const acmod = bitstream.readBits(3);
      const lfeon = bitstream.readBits(1);
      bitstream.skipBits(3);
      const numDepSub = bitstream.readBits(4);
      let chanLoc = 0;
      if (numDepSub > 0) {
        chanLoc = bitstream.readBits(9);
      } else {
        bitstream.skipBits(1);
      }
      substreams.push({
        fscod,
        fscod2: null,
        bsid,
        bsmod,
        acmod,
        lfeon,
        numDepSub,
        chanLoc
      });
    }
    if (substreams.length === 0) {
      return null;
    }
    return { dataRate, substreams };
  };
  var getEac3SampleRate = (config) => {
    const sub = config.substreams[0];
    assert(sub);
    if (sub.fscod < 3) {
      return AC3_SAMPLE_RATES[sub.fscod];
    } else if (sub.fscod2 !== null && sub.fscod2 < 3) {
      return EAC3_REDUCED_SAMPLE_RATES[sub.fscod2];
    }
    return null;
  };
  var getEac3ChannelCount = (config) => {
    const sub = config.substreams[0];
    assert(sub);
    let channels = AC3_ACMOD_CHANNEL_COUNTS[sub.acmod] + sub.lfeon;
    if (sub.numDepSub > 0) {
      const CHAN_LOC_COUNTS = [2, 2, 1, 1, 2, 2, 2, 1, 1];
      for (let bit = 0; bit < 9; bit++) {
        if (sub.chanLoc & 1 << 8 - bit) {
          channels += CHAN_LOC_COUNTS[bit];
        }
      }
    }
    return channels;
  };

  // src/demuxer.ts
  var Demuxer = class {
    constructor(input) {
      this.input = input;
    }
    dispose() {
    }
  };

  // src/packet.ts
  var PLACEHOLDER_DATA = /* @__PURE__ */ new Uint8Array(0);
  var EncodedPacket = class _EncodedPacket {
    /** Creates a new {@link EncodedPacket} from raw bytes and timing information. */
    constructor(data, type, timestamp, duration, sequenceNumber = -1, byteLength, sideData) {
      this.data = data;
      this.type = type;
      this.timestamp = timestamp;
      this.duration = duration;
      this.sequenceNumber = sequenceNumber;
      if (data === PLACEHOLDER_DATA && byteLength === void 0) {
        throw new Error(
          "Internal error: byteLength must be explicitly provided when constructing metadata-only packets."
        );
      }
      if (byteLength === void 0) {
        byteLength = data.byteLength;
      }
      if (!(data instanceof Uint8Array)) {
        throw new TypeError("data must be a Uint8Array.");
      }
      if (type !== "key" && type !== "delta") {
        throw new TypeError('type must be either "key" or "delta".');
      }
      if (!Number.isFinite(timestamp)) {
        throw new TypeError("timestamp must be a number.");
      }
      if (!Number.isFinite(duration) || duration < 0) {
        throw new TypeError("duration must be a non-negative number.");
      }
      if (!Number.isFinite(sequenceNumber)) {
        throw new TypeError("sequenceNumber must be a number.");
      }
      if (!Number.isInteger(byteLength) || byteLength < 0) {
        throw new TypeError("byteLength must be a non-negative integer.");
      }
      if (sideData !== void 0 && (typeof sideData !== "object" || !sideData)) {
        throw new TypeError("sideData, when provided, must be an object.");
      }
      if (sideData?.alpha !== void 0 && !(sideData.alpha instanceof Uint8Array)) {
        throw new TypeError("sideData.alpha, when provided, must be a Uint8Array.");
      }
      if (sideData?.alphaByteLength !== void 0 && (!Number.isInteger(sideData.alphaByteLength) || sideData.alphaByteLength < 0)) {
        throw new TypeError("sideData.alphaByteLength, when provided, must be a non-negative integer.");
      }
      this.byteLength = byteLength;
      this.sideData = sideData ?? {};
      if (this.sideData.alpha && this.sideData.alphaByteLength === void 0) {
        this.sideData.alphaByteLength = this.sideData.alpha.byteLength;
      }
    }
    /**
     * If this packet is a metadata-only packet. Metadata-only packets don't contain their packet data. They are the
     * result of retrieving packets with {@link PacketRetrievalOptions.metadataOnly} set to `true`.
     */
    get isMetadataOnly() {
      return this.data === PLACEHOLDER_DATA;
    }
    /** The timestamp of this packet in microseconds. */
    get microsecondTimestamp() {
      return Math.trunc(SECOND_TO_MICROSECOND_FACTOR * this.timestamp);
    }
    /** The duration of this packet in microseconds. */
    get microsecondDuration() {
      return Math.trunc(SECOND_TO_MICROSECOND_FACTOR * this.duration);
    }
    /** Converts this packet to an
     * [`EncodedVideoChunk`](https://developer.mozilla.org/en-US/docs/Web/API/EncodedVideoChunk) for use with the
     * WebCodecs API. */
    toEncodedVideoChunk() {
      if (this.isMetadataOnly) {
        throw new TypeError("Metadata-only packets cannot be converted to a video chunk.");
      }
      if (typeof EncodedVideoChunk === "undefined") {
        throw new Error("Your browser does not support EncodedVideoChunk.");
      }
      return new EncodedVideoChunk({
        data: this.data,
        type: this.type,
        timestamp: this.microsecondTimestamp,
        duration: this.microsecondDuration
      });
    }
    /**
     * Converts this packet to an
     * [`EncodedVideoChunk`](https://developer.mozilla.org/en-US/docs/Web/API/EncodedVideoChunk) for use with the
     * WebCodecs API, using the alpha side data instead of the color data. Throws if no alpha side data is defined.
     */
    alphaToEncodedVideoChunk(type = this.type) {
      if (!this.sideData.alpha) {
        throw new TypeError("This packet does not contain alpha side data.");
      }
      if (this.isMetadataOnly) {
        throw new TypeError("Metadata-only packets cannot be converted to a video chunk.");
      }
      if (typeof EncodedVideoChunk === "undefined") {
        throw new Error("Your browser does not support EncodedVideoChunk.");
      }
      return new EncodedVideoChunk({
        data: this.sideData.alpha,
        type,
        timestamp: this.microsecondTimestamp,
        duration: this.microsecondDuration
      });
    }
    /** Converts this packet to an
     * [`EncodedAudioChunk`](https://developer.mozilla.org/en-US/docs/Web/API/EncodedAudioChunk) for use with the
     * WebCodecs API. */
    toEncodedAudioChunk() {
      if (this.isMetadataOnly) {
        throw new TypeError("Metadata-only packets cannot be converted to an audio chunk.");
      }
      if (typeof EncodedAudioChunk === "undefined") {
        throw new Error("Your browser does not support EncodedAudioChunk.");
      }
      return new EncodedAudioChunk({
        data: this.data,
        type: this.type,
        timestamp: this.microsecondTimestamp,
        duration: this.microsecondDuration
      });
    }
    /**
     * Creates an {@link EncodedPacket} from an
     * [`EncodedVideoChunk`](https://developer.mozilla.org/en-US/docs/Web/API/EncodedVideoChunk) or
     * [`EncodedAudioChunk`](https://developer.mozilla.org/en-US/docs/Web/API/EncodedAudioChunk). This method is useful
     * for converting chunks from the WebCodecs API to `EncodedPacket` instances.
     */
    static fromEncodedChunk(chunk, sideData) {
      if (!(chunk instanceof EncodedVideoChunk || chunk instanceof EncodedAudioChunk)) {
        throw new TypeError("chunk must be an EncodedVideoChunk or EncodedAudioChunk.");
      }
      const data = new Uint8Array(chunk.byteLength);
      chunk.copyTo(data);
      return new _EncodedPacket(
        data,
        chunk.type,
        chunk.timestamp / 1e6,
        (chunk.duration ?? 0) / 1e6,
        void 0,
        void 0,
        sideData
      );
    }
    /** Clones this packet while optionally modifying the new packet's data. */
    clone(options) {
      if (options !== void 0 && (typeof options !== "object" || options === null)) {
        throw new TypeError("options, when provided, must be an object.");
      }
      if (options?.data !== void 0 && !(options.data instanceof Uint8Array)) {
        throw new TypeError("options.data, when provided, must be a Uint8Array.");
      }
      if (options?.type !== void 0 && options.type !== "key" && options.type !== "delta") {
        throw new TypeError('options.type, when provided, must be either "key" or "delta".');
      }
      if (options?.timestamp !== void 0 && !Number.isFinite(options.timestamp)) {
        throw new TypeError("options.timestamp, when provided, must be a number.");
      }
      if (options?.duration !== void 0 && !Number.isFinite(options.duration)) {
        throw new TypeError("options.duration, when provided, must be a number.");
      }
      if (options?.sequenceNumber !== void 0 && !Number.isFinite(options.sequenceNumber)) {
        throw new TypeError("options.sequenceNumber, when provided, must be a number.");
      }
      if (options?.sideData !== void 0 && (typeof options.sideData !== "object" || options.sideData === null)) {
        throw new TypeError("options.sideData, when provided, must be an object.");
      }
      return new _EncodedPacket(
        options?.data ?? this.data,
        options?.type ?? this.type,
        options?.timestamp ?? this.timestamp,
        options?.duration ?? this.duration,
        options?.sequenceNumber ?? this.sequenceNumber,
        this.byteLength,
        options?.sideData ?? this.sideData
      );
    }
  };

  // src/isobmff/isobmff-misc.ts
  var buildIsobmffMimeType = (info) => {
    const base = info.hasVideo ? "video/" : info.hasAudio ? "audio/" : "application/";
    let string = base + (info.isQuickTime ? "quicktime" : "mp4");
    if (info.codecStrings.length > 0) {
      const uniqueCodecMimeTypes = [...new Set(info.codecStrings)];
      string += `; codecs="${uniqueCodecMimeTypes.join(", ")}"`;
    }
    return string;
  };
  var parsePsshBoxContents = (contents) => {
    const view2 = toDataView(contents);
    let pos = 0;
    const version = view2.getUint8(pos);
    pos += 1;
    pos += 3;
    const systemId = bytesToHexString(contents.subarray(pos, pos + 16));
    pos += 16;
    let keyIds = null;
    if (version > 0) {
      const kidCount = view2.getUint32(pos);
      pos += 4;
      if (kidCount > 0) {
        keyIds = [];
        for (let i = 0; i < kidCount; i++) {
          keyIds.push(bytesToHexString(contents.subarray(pos, pos + 16)));
          pos += 16;
        }
      }
    }
    const dataSize = view2.getUint32(pos);
    pos += 4;
    return {
      systemId,
      keyIds,
      data: contents.slice(pos, pos + dataSize)
    };
  };
  var psshBoxesAreEqual = (a, b) => a.systemId === b.systemId && uint8ArraysAreEqual(a.data, b.data);

  // src/isobmff/isobmff-reader.ts
  var MIN_BOX_HEADER_SIZE = 8;
  var MAX_BOX_HEADER_SIZE = 16;
  var readBoxHeader = (slice) => {
    let totalSize = readU32Be(slice);
    const name = readAscii(slice, 4);
    let headerSize = 8;
    const hasLargeSize = totalSize === 1;
    if (hasLargeSize) {
      totalSize = readU64Be(slice);
      headerSize = 16;
    }
    const contentSize = totalSize - headerSize;
    if (contentSize < 0) {
      return null;
    }
    return { name, totalSize, headerSize, contentSize };
  };
  var readFixed_16_16 = (slice) => {
    return readI32Be(slice) / 65536;
  };
  var readFixed_2_30 = (slice) => {
    return readI32Be(slice) / 1073741824;
  };
  var readIsomVariableInteger = (slice) => {
    let result = 0;
    for (let i = 0; i < 4; i++) {
      result <<= 7;
      const nextByte = readU8(slice);
      result |= nextByte & 127;
      if ((nextByte & 128) === 0) {
        break;
      }
    }
    return result;
  };
  var readMetadataStringShort = (slice) => {
    let stringLength = readU16Be(slice);
    slice.skip(2);
    stringLength = Math.min(stringLength, slice.remainingLength);
    return textDecoder.decode(readBytes(slice, stringLength));
  };
  var readDataBox = (slice) => {
    const header = readBoxHeader(slice);
    if (!header || header.name !== "data") {
      return null;
    }
    if (slice.remainingLength < 8) {
      return null;
    }
    const typeIndicator = readU32Be(slice);
    slice.skip(4);
    const data = readBytes(slice, header.contentSize - 8);
    switch (typeIndicator) {
      case 1:
        return textDecoder.decode(data);
      // UTF-8
      case 2:
        return new TextDecoder("utf-16be").decode(data);
      // UTF-16-BE
      case 13:
        return new RichImageData(data, "image/jpeg");
      case 14:
        return new RichImageData(data, "image/png");
      case 27:
        return new RichImageData(data, "image/bmp");
      default:
        return data;
    }
  };

  // src/aes.ts
  var AES_128_BLOCK_SIZE = 16;
  var Te4 = new Uint32Array(256);
  var Td0 = new Uint32Array(256);
  var Td1 = new Uint32Array(256);
  var Td2 = new Uint32Array(256);
  var Td3 = new Uint32Array(256);
  var Td4 = new Uint32Array(256);
  var rcon = new Uint32Array(10);
  var tablesGenerated = false;
  var generateAesTables = () => {
    const sbox = new Uint8Array(256);
    const log = new Uint8Array(256);
    const pow = new Uint8Array(256);
    for (let i = 0, p = 1; i < 256; i++) {
      pow[i] = p;
      log[p] = i;
      p = p ^ p << 1 ^ (p & 128 ? 283 : 0);
    }
    const mul = (a, b) => a && b ? pow[(log[a] + log[b]) % 255] : 0;
    sbox[0] = 99;
    for (let i = 1; i < 256; i++) {
      const x = pow[255 - log[i]];
      let s = x ^ x << 1 ^ x << 2 ^ x << 3 ^ x << 4;
      s = s >>> 8 ^ s & 255 ^ 99;
      sbox[i] = s;
    }
    for (let i = 0; i < 256; i++) {
      const s = sbox[i];
      const is = sbox.indexOf(i);
      Te4[i] = s << 24 | s << 16 | s << 8 | s;
      Td4[i] = is << 24 | is << 16 | is << 8 | is;
      const b0 = mul(is, 14);
      const b1 = mul(is, 9);
      const b2 = mul(is, 13);
      const b3 = mul(is, 11);
      const w = b0 << 24 | b1 << 16 | b2 << 8 | b3;
      Td0[i] = w;
      Td1[i] = w >>> 8 | w << 24;
      Td2[i] = w >>> 16 | w << 16;
      Td3[i] = w >>> 24 | w << 8;
    }
    let r = 1;
    for (let i = 0; i < 10; i++) {
      rcon[i] = r << 24;
      r = r << 1 ^ (r & 128 ? 283 : 0);
    }
    tablesGenerated = true;
  };
  var Aes128CbcContext = class {
    constructor() {
      this.roundkey = new Uint32Array(44);
      this.iv = new Uint32Array(AES_128_BLOCK_SIZE / Uint32Array.BYTES_PER_ELEMENT);
      this.in = new Uint8Array(AES_128_BLOCK_SIZE);
      this.out = new Uint8Array(AES_128_BLOCK_SIZE);
      this.inView = new DataView(this.in.buffer);
      this.outView = new DataView(this.out.buffer);
    }
    init({ key, iv }) {
      assert(key.byteLength === 16);
      assert(iv.byteLength === 16);
      if (!tablesGenerated) {
        generateAesTables();
      }
      const keyView = new DataView(key.buffer, key.byteOffset, key.byteLength);
      const ivView = new DataView(iv.buffer, iv.byteOffset, iv.byteLength);
      this.roundkey[0] = keyView.getUint32(0, false);
      this.roundkey[1] = keyView.getUint32(4, false);
      this.roundkey[2] = keyView.getUint32(8, false);
      this.roundkey[3] = keyView.getUint32(12, false);
      this.iv[0] = ivView.getUint32(0, false);
      this.iv[1] = ivView.getUint32(4, false);
      this.iv[2] = ivView.getUint32(8, false);
      this.iv[3] = ivView.getUint32(12, false);
      for (let index = 4; index < 44; index += 4) {
        const temp = this.roundkey[index - 1];
        this.roundkey[index] = this.roundkey[index - 4] ^ Te4[temp >>> 16 & 255] & 4278190080 ^ Te4[temp >>> 8 & 255] & 16711680 ^ Te4[temp >>> 0 & 255] & 65280 ^ Te4[temp >>> 24 & 255] & 255 ^ rcon[index / 4 - 1];
        this.roundkey[index + 1] = this.roundkey[index - 3] ^ this.roundkey[index];
        this.roundkey[index + 2] = this.roundkey[index - 2] ^ this.roundkey[index + 1];
        this.roundkey[index + 3] = this.roundkey[index - 1] ^ this.roundkey[index + 2];
      }
      for (let i = 0, j = 40; i < j; i += 4, j -= 4) {
        for (let k = 0; k < 4; k++) {
          const temp = this.roundkey[i + k];
          this.roundkey[i + k] = this.roundkey[j + k];
          this.roundkey[j + k] = temp;
        }
      }
      for (let index = 4; index < 40; index += 4) {
        for (let k = 0; k < 4; k++) {
          const rk = this.roundkey[index + k];
          this.roundkey[index + k] = Td0[Te4[rk >>> 24 & 255] & 255] ^ Td1[Te4[rk >>> 16 & 255] & 255] ^ Td2[Te4[rk >>> 8 & 255] & 255] ^ Td3[Te4[rk >>> 0 & 255] & 255];
        }
      }
    }
    decrypt() {
      let s0 = this.inView.getUint32(0, false) ^ this.roundkey[0];
      let s1 = this.inView.getUint32(4, false) ^ this.roundkey[1];
      let s2 = this.inView.getUint32(8, false) ^ this.roundkey[2];
      let s3 = this.inView.getUint32(12, false) ^ this.roundkey[3];
      const temp0 = this.inView.getUint32(0, false);
      const temp1 = this.inView.getUint32(4, false);
      const temp2 = this.inView.getUint32(8, false);
      const temp3 = this.inView.getUint32(12, false);
      let t0, t1, t2, t3;
      for (let round = 1; round < 10; round++) {
        const offset = round * 4;
        t0 = Td0[s0 >>> 24] ^ Td1[s3 >>> 16 & 255] ^ Td2[s2 >>> 8 & 255] ^ Td3[s1 & 255] ^ this.roundkey[offset];
        t1 = Td0[s1 >>> 24] ^ Td1[s0 >>> 16 & 255] ^ Td2[s3 >>> 8 & 255] ^ Td3[s2 & 255] ^ this.roundkey[offset + 1];
        t2 = Td0[s2 >>> 24] ^ Td1[s1 >>> 16 & 255] ^ Td2[s0 >>> 8 & 255] ^ Td3[s3 & 255] ^ this.roundkey[offset + 2];
        t3 = Td0[s3 >>> 24] ^ Td1[s2 >>> 16 & 255] ^ Td2[s1 >>> 8 & 255] ^ Td3[s0 & 255] ^ this.roundkey[offset + 3];
        s0 = t0;
        s1 = t1;
        s2 = t2;
        s3 = t3;
      }
      const f0 = Td4[s0 >>> 24 & 255] & 4278190080 ^ Td4[s3 >>> 16 & 255] & 16711680 ^ Td4[s2 >>> 8 & 255] & 65280 ^ Td4[s1 >>> 0 & 255] & 255 ^ this.roundkey[40];
      const f1 = Td4[s1 >>> 24 & 255] & 4278190080 ^ Td4[s0 >>> 16 & 255] & 16711680 ^ Td4[s3 >>> 8 & 255] & 65280 ^ Td4[s2 >>> 0 & 255] & 255 ^ this.roundkey[41];
      const f2 = Td4[s2 >>> 24 & 255] & 4278190080 ^ Td4[s1 >>> 16 & 255] & 16711680 ^ Td4[s0 >>> 8 & 255] & 65280 ^ Td4[s3 >>> 0 & 255] & 255 ^ this.roundkey[42];
      const f3 = Td4[s3 >>> 24 & 255] & 4278190080 ^ Td4[s2 >>> 16 & 255] & 16711680 ^ Td4[s1 >>> 8 & 255] & 65280 ^ Td4[s0 >>> 0 & 255] & 255 ^ this.roundkey[43];
      this.outView.setUint32(0, f0 ^ this.iv[0], false);
      this.outView.setUint32(4, f1 ^ this.iv[1], false);
      this.outView.setUint32(8, f2 ^ this.iv[2], false);
      this.outView.setUint32(12, f3 ^ this.iv[3], false);
      this.iv[0] = temp0;
      this.iv[1] = temp1;
      this.iv[2] = temp2;
      this.iv[3] = temp3;
    }
  };
  var createAes128CbcDecryptStream = (reader, getInit, close) => {
    let initted = false;
    let pos = 0;
    const CHUNK_SIZE = 2 ** 16;
    const BLOCK_SIZE = 16;
    const aesContext = new Aes128CbcContext();
    return new ReadableStream({
      pull: async (controller) => {
        if (!initted) {
          aesContext.init(await getInit());
          initted = true;
        }
        const requestedLength = CHUNK_SIZE + BLOCK_SIZE;
        let nextSlice = reader.requestSliceRange(pos, 0, requestedLength);
        if (nextSlice instanceof Promise) nextSlice = await nextSlice;
        if (!nextSlice || nextSlice.length === 0) {
          throw new Error("Invalid ciphertext.");
        }
        const sliceLength = nextSlice.length;
        if (sliceLength % 16 !== 0) {
          throw new Error("Invalid ciphertext.");
        }
        const bytesToRead = sliceLength === requestedLength ? sliceLength - BLOCK_SIZE : sliceLength;
        const input = readBytes(nextSlice, bytesToRead);
        const output = new Uint8Array(bytesToRead);
        for (let i = 0; i < bytesToRead; i += 16) {
          aesContext.in.set(input.subarray(i, i + 16));
          aesContext.decrypt();
          output.set(aesContext.out, i);
        }
        if (bytesToRead < sliceLength) {
          controller.enqueue(output);
          pos += bytesToRead;
        } else {
          const paddingLength = output[bytesToRead - 1];
          if (paddingLength === 0 || paddingLength > 16) {
            throw new Error("Invalid PKCS#7 padding. Incorrect key or corrupted data.");
          }
          const trimmedOutput = output.subarray(0, bytesToRead - paddingLength);
          controller.enqueue(trimmedOutput);
          controller.close();
          close();
        }
      },
      cancel: () => {
        close();
      }
    });
  };

  // src/isobmff/isobmff-demuxer.ts
  var IsobmffDemuxer = class _IsobmffDemuxer extends Demuxer {
    constructor(input) {
      super(input);
      this.moovSlice = null;
      this.currentTrack = null;
      this.tracks = [];
      this.metadataPromise = null;
      this.movieTimescale = -1;
      this.movieDurationInTimescale = -1;
      this.isQuickTime = false;
      this.metadataTags = {};
      this.currentMetadataKeys = null;
      this.isFragmented = false;
      this.fragmentTrackDefaults = [];
      this.psshBoxes = [];
      this.currentFragment = null;
      /**
       * Caches the last fragment that was read. Based on the assumption that there will be multiple reads to the
       * same fragment in quick succession.
       */
      this.lastReadFragment = null;
      this.decryptionKeyCache = /* @__PURE__ */ new Map();
      this.reader = input._reader;
    }
    async getTrackBackings() {
      await this.readMetadata();
      return this.tracks.map((track) => track.trackBacking);
    }
    async getMimeType() {
      await this.readMetadata();
      const backings = await this.getTrackBackings();
      const codecStrings = await Promise.all(backings.map(
        (x) => x.getDecoderConfig().then((c) => c?.codec ?? null)
      ));
      return buildIsobmffMimeType({
        isQuickTime: this.isQuickTime,
        hasVideo: this.tracks.some((x) => x.info?.type === "video"),
        hasAudio: this.tracks.some((x) => x.info?.type === "audio"),
        codecStrings: codecStrings.filter(Boolean)
      });
    }
    async getMetadataTags() {
      await this.readMetadata();
      return this.metadataTags;
    }
    readMetadata() {
      return this.metadataPromise ??= (async () => {
        let currentPos = 0;
        let lookForMfraBox = false;
        let foundMovieBoxes = false;
        while (true) {
          let slice = this.reader.requestSliceRange(currentPos, MIN_BOX_HEADER_SIZE, MAX_BOX_HEADER_SIZE);
          if (slice instanceof Promise) slice = await slice;
          if (!slice) break;
          const startPos = currentPos;
          const boxInfo = readBoxHeader(slice);
          if (!boxInfo) {
            break;
          }
          if (boxInfo.name === "ftyp" || boxInfo.name === "styp") {
            const majorBrand = readAscii(slice, 4);
            this.isQuickTime = majorBrand === "qt  ";
          } else if (boxInfo.name === "moov") {
            let moovSlice = this.reader.requestSlice(slice.filePos, boxInfo.contentSize);
            if (moovSlice instanceof Promise) moovSlice = await moovSlice;
            if (!moovSlice) break;
            this.moovSlice = moovSlice;
            this.readContiguousBoxes(this.moovSlice);
            for (const track of this.tracks) {
              const previousSegmentDurationsInSeconds = track.editListPreviousSegmentDurations / this.movieTimescale;
              track.editListOffset -= Math.round(previousSegmentDurationsInSeconds * track.timescale);
            }
            lookForMfraBox = this.isFragmented && this.reader.fileSize !== null && this.reader.fileSize > startPos + boxInfo.totalSize;
            foundMovieBoxes = true;
            break;
          } else if (boxInfo.name === "moof") {
            if (!this.input._initInput) {
              throw new Error(
                '"moof" box encountered with no "moov" box present; this file is likely a Segment as described in ISO/IEC 14496-12 Section 8.16. A separate init file that contains a "moov" box is required to read this file, please provide it using InputOptions.initInput.'
              );
            }
            await this.copyMetadataFromInitInput(this.input._initInput);
            lookForMfraBox = false;
            foundMovieBoxes = true;
            break;
          }
          currentPos = startPos + boxInfo.totalSize;
        }
        if (!foundMovieBoxes && this.input._initInput) {
          await this.copyMetadataFromInitInput(this.input._initInput);
        }
        if (lookForMfraBox) {
          assert(this.reader.fileSize !== null);
          let lastWordSlice = this.reader.requestSlice(this.reader.fileSize - 4, 4);
          if (lastWordSlice instanceof Promise) lastWordSlice = await lastWordSlice;
          assert(lastWordSlice);
          const lastWord = readU32Be(lastWordSlice);
          const potentialMfraPos = this.reader.fileSize - lastWord;
          if (potentialMfraPos >= 0 && potentialMfraPos <= this.reader.fileSize - MAX_BOX_HEADER_SIZE) {
            let mfraHeaderSlice = this.reader.requestSliceRange(
              potentialMfraPos,
              MIN_BOX_HEADER_SIZE,
              MAX_BOX_HEADER_SIZE
            );
            if (mfraHeaderSlice instanceof Promise) mfraHeaderSlice = await mfraHeaderSlice;
            if (mfraHeaderSlice) {
              const boxInfo = readBoxHeader(mfraHeaderSlice);
              if (boxInfo && boxInfo.name === "mfra") {
                let mfraSlice = this.reader.requestSlice(mfraHeaderSlice.filePos, boxInfo.contentSize);
                if (mfraSlice instanceof Promise) mfraSlice = await mfraSlice;
                if (mfraSlice) {
                  this.readContiguousBoxes(mfraSlice);
                }
              }
            }
          }
        }
      })();
    }
    async copyMetadataFromInitInput(initInput) {
      const initDemuxer = await initInput._getDemuxer();
      if (initDemuxer.constructor !== _IsobmffDemuxer) {
        throw new Error("Init input must match the input's format.");
      }
      await initDemuxer.readMetadata();
      this.movieTimescale = initDemuxer.movieTimescale;
      this.movieDurationInTimescale = initDemuxer.movieDurationInTimescale;
      this.metadataTags = initDemuxer.metadataTags;
      this.isFragmented = true;
      this.fragmentTrackDefaults = initDemuxer.fragmentTrackDefaults;
      this.psshBoxes = initDemuxer.psshBoxes;
      for (const foreignTrack of initDemuxer.tracks) {
        const track = {
          id: foreignTrack.id,
          demuxer: this,
          trackBacking: null,
          disposition: foreignTrack.disposition,
          timescale: foreignTrack.timescale,
          durationInMediaTimescale: foreignTrack.durationInMediaTimescale,
          durationInMovieTimescale: foreignTrack.durationInMovieTimescale,
          rotation: foreignTrack.rotation,
          internalCodecId: foreignTrack.internalCodecId,
          name: foreignTrack.name,
          languageCode: foreignTrack.languageCode,
          sampleTableByteOffset: null,
          sampleTable: null,
          fragmentLookupTable: [],
          currentFragmentState: null,
          fragmentPositionCache: [],
          editListPreviousSegmentDurations: foreignTrack.editListPreviousSegmentDurations,
          editListOffset: foreignTrack.editListOffset,
          encryptionInfo: foreignTrack.encryptionInfo,
          encryptionAuxInfo: null,
          frmaCodecString: null,
          info: foreignTrack.info
        };
        if (foreignTrack.trackBacking) {
          assert(track.info);
          if (track.info.type === "video" && track.info.width !== -1) {
            const videoTrack = track;
            track.trackBacking = new IsobmffVideoTrackBacking(videoTrack);
            this.tracks.push(track);
          } else if (track.info.type === "audio" && track.info.numberOfChannels !== -1) {
            const audioTrack = track;
            track.trackBacking = new IsobmffAudioTrackBacking(audioTrack);
            this.tracks.push(track);
          }
        } else {
        }
      }
    }
    getSampleTableForTrack(internalTrack) {
      if (internalTrack.sampleTable) {
        return internalTrack.sampleTable;
      }
      const sampleTable = {
        sampleTimingEntries: [],
        sampleCompositionTimeOffsets: [],
        sampleSizes: [],
        keySampleIndices: null,
        chunkOffsets: [],
        sampleToChunk: [],
        presentationTimestamps: null,
        presentationTimestampIndexMap: null
      };
      internalTrack.sampleTable = sampleTable;
      if (internalTrack.sampleTableByteOffset === null) {
        return sampleTable;
      }
      assert(this.moovSlice);
      const stblContainerSlice = this.moovSlice.slice(internalTrack.sampleTableByteOffset);
      this.currentTrack = internalTrack;
      this.traverseBox(stblContainerSlice);
      this.currentTrack = null;
      const isPcmCodec = internalTrack.info?.type === "audio" && internalTrack.info.codec && PCM_AUDIO_CODECS.includes(internalTrack.info.codec);
      if (isPcmCodec && sampleTable.sampleCompositionTimeOffsets.length === 0) {
        assert(internalTrack.info?.type === "audio");
        const pcmInfo = parsePcmCodec(internalTrack.info.codec);
        const newSampleTimingEntries = [];
        const newSampleSizes = [];
        for (let i = 0; i < sampleTable.sampleToChunk.length; i++) {
          const chunkEntry = sampleTable.sampleToChunk[i];
          const nextEntry = sampleTable.sampleToChunk[i + 1];
          const chunkCount = (nextEntry ? nextEntry.startChunkIndex : sampleTable.chunkOffsets.length) - chunkEntry.startChunkIndex;
          for (let j = 0; j < chunkCount; j++) {
            const startSampleIndex = chunkEntry.startSampleIndex + j * chunkEntry.samplesPerChunk;
            const endSampleIndex = startSampleIndex + chunkEntry.samplesPerChunk;
            const startTimingEntryIndex = binarySearchLessOrEqual(
              sampleTable.sampleTimingEntries,
              startSampleIndex,
              (x) => x.startIndex
            );
            const startTimingEntry = sampleTable.sampleTimingEntries[startTimingEntryIndex];
            const endTimingEntryIndex = binarySearchLessOrEqual(
              sampleTable.sampleTimingEntries,
              endSampleIndex,
              (x) => x.startIndex
            );
            const endTimingEntry = sampleTable.sampleTimingEntries[endTimingEntryIndex];
            const firstSampleTimestamp = startTimingEntry.startDecodeTimestamp + (startSampleIndex - startTimingEntry.startIndex) * startTimingEntry.delta;
            const lastSampleTimestamp = endTimingEntry.startDecodeTimestamp + (endSampleIndex - endTimingEntry.startIndex) * endTimingEntry.delta;
            const delta = lastSampleTimestamp - firstSampleTimestamp;
            const lastSampleTimingEntry = last(newSampleTimingEntries);
            if (lastSampleTimingEntry && lastSampleTimingEntry.delta === delta) {
              lastSampleTimingEntry.count++;
            } else {
              newSampleTimingEntries.push({
                startIndex: chunkEntry.startChunkIndex + j,
                startDecodeTimestamp: firstSampleTimestamp,
                count: 1,
                delta
              });
            }
            const chunkSize = chunkEntry.samplesPerChunk * pcmInfo.sampleSize * internalTrack.info.numberOfChannels;
            newSampleSizes.push(chunkSize);
          }
          chunkEntry.startSampleIndex = chunkEntry.startChunkIndex;
          chunkEntry.samplesPerChunk = 1;
        }
        sampleTable.sampleTimingEntries = newSampleTimingEntries;
        sampleTable.sampleSizes = newSampleSizes;
      }
      if (sampleTable.sampleCompositionTimeOffsets.length > 0) {
        sampleTable.presentationTimestamps = [];
        for (const entry of sampleTable.sampleTimingEntries) {
          for (let i = 0; i < entry.count; i++) {
            sampleTable.presentationTimestamps.push({
              presentationTimestamp: entry.startDecodeTimestamp + i * entry.delta,
              sampleIndex: entry.startIndex + i
            });
          }
        }
        for (const entry of sampleTable.sampleCompositionTimeOffsets) {
          for (let i = 0; i < entry.count; i++) {
            const sampleIndex = entry.startIndex + i;
            const sample = sampleTable.presentationTimestamps[sampleIndex];
            if (!sample) {
              continue;
            }
            sample.presentationTimestamp += entry.offset;
          }
        }
        sampleTable.presentationTimestamps.sort((a, b) => a.presentationTimestamp - b.presentationTimestamp);
        sampleTable.presentationTimestampIndexMap = Array(sampleTable.presentationTimestamps.length).fill(-1);
        for (let i = 0; i < sampleTable.presentationTimestamps.length; i++) {
          sampleTable.presentationTimestampIndexMap[sampleTable.presentationTimestamps[i].sampleIndex] = i;
        }
      } else {
      }
      return sampleTable;
    }
    async readFragment(startPos) {
      if (this.lastReadFragment?.moofOffset === startPos) {
        return this.lastReadFragment;
      }
      let headerSlice = this.reader.requestSliceRange(startPos, MIN_BOX_HEADER_SIZE, MAX_BOX_HEADER_SIZE);
      if (headerSlice instanceof Promise) headerSlice = await headerSlice;
      assert(headerSlice);
      const moofBoxInfo = readBoxHeader(headerSlice);
      assert(moofBoxInfo?.name === "moof");
      let entireSlice = this.reader.requestSlice(startPos, moofBoxInfo.totalSize);
      if (entireSlice instanceof Promise) entireSlice = await entireSlice;
      assert(entireSlice);
      this.traverseBox(entireSlice);
      const fragment = this.lastReadFragment;
      assert(fragment && fragment.moofOffset === startPos);
      for (const [, trackData] of fragment.trackData) {
        const track = trackData.track;
        const { fragmentPositionCache } = track;
        if (!trackData.startTimestampIsFinal) {
          const lookupEntry = track.fragmentLookupTable.find((x) => x.moofOffset === fragment.moofOffset);
          if (lookupEntry) {
            offsetFragmentTrackDataByTimestamp(trackData, lookupEntry.timestamp);
          } else {
            const lastCacheIndex = binarySearchLessOrEqual(
              fragmentPositionCache,
              fragment.moofOffset - 1,
              (x) => x.moofOffset
            );
            if (lastCacheIndex !== -1) {
              const lastCache = fragmentPositionCache[lastCacheIndex];
              offsetFragmentTrackDataByTimestamp(trackData, lastCache.endTimestamp);
            } else {
            }
          }
          trackData.startTimestampIsFinal = true;
        }
        const insertionIndex = binarySearchLessOrEqual(
          fragmentPositionCache,
          trackData.startTimestamp,
          (x) => x.startTimestamp
        );
        if (insertionIndex === -1 || fragmentPositionCache[insertionIndex].moofOffset !== fragment.moofOffset) {
          fragmentPositionCache.splice(insertionIndex + 1, 0, {
            moofOffset: fragment.moofOffset,
            startTimestamp: trackData.startTimestamp,
            endTimestamp: trackData.endTimestamp
          });
        }
        if (trackData.encryptionAuxInfo && track.encryptionInfo) {
          const entries = await resolveEncryptionAuxInfo(
            this.reader,
            track.encryptionInfo,
            trackData.encryptionAuxInfo
          );
          for (let i = 0; i < Math.min(trackData.samples.length, entries.length); i++) {
            const entry = entries[i];
            trackData.samples[i].encryption = entry;
          }
        }
      }
      return fragment;
    }
    readContiguousBoxes(slice) {
      const startIndex = slice.filePos;
      while (slice.filePos - startIndex <= slice.length - MIN_BOX_HEADER_SIZE) {
        const foundBox = this.traverseBox(slice);
        if (!foundBox) {
          break;
        }
      }
    }
    // eslint-disable-next-line @stylistic/generator-star-spacing
    *iterateContiguousBoxes(slice) {
      const startIndex = slice.filePos;
      while (slice.filePos - startIndex <= slice.length - MIN_BOX_HEADER_SIZE) {
        const startPos = slice.filePos;
        const boxInfo = readBoxHeader(slice);
        if (!boxInfo) {
          break;
        }
        yield { boxInfo, slice };
        slice.filePos = startPos + boxInfo.totalSize;
      }
    }
    traverseBox(slice) {
      const startPos = slice.filePos;
      const boxInfo = readBoxHeader(slice);
      if (!boxInfo) {
        return false;
      }
      const contentStartPos = slice.filePos;
      const boxEndPos = startPos + boxInfo.totalSize;
      switch (boxInfo.name) {
        case "mdia":
        case "minf":
        case "dinf":
        case "mfra":
        case "edts":
        case "sinf":
        case "schi":
          {
            this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
          }
          ;
          break;
        case "mvhd":
          {
            const version = readU8(slice);
            slice.skip(3);
            if (version === 1) {
              slice.skip(8 + 8);
              this.movieTimescale = readU32Be(slice);
              this.movieDurationInTimescale = readU64Be(slice);
            } else {
              slice.skip(4 + 4);
              this.movieTimescale = readU32Be(slice);
              this.movieDurationInTimescale = readU32Be(slice);
            }
          }
          ;
          break;
        case "trak":
          {
            const track = {
              id: -1,
              demuxer: this,
              trackBacking: null,
              disposition: {
                ...DEFAULT_TRACK_DISPOSITION,
                primary: false
              },
              info: null,
              timescale: -1,
              durationInMovieTimescale: -1,
              durationInMediaTimescale: -1,
              rotation: 0,
              internalCodecId: null,
              name: null,
              languageCode: UNDETERMINED_LANGUAGE,
              sampleTableByteOffset: -1,
              sampleTable: null,
              fragmentLookupTable: [],
              currentFragmentState: null,
              fragmentPositionCache: [],
              editListPreviousSegmentDurations: 0,
              editListOffset: 0,
              encryptionInfo: null,
              encryptionAuxInfo: null,
              frmaCodecString: null
            };
            this.currentTrack = track;
            this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
            if (track.id !== -1 && track.timescale !== -1 && track.info !== null) {
              if (track.info.type === "video" && track.info.width !== -1) {
                const videoTrack = track;
                track.trackBacking = new IsobmffVideoTrackBacking(videoTrack);
                this.tracks.push(track);
              } else if (track.info.type === "audio" && track.info.numberOfChannels !== -1) {
                const audioTrack = track;
                track.trackBacking = new IsobmffAudioTrackBacking(audioTrack);
                this.tracks.push(track);
              }
            }
            this.currentTrack = null;
          }
          ;
          break;
        case "tkhd":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            const version = readU8(slice);
            const flags = readU24Be(slice);
            const trackEnabled = !!(flags & 1);
            track.disposition.default = trackEnabled;
            if (version === 0) {
              slice.skip(8);
              track.id = readU32Be(slice);
              slice.skip(4);
              track.durationInMovieTimescale = readU32Be(slice);
            } else if (version === 1) {
              slice.skip(16);
              track.id = readU32Be(slice);
              slice.skip(4);
              track.durationInMovieTimescale = readU64Be(slice);
            } else {
              throw new Error(`Incorrect track header version ${version}.`);
            }
            slice.skip(2 * 4 + 2 + 2 + 2 + 2);
            const matrix = [
              readFixed_16_16(slice),
              readFixed_16_16(slice),
              readFixed_2_30(slice),
              readFixed_16_16(slice),
              readFixed_16_16(slice),
              readFixed_2_30(slice),
              readFixed_16_16(slice),
              readFixed_16_16(slice),
              readFixed_2_30(slice)
            ];
            const rotation = normalizeRotation(roundToMultiple(extractRotationFromMatrix(matrix), 90));
            assert(rotation === 0 || rotation === 90 || rotation === 180 || rotation === 270);
            track.rotation = rotation;
          }
          ;
          break;
        case "elst":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            const version = readU8(slice);
            slice.skip(3);
            let relevantEntryFound = false;
            let previousSegmentDurations = 0;
            const entryCount = readU32Be(slice);
            for (let i = 0; i < entryCount; i++) {
              const segmentDuration = version === 1 ? readU64Be(slice) : readU32Be(slice);
              const mediaTime = version === 1 ? readI64Be(slice) : readI32Be(slice);
              const mediaRate = readFixed_16_16(slice);
              if (segmentDuration === 0) {
                continue;
              }
              if (relevantEntryFound) {
                Logging._warn(
                  "Unsupported edit list: multiple edits are not currently supported. Only using first edit."
                );
                break;
              }
              if (mediaTime === -1) {
                previousSegmentDurations += segmentDuration;
                continue;
              }
              if (mediaRate !== 1) {
                Logging._warn("Unsupported edit list entry: media rate must be 1.");
                break;
              }
              track.editListPreviousSegmentDurations = previousSegmentDurations;
              track.editListOffset = mediaTime;
              relevantEntryFound = true;
            }
          }
          ;
          break;
        case "mdhd":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            const version = readU8(slice);
            slice.skip(3);
            if (version === 0) {
              slice.skip(8);
              track.timescale = readU32Be(slice);
              track.durationInMediaTimescale = readU32Be(slice);
            } else if (version === 1) {
              slice.skip(16);
              track.timescale = readU32Be(slice);
              track.durationInMediaTimescale = readU64Be(slice);
            }
            let language = readU16Be(slice);
            if (language > 0) {
              track.languageCode = "";
              for (let i = 0; i < 3; i++) {
                track.languageCode = String.fromCharCode(96 + (language & 31)) + track.languageCode;
                language >>= 5;
              }
              if (!isIso639Dash2LanguageCode(track.languageCode)) {
                track.languageCode = UNDETERMINED_LANGUAGE;
              }
            }
          }
          ;
          break;
        case "hdlr":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            slice.skip(8);
            const handlerType = readAscii(slice, 4);
            if (handlerType === "vide") {
              track.info = {
                type: "video",
                width: -1,
                height: -1,
                squarePixelWidth: -1,
                squarePixelHeight: -1,
                codec: null,
                codecDescription: null,
                colorSpace: null,
                avcType: null,
                avcCodecInfo: null,
                hevcCodecInfo: null,
                vp9CodecInfo: null,
                av1CodecInfo: null,
                proresFormat: null
              };
            } else if (handlerType === "soun") {
              track.info = {
                type: "audio",
                numberOfChannels: -1,
                sampleRate: -1,
                codec: null,
                codecDescription: null,
                aacCodecInfo: null,
                pcmLittleEndian: false,
                pcmSampleSize: null
              };
            }
          }
          ;
          break;
        case "stbl":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            track.sampleTableByteOffset = startPos;
            this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
          }
          ;
          break;
        case "stsd":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (track.info === null || track.sampleTable) {
              break;
            }
            const stsdVersion = readU8(slice);
            slice.skip(3);
            const entries = readU32Be(slice);
            for (let i = 0; i < entries; i++) {
              const sampleBoxStartPos = slice.filePos;
              const sampleBoxInfo = readBoxHeader(slice);
              if (!sampleBoxInfo) {
                break;
              }
              track.internalCodecId = sampleBoxInfo.name;
              const lowercaseBoxName = sampleBoxInfo.name.toLowerCase();
              if (track.info.type === "video") {
                slice.skip(6 * 1 + 2 + 2 + 2 + 3 * 4);
                track.info.width = readU16Be(slice);
                track.info.height = readU16Be(slice);
                track.info.squarePixelWidth = track.info.width;
                track.info.squarePixelHeight = track.info.height;
                slice.skip(4 + 4 + 4 + 2 + 32 + 2 + 2);
                track.frmaCodecString = null;
                this.readContiguousBoxes(
                  slice.slice(
                    slice.filePos,
                    sampleBoxStartPos + sampleBoxInfo.totalSize - slice.filePos
                  )
                );
                const codecName = lowercaseBoxName === "encv" ? track.frmaCodecString : lowercaseBoxName;
                track.frmaCodecString = null;
                if (codecName === "avc1" || codecName === "avc3") {
                  track.info.codec = "avc";
                  track.info.avcType = codecName === "avc1" ? 1 : 3;
                } else if (codecName === "hvc1" || codecName === "hev1") {
                  track.info.codec = "hevc";
                } else if (codecName === "vp08") {
                  track.info.codec = "vp8";
                } else if (codecName === "vp09") {
                  track.info.codec = "vp9";
                } else if (codecName === "av01") {
                  track.info.codec = "av1";
                } else if (PRORES_FOURCCS.includes(lowercaseBoxName)) {
                  track.info.codec = "prores";
                  track.info.proresFormat = lowercaseBoxName;
                } else if (codecName === null) {
                  Logging._warn(`Unknown encrypted video codec due to missing frma box.`);
                } else {
                  Logging._warn(`Unsupported video codec (sample entry type '${sampleBoxInfo.name}').`);
                }
              } else {
                slice.skip(6 * 1 + 2);
                const version = readU16Be(slice);
                slice.skip(3 * 2);
                let channelCount = readU16Be(slice);
                let sampleSize = readU16Be(slice);
                slice.skip(2 * 2);
                let sampleRate = readU32Be(slice) / 65536;
                let lpcmFlags = null;
                if (stsdVersion === 0 && version > 0) {
                  if (version === 1) {
                    slice.skip(4);
                    sampleSize = 8 * readU32Be(slice);
                    slice.skip(2 * 4);
                  } else if (version === 2) {
                    slice.skip(4);
                    sampleRate = readF64Be(slice);
                    channelCount = readU32Be(slice);
                    slice.skip(4);
                    sampleSize = readU32Be(slice);
                    lpcmFlags = readU32Be(slice);
                    slice.skip(2 * 4);
                  }
                }
                track.info.numberOfChannels = channelCount;
                track.info.sampleRate = sampleRate;
                track.frmaCodecString = null;
                this.readContiguousBoxes(
                  slice.slice(
                    slice.filePos,
                    sampleBoxStartPos + sampleBoxInfo.totalSize - slice.filePos
                  )
                );
                const codecName = lowercaseBoxName === "enca" ? track.frmaCodecString : lowercaseBoxName;
                track.frmaCodecString = null;
                if (codecName === "mp4a") {
                } else if (codecName === "opus") {
                  track.info.codec = "opus";
                  track.info.sampleRate = OPUS_SAMPLE_RATE;
                } else if (codecName === "flac") {
                  track.info.codec = "flac";
                } else if (codecName === "ulaw") {
                  track.info.codec = "ulaw";
                } else if (codecName === "alaw") {
                  track.info.codec = "alaw";
                } else if (codecName === "ac-3") {
                  track.info.codec = "ac3";
                } else if (codecName === "ec-3") {
                  track.info.codec = "eac3";
                } else if (codecName === "twos") {
                  if (sampleSize === 8) {
                    track.info.codec = "pcm-s8";
                  } else if (sampleSize === 16) {
                    track.info.codec = track.info.pcmLittleEndian ? "pcm-s16" : "pcm-s16be";
                  } else {
                    Logging._warn(`Unsupported sample size ${sampleSize} for codec 'twos'.`);
                    track.info.codec = null;
                  }
                } else if (codecName === "sowt") {
                  if (sampleSize === 8) {
                    track.info.codec = "pcm-s8";
                  } else if (sampleSize === 16) {
                    track.info.codec = "pcm-s16";
                  } else {
                    Logging._warn(`Unsupported sample size ${sampleSize} for codec 'sowt'.`);
                    track.info.codec = null;
                  }
                } else if (codecName === "raw ") {
                  track.info.codec = "pcm-u8";
                } else if (codecName === "in24") {
                  track.info.codec = track.info.pcmLittleEndian ? "pcm-s24" : "pcm-s24be";
                } else if (codecName === "in32") {
                  track.info.codec = track.info.pcmLittleEndian ? "pcm-s32" : "pcm-s32be";
                } else if (codecName === "fl32") {
                  track.info.codec = track.info.pcmLittleEndian ? "pcm-f32" : "pcm-f32be";
                } else if (codecName === "fl64") {
                  track.info.codec = track.info.pcmLittleEndian ? "pcm-f64" : "pcm-f64be";
                } else if (codecName === "ipcm") {
                  const pcmSampleSize = track.info.pcmSampleSize;
                  if (track.info.pcmLittleEndian) {
                    if (pcmSampleSize === 16) {
                      track.info.codec = "pcm-s16";
                    } else if (pcmSampleSize === 24) {
                      track.info.codec = "pcm-s24";
                    } else if (pcmSampleSize === 32) {
                      track.info.codec = "pcm-s32";
                    } else {
                      Logging._warn(`Invalid ipcm sample size ${pcmSampleSize}.`);
                      track.info.codec = null;
                    }
                  } else {
                    if (pcmSampleSize === 16) {
                      track.info.codec = "pcm-s16be";
                    } else if (pcmSampleSize === 24) {
                      track.info.codec = "pcm-s24be";
                    } else if (pcmSampleSize === 32) {
                      track.info.codec = "pcm-s32be";
                    } else {
                      Logging._warn(`Invalid ipcm sample size ${pcmSampleSize}.`);
                      track.info.codec = null;
                    }
                  }
                } else if (codecName === "fpcm") {
                  const pcmSampleSize = track.info.pcmSampleSize;
                  if (track.info.pcmLittleEndian) {
                    if (pcmSampleSize === 32) {
                      track.info.codec = "pcm-f32";
                    } else if (pcmSampleSize === 64) {
                      track.info.codec = "pcm-f64";
                    } else {
                      Logging._warn(`Invalid fpcm sample size ${pcmSampleSize}.`);
                      track.info.codec = null;
                    }
                  } else {
                    if (pcmSampleSize === 32) {
                      track.info.codec = "pcm-f32be";
                    } else if (pcmSampleSize === 64) {
                      track.info.codec = "pcm-f64be";
                    } else {
                      Logging._warn(`Invalid fpcm sample size ${pcmSampleSize}.`);
                      track.info.codec = null;
                    }
                  }
                } else if (codecName === "lpcm" && lpcmFlags !== null) {
                  const bytesPerSample = sampleSize + 7 >> 3;
                  const isFloat = Boolean(lpcmFlags & 1);
                  const isBigEndian = Boolean(lpcmFlags & 2);
                  const sFlags = lpcmFlags & 4 ? -1 : 0;
                  if (sampleSize > 0 && sampleSize <= 64) {
                    if (isFloat) {
                      if (sampleSize === 32) {
                        track.info.codec = isBigEndian ? "pcm-f32be" : "pcm-f32";
                      }
                    } else {
                      if (sFlags & 1 << bytesPerSample - 1) {
                        if (bytesPerSample === 1) {
                          track.info.codec = "pcm-s8";
                        } else if (bytesPerSample === 2) {
                          track.info.codec = isBigEndian ? "pcm-s16be" : "pcm-s16";
                        } else if (bytesPerSample === 3) {
                          track.info.codec = isBigEndian ? "pcm-s24be" : "pcm-s24";
                        } else if (bytesPerSample === 4) {
                          track.info.codec = isBigEndian ? "pcm-s32be" : "pcm-s32";
                        }
                      } else {
                        if (bytesPerSample === 1) {
                          track.info.codec = "pcm-u8";
                        }
                      }
                    }
                  }
                  if (track.info.codec === null) {
                    Logging._warn("Unsupported PCM format.");
                  }
                } else if (codecName === null) {
                  Logging._warn(`Unknown encrypted audio codec due to missing frma box.`);
                } else {
                  Logging._warn(`Unsupported audio codec (sample entry type '${sampleBoxInfo.name}').`);
                }
              }
              slice.filePos = sampleBoxStartPos + sampleBoxInfo.totalSize;
            }
          }
          ;
          break;
        case "frma":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            const format = readAscii(slice, 4);
            const lowercase = format.toLowerCase();
            track.frmaCodecString = lowercase;
          }
          ;
          break;
        case "schm":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            slice.skip(4);
            const schemeType = readAscii(slice, 4);
            if (schemeType === "cenc" || schemeType === "cens" || schemeType === "cbcs") {
              track.encryptionInfo = {
                scheme: schemeType,
                defaultKid: null,
                defaultIsProtected: null,
                defaultPerSampleIvSize: null,
                defaultConstantIv: null,
                defaultCryptByteBlock: null,
                defaultSkipByteBlock: null
              };
            } else {
              Logging._warn(`Unsupported encryption scheme '${schemeType}'.`);
            }
          }
          ;
          break;
        case "tenc":
          {
            const track = this.currentTrack;
            if (!track || !track.encryptionInfo) {
              break;
            }
            const version = readU8(slice);
            slice.skip(3);
            slice.skip(1);
            const patternByte = readU8(slice);
            if (version > 0) {
              track.encryptionInfo.defaultCryptByteBlock = patternByte >> 4;
              track.encryptionInfo.defaultSkipByteBlock = patternByte & 15;
            } else {
              track.encryptionInfo.defaultCryptByteBlock = 0;
              track.encryptionInfo.defaultSkipByteBlock = 0;
            }
            track.encryptionInfo.defaultIsProtected = readU8(slice) !== 0;
            track.encryptionInfo.defaultPerSampleIvSize = readU8(slice);
            track.encryptionInfo.defaultKid = bytesToHexString(readBytes(slice, 16));
            if (track.encryptionInfo.defaultIsProtected && track.encryptionInfo.defaultPerSampleIvSize === 0) {
              const constantIvSize = readU8(slice);
              const constantIv = new Uint8Array(16);
              constantIv.set(readBytes(slice, constantIvSize), 0);
              track.encryptionInfo.defaultConstantIv = constantIv;
            }
          }
          ;
          break;
        case "avcC":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info);
            track.info.codecDescription = readBytes(slice, boxInfo.contentSize);
          }
          ;
          break;
        case "hvcC":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info);
            track.info.codecDescription = readBytes(slice, boxInfo.contentSize);
          }
          ;
          break;
        case "vpcC":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "video");
            slice.skip(4);
            const profile = readU8(slice);
            const level = readU8(slice);
            const thirdByte = readU8(slice);
            const bitDepth = thirdByte >> 4;
            const chromaSubsampling = thirdByte >> 1 & 7;
            const videoFullRangeFlag = thirdByte & 1;
            const colourPrimaries = readU8(slice);
            const transferCharacteristics = readU8(slice);
            const matrixCoefficients = readU8(slice);
            track.info.vp9CodecInfo = {
              profile,
              level,
              bitDepth,
              chromaSubsampling,
              videoFullRangeFlag,
              colourPrimaries,
              transferCharacteristics,
              matrixCoefficients
            };
          }
          ;
          break;
        case "av1C":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "video");
            slice.skip(1);
            const secondByte = readU8(slice);
            const profile = secondByte >> 5;
            const level = secondByte & 31;
            const thirdByte = readU8(slice);
            const tier = thirdByte >> 7;
            const highBitDepth = thirdByte >> 6 & 1;
            const twelveBit = thirdByte >> 5 & 1;
            const monochrome = thirdByte >> 4 & 1;
            const chromaSubsamplingX = thirdByte >> 3 & 1;
            const chromaSubsamplingY = thirdByte >> 2 & 1;
            const chromaSamplePosition = thirdByte & 3;
            const bitDepth = profile === 2 && highBitDepth ? twelveBit ? 12 : 10 : highBitDepth ? 10 : 8;
            track.info.av1CodecInfo = {
              profile,
              level,
              tier,
              bitDepth,
              monochrome,
              chromaSubsamplingX,
              chromaSubsamplingY,
              chromaSamplePosition
            };
          }
          ;
          break;
        case "colr":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "video");
            const colourType = readAscii(slice, 4);
            if (colourType !== "nclx" && colourType !== "nclc") {
              break;
            }
            const colourPrimaries = readU16Be(slice);
            const transferCharacteristics = readU16Be(slice);
            const matrixCoefficients = readU16Be(slice);
            let fullRange = void 0;
            if (colourType === "nclx") {
              fullRange = Boolean(readU8(slice) & 128);
            }
            track.info.colorSpace = {
              primaries: COLOR_PRIMARIES_MAP_INVERSE[colourPrimaries],
              transfer: TRANSFER_CHARACTERISTICS_MAP_INVERSE[transferCharacteristics],
              matrix: MATRIX_COEFFICIENTS_MAP_INVERSE[matrixCoefficients],
              fullRange
            };
          }
          ;
          break;
        case "pasp":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "video");
            const num = readU32Be(slice);
            const den = readU32Be(slice);
            if (num > 0 && den > 0) {
              if (num > den) {
                track.info.squarePixelWidth = Math.round(track.info.width * num / den);
              } else {
                track.info.squarePixelHeight = Math.round(track.info.height * den / num);
              }
            }
          }
          ;
          break;
        case "wave":
          {
            this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
          }
          ;
          break;
        case "esds":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "audio");
            slice.skip(4);
            const tag = readU8(slice);
            assert(tag === 3);
            readIsomVariableInteger(slice);
            slice.skip(2);
            const mixed = readU8(slice);
            const streamDependenceFlag = (mixed & 128) !== 0;
            const urlFlag = (mixed & 64) !== 0;
            const ocrStreamFlag = (mixed & 32) !== 0;
            if (streamDependenceFlag) {
              slice.skip(2);
            }
            if (urlFlag) {
              const urlLength = readU8(slice);
              slice.skip(urlLength);
            }
            if (ocrStreamFlag) {
              slice.skip(2);
            }
            const decoderConfigTag = readU8(slice);
            assert(decoderConfigTag === 4);
            const decoderConfigDescriptorLength = readIsomVariableInteger(slice);
            const payloadStart = slice.filePos;
            const objectTypeIndication = readU8(slice);
            if (objectTypeIndication === 64 || objectTypeIndication === 103) {
              track.info.codec = "aac";
              track.info.aacCodecInfo = {
                isMpeg2: objectTypeIndication === 103,
                objectType: null
              };
            } else if (objectTypeIndication === 105 || objectTypeIndication === 107) {
              track.info.codec = "mp3";
            } else if (objectTypeIndication === 221) {
              track.info.codec = "vorbis";
            } else {
              Logging._warn(
                `Unsupported audio codec (objectTypeIndication ${objectTypeIndication}) - discarding track.`
              );
            }
            slice.skip(1 + 3 + 4 + 4);
            if (decoderConfigDescriptorLength > slice.filePos - payloadStart) {
              const decoderSpecificInfoTag = readU8(slice);
              assert(decoderSpecificInfoTag === 5);
              const decoderSpecificInfoLength = readIsomVariableInteger(slice);
              track.info.codecDescription = readBytes(slice, decoderSpecificInfoLength);
              if (track.info.codec === "aac") {
                const audioSpecificConfig = parseAacAudioSpecificConfig(track.info.codecDescription);
                if (audioSpecificConfig.numberOfChannels !== null) {
                  track.info.numberOfChannels = audioSpecificConfig.numberOfChannels;
                }
                if (audioSpecificConfig.sampleRate !== null) {
                  track.info.sampleRate = audioSpecificConfig.sampleRate;
                }
              }
            }
          }
          ;
          break;
        case "enda":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "audio");
            track.info.pcmLittleEndian = !!(readU16Be(slice) & 255);
          }
          ;
          break;
        case "pcmC":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "audio");
            slice.skip(1 + 3);
            const formatFlags = readU8(slice);
            track.info.pcmLittleEndian = Boolean(formatFlags & 1);
            track.info.pcmSampleSize = readU8(slice);
          }
          ;
          break;
        case "dOps":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "audio");
            slice.skip(1);
            const outputChannelCount = readU8(slice);
            const preSkip = readU16Be(slice);
            const inputSampleRate = readU32Be(slice);
            const outputGain = readI16Be(slice);
            const channelMappingFamily = readU8(slice);
            let channelMappingTable;
            if (channelMappingFamily !== 0) {
              channelMappingTable = readBytes(slice, 2 + outputChannelCount);
            } else {
              channelMappingTable = new Uint8Array(0);
            }
            const description = new Uint8Array(8 + 1 + 1 + 2 + 4 + 2 + 1 + channelMappingTable.byteLength);
            const view2 = new DataView(description.buffer);
            view2.setUint32(0, 1332770163, false);
            view2.setUint32(4, 1214603620, false);
            view2.setUint8(8, 1);
            view2.setUint8(9, outputChannelCount);
            view2.setUint16(10, preSkip, true);
            view2.setUint32(12, inputSampleRate, true);
            view2.setInt16(16, outputGain, true);
            view2.setUint8(18, channelMappingFamily);
            description.set(channelMappingTable, 19);
            track.info.codecDescription = description;
            track.info.numberOfChannels = outputChannelCount;
          }
          ;
          break;
        case "dfLa":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "audio");
            slice.skip(4);
            const BLOCK_TYPE_MASK = 127;
            const LAST_METADATA_BLOCK_FLAG_MASK = 128;
            const startPos2 = slice.filePos;
            while (slice.filePos < boxEndPos) {
              const flagAndType = readU8(slice);
              const metadataBlockLength = readU24Be(slice);
              const type = flagAndType & BLOCK_TYPE_MASK;
              if (type === 0 /* STREAMINFO */) {
                slice.skip(10);
                const word = readU32Be(slice);
                const sampleRate = word >>> 12;
                const numberOfChannels = (word >> 9 & 7) + 1;
                track.info.sampleRate = sampleRate;
                track.info.numberOfChannels = numberOfChannels;
                slice.skip(20);
              } else {
                slice.skip(metadataBlockLength);
              }
              if (flagAndType & LAST_METADATA_BLOCK_FLAG_MASK) {
                break;
              }
            }
            const endPos = slice.filePos;
            slice.filePos = startPos2;
            const bytes2 = readBytes(slice, endPos - startPos2);
            const description = new Uint8Array(4 + bytes2.byteLength);
            const view2 = new DataView(description.buffer);
            view2.setUint32(0, 1716281667, false);
            description.set(bytes2, 4);
            track.info.codecDescription = description;
          }
          ;
          break;
        case "dac3":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "audio");
            const bytes2 = readBytes(slice, 3);
            const bitstream = new Bitstream(bytes2);
            const fscod = bitstream.readBits(2);
            bitstream.skipBits(5 + 3);
            const acmod = bitstream.readBits(3);
            const lfeon = bitstream.readBits(1);
            if (fscod < 3) {
              track.info.sampleRate = AC3_SAMPLE_RATES[fscod];
            }
            track.info.numberOfChannels = AC3_ACMOD_CHANNEL_COUNTS[acmod] + lfeon;
          }
          ;
          break;
        case "dec3":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.info?.type === "audio");
            const bytes2 = readBytes(slice, boxInfo.contentSize);
            const config = parseEac3Config(bytes2);
            if (!config) {
              Logging._warn("Invalid dec3 box contents, ignoring.");
              break;
            }
            const sampleRate = getEac3SampleRate(config);
            if (sampleRate !== null) {
              track.info.sampleRate = sampleRate;
            }
            track.info.numberOfChannels = getEac3ChannelCount(config);
          }
          ;
          break;
        case "stts":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(4);
            const entryCount = readU32Be(slice);
            let currentIndex = 0;
            let currentTimestamp = 0;
            for (let i = 0; i < entryCount; i++) {
              const sampleCount = readU32Be(slice);
              const sampleDelta = readU32Be(slice);
              track.sampleTable.sampleTimingEntries.push({
                startIndex: currentIndex,
                startDecodeTimestamp: currentTimestamp,
                count: sampleCount,
                delta: sampleDelta
              });
              currentIndex += sampleCount;
              currentTimestamp += sampleCount * sampleDelta;
            }
          }
          ;
          break;
        case "ctts":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(1 + 3);
            const entryCount = readU32Be(slice);
            let sampleIndex = 0;
            for (let i = 0; i < entryCount; i++) {
              const sampleCount = readU32Be(slice);
              const sampleOffset = readI32Be(slice);
              track.sampleTable.sampleCompositionTimeOffsets.push({
                startIndex: sampleIndex,
                count: sampleCount,
                offset: sampleOffset
              });
              sampleIndex += sampleCount;
            }
          }
          ;
          break;
        case "stsz":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(4);
            const sampleSize = readU32Be(slice);
            const sampleCount = readU32Be(slice);
            if (sampleSize === 0) {
              for (let i = 0; i < sampleCount; i++) {
                const sampleSize2 = readU32Be(slice);
                track.sampleTable.sampleSizes.push(sampleSize2);
              }
            } else {
              track.sampleTable.sampleSizes.push(sampleSize);
            }
          }
          ;
          break;
        case "stz2":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(4);
            slice.skip(3);
            const fieldSize = readU8(slice);
            const sampleCount = readU32Be(slice);
            const bytes2 = readBytes(slice, Math.ceil(sampleCount * fieldSize / 8));
            const bitstream = new Bitstream(bytes2);
            for (let i = 0; i < sampleCount; i++) {
              const sampleSize = bitstream.readBits(fieldSize);
              track.sampleTable.sampleSizes.push(sampleSize);
            }
          }
          ;
          break;
        case "stss":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(4);
            track.sampleTable.keySampleIndices = [];
            const entryCount = readU32Be(slice);
            for (let i = 0; i < entryCount; i++) {
              const sampleIndex = readU32Be(slice) - 1;
              track.sampleTable.keySampleIndices.push(sampleIndex);
            }
            if (track.sampleTable.keySampleIndices[0] !== 0) {
              track.sampleTable.keySampleIndices.unshift(0);
            }
          }
          ;
          break;
        case "stsc":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(4);
            const entryCount = readU32Be(slice);
            for (let i = 0; i < entryCount; i++) {
              const startChunkIndex = readU32Be(slice) - 1;
              const samplesPerChunk = readU32Be(slice);
              const sampleDescriptionIndex = readU32Be(slice);
              track.sampleTable.sampleToChunk.push({
                startSampleIndex: -1,
                startChunkIndex,
                samplesPerChunk,
                sampleDescriptionIndex
              });
            }
            let startSampleIndex = 0;
            for (let i = 0; i < track.sampleTable.sampleToChunk.length; i++) {
              track.sampleTable.sampleToChunk[i].startSampleIndex = startSampleIndex;
              if (i < track.sampleTable.sampleToChunk.length - 1) {
                const nextChunk = track.sampleTable.sampleToChunk[i + 1];
                const chunkCount = nextChunk.startChunkIndex - track.sampleTable.sampleToChunk[i].startChunkIndex;
                startSampleIndex += chunkCount * track.sampleTable.sampleToChunk[i].samplesPerChunk;
              }
            }
          }
          ;
          break;
        case "stco":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(4);
            const entryCount = readU32Be(slice);
            for (let i = 0; i < entryCount; i++) {
              const chunkOffset = readU32Be(slice);
              track.sampleTable.chunkOffsets.push(chunkOffset);
            }
          }
          ;
          break;
        case "co64":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            if (!track.sampleTable) {
              break;
            }
            slice.skip(4);
            const entryCount = readU32Be(slice);
            for (let i = 0; i < entryCount; i++) {
              const chunkOffset = readU64Be(slice);
              track.sampleTable.chunkOffsets.push(chunkOffset);
            }
          }
          ;
          break;
        case "mvex":
          {
            this.isFragmented = true;
            this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
          }
          ;
          break;
        case "mehd":
          {
            const version = readU8(slice);
            slice.skip(3);
            const fragmentDuration = version === 1 ? readU64Be(slice) : readU32Be(slice);
            this.movieDurationInTimescale = fragmentDuration;
          }
          ;
          break;
        case "trex":
          {
            slice.skip(4);
            const trackId = readU32Be(slice);
            const defaultSampleDescriptionIndex = readU32Be(slice);
            const defaultSampleDuration = readU32Be(slice);
            const defaultSampleSize = readU32Be(slice);
            const defaultSampleFlags = readU32Be(slice);
            this.fragmentTrackDefaults.push({
              trackId,
              defaultSampleDescriptionIndex,
              defaultSampleDuration,
              defaultSampleSize,
              defaultSampleFlags
            });
          }
          ;
          break;
        case "tfra":
          {
            const version = readU8(slice);
            slice.skip(3);
            const trackId = readU32Be(slice);
            const track = this.tracks.find((x) => x.id === trackId);
            if (!track) {
              break;
            }
            const word = readU32Be(slice);
            const lengthSizeOfTrafNum = (word & 48) >> 4;
            const lengthSizeOfTrunNum = (word & 12) >> 2;
            const lengthSizeOfSampleNum = word & 3;
            const functions = [readU8, readU16Be, readU24Be, readU32Be];
            const readTrafNum = functions[lengthSizeOfTrafNum];
            const readTrunNum = functions[lengthSizeOfTrunNum];
            const readSampleNum = functions[lengthSizeOfSampleNum];
            const numberOfEntries = readU32Be(slice);
            for (let i = 0; i < numberOfEntries; i++) {
              const time = version === 1 ? readU64Be(slice) : readU32Be(slice);
              const moofOffset = version === 1 ? readU64Be(slice) : readU32Be(slice);
              readTrafNum(slice);
              readTrunNum(slice);
              readSampleNum(slice);
              track.fragmentLookupTable.push({
                timestamp: time,
                moofOffset
              });
            }
            track.fragmentLookupTable.sort((a, b) => a.timestamp - b.timestamp);
            for (let i = 0; i < track.fragmentLookupTable.length - 1; i++) {
              const entry1 = track.fragmentLookupTable[i];
              const entry2 = track.fragmentLookupTable[i + 1];
              if (entry1.timestamp === entry2.timestamp) {
                track.fragmentLookupTable.splice(i + 1, 1);
                i--;
              }
            }
          }
          ;
          break;
        case "moof":
          {
            this.currentFragment = {
              moofOffset: startPos,
              moofSize: boxInfo.totalSize,
              implicitBaseDataOffset: startPos,
              trackData: /* @__PURE__ */ new Map(),
              psshBoxes: []
            };
            this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
            this.lastReadFragment = this.currentFragment;
            this.currentFragment = null;
          }
          ;
          break;
        case "traf":
          {
            assert(this.currentFragment);
            this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
            if (this.currentTrack) {
              const trackData = this.currentFragment.trackData.get(this.currentTrack.id);
              cond:
                if (trackData) {
                  if (trackData.samples.length === 0) {
                    this.currentFragment.trackData.delete(this.currentTrack.id);
                    break cond;
                  }
                  trackData.presentationTimestamps = trackData.samples.map((x, i) => ({ presentationTimestamp: x.presentationTimestamp, sampleIndex: i })).sort((a, b) => a.presentationTimestamp - b.presentationTimestamp);
                  for (let i = 0; i < trackData.presentationTimestamps.length; i++) {
                    const currentEntry = trackData.presentationTimestamps[i];
                    const currentSample = trackData.samples[currentEntry.sampleIndex];
                    if (trackData.firstKeyFrameTimestamp === null && currentSample.isKeyFrame) {
                      trackData.firstKeyFrameTimestamp = currentSample.presentationTimestamp;
                    }
                    if (i < trackData.presentationTimestamps.length - 1) {
                      const nextEntry = trackData.presentationTimestamps[i + 1];
                      const duration = nextEntry.presentationTimestamp - currentEntry.presentationTimestamp;
                      currentSample.duration = duration;
                    }
                  }
                  const firstSample = trackData.samples[trackData.presentationTimestamps[0].sampleIndex];
                  const lastSample = trackData.samples[last(trackData.presentationTimestamps).sampleIndex];
                  trackData.startTimestamp = firstSample.presentationTimestamp;
                  trackData.endTimestamp = lastSample.presentationTimestamp + lastSample.duration;
                  const { currentFragmentState } = this.currentTrack;
                  assert(currentFragmentState);
                  if (currentFragmentState.startTimestamp !== null) {
                    offsetFragmentTrackDataByTimestamp(trackData, currentFragmentState.startTimestamp);
                    trackData.startTimestampIsFinal = true;
                  }
                  if (currentFragmentState.encryptionAuxInfo && !trackData.samples[0].encryption) {
                    trackData.encryptionAuxInfo = currentFragmentState.encryptionAuxInfo;
                  }
                }
              this.currentTrack.currentFragmentState = null;
              this.currentTrack = null;
            }
          }
          ;
          break;
        case "pssh":
          {
            if (this.input._formatOptions.isobmff?._suppressPsshParsing) {
              break;
            }
            const psshBox = parsePsshBoxContents(readBytes(slice, boxInfo.contentSize));
            if (this.currentFragment) {
              this.currentFragment.psshBoxes.push(psshBox);
            } else if (!this.currentTrack) {
              this.psshBoxes.push(psshBox);
            }
          }
          ;
          break;
        case "tfhd":
          {
            assert(this.currentFragment);
            slice.skip(1);
            const flags = readU24Be(slice);
            const baseDataOffsetPresent = Boolean(flags & 1);
            const sampleDescriptionIndexPresent = Boolean(flags & 2);
            const defaultSampleDurationPresent = Boolean(flags & 8);
            const defaultSampleSizePresent = Boolean(flags & 16);
            const defaultSampleFlagsPresent = Boolean(flags & 32);
            const durationIsEmpty = Boolean(flags & 65536);
            const defaultBaseIsMoof = Boolean(flags & 131072);
            const trackId = readU32Be(slice);
            const track = this.tracks.find((x) => x.id === trackId);
            if (!track) {
              break;
            }
            const defaults = this.fragmentTrackDefaults.find((x) => x.trackId === trackId);
            this.currentTrack = track;
            track.currentFragmentState = {
              baseDataOffset: this.currentFragment.implicitBaseDataOffset,
              sampleDescriptionIndex: defaults?.defaultSampleDescriptionIndex ?? null,
              defaultSampleDuration: defaults?.defaultSampleDuration ?? null,
              defaultSampleSize: defaults?.defaultSampleSize ?? null,
              defaultSampleFlags: defaults?.defaultSampleFlags ?? null,
              startTimestamp: null,
              encryptionAuxInfo: null
            };
            if (baseDataOffsetPresent) {
              track.currentFragmentState.baseDataOffset = readU64Be(slice);
            } else if (defaultBaseIsMoof) {
              track.currentFragmentState.baseDataOffset = this.currentFragment.moofOffset;
            }
            if (sampleDescriptionIndexPresent) {
              track.currentFragmentState.sampleDescriptionIndex = readU32Be(slice);
            }
            if (defaultSampleDurationPresent) {
              track.currentFragmentState.defaultSampleDuration = readU32Be(slice);
            }
            if (defaultSampleSizePresent) {
              track.currentFragmentState.defaultSampleSize = readU32Be(slice);
            }
            if (defaultSampleFlagsPresent) {
              track.currentFragmentState.defaultSampleFlags = readU32Be(slice);
            }
            if (durationIsEmpty) {
              track.currentFragmentState.defaultSampleDuration = 0;
            }
          }
          ;
          break;
        case "tfdt":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(track.currentFragmentState);
            const version = readU8(slice);
            slice.skip(3);
            const baseMediaDecodeTime = version === 0 ? readU32Be(slice) : readU64Be(slice);
            track.currentFragmentState.startTimestamp = baseMediaDecodeTime;
          }
          ;
          break;
        case "trun":
          {
            const track = this.currentTrack;
            if (!track) {
              break;
            }
            assert(this.currentFragment);
            assert(track.currentFragmentState);
            const version = readU8(slice);
            const flags = readU24Be(slice);
            const dataOffsetPresent = Boolean(flags & 1);
            const firstSampleFlagsPresent = Boolean(flags & 4);
            const sampleDurationPresent = Boolean(flags & 256);
            const sampleSizePresent = Boolean(flags & 512);
            const sampleFlagsPresent = Boolean(flags & 1024);
            const sampleCompositionTimeOffsetsPresent = Boolean(flags & 2048);
            const sampleCount = readU32Be(slice);
            let dataOffset = null;
            if (dataOffsetPresent) {
              dataOffset = readI32Be(slice);
            }
            let firstSampleFlags = null;
            if (firstSampleFlagsPresent) {
              firstSampleFlags = readU32Be(slice);
            }
            let trackData;
            if (this.currentFragment.trackData.has(track.id)) {
              trackData = this.currentFragment.trackData.get(track.id);
              if (dataOffset !== null) {
                trackData.currentOffset = track.currentFragmentState.baseDataOffset + dataOffset;
              } else {
              }
            } else {
              trackData = {
                track,
                currentTimestamp: 0,
                currentOffset: track.currentFragmentState.baseDataOffset + (dataOffset ?? 0),
                startTimestamp: 0,
                endTimestamp: 0,
                firstKeyFrameTimestamp: null,
                samples: [],
                presentationTimestamps: [],
                startTimestampIsFinal: false,
                encryptionAuxInfo: null
              };
              this.currentFragment.trackData.set(track.id, trackData);
            }
            for (let i = 0; i < sampleCount; i++) {
              let sampleDuration;
              if (sampleDurationPresent) {
                sampleDuration = readU32Be(slice);
              } else {
                assert(track.currentFragmentState.defaultSampleDuration !== null);
                sampleDuration = track.currentFragmentState.defaultSampleDuration;
              }
              let sampleSize;
              if (sampleSizePresent) {
                sampleSize = readU32Be(slice);
              } else {
                assert(track.currentFragmentState.defaultSampleSize !== null);
                sampleSize = track.currentFragmentState.defaultSampleSize;
              }
              let sampleFlags;
              if (sampleFlagsPresent) {
                sampleFlags = readU32Be(slice);
              } else {
                assert(track.currentFragmentState.defaultSampleFlags !== null);
                sampleFlags = track.currentFragmentState.defaultSampleFlags;
              }
              if (i === 0 && firstSampleFlags !== null) {
                sampleFlags = firstSampleFlags;
              }
              let sampleCompositionTimeOffset = 0;
              if (sampleCompositionTimeOffsetsPresent) {
                if (version === 0) {
                  sampleCompositionTimeOffset = readU32Be(slice);
                } else {
                  sampleCompositionTimeOffset = readI32Be(slice);
                }
              }
              const isKeyFrame = !(sampleFlags & 65536);
              trackData.samples.push({
                presentationTimestamp: trackData.currentTimestamp + sampleCompositionTimeOffset,
                duration: sampleDuration,
                byteOffset: trackData.currentOffset,
                byteSize: sampleSize,
                isKeyFrame,
                encryption: null
              });
              trackData.currentOffset += sampleSize;
              trackData.currentTimestamp += sampleDuration;
            }
            this.currentFragment.implicitBaseDataOffset = trackData.currentOffset;
          }
          ;
          break;
        case "saiz":
          {
            const track = this.currentTrack;
            if (!track || !track.encryptionInfo) {
              break;
            }
            slice.skip(1);
            const flags = readU24Be(slice);
            if (flags & 1) {
              const auxInfoType = readAscii(slice, 4);
              const auxInfoTypeParam = readU32Be(slice);
              if (auxInfoType !== track.encryptionInfo.scheme || auxInfoTypeParam !== 0) {
                break;
              }
            }
            const defaultSampleInfoSize = readU8(slice);
            const sampleCount = readU32Be(slice);
            let sampleSizes = null;
            if (defaultSampleInfoSize === 0 && sampleCount > 0) {
              sampleSizes = readBytes(slice, sampleCount);
            }
            const aux = getOrCreateEncryptionAuxInfo(track);
            aux.defaultSampleInfoSize = defaultSampleInfoSize;
            aux.sampleSizes = sampleSizes;
            aux.sampleCount = sampleCount;
          }
          ;
          break;
        case "saio":
          {
            const track = this.currentTrack;
            if (!track || !track.encryptionInfo) {
              break;
            }
            const version = readU8(slice);
            const flags = readU24Be(slice);
            if (flags & 1) {
              const auxInfoType = readAscii(slice, 4);
              const auxInfoTypeParam = readU32Be(slice);
              if (auxInfoType !== track.encryptionInfo.scheme || auxInfoTypeParam !== 0) {
                break;
              }
            }
            const entryCount = readU32Be(slice);
            if (entryCount === 0) {
              break;
            }
            if (entryCount > 1) {
              Logging._warn("Multiple saio entries are not supported; using the first offset only.");
            }
            let offset = version === 0 ? readU32Be(slice) : Number(readU64Be(slice));
            if (this.currentFragment) {
              offset += this.currentFragment.moofOffset;
            }
            const aux = getOrCreateEncryptionAuxInfo(track);
            aux.offset = offset;
          }
          ;
          break;
        case "senc":
          {
            const track = this.currentTrack;
            if (!track || !track.encryptionInfo) {
              break;
            }
            assert(this.currentFragment);
            const trackData = this.currentFragment.trackData.get(track.id);
            if (!trackData) {
              break;
            }
            slice.skip(1);
            const flags = readU24Be(slice);
            const useSubsamples = Boolean(flags & 2);
            const sampleCount = readU32Be(slice);
            const ivSize = track.encryptionInfo.defaultPerSampleIvSize;
            assert(ivSize !== null);
            for (let i = 0; i < Math.min(sampleCount, trackData.samples.length); i++) {
              const iv = new Uint8Array(16);
              if (ivSize > 0) {
                iv.set(readBytes(slice, ivSize), 0);
              } else {
                iv.set(track.encryptionInfo.defaultConstantIv, 0);
              }
              let subsamples = null;
              if (useSubsamples) {
                const subsampleCount = readU16Be(slice);
                subsamples = [];
                for (let j = 0; j < subsampleCount; j++) {
                  const clearLen = readU16Be(slice);
                  const protectedLen = readU32Be(slice);
                  subsamples.push({ clearLen, protectedLen });
                }
              }
              const sample = trackData.samples[i];
              sample.encryption = { iv, subsamples };
            }
          }
          ;
          break;
        // Metadata section
        // https://exiftool.org/TagNames/QuickTime.html
        // https://mp4workshop.com/about
        case "udta":
          {
            const iterator = this.iterateContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
            for (const { boxInfo: boxInfo2, slice: slice2 } of iterator) {
              if (boxInfo2.name !== "meta" && !this.currentTrack) {
                const startPos2 = slice2.filePos;
                this.metadataTags.raw ??= {};
                if (boxInfo2.name[0] === "\xA9") {
                  this.metadataTags.raw[boxInfo2.name] ??= readMetadataStringShort(slice2);
                } else {
                  this.metadataTags.raw[boxInfo2.name] ??= readBytes(slice2, boxInfo2.contentSize);
                }
                slice2.filePos = startPos2;
              }
              switch (boxInfo2.name) {
                case "meta":
                  {
                    slice2.skip(-boxInfo2.headerSize);
                    this.traverseBox(slice2);
                  }
                  ;
                  break;
                case "\xA9nam":
                case "name":
                  {
                    if (this.currentTrack) {
                      this.currentTrack.name = textDecoder.decode(readBytes(slice2, boxInfo2.contentSize));
                    } else {
                      this.metadataTags.title ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
                case "\xA9des":
                  {
                    if (!this.currentTrack) {
                      this.metadataTags.description ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
                case "\xA9ART":
                  {
                    if (!this.currentTrack) {
                      this.metadataTags.artist ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
                case "\xA9alb":
                  {
                    if (!this.currentTrack) {
                      this.metadataTags.album ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
                case "albr":
                  {
                    if (!this.currentTrack) {
                      this.metadataTags.albumArtist ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
                case "\xA9gen":
                  {
                    if (!this.currentTrack) {
                      this.metadataTags.genre ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
                case "\xA9day":
                  {
                    if (!this.currentTrack) {
                      const date = new Date(readMetadataStringShort(slice2));
                      if (!Number.isNaN(date.getTime())) {
                        this.metadataTags.date ??= date;
                      }
                    }
                  }
                  ;
                  break;
                case "\xA9cmt":
                  {
                    if (!this.currentTrack) {
                      this.metadataTags.comment ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
                case "\xA9lyr":
                  {
                    if (!this.currentTrack) {
                      this.metadataTags.lyrics ??= readMetadataStringShort(slice2);
                    }
                  }
                  ;
                  break;
              }
            }
          }
          ;
          break;
        case "meta":
          {
            if (this.currentTrack) {
              break;
            }
            const word = readU32Be(slice);
            const isQuickTime = word !== 0;
            this.currentMetadataKeys = /* @__PURE__ */ new Map();
            if (isQuickTime) {
              this.readContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
            } else {
              this.readContiguousBoxes(slice.slice(contentStartPos + 4, boxInfo.contentSize - 4));
            }
            this.currentMetadataKeys = null;
          }
          ;
          break;
        case "keys":
          {
            if (!this.currentMetadataKeys) {
              break;
            }
            slice.skip(4);
            const entryCount = readU32Be(slice);
            for (let i = 0; i < entryCount; i++) {
              const keySize = readU32Be(slice);
              slice.skip(4);
              const keyName = textDecoder.decode(readBytes(slice, keySize - 8));
              this.currentMetadataKeys.set(i + 1, keyName);
            }
          }
          ;
          break;
        case "ilst":
          {
            if (!this.currentMetadataKeys) {
              break;
            }
            const iterator = this.iterateContiguousBoxes(slice.slice(contentStartPos, boxInfo.contentSize));
            for (const { boxInfo: boxInfo2, slice: slice2 } of iterator) {
              let metadataKey = boxInfo2.name;
              const nameAsNumber = (metadataKey.charCodeAt(0) << 24) + (metadataKey.charCodeAt(1) << 16) + (metadataKey.charCodeAt(2) << 8) + metadataKey.charCodeAt(3);
              if (this.currentMetadataKeys.has(nameAsNumber)) {
                metadataKey = this.currentMetadataKeys.get(nameAsNumber);
              }
              const data = readDataBox(slice2);
              this.metadataTags.raw ??= {};
              this.metadataTags.raw[metadataKey] ??= data;
              switch (metadataKey) {
                case "\xA9nam":
                case "titl":
                case "com.apple.quicktime.title":
                case "title":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.title ??= data;
                    }
                  }
                  ;
                  break;
                case "\xA9des":
                case "desc":
                case "dscp":
                case "com.apple.quicktime.description":
                case "description":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.description ??= data;
                    }
                  }
                  ;
                  break;
                case "\xA9ART":
                case "com.apple.quicktime.artist":
                case "artist":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.artist ??= data;
                    }
                  }
                  ;
                  break;
                case "\xA9alb":
                case "albm":
                case "com.apple.quicktime.album":
                case "album":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.album ??= data;
                    }
                  }
                  ;
                  break;
                case "aART":
                case "album_artist":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.albumArtist ??= data;
                    }
                  }
                  ;
                  break;
                case "\xA9cmt":
                case "com.apple.quicktime.comment":
                case "comment":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.comment ??= data;
                    }
                  }
                  ;
                  break;
                case "\xA9gen":
                case "gnre":
                case "com.apple.quicktime.genre":
                case "genre":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.genre ??= data;
                    }
                  }
                  ;
                  break;
                case "\xA9lyr":
                case "lyrics":
                  {
                    if (typeof data === "string") {
                      this.metadataTags.lyrics ??= data;
                    }
                  }
                  ;
                  break;
                case "\xA9day":
                case "rldt":
                case "com.apple.quicktime.creationdate":
                case "date":
                  {
                    if (typeof data === "string") {
                      const date = new Date(data);
                      if (!Number.isNaN(date.getTime())) {
                        this.metadataTags.date ??= date;
                      }
                    }
                  }
                  ;
                  break;
                case "covr":
                case "com.apple.quicktime.artwork":
                  {
                    if (data instanceof RichImageData) {
                      this.metadataTags.images ??= [];
                      this.metadataTags.images.push({
                        data: data.data,
                        kind: "coverFront",
                        mimeType: data.mimeType
                      });
                    } else if (data instanceof Uint8Array) {
                      this.metadataTags.images ??= [];
                      this.metadataTags.images.push({
                        data,
                        kind: "coverFront",
                        mimeType: "image/*"
                      });
                    }
                  }
                  ;
                  break;
                case "track":
                  {
                    if (typeof data === "string") {
                      const parts = data.split("/");
                      const trackNum = Number.parseInt(parts[0], 10);
                      const tracksTotal = parts[1] && Number.parseInt(parts[1], 10);
                      if (Number.isInteger(trackNum) && trackNum > 0) {
                        this.metadataTags.trackNumber ??= trackNum;
                      }
                      if (tracksTotal && Number.isInteger(tracksTotal) && tracksTotal > 0) {
                        this.metadataTags.tracksTotal ??= tracksTotal;
                      }
                    }
                  }
                  ;
                  break;
                case "trkn":
                  {
                    if (data instanceof Uint8Array && data.length >= 6) {
                      const view2 = toDataView(data);
                      const trackNumber = view2.getUint16(2, false);
                      const tracksTotal = view2.getUint16(4, false);
                      if (trackNumber > 0) {
                        this.metadataTags.trackNumber ??= trackNumber;
                      }
                      if (tracksTotal > 0) {
                        this.metadataTags.tracksTotal ??= tracksTotal;
                      }
                    }
                  }
                  ;
                  break;
                case "disc":
                case "disk":
                  {
                    if (data instanceof Uint8Array && data.length >= 6) {
                      const view2 = toDataView(data);
                      const discNumber = view2.getUint16(2, false);
                      const discNumberMax = view2.getUint16(4, false);
                      if (discNumber > 0) {
                        this.metadataTags.discNumber ??= discNumber;
                      }
                      if (discNumberMax > 0) {
                        this.metadataTags.discsTotal ??= discNumberMax;
                      }
                    }
                  }
                  ;
                  break;
              }
            }
          }
          ;
          break;
      }
      slice.filePos = boxEndPos;
      return true;
    }
  };
  var IsobmffTrackBacking = class {
    constructor(internalTrack) {
      this.internalTrack = internalTrack;
      this.packetToSampleIndex = /* @__PURE__ */ new WeakMap();
      this.packetToFragmentLocation = /* @__PURE__ */ new WeakMap();
    }
    getId() {
      return this.internalTrack.id;
    }
    getNumber() {
      const demuxer = this.internalTrack.demuxer;
      const trackType = this.internalTrack.trackBacking.getType();
      let number = 0;
      for (const track of demuxer.tracks) {
        if (track.trackBacking.getType() === trackType) {
          number++;
        }
        if (track === this.internalTrack) {
          break;
        }
      }
      return number;
    }
    getCodec() {
      throw new Error("Not implemented on base class.");
    }
    getInternalCodecId() {
      return this.internalTrack.internalCodecId;
    }
    getName() {
      return this.internalTrack.name;
    }
    getLanguageCode() {
      return this.internalTrack.languageCode;
    }
    getTimeResolution() {
      return this.internalTrack.timescale;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getDisposition() {
      return this.internalTrack.disposition;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      const track = this.internalTrack;
      if (track.durationInMediaTimescale <= 0) {
        return null;
      }
      assert(track.trackBacking);
      const firstPacket = await track.trackBacking.getFirstPacket({ metadataOnly: true });
      return (firstPacket?.timestamp ?? 0) + track.durationInMediaTimescale / track.timescale;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    async getFirstPacket(options) {
      const regularPacket = await this.fetchPacketForSampleIndex(0, options);
      if (regularPacket || !this.internalTrack.demuxer.isFragmented) {
        return regularPacket;
      }
      return this.performFragmentedLookup(
        null,
        (fragment) => {
          const trackData = fragment.trackData.get(this.internalTrack.id);
          if (trackData) {
            return {
              sampleIndex: 0,
              correctSampleFound: true
            };
          }
          return {
            sampleIndex: -1,
            correctSampleFound: false
          };
        },
        -Infinity,
        // Use -Infinity as a search timestamp to avoid using the lookup entries
        Infinity,
        options
      );
    }
    mapTimestampIntoTimescale(timestamp) {
      return roundIfAlmostInteger(timestamp * this.internalTrack.timescale) + this.internalTrack.editListOffset;
    }
    async getPacket(timestamp, options) {
      const timestampInTimescale = this.mapTimestampIntoTimescale(timestamp);
      const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
      const sampleIndex = getSampleIndexForTimestamp(sampleTable, timestampInTimescale);
      const regularPacket = await this.fetchPacketForSampleIndex(sampleIndex, options);
      if (!sampleTableIsEmpty(sampleTable) || !this.internalTrack.demuxer.isFragmented) {
        return regularPacket;
      }
      return this.performFragmentedLookup(
        null,
        (fragment) => {
          const trackData = fragment.trackData.get(this.internalTrack.id);
          if (!trackData) {
            return { sampleIndex: -1, correctSampleFound: false };
          }
          const index = binarySearchLessOrEqual(
            trackData.presentationTimestamps,
            timestampInTimescale,
            (x) => x.presentationTimestamp
          );
          const sampleIndex2 = index !== -1 ? trackData.presentationTimestamps[index].sampleIndex : -1;
          const correctSampleFound = index !== -1 && timestampInTimescale < trackData.endTimestamp;
          return { sampleIndex: sampleIndex2, correctSampleFound };
        },
        timestampInTimescale,
        timestampInTimescale,
        options
      );
    }
    async getNextPacket(packet, options) {
      const regularSampleIndex = this.packetToSampleIndex.get(packet);
      if (regularSampleIndex !== void 0) {
        return this.fetchPacketForSampleIndex(regularSampleIndex + 1, options);
      }
      const locationInFragment = this.packetToFragmentLocation.get(packet);
      if (locationInFragment === void 0) {
        throw new Error("Packet was not created from this track.");
      }
      return this.performFragmentedLookup(
        locationInFragment.fragment,
        (fragment) => {
          if (fragment === locationInFragment.fragment) {
            const trackData = fragment.trackData.get(this.internalTrack.id);
            if (locationInFragment.sampleIndex + 1 < trackData.samples.length) {
              return {
                sampleIndex: locationInFragment.sampleIndex + 1,
                correctSampleFound: true
              };
            }
          } else {
            const trackData = fragment.trackData.get(this.internalTrack.id);
            if (trackData) {
              return {
                sampleIndex: 0,
                correctSampleFound: true
              };
            }
          }
          return {
            sampleIndex: -1,
            correctSampleFound: false
          };
        },
        -Infinity,
        // Use -Infinity as a search timestamp to avoid using the lookup entries
        Infinity,
        options
      );
    }
    async getKeyPacket(timestamp, options) {
      const timestampInTimescale = this.mapTimestampIntoTimescale(timestamp);
      const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
      const sampleIndex = getKeyframeSampleIndexForTimestamp(sampleTable, timestampInTimescale);
      const regularPacket = await this.fetchPacketForSampleIndex(sampleIndex, options);
      if (!sampleTableIsEmpty(sampleTable) || !this.internalTrack.demuxer.isFragmented) {
        return regularPacket;
      }
      return this.performFragmentedLookup(
        null,
        (fragment) => {
          const trackData = fragment.trackData.get(this.internalTrack.id);
          if (!trackData) {
            return { sampleIndex: -1, correctSampleFound: false };
          }
          const index = findLastIndex(trackData.presentationTimestamps, (x) => {
            const sample = trackData.samples[x.sampleIndex];
            return sample.isKeyFrame && x.presentationTimestamp <= timestampInTimescale;
          });
          const sampleIndex2 = index !== -1 ? trackData.presentationTimestamps[index].sampleIndex : -1;
          const correctSampleFound = index !== -1 && timestampInTimescale < trackData.endTimestamp;
          return { sampleIndex: sampleIndex2, correctSampleFound };
        },
        timestampInTimescale,
        timestampInTimescale,
        options
      );
    }
    async getNextKeyPacket(packet, options) {
      const regularSampleIndex = this.packetToSampleIndex.get(packet);
      if (regularSampleIndex !== void 0) {
        const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
        const nextKeyFrameSampleIndex = getNextKeyframeIndexForSample(sampleTable, regularSampleIndex);
        return this.fetchPacketForSampleIndex(nextKeyFrameSampleIndex, options);
      }
      const locationInFragment = this.packetToFragmentLocation.get(packet);
      if (locationInFragment === void 0) {
        throw new Error("Packet was not created from this track.");
      }
      return this.performFragmentedLookup(
        locationInFragment.fragment,
        (fragment) => {
          if (fragment === locationInFragment.fragment) {
            const trackData = fragment.trackData.get(this.internalTrack.id);
            const nextKeyFrameIndex = trackData.samples.findIndex(
              (x, i) => x.isKeyFrame && i > locationInFragment.sampleIndex
            );
            if (nextKeyFrameIndex !== -1) {
              return {
                sampleIndex: nextKeyFrameIndex,
                correctSampleFound: true
              };
            }
          } else {
            const trackData = fragment.trackData.get(this.internalTrack.id);
            if (trackData && trackData.firstKeyFrameTimestamp !== null) {
              const keyFrameIndex = trackData.samples.findIndex((x) => x.isKeyFrame);
              assert(keyFrameIndex !== -1);
              return {
                sampleIndex: keyFrameIndex,
                correctSampleFound: true
              };
            }
          }
          return {
            sampleIndex: -1,
            correctSampleFound: false
          };
        },
        -Infinity,
        // Use -Infinity as a search timestamp to avoid using the lookup entries
        Infinity,
        options
      );
    }
    async fetchPacketForSampleIndex(sampleIndex, options) {
      if (sampleIndex === -1) {
        return null;
      }
      const sampleTable = this.internalTrack.demuxer.getSampleTableForTrack(this.internalTrack);
      const sampleInfo = getSampleInfo(sampleTable, sampleIndex);
      if (!sampleInfo) {
        return null;
      }
      let data;
      if (options.metadataOnly) {
        data = PLACEHOLDER_DATA;
      } else {
        let slice = this.internalTrack.demuxer.reader.requestSlice(
          sampleInfo.sampleOffset,
          sampleInfo.sampleSize
        );
        if (slice instanceof Promise) slice = await slice;
        if (!slice) {
          return null;
        }
        data = readBytes(slice, sampleInfo.sampleSize);
        if (this.internalTrack.encryptionAuxInfo) {
          assert(this.internalTrack.encryptionInfo);
          const entries = await resolveEncryptionAuxInfo(
            this.internalTrack.demuxer.reader,
            this.internalTrack.encryptionInfo,
            this.internalTrack.encryptionAuxInfo
          );
          if (sampleIndex < entries.length) {
            data = await decryptSample(this.internalTrack, entries[sampleIndex], data, null);
          }
        }
      }
      const timestamp = (sampleInfo.presentationTimestamp - this.internalTrack.editListOffset) / this.internalTrack.timescale;
      const duration = sampleInfo.duration / this.internalTrack.timescale;
      const packet = new EncodedPacket(
        data,
        sampleInfo.isKeyFrame ? "key" : "delta",
        timestamp,
        duration,
        sampleIndex,
        sampleInfo.sampleSize
      );
      this.packetToSampleIndex.set(packet, sampleIndex);
      return packet;
    }
    async fetchPacketInFragment(fragment, sampleIndex, options) {
      if (sampleIndex === -1) {
        return null;
      }
      const trackData = fragment.trackData.get(this.internalTrack.id);
      const fragmentSample = trackData.samples[sampleIndex];
      assert(fragmentSample);
      let data;
      if (options.metadataOnly) {
        data = PLACEHOLDER_DATA;
      } else {
        let slice = this.internalTrack.demuxer.reader.requestSlice(
          fragmentSample.byteOffset,
          fragmentSample.byteSize
        );
        if (slice instanceof Promise) slice = await slice;
        if (!slice) {
          return null;
        }
        data = readBytes(slice, fragmentSample.byteSize);
        if (fragmentSample.encryption) {
          data = await decryptSample(this.internalTrack, fragmentSample.encryption, data, fragment);
        }
      }
      const timestamp = (fragmentSample.presentationTimestamp - this.internalTrack.editListOffset) / this.internalTrack.timescale;
      const duration = fragmentSample.duration / this.internalTrack.timescale;
      const packet = new EncodedPacket(
        data,
        fragmentSample.isKeyFrame ? "key" : "delta",
        timestamp,
        duration,
        fragment.moofOffset + sampleIndex,
        fragmentSample.byteSize
      );
      this.packetToFragmentLocation.set(packet, { fragment, sampleIndex });
      return packet;
    }
    /** Looks for a packet in the fragments while trying to load as few fragments as possible to retrieve it. */
    async performFragmentedLookup(startFragment, getMatchInFragment, searchTimestamp, latestTimestamp, options) {
      const demuxer = this.internalTrack.demuxer;
      let currentFragment = null;
      let bestFragment = null;
      let bestSampleIndex = -1;
      if (startFragment) {
        const { sampleIndex, correctSampleFound } = getMatchInFragment(startFragment);
        if (correctSampleFound) {
          return this.fetchPacketInFragment(startFragment, sampleIndex, options);
        }
        if (sampleIndex !== -1) {
          bestFragment = startFragment;
          bestSampleIndex = sampleIndex;
        }
      }
      const lookupEntryIndex = binarySearchLessOrEqual(
        this.internalTrack.fragmentLookupTable,
        searchTimestamp,
        (x) => x.timestamp
      );
      const lookupEntry = lookupEntryIndex !== -1 ? this.internalTrack.fragmentLookupTable[lookupEntryIndex] : null;
      const positionCacheIndex = binarySearchLessOrEqual(
        this.internalTrack.fragmentPositionCache,
        searchTimestamp,
        (x) => x.startTimestamp
      );
      const positionCacheEntry = positionCacheIndex !== -1 ? this.internalTrack.fragmentPositionCache[positionCacheIndex] : null;
      const lookupEntryPosition = Math.max(
        lookupEntry?.moofOffset ?? 0,
        positionCacheEntry?.moofOffset ?? 0
      ) || null;
      let currentPos;
      if (!startFragment) {
        currentPos = lookupEntryPosition ?? 0;
      } else {
        if (lookupEntryPosition === null || startFragment.moofOffset >= lookupEntryPosition) {
          currentPos = startFragment.moofOffset + startFragment.moofSize;
          currentFragment = startFragment;
        } else {
          currentPos = lookupEntryPosition;
        }
      }
      while (true) {
        if (currentFragment) {
          const trackData = currentFragment.trackData.get(this.internalTrack.id);
          if (trackData && trackData.startTimestamp > latestTimestamp) {
            break;
          }
        }
        let slice = demuxer.reader.requestSliceRange(currentPos, MIN_BOX_HEADER_SIZE, MAX_BOX_HEADER_SIZE);
        if (slice instanceof Promise) slice = await slice;
        if (!slice) break;
        const boxStartPos = currentPos;
        const boxInfo = readBoxHeader(slice);
        if (!boxInfo) {
          break;
        }
        if (boxInfo.name === "moof") {
          currentFragment = await demuxer.readFragment(boxStartPos);
          const { sampleIndex, correctSampleFound } = getMatchInFragment(currentFragment);
          if (correctSampleFound) {
            return this.fetchPacketInFragment(currentFragment, sampleIndex, options);
          }
          if (sampleIndex !== -1) {
            bestFragment = currentFragment;
            bestSampleIndex = sampleIndex;
          }
        }
        currentPos = boxStartPos + boxInfo.totalSize;
      }
      if (lookupEntry && (!bestFragment || bestFragment.moofOffset < lookupEntry.moofOffset)) {
        const previousLookupEntry = this.internalTrack.fragmentLookupTable[lookupEntryIndex - 1];
        assert(!previousLookupEntry || previousLookupEntry.timestamp < lookupEntry.timestamp);
        const newSearchTimestamp = previousLookupEntry?.timestamp ?? -Infinity;
        return this.performFragmentedLookup(
          null,
          getMatchInFragment,
          newSearchTimestamp,
          latestTimestamp,
          options
        );
      }
      if (bestFragment) {
        return this.fetchPacketInFragment(bestFragment, bestSampleIndex, options);
      }
      return null;
    }
  };
  var IsobmffVideoTrackBacking = class extends IsobmffTrackBacking {
    constructor(internalTrack) {
      super(internalTrack);
      this.decoderConfigPromise = null;
      this.internalTrack = internalTrack;
    }
    getType() {
      return "video";
    }
    getCodec() {
      return this.internalTrack.info.codec;
    }
    getCodedWidth() {
      return this.internalTrack.info.width;
    }
    getCodedHeight() {
      return this.internalTrack.info.height;
    }
    getSquarePixelWidth() {
      return this.internalTrack.info.squarePixelWidth;
    }
    getSquarePixelHeight() {
      return this.internalTrack.info.squarePixelHeight;
    }
    getRotation() {
      return this.internalTrack.rotation;
    }
    async getColorSpace() {
      return {
        primaries: this.internalTrack.info.colorSpace?.primaries,
        transfer: this.internalTrack.info.colorSpace?.transfer,
        matrix: this.internalTrack.info.colorSpace?.matrix,
        fullRange: this.internalTrack.info.colorSpace?.fullRange
      };
    }
    async canBeTransparent() {
      return this.internalTrack.info.codec === "prores" && (this.internalTrack.info.proresFormat === "ap4h" || this.internalTrack.info.proresFormat === "ap4x");
    }
    async getDecoderConfig() {
      if (!this.internalTrack.info.codec) {
        return null;
      }
      return this.decoderConfigPromise ??= (async () => {
        if (this.internalTrack.info.codec === "vp9" && !this.internalTrack.info.vp9CodecInfo) {
          const firstPacket = await this.getFirstPacket({});
          this.internalTrack.info.vp9CodecInfo = firstPacket && extractVp9CodecInfoFromPacket(firstPacket.data);
        } else if (this.internalTrack.info.codec === "av1" && !this.internalTrack.info.av1CodecInfo) {
          const firstPacket = await this.getFirstPacket({});
          this.internalTrack.info.av1CodecInfo = firstPacket && extractAv1CodecInfoFromPacket(firstPacket.data);
        }
        const config = {
          codec: extractVideoCodecString(this.internalTrack.info),
          codedWidth: this.internalTrack.info.width,
          codedHeight: this.internalTrack.info.height,
          description: this.internalTrack.info.codecDescription ?? void 0,
          colorSpace: this.internalTrack.info.colorSpace ?? void 0
        };
        if (this.internalTrack.info.width !== this.internalTrack.info.squarePixelWidth || this.internalTrack.info.height !== this.internalTrack.info.squarePixelHeight) {
          config.displayAspectWidth = this.internalTrack.info.squarePixelWidth;
          config.displayAspectHeight = this.internalTrack.info.squarePixelHeight;
        }
        return config;
      })();
    }
  };
  var IsobmffAudioTrackBacking = class extends IsobmffTrackBacking {
    constructor(internalTrack) {
      super(internalTrack);
      this.decoderConfig = null;
      this.internalTrack = internalTrack;
    }
    getType() {
      return "audio";
    }
    getCodec() {
      return this.internalTrack.info.codec;
    }
    getNumberOfChannels() {
      return this.internalTrack.info.numberOfChannels;
    }
    getSampleRate() {
      return this.internalTrack.info.sampleRate;
    }
    async getDecoderConfig() {
      if (!this.internalTrack.info.codec) {
        return null;
      }
      return this.decoderConfig ??= {
        codec: extractAudioCodecString(this.internalTrack.info),
        numberOfChannels: this.internalTrack.info.numberOfChannels,
        sampleRate: this.internalTrack.info.sampleRate,
        description: this.internalTrack.info.codecDescription ?? void 0
      };
    }
  };
  var getSampleIndexForTimestamp = (sampleTable, timescaleUnits) => {
    if (sampleTable.presentationTimestamps) {
      const index = binarySearchLessOrEqual(
        sampleTable.presentationTimestamps,
        timescaleUnits,
        (x) => x.presentationTimestamp
      );
      if (index === -1) {
        return -1;
      }
      return sampleTable.presentationTimestamps[index].sampleIndex;
    } else {
      const index = binarySearchLessOrEqual(
        sampleTable.sampleTimingEntries,
        timescaleUnits,
        (x) => x.startDecodeTimestamp
      );
      if (index === -1) {
        return -1;
      }
      const entry = sampleTable.sampleTimingEntries[index];
      return entry.startIndex + Math.min(
        Math.floor((timescaleUnits - entry.startDecodeTimestamp) / entry.delta),
        entry.count - 1
      );
    }
  };
  var getKeyframeSampleIndexForTimestamp = (sampleTable, timescaleUnits) => {
    if (!sampleTable.keySampleIndices) {
      return getSampleIndexForTimestamp(sampleTable, timescaleUnits);
    }
    if (sampleTable.presentationTimestamps) {
      const index = binarySearchLessOrEqual(
        sampleTable.presentationTimestamps,
        timescaleUnits,
        (x) => x.presentationTimestamp
      );
      if (index === -1) {
        return -1;
      }
      for (let i = index; i >= 0; i--) {
        const sampleIndex = sampleTable.presentationTimestamps[i].sampleIndex;
        const isKeyFrame = binarySearchExact(sampleTable.keySampleIndices, sampleIndex, (x) => x) !== -1;
        if (isKeyFrame) {
          return sampleIndex;
        }
      }
      return -1;
    } else {
      const sampleIndex = getSampleIndexForTimestamp(sampleTable, timescaleUnits);
      const index = binarySearchLessOrEqual(sampleTable.keySampleIndices, sampleIndex, (x) => x);
      return sampleTable.keySampleIndices[index] ?? -1;
    }
  };
  var getSampleInfo = (sampleTable, sampleIndex) => {
    const timingEntryIndex = binarySearchLessOrEqual(sampleTable.sampleTimingEntries, sampleIndex, (x) => x.startIndex);
    const timingEntry = sampleTable.sampleTimingEntries[timingEntryIndex];
    if (!timingEntry || timingEntry.startIndex + timingEntry.count <= sampleIndex) {
      return null;
    }
    const decodeTimestamp = timingEntry.startDecodeTimestamp + (sampleIndex - timingEntry.startIndex) * timingEntry.delta;
    let presentationTimestamp = decodeTimestamp;
    const offsetEntryIndex = binarySearchLessOrEqual(
      sampleTable.sampleCompositionTimeOffsets,
      sampleIndex,
      (x) => x.startIndex
    );
    const offsetEntry = sampleTable.sampleCompositionTimeOffsets[offsetEntryIndex];
    if (offsetEntry && sampleIndex - offsetEntry.startIndex < offsetEntry.count) {
      presentationTimestamp += offsetEntry.offset;
    }
    const sampleSize = sampleTable.sampleSizes[Math.min(sampleIndex, sampleTable.sampleSizes.length - 1)];
    const chunkEntryIndex = binarySearchLessOrEqual(sampleTable.sampleToChunk, sampleIndex, (x) => x.startSampleIndex);
    const chunkEntry = sampleTable.sampleToChunk[chunkEntryIndex];
    assert(chunkEntry);
    const chunkIndex = chunkEntry.startChunkIndex + Math.floor((sampleIndex - chunkEntry.startSampleIndex) / chunkEntry.samplesPerChunk);
    const chunkOffset = sampleTable.chunkOffsets[chunkIndex];
    const startSampleIndexOfChunk = chunkEntry.startSampleIndex + (chunkIndex - chunkEntry.startChunkIndex) * chunkEntry.samplesPerChunk;
    let chunkSize = 0;
    let sampleOffset = chunkOffset;
    if (sampleTable.sampleSizes.length === 1) {
      sampleOffset += sampleSize * (sampleIndex - startSampleIndexOfChunk);
      chunkSize += sampleSize * chunkEntry.samplesPerChunk;
    } else {
      for (let i = startSampleIndexOfChunk; i < startSampleIndexOfChunk + chunkEntry.samplesPerChunk; i++) {
        const sampleSize2 = sampleTable.sampleSizes[i];
        if (i < sampleIndex) {
          sampleOffset += sampleSize2;
        }
        chunkSize += sampleSize2;
      }
    }
    let duration = timingEntry.delta;
    if (sampleTable.presentationTimestamps) {
      const presentationIndex = sampleTable.presentationTimestampIndexMap[sampleIndex];
      assert(presentationIndex !== void 0);
      if (presentationIndex < sampleTable.presentationTimestamps.length - 1) {
        const nextEntry = sampleTable.presentationTimestamps[presentationIndex + 1];
        const nextPresentationTimestamp = nextEntry.presentationTimestamp;
        duration = nextPresentationTimestamp - presentationTimestamp;
      }
    }
    return {
      presentationTimestamp,
      duration,
      sampleOffset,
      sampleSize,
      chunkOffset,
      chunkSize,
      isKeyFrame: sampleTable.keySampleIndices ? binarySearchExact(sampleTable.keySampleIndices, sampleIndex, (x) => x) !== -1 : true
    };
  };
  var getNextKeyframeIndexForSample = (sampleTable, sampleIndex) => {
    if (!sampleTable.keySampleIndices) {
      return sampleIndex + 1;
    }
    const index = binarySearchLessOrEqual(sampleTable.keySampleIndices, sampleIndex, (x) => x);
    return sampleTable.keySampleIndices[index + 1] ?? -1;
  };
  var offsetFragmentTrackDataByTimestamp = (trackData, timestamp) => {
    trackData.startTimestamp += timestamp;
    trackData.endTimestamp += timestamp;
    for (const sample of trackData.samples) {
      sample.presentationTimestamp += timestamp;
    }
    for (const entry of trackData.presentationTimestamps) {
      entry.presentationTimestamp += timestamp;
    }
  };
  var extractRotationFromMatrix = (matrix) => {
    const [a, b] = matrix;
    const radians = Math.atan2(b, a);
    if (!Number.isFinite(radians)) {
      return 0;
    }
    return radians * (180 / Math.PI);
  };
  var sampleTableIsEmpty = (sampleTable) => {
    return sampleTable.sampleSizes.length === 0;
  };
  var getOrCreateEncryptionAuxInfo = (track) => {
    if (track.currentFragmentState) {
      return track.currentFragmentState.encryptionAuxInfo ??= {
        defaultSampleInfoSize: 0,
        sampleSizes: null,
        sampleCount: 0,
        offset: null,
        resolved: null
      };
    } else {
      return track.encryptionAuxInfo ??= {
        defaultSampleInfoSize: 0,
        sampleSizes: null,
        sampleCount: 0,
        offset: null,
        resolved: null
      };
    }
  };
  var resolveEncryptionAuxInfo = async (reader, encryptionInfo, aux) => {
    if (aux.resolved) {
      return aux.resolved;
    }
    if (aux.offset === null || aux.sampleCount === 0) {
      throw new Error("Incomplete saiz/saio info; cannot resolve encryption data.");
    }
    let totalSize = 0;
    if (aux.defaultSampleInfoSize > 0) {
      totalSize = aux.defaultSampleInfoSize * aux.sampleCount;
    } else {
      assert(aux.sampleSizes);
      for (let i = 0; i < aux.sampleCount; i++) {
        totalSize += aux.sampleSizes[i];
      }
    }
    let slice = reader.requestSlice(aux.offset, totalSize);
    if (slice instanceof Promise) slice = await slice;
    if (!slice) {
      throw new Error("Failed to read auxiliary encryption info.");
    }
    const ivSize = encryptionInfo.defaultPerSampleIvSize;
    assert(ivSize !== null);
    const entries = [];
    for (let i = 0; i < aux.sampleCount; i++) {
      const entrySize = aux.defaultSampleInfoSize > 0 ? aux.defaultSampleInfoSize : aux.sampleSizes[i];
      const iv = new Uint8Array(16);
      if (ivSize > 0) {
        iv.set(readBytes(slice, ivSize), 0);
      } else {
        iv.set(encryptionInfo.defaultConstantIv, 0);
      }
      let subsamples = null;
      if (entrySize > ivSize) {
        const subsampleCount = readU16Be(slice);
        subsamples = [];
        for (let j = 0; j < subsampleCount; j++) {
          const clearLen = readU16Be(slice);
          const protectedLen = readU32Be(slice);
          subsamples.push({ clearLen, protectedLen });
        }
      }
      entries.push({ iv, subsamples });
    }
    aux.resolved = entries;
    return entries;
  };
  var decryptSample = async (track, sampleEncryption, data, fragment) => {
    assert(track.encryptionInfo);
    const encryptionInfo = track.encryptionInfo;
    assert(encryptionInfo.defaultKid !== null);
    const keyId = encryptionInfo.defaultKid;
    let keyBytes;
    const cacheEntry = track.demuxer.decryptionKeyCache.get(keyId);
    if (cacheEntry) {
      keyBytes = await cacheEntry;
    } else {
      if (!track.demuxer.input._formatOptions.isobmff?.resolveKeyId) {
        throw new Error(
          "Encrypted media samples encountered. To decrypt them, please provide a callback for InputOptions.formatOptions.isobmff.resolveKeyId."
        );
      }
      const promise = (async () => {
        let psshBoxes = track.demuxer.psshBoxes;
        if (fragment) {
          psshBoxes = [
            ...psshBoxes,
            ...fragment.psshBoxes
          ].filter((x) => x.keyIds === null || x.keyIds.includes(keyId));
          for (let i = 0; i < psshBoxes.length - 1; i++) {
            for (let j = i + 1; j < psshBoxes.length; j++) {
              if (psshBoxesAreEqual(psshBoxes[i], psshBoxes[j])) {
                psshBoxes.splice(j, 1);
                j--;
              }
            }
          }
        }
        const keyResult = await track.demuxer.input._formatOptions.isobmff.resolveKeyId({ keyId, psshBoxes });
        if (!(typeof keyResult === "string" && keyResult.length === 32 && HEX_STRING_REGEX.test(keyResult) || keyResult instanceof Uint8Array && keyResult.byteLength === 16)) {
          throw new TypeError(
            "resolveKeyId must return a 32-character hex string or a 16-byte Uint8Array containing the decryption key."
          );
        }
        return keyResult instanceof Uint8Array ? keyResult : hexStringToBytes(keyResult);
      })();
      track.demuxer.decryptionKeyCache.set(keyId, promise);
      keyBytes = await promise;
    }
    if (encryptionInfo.scheme === "cenc" || encryptionInfo.scheme === "cens") {
      return decryptCtr(keyBytes, encryptionInfo, sampleEncryption, data);
    } else {
      return decryptCbcs(keyBytes, encryptionInfo, sampleEncryption, data);
    }
  };
  var decryptCtr = async (key, encryptionInfo, sampleEncryption, data) => {
    const counter = new Uint8Array(16);
    counter.set(sampleEncryption.iv, 0);
    const cryptoKey = await crypto.subtle.importKey(
      "raw",
      key,
      { name: "AES-CTR" },
      false,
      ["decrypt"]
    );
    const cryptApply = async (input) => {
      const plaintext = await crypto.subtle.decrypt(
        { name: "AES-CTR", counter, length: 64 },
        cryptoKey,
        input
      );
      return new Uint8Array(plaintext);
    };
    if (!sampleEncryption.subsamples) {
      return cryptApply(data);
    }
    assert(encryptionInfo.defaultCryptByteBlock !== null && encryptionInfo.defaultSkipByteBlock !== null);
    const cryptRanges = collectCryptRanges(
      sampleEncryption.subsamples,
      encryptionInfo.defaultCryptByteBlock,
      encryptionInfo.defaultSkipByteBlock
    );
    let totalCryptLen = 0;
    for (const range of cryptRanges) {
      for (const seg of range.perSubsample) {
        totalCryptLen += seg.length;
      }
    }
    const cryptBuffer = new Uint8Array(totalCryptLen);
    let writePos = 0;
    for (const range of cryptRanges) {
      for (const seg of range.perSubsample) {
        cryptBuffer.set(data.subarray(seg.offset, seg.offset + seg.length), writePos);
        writePos += seg.length;
      }
    }
    const plain = await cryptApply(cryptBuffer);
    const output = new Uint8Array(data);
    let readPos = 0;
    for (const range of cryptRanges) {
      for (const seg of range.perSubsample) {
        output.set(plain.subarray(readPos, readPos + seg.length), seg.offset);
        readPos += seg.length;
      }
    }
    return output;
  };
  var decryptCbcs = (key, encryptionInfo, sampleEncryption, data) => {
    const ctx = new Aes128CbcContext();
    ctx.init({ key, iv: sampleEncryption.iv });
    const cryptByteBlock = encryptionInfo.defaultCryptByteBlock;
    const skipByteBlock = encryptionInfo.defaultSkipByteBlock;
    assert(cryptByteBlock !== null && skipByteBlock !== null);
    if (!sampleEncryption.subsamples) {
      const output2 = new Uint8Array(data);
      const numBlocks = Math.floor(data.length / 16);
      for (let b = 0; b < numBlocks; b++) {
        const off = b * 16;
        ctx.in.set(data.subarray(off, off + 16));
        ctx.decrypt();
        output2.set(ctx.out, off);
      }
      return output2;
    }
    if (cryptByteBlock === 0 && skipByteBlock === 0) {
      throw new Error("cbcs with subsamples requires pattern encryption.");
    }
    const output = new Uint8Array(data);
    const cryptRanges = collectCryptRanges(sampleEncryption.subsamples, cryptByteBlock, skipByteBlock);
    const ivView = new DataView(sampleEncryption.iv.buffer, sampleEncryption.iv.byteOffset, 16);
    for (const range of cryptRanges) {
      ctx.iv[0] = ivView.getUint32(0, false);
      ctx.iv[1] = ivView.getUint32(4, false);
      ctx.iv[2] = ivView.getUint32(8, false);
      ctx.iv[3] = ivView.getUint32(12, false);
      for (const seg of range.perSubsample) {
        const numBlocks = seg.length / 16;
        for (let b = 0; b < numBlocks; b++) {
          const offset = seg.offset + b * 16;
          ctx.in.set(data.subarray(offset, offset + 16));
          ctx.decrypt();
          output.set(ctx.out, offset);
        }
      }
    }
    return output;
  };
  var collectCryptRanges = (subsamples, cryptByteBlock, skipByteBlock) => {
    const ranges = [];
    const hasPattern = cryptByteBlock !== 0 || skipByteBlock !== 0;
    let cursor = 0;
    for (const subsample of subsamples) {
      cursor += subsample.clearLen;
      const perSubsample = [];
      if (!hasPattern) {
        if (subsample.protectedLen > 0) {
          perSubsample.push({ offset: cursor, length: subsample.protectedLen });
        }
        cursor += subsample.protectedLen;
      } else {
        let remaining = subsample.protectedLen;
        let pos = cursor;
        while (remaining > 0) {
          if (remaining < 16 * cryptByteBlock) {
            break;
          }
          const cryptBytes = 16 * cryptByteBlock;
          perSubsample.push({ offset: pos, length: cryptBytes });
          pos += cryptBytes;
          remaining -= cryptBytes;
          const skipBytes = Math.min(16 * skipByteBlock, remaining);
          pos += skipBytes;
          remaining -= skipBytes;
        }
        cursor += subsample.protectedLen;
      }
      ranges.push({ perSubsample });
    }
    return ranges;
  };

  // src/matroska/ebml.ts
  var EBMLFloat32 = class {
    constructor(value) {
      this.value = value;
    }
  };
  var EBMLFloat64 = class {
    constructor(value) {
      this.value = value;
    }
  };
  var EBMLSignedInt = class {
    constructor(value) {
      this.value = value;
    }
  };
  var EBMLUnicodeString = class {
    constructor(value) {
      this.value = value;
    }
  };
  var LEVEL_0_EBML_IDS = [
    440786851 /* EBML */,
    408125543 /* Segment */
  ];
  var LEVEL_1_EBML_IDS = [
    290298740 /* SeekHead */,
    357149030 /* Info */,
    524531317 /* Cluster */,
    374648427 /* Tracks */,
    475249515 /* Cues */,
    423732329 /* Attachments */,
    272869232 /* Chapters */,
    307544935 /* Tags */
  ];
  var LEVEL_0_AND_1_EBML_IDS = [
    ...LEVEL_0_EBML_IDS,
    ...LEVEL_1_EBML_IDS
  ];
  var measureUnsignedInt = (value) => {
    if (value < 1 << 8) {
      return 1;
    } else if (value < 1 << 16) {
      return 2;
    } else if (value < 1 << 24) {
      return 3;
    } else if (value < 2 ** 32) {
      return 4;
    } else if (value < 2 ** 40) {
      return 5;
    } else {
      return 6;
    }
  };
  var measureUnsignedBigInt = (value) => {
    if (value < 1n << 8n) {
      return 1;
    } else if (value < 1n << 16n) {
      return 2;
    } else if (value < 1n << 24n) {
      return 3;
    } else if (value < 1n << 32n) {
      return 4;
    } else if (value < 1n << 40n) {
      return 5;
    } else if (value < 1n << 48n) {
      return 6;
    } else if (value < 1n << 56n) {
      return 7;
    } else {
      return 8;
    }
  };
  var measureSignedInt = (value) => {
    if (value >= -(1 << 6) && value < 1 << 6) {
      return 1;
    } else if (value >= -(1 << 13) && value < 1 << 13) {
      return 2;
    } else if (value >= -(1 << 20) && value < 1 << 20) {
      return 3;
    } else if (value >= -(1 << 27) && value < 1 << 27) {
      return 4;
    } else if (value >= -(2 ** 34) && value < 2 ** 34) {
      return 5;
    } else {
      return 6;
    }
  };
  var measureVarInt = (value) => {
    if (value < (1 << 7) - 1) {
      return 1;
    } else if (value < (1 << 14) - 1) {
      return 2;
    } else if (value < (1 << 21) - 1) {
      return 3;
    } else if (value < (1 << 28) - 1) {
      return 4;
    } else if (value < 2 ** 35 - 1) {
      return 5;
    } else if (value < 2 ** 42 - 1) {
      return 6;
    } else {
      throw new Error("EBML varint size not supported " + value);
    }
  };
  var EBMLWriter = class {
    constructor(writer) {
      this.writer = writer;
      this.helper = new Uint8Array(8);
      this.helperView = new DataView(this.helper.buffer);
      /**
       * Stores the position from the start of the file to where EBML elements have been written. This is used to
       * rewrite/edit elements that were already added before, and to measure sizes of things.
       */
      this.offsets = /* @__PURE__ */ new WeakMap();
      /** Same as offsets, but stores position where the element's data starts (after ID and size fields). */
      this.dataOffsets = /* @__PURE__ */ new WeakMap();
    }
    writeByte(value) {
      this.helperView.setUint8(0, value);
      this.writer.write(this.helper.subarray(0, 1));
    }
    writeFloat32(value) {
      this.helperView.setFloat32(0, value, false);
      this.writer.write(this.helper.subarray(0, 4));
    }
    writeFloat64(value) {
      this.helperView.setFloat64(0, value, false);
      this.writer.write(this.helper);
    }
    writeUnsignedInt(value, width = measureUnsignedInt(value)) {
      let pos = 0;
      switch (width) {
        case 6:
          this.helperView.setUint8(pos++, value / 2 ** 40 | 0);
        // eslint-disable-next-line no-fallthrough
        case 5:
          this.helperView.setUint8(pos++, value / 2 ** 32 | 0);
        // eslint-disable-next-line no-fallthrough
        case 4:
          this.helperView.setUint8(pos++, value >> 24);
        // eslint-disable-next-line no-fallthrough
        case 3:
          this.helperView.setUint8(pos++, value >> 16);
        // eslint-disable-next-line no-fallthrough
        case 2:
          this.helperView.setUint8(pos++, value >> 8);
        // eslint-disable-next-line no-fallthrough
        case 1:
          this.helperView.setUint8(pos++, value);
          break;
        default:
          throw new Error("Bad unsigned int size " + width);
      }
      this.writer.write(this.helper.subarray(0, pos));
    }
    writeUnsignedBigInt(value, width = measureUnsignedBigInt(value)) {
      let pos = 0;
      for (let i = width - 1; i >= 0; i--) {
        this.helperView.setUint8(pos++, Number(value >> BigInt(i * 8) & 0xffn));
      }
      this.writer.write(this.helper.subarray(0, pos));
    }
    writeSignedInt(value, width = measureSignedInt(value)) {
      if (value < 0) {
        value += 2 ** (width * 8);
      }
      this.writeUnsignedInt(value, width);
    }
    writeVarInt(value, width = measureVarInt(value)) {
      let pos = 0;
      switch (width) {
        case 1:
          this.helperView.setUint8(pos++, 1 << 7 | value);
          break;
        case 2:
          this.helperView.setUint8(pos++, 1 << 6 | value >> 8);
          this.helperView.setUint8(pos++, value);
          break;
        case 3:
          this.helperView.setUint8(pos++, 1 << 5 | value >> 16);
          this.helperView.setUint8(pos++, value >> 8);
          this.helperView.setUint8(pos++, value);
          break;
        case 4:
          this.helperView.setUint8(pos++, 1 << 4 | value >> 24);
          this.helperView.setUint8(pos++, value >> 16);
          this.helperView.setUint8(pos++, value >> 8);
          this.helperView.setUint8(pos++, value);
          break;
        case 5:
          this.helperView.setUint8(pos++, 1 << 3 | value / 2 ** 32 & 7);
          this.helperView.setUint8(pos++, value >> 24);
          this.helperView.setUint8(pos++, value >> 16);
          this.helperView.setUint8(pos++, value >> 8);
          this.helperView.setUint8(pos++, value);
          break;
        case 6:
          this.helperView.setUint8(pos++, 1 << 2 | value / 2 ** 40 & 3);
          this.helperView.setUint8(pos++, value / 2 ** 32 | 0);
          this.helperView.setUint8(pos++, value >> 24);
          this.helperView.setUint8(pos++, value >> 16);
          this.helperView.setUint8(pos++, value >> 8);
          this.helperView.setUint8(pos++, value);
          break;
        default:
          throw new Error("Bad EBML varint size " + width);
      }
      this.writer.write(this.helper.subarray(0, pos));
    }
    writeAsciiString(str) {
      this.writer.write(new Uint8Array(str.split("").map((x) => x.charCodeAt(0))));
    }
    writeEBML(data) {
      if (data === null) return;
      if (data instanceof Uint8Array) {
        this.writer.write(data);
      } else if (Array.isArray(data)) {
        for (const elem of data) {
          this.writeEBML(elem);
        }
      } else {
        this.offsets.set(data, this.writer.getPos());
        this.writeUnsignedInt(data.id);
        if (Array.isArray(data.data)) {
          const sizePos = this.writer.getPos();
          const sizeSize = data.size === -1 ? 1 : data.size ?? 4;
          if (data.size === -1) {
            this.writeByte(255);
          } else {
            this.writer.seek(this.writer.getPos() + sizeSize);
          }
          const startPos = this.writer.getPos();
          this.dataOffsets.set(data, startPos);
          this.writeEBML(data.data);
          if (data.size !== -1) {
            const size = this.writer.getPos() - startPos;
            const endPos = this.writer.getPos();
            this.writer.seek(sizePos);
            this.writeVarInt(size, sizeSize);
            this.writer.seek(endPos);
          }
        } else if (typeof data.data === "number") {
          const size = data.size ?? measureUnsignedInt(data.data);
          this.writeVarInt(size);
          this.writeUnsignedInt(data.data, size);
        } else if (typeof data.data === "bigint") {
          const size = data.size ?? measureUnsignedBigInt(data.data);
          this.writeVarInt(size);
          this.writeUnsignedBigInt(data.data, size);
        } else if (typeof data.data === "string") {
          this.writeVarInt(data.data.length);
          this.writeAsciiString(data.data);
        } else if (data.data instanceof Uint8Array) {
          this.writeVarInt(data.data.byteLength, data.size);
          this.writer.write(data.data);
        } else if (data.data instanceof EBMLFloat32) {
          this.writeVarInt(4);
          this.writeFloat32(data.data.value);
        } else if (data.data instanceof EBMLFloat64) {
          this.writeVarInt(8);
          this.writeFloat64(data.data.value);
        } else if (data.data instanceof EBMLSignedInt) {
          const size = data.size ?? measureSignedInt(data.data.value);
          this.writeVarInt(size);
          this.writeSignedInt(data.data.value, size);
        } else if (data.data instanceof EBMLUnicodeString) {
          const bytes2 = textEncoder.encode(data.data.value);
          this.writeVarInt(bytes2.length);
          this.writer.write(bytes2);
        } else {
          assertNever(data.data);
        }
      }
    }
  };
  var MAX_VAR_INT_SIZE = 8;
  var MIN_HEADER_SIZE = 2;
  var MAX_HEADER_SIZE = 2 * MAX_VAR_INT_SIZE;
  var readVarIntSize = (slice) => {
    if (slice.remainingLength < 1) {
      return null;
    }
    const firstByte = readU8(slice);
    slice.skip(-1);
    if (firstByte === 0) {
      return null;
    }
    let width = 1;
    let mask = 128;
    while ((firstByte & mask) === 0) {
      width++;
      mask >>= 1;
    }
    if (slice.remainingLength < width) {
      return null;
    }
    return width;
  };
  var readVarInt = (slice) => {
    if (slice.remainingLength < 1) {
      return null;
    }
    const firstByte = readU8(slice);
    if (firstByte === 0) {
      return null;
    }
    let width = 1;
    let mask = 1 << 7;
    while ((firstByte & mask) === 0) {
      width++;
      mask >>= 1;
    }
    if (slice.remainingLength < width - 1) {
      return null;
    }
    let value = firstByte & mask - 1;
    for (let i = 1; i < width; i++) {
      value *= 1 << 8;
      value += readU8(slice);
    }
    return value;
  };
  var readUnsignedInt = (slice, width) => {
    if (width < 1 || width > 8) {
      throw new Error("Bad unsigned int size " + width);
    }
    let value = 0;
    for (let i = 0; i < width; i++) {
      value *= 1 << 8;
      value += readU8(slice);
    }
    return value;
  };
  var readUnsignedBigInt = (slice, width) => {
    if (width < 1) {
      throw new Error("Bad unsigned int size " + width);
    }
    let value = 0n;
    for (let i = 0; i < width; i++) {
      value <<= 8n;
      value += BigInt(readU8(slice));
    }
    return value;
  };
  var readElementId = (slice) => {
    const size = readVarIntSize(slice);
    if (size === null) {
      return null;
    }
    if (slice.remainingLength < size) {
      return null;
    }
    const id = readUnsignedInt(slice, size);
    return id;
  };
  var readElementSize = (slice) => {
    if (slice.remainingLength < 1) {
      return null;
    }
    const firstByte = readU8(slice);
    if (firstByte === 255) {
      return void 0;
    }
    slice.skip(-1);
    const size = readVarInt(slice);
    if (size === null) {
      return null;
    }
    if (size === 72057594037927940) {
      return void 0;
    }
    return size;
  };
  var readElementHeader = (slice) => {
    assert(slice.remainingLength >= MIN_HEADER_SIZE);
    const id = readElementId(slice);
    if (id === null) {
      return null;
    }
    const size = readElementSize(slice);
    if (size === null) {
      return null;
    }
    return { id, size };
  };
  var readAsciiString = (slice, length) => {
    const bytes2 = readBytes(slice, length);
    let strLength = 0;
    while (strLength < length && bytes2[strLength] !== 0) {
      strLength += 1;
    }
    return String.fromCharCode(...bytes2.subarray(0, strLength));
  };
  var readUnicodeString = (slice, length) => {
    const bytes2 = readBytes(slice, length);
    let strLength = 0;
    while (strLength < length && bytes2[strLength] !== 0) {
      strLength += 1;
    }
    return textDecoder.decode(bytes2.subarray(0, strLength));
  };
  var readFloat = (slice, width) => {
    if (width === 0) {
      return 0;
    }
    if (width !== 4 && width !== 8) {
      throw new Error("Bad float size " + width);
    }
    return width === 4 ? readF32Be(slice) : readF64Be(slice);
  };
  var searchForNextElementId = async (reader, startPos, ids, until) => {
    const idsSet = new Set(ids);
    let currentPos = startPos;
    while (until === null || currentPos < until) {
      let slice = reader.requestSliceRange(currentPos, MIN_HEADER_SIZE, MAX_HEADER_SIZE);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) break;
      const elementHeader = readElementHeader(slice);
      if (!elementHeader) {
        break;
      }
      if (idsSet.has(elementHeader.id)) {
        return { pos: currentPos, found: true };
      }
      assertDefinedSize(elementHeader.size);
      currentPos = slice.filePos + elementHeader.size;
    }
    return { pos: until !== null && until > currentPos ? until : currentPos, found: false };
  };
  var resync = async (reader, startPos, ids, until) => {
    const CHUNK_SIZE = 2 ** 16;
    const idsSet = new Set(ids);
    let currentPos = startPos;
    while (currentPos < until) {
      let slice = reader.requestSliceRange(currentPos, 0, Math.min(CHUNK_SIZE, until - currentPos));
      if (slice instanceof Promise) slice = await slice;
      if (!slice) break;
      if (slice.length < MAX_VAR_INT_SIZE) break;
      for (let i = 0; i < slice.length - MAX_VAR_INT_SIZE; i++) {
        slice.filePos = currentPos;
        const elementId = readElementId(slice);
        if (elementId !== null && idsSet.has(elementId)) {
          return currentPos;
        }
        currentPos++;
      }
    }
    return null;
  };
  var CODEC_STRING_MAP = {
    "avc": "V_MPEG4/ISO/AVC",
    "hevc": "V_MPEGH/ISO/HEVC",
    "vp8": "V_VP8",
    "vp9": "V_VP9",
    "av1": "V_AV1",
    "prores": "V_PRORES",
    "aac": "A_AAC",
    "mp3": "A_MPEG/L3",
    "opus": "A_OPUS",
    "vorbis": "A_VORBIS",
    "flac": "A_FLAC",
    "ac3": "A_AC3",
    "eac3": "A_EAC3",
    "pcm-u8": "A_PCM/INT/LIT",
    "pcm-s16": "A_PCM/INT/LIT",
    "pcm-s16be": "A_PCM/INT/BIG",
    "pcm-s24": "A_PCM/INT/LIT",
    "pcm-s24be": "A_PCM/INT/BIG",
    "pcm-s32": "A_PCM/INT/LIT",
    "pcm-s32be": "A_PCM/INT/BIG",
    "pcm-f32": "A_PCM/FLOAT/IEEE",
    "pcm-f64": "A_PCM/FLOAT/IEEE",
    "webvtt": "S_TEXT/WEBVTT"
  };
  function assertDefinedSize(size) {
    if (size === void 0) {
      throw new Error("Undefined element size is used in a place where it is not supported.");
    }
  }

  // src/matroska/matroska-misc.ts
  var buildMatroskaMimeType = (info) => {
    const base = info.hasVideo ? "video/" : info.hasAudio ? "audio/" : "application/";
    let string = base + (info.isWebM ? "webm" : "x-matroska");
    if (info.codecStrings.length > 0) {
      const uniqueCodecMimeTypes = [...new Set(info.codecStrings.filter(Boolean))];
      string += `; codecs="${uniqueCodecMimeTypes.join(", ")}"`;
    }
    return string;
  };

  // src/matroska/matroska-demuxer.ts
  var METADATA_ELEMENTS = [
    { id: 290298740 /* SeekHead */, flag: "seekHeadSeen" },
    { id: 357149030 /* Info */, flag: "infoSeen" },
    { id: 374648427 /* Tracks */, flag: "tracksSeen" },
    { id: 475249515 /* Cues */, flag: "cuesSeen" }
  ];
  var MAX_RESYNC_LENGTH = 10 * 2 ** 20;
  var MatroskaDemuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.readMetadataPromise = null;
      this.segments = [];
      this.currentSegment = null;
      this.currentTrack = null;
      this.currentCluster = null;
      this.currentBlock = null;
      this.currentBlockAdditional = null;
      this.currentCueTime = null;
      this.currentDecodingInstruction = null;
      this.currentTagTargetIsMovie = true;
      this.currentSimpleTagName = null;
      this.currentAttachedFile = null;
      this.isWebM = false;
      this.reader = input._reader;
    }
    async getTrackBackings() {
      await this.readMetadata();
      return this.segments.flatMap((segment) => segment.tracks.map((track) => track.trackBacking));
    }
    async getMimeType() {
      await this.readMetadata();
      const backings = await this.getTrackBackings();
      const codecStrings = await Promise.all(backings.map(
        (x) => x.getDecoderConfig().then((c) => c?.codec ?? null)
      ));
      return buildMatroskaMimeType({
        isWebM: this.isWebM,
        hasVideo: this.segments.some((segment) => segment.tracks.some((x) => x.info?.type === "video")),
        hasAudio: this.segments.some((segment) => segment.tracks.some((x) => x.info?.type === "audio")),
        codecStrings: codecStrings.filter(Boolean)
      });
    }
    async getMetadataTags() {
      await this.readMetadata();
      for (const segment of this.segments) {
        if (!segment.metadataTagsCollected) {
          if (this.reader.fileSize !== null) {
            await this.loadSegmentMetadata(segment);
          } else {
          }
          segment.metadataTagsCollected = true;
        }
      }
      let metadataTags = {};
      for (const segment of this.segments) {
        metadataTags = { ...metadataTags, ...segment.metadataTags };
      }
      return metadataTags;
    }
    readMetadata() {
      return this.readMetadataPromise ??= (async () => {
        let currentPos = 0;
        while (true) {
          let slice = this.reader.requestSliceRange(currentPos, MIN_HEADER_SIZE, MAX_HEADER_SIZE);
          if (slice instanceof Promise) slice = await slice;
          if (!slice) break;
          const header = readElementHeader(slice);
          if (!header) {
            break;
          }
          const id = header.id;
          let size = header.size;
          const dataStartPos = slice.filePos;
          if (id === 440786851 /* EBML */) {
            assertDefinedSize(size);
            let slice2 = this.reader.requestSlice(dataStartPos, size);
            if (slice2 instanceof Promise) slice2 = await slice2;
            if (!slice2) break;
            this.readContiguousElements(slice2);
          } else if (id === 408125543 /* Segment */) {
            await this.readSegment(dataStartPos, size);
            if (size === void 0) {
              break;
            }
            if (this.reader.fileSize === null) {
              break;
            }
          } else if (id === 524531317 /* Cluster */) {
            if (this.reader.fileSize === null) {
              break;
            }
            if (size === void 0) {
              const nextElementPos = await searchForNextElementId(
                this.reader,
                dataStartPos,
                LEVEL_0_AND_1_EBML_IDS,
                this.reader.fileSize
              );
              size = nextElementPos.pos - dataStartPos;
            }
            const lastSegment = last(this.segments);
            if (lastSegment) {
              lastSegment.elementEndPos = dataStartPos + size;
            }
          }
          assertDefinedSize(size);
          currentPos = dataStartPos + size;
        }
      })();
    }
    async readSegment(segmentDataStart, dataSize) {
      this.currentSegment = {
        seekHeadSeen: false,
        infoSeen: false,
        tracksSeen: false,
        cuesSeen: false,
        tagsSeen: false,
        attachmentsSeen: false,
        timestampScale: -1,
        timestampFactor: -1,
        duration: -1,
        seekEntries: [],
        tracks: [],
        cuePoints: [],
        dataStartPos: segmentDataStart,
        elementEndPos: dataSize === void 0 ? null : segmentDataStart + dataSize,
        clusterSeekStartPos: segmentDataStart,
        lastReadCluster: null,
        metadataTags: {},
        metadataTagsCollected: false
      };
      this.segments.push(this.currentSegment);
      let currentPos = segmentDataStart;
      while (this.currentSegment.elementEndPos === null || currentPos < this.currentSegment.elementEndPos) {
        let slice = this.reader.requestSliceRange(currentPos, MIN_HEADER_SIZE, MAX_HEADER_SIZE);
        if (slice instanceof Promise) slice = await slice;
        if (!slice) break;
        const elementStartPos = currentPos;
        const header = readElementHeader(slice);
        if (!header || !LEVEL_1_EBML_IDS.includes(header.id) && header.id !== 236 /* Void */) {
          const nextPos = await resync(
            this.reader,
            elementStartPos,
            LEVEL_1_EBML_IDS,
            Math.min(this.currentSegment.elementEndPos ?? Infinity, elementStartPos + MAX_RESYNC_LENGTH)
          );
          if (nextPos) {
            currentPos = nextPos;
            continue;
          } else {
            break;
          }
        }
        const { id, size } = header;
        const dataStartPos = slice.filePos;
        const metadataElementIndex = METADATA_ELEMENTS.findIndex((x) => x.id === id);
        if (metadataElementIndex !== -1) {
          const field = METADATA_ELEMENTS[metadataElementIndex].flag;
          this.currentSegment[field] = true;
          assertDefinedSize(size);
          let slice2 = this.reader.requestSlice(dataStartPos, size);
          if (slice2 instanceof Promise) slice2 = await slice2;
          if (slice2) {
            this.readContiguousElements(slice2);
          }
        } else if (id === 307544935 /* Tags */ || id === 423732329 /* Attachments */) {
          if (id === 307544935 /* Tags */) {
            this.currentSegment.tagsSeen = true;
          } else {
            this.currentSegment.attachmentsSeen = true;
          }
          assertDefinedSize(size);
          let slice2 = this.reader.requestSlice(dataStartPos, size);
          if (slice2 instanceof Promise) slice2 = await slice2;
          if (slice2) {
            this.readContiguousElements(slice2);
          }
        } else if (id === 524531317 /* Cluster */) {
          this.currentSegment.clusterSeekStartPos = elementStartPos;
          break;
        }
        if (size === void 0) {
          break;
        } else {
          currentPos = dataStartPos + size;
        }
      }
      this.currentSegment.seekEntries.sort((a, b) => a.segmentPosition - b.segmentPosition);
      if (this.reader.fileSize !== null) {
        for (const seekEntry of this.currentSegment.seekEntries) {
          const target = METADATA_ELEMENTS.find((x) => x.id === seekEntry.id);
          if (!target) {
            continue;
          }
          if (this.currentSegment[target.flag]) continue;
          let slice = this.reader.requestSliceRange(
            segmentDataStart + seekEntry.segmentPosition,
            MIN_HEADER_SIZE,
            MAX_HEADER_SIZE
          );
          if (slice instanceof Promise) slice = await slice;
          if (!slice) continue;
          const header = readElementHeader(slice);
          if (!header) continue;
          const { id, size } = header;
          if (id !== target.id) continue;
          assertDefinedSize(size);
          this.currentSegment[target.flag] = true;
          let dataSlice = this.reader.requestSlice(slice.filePos, size);
          if (dataSlice instanceof Promise) dataSlice = await dataSlice;
          if (!dataSlice) continue;
          this.readContiguousElements(dataSlice);
        }
      }
      if (this.currentSegment.timestampScale === -1) {
        this.currentSegment.timestampScale = 1e6;
        this.currentSegment.timestampFactor = 1e9 / 1e6;
      }
      for (const track of this.currentSegment.tracks) {
        if (track.defaultDurationNs !== null) {
          track.defaultDuration = this.currentSegment.timestampFactor * track.defaultDurationNs / 1e9;
        }
      }
      const idToTrack = new Map(this.currentSegment.tracks.map((x) => [x.id, x]));
      for (const cuePoint of this.currentSegment.cuePoints) {
        const track = idToTrack.get(cuePoint.trackId);
        if (track) {
          track.cuePoints.push(cuePoint);
        }
      }
      for (const track of this.currentSegment.tracks) {
        track.cuePoints.sort((a, b) => a.time - b.time);
        for (let i = 0; i < track.cuePoints.length - 1; i++) {
          const cuePoint1 = track.cuePoints[i];
          const cuePoint2 = track.cuePoints[i + 1];
          if (cuePoint1.time === cuePoint2.time) {
            track.cuePoints.splice(i + 1, 1);
            i--;
          }
        }
      }
      let trackWithMostCuePoints = null;
      let maxCuePointCount = -Infinity;
      for (const track of this.currentSegment.tracks) {
        if (track.cuePoints.length > maxCuePointCount) {
          maxCuePointCount = track.cuePoints.length;
          trackWithMostCuePoints = track;
        }
      }
      for (const track of this.currentSegment.tracks) {
        if (track.cuePoints.length === 0) {
          track.cuePoints = trackWithMostCuePoints.cuePoints;
        }
      }
      this.currentSegment = null;
    }
    async readCluster(startPos, segment) {
      if (segment.lastReadCluster?.elementStartPos === startPos) {
        return segment.lastReadCluster;
      }
      let headerSlice = this.reader.requestSliceRange(startPos, MIN_HEADER_SIZE, MAX_HEADER_SIZE);
      if (headerSlice instanceof Promise) headerSlice = await headerSlice;
      assert(headerSlice);
      const elementStartPos = startPos;
      const elementHeader = readElementHeader(headerSlice);
      assert(elementHeader);
      const id = elementHeader.id;
      assert(id === 524531317 /* Cluster */);
      let size = elementHeader.size;
      const dataStartPos = headerSlice.filePos;
      if (size === void 0) {
        const nextElementPos = await searchForNextElementId(
          this.reader,
          dataStartPos,
          LEVEL_0_AND_1_EBML_IDS,
          segment.elementEndPos
        );
        size = nextElementPos.pos - dataStartPos;
      }
      let dataSlice = this.reader.requestSlice(dataStartPos, size);
      if (dataSlice instanceof Promise) dataSlice = await dataSlice;
      const cluster = {
        segment,
        elementStartPos,
        elementEndPos: dataStartPos + size,
        dataStartPos,
        timestamp: -1,
        trackData: /* @__PURE__ */ new Map()
      };
      this.currentCluster = cluster;
      if (dataSlice) {
        const endPos = this.readContiguousElements(dataSlice, LEVEL_0_AND_1_EBML_IDS);
        cluster.elementEndPos = endPos;
      }
      for (const [, trackData] of cluster.trackData) {
        const track = trackData.track;
        assert(trackData.blocks.length > 0);
        let hasLacedBlocks = false;
        for (let i = 0; i < trackData.blocks.length; i++) {
          const block = trackData.blocks[i];
          block.timestamp += cluster.timestamp;
          hasLacedBlocks ||= block.lacing !== 0 /* None */;
        }
        trackData.presentationTimestamps = trackData.blocks.map((block, i) => ({ timestamp: block.timestamp, blockIndex: i })).sort((a, b) => a.timestamp - b.timestamp);
        for (let i = 0; i < trackData.presentationTimestamps.length; i++) {
          const currentEntry = trackData.presentationTimestamps[i];
          const currentBlock = trackData.blocks[currentEntry.blockIndex];
          if (trackData.firstKeyFrameTimestamp === null && currentBlock.isKeyFrame) {
            trackData.firstKeyFrameTimestamp = currentBlock.timestamp;
          }
          if (i < trackData.presentationTimestamps.length - 1) {
            const nextEntry = trackData.presentationTimestamps[i + 1];
            currentBlock.duration = nextEntry.timestamp - currentBlock.timestamp;
          } else if (currentBlock.duration === 0) {
            if (track.defaultDuration != null) {
              if (currentBlock.lacing === 0 /* None */) {
                currentBlock.duration = track.defaultDuration;
              } else {
              }
            }
          }
        }
        if (hasLacedBlocks) {
          this.expandLacedBlocks(trackData.blocks, track);
          trackData.presentationTimestamps = trackData.blocks.map((block, i) => ({ timestamp: block.timestamp, blockIndex: i })).sort((a, b) => a.timestamp - b.timestamp);
        }
        const firstBlock = trackData.blocks[trackData.presentationTimestamps[0].blockIndex];
        const lastBlock = trackData.blocks[last(trackData.presentationTimestamps).blockIndex];
        trackData.startTimestamp = firstBlock.timestamp;
        trackData.endTimestamp = lastBlock.timestamp + lastBlock.duration;
        const insertionIndex = binarySearchLessOrEqual(
          track.clusterPositionCache,
          trackData.startTimestamp,
          (x) => x.startTimestamp
        );
        if (insertionIndex === -1 || track.clusterPositionCache[insertionIndex].elementStartPos !== elementStartPos) {
          track.clusterPositionCache.splice(insertionIndex + 1, 0, {
            elementStartPos: cluster.elementStartPos,
            startTimestamp: trackData.startTimestamp
          });
        }
      }
      segment.lastReadCluster = cluster;
      return cluster;
    }
    getTrackDataInCluster(cluster, trackNumber) {
      let trackData = cluster.trackData.get(trackNumber);
      if (!trackData) {
        const track = cluster.segment.tracks.find((x) => x.id === trackNumber);
        if (!track) {
          return null;
        }
        trackData = {
          track,
          startTimestamp: 0,
          endTimestamp: 0,
          firstKeyFrameTimestamp: null,
          blocks: [],
          presentationTimestamps: []
        };
        cluster.trackData.set(trackNumber, trackData);
      }
      return trackData;
    }
    expandLacedBlocks(blocks, track) {
      for (let blockIndex = 0; blockIndex < blocks.length; blockIndex++) {
        const originalBlock = blocks[blockIndex];
        if (originalBlock.lacing === 0 /* None */) {
          continue;
        }
        if (!originalBlock.decoded) {
          originalBlock.data = this.decodeBlockData(track, originalBlock.data);
          originalBlock.decoded = true;
        }
        const slice = FileSlice4.tempFromBytes(originalBlock.data);
        const frameSizes = [];
        const frameCount = readU8(slice) + 1;
        switch (originalBlock.lacing) {
          case 1 /* Xiph */:
            {
              let totalUsedSize = 0;
              for (let i = 0; i < frameCount - 1; i++) {
                let frameSize = 0;
                while (slice.bufferPos < slice.length) {
                  const value = readU8(slice);
                  frameSize += value;
                  if (value < 255) {
                    frameSizes.push(frameSize);
                    totalUsedSize += frameSize;
                    break;
                  }
                }
              }
              frameSizes.push(slice.length - (slice.bufferPos + totalUsedSize));
            }
            ;
            break;
          case 2 /* FixedSize */:
            {
              const totalDataSize = slice.length - 1;
              const frameSize = Math.floor(totalDataSize / frameCount);
              for (let i = 0; i < frameCount; i++) {
                frameSizes.push(frameSize);
              }
            }
            ;
            break;
          case 3 /* Ebml */:
            {
              const firstResult = readVarInt(slice);
              assert(firstResult !== null);
              let currentSize = firstResult;
              frameSizes.push(currentSize);
              let totalUsedSize = currentSize;
              for (let i = 1; i < frameCount - 1; i++) {
                const startPos = slice.bufferPos;
                const diffResult = readVarInt(slice);
                assert(diffResult !== null);
                const unsignedDiff = diffResult;
                const width = slice.bufferPos - startPos;
                const bias = (1 << width * 7 - 1) - 1;
                const diff = unsignedDiff - bias;
                currentSize += diff;
                frameSizes.push(currentSize);
                totalUsedSize += currentSize;
              }
              frameSizes.push(slice.length - (slice.bufferPos + totalUsedSize));
            }
            ;
            break;
          default:
            assert(false);
        }
        assert(frameSizes.length === frameCount);
        blocks.splice(blockIndex, 1);
        const blockDuration = originalBlock.duration || frameCount * (track.defaultDuration ?? 0);
        for (let i = 0; i < frameCount; i++) {
          const frameSize = frameSizes[i];
          const frameData = readBytes(slice, frameSize);
          const frameTimestamp = originalBlock.timestamp + blockDuration * i / frameCount;
          const frameDuration = blockDuration / frameCount;
          blocks.splice(blockIndex + i, 0, {
            timestamp: frameTimestamp,
            duration: frameDuration,
            isKeyFrame: originalBlock.isKeyFrame,
            data: frameData,
            lacing: 0 /* None */,
            decoded: true,
            postProcessed: false,
            mainAdditional: originalBlock.mainAdditional
          });
        }
        blockIndex += frameCount;
        blockIndex--;
      }
    }
    async loadSegmentMetadata(segment) {
      for (const seekEntry of segment.seekEntries) {
        if (seekEntry.id === 307544935 /* Tags */ && !segment.tagsSeen) {
        } else if (seekEntry.id === 423732329 /* Attachments */ && !segment.attachmentsSeen) {
        } else {
          continue;
        }
        let slice = this.reader.requestSliceRange(
          segment.dataStartPos + seekEntry.segmentPosition,
          MIN_HEADER_SIZE,
          MAX_HEADER_SIZE
        );
        if (slice instanceof Promise) slice = await slice;
        if (!slice) continue;
        const header = readElementHeader(slice);
        if (!header || header.id !== seekEntry.id) continue;
        const { size } = header;
        assertDefinedSize(size);
        assert(!this.currentSegment);
        this.currentSegment = segment;
        let dataSlice = this.reader.requestSlice(slice.filePos, size);
        if (dataSlice instanceof Promise) dataSlice = await dataSlice;
        if (dataSlice) {
          this.readContiguousElements(dataSlice);
        }
        this.currentSegment = null;
        if (seekEntry.id === 307544935 /* Tags */) {
          segment.tagsSeen = true;
        } else if (seekEntry.id === 423732329 /* Attachments */) {
          segment.attachmentsSeen = true;
        }
      }
    }
    readContiguousElements(slice, stopIds) {
      while (slice.remainingLength >= MIN_HEADER_SIZE) {
        const startPos = slice.filePos;
        const foundElement = this.traverseElement(slice, stopIds);
        if (!foundElement) {
          return startPos;
        }
      }
      return slice.filePos;
    }
    traverseElement(slice, stopIds) {
      const header = readElementHeader(slice);
      if (!header) {
        return false;
      }
      if (stopIds && stopIds.includes(header.id)) {
        return false;
      }
      const { id, size } = header;
      const dataStartPos = slice.filePos;
      assertDefinedSize(size);
      switch (id) {
        case 17026 /* DocType */:
          {
            this.isWebM = readAsciiString(slice, size) === "webm";
          }
          ;
          break;
        case 19899 /* Seek */:
          {
            if (!this.currentSegment) break;
            const seekEntry = { id: -1, segmentPosition: -1 };
            this.currentSegment.seekEntries.push(seekEntry);
            this.readContiguousElements(slice.slice(dataStartPos, size));
            if (seekEntry.id === -1 || seekEntry.segmentPosition === -1) {
              this.currentSegment.seekEntries.pop();
            }
          }
          ;
          break;
        case 21419 /* SeekID */:
          {
            const lastSeekEntry = this.currentSegment?.seekEntries[this.currentSegment.seekEntries.length - 1];
            if (!lastSeekEntry) break;
            lastSeekEntry.id = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21420 /* SeekPosition */:
          {
            const lastSeekEntry = this.currentSegment?.seekEntries[this.currentSegment.seekEntries.length - 1];
            if (!lastSeekEntry) break;
            lastSeekEntry.segmentPosition = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 2807729 /* TimestampScale */:
          {
            if (!this.currentSegment) break;
            this.currentSegment.timestampScale = readUnsignedInt(slice, size);
            this.currentSegment.timestampFactor = 1e9 / this.currentSegment.timestampScale;
          }
          ;
          break;
        case 17545 /* Duration */:
          {
            if (!this.currentSegment) break;
            this.currentSegment.duration = readFloat(slice, size);
          }
          ;
          break;
        case 174 /* TrackEntry */:
          {
            if (!this.currentSegment) break;
            this.currentTrack = {
              id: -1,
              segment: this.currentSegment,
              demuxer: this,
              clusterPositionCache: [],
              cuePoints: [],
              disposition: {
                ...DEFAULT_TRACK_DISPOSITION,
                primary: false
              },
              trackBacking: null,
              codecId: null,
              codecPrivate: null,
              defaultDuration: null,
              defaultDurationNs: null,
              name: null,
              languageCode: "eng",
              // The default in Matroska
              hasLanguageBcp47: false,
              decodingInstructions: [],
              info: null
            };
            this.readContiguousElements(slice.slice(dataStartPos, size));
            if (!this.currentTrack) {
              break;
            }
            if (this.currentTrack.decodingInstructions.some((instruction) => {
              return instruction.data?.type !== "decompress" || instruction.scope !== 1 /* Block */ || instruction.data.algorithm !== 3 /* HeaderStripping */;
            })) {
              Logging._warn(`Track #${this.currentTrack.id} has an unsupported content encoding; dropping.`);
              this.currentTrack = null;
            }
            if (this.currentTrack && this.currentTrack.id !== -1 && this.currentTrack.codecId && this.currentTrack.info) {
              const slashIndex = this.currentTrack.codecId.indexOf("/");
              const codecIdWithoutSuffix = slashIndex === -1 ? this.currentTrack.codecId : this.currentTrack.codecId.slice(0, slashIndex);
              if (this.currentTrack.info.type === "video" && this.currentTrack.info.width !== -1 && this.currentTrack.info.height !== -1) {
                this.currentTrack.info.squarePixelWidth = this.currentTrack.info.width;
                this.currentTrack.info.squarePixelHeight = this.currentTrack.info.height;
                if (this.currentTrack.info.displayWidth !== null && this.currentTrack.info.displayHeight !== null) {
                  const num = this.currentTrack.info.displayWidth * this.currentTrack.info.height;
                  const den = this.currentTrack.info.displayHeight * this.currentTrack.info.width;
                  if (num > 0 && den > 0) {
                    if (num > den) {
                      this.currentTrack.info.squarePixelWidth = Math.round(
                        this.currentTrack.info.width * num / den
                      );
                    } else {
                      this.currentTrack.info.squarePixelHeight = Math.round(
                        this.currentTrack.info.height * den / num
                      );
                    }
                  }
                }
                if (this.currentTrack.codecId === CODEC_STRING_MAP.avc) {
                  this.currentTrack.info.codec = "avc";
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                } else if (this.currentTrack.codecId === CODEC_STRING_MAP.hevc) {
                  this.currentTrack.info.codec = "hevc";
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.vp8) {
                  this.currentTrack.info.codec = "vp8";
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.vp9) {
                  this.currentTrack.info.codec = "vp9";
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.av1) {
                  this.currentTrack.info.codec = "av1";
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.prores) {
                  const format = this.currentTrack.codecPrivate ? textDecoder.decode(this.currentTrack.codecPrivate) : "";
                  if (PRORES_FOURCCS.includes(format)) {
                    this.currentTrack.info.codec = "prores";
                    this.currentTrack.info.proresFormat = format;
                  } else {
                  }
                }
                const videoTrack = this.currentTrack;
                this.currentTrack.trackBacking = new MatroskaVideoTrackBacking(videoTrack);
                this.currentSegment.tracks.push(this.currentTrack);
              } else if (this.currentTrack.info.type === "audio") {
                if (codecIdWithoutSuffix === CODEC_STRING_MAP.aac) {
                  this.currentTrack.info.codec = "aac";
                  this.currentTrack.info.aacCodecInfo = {
                    isMpeg2: this.currentTrack.codecId.includes("MPEG2"),
                    objectType: null
                  };
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                } else if (this.currentTrack.codecId === CODEC_STRING_MAP.mp3) {
                  this.currentTrack.info.codec = "mp3";
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.opus) {
                  this.currentTrack.info.codec = "opus";
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                  this.currentTrack.info.sampleRate = OPUS_SAMPLE_RATE;
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.vorbis) {
                  this.currentTrack.info.codec = "vorbis";
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.flac) {
                  this.currentTrack.info.codec = "flac";
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.ac3) {
                  this.currentTrack.info.codec = "ac3";
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                } else if (codecIdWithoutSuffix === CODEC_STRING_MAP.eac3) {
                  this.currentTrack.info.codec = "eac3";
                  this.currentTrack.info.codecDescription = this.currentTrack.codecPrivate;
                } else if (this.currentTrack.codecId === "A_PCM/INT/LIT") {
                  if (this.currentTrack.info.bitDepth === 8) {
                    this.currentTrack.info.codec = "pcm-u8";
                  } else if (this.currentTrack.info.bitDepth === 16) {
                    this.currentTrack.info.codec = "pcm-s16";
                  } else if (this.currentTrack.info.bitDepth === 24) {
                    this.currentTrack.info.codec = "pcm-s24";
                  } else if (this.currentTrack.info.bitDepth === 32) {
                    this.currentTrack.info.codec = "pcm-s32";
                  }
                } else if (this.currentTrack.codecId === "A_PCM/INT/BIG") {
                  if (this.currentTrack.info.bitDepth === 8) {
                    this.currentTrack.info.codec = "pcm-u8";
                  } else if (this.currentTrack.info.bitDepth === 16) {
                    this.currentTrack.info.codec = "pcm-s16be";
                  } else if (this.currentTrack.info.bitDepth === 24) {
                    this.currentTrack.info.codec = "pcm-s24be";
                  } else if (this.currentTrack.info.bitDepth === 32) {
                    this.currentTrack.info.codec = "pcm-s32be";
                  }
                } else if (this.currentTrack.codecId === "A_PCM/FLOAT/IEEE") {
                  if (this.currentTrack.info.bitDepth === 32) {
                    this.currentTrack.info.codec = "pcm-f32";
                  } else if (this.currentTrack.info.bitDepth === 64) {
                    this.currentTrack.info.codec = "pcm-f64";
                  }
                }
                const audioTrack = this.currentTrack;
                this.currentTrack.trackBacking = new MatroskaAudioTrackBacking(audioTrack);
                this.currentSegment.tracks.push(this.currentTrack);
              }
            }
            this.currentTrack = null;
          }
          ;
          break;
        case 215 /* TrackNumber */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.id = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 131 /* TrackType */:
          {
            if (!this.currentTrack) break;
            const type = readUnsignedInt(slice, size);
            if (type === 1) {
              this.currentTrack.info = {
                type: "video",
                width: -1,
                height: -1,
                displayWidth: null,
                displayHeight: null,
                displayUnit: null,
                squarePixelWidth: -1,
                squarePixelHeight: -1,
                rotation: 0,
                codec: null,
                codecDescription: null,
                colorSpace: null,
                alphaMode: false,
                proresFormat: null
              };
            } else if (type === 2) {
              this.currentTrack.info = {
                type: "audio",
                numberOfChannels: 1,
                // Default value
                sampleRate: 8e3,
                // Default value
                bitDepth: -1,
                codec: null,
                codecDescription: null,
                aacCodecInfo: null
              };
            }
          }
          ;
          break;
        case 185 /* FlagEnabled */:
          {
            if (!this.currentTrack) break;
            const enabled = readUnsignedInt(slice, size);
            if (!enabled) {
              this.currentTrack = null;
            }
          }
          ;
          break;
        case 136 /* FlagDefault */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.disposition.default = !!readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21930 /* FlagForced */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.disposition.forced = !!readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21934 /* FlagOriginal */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.disposition.original = !!readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21931 /* FlagHearingImpaired */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.disposition.hearingImpaired = !!readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21932 /* FlagVisualImpaired */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.disposition.visuallyImpaired = !!readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21935 /* FlagCommentary */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.disposition.commentary = !!readUnsignedInt(slice, size);
          }
          ;
          break;
        case 134 /* CodecID */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.codecId = readAsciiString(slice, size);
          }
          ;
          break;
        case 25506 /* CodecPrivate */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.codecPrivate = readBytes(slice, size);
          }
          ;
          break;
        case 2352003 /* DefaultDuration */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.defaultDurationNs = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21358 /* Name */:
          {
            if (!this.currentTrack) break;
            this.currentTrack.name = readUnicodeString(slice, size);
          }
          ;
          break;
        case 2274716 /* Language */:
          {
            if (!this.currentTrack) break;
            if (this.currentTrack.hasLanguageBcp47) {
              break;
            }
            this.currentTrack.languageCode = readAsciiString(slice, size);
            if (!isIso639Dash2LanguageCode(this.currentTrack.languageCode)) {
              this.currentTrack.languageCode = UNDETERMINED_LANGUAGE;
            }
          }
          ;
          break;
        case 2274717 /* LanguageBCP47 */:
          {
            if (!this.currentTrack) break;
            const bcp47 = readAsciiString(slice, size);
            const languageSubtag = bcp47.split("-")[0];
            if (languageSubtag) {
              this.currentTrack.languageCode = languageSubtag;
            } else {
              this.currentTrack.languageCode = UNDETERMINED_LANGUAGE;
            }
            this.currentTrack.hasLanguageBcp47 = true;
          }
          ;
          break;
        case 224 /* Video */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 176 /* PixelWidth */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.currentTrack.info.width = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 186 /* PixelHeight */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.currentTrack.info.height = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21680 /* DisplayWidth */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.currentTrack.info.displayWidth = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21690 /* DisplayHeight */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.currentTrack.info.displayHeight = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21682 /* DisplayUnit */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.currentTrack.info.displayUnit = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 21440 /* AlphaMode */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.currentTrack.info.alphaMode = readUnsignedInt(slice, size) === 1;
          }
          ;
          break;
        case 21936 /* Colour */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.currentTrack.info.colorSpace = {};
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 21937 /* MatrixCoefficients */:
          {
            if (this.currentTrack?.info?.type !== "video" || !this.currentTrack.info.colorSpace) break;
            const matrixCoefficients = readUnsignedInt(slice, size);
            const mapped = MATRIX_COEFFICIENTS_MAP_INVERSE[matrixCoefficients] ?? null;
            this.currentTrack.info.colorSpace.matrix = mapped;
          }
          ;
          break;
        case 21945 /* Range */:
          {
            if (this.currentTrack?.info?.type !== "video" || !this.currentTrack.info.colorSpace) break;
            this.currentTrack.info.colorSpace.fullRange = readUnsignedInt(slice, size) === 2;
          }
          ;
          break;
        case 21946 /* TransferCharacteristics */:
          {
            if (this.currentTrack?.info?.type !== "video" || !this.currentTrack.info.colorSpace) break;
            const transferCharacteristics = readUnsignedInt(slice, size);
            const mapped = TRANSFER_CHARACTERISTICS_MAP_INVERSE[transferCharacteristics] ?? null;
            this.currentTrack.info.colorSpace.transfer = mapped;
          }
          ;
          break;
        case 21947 /* Primaries */:
          {
            if (this.currentTrack?.info?.type !== "video" || !this.currentTrack.info.colorSpace) break;
            const primaries = readUnsignedInt(slice, size);
            const mapped = COLOR_PRIMARIES_MAP_INVERSE[primaries] ?? null;
            this.currentTrack.info.colorSpace.primaries = mapped;
          }
          ;
          break;
        case 30320 /* Projection */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 30325 /* ProjectionPoseRoll */:
          {
            if (this.currentTrack?.info?.type !== "video") break;
            const rotation = readFloat(slice, size);
            const flippedRotation = -rotation;
            try {
              this.currentTrack.info.rotation = normalizeRotation(flippedRotation);
            } catch {
            }
          }
          ;
          break;
        case 225 /* Audio */:
          {
            if (this.currentTrack?.info?.type !== "audio") break;
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 181 /* SamplingFrequency */:
          {
            if (this.currentTrack?.info?.type !== "audio") break;
            this.currentTrack.info.sampleRate = readFloat(slice, size);
          }
          ;
          break;
        case 159 /* Channels */:
          {
            if (this.currentTrack?.info?.type !== "audio") break;
            this.currentTrack.info.numberOfChannels = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 25188 /* BitDepth */:
          {
            if (this.currentTrack?.info?.type !== "audio") break;
            this.currentTrack.info.bitDepth = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 187 /* CuePoint */:
          {
            if (!this.currentSegment) break;
            this.readContiguousElements(slice.slice(dataStartPos, size));
            this.currentCueTime = null;
          }
          ;
          break;
        case 179 /* CueTime */:
          {
            this.currentCueTime = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 183 /* CueTrackPositions */:
          {
            if (this.currentCueTime === null) break;
            assert(this.currentSegment);
            const cuePoint = { time: this.currentCueTime, trackId: -1, clusterPosition: -1 };
            this.currentSegment.cuePoints.push(cuePoint);
            this.readContiguousElements(slice.slice(dataStartPos, size));
            if (cuePoint.trackId === -1 || cuePoint.clusterPosition === -1) {
              this.currentSegment.cuePoints.pop();
            }
          }
          ;
          break;
        case 247 /* CueTrack */:
          {
            const lastCuePoint = this.currentSegment?.cuePoints[this.currentSegment.cuePoints.length - 1];
            if (!lastCuePoint) break;
            lastCuePoint.trackId = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 241 /* CueClusterPosition */:
          {
            const lastCuePoint = this.currentSegment?.cuePoints[this.currentSegment.cuePoints.length - 1];
            if (!lastCuePoint) break;
            assert(this.currentSegment);
            lastCuePoint.clusterPosition = this.currentSegment.dataStartPos + readUnsignedInt(slice, size);
          }
          ;
          break;
        case 231 /* Timestamp */:
          {
            if (!this.currentCluster) break;
            this.currentCluster.timestamp = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 163 /* SimpleBlock */:
          {
            if (!this.currentCluster) break;
            const trackNumber = readVarInt(slice);
            if (trackNumber === null) break;
            const trackData = this.getTrackDataInCluster(this.currentCluster, trackNumber);
            if (!trackData) break;
            const relativeTimestamp = readI16Be(slice);
            const flags = readU8(slice);
            const lacing = flags >> 1 & 3;
            let isKeyFrame = !!(flags & 128);
            if (trackData.track.info?.type === "audio" && trackData.track.info.codec) {
              isKeyFrame = true;
            }
            const blockData = readBytes(slice, size - (slice.filePos - dataStartPos));
            const hasDecodingInstructions = trackData.track.decodingInstructions.length > 0;
            trackData.blocks.push({
              timestamp: relativeTimestamp,
              // We'll add the cluster's timestamp to this later
              duration: 0,
              // Will set later
              isKeyFrame,
              data: blockData,
              lacing,
              decoded: !hasDecodingInstructions,
              postProcessed: false,
              mainAdditional: null
            });
          }
          ;
          break;
        case 160 /* BlockGroup */:
          {
            if (!this.currentCluster) break;
            this.readContiguousElements(slice.slice(dataStartPos, size));
            this.currentBlock = null;
          }
          ;
          break;
        case 161 /* Block */:
          {
            if (!this.currentCluster) break;
            const trackNumber = readVarInt(slice);
            if (trackNumber === null) break;
            const trackData = this.getTrackDataInCluster(this.currentCluster, trackNumber);
            if (!trackData) break;
            const relativeTimestamp = readI16Be(slice);
            const flags = readU8(slice);
            const lacing = flags >> 1 & 3;
            const blockData = readBytes(slice, size - (slice.filePos - dataStartPos));
            const hasDecodingInstructions = trackData.track.decodingInstructions.length > 0;
            this.currentBlock = {
              timestamp: relativeTimestamp,
              // We'll add the cluster's timestamp to this later
              duration: 0,
              // Will set later
              isKeyFrame: true,
              data: blockData,
              lacing,
              decoded: !hasDecodingInstructions,
              postProcessed: false,
              mainAdditional: null
            };
            trackData.blocks.push(this.currentBlock);
          }
          ;
          break;
        case 30113 /* BlockAdditions */:
          {
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 166 /* BlockMore */:
          {
            if (!this.currentBlock) break;
            this.currentBlockAdditional = {
              addId: 1,
              data: null
            };
            this.readContiguousElements(slice.slice(dataStartPos, size));
            if (this.currentBlockAdditional.data && this.currentBlockAdditional.addId === 1) {
              this.currentBlock.mainAdditional = this.currentBlockAdditional.data;
            }
            this.currentBlockAdditional = null;
          }
          ;
          break;
        case 165 /* BlockAdditional */:
          {
            if (!this.currentBlockAdditional) break;
            this.currentBlockAdditional.data = readBytes(slice, size);
          }
          ;
          break;
        case 238 /* BlockAddID */:
          {
            if (!this.currentBlockAdditional) break;
            this.currentBlockAdditional.addId = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 155 /* BlockDuration */:
          {
            if (!this.currentBlock) break;
            this.currentBlock.duration = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 251 /* ReferenceBlock */:
          {
            if (!this.currentBlock) break;
            this.currentBlock.isKeyFrame = false;
          }
          ;
          break;
        case 29555 /* Tag */:
          {
            this.currentTagTargetIsMovie = true;
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 25536 /* Targets */:
          {
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 26826 /* TargetTypeValue */:
          {
            const targetTypeValue = readUnsignedInt(slice, size);
            if (targetTypeValue !== 50) {
              this.currentTagTargetIsMovie = false;
            }
          }
          ;
          break;
        case 25541 /* TagTrackUID */:
        case 25545 /* TagEditionUID */:
        case 25540 /* TagChapterUID */:
        case 25542 /* TagAttachmentUID */:
          {
            this.currentTagTargetIsMovie = false;
          }
          ;
          break;
        case 26568 /* SimpleTag */:
          {
            if (!this.currentTagTargetIsMovie) break;
            this.currentSimpleTagName = null;
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 17827 /* TagName */:
          {
            this.currentSimpleTagName = readUnicodeString(slice, size);
          }
          ;
          break;
        case 17543 /* TagString */:
          {
            if (!this.currentSimpleTagName) break;
            const value = readUnicodeString(slice, size);
            this.processTagValue(this.currentSimpleTagName, value);
          }
          ;
          break;
        case 17541 /* TagBinary */:
          {
            if (!this.currentSimpleTagName) break;
            const value = readBytes(slice, size);
            this.processTagValue(this.currentSimpleTagName, value);
          }
          ;
          break;
        case 24999 /* AttachedFile */:
          {
            if (!this.currentSegment) break;
            this.currentAttachedFile = {
              fileUid: null,
              fileName: null,
              fileMediaType: null,
              fileData: null,
              fileDescription: null
            };
            this.readContiguousElements(slice.slice(dataStartPos, size));
            const tags = this.currentSegment.metadataTags;
            if (this.currentAttachedFile.fileUid && this.currentAttachedFile.fileData) {
              tags.raw ??= {};
              tags.raw[this.currentAttachedFile.fileUid.toString()] = new AttachedFile(
                this.currentAttachedFile.fileData,
                this.currentAttachedFile.fileMediaType ?? void 0,
                this.currentAttachedFile.fileName ?? void 0,
                this.currentAttachedFile.fileDescription ?? void 0
              );
            }
            if (this.currentAttachedFile.fileMediaType?.startsWith("image/") && this.currentAttachedFile.fileData) {
              const fileName = this.currentAttachedFile.fileName;
              let kind = "unknown";
              if (fileName) {
                const lowerName = fileName.toLowerCase();
                if (lowerName.startsWith("cover.")) {
                  kind = "coverFront";
                } else if (lowerName.startsWith("back.")) {
                  kind = "coverBack";
                }
              }
              tags.images ??= [];
              tags.images.push({
                data: this.currentAttachedFile.fileData,
                mimeType: this.currentAttachedFile.fileMediaType,
                kind,
                name: this.currentAttachedFile.fileName ?? void 0,
                description: this.currentAttachedFile.fileDescription ?? void 0
              });
            }
            this.currentAttachedFile = null;
          }
          ;
          break;
        case 18094 /* FileUID */:
          {
            if (!this.currentAttachedFile) break;
            this.currentAttachedFile.fileUid = readUnsignedBigInt(slice, size);
          }
          ;
          break;
        case 18030 /* FileName */:
          {
            if (!this.currentAttachedFile) break;
            this.currentAttachedFile.fileName = readUnicodeString(slice, size);
          }
          ;
          break;
        case 18016 /* FileMediaType */:
          {
            if (!this.currentAttachedFile) break;
            this.currentAttachedFile.fileMediaType = readAsciiString(slice, size);
          }
          ;
          break;
        case 18012 /* FileData */:
          {
            if (!this.currentAttachedFile) break;
            this.currentAttachedFile.fileData = readBytes(slice, size);
          }
          ;
          break;
        case 18046 /* FileDescription */:
          {
            if (!this.currentAttachedFile) break;
            this.currentAttachedFile.fileDescription = readUnicodeString(slice, size);
          }
          ;
          break;
        case 28032 /* ContentEncodings */:
          {
            if (!this.currentTrack) break;
            this.readContiguousElements(slice.slice(dataStartPos, size));
            this.currentTrack.decodingInstructions.sort((a, b) => b.order - a.order);
          }
          ;
          break;
        case 25152 /* ContentEncoding */:
          {
            this.currentDecodingInstruction = {
              order: 0,
              scope: 1 /* Block */,
              data: null
            };
            this.readContiguousElements(slice.slice(dataStartPos, size));
            if (this.currentDecodingInstruction.data) {
              this.currentTrack.decodingInstructions.push(this.currentDecodingInstruction);
            }
            this.currentDecodingInstruction = null;
          }
          ;
          break;
        case 20529 /* ContentEncodingOrder */:
          {
            if (!this.currentDecodingInstruction) break;
            this.currentDecodingInstruction.order = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 20530 /* ContentEncodingScope */:
          {
            if (!this.currentDecodingInstruction) break;
            this.currentDecodingInstruction.scope = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 20532 /* ContentCompression */:
          {
            if (!this.currentDecodingInstruction) break;
            this.currentDecodingInstruction.data = {
              type: "decompress",
              algorithm: 0 /* Zlib */,
              settings: null
            };
            this.readContiguousElements(slice.slice(dataStartPos, size));
          }
          ;
          break;
        case 16980 /* ContentCompAlgo */:
          {
            if (this.currentDecodingInstruction?.data?.type !== "decompress") break;
            this.currentDecodingInstruction.data.algorithm = readUnsignedInt(slice, size);
          }
          ;
          break;
        case 16981 /* ContentCompSettings */:
          {
            if (this.currentDecodingInstruction?.data?.type !== "decompress") break;
            this.currentDecodingInstruction.data.settings = readBytes(slice, size);
          }
          ;
          break;
        case 20533 /* ContentEncryption */:
          {
            if (!this.currentDecodingInstruction) break;
            this.currentDecodingInstruction.data = {
              type: "decrypt"
            };
          }
          ;
          break;
      }
      slice.filePos = dataStartPos + size;
      return true;
    }
    decodeBlockData(track, rawData) {
      assert(track.decodingInstructions.length > 0);
      let currentData = rawData;
      for (const instruction of track.decodingInstructions) {
        assert(instruction.data);
        switch (instruction.data.type) {
          case "decompress":
            {
              switch (instruction.data.algorithm) {
                case 3 /* HeaderStripping */:
                  {
                    if (instruction.data.settings && instruction.data.settings.length > 0) {
                      const prefix = instruction.data.settings;
                      const newData = new Uint8Array(prefix.length + currentData.length);
                      newData.set(prefix, 0);
                      newData.set(currentData, prefix.length);
                      currentData = newData;
                    }
                  }
                  ;
                  break;
                default:
                  {
                  }
                  ;
              }
            }
            ;
            break;
          default:
            {
            }
            ;
        }
      }
      return currentData;
    }
    processTagValue(name, value) {
      if (!this.currentSegment?.metadataTags) return;
      const metadataTags = this.currentSegment.metadataTags;
      metadataTags.raw ??= {};
      metadataTags.raw[name] ??= value;
      if (typeof value === "string") {
        switch (name.toLowerCase()) {
          case "title":
            {
              metadataTags.title ??= value;
            }
            ;
            break;
          case "description":
            {
              metadataTags.description ??= value;
            }
            ;
            break;
          case "artist":
            {
              metadataTags.artist ??= value;
            }
            ;
            break;
          case "album":
            {
              metadataTags.album ??= value;
            }
            ;
            break;
          case "album_artist":
            {
              metadataTags.albumArtist ??= value;
            }
            ;
            break;
          case "genre":
            {
              metadataTags.genre ??= value;
            }
            ;
            break;
          case "comment":
            {
              metadataTags.comment ??= value;
            }
            ;
            break;
          case "lyrics":
            {
              metadataTags.lyrics ??= value;
            }
            ;
            break;
          case "date":
            {
              const date = new Date(value);
              if (!Number.isNaN(date.getTime())) {
                metadataTags.date ??= date;
              }
            }
            ;
            break;
          case "track_number":
          case "part_number":
            {
              const parts = value.split("/");
              const trackNum = Number.parseInt(parts[0], 10);
              const tracksTotal = parts[1] && Number.parseInt(parts[1], 10);
              if (Number.isInteger(trackNum) && trackNum > 0) {
                metadataTags.trackNumber ??= trackNum;
              }
              if (tracksTotal && Number.isInteger(tracksTotal) && tracksTotal > 0) {
                metadataTags.tracksTotal ??= tracksTotal;
              }
            }
            ;
            break;
          case "disc_number":
          case "disc":
            {
              const discParts = value.split("/");
              const discNum = Number.parseInt(discParts[0], 10);
              const discsTotal = discParts[1] && Number.parseInt(discParts[1], 10);
              if (Number.isInteger(discNum) && discNum > 0) {
                metadataTags.discNumber ??= discNum;
              }
              if (discsTotal && Number.isInteger(discsTotal) && discsTotal > 0) {
                metadataTags.discsTotal ??= discsTotal;
              }
            }
            ;
            break;
        }
      }
    }
  };
  var MatroskaTrackBacking = class {
    constructor(internalTrack) {
      this.internalTrack = internalTrack;
      this.packetToClusterLocation = /* @__PURE__ */ new WeakMap();
    }
    getId() {
      return this.internalTrack.id;
    }
    getNumber() {
      const demuxer = this.internalTrack.demuxer;
      const trackType = this.internalTrack.trackBacking.getType();
      let number = 0;
      for (const segment of demuxer.segments) {
        for (const track of segment.tracks) {
          if (track.trackBacking.getType() === trackType) {
            number++;
          }
          if (track === this.internalTrack) {
            break;
          }
        }
      }
      return number;
    }
    getCodec() {
      throw new Error("Not implemented on base class.");
    }
    getInternalCodecId() {
      return this.internalTrack.codecId;
    }
    getName() {
      return this.internalTrack.name;
    }
    getLanguageCode() {
      return this.internalTrack.languageCode;
    }
    getTimeResolution() {
      return this.internalTrack.segment.timestampFactor;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getDisposition() {
      return this.internalTrack.disposition;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      const segment = this.internalTrack.segment;
      if (segment.duration <= 0) {
        return null;
      }
      let endTimestamp = segment.duration / segment.timestampFactor;
      const firstPacket = await this.getFirstPacket({ metadataOnly: true });
      endTimestamp += firstPacket?.timestamp ?? 0;
      return endTimestamp;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    async getFirstPacket(options) {
      return this.performClusterLookup(
        null,
        (cluster) => {
          const trackData = cluster.trackData.get(this.internalTrack.id);
          if (trackData) {
            return {
              blockIndex: 0,
              correctBlockFound: true
            };
          }
          return {
            blockIndex: -1,
            correctBlockFound: false
          };
        },
        -Infinity,
        // Use -Infinity as a search timestamp to avoid using the cues
        Infinity,
        options
      );
    }
    intoTimescale(timestamp) {
      return roundIfAlmostInteger(timestamp * this.internalTrack.segment.timestampFactor);
    }
    async getPacket(timestamp, options) {
      const timestampInTimescale = this.intoTimescale(timestamp);
      return this.performClusterLookup(
        null,
        (cluster) => {
          const trackData = cluster.trackData.get(this.internalTrack.id);
          if (!trackData) {
            return { blockIndex: -1, correctBlockFound: false };
          }
          const index = binarySearchLessOrEqual(
            trackData.presentationTimestamps,
            timestampInTimescale,
            (x) => x.timestamp
          );
          const blockIndex = index !== -1 ? trackData.presentationTimestamps[index].blockIndex : -1;
          const correctBlockFound = index !== -1 && timestampInTimescale < trackData.endTimestamp;
          return { blockIndex, correctBlockFound };
        },
        timestampInTimescale,
        timestampInTimescale,
        options
      );
    }
    async getNextPacket(packet, options) {
      const locationInCluster = this.packetToClusterLocation.get(packet);
      if (locationInCluster === void 0) {
        throw new Error("Packet was not created from this track.");
      }
      return this.performClusterLookup(
        locationInCluster.cluster,
        (cluster) => {
          if (cluster === locationInCluster.cluster) {
            const trackData = cluster.trackData.get(this.internalTrack.id);
            if (locationInCluster.blockIndex + 1 < trackData.blocks.length) {
              return {
                blockIndex: locationInCluster.blockIndex + 1,
                correctBlockFound: true
              };
            }
          } else {
            const trackData = cluster.trackData.get(this.internalTrack.id);
            if (trackData) {
              return {
                blockIndex: 0,
                correctBlockFound: true
              };
            }
          }
          return {
            blockIndex: -1,
            correctBlockFound: false
          };
        },
        -Infinity,
        // Use -Infinity as a search timestamp to avoid using the cues
        Infinity,
        options
      );
    }
    async getKeyPacket(timestamp, options) {
      const timestampInTimescale = this.intoTimescale(timestamp);
      return this.performClusterLookup(
        null,
        (cluster) => {
          const trackData = cluster.trackData.get(this.internalTrack.id);
          if (!trackData) {
            return { blockIndex: -1, correctBlockFound: false };
          }
          const index = findLastIndex(trackData.presentationTimestamps, (x) => {
            const block = trackData.blocks[x.blockIndex];
            return block.isKeyFrame && x.timestamp <= timestampInTimescale;
          });
          const blockIndex = index !== -1 ? trackData.presentationTimestamps[index].blockIndex : -1;
          const correctBlockFound = index !== -1 && timestampInTimescale < trackData.endTimestamp;
          return { blockIndex, correctBlockFound };
        },
        timestampInTimescale,
        timestampInTimescale,
        options
      );
    }
    async getNextKeyPacket(packet, options) {
      const locationInCluster = this.packetToClusterLocation.get(packet);
      if (locationInCluster === void 0) {
        throw new Error("Packet was not created from this track.");
      }
      return this.performClusterLookup(
        locationInCluster.cluster,
        (cluster) => {
          if (cluster === locationInCluster.cluster) {
            const trackData = cluster.trackData.get(this.internalTrack.id);
            const nextKeyFrameIndex = trackData.blocks.findIndex(
              (x, i) => x.isKeyFrame && i > locationInCluster.blockIndex
            );
            if (nextKeyFrameIndex !== -1) {
              return {
                blockIndex: nextKeyFrameIndex,
                correctBlockFound: true
              };
            }
          } else {
            const trackData = cluster.trackData.get(this.internalTrack.id);
            if (trackData && trackData.firstKeyFrameTimestamp !== null) {
              const keyFrameIndex = trackData.blocks.findIndex((x) => x.isKeyFrame);
              assert(keyFrameIndex !== -1);
              return {
                blockIndex: keyFrameIndex,
                correctBlockFound: true
              };
            }
          }
          return {
            blockIndex: -1,
            correctBlockFound: false
          };
        },
        -Infinity,
        // Use -Infinity as a search timestamp to avoid using the cues
        Infinity,
        options
      );
    }
    async fetchPacketInCluster(cluster, blockIndex, options) {
      if (blockIndex === -1) {
        return null;
      }
      const trackData = cluster.trackData.get(this.internalTrack.id);
      const block = trackData.blocks[blockIndex];
      assert(block);
      if (!block.decoded) {
        block.data = this.internalTrack.demuxer.decodeBlockData(this.internalTrack, block.data);
        block.decoded = true;
      }
      if (!block.postProcessed) {
        if (this.internalTrack.info?.codec === "prores") {
          const hasFrameContainer = block.data.length >= 8 && block.data[4] === 105 && block.data[5] === 99 && block.data[6] === 112 && block.data[7] === 102;
          if (!hasFrameContainer) {
            const newData = new Uint8Array(block.data.length + 8);
            const newDataView = toDataView(newData);
            newDataView.setUint32(0, newData.length, false);
            newData[4] = 105;
            newData[5] = 99;
            newData[6] = 112;
            newData[7] = 102;
            newData.set(block.data, 8);
            block.data = newData;
          }
        }
        block.postProcessed = true;
      }
      const data = options.metadataOnly ? PLACEHOLDER_DATA : block.data;
      const timestamp = block.timestamp / this.internalTrack.segment.timestampFactor;
      const duration = block.duration / this.internalTrack.segment.timestampFactor;
      const sideData = {};
      if (block.mainAdditional && this.internalTrack.info?.type === "video" && this.internalTrack.info.alphaMode) {
        sideData.alpha = options.metadataOnly ? PLACEHOLDER_DATA : block.mainAdditional;
        sideData.alphaByteLength = block.mainAdditional.byteLength;
      }
      const packet = new EncodedPacket(
        data,
        block.isKeyFrame ? "key" : "delta",
        timestamp,
        duration,
        cluster.dataStartPos + blockIndex,
        block.data.byteLength,
        sideData
      );
      this.packetToClusterLocation.set(packet, { cluster, blockIndex });
      return packet;
    }
    /** Looks for a packet in the clusters while trying to load as few clusters as possible to retrieve it. */
    async performClusterLookup(startCluster, getMatchInCluster, searchTimestamp, latestTimestamp, options) {
      const { demuxer, segment } = this.internalTrack;
      let currentCluster = null;
      let bestCluster = null;
      let bestBlockIndex = -1;
      if (startCluster) {
        const { blockIndex, correctBlockFound } = getMatchInCluster(startCluster);
        if (correctBlockFound) {
          return this.fetchPacketInCluster(startCluster, blockIndex, options);
        }
        if (blockIndex !== -1) {
          bestCluster = startCluster;
          bestBlockIndex = blockIndex;
        }
      }
      const cuePointIndex = binarySearchLessOrEqual(
        this.internalTrack.cuePoints,
        searchTimestamp,
        (x) => x.time
      );
      const cuePoint = cuePointIndex !== -1 ? this.internalTrack.cuePoints[cuePointIndex] : null;
      const positionCacheIndex = binarySearchLessOrEqual(
        this.internalTrack.clusterPositionCache,
        searchTimestamp,
        (x) => x.startTimestamp
      );
      const positionCacheEntry = positionCacheIndex !== -1 ? this.internalTrack.clusterPositionCache[positionCacheIndex] : null;
      const lookupEntryPosition = Math.max(
        cuePoint?.clusterPosition ?? 0,
        positionCacheEntry?.elementStartPos ?? 0
      ) || null;
      let currentPos;
      if (!startCluster) {
        currentPos = lookupEntryPosition ?? segment.clusterSeekStartPos;
      } else {
        if (lookupEntryPosition === null || startCluster.elementStartPos >= lookupEntryPosition) {
          currentPos = startCluster.elementEndPos;
          currentCluster = startCluster;
        } else {
          currentPos = lookupEntryPosition;
        }
      }
      while (segment.elementEndPos === null || currentPos <= segment.elementEndPos - MIN_HEADER_SIZE) {
        if (currentCluster) {
          const trackData = currentCluster.trackData.get(this.internalTrack.id);
          if (trackData && trackData.startTimestamp > latestTimestamp) {
            break;
          }
        }
        let slice = demuxer.reader.requestSliceRange(currentPos, MIN_HEADER_SIZE, MAX_HEADER_SIZE);
        if (slice instanceof Promise) slice = await slice;
        if (!slice) break;
        const elementStartPos = currentPos;
        const elementHeader = readElementHeader(slice);
        if (!elementHeader || !LEVEL_1_EBML_IDS.includes(elementHeader.id) && elementHeader.id !== 236 /* Void */) {
          const nextPos = await resync(
            demuxer.reader,
            elementStartPos,
            LEVEL_1_EBML_IDS,
            Math.min(segment.elementEndPos ?? Infinity, elementStartPos + MAX_RESYNC_LENGTH)
          );
          if (nextPos) {
            currentPos = nextPos;
            continue;
          } else {
            break;
          }
        }
        const id = elementHeader.id;
        let size = elementHeader.size;
        const dataStartPos = slice.filePos;
        if (id === 524531317 /* Cluster */) {
          currentCluster = await demuxer.readCluster(elementStartPos, segment);
          size = currentCluster.elementEndPos - dataStartPos;
          const { blockIndex, correctBlockFound } = getMatchInCluster(currentCluster);
          if (correctBlockFound) {
            return this.fetchPacketInCluster(currentCluster, blockIndex, options);
          }
          if (blockIndex !== -1) {
            bestCluster = currentCluster;
            bestBlockIndex = blockIndex;
          }
        }
        if (size === void 0) {
          assert(id !== 524531317 /* Cluster */);
          const nextElementPos = await searchForNextElementId(
            demuxer.reader,
            dataStartPos,
            LEVEL_0_AND_1_EBML_IDS,
            segment.elementEndPos
          );
          size = nextElementPos.pos - dataStartPos;
        }
        const endPos = dataStartPos + size;
        if (segment.elementEndPos === null) {
          let slice2 = demuxer.reader.requestSliceRange(endPos, MIN_HEADER_SIZE, MAX_HEADER_SIZE);
          if (slice2 instanceof Promise) slice2 = await slice2;
          if (!slice2) break;
          const elementId = readElementId(slice2);
          if (elementId === 408125543 /* Segment */) {
            segment.elementEndPos = endPos;
            break;
          }
        }
        currentPos = endPos;
      }
      if (cuePoint && (!bestCluster || bestCluster.elementStartPos < cuePoint.clusterPosition)) {
        const previousCuePoint = this.internalTrack.cuePoints[cuePointIndex - 1];
        assert(!previousCuePoint || previousCuePoint.time < cuePoint.time);
        const newSearchTimestamp = previousCuePoint?.time ?? -Infinity;
        return this.performClusterLookup(null, getMatchInCluster, newSearchTimestamp, latestTimestamp, options);
      }
      if (bestCluster) {
        return this.fetchPacketInCluster(bestCluster, bestBlockIndex, options);
      }
      return null;
    }
  };
  var MatroskaVideoTrackBacking = class extends MatroskaTrackBacking {
    constructor(internalTrack) {
      super(internalTrack);
      this.decoderConfigPromise = null;
      this.internalTrack = internalTrack;
    }
    getType() {
      return "video";
    }
    getCodec() {
      return this.internalTrack.info.codec;
    }
    getCodedWidth() {
      return this.internalTrack.info.width;
    }
    getCodedHeight() {
      return this.internalTrack.info.height;
    }
    getSquarePixelWidth() {
      return this.internalTrack.info.squarePixelWidth;
    }
    getSquarePixelHeight() {
      return this.internalTrack.info.squarePixelHeight;
    }
    getRotation() {
      return this.internalTrack.info.rotation;
    }
    async getColorSpace() {
      return {
        primaries: this.internalTrack.info.colorSpace?.primaries,
        transfer: this.internalTrack.info.colorSpace?.transfer,
        matrix: this.internalTrack.info.colorSpace?.matrix,
        fullRange: this.internalTrack.info.colorSpace?.fullRange
      };
    }
    async canBeTransparent() {
      return this.internalTrack.info.alphaMode || this.internalTrack.info.codec === "prores" && (this.internalTrack.info.proresFormat === "ap4h" || this.internalTrack.info.proresFormat === "ap4x");
    }
    async getDecoderConfig() {
      if (!this.internalTrack.info.codec) {
        return null;
      }
      return this.decoderConfigPromise ??= (async () => {
        let firstPacket = null;
        const needsPacketForAdditionalInfo = this.internalTrack.info.codec === "vp9" || this.internalTrack.info.codec === "av1" || this.internalTrack.info.codec === "avc" && !this.internalTrack.info.codecDescription || this.internalTrack.info.codec === "hevc" && !this.internalTrack.info.codecDescription;
        if (needsPacketForAdditionalInfo) {
          firstPacket = await this.getFirstPacket({});
        }
        const config = {
          codec: extractVideoCodecString({
            width: this.internalTrack.info.width,
            height: this.internalTrack.info.height,
            codec: this.internalTrack.info.codec,
            codecDescription: this.internalTrack.info.codecDescription,
            colorSpace: this.internalTrack.info.colorSpace,
            avcType: 1,
            // We don't know better (or do we?) so just assume 'avc1'
            avcCodecInfo: this.internalTrack.info.codec === "avc" && firstPacket ? extractAvcDecoderConfigurationRecord(firstPacket.data) : null,
            hevcCodecInfo: this.internalTrack.info.codec === "hevc" && firstPacket ? extractHevcDecoderConfigurationRecord(firstPacket.data) : null,
            vp9CodecInfo: this.internalTrack.info.codec === "vp9" && firstPacket ? extractVp9CodecInfoFromPacket(firstPacket.data) : null,
            av1CodecInfo: this.internalTrack.info.codec === "av1" && firstPacket ? extractAv1CodecInfoFromPacket(firstPacket.data) : null,
            proresFormat: this.internalTrack.info.proresFormat
          }),
          codedWidth: this.internalTrack.info.width,
          codedHeight: this.internalTrack.info.height,
          description: this.internalTrack.info.codecDescription ?? void 0,
          colorSpace: this.internalTrack.info.colorSpace ?? void 0
        };
        if (this.internalTrack.info.width !== this.internalTrack.info.squarePixelWidth || this.internalTrack.info.height !== this.internalTrack.info.squarePixelHeight) {
          config.displayAspectWidth = this.internalTrack.info.squarePixelWidth;
          config.displayAspectHeight = this.internalTrack.info.squarePixelHeight;
        }
        return config;
      })();
    }
  };
  var MatroskaAudioTrackBacking = class extends MatroskaTrackBacking {
    constructor(internalTrack) {
      super(internalTrack);
      this.decoderConfig = null;
      this.internalTrack = internalTrack;
    }
    getType() {
      return "audio";
    }
    getCodec() {
      return this.internalTrack.info.codec;
    }
    getNumberOfChannels() {
      return this.internalTrack.info.numberOfChannels;
    }
    getSampleRate() {
      return this.internalTrack.info.sampleRate;
    }
    async getDecoderConfig() {
      if (!this.internalTrack.info.codec) {
        return null;
      }
      return this.decoderConfig ??= {
        codec: extractAudioCodecString({
          codec: this.internalTrack.info.codec,
          codecDescription: this.internalTrack.info.codecDescription,
          aacCodecInfo: this.internalTrack.info.aacCodecInfo
        }),
        numberOfChannels: this.internalTrack.info.numberOfChannels,
        sampleRate: this.internalTrack.info.sampleRate,
        description: this.internalTrack.info.codecDescription ?? void 0
      };
    }
  };

  // src/mp3/mp3-reader.ts
  var readNextMp3FrameHeader = async (reader, startPos, until, ref = null) => {
    const CHUNK_SIZE = 2 ** 16;
    let currentPos = startPos;
    while (until === null || currentPos < until) {
      const maxLength = until !== null ? Math.min(CHUNK_SIZE, until - currentPos) : CHUNK_SIZE;
      let slice = reader.requestSliceRange(currentPos, MP3_FRAME_HEADER_SIZE, maxLength);
      if (slice instanceof Promise) slice = await slice;
      if (!slice || slice.length < MP3_FRAME_HEADER_SIZE) break;
      while (slice.remainingLength >= MP3_FRAME_HEADER_SIZE) {
        const posBeforeRead = slice.filePos;
        const word = readU32Be(slice);
        const remainingBytes = reader.fileSize !== null ? reader.fileSize - currentPos : null;
        const result = readMp3FrameHeader(word, remainingBytes);
        if (result.header && (!ref || // This condition helps us recover malformed streams
        // https://stackoverflow.com/a/20884944
        result.header.sampleRate === ref.sampleRate && result.header.mpegVersionId === ref.mpegVersionId && result.header.layer === ref.layer && getMp3ChannelCount(result.header.channel) === getMp3ChannelCount(ref.channel))) {
          return { header: result.header, startPos: currentPos };
        }
        slice.filePos = posBeforeRead + result.bytesAdvanced;
        currentPos = slice.filePos;
      }
    }
    return null;
  };

  // src/mp3/mp3-demuxer.ts
  var Mp3Demuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.metadataPromise = null;
      this.firstFrameHeader = null;
      this.firstFrameHeaderPos = null;
      this.xingFrameHeader = null;
      this.xingFrameHeaderPos = null;
      this.loadedSamples = [];
      // All samples from the start of the file to lastLoadedPos
      this.metadataTags = null;
      this.xingData = null;
      this.trackBackings = [];
      this.readingMutex = new AsyncMutex();
      this.lastSampleLoaded = false;
      this.lastLoadedPos = 0;
      this.nextTimestampInSamples = 0;
      this.reader = input._reader;
    }
    async readMetadata() {
      return this.metadataPromise ??= (async () => {
        while (!this.firstFrameHeader && !this.lastSampleLoaded) {
          await this.advanceReader();
        }
        if (!this.firstFrameHeader && this.xingFrameHeader) {
          this.firstFrameHeader = this.xingFrameHeader;
          this.firstFrameHeaderPos = this.xingFrameHeaderPos;
        }
        if (!this.firstFrameHeader) {
          throw new Error("No valid MP3 frame found.");
        }
        this.trackBackings = [new Mp3AudioTrackBacking(this)];
      })();
    }
    async advanceReader() {
      if (this.lastLoadedPos === 0) {
        while (true) {
          let slice2 = this.reader.requestSlice(this.lastLoadedPos, ID3_V2_HEADER_SIZE);
          if (slice2 instanceof Promise) slice2 = await slice2;
          if (!slice2) {
            this.lastSampleLoaded = true;
            return;
          }
          const id3V2Header = readId3V2Header(slice2);
          if (!id3V2Header) {
            break;
          }
          this.lastLoadedPos = slice2.filePos + id3V2Header.size;
        }
      }
      const result = await readNextMp3FrameHeader(
        this.reader,
        this.lastLoadedPos,
        this.reader.fileSize,
        this.firstFrameHeader
      );
      if (!result) {
        this.lastSampleLoaded = true;
        return;
      }
      const header = result.header;
      this.lastLoadedPos = result.startPos + header.totalSize - 1;
      const xingOffset = getXingOffset(header.mpegVersionId, header.channel);
      let slice = this.reader.requestSlice(result.startPos + xingOffset, 4);
      if (slice instanceof Promise) slice = await slice;
      if (slice) {
        const word = readU32Be(slice);
        const isXing = word === XING || word === INFO;
        if (isXing) {
          if (!this.xingFrameHeader) {
            this.xingFrameHeader = header;
            this.xingFrameHeaderPos = result.startPos;
          }
          if (!this.xingData) {
            let xingDataSlice = this.reader.requestSlice(result.startPos + xingOffset + 4, 12);
            if (xingDataSlice instanceof Promise) xingDataSlice = await xingDataSlice;
            if (xingDataSlice) {
              const xingData = readBytes(xingDataSlice, 12);
              const view2 = toDataView(xingData);
              const flags = view2.getUint32(0, false);
              this.xingData = {
                frameCount: flags & 1 /* FrameCount */ ? view2.getUint32(4, false) : null,
                fileSize: flags & 2 /* FileSize */ ? view2.getUint32(8, false) : null
              };
            }
          }
          return;
        }
      }
      if (!this.firstFrameHeader) {
        this.firstFrameHeader = header;
        this.firstFrameHeaderPos = result.startPos;
      }
      const sampleDuration = header.audioSamplesInFrame / this.firstFrameHeader.sampleRate;
      const sample = {
        timestamp: this.nextTimestampInSamples / this.firstFrameHeader.sampleRate,
        duration: sampleDuration,
        dataStart: result.startPos,
        dataSize: header.totalSize
      };
      this.loadedSamples.push(sample);
      this.nextTimestampInSamples += header.audioSamplesInFrame;
      return;
    }
    async getMimeType() {
      return "audio/mpeg";
    }
    async getTrackBackings() {
      await this.readMetadata();
      return this.trackBackings;
    }
    async getMetadataTags() {
      const release = await this.readingMutex.acquire();
      try {
        await this.readMetadata();
        if (this.metadataTags) {
          return this.metadataTags;
        }
        this.metadataTags = {};
        let currentPos = 0;
        let id3V2HeaderFound = false;
        while (true) {
          let headerSlice = this.reader.requestSlice(currentPos, ID3_V2_HEADER_SIZE);
          if (headerSlice instanceof Promise) headerSlice = await headerSlice;
          if (!headerSlice) break;
          const id3V2Header = readId3V2Header(headerSlice);
          if (!id3V2Header) {
            break;
          }
          id3V2HeaderFound = true;
          let contentSlice = this.reader.requestSlice(headerSlice.filePos, id3V2Header.size);
          if (contentSlice instanceof Promise) contentSlice = await contentSlice;
          if (!contentSlice) break;
          parseId3V2Tag(contentSlice, id3V2Header, this.metadataTags);
          currentPos = headerSlice.filePos + id3V2Header.size;
        }
        if (!id3V2HeaderFound && this.reader.fileSize !== null && this.reader.fileSize >= ID3_V1_TAG_SIZE) {
          let slice = this.reader.requestSlice(this.reader.fileSize - ID3_V1_TAG_SIZE, ID3_V1_TAG_SIZE);
          if (slice instanceof Promise) slice = await slice;
          assert(slice);
          const tag = readAscii(slice, 3);
          if (tag === "TAG") {
            parseId3V1Tag(slice, this.metadataTags);
          }
        }
        return this.metadataTags;
      } finally {
        release();
      }
    }
  };
  var Mp3AudioTrackBacking = class {
    constructor(demuxer) {
      this.demuxer = demuxer;
    }
    getType() {
      return "audio";
    }
    getId() {
      return 1;
    }
    getNumber() {
      return 1;
    }
    getTimeResolution() {
      assert(this.demuxer.firstFrameHeader);
      return this.demuxer.firstFrameHeader.sampleRate / this.demuxer.firstFrameHeader.audioSamplesInFrame;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      const demuxer = this.demuxer;
      assert(demuxer.firstFrameHeader !== null);
      assert(demuxer.firstFrameHeaderPos !== null);
      if (demuxer.xingData) {
        if (demuxer.xingData.frameCount !== null) {
          return demuxer.xingData.frameCount * demuxer.firstFrameHeader.audioSamplesInFrame / demuxer.firstFrameHeader.sampleRate;
        }
      } else {
        if (demuxer.reader.fileSize !== null) {
          const averageFrameSize = computeAverageMp3FrameSize(
            demuxer.firstFrameHeader.lowSamplingFrequency,
            demuxer.firstFrameHeader.layer,
            demuxer.firstFrameHeader.bitrate,
            demuxer.firstFrameHeader.sampleRate
          );
          const frameCount = (demuxer.reader.fileSize - demuxer.firstFrameHeaderPos) / averageFrameSize;
          return Math.round(frameCount) * demuxer.firstFrameHeader.audioSamplesInFrame / demuxer.firstFrameHeader.sampleRate;
        }
      }
      return null;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    getName() {
      return null;
    }
    getLanguageCode() {
      return UNDETERMINED_LANGUAGE;
    }
    getCodec() {
      return "mp3";
    }
    getInternalCodecId() {
      return null;
    }
    getNumberOfChannels() {
      assert(this.demuxer.firstFrameHeader);
      return getMp3ChannelCount(this.demuxer.firstFrameHeader.channel);
    }
    getSampleRate() {
      assert(this.demuxer.firstFrameHeader);
      return this.demuxer.firstFrameHeader.sampleRate;
    }
    getDisposition() {
      return {
        ...DEFAULT_TRACK_DISPOSITION
      };
    }
    async getDecoderConfig() {
      assert(this.demuxer.firstFrameHeader);
      return {
        codec: "mp3",
        numberOfChannels: getMp3ChannelCount(this.demuxer.firstFrameHeader.channel),
        sampleRate: this.demuxer.firstFrameHeader.sampleRate
      };
    }
    async getPacketAtIndex(sampleIndex, options) {
      if (sampleIndex === -1) {
        return null;
      }
      const rawSample = this.demuxer.loadedSamples[sampleIndex];
      if (!rawSample) {
        return null;
      }
      let data;
      if (options.metadataOnly) {
        data = PLACEHOLDER_DATA;
      } else {
        let slice = this.demuxer.reader.requestSlice(rawSample.dataStart, rawSample.dataSize);
        if (slice instanceof Promise) slice = await slice;
        if (!slice) {
          return null;
        }
        data = readBytes(slice, rawSample.dataSize);
      }
      return new EncodedPacket(
        data,
        "key",
        rawSample.timestamp,
        rawSample.duration,
        sampleIndex,
        rawSample.dataSize
      );
    }
    getFirstPacket(options) {
      return this.getPacketAtIndex(0, options);
    }
    async getNextPacket(packet, options) {
      const release = await this.demuxer.readingMutex.acquire();
      try {
        const sampleIndex = binarySearchExact(
          this.demuxer.loadedSamples,
          packet.timestamp,
          (x) => x.timestamp
        );
        if (sampleIndex === -1) {
          throw new Error("Packet was not created from this track.");
        }
        const nextIndex = sampleIndex + 1;
        while (nextIndex >= this.demuxer.loadedSamples.length && !this.demuxer.lastSampleLoaded) {
          await this.demuxer.advanceReader();
        }
        return this.getPacketAtIndex(nextIndex, options);
      } finally {
        release();
      }
    }
    async getPacket(timestamp, options) {
      const release = await this.demuxer.readingMutex.acquire();
      try {
        while (true) {
          const index = binarySearchLessOrEqual(
            this.demuxer.loadedSamples,
            timestamp,
            (x) => x.timestamp
          );
          if (index === -1 && this.demuxer.loadedSamples.length > 0) {
            return null;
          }
          if (this.demuxer.lastSampleLoaded) {
            return this.getPacketAtIndex(index, options);
          }
          if (index >= 0 && index + 1 < this.demuxer.loadedSamples.length) {
            return this.getPacketAtIndex(index, options);
          }
          await this.demuxer.advanceReader();
        }
      } finally {
        release();
      }
    }
    getKeyPacket(timestamp, options) {
      return this.getPacket(timestamp, options);
    }
    getNextKeyPacket(packet, options) {
      return this.getNextPacket(packet, options);
    }
  };

  // src/ogg/ogg-misc.ts
  var OGGS = 1399285583;
  var OGG_CRC_POLYNOMIAL = 79764919;
  var OGG_CRC_TABLE = new Uint32Array(256);
  for (let n = 0; n < 256; n++) {
    let crc = n << 24;
    for (let k = 0; k < 8; k++) {
      crc = crc & 2147483648 ? crc << 1 ^ OGG_CRC_POLYNOMIAL : crc << 1;
    }
    OGG_CRC_TABLE[n] = crc >>> 0 & 4294967295;
  }
  var computeOggPageCrc = (bytes2) => {
    const view2 = toDataView(bytes2);
    const originalChecksum = view2.getUint32(22, true);
    view2.setUint32(22, 0, true);
    let crc = 0;
    for (let i = 0; i < bytes2.length; i++) {
      const byte = bytes2[i];
      crc = (crc << 8 ^ OGG_CRC_TABLE[crc >>> 24 ^ byte]) >>> 0;
    }
    view2.setUint32(22, originalChecksum, true);
    return crc;
  };
  var extractSampleMetadata = (data, codecInfo, vorbisLastBlocksize) => {
    let durationInSamples = 0;
    let currentBlocksize = null;
    if (data.length > 0) {
      if (codecInfo.codec === "vorbis") {
        assert(codecInfo.vorbisInfo);
        const vorbisModeCount = codecInfo.vorbisInfo.modeBlockflags.length;
        const bitCount = ilog(vorbisModeCount - 1);
        const modeMask = (1 << bitCount) - 1 << 1;
        const modeNumber = (data[0] & modeMask) >> 1;
        if (modeNumber >= codecInfo.vorbisInfo.modeBlockflags.length) {
          throw new Error("Invalid mode number.");
        }
        let prevBlocksize = vorbisLastBlocksize;
        const blockflag = codecInfo.vorbisInfo.modeBlockflags[modeNumber];
        currentBlocksize = codecInfo.vorbisInfo.blocksizes[blockflag];
        if (blockflag === 1) {
          const prevMask = (modeMask | 1) + 1;
          const flag = data[0] & prevMask ? 1 : 0;
          prevBlocksize = codecInfo.vorbisInfo.blocksizes[flag];
        }
        durationInSamples = prevBlocksize !== null ? prevBlocksize + currentBlocksize >> 2 : 0;
      } else if (codecInfo.codec === "opus") {
        const toc = parseOpusTocByte(data);
        durationInSamples = toc.durationInSamples;
      }
    }
    return {
      durationInSamples,
      vorbisBlockSize: currentBlocksize
    };
  };
  var buildOggMimeType = (info) => {
    let string = "audio/ogg";
    if (info.codecStrings) {
      const uniqueCodecMimeTypes = [...new Set(info.codecStrings)];
      string += `; codecs="${uniqueCodecMimeTypes.join(", ")}"`;
    }
    return string;
  };

  // src/ogg/ogg-reader.ts
  var MIN_PAGE_HEADER_SIZE = 27;
  var MAX_PAGE_HEADER_SIZE = 27 + 255;
  var MAX_PAGE_SIZE = MAX_PAGE_HEADER_SIZE + 255 * 255;
  var readPageHeader = (slice) => {
    const startPos = slice.filePos;
    const capturePattern = readU32Le(slice);
    if (capturePattern !== OGGS) {
      return null;
    }
    slice.skip(1);
    const headerType = readU8(slice);
    const granulePosition = readI64Le(slice);
    const serialNumber = readU32Le(slice);
    const sequenceNumber = readU32Le(slice);
    const checksum = readU32Le(slice);
    const numberPageSegments = readU8(slice);
    const lacingValues = new Uint8Array(numberPageSegments);
    for (let i = 0; i < numberPageSegments; i++) {
      lacingValues[i] = readU8(slice);
    }
    const headerSize = 27 + numberPageSegments;
    const dataSize = lacingValues.reduce((a, b) => a + b, 0);
    const totalSize = headerSize + dataSize;
    return {
      headerStartPos: startPos,
      totalSize,
      dataStartPos: startPos + headerSize,
      dataSize,
      headerType,
      granulePosition,
      serialNumber,
      sequenceNumber,
      checksum,
      lacingValues
    };
  };
  var findNextPageHeader = (slice, until) => {
    while (slice.filePos < until - (4 - 1)) {
      const word = readU32Le(slice);
      const firstByte = word & 255;
      const secondByte = word >>> 8 & 255;
      const thirdByte = word >>> 16 & 255;
      const fourthByte = word >>> 24 & 255;
      const O = 79;
      if (firstByte !== O && secondByte !== O && thirdByte !== O && fourthByte !== O) {
        continue;
      }
      slice.skip(-4);
      if (word === OGGS) {
        return true;
      }
      slice.skip(1);
    }
    return false;
  };

  // src/ogg/ogg-demuxer.ts
  var OggDemuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.metadataPromise = null;
      this.bitstreams = [];
      this.trackBackings = [];
      this.metadataTags = {};
      this.reader = input._reader;
    }
    async readMetadata() {
      return this.metadataPromise ??= (async () => {
        let currentPos = 0;
        while (true) {
          let slice = this.reader.requestSliceRange(currentPos, MIN_PAGE_HEADER_SIZE, MAX_PAGE_HEADER_SIZE);
          if (slice instanceof Promise) slice = await slice;
          if (!slice) break;
          const page = readPageHeader(slice);
          if (!page) {
            break;
          }
          const isBos = !!(page.headerType & 2);
          if (!isBos) {
            break;
          }
          this.bitstreams.push({
            serialNumber: page.serialNumber,
            bosPage: page,
            description: null,
            numberOfChannels: -1,
            sampleRate: -1,
            codecInfo: {
              codec: null,
              vorbisInfo: null,
              opusInfo: null
            },
            lastMetadataPacket: null
          });
          currentPos = page.headerStartPos + page.totalSize;
        }
        for (const bitstream of this.bitstreams) {
          const firstPacket = await this.readPacket(bitstream.bosPage, 0);
          if (!firstPacket) {
            continue;
          }
          if (
            // Check for Vorbis
            firstPacket.data.byteLength >= 7 && firstPacket.data[0] === 1 && firstPacket.data[1] === 118 && firstPacket.data[2] === 111 && firstPacket.data[3] === 114 && firstPacket.data[4] === 98 && firstPacket.data[5] === 105 && firstPacket.data[6] === 115
          ) {
            await this.readVorbisMetadata(firstPacket, bitstream);
          } else if (
            // Check for Opus
            firstPacket.data.byteLength >= 8 && firstPacket.data[0] === 79 && firstPacket.data[1] === 112 && firstPacket.data[2] === 117 && firstPacket.data[3] === 115 && firstPacket.data[4] === 72 && firstPacket.data[5] === 101 && firstPacket.data[6] === 97 && firstPacket.data[7] === 100
          ) {
            await this.readOpusMetadata(firstPacket, bitstream);
          }
          if (bitstream.codecInfo.codec !== null) {
            this.trackBackings.push(new OggAudioTrackBacking(bitstream, this));
          }
        }
      })();
    }
    async readVorbisMetadata(firstPacket, bitstream) {
      let nextPacketPosition = await this.findNextPacketStart(firstPacket);
      if (!nextPacketPosition) {
        return;
      }
      const secondPacket = await this.readPacket(nextPacketPosition.startPage, nextPacketPosition.startSegmentIndex);
      if (!secondPacket) {
        return;
      }
      nextPacketPosition = await this.findNextPacketStart(secondPacket);
      if (!nextPacketPosition) {
        return;
      }
      const thirdPacket = await this.readPacket(nextPacketPosition.startPage, nextPacketPosition.startSegmentIndex);
      if (!thirdPacket) {
        return;
      }
      if (secondPacket.data[0] !== 3 || thirdPacket.data[0] !== 5) {
        return;
      }
      const lacingValues = [];
      const addBytesToSegmentTable = (bytes2) => {
        while (true) {
          lacingValues.push(Math.min(255, bytes2));
          if (bytes2 < 255) {
            break;
          }
          bytes2 -= 255;
        }
      };
      addBytesToSegmentTable(firstPacket.data.length);
      addBytesToSegmentTable(secondPacket.data.length);
      const description = new Uint8Array(
        1 + lacingValues.length + firstPacket.data.length + secondPacket.data.length + thirdPacket.data.length
      );
      description[0] = 2;
      description.set(
        lacingValues,
        1
      );
      description.set(
        firstPacket.data,
        1 + lacingValues.length
      );
      description.set(
        secondPacket.data,
        1 + lacingValues.length + firstPacket.data.length
      );
      description.set(
        thirdPacket.data,
        1 + lacingValues.length + firstPacket.data.length + secondPacket.data.length
      );
      bitstream.codecInfo.codec = "vorbis";
      bitstream.description = description;
      bitstream.lastMetadataPacket = thirdPacket;
      const view2 = toDataView(firstPacket.data);
      bitstream.numberOfChannels = view2.getUint8(11);
      bitstream.sampleRate = view2.getUint32(12, true);
      const blockSizeByte = view2.getUint8(28);
      bitstream.codecInfo.vorbisInfo = {
        blocksizes: [
          1 << (blockSizeByte & 15),
          1 << (blockSizeByte >> 4)
        ],
        modeBlockflags: parseModesFromVorbisSetupPacket(thirdPacket.data).modeBlockflags
      };
      readVorbisComments(secondPacket.data.subarray(7), this.metadataTags);
    }
    async readOpusMetadata(firstPacket, bitstream) {
      const nextPacketPosition = await this.findNextPacketStart(firstPacket);
      if (!nextPacketPosition) {
        return;
      }
      const secondPacket = await this.readPacket(
        nextPacketPosition.startPage,
        nextPacketPosition.startSegmentIndex
      );
      if (!secondPacket) {
        return;
      }
      bitstream.codecInfo.codec = "opus";
      bitstream.description = firstPacket.data;
      bitstream.lastMetadataPacket = secondPacket;
      const header = parseOpusIdentificationHeader(firstPacket.data);
      bitstream.numberOfChannels = header.outputChannelCount;
      bitstream.sampleRate = OPUS_SAMPLE_RATE;
      bitstream.codecInfo.opusInfo = {
        preSkip: header.preSkip
      };
      readVorbisComments(secondPacket.data.subarray(8), this.metadataTags);
    }
    async readPacket(startPage, startSegmentIndex) {
      assert(startSegmentIndex < startPage.lacingValues.length);
      let startDataOffset = 0;
      for (let i = 0; i < startSegmentIndex; i++) {
        startDataOffset += startPage.lacingValues[i];
      }
      let currentPage = startPage;
      let currentDataOffset = startDataOffset;
      let currentSegmentIndex = startSegmentIndex;
      const chunks = [];
      outer:
        while (true) {
          let pageSlice = this.reader.requestSlice(currentPage.dataStartPos, currentPage.dataSize);
          if (pageSlice instanceof Promise) pageSlice = await pageSlice;
          assert(pageSlice);
          const pageData = readBytes(pageSlice, currentPage.dataSize);
          while (true) {
            if (currentSegmentIndex === currentPage.lacingValues.length) {
              chunks.push(pageData.subarray(startDataOffset, currentDataOffset));
              break;
            }
            const lacingValue = currentPage.lacingValues[currentSegmentIndex];
            currentDataOffset += lacingValue;
            if (lacingValue < 255) {
              chunks.push(pageData.subarray(startDataOffset, currentDataOffset));
              break outer;
            }
            currentSegmentIndex++;
          }
          let currentPos = currentPage.headerStartPos + currentPage.totalSize;
          while (true) {
            let headerSlice = this.reader.requestSliceRange(currentPos, MIN_PAGE_HEADER_SIZE, MAX_PAGE_HEADER_SIZE);
            if (headerSlice instanceof Promise) headerSlice = await headerSlice;
            if (!headerSlice) {
              return null;
            }
            const nextPage = readPageHeader(headerSlice);
            if (!nextPage) {
              return null;
            }
            currentPage = nextPage;
            if (currentPage.serialNumber === startPage.serialNumber) {
              break;
            }
            currentPos = currentPage.headerStartPos + currentPage.totalSize;
          }
          startDataOffset = 0;
          currentDataOffset = 0;
          currentSegmentIndex = 0;
        }
      const totalPacketSize = chunks.reduce((sum, chunk) => sum + chunk.length, 0);
      if (totalPacketSize === 0) {
        return null;
      }
      const packetData = new Uint8Array(totalPacketSize);
      let offset = 0;
      for (let i = 0; i < chunks.length; i++) {
        const chunk = chunks[i];
        packetData.set(chunk, offset);
        offset += chunk.length;
      }
      return {
        data: packetData,
        endPage: currentPage,
        endSegmentIndex: currentSegmentIndex
      };
    }
    async findNextPacketStart(lastPacket) {
      if (lastPacket.endSegmentIndex < lastPacket.endPage.lacingValues.length - 1) {
        return { startPage: lastPacket.endPage, startSegmentIndex: lastPacket.endSegmentIndex + 1 };
      }
      const isEos = !!(lastPacket.endPage.headerType & 4);
      if (isEos) {
        return null;
      }
      let currentPos = lastPacket.endPage.headerStartPos + lastPacket.endPage.totalSize;
      while (true) {
        let slice = this.reader.requestSliceRange(currentPos, MIN_PAGE_HEADER_SIZE, MAX_PAGE_HEADER_SIZE);
        if (slice instanceof Promise) slice = await slice;
        if (!slice) {
          return null;
        }
        const nextPage = readPageHeader(slice);
        if (!nextPage) {
          return null;
        }
        if (nextPage.serialNumber === lastPacket.endPage.serialNumber) {
          return { startPage: nextPage, startSegmentIndex: 0 };
        }
        currentPos = nextPage.headerStartPos + nextPage.totalSize;
      }
    }
    async getMimeType() {
      await this.readMetadata();
      const codecStrings = await Promise.all(this.trackBackings.map(
        (x) => x.getDecoderConfig().then((c) => c?.codec ?? null)
      ));
      return buildOggMimeType({
        codecStrings: codecStrings.filter(Boolean)
      });
    }
    async getTrackBackings() {
      await this.readMetadata();
      return this.trackBackings;
    }
    async getMetadataTags() {
      await this.readMetadata();
      return this.metadataTags;
    }
  };
  var OggAudioTrackBacking = class {
    constructor(bitstream, demuxer) {
      this.bitstream = bitstream;
      this.demuxer = demuxer;
      this.encodedPacketToMetadata = /* @__PURE__ */ new WeakMap();
      this.sequentialScanCache = [];
      this.sequentialScanMutex = new AsyncMutex();
      this.internalSampleRate = bitstream.codecInfo.codec === "opus" ? OPUS_SAMPLE_RATE : bitstream.sampleRate;
    }
    getType() {
      return "audio";
    }
    getId() {
      return this.bitstream.serialNumber;
    }
    getNumber() {
      const index = this.demuxer.trackBackings.findIndex(
        (x) => x.bitstream === this.bitstream
      );
      assert(index !== -1);
      return index + 1;
    }
    getNumberOfChannels() {
      return this.bitstream.numberOfChannels;
    }
    getSampleRate() {
      return this.bitstream.sampleRate;
    }
    getTimeResolution() {
      return this.bitstream.sampleRate;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      return null;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    getCodec() {
      return this.bitstream.codecInfo.codec;
    }
    getInternalCodecId() {
      return null;
    }
    async getDecoderConfig() {
      assert(this.bitstream.codecInfo.codec);
      return {
        codec: this.bitstream.codecInfo.codec,
        numberOfChannels: this.bitstream.numberOfChannels,
        sampleRate: this.bitstream.sampleRate,
        description: this.bitstream.description ?? void 0
      };
    }
    getName() {
      return null;
    }
    getLanguageCode() {
      return UNDETERMINED_LANGUAGE;
    }
    getDisposition() {
      return {
        ...DEFAULT_TRACK_DISPOSITION,
        primary: false
      };
    }
    granulePositionToTimestampInSamples(granulePosition) {
      if (this.bitstream.codecInfo.codec === "opus") {
        assert(this.bitstream.codecInfo.opusInfo);
        return granulePosition - this.bitstream.codecInfo.opusInfo.preSkip;
      }
      return granulePosition;
    }
    createEncodedPacketFromOggPacket(packet, additional, options) {
      if (!packet) {
        return null;
      }
      const { durationInSamples, vorbisBlockSize } = extractSampleMetadata(
        packet.data,
        this.bitstream.codecInfo,
        additional.vorbisLastBlocksize
      );
      const encodedPacket = new EncodedPacket(
        options.metadataOnly ? PLACEHOLDER_DATA : packet.data,
        "key",
        Math.max(0, additional.timestampInSamples) / this.internalSampleRate,
        durationInSamples / this.internalSampleRate,
        packet.endPage.headerStartPos + packet.endSegmentIndex,
        packet.data.byteLength
      );
      this.encodedPacketToMetadata.set(encodedPacket, {
        packet,
        timestampInSamples: additional.timestampInSamples,
        durationInSamples,
        vorbisLastBlockSize: additional.vorbisLastBlocksize,
        vorbisBlockSize
      });
      return encodedPacket;
    }
    async getFirstPacket(options) {
      assert(this.bitstream.lastMetadataPacket);
      const packetPosition = await this.demuxer.findNextPacketStart(this.bitstream.lastMetadataPacket);
      if (!packetPosition) {
        return null;
      }
      let timestampInSamples = 0;
      if (this.bitstream.codecInfo.codec === "opus") {
        assert(this.bitstream.codecInfo.opusInfo);
        timestampInSamples -= this.bitstream.codecInfo.opusInfo.preSkip;
      }
      const packet = await this.demuxer.readPacket(packetPosition.startPage, packetPosition.startSegmentIndex);
      return this.createEncodedPacketFromOggPacket(
        packet,
        {
          timestampInSamples,
          vorbisLastBlocksize: null
        },
        options
      );
    }
    async getNextPacket(prevPacket, options) {
      const prevMetadata = this.encodedPacketToMetadata.get(prevPacket);
      if (!prevMetadata) {
        throw new Error("Packet was not created from this track.");
      }
      const packetPosition = await this.demuxer.findNextPacketStart(prevMetadata.packet);
      if (!packetPosition) {
        return null;
      }
      const timestampInSamples = prevMetadata.timestampInSamples + prevMetadata.durationInSamples;
      const packet = await this.demuxer.readPacket(
        packetPosition.startPage,
        packetPosition.startSegmentIndex
      );
      return this.createEncodedPacketFromOggPacket(
        packet,
        {
          timestampInSamples,
          vorbisLastBlocksize: prevMetadata.vorbisBlockSize
        },
        options
      );
    }
    async getPacket(timestamp, options) {
      if (this.demuxer.reader.fileSize === null) {
        return this.getPacketSequential(timestamp, options);
      }
      const timestampInSamples = roundIfAlmostInteger(timestamp * this.internalSampleRate);
      if (timestampInSamples === 0) {
        return this.getFirstPacket(options);
      }
      if (timestampInSamples < 0) {
        return null;
      }
      assert(this.bitstream.lastMetadataPacket);
      const startPosition = await this.demuxer.findNextPacketStart(this.bitstream.lastMetadataPacket);
      if (!startPosition) {
        return null;
      }
      let lowPage = startPosition.startPage;
      let high = this.demuxer.reader.fileSize;
      const lowPages = [lowPage];
      outer:
        while (lowPage.headerStartPos + lowPage.totalSize < high) {
          const low = lowPage.headerStartPos;
          const mid = Math.floor((low + high) / 2);
          let searchStartPos = mid;
          while (true) {
            const until = Math.min(
              searchStartPos + MAX_PAGE_SIZE,
              high - MIN_PAGE_HEADER_SIZE
            );
            let searchSlice = this.demuxer.reader.requestSlice(searchStartPos, until - searchStartPos);
            if (searchSlice instanceof Promise) searchSlice = await searchSlice;
            assert(searchSlice);
            const found = findNextPageHeader(searchSlice, until);
            if (!found) {
              high = mid + MIN_PAGE_HEADER_SIZE;
              continue outer;
            }
            let headerSlice = this.demuxer.reader.requestSliceRange(
              searchSlice.filePos,
              MIN_PAGE_HEADER_SIZE,
              MAX_PAGE_HEADER_SIZE
            );
            if (headerSlice instanceof Promise) headerSlice = await headerSlice;
            assert(headerSlice);
            const page = readPageHeader(headerSlice);
            assert(page);
            let pageValid = false;
            if (page.serialNumber === this.bitstream.serialNumber) {
              pageValid = true;
            } else {
              let pageSlice = this.demuxer.reader.requestSlice(page.headerStartPos, page.totalSize);
              if (pageSlice instanceof Promise) pageSlice = await pageSlice;
              assert(pageSlice);
              const bytes2 = readBytes(pageSlice, page.totalSize);
              const crc = computeOggPageCrc(bytes2);
              pageValid = crc === page.checksum;
            }
            if (!pageValid) {
              searchStartPos = page.headerStartPos + 4;
              continue;
            }
            if (pageValid && page.serialNumber !== this.bitstream.serialNumber) {
              searchStartPos = page.headerStartPos + page.totalSize;
              continue;
            }
            const isContinuationPage = page.granulePosition === -1;
            if (isContinuationPage) {
              searchStartPos = page.headerStartPos + page.totalSize;
              continue;
            }
            if (this.granulePositionToTimestampInSamples(page.granulePosition) > timestampInSamples) {
              high = page.headerStartPos;
            } else {
              lowPage = page;
              lowPages.push(page);
            }
            continue outer;
          }
        }
      let lowerPage = startPosition.startPage;
      for (const otherLowPage of lowPages) {
        if (otherLowPage.granulePosition === lowPage.granulePosition) {
          break;
        }
        if (!lowerPage || otherLowPage.headerStartPos > lowerPage.headerStartPos) {
          lowerPage = otherLowPage;
        }
      }
      let currentPage = lowerPage;
      const previousPages = [currentPage];
      while (true) {
        if (currentPage.serialNumber === this.bitstream.serialNumber && currentPage.granulePosition === lowPage.granulePosition) {
          break;
        }
        const nextPos = currentPage.headerStartPos + currentPage.totalSize;
        let slice = this.demuxer.reader.requestSliceRange(nextPos, MIN_PAGE_HEADER_SIZE, MAX_PAGE_HEADER_SIZE);
        if (slice instanceof Promise) slice = await slice;
        assert(slice);
        const nextPage = readPageHeader(slice);
        assert(nextPage);
        currentPage = nextPage;
        if (currentPage.serialNumber === this.bitstream.serialNumber) {
          previousPages.push(currentPage);
        }
      }
      assert(currentPage.granulePosition !== -1);
      let currentSegmentIndex = null;
      let currentTimestampInSamples;
      let currentTimestampIsCorrect;
      let endPage = currentPage;
      let endSegmentIndex = 0;
      if (currentPage.headerStartPos === startPosition.startPage.headerStartPos) {
        currentTimestampInSamples = this.granulePositionToTimestampInSamples(0);
        currentTimestampIsCorrect = true;
        currentSegmentIndex = 0;
      } else {
        currentTimestampInSamples = 0;
        currentTimestampIsCorrect = false;
        for (let i = currentPage.lacingValues.length - 1; i >= 0; i--) {
          const value = currentPage.lacingValues[i];
          if (value < 255) {
            currentSegmentIndex = i + 1;
            break;
          }
        }
        if (currentSegmentIndex === null) {
          throw new Error("Invalid page with granule position: no packets end on this page.");
        }
        endSegmentIndex = currentSegmentIndex - 1;
        const pseudopacket = {
          data: PLACEHOLDER_DATA,
          endPage,
          endSegmentIndex
        };
        const nextPosition = await this.demuxer.findNextPacketStart(pseudopacket);
        if (nextPosition) {
          const endPosition = findPreviousPacketEndPosition(previousPages, currentPage, currentSegmentIndex);
          assert(endPosition);
          const startPosition2 = findPacketStartPosition(
            previousPages,
            endPosition.page,
            endPosition.segmentIndex
          );
          if (startPosition2) {
            currentPage = startPosition2.page;
            currentSegmentIndex = startPosition2.segmentIndex;
          }
        } else {
          while (true) {
            const endPosition = findPreviousPacketEndPosition(
              previousPages,
              currentPage,
              currentSegmentIndex
            );
            if (!endPosition) {
              break;
            }
            const startPosition2 = findPacketStartPosition(
              previousPages,
              endPosition.page,
              endPosition.segmentIndex
            );
            if (!startPosition2) {
              break;
            }
            currentPage = startPosition2.page;
            currentSegmentIndex = startPosition2.segmentIndex;
            if (endPosition.page.headerStartPos !== endPage.headerStartPos) {
              endPage = endPosition.page;
              endSegmentIndex = endPosition.segmentIndex;
              break;
            }
          }
        }
      }
      let lastEncodedPacket = null;
      let lastEncodedPacketMetadata = null;
      while (currentPage !== null) {
        assert(currentSegmentIndex !== null);
        const packet = await this.demuxer.readPacket(currentPage, currentSegmentIndex);
        if (!packet) {
          break;
        }
        const skipPacket = currentPage.headerStartPos === startPosition.startPage.headerStartPos && currentSegmentIndex < startPosition.startSegmentIndex;
        if (!skipPacket) {
          let encodedPacket = this.createEncodedPacketFromOggPacket(
            packet,
            {
              timestampInSamples: currentTimestampInSamples,
              vorbisLastBlocksize: lastEncodedPacketMetadata?.vorbisBlockSize ?? null
            },
            options
          );
          assert(encodedPacket);
          let encodedPacketMetadata = this.encodedPacketToMetadata.get(encodedPacket);
          assert(encodedPacketMetadata);
          if (!currentTimestampIsCorrect && packet.endPage.headerStartPos === endPage.headerStartPos && packet.endSegmentIndex === endSegmentIndex) {
            currentTimestampInSamples = this.granulePositionToTimestampInSamples(
              currentPage.granulePosition
            );
            currentTimestampIsCorrect = true;
            encodedPacket = this.createEncodedPacketFromOggPacket(
              packet,
              {
                timestampInSamples: currentTimestampInSamples - encodedPacketMetadata.durationInSamples,
                vorbisLastBlocksize: lastEncodedPacketMetadata?.vorbisBlockSize ?? null
              },
              options
            );
            assert(encodedPacket);
            encodedPacketMetadata = this.encodedPacketToMetadata.get(encodedPacket);
            assert(encodedPacketMetadata);
          } else {
            currentTimestampInSamples += encodedPacketMetadata.durationInSamples;
          }
          lastEncodedPacket = encodedPacket;
          lastEncodedPacketMetadata = encodedPacketMetadata;
          if (currentTimestampIsCorrect && // Next timestamp will be too late
          (Math.max(currentTimestampInSamples, 0) > timestampInSamples || Math.max(encodedPacketMetadata.timestampInSamples, 0) === timestampInSamples)) {
            break;
          }
        }
        const nextPosition = await this.demuxer.findNextPacketStart(packet);
        if (!nextPosition) {
          break;
        }
        currentPage = nextPosition.startPage;
        currentSegmentIndex = nextPosition.startSegmentIndex;
      }
      return lastEncodedPacket;
    }
    // A slower but simpler and sequential algorithm for finding a packet in a file
    async getPacketSequential(timestamp, options) {
      const release = await this.sequentialScanMutex.acquire();
      try {
        const timestampInSamples = roundIfAlmostInteger(timestamp * this.internalSampleRate);
        timestamp = timestampInSamples / this.internalSampleRate;
        const index = binarySearchLessOrEqual(
          this.sequentialScanCache,
          timestampInSamples,
          (x) => x.timestampInSamples
        );
        let currentPacket;
        if (index !== -1) {
          const cacheEntry = this.sequentialScanCache[index];
          currentPacket = this.createEncodedPacketFromOggPacket(
            cacheEntry.packet,
            {
              timestampInSamples: cacheEntry.timestampInSamples,
              vorbisLastBlocksize: cacheEntry.vorbisLastBlockSize
            },
            options
          );
        } else {
          currentPacket = await this.getFirstPacket(options);
        }
        let i = 0;
        while (currentPacket && currentPacket.timestamp < timestamp) {
          const nextPacket = await this.getNextPacket(currentPacket, options);
          if (!nextPacket || nextPacket.timestamp > timestamp) {
            break;
          }
          currentPacket = nextPacket;
          i++;
          if (i === 100) {
            i = 0;
            const metadata = this.encodedPacketToMetadata.get(currentPacket);
            assert(metadata);
            if (this.sequentialScanCache.length > 0) {
              assert(last(this.sequentialScanCache).timestampInSamples <= metadata.timestampInSamples);
            }
            this.sequentialScanCache.push(metadata);
          }
        }
        return currentPacket;
      } finally {
        release();
      }
    }
    getKeyPacket(timestamp, options) {
      return this.getPacket(timestamp, options);
    }
    getNextKeyPacket(packet, options) {
      return this.getNextPacket(packet, options);
    }
  };
  var findPacketStartPosition = (pageList, endPage, endSegmentIndex) => {
    let page = endPage;
    let segmentIndex = endSegmentIndex;
    outer:
      while (true) {
        segmentIndex--;
        for (segmentIndex; segmentIndex >= 0; segmentIndex--) {
          const lacingValue = page.lacingValues[segmentIndex];
          if (lacingValue < 255) {
            segmentIndex++;
            break outer;
          }
        }
        assert(segmentIndex === -1);
        const pageStartsWithFreshPacket = !(page.headerType & 1);
        if (pageStartsWithFreshPacket) {
          segmentIndex = 0;
          break;
        }
        const previousPage = findLast(
          pageList,
          (x) => x.headerStartPos < page.headerStartPos
        );
        if (!previousPage) {
          return null;
        }
        page = previousPage;
        segmentIndex = page.lacingValues.length;
      }
    assert(segmentIndex !== -1);
    if (segmentIndex === page.lacingValues.length) {
      const nextPage = pageList[pageList.indexOf(page) + 1];
      assert(nextPage);
      page = nextPage;
      segmentIndex = 0;
    }
    return { page, segmentIndex };
  };
  var findPreviousPacketEndPosition = (pageList, startPage, startSegmentIndex) => {
    if (startSegmentIndex > 0) {
      return { page: startPage, segmentIndex: startSegmentIndex - 1 };
    }
    const previousPage = findLast(
      pageList,
      (x) => x.headerStartPos < startPage.headerStartPos
    );
    if (!previousPage) {
      return null;
    }
    return { page: previousPage, segmentIndex: previousPage.lacingValues.length - 1 };
  };

  // src/wave/wave-demuxer.ts
  var WaveDemuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.metadataPromise = null;
      this.dataStart = -1;
      this.dataSize = -1;
      this.audioInfo = null;
      this.trackBackings = [];
      this.lastKnownPacketIndex = 0;
      this.metadataTags = {};
      this.reader = input._reader;
    }
    async readMetadata() {
      return this.metadataPromise ??= (async () => {
        let slice = this.reader.requestSlice(0, 12);
        if (slice instanceof Promise) slice = await slice;
        assert(slice);
        const riffType = readAscii(slice, 4);
        const littleEndian = riffType !== "RIFX";
        const isRf64 = riffType === "RF64";
        const outerChunkSize = readU32(slice, littleEndian);
        let totalFileSize = isRf64 ? this.reader.fileSize : Math.min(outerChunkSize + 8, this.reader.fileSize ?? Infinity);
        const format = readAscii(slice, 4);
        if (format !== "WAVE") {
          throw new Error("Invalid WAVE file - wrong format");
        }
        let chunksRead = 0;
        let dataChunkSize = null;
        let currentPos = slice.filePos;
        while (totalFileSize === null || currentPos < totalFileSize) {
          let slice2 = this.reader.requestSlice(currentPos, 8);
          if (slice2 instanceof Promise) slice2 = await slice2;
          if (!slice2) break;
          const chunkId = readAscii(slice2, 4);
          const chunkSize = readU32(slice2, littleEndian);
          const startPos = slice2.filePos;
          if (isRf64 && chunksRead === 0 && chunkId !== "ds64") {
            throw new Error('Invalid RF64 file: First chunk must be "ds64".');
          }
          if (chunkId === "fmt ") {
            await this.parseFmtChunk(startPos, chunkSize, littleEndian);
          } else if (chunkId === "data") {
            dataChunkSize ??= chunkSize;
            this.dataStart = slice2.filePos;
            this.dataSize = Math.min(dataChunkSize, (totalFileSize ?? Infinity) - this.dataStart);
            if (this.reader.fileSize === null) {
              break;
            }
          } else if (chunkId === "ds64") {
            let ds64Slice = this.reader.requestSlice(startPos, chunkSize);
            if (ds64Slice instanceof Promise) ds64Slice = await ds64Slice;
            if (!ds64Slice) break;
            const riffChunkSize = readU64(ds64Slice, littleEndian);
            dataChunkSize = readU64(ds64Slice, littleEndian);
            totalFileSize = Math.min(riffChunkSize + 8, this.reader.fileSize ?? Infinity);
          } else if (chunkId === "LIST") {
            await this.parseListChunk(startPos, chunkSize, littleEndian);
          } else if (chunkId === "ID3 " || chunkId === "id3 ") {
            await this.parseId3Chunk(startPos, chunkSize);
          }
          currentPos = startPos + chunkSize + (chunkSize & 1);
          chunksRead++;
        }
        if (!this.audioInfo) {
          throw new Error('Invalid WAVE file - missing "fmt " chunk');
        }
        if (this.dataStart === -1) {
          throw new Error('Invalid WAVE file - missing "data" chunk');
        }
        const blockSize = this.audioInfo.blockSizeInBytes;
        this.dataSize = Math.floor(this.dataSize / blockSize) * blockSize;
        this.trackBackings.push(new WaveAudioTrackBacking(this));
      })();
    }
    async parseFmtChunk(startPos, size, littleEndian) {
      let slice = this.reader.requestSlice(startPos, size);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return;
      let formatTag = readU16(slice, littleEndian);
      const numChannels = readU16(slice, littleEndian);
      const sampleRate = readU32(slice, littleEndian);
      slice.skip(4);
      const blockAlign = readU16(slice, littleEndian);
      let bitsPerSample;
      if (size === 14) {
        bitsPerSample = 8;
      } else {
        bitsPerSample = readU16(slice, littleEndian);
      }
      if (size >= 18 && formatTag !== 357) {
        const cbSize = readU16(slice, littleEndian);
        const remainingSize = size - 18;
        const extensionSize = Math.min(remainingSize, cbSize);
        if (extensionSize >= 22 && formatTag === 65534 /* EXTENSIBLE */) {
          slice.skip(2 + 4);
          const subFormat = readBytes(slice, 16);
          formatTag = subFormat[0] | subFormat[1] << 8;
        }
      }
      if (formatTag === 7 /* MULAW */ || formatTag === 6 /* ALAW */) {
        bitsPerSample = 8;
      }
      if (formatTag !== 1 /* PCM */ && formatTag !== 3 /* IEEE_FLOAT */ && formatTag !== 6 /* ALAW */ && formatTag !== 7 /* MULAW */) {
        throw new Error(
          `Unsupported WAVE codec (format tag ${formatTag}). Only integer/float PCM, A-law, and \u03BC-law are supported.`
        );
      }
      if (formatTag === 1 /* PCM */ && ![8, 16, 24, 32].includes(bitsPerSample)) {
        throw new Error(
          `Unsupported WAVE PCM bit depth (${bitsPerSample}). Only 8, 16, 24, and 32 bits are supported.`
        );
      }
      if (formatTag === 3 /* IEEE_FLOAT */ && ![32, 64].includes(bitsPerSample)) {
        throw new Error(
          `Unsupported WAVE float bit depth (${bitsPerSample}). Only 32 and 64 bits are supported.`
        );
      }
      this.audioInfo = {
        format: formatTag,
        numberOfChannels: numChannels,
        sampleRate,
        sampleSizeInBytes: Math.ceil(bitsPerSample / 8),
        blockSizeInBytes: blockAlign
      };
    }
    async parseListChunk(startPos, size, littleEndian) {
      let slice = this.reader.requestSlice(startPos, size);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return;
      const infoType = readAscii(slice, 4);
      if (infoType !== "INFO" && infoType !== "INF0") {
        return;
      }
      let currentPos = slice.filePos;
      while (currentPos <= startPos + size - 8) {
        slice.filePos = currentPos;
        const chunkName = readAscii(slice, 4);
        const chunkSize = readU32(slice, littleEndian);
        const bytes2 = readBytes(slice, chunkSize);
        let stringLength = 0;
        for (let i = 0; i < bytes2.length; i++) {
          if (bytes2[i] === 0) {
            break;
          }
          stringLength++;
        }
        const value = String.fromCharCode(...bytes2.subarray(0, stringLength));
        this.metadataTags.raw ??= {};
        this.metadataTags.raw[chunkName] = value;
        switch (chunkName) {
          case "INAM":
          case "TITL":
            {
              this.metadataTags.title ??= value;
            }
            ;
            break;
          case "TIT3":
            {
              this.metadataTags.description ??= value;
            }
            ;
            break;
          case "IART":
            {
              this.metadataTags.artist ??= value;
            }
            ;
            break;
          case "IPRD":
            {
              this.metadataTags.album ??= value;
            }
            ;
            break;
          case "IPRT":
          case "ITRK":
          case "TRCK":
            {
              const parts = value.split("/");
              const trackNum = Number.parseInt(parts[0], 10);
              const tracksTotal = parts[1] && Number.parseInt(parts[1], 10);
              if (Number.isInteger(trackNum) && trackNum > 0) {
                this.metadataTags.trackNumber ??= trackNum;
              }
              if (tracksTotal && Number.isInteger(tracksTotal) && tracksTotal > 0) {
                this.metadataTags.tracksTotal ??= tracksTotal;
              }
            }
            ;
            break;
          case "ICRD":
          case "IDIT":
            {
              const date = new Date(value);
              if (!Number.isNaN(date.getTime())) {
                this.metadataTags.date ??= date;
              }
            }
            ;
            break;
          case "YEAR":
            {
              const year = Number.parseInt(value, 10);
              if (Number.isInteger(year) && year > 0) {
                this.metadataTags.date ??= new Date(year, 0, 1);
              }
            }
            ;
            break;
          case "IGNR":
          case "GENR":
            {
              this.metadataTags.genre ??= value;
            }
            ;
            break;
          case "ICMT":
          case "CMNT":
          case "COMM":
            {
              this.metadataTags.comment ??= value;
            }
            ;
            break;
        }
        currentPos += 8 + chunkSize + (chunkSize & 1);
      }
    }
    async parseId3Chunk(startPos, size) {
      let slice = this.reader.requestSlice(startPos, size);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return;
      const id3V2Header = readId3V2Header(slice);
      if (id3V2Header) {
        const availableSize = size - ID3_V2_HEADER_SIZE;
        id3V2Header.size = Math.min(id3V2Header.size, availableSize);
        if (id3V2Header.size > 0) {
          const contentSlice = slice.slice(startPos + ID3_V2_HEADER_SIZE, id3V2Header.size);
          parseId3V2Tag(contentSlice, id3V2Header, this.metadataTags);
        }
      }
    }
    getCodec() {
      assert(this.audioInfo);
      if (this.audioInfo.format === 7 /* MULAW */) {
        return "ulaw";
      }
      if (this.audioInfo.format === 6 /* ALAW */) {
        return "alaw";
      }
      if (this.audioInfo.format === 1 /* PCM */) {
        if (this.audioInfo.sampleSizeInBytes === 1) {
          return "pcm-u8";
        } else if (this.audioInfo.sampleSizeInBytes === 2) {
          return "pcm-s16";
        } else if (this.audioInfo.sampleSizeInBytes === 3) {
          return "pcm-s24";
        } else if (this.audioInfo.sampleSizeInBytes === 4) {
          return "pcm-s32";
        }
      }
      if (this.audioInfo.format === 3 /* IEEE_FLOAT */) {
        if (this.audioInfo.sampleSizeInBytes === 4) {
          return "pcm-f32";
        } else if (this.audioInfo.sampleSizeInBytes === 8) {
          return "pcm-f64";
        }
      }
      assert(false);
    }
    async getMimeType() {
      return "audio/wav";
    }
    async getTrackBackings() {
      await this.readMetadata();
      return this.trackBackings;
    }
    async getMetadataTags() {
      await this.readMetadata();
      return this.metadataTags;
    }
  };
  var PACKET_SIZE_IN_FRAMES = 2048;
  var WaveAudioTrackBacking = class {
    constructor(demuxer) {
      this.demuxer = demuxer;
    }
    getType() {
      return "audio";
    }
    getId() {
      return 1;
    }
    getNumber() {
      return 1;
    }
    getCodec() {
      return this.demuxer.getCodec();
    }
    getInternalCodecId() {
      assert(this.demuxer.audioInfo);
      return this.demuxer.audioInfo.format;
    }
    async getDecoderConfig() {
      const codec = this.demuxer.getCodec();
      if (!codec) {
        return null;
      }
      assert(this.demuxer.audioInfo);
      return {
        codec,
        numberOfChannels: this.demuxer.audioInfo.numberOfChannels,
        sampleRate: this.demuxer.audioInfo.sampleRate
      };
    }
    getNumberOfChannels() {
      assert(this.demuxer.audioInfo);
      return this.demuxer.audioInfo.numberOfChannels;
    }
    getSampleRate() {
      assert(this.demuxer.audioInfo);
      return this.demuxer.audioInfo.sampleRate;
    }
    getTimeResolution() {
      assert(this.demuxer.audioInfo);
      return this.demuxer.audioInfo.sampleRate;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      assert(this.demuxer.dataSize !== -1);
      return this.demuxer.dataSize / this.demuxer.audioInfo.blockSizeInBytes / this.demuxer.audioInfo.sampleRate;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    getName() {
      return null;
    }
    getLanguageCode() {
      return UNDETERMINED_LANGUAGE;
    }
    getDisposition() {
      return {
        ...DEFAULT_TRACK_DISPOSITION
      };
    }
    async getPacketAtIndex(packetIndex, options) {
      assert(packetIndex >= 0);
      assert(this.demuxer.audioInfo);
      const startOffset = packetIndex * PACKET_SIZE_IN_FRAMES * this.demuxer.audioInfo.blockSizeInBytes;
      if (startOffset >= this.demuxer.dataSize) {
        return null;
      }
      const sizeInBytes = Math.min(
        PACKET_SIZE_IN_FRAMES * this.demuxer.audioInfo.blockSizeInBytes,
        this.demuxer.dataSize - startOffset
      );
      if (this.demuxer.reader.fileSize === null) {
        let slice = this.demuxer.reader.requestSlice(this.demuxer.dataStart + startOffset, sizeInBytes);
        if (slice instanceof Promise) slice = await slice;
        if (!slice) {
          return null;
        }
      }
      let data;
      if (options.metadataOnly) {
        data = PLACEHOLDER_DATA;
      } else {
        let slice = this.demuxer.reader.requestSlice(this.demuxer.dataStart + startOffset, sizeInBytes);
        if (slice instanceof Promise) slice = await slice;
        assert(slice);
        data = readBytes(slice, sizeInBytes);
      }
      const timestamp = packetIndex * PACKET_SIZE_IN_FRAMES / this.demuxer.audioInfo.sampleRate;
      const duration = sizeInBytes / this.demuxer.audioInfo.blockSizeInBytes / this.demuxer.audioInfo.sampleRate;
      this.demuxer.lastKnownPacketIndex = Math.max(
        packetIndex,
        this.demuxer.lastKnownPacketIndex
      );
      return new EncodedPacket(
        data,
        "key",
        timestamp,
        duration,
        packetIndex,
        sizeInBytes
      );
    }
    getFirstPacket(options) {
      return this.getPacketAtIndex(0, options);
    }
    async getPacket(timestamp, options) {
      assert(this.demuxer.audioInfo);
      const packetIndex = Math.floor(Math.min(
        timestamp * this.demuxer.audioInfo.sampleRate / PACKET_SIZE_IN_FRAMES,
        (this.demuxer.dataSize - 1) / (PACKET_SIZE_IN_FRAMES * this.demuxer.audioInfo.blockSizeInBytes)
      ));
      if (packetIndex < 0) {
        return null;
      }
      const packet = await this.getPacketAtIndex(packetIndex, options);
      if (packet) {
        return packet;
      }
      if (packetIndex === 0) {
        return null;
      }
      assert(this.demuxer.reader.fileSize === null);
      let currentPacket = await this.getPacketAtIndex(this.demuxer.lastKnownPacketIndex, options);
      while (currentPacket) {
        const nextPacket = await this.getNextPacket(currentPacket, options);
        if (!nextPacket) {
          break;
        }
        currentPacket = nextPacket;
      }
      return currentPacket;
    }
    getNextPacket(packet, options) {
      assert(this.demuxer.audioInfo);
      const packetIndex = Math.round(packet.timestamp * this.demuxer.audioInfo.sampleRate / PACKET_SIZE_IN_FRAMES);
      return this.getPacketAtIndex(packetIndex + 1, options);
    }
    getKeyPacket(timestamp, options) {
      return this.getPacket(timestamp, options);
    }
    getNextKeyPacket(packet, options) {
      return this.getNextPacket(packet, options);
    }
  };

  // src/adts/adts-reader.ts
  var MIN_ADTS_FRAME_HEADER_SIZE = 7;
  var MAX_ADTS_FRAME_HEADER_SIZE = 9;
  var readAdtsFrameHeader = (slice) => {
    const startPos = slice.filePos;
    const bytes2 = readBytes(slice, 9);
    const bitstream = new Bitstream(bytes2);
    const syncword = bitstream.readBits(12);
    if (syncword !== 4095) {
      return null;
    }
    bitstream.skipBits(1);
    const layer = bitstream.readBits(2);
    if (layer !== 0) {
      return null;
    }
    const protectionAbsence = bitstream.readBits(1);
    const objectType = bitstream.readBits(2) + 1;
    const samplingFrequencyIndex = bitstream.readBits(4);
    if (samplingFrequencyIndex === 15) {
      return null;
    }
    bitstream.skipBits(1);
    const channelConfiguration = bitstream.readBits(3);
    if (channelConfiguration === 0) {
      throw new Error("ADTS frames with channel configuration 0 are not supported.");
    }
    bitstream.skipBits(1);
    bitstream.skipBits(1);
    bitstream.skipBits(1);
    bitstream.skipBits(1);
    const frameLength = bitstream.readBits(13);
    bitstream.skipBits(11);
    const numberOfAacFrames = bitstream.readBits(2) + 1;
    if (numberOfAacFrames !== 1) {
      throw new Error("ADTS frames with more than one AAC frame are not supported.");
    }
    let crcCheck = null;
    if (protectionAbsence === 1) {
      slice.filePos -= 2;
    } else {
      crcCheck = bitstream.readBits(16);
    }
    return {
      objectType,
      samplingFrequencyIndex,
      channelConfiguration,
      frameLength,
      numberOfAacFrames,
      crcCheck,
      startPos
    };
  };

  // src/adts/adts-demuxer.ts
  var SAMPLES_PER_AAC_FRAME = 1024;
  var AdtsDemuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.metadataPromise = null;
      this.firstFrameHeader = null;
      this.loadedSamples = [];
      this.metadataTags = null;
      this.trackBackings = [];
      this.readingMutex = new AsyncMutex();
      this.lastSampleLoaded = false;
      this.lastLoadedPos = 0;
      this.nextTimestampInSamples = 0;
      this.reader = input._reader;
    }
    async readMetadata() {
      return this.metadataPromise ??= (async () => {
        while (!this.firstFrameHeader && !this.lastSampleLoaded) {
          await this.advanceReader();
        }
        assert(this.firstFrameHeader);
        this.trackBackings = [new AdtsAudioTrackBacking(this)];
      })();
    }
    async advanceReader() {
      if (this.lastLoadedPos === 0) {
        while (true) {
          let slice2 = this.reader.requestSlice(this.lastLoadedPos, ID3_V2_HEADER_SIZE);
          if (slice2 instanceof Promise) slice2 = await slice2;
          if (!slice2) {
            this.lastSampleLoaded = true;
            return;
          }
          const id3V2Header = readId3V2Header(slice2);
          if (!id3V2Header) {
            break;
          }
          this.lastLoadedPos = slice2.filePos + id3V2Header.size;
        }
      }
      let slice = this.reader.requestSliceRange(
        this.lastLoadedPos,
        MIN_ADTS_FRAME_HEADER_SIZE,
        MAX_ADTS_FRAME_HEADER_SIZE
      );
      if (slice instanceof Promise) slice = await slice;
      if (!slice) {
        this.lastSampleLoaded = true;
        return;
      }
      const header = readAdtsFrameHeader(slice);
      if (!header) {
        this.lastSampleLoaded = true;
        return;
      }
      if (this.reader.fileSize !== null && header.startPos + header.frameLength > this.reader.fileSize) {
        this.lastSampleLoaded = true;
        return;
      }
      if (!this.firstFrameHeader) {
        this.firstFrameHeader = header;
      }
      const sampleRate = aacFrequencyTable[header.samplingFrequencyIndex];
      assert(sampleRate !== void 0);
      const sampleDuration = SAMPLES_PER_AAC_FRAME / sampleRate;
      const sample = {
        timestamp: this.nextTimestampInSamples / sampleRate,
        duration: sampleDuration,
        dataStart: header.startPos,
        dataSize: header.frameLength
      };
      this.loadedSamples.push(sample);
      this.nextTimestampInSamples += SAMPLES_PER_AAC_FRAME;
      this.lastLoadedPos = header.startPos + header.frameLength;
    }
    async getMimeType() {
      return "audio/aac";
    }
    async getTrackBackings() {
      await this.readMetadata();
      return this.trackBackings;
    }
    async getMetadataTags() {
      const release = await this.readingMutex.acquire();
      try {
        await this.readMetadata();
        if (this.metadataTags) {
          return this.metadataTags;
        }
        this.metadataTags = {};
        let currentPos = 0;
        while (true) {
          let headerSlice = this.reader.requestSlice(currentPos, ID3_V2_HEADER_SIZE);
          if (headerSlice instanceof Promise) headerSlice = await headerSlice;
          if (!headerSlice) break;
          const id3V2Header = readId3V2Header(headerSlice);
          if (!id3V2Header) {
            break;
          }
          let contentSlice = this.reader.requestSlice(headerSlice.filePos, id3V2Header.size);
          if (contentSlice instanceof Promise) contentSlice = await contentSlice;
          if (!contentSlice) break;
          parseId3V2Tag(contentSlice, id3V2Header, this.metadataTags);
          currentPos = headerSlice.filePos + id3V2Header.size;
        }
        return this.metadataTags;
      } finally {
        release();
      }
    }
  };
  var AdtsAudioTrackBacking = class {
    constructor(demuxer) {
      this.demuxer = demuxer;
    }
    getType() {
      return "audio";
    }
    getId() {
      return 1;
    }
    getNumber() {
      return 1;
    }
    getTimeResolution() {
      const sampleRate = this.getSampleRate();
      return sampleRate / SAMPLES_PER_AAC_FRAME;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      return null;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    getName() {
      return null;
    }
    getLanguageCode() {
      return UNDETERMINED_LANGUAGE;
    }
    getCodec() {
      return "aac";
    }
    getInternalCodecId() {
      assert(this.demuxer.firstFrameHeader);
      return this.demuxer.firstFrameHeader.objectType;
    }
    getNumberOfChannels() {
      assert(this.demuxer.firstFrameHeader);
      const numberOfChannels = aacChannelMap[this.demuxer.firstFrameHeader.channelConfiguration];
      assert(numberOfChannels !== void 0);
      return numberOfChannels;
    }
    getSampleRate() {
      assert(this.demuxer.firstFrameHeader);
      const sampleRate = aacFrequencyTable[this.demuxer.firstFrameHeader.samplingFrequencyIndex];
      assert(sampleRate !== void 0);
      return sampleRate;
    }
    getDisposition() {
      return {
        ...DEFAULT_TRACK_DISPOSITION
      };
    }
    async getDecoderConfig() {
      assert(this.demuxer.firstFrameHeader);
      return {
        codec: `mp4a.40.${this.demuxer.firstFrameHeader.objectType}`,
        numberOfChannels: this.getNumberOfChannels(),
        sampleRate: this.getSampleRate()
      };
    }
    async getPacketAtIndex(sampleIndex, options) {
      if (sampleIndex === -1) {
        return null;
      }
      const rawSample = this.demuxer.loadedSamples[sampleIndex];
      if (!rawSample) {
        return null;
      }
      let data;
      if (options.metadataOnly) {
        data = PLACEHOLDER_DATA;
      } else {
        let slice = this.demuxer.reader.requestSlice(rawSample.dataStart, rawSample.dataSize);
        if (slice instanceof Promise) slice = await slice;
        if (!slice) {
          return null;
        }
        data = readBytes(slice, rawSample.dataSize);
      }
      return new EncodedPacket(
        data,
        "key",
        rawSample.timestamp,
        rawSample.duration,
        sampleIndex,
        rawSample.dataSize
      );
    }
    getFirstPacket(options) {
      return this.getPacketAtIndex(0, options);
    }
    async getNextPacket(packet, options) {
      const release = await this.demuxer.readingMutex.acquire();
      try {
        const sampleIndex = binarySearchExact(
          this.demuxer.loadedSamples,
          packet.timestamp,
          (x) => x.timestamp
        );
        if (sampleIndex === -1) {
          throw new Error("Packet was not created from this track.");
        }
        const nextIndex = sampleIndex + 1;
        while (nextIndex >= this.demuxer.loadedSamples.length && !this.demuxer.lastSampleLoaded) {
          await this.demuxer.advanceReader();
        }
        return this.getPacketAtIndex(nextIndex, options);
      } finally {
        release();
      }
    }
    async getPacket(timestamp, options) {
      const release = await this.demuxer.readingMutex.acquire();
      try {
        while (true) {
          const index = binarySearchLessOrEqual(
            this.demuxer.loadedSamples,
            timestamp,
            (x) => x.timestamp
          );
          if (index === -1 && this.demuxer.loadedSamples.length > 0) {
            return null;
          }
          if (this.demuxer.lastSampleLoaded) {
            return this.getPacketAtIndex(index, options);
          }
          if (index >= 0 && index + 1 < this.demuxer.loadedSamples.length) {
            return this.getPacketAtIndex(index, options);
          }
          await this.demuxer.advanceReader();
        }
      } finally {
        release();
      }
    }
    getKeyPacket(timestamp, options) {
      return this.getPacket(timestamp, options);
    }
    getNextKeyPacket(packet, options) {
      return this.getNextPacket(packet, options);
    }
  };

  // src/flac/flac-misc.ts
  var getBlockSizeOrUncommon = (bits) => {
    if (bits === 0) {
      return null;
    } else if (bits === 1) {
      return 192;
    } else if (bits >= 2 && bits <= 5) {
      return 144 * 2 ** bits;
    } else if (bits === 6) {
      return "uncommon-u8";
    } else if (bits === 7) {
      return "uncommon-u16";
    } else if (bits >= 8 && bits <= 15) {
      return 2 ** bits;
    } else {
      return null;
    }
  };
  var getSampleRateOrUncommon = (sampleRateBits, streamInfoSampleRate) => {
    switch (sampleRateBits) {
      case 0:
        return streamInfoSampleRate;
      case 1:
        return 88200;
      case 2:
        return 176400;
      case 3:
        return 192e3;
      case 4:
        return 8e3;
      case 5:
        return 16e3;
      case 6:
        return 22050;
      case 7:
        return 24e3;
      case 8:
        return 32e3;
      case 9:
        return 44100;
      case 10:
        return 48e3;
      case 11:
        return 96e3;
      case 12:
        return "uncommon-u8";
      case 13:
        return "uncommon-u16";
      case 14:
        return "uncommon-u16-10";
      default:
        return null;
    }
  };
  var readCodedNumber = (fileSlice) => {
    let ones = 0;
    const bitstream1 = new Bitstream(readBytes(fileSlice, 1));
    while (bitstream1.readBits(1) === 1) {
      ones++;
    }
    if (ones === 0) {
      return bitstream1.readBits(7);
    }
    const bitArray = [];
    const extraBytes = ones - 1;
    const bitstream2 = new Bitstream(readBytes(fileSlice, extraBytes));
    const firstByteBits = 8 - ones - 1;
    for (let i = 0; i < firstByteBits; i++) {
      bitArray.unshift(bitstream1.readBits(1));
    }
    for (let i = 0; i < extraBytes; i++) {
      for (let j = 0; j < 8; j++) {
        const val = bitstream2.readBits(1);
        if (j < 2) {
          continue;
        }
        bitArray.unshift(val);
      }
    }
    const encoded = bitArray.reduce((acc, bit, index) => {
      return acc | bit << index;
    }, 0);
    return encoded;
  };
  var readBlockSize = (slice, blockSizeBits) => {
    if (blockSizeBits === "uncommon-u16") {
      return readU16Be(slice) + 1;
    } else if (blockSizeBits === "uncommon-u8") {
      return readU8(slice) + 1;
    } else if (typeof blockSizeBits === "number") {
      return blockSizeBits;
    } else {
      assertNever(blockSizeBits);
      assert(false);
    }
  };
  var readSampleRate = (slice, sampleRateOrUncommon) => {
    if (sampleRateOrUncommon === "uncommon-u16") {
      return readU16Be(slice);
    }
    if (sampleRateOrUncommon === "uncommon-u16-10") {
      return readU16Be(slice) * 10;
    }
    if (sampleRateOrUncommon === "uncommon-u8") {
      return readU8(slice);
    }
    if (typeof sampleRateOrUncommon === "number") {
      return sampleRateOrUncommon;
    }
    return null;
  };
  var calculateCrc8 = (data) => {
    const polynomial = 7;
    let crc = 0;
    for (const byte of data) {
      crc ^= byte;
      for (let i = 0; i < 8; i++) {
        if ((crc & 128) !== 0) {
          crc = crc << 1 ^ polynomial;
        } else {
          crc <<= 1;
        }
        crc &= 255;
      }
    }
    return crc;
  };

  // src/flac/flac-demuxer.ts
  var FlacDemuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.loadedSamples = [];
      // All samples from the start of the file to lastLoadedPos
      this.metadataPromise = null;
      this.trackBacking = null;
      this.metadataTags = {};
      this.audioInfo = null;
      this.lastLoadedPos = null;
      this.blockingBit = null;
      this.readingMutex = new AsyncMutex();
      this.lastSampleLoaded = false;
      this.reader = input._reader;
    }
    async getMetadataTags() {
      await this.readMetadata();
      return this.metadataTags;
    }
    async getTrackBackings() {
      await this.readMetadata();
      assert(this.trackBacking);
      return [this.trackBacking];
    }
    async getMimeType() {
      return "audio/flac";
    }
    async readMetadata() {
      return this.metadataPromise ??= (async () => {
        let currentPos = 0;
        while (true) {
          let headerSlice = this.reader.requestSlice(currentPos, ID3_V2_HEADER_SIZE);
          if (headerSlice instanceof Promise) headerSlice = await headerSlice;
          if (!headerSlice) {
            this.lastSampleLoaded = true;
            return;
          }
          const id3V2Header = readId3V2Header(headerSlice);
          if (!id3V2Header) {
            break;
          }
          let contentSlice = this.reader.requestSlice(headerSlice.filePos, id3V2Header.size);
          if (contentSlice instanceof Promise) contentSlice = await contentSlice;
          assert(contentSlice);
          parseId3V2Tag(contentSlice, id3V2Header, this.metadataTags);
          currentPos = headerSlice.filePos + id3V2Header.size;
        }
        currentPos += 4;
        while (this.reader.fileSize === null || currentPos < this.reader.fileSize) {
          let sizeSlice = this.reader.requestSlice(currentPos, 4);
          if (sizeSlice instanceof Promise) sizeSlice = await sizeSlice;
          currentPos += 4;
          if (sizeSlice === null) {
            throw new Error(
              `Metadata block at position ${currentPos} is too small! Corrupted file.`
            );
          }
          assert(sizeSlice);
          const byte = readU8(sizeSlice);
          const size = readU24Be(sizeSlice);
          const isLastMetadata = (byte & 128) !== 0;
          const metaBlockType = byte & 127;
          switch (metaBlockType) {
            case 0 /* STREAMINFO */: {
              let streamInfoBlock = this.reader.requestSlice(
                currentPos,
                size
              );
              if (streamInfoBlock instanceof Promise) streamInfoBlock = await streamInfoBlock;
              assert(streamInfoBlock);
              if (streamInfoBlock === null) {
                throw new Error(
                  `StreamInfo block at position ${currentPos} is too small! Corrupted file.`
                );
              }
              const streamInfoBytes = readBytes(streamInfoBlock, 34);
              const bitstream = new Bitstream(streamInfoBytes);
              const minimumBlockSize = bitstream.readBits(16);
              const maximumBlockSize = bitstream.readBits(16);
              const minimumFrameSize = bitstream.readBits(24);
              const maximumFrameSize = bitstream.readBits(24);
              const sampleRate = bitstream.readBits(20);
              const numberOfChannels = bitstream.readBits(3) + 1;
              bitstream.readBits(5);
              const totalSamples = bitstream.readBits(36);
              bitstream.skipBits(16 * 8);
              const description = new Uint8Array(42);
              description.set(new Uint8Array([102, 76, 97, 67]), 0);
              description.set(new Uint8Array([128, 0, 0, 34]), 4);
              description.set(streamInfoBytes, 8);
              this.audioInfo = {
                numberOfChannels,
                sampleRate,
                totalSamples,
                minimumBlockSize,
                maximumBlockSize,
                minimumFrameSize,
                maximumFrameSize,
                description
              };
              this.trackBacking = new FlacAudioTrackBacking(this);
              break;
            }
            case 4 /* VORBIS_COMMENT */: {
              let vorbisCommentBlock = this.reader.requestSlice(
                currentPos,
                size
              );
              if (vorbisCommentBlock instanceof Promise) vorbisCommentBlock = await vorbisCommentBlock;
              assert(vorbisCommentBlock);
              readVorbisComments(
                readBytes(vorbisCommentBlock, size),
                this.metadataTags
              );
              break;
            }
            case 6 /* PICTURE */: {
              let pictureBlock = this.reader.requestSlice(
                currentPos,
                size
              );
              if (pictureBlock instanceof Promise) pictureBlock = await pictureBlock;
              assert(pictureBlock);
              const pictureType = readU32Be(pictureBlock);
              const mediaTypeLength = readU32Be(pictureBlock);
              const mediaType = textDecoder.decode(
                readBytes(pictureBlock, mediaTypeLength)
              );
              const descriptionLength = readU32Be(pictureBlock);
              const description = textDecoder.decode(
                readBytes(pictureBlock, descriptionLength)
              );
              pictureBlock.skip(4 + 4 + 4 + 4);
              const dataLength = readU32Be(pictureBlock);
              const data = readBytes(pictureBlock, dataLength);
              this.metadataTags.images ??= [];
              this.metadataTags.images.push({
                data,
                mimeType: mediaType,
                // https://www.rfc-editor.org/rfc/rfc9639.html#table13
                kind: pictureType === 3 ? "coverFront" : pictureType === 4 ? "coverBack" : "unknown",
                description
              });
              break;
            }
            default:
              break;
          }
          currentPos += size;
          if (isLastMetadata) {
            this.lastLoadedPos = currentPos;
            break;
          }
        }
        if (!this.audioInfo) {
          throw new Error("Missing STREAMINFO metadata block! Corrupted FLAC file.");
        }
      })();
    }
    async readNextFlacFrame({
      startPos,
      isFirstPacket
    }) {
      assert(this.audioInfo);
      const minimumHeaderLength = 6;
      const maximumHeaderLength = 16;
      const minimumFrameLength = 10;
      const maximumFrameLength = this.audioInfo.maximumBlockSize * this.audioInfo.numberOfChannels * 4 + maximumHeaderLength + 2;
      const effectiveMinFrameSize = this.audioInfo.minimumFrameSize || minimumFrameLength;
      const effectiveMaxFrameSize = this.audioInfo.maximumFrameSize || maximumFrameLength;
      const maximumSliceLength = effectiveMaxFrameSize + maximumHeaderLength;
      const slice = await this.reader.requestSliceRange(
        startPos,
        maximumHeaderLength,
        maximumSliceLength
      );
      if (!slice) {
        return null;
      }
      const frameHeader = this.readFlacFrameHeader({
        slice,
        isFirstPacket
      });
      if (!frameHeader) {
        return null;
      }
      slice.filePos = startPos + effectiveMinFrameSize;
      while (true) {
        if (slice.filePos > slice.end - minimumHeaderLength) {
          return {
            num: frameHeader.num,
            blockSize: frameHeader.blockSize,
            sampleRate: frameHeader.sampleRate,
            size: slice.end - startPos,
            isLastFrame: true
          };
        }
        const nextByte = readU8(slice);
        if (nextByte === 255) {
          const positionBeforeReading = slice.filePos;
          const byteAfterNextByte = readU8(slice);
          const expected = this.blockingBit === 1 ? 249 : 248;
          if (byteAfterNextByte !== expected) {
            slice.filePos = positionBeforeReading;
            continue;
          }
          slice.skip(-2);
          const lengthIfNextFlacFrameHeaderIsLegit = slice.filePos - startPos;
          const nextFrameHeader = this.readFlacFrameHeader({
            slice,
            isFirstPacket: false
          });
          if (!nextFrameHeader) {
            slice.filePos = positionBeforeReading;
            continue;
          }
          if (this.blockingBit === 0) {
            if (nextFrameHeader.num - frameHeader.num !== 1) {
              slice.filePos = positionBeforeReading;
              continue;
            }
          } else {
            if (nextFrameHeader.num - frameHeader.num !== frameHeader.blockSize) {
              slice.filePos = positionBeforeReading;
              continue;
            }
          }
          return {
            num: frameHeader.num,
            blockSize: frameHeader.blockSize,
            sampleRate: frameHeader.sampleRate,
            size: lengthIfNextFlacFrameHeaderIsLegit,
            isLastFrame: false
          };
        }
      }
    }
    readFlacFrameHeader({
      slice,
      isFirstPacket
    }) {
      const startOffset = slice.filePos;
      const bytes2 = readBytes(slice, 4);
      const bitstream = new Bitstream(bytes2);
      const bits = bitstream.readBits(15);
      if (bits !== 32764) {
        return null;
      }
      if (this.blockingBit === null) {
        assert(isFirstPacket);
        const newBlockingBit = bitstream.readBits(1);
        this.blockingBit = newBlockingBit;
      } else if (this.blockingBit === 1) {
        assert(!isFirstPacket);
        const newBlockingBit = bitstream.readBits(1);
        if (newBlockingBit !== 1) {
          return null;
        }
      } else if (this.blockingBit === 0) {
        assert(!isFirstPacket);
        const newBlockingBit = bitstream.readBits(1);
        if (newBlockingBit !== 0) {
          return null;
        }
      } else {
        throw new Error("Invalid blocking bit");
      }
      const blockSizeOrUncommon = getBlockSizeOrUncommon(bitstream.readBits(4));
      if (!blockSizeOrUncommon) {
        return null;
      }
      assert(this.audioInfo);
      const sampleRateOrUncommon = getSampleRateOrUncommon(
        bitstream.readBits(4),
        this.audioInfo.sampleRate
      );
      if (!sampleRateOrUncommon) {
        return null;
      }
      bitstream.readBits(4);
      bitstream.readBits(3);
      const reservedZero = bitstream.readBits(1);
      if (reservedZero !== 0) {
        return null;
      }
      const num = readCodedNumber(slice);
      const blockSize = readBlockSize(slice, blockSizeOrUncommon);
      const sampleRate = readSampleRate(slice, sampleRateOrUncommon);
      if (sampleRate === null) {
        return null;
      }
      if (sampleRate !== this.audioInfo.sampleRate) {
        return null;
      }
      const size = slice.filePos - startOffset;
      const crc = readU8(slice);
      slice.skip(-size);
      slice.skip(-1);
      const crcCalculated = calculateCrc8(readBytes(slice, size));
      if (crc !== crcCalculated) {
        return null;
      }
      return { num, blockSize, sampleRate };
    }
    async advanceReader() {
      await this.readMetadata();
      assert(this.lastLoadedPos !== null);
      assert(this.audioInfo);
      const startPos = this.lastLoadedPos;
      const frame = await this.readNextFlacFrame({
        startPos,
        isFirstPacket: this.loadedSamples.length === 0
      });
      if (!frame) {
        this.lastSampleLoaded = true;
        return;
      }
      const lastSample = this.loadedSamples[this.loadedSamples.length - 1];
      const blockOffset = lastSample ? lastSample.blockOffset + lastSample.blockSize : 0;
      const sample = {
        blockOffset,
        blockSize: frame.blockSize,
        byteOffset: startPos,
        byteSize: frame.size
      };
      this.lastLoadedPos = this.lastLoadedPos + frame.size;
      this.loadedSamples.push(sample);
      if (frame.isLastFrame) {
        this.lastSampleLoaded = true;
        return;
      }
    }
  };
  var FlacAudioTrackBacking = class {
    constructor(demuxer) {
      this.demuxer = demuxer;
    }
    getType() {
      return "audio";
    }
    getId() {
      return 1;
    }
    getNumber() {
      return 1;
    }
    getCodec() {
      return "flac";
    }
    getInternalCodecId() {
      return null;
    }
    getNumberOfChannels() {
      assert(this.demuxer.audioInfo);
      return this.demuxer.audioInfo.numberOfChannels;
    }
    getSampleRate() {
      assert(this.demuxer.audioInfo);
      return this.demuxer.audioInfo.sampleRate;
    }
    getName() {
      return null;
    }
    getLanguageCode() {
      return UNDETERMINED_LANGUAGE;
    }
    getTimeResolution() {
      assert(this.demuxer.audioInfo);
      return this.demuxer.audioInfo.sampleRate;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      assert(this.demuxer.audioInfo);
      if (this.demuxer.audioInfo.totalSamples === 0) {
        return null;
      }
      return this.demuxer.audioInfo.totalSamples / this.demuxer.audioInfo.sampleRate;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    getDisposition() {
      return {
        ...DEFAULT_TRACK_DISPOSITION
      };
    }
    async getDecoderConfig() {
      assert(this.demuxer.audioInfo);
      return {
        codec: "flac",
        numberOfChannels: this.demuxer.audioInfo.numberOfChannels,
        sampleRate: this.demuxer.audioInfo.sampleRate,
        description: this.demuxer.audioInfo.description
      };
    }
    async getPacket(timestamp, options) {
      assert(this.demuxer.audioInfo);
      if (timestamp < 0) {
        return null;
      }
      const release = await this.demuxer.readingMutex.acquire();
      try {
        while (true) {
          const packetIndex = binarySearchLessOrEqual(
            this.demuxer.loadedSamples,
            timestamp,
            (x) => x.blockOffset / this.demuxer.audioInfo.sampleRate
          );
          if (packetIndex === -1) {
            await this.demuxer.advanceReader();
            continue;
          }
          const packet = this.demuxer.loadedSamples[packetIndex];
          const sampleTimestamp = packet.blockOffset / this.demuxer.audioInfo.sampleRate;
          const sampleDuration = packet.blockSize / this.demuxer.audioInfo.sampleRate;
          if (sampleTimestamp + sampleDuration <= timestamp) {
            if (this.demuxer.lastSampleLoaded) {
              return this.getPacketAtIndex(
                this.demuxer.loadedSamples.length - 1,
                options
              );
            }
            await this.demuxer.advanceReader();
            continue;
          }
          return this.getPacketAtIndex(packetIndex, options);
        }
      } finally {
        release();
      }
    }
    async getNextPacket(packet, options) {
      const release = await this.demuxer.readingMutex.acquire();
      try {
        const nextIndex = packet.sequenceNumber + 1;
        if (this.demuxer.lastSampleLoaded && nextIndex >= this.demuxer.loadedSamples.length) {
          return null;
        }
        while (nextIndex >= this.demuxer.loadedSamples.length && !this.demuxer.lastSampleLoaded) {
          await this.demuxer.advanceReader();
        }
        return this.getPacketAtIndex(nextIndex, options);
      } finally {
        release();
      }
    }
    getKeyPacket(timestamp, options) {
      return this.getPacket(timestamp, options);
    }
    getNextKeyPacket(packet, options) {
      return this.getNextPacket(packet, options);
    }
    async getPacketAtIndex(sampleIndex, options) {
      const rawSample = this.demuxer.loadedSamples[sampleIndex];
      if (!rawSample) {
        return null;
      }
      let data;
      if (options.metadataOnly) {
        data = PLACEHOLDER_DATA;
      } else {
        let slice = this.demuxer.reader.requestSlice(
          rawSample.byteOffset,
          rawSample.byteSize
        );
        if (slice instanceof Promise) slice = await slice;
        if (!slice) {
          return null;
        }
        data = readBytes(slice, rawSample.byteSize);
      }
      assert(this.demuxer.audioInfo);
      const timestamp = rawSample.blockOffset / this.demuxer.audioInfo.sampleRate;
      const duration = rawSample.blockSize / this.demuxer.audioInfo.sampleRate;
      return new EncodedPacket(
        data,
        "key",
        timestamp,
        duration,
        sampleIndex,
        rawSample.byteSize
      );
    }
    async getFirstPacket(options) {
      while (this.demuxer.loadedSamples.length === 0 && !this.demuxer.lastSampleLoaded) {
        await this.demuxer.advanceReader();
      }
      return this.getPacketAtIndex(0, options);
    }
  };

  // src/mpeg-ts/mpeg-ts-misc.ts
  var TIMESCALE = 9e4;
  var TS_PACKET_SIZE = 188;
  var buildMpegTsMimeType = (codecStrings) => {
    let string = "video/MP2T";
    const uniqueCodecStrings = [...new Set(codecStrings.filter(Boolean))];
    if (uniqueCodecStrings.length > 0) {
      string += `; codecs="${uniqueCodecStrings.join(", ")}"`;
    }
    return string;
  };

  // src/mpeg-ts/mpeg-ts-demuxer.ts
  var MISSING_PTS_ERROR_MESSAGE = "PES packet is missing PTS where it was expected. PES packets without PTS are not currently supported. If you think this file should be supported, please report it.";
  var ignoredStreamTypes = /* @__PURE__ */ new Set();
  var MpegTsDemuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.metadataPromise = null;
      this.elementaryStreams = [];
      this.trackBackingEntries = [];
      this.packetOffset = 0;
      this.packetStride = -1;
      this.sectionEndPositions = [];
      this.seekChunkSize = 5 * 1024 * 1024;
      // 5 MiB, picked because most HLS segments are below this size
      this.minReferencePointByteDistance = -1;
      this.reader = input._reader;
    }
    async readMetadata() {
      return this.metadataPromise ??= (async () => {
        const lengthToCheck = TS_PACKET_SIZE + 16 + 1;
        let startingSlice = this.reader.requestSlice(0, lengthToCheck);
        if (startingSlice instanceof Promise) startingSlice = await startingSlice;
        assert(startingSlice);
        const startingBytes = readBytes(startingSlice, lengthToCheck);
        if (startingBytes[0] === 71 && startingBytes[TS_PACKET_SIZE] === 71) {
          this.packetOffset = 0;
          this.packetStride = TS_PACKET_SIZE;
        } else if (startingBytes[0] === 71 && startingBytes[TS_PACKET_SIZE + 16] === 71) {
          this.packetOffset = 0;
          this.packetStride = TS_PACKET_SIZE + 16;
        } else if (startingBytes[4] === 71 && startingBytes[4 + TS_PACKET_SIZE + 4] === 71) {
          this.packetOffset = 4;
          this.packetStride = TS_PACKET_SIZE + 4;
        } else {
          throw new Error("Unreachable.");
        }
        const MIN_REFERENCE_POINT_PACKET_DISTANCE = 256;
        this.minReferencePointByteDistance = MIN_REFERENCE_POINT_PACKET_DISTANCE * this.packetStride;
        let currentPos = this.packetOffset;
        let programMapPid = null;
        let hasProgramAssociationTable = false;
        let hasProgramMap = false;
        while (true) {
          const packetHeader = await this.readPacketHeader(currentPos);
          if (!packetHeader) {
            break;
          }
          if (packetHeader.payloadUnitStartIndicator === 0) {
            currentPos += this.packetStride;
            continue;
          }
          if (hasProgramMap && !this.elementaryStreams.some((x) => x.pid === packetHeader.pid)) {
            currentPos += this.packetStride;
            continue;
          }
          const section = await this.readSection(
            currentPos,
            true,
            !hasProgramMap
            // Expect contiguous sections as long as we don't have the PMT
          );
          if (!section) {
            break;
          }
          const BYTES_BEFORE_SECTION_LENGTH = 3;
          const BITS_IN_CRC_32 = 32;
          let isProbablyProgramMap = false;
          if (!hasProgramMap && section.pid !== 0) {
            const isPesPacket = section.payload[0] === 0 && section.payload[1] === 0 && section.payload[2] === 1;
            if (!isPesPacket) {
              const bitstream = new Bitstream(section.payload);
              const pointerField = bitstream.readAlignedByte();
              bitstream.skipBits(8 * pointerField);
              const tableId = bitstream.readBits(8);
              isProbablyProgramMap = tableId === 2;
            }
          }
          if (section.pid === 0 && !hasProgramAssociationTable) {
            const bitstream = new Bitstream(section.payload);
            const pointerField = bitstream.readAlignedByte();
            bitstream.skipBits(8 * pointerField);
            bitstream.skipBits(14);
            const sectionLength = bitstream.readBits(10);
            bitstream.skipBits(40);
            while (8 * (sectionLength + BYTES_BEFORE_SECTION_LENGTH) - bitstream.pos > BITS_IN_CRC_32) {
              const programNumber = bitstream.readBits(16);
              bitstream.skipBits(3);
              const id = bitstream.readBits(13);
              if (programNumber !== 0) {
                if (programMapPid !== null) {
                  throw new Error("Only files with a single program are supported.");
                } else {
                  programMapPid = id;
                }
              }
            }
            if (programMapPid === null) {
              throw new Error("Program Association Table must link to a Program Map Table.");
            }
            hasProgramAssociationTable = true;
          } else if ((section.pid === programMapPid || isProbablyProgramMap) && !hasProgramMap) {
            const bitstream = new Bitstream(section.payload);
            const pointerField = bitstream.readAlignedByte();
            bitstream.skipBits(8 * pointerField);
            bitstream.skipBits(12);
            const sectionLength = bitstream.readBits(12);
            bitstream.skipBits(43);
            const pcrPid = bitstream.readBits(13);
            bitstream.skipBits(6);
            const programInfoLength = bitstream.readBits(10);
            bitstream.skipBits(8 * programInfoLength);
            while (8 * (sectionLength + BYTES_BEFORE_SECTION_LENGTH) - bitstream.pos > BITS_IN_CRC_32) {
              const streamType = bitstream.readBits(8);
              bitstream.skipBits(3);
              const elementaryPid = bitstream.readBits(13);
              bitstream.skipBits(6);
              const esInfoLength = bitstream.readBits(10);
              const esInfoEndPos = bitstream.pos + 8 * esInfoLength;
              let hasAc3Descriptor = false;
              let hasEac3Descriptor = false;
              while (bitstream.pos < esInfoEndPos) {
                const descriptorTag = bitstream.readBits(8);
                const descriptorLength = bitstream.readBits(8);
                if (descriptorTag === 106) {
                  hasAc3Descriptor = true;
                } else if (descriptorTag === 122 || descriptorTag === 204) {
                  hasEac3Descriptor = true;
                }
                bitstream.skipBits(8 * descriptorLength);
              }
              let info = null;
              switch (streamType) {
                case 27 /* AVC */:
                case 36 /* HEVC */:
                  {
                    const codec = streamType === 27 /* AVC */ ? "avc" : "hevc";
                    info = {
                      type: "video",
                      codec,
                      decoderConfig: null,
                      avcCodecInfo: null,
                      hevcCodecInfo: null,
                      colorSpace: {
                        primaries: null,
                        transfer: null,
                        matrix: null,
                        fullRange: null
                      },
                      width: -1,
                      height: -1,
                      squarePixelWidth: -1,
                      squarePixelHeight: -1,
                      reorderSize: -1
                    };
                  }
                  ;
                  break;
                case 3 /* MP3_MPEG1 */:
                case 4 /* MP3_MPEG2 */:
                case 15 /* AAC */:
                case 129 /* AC3_SYSTEM_A */:
                case 135 /* EAC3_SYSTEM_A */:
                  {
                    let codec;
                    if (streamType === 3 /* MP3_MPEG1 */ || streamType === 4 /* MP3_MPEG2 */) {
                      codec = "mp3";
                    } else if (streamType === 15 /* AAC */) {
                      codec = "aac";
                    } else if (streamType === 129 /* AC3_SYSTEM_A */) {
                      codec = "ac3";
                    } else if (streamType === 135 /* EAC3_SYSTEM_A */) {
                      codec = "eac3";
                    } else {
                      throw new Error("Unreachable.");
                    }
                    info = {
                      type: "audio",
                      codec,
                      decoderConfig: null,
                      aacCodecInfo: null,
                      numberOfChannels: -1,
                      sampleRate: -1
                    };
                  }
                  ;
                  break;
                case 6 /* PRIVATE_DATA */:
                  {
                    if (hasEac3Descriptor) {
                      info = {
                        type: "audio",
                        codec: "eac3",
                        decoderConfig: null,
                        aacCodecInfo: null,
                        numberOfChannels: -1,
                        sampleRate: -1
                      };
                    } else if (hasAc3Descriptor) {
                      info = {
                        type: "audio",
                        codec: "ac3",
                        decoderConfig: null,
                        aacCodecInfo: null,
                        numberOfChannels: -1,
                        sampleRate: -1
                      };
                    }
                  }
                  ;
                  break;
                default: {
                  if (!ignoredStreamTypes.has(streamType)) {
                    Logging._warn(
                      `Note: MPEG-TS streams with stream_type 0x${streamType.toString(16)} are not currently supported.`
                    );
                    ignoredStreamTypes.add(streamType);
                  }
                }
              }
              if (info) {
                this.elementaryStreams.push({
                  demuxer: this,
                  pid: elementaryPid,
                  streamType,
                  initialized: false,
                  firstSection: null,
                  canBeTrustedWithKeyPackets: false,
                  info,
                  referencePesPackets: []
                });
              }
            }
            hasProgramMap = true;
          } else {
            const elementaryStream = this.elementaryStreams.find((x) => x.pid === section.pid);
            outer:
              if (elementaryStream && !elementaryStream.initialized) {
                const pesPacket = readPesPacket(section, true);
                if (!pesPacket) {
                  throw new Error(
                    `Couldn't read first PES packet for Elementary Stream with PID ${elementaryStream.pid}`
                  );
                }
                elementaryStream.firstSection = section;
                elementaryStream.canBeTrustedWithKeyPackets = section.randomAccessIndicator === 1;
                if (this.input._initInput) {
                  const initDemuxer = await this.input._initInput._getDemuxer();
                  const matchingStream = initDemuxer.elementaryStreams.find((x) => x.pid === section.pid && x.info.codec === elementaryStream.info.codec);
                  if (matchingStream) {
                    elementaryStream.info = matchingStream.info;
                    elementaryStream.initialized = true;
                    break outer;
                  }
                }
                const context = new PacketReadingContext(elementaryStream, pesPacket);
                if (elementaryStream.info.type === "video") {
                  while (true) {
                    const contextAlias = context;
                    contextAlias.suppliedPacket = null;
                    await context.markNextPacket();
                    if (elementaryStream.info.codec === "avc") {
                      if (!context.suppliedPacket) {
                        throw new Error(
                          "Invalid AVC video stream; could not extract AVCDecoderConfigurationRecord from any packet."
                        );
                      }
                      elementaryStream.info.avcCodecInfo = extractAvcDecoderConfigurationRecord(context.suppliedPacket.data);
                      if (!elementaryStream.info.avcCodecInfo) {
                        continue;
                      }
                      const spsUnit = elementaryStream.info.avcCodecInfo.sequenceParameterSets[0];
                      assert(spsUnit);
                      const spsInfo = parseAvcSps(spsUnit);
                      elementaryStream.info.width = spsInfo.displayWidth;
                      elementaryStream.info.height = spsInfo.displayHeight;
                      const num = spsInfo.pixelAspectRatio.num;
                      const den = spsInfo.pixelAspectRatio.den;
                      if (num > 0 && den > 0) {
                        if (num > den) {
                          elementaryStream.info.squarePixelWidth = Math.round(
                            elementaryStream.info.width * num / den
                          );
                          elementaryStream.info.squarePixelHeight = elementaryStream.info.height;
                        } else {
                          elementaryStream.info.squarePixelWidth = elementaryStream.info.width;
                          elementaryStream.info.squarePixelHeight = Math.round(
                            elementaryStream.info.height * den / num
                          );
                        }
                      }
                      elementaryStream.info.colorSpace = {
                        primaries: COLOR_PRIMARIES_MAP_INVERSE[spsInfo.colourPrimaries],
                        transfer: TRANSFER_CHARACTERISTICS_MAP_INVERSE[spsInfo.transferCharacteristics],
                        matrix: MATRIX_COEFFICIENTS_MAP_INVERSE[spsInfo.matrixCoefficients],
                        fullRange: !!spsInfo.fullRangeFlag
                      };
                      elementaryStream.info.reorderSize = spsInfo.maxDecFrameBuffering;
                      break;
                    } else if (elementaryStream.info.codec === "hevc") {
                      if (!context.suppliedPacket) {
                        throw new Error(
                          "Invalid HEVC video stream; could not extract HVCDecoderConfigurationRecord from first packet."
                        );
                      }
                      elementaryStream.info.hevcCodecInfo = extractHevcDecoderConfigurationRecord(context.suppliedPacket.data);
                      if (!elementaryStream.info.hevcCodecInfo) {
                        continue;
                      }
                      const spsArray = elementaryStream.info.hevcCodecInfo.arrays.find(
                        (a) => a.nalUnitType === 33 /* SPS_NUT */
                      );
                      const spsUnit = spsArray.nalUnits[0];
                      assert(spsUnit);
                      const spsInfo = parseHevcSps(spsUnit);
                      elementaryStream.info.width = spsInfo.displayWidth;
                      elementaryStream.info.height = spsInfo.displayHeight;
                      if (spsInfo.pixelAspectRatio.num > spsInfo.pixelAspectRatio.den) {
                        elementaryStream.info.squarePixelWidth = Math.round(
                          elementaryStream.info.width * spsInfo.pixelAspectRatio.num / spsInfo.pixelAspectRatio.den
                        );
                        elementaryStream.info.squarePixelHeight = elementaryStream.info.height;
                      } else {
                        elementaryStream.info.squarePixelWidth = elementaryStream.info.width;
                        elementaryStream.info.squarePixelHeight = Math.round(
                          elementaryStream.info.height * spsInfo.pixelAspectRatio.den / spsInfo.pixelAspectRatio.num
                        );
                      }
                      elementaryStream.info.colorSpace = {
                        primaries: COLOR_PRIMARIES_MAP_INVERSE[spsInfo.colourPrimaries],
                        transfer: TRANSFER_CHARACTERISTICS_MAP_INVERSE[spsInfo.transferCharacteristics],
                        matrix: MATRIX_COEFFICIENTS_MAP_INVERSE[spsInfo.matrixCoefficients],
                        fullRange: !!spsInfo.fullRangeFlag
                      };
                      elementaryStream.info.reorderSize = spsInfo.maxDecFrameBuffering;
                      break;
                    } else {
                      throw new Error("Unhandled.");
                    }
                  }
                  elementaryStream.info.decoderConfig = {
                    codec: extractVideoCodecString({
                      width: elementaryStream.info.width,
                      height: elementaryStream.info.height,
                      codec: elementaryStream.info.codec,
                      codecDescription: null,
                      colorSpace: elementaryStream.info.colorSpace,
                      avcType: 1,
                      avcCodecInfo: elementaryStream.info.avcCodecInfo,
                      hevcCodecInfo: elementaryStream.info.hevcCodecInfo,
                      vp9CodecInfo: null,
                      av1CodecInfo: null,
                      proresFormat: null
                    }),
                    codedWidth: elementaryStream.info.width,
                    codedHeight: elementaryStream.info.height,
                    colorSpace: elementaryStream.info.colorSpace
                  };
                  if (elementaryStream.info.width !== elementaryStream.info.squarePixelWidth || elementaryStream.info.height !== elementaryStream.info.squarePixelHeight) {
                    elementaryStream.info.decoderConfig.displayAspectWidth = elementaryStream.info.squarePixelWidth;
                    elementaryStream.info.decoderConfig.displayAspectHeight = elementaryStream.info.squarePixelHeight;
                  }
                  elementaryStream.initialized = true;
                } else {
                  await context.markNextPacket();
                  if (!context.suppliedPacket) {
                    throw new Error(
                      `Couldn't parse first media packet for Elementary Stream with PID ${elementaryStream.pid}`
                    );
                  }
                  if (elementaryStream.info.codec === "aac") {
                    const slice = FileSlice4.tempFromBytes(context.suppliedPacket.data);
                    const header = readAdtsFrameHeader(slice);
                    if (!header) {
                      throw new Error(
                        "Invalid AAC audio stream; could not read ADTS frame header from first packet."
                      );
                    }
                    elementaryStream.info.aacCodecInfo = {
                      isMpeg2: false,
                      objectType: header.objectType
                    };
                    elementaryStream.info.numberOfChannels = aacChannelMap[header.channelConfiguration];
                    elementaryStream.info.sampleRate = aacFrequencyTable[header.samplingFrequencyIndex];
                  } else if (elementaryStream.info.codec === "mp3") {
                    const word = readU32Be(FileSlice4.tempFromBytes(context.suppliedPacket.data));
                    const result = readMp3FrameHeader(word, context.suppliedPacket.data.byteLength);
                    if (!result.header) {
                      throw new Error(
                        "Invalid MP3 audio stream; could not read frame header from first packet."
                      );
                    }
                    elementaryStream.info.numberOfChannels = getMp3ChannelCount(result.header.channel);
                    elementaryStream.info.sampleRate = result.header.sampleRate;
                  } else if (elementaryStream.info.codec === "ac3") {
                    const frameInfo = parseAc3SyncFrame(context.suppliedPacket.data);
                    if (!frameInfo) {
                      throw new Error(
                        "Invalid AC-3 audio stream; could not read sync frame from first packet."
                      );
                    }
                    if (frameInfo.fscod === 3) {
                      throw new Error(
                        "Invalid AC-3 audio stream; reserved sample rate code found in first packet."
                      );
                    }
                    elementaryStream.info.numberOfChannels = AC3_ACMOD_CHANNEL_COUNTS[frameInfo.acmod] + frameInfo.lfeon;
                    elementaryStream.info.sampleRate = AC3_SAMPLE_RATES[frameInfo.fscod];
                  } else if (elementaryStream.info.codec === "eac3") {
                    const frameInfo = parseEac3SyncFrame(context.suppliedPacket.data);
                    if (!frameInfo) {
                      throw new Error(
                        "Invalid E-AC-3 audio stream; could not read sync frame from first packet."
                      );
                    }
                    const sampleRate = getEac3SampleRate(frameInfo);
                    if (sampleRate === null) {
                      throw new Error(
                        "Invalid E-AC-3 audio stream; reserved sample rate code found in first packet."
                      );
                    }
                    elementaryStream.info.numberOfChannels = getEac3ChannelCount(frameInfo);
                    elementaryStream.info.sampleRate = sampleRate;
                  } else {
                    throw new Error("Unhandled.");
                  }
                  elementaryStream.info.decoderConfig = {
                    codec: extractAudioCodecString({
                      codec: elementaryStream.info.codec,
                      codecDescription: null,
                      aacCodecInfo: elementaryStream.info.aacCodecInfo
                    }),
                    numberOfChannels: elementaryStream.info.numberOfChannels,
                    sampleRate: elementaryStream.info.sampleRate
                  };
                  elementaryStream.initialized = true;
                }
              }
          }
          const isDone = hasProgramMap && this.elementaryStreams.every((x) => x.initialized);
          if (isDone) {
            break;
          }
          currentPos += this.packetStride;
        }
        if (!hasProgramMap) {
          if (!hasProgramAssociationTable) {
            throw new Error("No Program Association Table found in the file.");
          }
          throw new Error("No Program Map Table found in the file.");
        }
        for (const stream of this.elementaryStreams) {
          if (!stream.initialized) {
            continue;
          }
          if (stream.info.type === "video") {
            this.trackBackingEntries.push(
              new MpegTsVideoTrackBacking(stream)
            );
          } else {
            this.trackBackingEntries.push(
              new MpegTsAudioTrackBacking(stream)
            );
          }
        }
      })();
    }
    async getTrackBackings() {
      await this.readMetadata();
      return this.trackBackingEntries;
    }
    async getMetadataTags() {
      return {};
    }
    async getMimeType() {
      await this.readMetadata();
      const codecStrings = await Promise.all(this.trackBackingEntries.map(
        (x) => x.getDecoderConfig().then((c) => c?.codec ?? null)
      ));
      return buildMpegTsMimeType(codecStrings);
    }
    async readSection(startPos, full, contiguous = false) {
      let endPos = startPos;
      let currentPos = startPos;
      const chunks = [];
      let chunksByteLength = 0;
      let firstPacket = null;
      let mustAddSectionEnd = true;
      let randomAccessIndicator = 0;
      while (true) {
        const packet = await this.readPacket(currentPos);
        currentPos += this.packetStride;
        if (!packet) {
          break;
        }
        if (!firstPacket) {
          if (packet.payloadUnitStartIndicator === 0) {
            break;
          }
          firstPacket = packet;
        } else {
          if (packet.pid !== firstPacket.pid) {
            if (contiguous) {
              break;
            } else {
              continue;
            }
          }
          if (packet.payloadUnitStartIndicator === 1) {
            break;
          }
        }
        const hasAdaptationField = !!(packet.adaptationFieldControl & 2);
        const hasPayload = !!(packet.adaptationFieldControl & 1);
        let adaptationFieldLength = 0;
        if (hasAdaptationField) {
          adaptationFieldLength = 1 + packet.body[0];
          if (packet === firstPacket && adaptationFieldLength > 1) {
            randomAccessIndicator = packet.body[1] >> 6 & 1;
          }
        }
        if (hasPayload) {
          if (adaptationFieldLength === 0) {
            chunks.push(packet.body);
            chunksByteLength += packet.body.byteLength;
          } else {
            chunks.push(packet.body.subarray(adaptationFieldLength));
            chunksByteLength += packet.body.byteLength - adaptationFieldLength;
          }
        }
        endPos = currentPos;
        if (!full && chunksByteLength >= 64) {
          mustAddSectionEnd = false;
          break;
        }
        const isKnownSectionEnd = binarySearchExact(this.sectionEndPositions, endPos, (x) => x) !== -1;
        if (isKnownSectionEnd) {
          mustAddSectionEnd = false;
          break;
        }
      }
      if (mustAddSectionEnd) {
        const index = binarySearchLessOrEqual(this.sectionEndPositions, endPos, (x) => x);
        this.sectionEndPositions.splice(index + 1, 0, endPos);
      }
      if (!firstPacket) {
        return null;
      }
      let merged;
      if (chunks.length === 1) {
        merged = chunks[0];
      } else {
        const totalLength = chunks.reduce((sum, chunk) => sum + chunk.length, 0);
        merged = new Uint8Array(totalLength);
        let offset = 0;
        for (const chunk of chunks) {
          merged.set(chunk, offset);
          offset += chunk.length;
        }
      }
      return {
        startPos,
        endPos: full ? endPos : null,
        pid: firstPacket.pid,
        payload: merged,
        randomAccessIndicator
      };
    }
    async readPacketHeader(pos) {
      let slice = this.reader.requestSlice(pos, 4);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) {
        return null;
      }
      const syncByte = readU8(slice);
      if (syncByte !== 71) {
        throw new Error("Invalid TS packet sync byte. Likely an internal bug, please report this file.");
      }
      const nextTwoBytes = readU16Be(slice);
      const transportErrorIndicator = nextTwoBytes >> 15;
      const payloadUnitStartIndicator = nextTwoBytes >> 14 & 1;
      const transportPriority = nextTwoBytes >> 13 & 1;
      const pid = nextTwoBytes & 8191;
      const nextByte = readU8(slice);
      const transportScramblingControl = nextByte >> 6;
      const adaptationFieldControl = nextByte >> 4 & 3;
      const continuityCounter = nextByte & 15;
      return {
        payloadUnitStartIndicator,
        pid,
        adaptationFieldControl
      };
    }
    async readPacket(pos) {
      let slice = this.reader.requestSlice(pos, TS_PACKET_SIZE);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) {
        return null;
      }
      const bytes2 = readBytes(slice, TS_PACKET_SIZE);
      const syncByte = bytes2[0];
      if (syncByte !== 71) {
        throw new Error("Invalid TS packet sync byte. Likely an internal bug, please report this file.");
      }
      const nextTwoBytes = (bytes2[1] << 8) + bytes2[2];
      const transportErrorIndicator = nextTwoBytes >> 15;
      const payloadUnitStartIndicator = nextTwoBytes >> 14 & 1;
      const transportPriority = nextTwoBytes >> 13 & 1;
      const pid = nextTwoBytes & 8191;
      const nextByte = bytes2[3];
      const transportScramblingControl = nextByte >> 6;
      const adaptationFieldControl = nextByte >> 4 & 3;
      const continuityCounter = nextByte & 15;
      return {
        payloadUnitStartIndicator,
        pid,
        adaptationFieldControl,
        body: bytes2.subarray(4)
      };
    }
  };
  var readPesPacketHeader = (section, expectPts) => {
    if (section.payload.byteLength < 3) {
      return null;
    }
    const bitstream = new Bitstream(section.payload);
    const startCodePrefix = bitstream.readBits(24);
    if (startCodePrefix !== 1) {
      return null;
    }
    const streamId = bitstream.readBits(8);
    bitstream.skipBits(16);
    if (streamId === 188 || streamId === 190 || streamId === 191 || streamId === 240 || streamId === 241 || streamId === 255 || streamId === 242 || streamId === 248) {
      return null;
    }
    bitstream.skipBits(8);
    const ptsDtsFlags = bitstream.readBits(2);
    bitstream.skipBits(14);
    let pts = null;
    if (ptsDtsFlags === 2 || ptsDtsFlags === 3) {
      pts = 0;
      bitstream.skipBits(4);
      pts += bitstream.readBits(3) * (1 << 30);
      bitstream.skipBits(1);
      pts += bitstream.readBits(15) * (1 << 15);
      bitstream.skipBits(1);
      pts += bitstream.readBits(15);
    } else {
      if (expectPts) {
        throw new Error(MISSING_PTS_ERROR_MESSAGE);
      }
    }
    return {
      sectionStartPos: section.startPos,
      sectionEndPos: section.endPos,
      pts,
      randomAccessIndicator: section.randomAccessIndicator
    };
  };
  var readPesPacket = (section, expectPts) => {
    assert(section.endPos !== null);
    const header = readPesPacketHeader(section, expectPts);
    if (!header) {
      return null;
    }
    const bitstream = new Bitstream(section.payload);
    bitstream.skipBits(32);
    const pesPacketLength = bitstream.readBits(16);
    const BYTES_UNTIL_END_OF_PES_PACKET_LENGTH = 6;
    bitstream.skipBits(16);
    const pesHeaderDataLength = bitstream.readBits(8);
    const pesHeaderEndPos = bitstream.pos + 8 * pesHeaderDataLength;
    bitstream.pos = pesHeaderEndPos;
    const bytePos = pesHeaderEndPos / 8;
    assert(Number.isInteger(bytePos));
    const data = section.payload.subarray(
      bytePos,
      // "A value of 0 indicates that the PES packet length is neither specified nor bounded and is allowed only in
      // PES packets whose payload consists of bytes from a video elementary stream contained in
      // transport stream packets."
      pesPacketLength > 0 ? BYTES_UNTIL_END_OF_PES_PACKET_LENGTH + pesPacketLength : section.payload.byteLength
    );
    return {
      ...header,
      data
    };
  };
  var MpegTsTrackBacking = class _MpegTsTrackBacking {
    constructor(elementaryStream) {
      this.elementaryStream = elementaryStream;
      this.packetBuffers = /* @__PURE__ */ new WeakMap();
      /** Used for recreating PacketBuffers if necessary. */
      this.packetSectionStarts = /* @__PURE__ */ new WeakMap();
    }
    getId() {
      return this.elementaryStream.pid;
    }
    getNumber() {
      const demuxer = this.elementaryStream.demuxer;
      const trackType = this.elementaryStream.info.type;
      let number = 0;
      for (const backing of demuxer.trackBackingEntries) {
        if (backing.getType() === trackType) {
          number++;
        }
        assert(backing instanceof _MpegTsTrackBacking);
        if (backing.elementaryStream === this.elementaryStream) {
          break;
        }
      }
      return number;
    }
    getCodec() {
      throw new Error("Not implemented on base class.");
    }
    getInternalCodecId() {
      return this.elementaryStream.streamType;
    }
    getName() {
      return null;
    }
    getLanguageCode() {
      return UNDETERMINED_LANGUAGE;
    }
    getDisposition() {
      return {
        ...DEFAULT_TRACK_DISPOSITION,
        primary: false
      };
    }
    getTimeResolution() {
      return TIMESCALE;
    }
    isRelativeToUnixEpoch() {
      return false;
    }
    getUnixTimeForTimestamp() {
      return null;
    }
    getPairingMask() {
      return 1n;
    }
    getBitrate() {
      return null;
    }
    getAverageBitrate() {
      return null;
    }
    async getDurationFromMetadata() {
      return null;
    }
    async getLiveRefreshInterval() {
      return null;
    }
    createEncodedPacket(suppliedPacket, duration, options) {
      let packetType;
      if (this.allPacketsAreKeyPackets()) {
        packetType = "key";
      } else {
        packetType = suppliedPacket.randomAccessIndicator === 1 ? "key" : "delta";
      }
      return new EncodedPacket(
        options.metadataOnly ? PLACEHOLDER_DATA : suppliedPacket.data,
        packetType,
        suppliedPacket.pts / TIMESCALE,
        Math.max(duration / TIMESCALE, 0),
        suppliedPacket.sequenceNumber,
        suppliedPacket.data.byteLength
      );
    }
    async getFirstPacket(options) {
      const section = this.elementaryStream.firstSection;
      assert(section);
      const pesPacket = readPesPacket(section, true);
      assert(pesPacket);
      const context = new PacketReadingContext(this.elementaryStream, pesPacket);
      const buffer = new PacketBuffer(this, context);
      const result = await buffer.readNext();
      if (!result) {
        return null;
      }
      const packet = this.createEncodedPacket(result.packet, result.duration, options);
      this.packetBuffers.set(packet, buffer);
      this.packetSectionStarts.set(packet, result.packet.sectionStartPos);
      return packet;
    }
    async getNextPacket(packet, options) {
      let buffer = this.packetBuffers.get(packet);
      if (buffer) {
        const result = await buffer.readNext();
        if (!result) {
          return null;
        }
        this.packetBuffers.delete(packet);
        const newPacket = this.createEncodedPacket(result.packet, result.duration, options);
        this.packetBuffers.set(newPacket, buffer);
        this.packetSectionStarts.set(newPacket, result.packet.sectionStartPos);
        return newPacket;
      }
      const sectionStartPos = this.packetSectionStarts.get(packet);
      if (sectionStartPos === void 0) {
        throw new Error("Packet was not created from this track.");
      }
      const demuxer = this.elementaryStream.demuxer;
      const section = await demuxer.readSection(sectionStartPos, true);
      assert(section);
      const pesPacket = readPesPacket(section, true);
      assert(pesPacket);
      const context = new PacketReadingContext(this.elementaryStream, pesPacket);
      buffer = new PacketBuffer(this, context);
      const targetSequenceNumber = packet.sequenceNumber;
      while (true) {
        const result = await buffer.readNext();
        if (!result) {
          return null;
        }
        if (result.packet.sequenceNumber > targetSequenceNumber) {
          const newPacket = this.createEncodedPacket(result.packet, result.duration, options);
          this.packetBuffers.set(newPacket, buffer);
          this.packetSectionStarts.set(newPacket, result.packet.sectionStartPos);
          return newPacket;
        }
      }
    }
    async getNextKeyPacket(packet, options) {
      let currentPacket = packet;
      while (true) {
        currentPacket = await this.getNextPacket(currentPacket, options);
        if (!currentPacket) {
          return null;
        }
        if (currentPacket.type === "key") {
          return currentPacket;
        }
      }
    }
    getPacket(timestamp, options) {
      return this.doPacketLookup(timestamp, false, options);
    }
    getKeyPacket(timestamp, options) {
      return this.doPacketLookup(timestamp, true, options);
    }
    /**
     * Searches for the packet with the largest timestamp not larger than `timestamp` in the file, using a combination
     * of chunk-based binary search and linear refinement. The reason the coarse search is done in large chunks is to
     * make it more performant for small files and over high-latency readers such as the network.
     */
    async doPacketLookup(timestamp, keyframesOnly, options) {
      const searchPts = roundIfAlmostInteger(timestamp * TIMESCALE);
      const demuxer = this.elementaryStream.demuxer;
      const { reader, seekChunkSize } = demuxer;
      const pid = this.elementaryStream.pid;
      const findFirstPesPacketHeaderInChunk = async (startPos, endPos, readSectionInFull) => {
        let currentPos = startPos;
        while (currentPos < endPos) {
          const packetHeader = await demuxer.readPacketHeader(currentPos);
          if (!packetHeader) {
            return null;
          }
          if (packetHeader.pid === pid && packetHeader.payloadUnitStartIndicator === 1) {
            const section = await demuxer.readSection(currentPos, readSectionInFull);
            if (!section) {
              return null;
            }
            const pesPacketHeader = readPesPacketHeader(section, false);
            if (pesPacketHeader && pesPacketHeader.pts !== null) {
              return {
                pesPacketHeader,
                section
              };
            }
          }
          currentPos += demuxer.packetStride;
        }
        return null;
      };
      const firstSection = this.elementaryStream.firstSection;
      assert(firstSection);
      const firstPesPacketHeader = readPesPacketHeader(firstSection, true);
      assert(firstPesPacketHeader);
      if (searchPts < firstPesPacketHeader.pts) {
        return null;
      }
      let scanStartPos;
      const referencePesPackets = this.elementaryStream.referencePesPackets;
      const referencePointIndex = binarySearchLessOrEqual(referencePesPackets, searchPts, (x) => x.pts);
      const referencePoint = referencePointIndex !== -1 ? referencePesPackets[referencePointIndex] : null;
      if (referencePoint && searchPts - referencePoint.pts < TIMESCALE / 2) {
        scanStartPos = referencePoint.sectionStartPos;
      } else {
        let startChunkIndex = 0;
        if (reader.fileSize !== null) {
          const numChunks = Math.ceil(reader.fileSize / seekChunkSize);
          if (numChunks > 1) {
            let low = 0;
            let high = numChunks - 1;
            startChunkIndex = low;
            while (low <= high) {
              const mid = Math.floor((low + high) / 2);
              const chunkStartPos = floorToMultiple(mid * seekChunkSize, demuxer.packetStride) + firstPesPacketHeader.sectionStartPos;
              const chunkEndPos = chunkStartPos + seekChunkSize;
              const result2 = await findFirstPesPacketHeaderInChunk(chunkStartPos, chunkEndPos, false);
              if (!result2) {
                high = mid - 1;
                continue;
              }
              if (result2.pesPacketHeader.pts <= searchPts) {
                startChunkIndex = mid;
                low = mid + 1;
              } else {
                high = mid - 1;
              }
            }
          }
        }
        scanStartPos = floorToMultiple(
          startChunkIndex * seekChunkSize,
          demuxer.packetStride
        ) + firstPesPacketHeader.sectionStartPos;
      }
      const result = await findFirstPesPacketHeaderInChunk(
        scanStartPos,
        reader.fileSize ?? Infinity,
        false
      );
      let currentPesHeader = result?.pesPacketHeader ?? null;
      if (!currentPesHeader) {
        currentPesHeader = firstPesPacketHeader;
      }
      const reorderSize = this.getReorderSize();
      const retrieveEncodedPacket = async (sectionStartPos, predicate) => {
        const section = await demuxer.readSection(sectionStartPos, true);
        assert(section);
        const pesPacket = readPesPacket(section, true);
        assert(pesPacket);
        const context = new PacketReadingContext(this.elementaryStream, pesPacket);
        const buffer = new PacketBuffer(this, context);
        while (true) {
          const topPts = last(buffer.presentationOrderPackets)?.pts ?? -Infinity;
          if (topPts >= searchPts) {
            break;
          }
          const didRead = await buffer.readNextPacket();
          if (!didRead) {
            break;
          }
        }
        const targetIndex = findLastIndex(buffer.presentationOrderPackets, predicate);
        if (targetIndex === -1) {
          return null;
        }
        const targetPacket = buffer.presentationOrderPackets[targetIndex];
        const lastDuration = targetIndex === 0 ? 0 : targetPacket.pts - buffer.presentationOrderPackets[targetIndex - 1].pts;
        while (buffer.decodeOrderPackets[0] !== targetPacket) {
          buffer.decodeOrderPackets.shift();
        }
        buffer.lastDuration = lastDuration;
        const result2 = await buffer.readNext();
        assert(result2);
        const packet = this.createEncodedPacket(result2.packet, result2.duration, options);
        this.packetBuffers.set(packet, buffer);
        this.packetSectionStarts.set(packet, result2.packet.sectionStartPos);
        return packet;
      };
      if (!keyframesOnly || this.allPacketsAreKeyPackets()) {
        outer:
          while (true) {
            let currentPos = currentPesHeader.sectionStartPos + demuxer.packetStride;
            while (true) {
              const packetHeader = await demuxer.readPacketHeader(currentPos);
              if (!packetHeader) {
                break outer;
              }
              if (packetHeader.pid === pid && packetHeader.payloadUnitStartIndicator === 1) {
                const section = await demuxer.readSection(currentPos, false);
                if (section) {
                  const nextPesHeader = readPesPacketHeader(section, false);
                  if (nextPesHeader && nextPesHeader.pts !== null) {
                    if (nextPesHeader.pts > searchPts) {
                      break outer;
                    }
                    currentPesHeader = nextPesHeader;
                    maybeInsertReferencePacket(this.elementaryStream, currentPesHeader);
                    break;
                  }
                }
              }
              currentPos += demuxer.packetStride;
            }
          }
        outer:
          for (let i = 0; i < reorderSize + 1; i++) {
            let pos = currentPesHeader.sectionStartPos - demuxer.packetStride;
            while (pos >= demuxer.packetOffset) {
              const packetHeader = await demuxer.readPacketHeader(pos);
              if (!packetHeader) {
                break outer;
              }
              if (packetHeader.pid === pid && packetHeader.payloadUnitStartIndicator === 1) {
                const section = await demuxer.readSection(pos, false);
                if (section) {
                  const header = readPesPacketHeader(section, false);
                  if (header && header.pts !== null) {
                    currentPesHeader = header;
                    break;
                  }
                }
              }
              pos -= demuxer.packetStride;
            }
          }
        return retrieveEncodedPacket(currentPesHeader.sectionStartPos, (p) => p.pts <= searchPts);
      } else {
        let currentChunkStartPos = scanStartPos;
        let nextChunkStartPos = null;
        const readSectionsInFull = !this.elementaryStream.canBeTrustedWithKeyPackets;
        while (true) {
          let bestKeyPesHeader = null;
          const isFirstChunk = currentChunkStartPos <= firstPesPacketHeader.sectionStartPos;
          let pesHeader;
          let pesHeaderSection = null;
          if (isFirstChunk) {
            pesHeader = firstPesPacketHeader;
            pesHeaderSection = firstSection;
          } else {
            const result2 = await findFirstPesPacketHeaderInChunk(
              currentChunkStartPos,
              reader.fileSize ?? Infinity,
              readSectionsInFull
            );
            pesHeader = result2?.pesPacketHeader ?? null;
            pesHeaderSection = result2?.section ?? null;
          }
          let passedSearchPts = false;
          let lookaheadCount = 0;
          outer:
            while (pesHeader) {
              if (nextChunkStartPos !== null && pesHeader.sectionStartPos >= nextChunkStartPos) {
                break;
              }
              if (pesHeader.pts <= searchPts) {
                let isKeyPacket;
                if (this.elementaryStream.canBeTrustedWithKeyPackets) {
                  isKeyPacket = pesHeader.randomAccessIndicator === 1;
                } else {
                  assert(pesHeaderSection);
                  const pesPacket = readPesPacket(pesHeaderSection, true);
                  assert(pesPacket);
                  const context = new PacketReadingContext(this.elementaryStream, pesPacket);
                  await context.markNextPacket();
                  isKeyPacket = context.suppliedPacket?.randomAccessIndicator === 1;
                }
                if (isKeyPacket) {
                  bestKeyPesHeader = pesHeader;
                }
              }
              if (pesHeader.pts > searchPts) {
                passedSearchPts = true;
              }
              if (passedSearchPts) {
                lookaheadCount++;
                if (lookaheadCount > reorderSize) {
                  break;
                }
              }
              let currentPos = pesHeader.sectionStartPos + demuxer.packetStride;
              while (true) {
                const packetHeader = await demuxer.readPacketHeader(currentPos);
                if (!packetHeader) {
                  break outer;
                }
                if (packetHeader.pid === pid && packetHeader.payloadUnitStartIndicator === 1) {
                  const section = await demuxer.readSection(currentPos, readSectionsInFull);
                  if (section) {
                    const nextPesHeader = readPesPacketHeader(section, false);
                    if (nextPesHeader && nextPesHeader.pts !== null) {
                      pesHeader = nextPesHeader;
                      pesHeaderSection = section;
                      maybeInsertReferencePacket(this.elementaryStream, pesHeader);
                      break;
                    }
                  }
                }
                currentPos += demuxer.packetStride;
              }
            }
          if (bestKeyPesHeader) {
            let startPesHeader = bestKeyPesHeader;
            if (lookaheadCount === 0) {
              outer:
                for (let i = 0; i < reorderSize; i++) {
                  let pos = startPesHeader.sectionStartPos - demuxer.packetStride;
                  while (pos >= demuxer.packetOffset) {
                    const packetHeader = await demuxer.readPacketHeader(pos);
                    if (!packetHeader) {
                      break outer;
                    }
                    if (packetHeader.pid === pid && packetHeader.payloadUnitStartIndicator === 1) {
                      const section = await demuxer.readSection(pos, readSectionsInFull);
                      if (section) {
                        const header = readPesPacketHeader(section, false);
                        if (header && header.pts !== null) {
                          startPesHeader = header;
                          break;
                        }
                      }
                    }
                    pos -= demuxer.packetStride;
                  }
                }
            }
            const encodedPacket = await retrieveEncodedPacket(
              startPesHeader.sectionStartPos,
              (p) => p.pts <= searchPts && p.randomAccessIndicator === 1
            );
            assert(encodedPacket);
            return encodedPacket;
          }
          if (isFirstChunk) {
            return null;
          }
          nextChunkStartPos = currentChunkStartPos;
          currentChunkStartPos = Math.max(
            floorToMultiple(
              currentChunkStartPos - firstPesPacketHeader.sectionStartPos - seekChunkSize,
              demuxer.packetStride
            ) + firstPesPacketHeader.sectionStartPos,
            firstPesPacketHeader.sectionStartPos
          );
        }
      }
    }
  };
  var MpegTsVideoTrackBacking = class extends MpegTsTrackBacking {
    getType() {
      return "video";
    }
    getCodec() {
      return this.elementaryStream.info.codec;
    }
    getCodedWidth() {
      return this.elementaryStream.info.width;
    }
    getCodedHeight() {
      return this.elementaryStream.info.height;
    }
    getSquarePixelWidth() {
      return this.elementaryStream.info.squarePixelWidth;
    }
    getSquarePixelHeight() {
      return this.elementaryStream.info.squarePixelHeight;
    }
    getRotation() {
      return 0;
    }
    async getColorSpace() {
      return this.elementaryStream.info.colorSpace;
    }
    async canBeTransparent() {
      return false;
    }
    async getDecoderConfig() {
      assert(this.elementaryStream.info.decoderConfig);
      return this.elementaryStream.info.decoderConfig;
    }
    allPacketsAreKeyPackets() {
      return false;
    }
    getReorderSize() {
      return this.elementaryStream.info.reorderSize;
    }
  };
  var MpegTsAudioTrackBacking = class extends MpegTsTrackBacking {
    getType() {
      return "audio";
    }
    getCodec() {
      return this.elementaryStream.info.codec;
    }
    getNumberOfChannels() {
      return this.elementaryStream.info.numberOfChannels;
    }
    getSampleRate() {
      return this.elementaryStream.info.sampleRate;
    }
    async getDecoderConfig() {
      assert(this.elementaryStream.info.decoderConfig);
      return this.elementaryStream.info.decoderConfig;
    }
    allPacketsAreKeyPackets() {
      return true;
    }
    getReorderSize() {
      return 0;
    }
  };
  var maybeInsertReferencePacket = (elementaryStream, pesPacketHeader) => {
    const referencePesPackets = elementaryStream.referencePesPackets;
    const index = binarySearchLessOrEqual(
      referencePesPackets,
      pesPacketHeader.sectionStartPos,
      (x) => x.sectionStartPos
    );
    if (index >= 0) {
      const entry = referencePesPackets[index];
      if (pesPacketHeader.pts <= entry.pts) {
        return false;
      }
      const minByteDistance = elementaryStream.demuxer.minReferencePointByteDistance;
      if (pesPacketHeader.sectionStartPos - entry.sectionStartPos < minByteDistance) {
        return false;
      }
      if (index < referencePesPackets.length - 1) {
        const nextEntry = referencePesPackets[index + 1];
        if (nextEntry.pts < pesPacketHeader.pts) {
          return false;
        }
        if (nextEntry.sectionStartPos - pesPacketHeader.sectionStartPos < minByteDistance) {
          return false;
        }
      }
    }
    referencePesPackets.splice(index + 1, 0, pesPacketHeader);
    return true;
  };
  var PacketReadingContext = class {
    constructor(elementaryStream, startingPesPacket) {
      this.currentPos = 0;
      // Relative to the data in startingPesPacket
      this.pesPackets = [];
      this.currentPesPacketIndex = 0;
      this.currentPesPacketPos = 0;
      this.endPos = 0;
      this.lastSuppliedPesPacket = null;
      this.nextPts = null;
      this.suppliedPacket = null;
      this.elementaryStream = elementaryStream;
      this.pid = elementaryStream.pid;
      this.demuxer = elementaryStream.demuxer;
      this.startingPesPacket = startingPesPacket;
    }
    ensureBuffered(length) {
      const remaining = this.endPos - this.currentPos;
      if (remaining >= length) {
        return length;
      }
      return this.bufferData(length - remaining).then(() => Math.min(this.endPos - this.currentPos, length));
    }
    getCurrentPesPacket() {
      const packet = this.pesPackets[this.currentPesPacketIndex];
      assert(packet);
      return packet;
    }
    async bufferData(length) {
      const targetEndPos = this.endPos + length;
      while (this.endPos < targetEndPos) {
        let pesPacket;
        if (this.pesPackets.length === 0) {
          pesPacket = this.startingPesPacket;
        } else {
          let currentPos = last(this.pesPackets).sectionEndPos;
          assert(currentPos !== null);
          while (true) {
            const packetHeader = await this.demuxer.readPacketHeader(currentPos);
            if (!packetHeader) {
              return;
            }
            if (packetHeader.pid === this.pid) {
              const nextSection = await this.demuxer.readSection(currentPos, true);
              if (!nextSection) {
                return;
              }
              const nextPesPacket = readPesPacket(nextSection, false);
              if (nextPesPacket) {
                pesPacket = nextPesPacket;
                break;
              }
            }
            currentPos += this.demuxer.packetStride;
          }
        }
        this.pesPackets.push(pesPacket);
        this.endPos += pesPacket.data.byteLength;
      }
    }
    readBytes(length) {
      const currentPesPacket = this.getCurrentPesPacket();
      const relativeStartOffset = this.currentPos - this.currentPesPacketPos;
      const relativeEndOffset = relativeStartOffset + length;
      this.currentPos += length;
      if (relativeEndOffset <= currentPesPacket.data.byteLength) {
        return currentPesPacket.data.subarray(relativeStartOffset, relativeEndOffset);
      }
      const result = new Uint8Array(length);
      result.set(currentPesPacket.data.subarray(relativeStartOffset));
      let offset = currentPesPacket.data.byteLength - relativeStartOffset;
      while (true) {
        this.advanceCurrentPacket();
        const currentPesPacket2 = this.getCurrentPesPacket();
        const relativeEndOffset2 = length - offset;
        if (relativeEndOffset2 <= currentPesPacket2.data.byteLength) {
          result.set(currentPesPacket2.data.subarray(0, relativeEndOffset2), offset);
          break;
        }
        result.set(currentPesPacket2.data, offset);
        offset += currentPesPacket2.data.byteLength;
      }
      return result;
    }
    readU8() {
      let currentPesPacket = this.getCurrentPesPacket();
      const relativeOffset = this.currentPos - this.currentPesPacketPos;
      this.currentPos++;
      if (relativeOffset < currentPesPacket.data.byteLength) {
        return currentPesPacket.data[relativeOffset];
      }
      this.advanceCurrentPacket();
      currentPesPacket = this.getCurrentPesPacket();
      return currentPesPacket.data[0];
    }
    seekTo(pos) {
      if (pos === this.currentPos) {
        return;
      }
      if (pos < this.currentPos) {
        while (pos < this.currentPesPacketPos) {
          this.currentPesPacketIndex--;
          const currentPacket = this.getCurrentPesPacket();
          this.currentPesPacketPos -= currentPacket.data.byteLength;
        }
      } else {
        while (true) {
          const currentPesPacket = this.getCurrentPesPacket();
          const currentEndPos = this.currentPesPacketPos + currentPesPacket.data.byteLength;
          if (pos < currentEndPos) {
            break;
          }
          this.currentPesPacketPos += currentPesPacket.data.byteLength;
          this.currentPesPacketIndex++;
        }
      }
      this.currentPos = pos;
    }
    skip(n) {
      this.seekTo(this.currentPos + n);
    }
    advanceCurrentPacket() {
      this.currentPesPacketPos += this.getCurrentPesPacket().data.byteLength;
      this.currentPesPacketIndex++;
    }
    async markNextPacket() {
      assert(!this.suppliedPacket);
      const elementaryStream = this.elementaryStream;
      if (elementaryStream.info.type === "video") {
        const codec = elementaryStream.info.codec;
        const CHUNK_SIZE = 1024;
        if (codec !== "avc" && codec !== "hevc") {
          throw new Error("Unhandled.");
        }
        const nalHeaderSize = codec === "avc" ? 1 : 2;
        let packetStartPos = null;
        let frameStartFound = false;
        let lastFirstMacroblockInSlice = 0;
        while (true) {
          let remaining = this.ensureBuffered(CHUNK_SIZE);
          if (remaining instanceof Promise) remaining = await remaining;
          if (remaining === 0) {
            break;
          }
          const chunkStartPos = this.currentPos;
          const chunk = this.readBytes(remaining);
          const length = chunk.byteLength;
          let i = 0;
          while (i < length) {
            const zeroIndex = chunk.indexOf(0, i);
            if (zeroIndex === -1 || zeroIndex >= length) {
              break;
            }
            i = zeroIndex;
            const posBeforeZero = chunkStartPos + i;
            if (i + 3 >= length) {
              this.seekTo(posBeforeZero);
              break;
            }
            const b1 = chunk[i + 1];
            const b2 = chunk[i + 2];
            const b3 = chunk[i + 3];
            let startCodeLength = 0;
            if (b1 === 0 && b2 === 0 && b3 === 1) {
              startCodeLength = 4;
            } else if (b1 === 0 && b2 === 1) {
              startCodeLength = 3;
            }
            if (startCodeLength === 0) {
              i++;
              continue;
            }
            const startCodePos = posBeforeZero;
            packetStartPos ??= startCodePos;
            const nalHeaderStart = i + startCodeLength;
            const payloadStart = nalHeaderStart + nalHeaderSize;
            const AVC_SLICE_HEADER_PEEK_SIZE = 6;
            const bytesNeeded = payloadStart + (codec === "avc" ? AVC_SLICE_HEADER_PEEK_SIZE : 1);
            if (bytesNeeded > length) {
              this.seekTo(posBeforeZero);
              break;
            }
            const headerByte0 = chunk[nalHeaderStart];
            let nalUnitType;
            let isSlice;
            let isAccessUnitStart;
            if (codec === "avc") {
              nalUnitType = extractNalUnitTypeForAvc(headerByte0);
              isSlice = nalUnitType === 1 /* NON_IDR_SLICE */ || nalUnitType === 2 /* SLICE_DPA */ || nalUnitType === 5 /* IDR */;
              isAccessUnitStart = nalUnitType === 6 /* SEI */ || nalUnitType === 7 /* SPS */ || nalUnitType === 8 /* PPS */ || nalUnitType === 9 /* AUD */;
            } else {
              nalUnitType = extractNalUnitTypeForHevc(headerByte0);
              const layerId = (headerByte0 & 1) << 5 | chunk[nalHeaderStart + 1] >> 3;
              if (layerId > 0) {
                i += startCodeLength;
                continue;
              }
              isSlice = nalUnitType <= 9 /* RASL_R */ || nalUnitType >= 16 /* BLA_W_LP */ && nalUnitType <= 21;
              isAccessUnitStart = nalUnitType >= 32 /* VPS_NUT */ && nalUnitType <= 37 || nalUnitType === 39 /* PREFIX_SEI_NUT */ || nalUnitType >= 41 && nalUnitType <= 44 || nalUnitType >= 48 && nalUnitType <= 55;
            }
            let isFrameBoundary = false;
            if (isSlice) {
              let startsNewPicture;
              if (codec === "avc") {
                const headerBytes = chunk.subarray(payloadStart, payloadStart + AVC_SLICE_HEADER_PEEK_SIZE);
                const firstMacroblockInSlice = readExpGolomb(new Bitstream(headerBytes));
                startsNewPicture = !frameStartFound || firstMacroblockInSlice <= lastFirstMacroblockInSlice;
                lastFirstMacroblockInSlice = firstMacroblockInSlice;
              } else {
                startsNewPicture = chunk[payloadStart] >> 7 === 1;
              }
              if (startsNewPicture) {
                if (frameStartFound) {
                  isFrameBoundary = true;
                } else {
                  frameStartFound = true;
                }
              }
            } else if (isAccessUnitStart && frameStartFound) {
              isFrameBoundary = true;
            }
            if (isFrameBoundary) {
              const packetLength = startCodePos - packetStartPos;
              this.seekTo(packetStartPos);
              return this.supplyPacket(packetLength, 0);
            }
            i += startCodeLength;
          }
          if (remaining < CHUNK_SIZE) {
            break;
          }
        }
        if (packetStartPos !== null && this.endPos > packetStartPos) {
          const packetLength = this.endPos - packetStartPos;
          this.seekTo(packetStartPos);
          return this.supplyPacket(packetLength, 0);
        }
      } else {
        const codec = elementaryStream.info.codec;
        const CHUNK_SIZE = 128;
        while (true) {
          let remaining = this.ensureBuffered(CHUNK_SIZE);
          if (remaining instanceof Promise) remaining = await remaining;
          const startPos = this.currentPos;
          while (this.currentPos - startPos < remaining) {
            const byte = this.readU8();
            if (codec === "aac") {
              if (byte !== 255) {
                continue;
              }
              this.skip(-1);
              const possibleHeaderStartPos = this.currentPos;
              let remaining2 = this.ensureBuffered(MAX_ADTS_FRAME_HEADER_SIZE);
              if (remaining2 instanceof Promise) remaining2 = await remaining2;
              if (remaining2 < MAX_ADTS_FRAME_HEADER_SIZE) {
                return;
              }
              const headerBytes = this.readBytes(MAX_ADTS_FRAME_HEADER_SIZE);
              const header = readAdtsFrameHeader(FileSlice4.tempFromBytes(headerBytes));
              if (header) {
                this.seekTo(possibleHeaderStartPos);
                let remaining3 = this.ensureBuffered(header.frameLength);
                if (remaining3 instanceof Promise) remaining3 = await remaining3;
                return this.supplyPacket(
                  remaining3,
                  Math.round(SAMPLES_PER_AAC_FRAME * TIMESCALE / elementaryStream.info.sampleRate)
                );
              } else {
                this.seekTo(possibleHeaderStartPos + 1);
              }
            } else if (codec === "mp3") {
              if (byte !== 255) {
                continue;
              }
              this.skip(-1);
              const possibleHeaderStartPos = this.currentPos;
              let remaining2 = this.ensureBuffered(MP3_FRAME_HEADER_SIZE);
              if (remaining2 instanceof Promise) remaining2 = await remaining2;
              if (remaining2 < MP3_FRAME_HEADER_SIZE) {
                return;
              }
              const headerBytes = this.readBytes(MP3_FRAME_HEADER_SIZE);
              const word = toDataView(headerBytes).getUint32(0);
              const result = readMp3FrameHeader(word, null);
              if (result.header) {
                this.seekTo(possibleHeaderStartPos);
                let remaining3 = this.ensureBuffered(result.header.totalSize);
                if (remaining3 instanceof Promise) remaining3 = await remaining3;
                const duration = result.header.audioSamplesInFrame * TIMESCALE / elementaryStream.info.sampleRate;
                return this.supplyPacket(remaining3, Math.round(duration));
              } else {
                this.seekTo(possibleHeaderStartPos + 1);
              }
            } else if (codec === "ac3") {
              if (byte !== 11) {
                continue;
              }
              this.skip(-1);
              const possibleSyncPos = this.currentPos;
              let remaining2 = this.ensureBuffered(5);
              if (remaining2 instanceof Promise) remaining2 = await remaining2;
              if (remaining2 < 5) {
                return;
              }
              const headerBytes = this.readBytes(5);
              if (headerBytes[0] !== 11 || headerBytes[1] !== 119) {
                this.seekTo(possibleSyncPos + 1);
                continue;
              }
              const fscod = headerBytes[4] >> 6;
              const frmsizecod = headerBytes[4] & 63;
              if (fscod === 3 || frmsizecod > 37) {
                this.seekTo(possibleSyncPos + 1);
                continue;
              }
              const frameSize = AC3_FRAME_SIZES[3 * frmsizecod + fscod];
              assert(frameSize !== void 0);
              this.seekTo(possibleSyncPos);
              remaining2 = this.ensureBuffered(frameSize);
              if (remaining2 instanceof Promise) remaining2 = await remaining2;
              const duration = Math.round(
                AC3_SAMPLES_PER_FRAME * TIMESCALE / elementaryStream.info.sampleRate
              );
              return this.supplyPacket(remaining2, duration);
            } else if (codec === "eac3") {
              if (byte !== 11) {
                continue;
              }
              this.skip(-1);
              const possibleSyncPos = this.currentPos;
              let remaining2 = this.ensureBuffered(5);
              if (remaining2 instanceof Promise) remaining2 = await remaining2;
              if (remaining2 < 5) {
                return;
              }
              const headerBytes = this.readBytes(5);
              if (headerBytes[0] !== 11 || headerBytes[1] !== 119) {
                this.seekTo(possibleSyncPos + 1);
                continue;
              }
              const frmsiz = (headerBytes[2] & 7) << 8 | headerBytes[3];
              const frameSize = (frmsiz + 1) * 2;
              const fscod = headerBytes[4] >> 6;
              const numblkscod = fscod === 3 ? 3 : headerBytes[4] >> 4 & 3;
              const numblks = EAC3_NUMBLKS_TABLE[numblkscod];
              this.seekTo(possibleSyncPos);
              remaining2 = this.ensureBuffered(frameSize);
              if (remaining2 instanceof Promise) remaining2 = await remaining2;
              const samplesPerFrame = numblks * 256;
              const duration = Math.round(
                samplesPerFrame * TIMESCALE / elementaryStream.info.sampleRate
              );
              return this.supplyPacket(remaining2, duration);
            } else {
              throw new Error("Unhandled.");
            }
          }
          if (remaining < CHUNK_SIZE) {
            break;
          }
        }
      }
    }
    /** Supplies the context with a new encoded packet, beginning at the current position. */
    supplyPacket(packetLength, intrinsicDuration) {
      const currentPesPacket = this.getCurrentPesPacket();
      let pts;
      if (this.lastSuppliedPesPacket === currentPesPacket) {
        assert(this.nextPts !== null);
        pts = this.nextPts;
      } else {
        if (currentPesPacket.pts === null) {
          throw new Error(MISSING_PTS_ERROR_MESSAGE);
        }
        pts = currentPesPacket.pts;
        maybeInsertReferencePacket(this.elementaryStream, currentPesPacket);
      }
      this.lastSuppliedPesPacket = currentPesPacket;
      this.nextPts = pts + intrinsicDuration;
      const sectionStartPos = currentPesPacket.sectionStartPos;
      const sequenceNumber = sectionStartPos + (this.currentPos - this.currentPesPacketPos);
      const data = this.readBytes(packetLength);
      let randomAccessIndicator = currentPesPacket.randomAccessIndicator;
      if (randomAccessIndicator === 0 && !this.elementaryStream.canBeTrustedWithKeyPackets) {
        if (this.elementaryStream.info.type === "audio") {
          randomAccessIndicator = 1;
        } else {
          if (this.elementaryStream.info.decoderConfig) {
            const isKey = determineVideoPacketType(
              this.elementaryStream.info.codec,
              this.elementaryStream.info.decoderConfig,
              data
            ) === "key";
            randomAccessIndicator = Number(isKey);
          } else {
          }
        }
      }
      this.suppliedPacket = {
        pts,
        data,
        sequenceNumber,
        sectionStartPos,
        randomAccessIndicator
      };
      this.pesPackets.splice(0, this.currentPesPacketIndex);
      this.currentPesPacketIndex = 0;
    }
  };
  var PacketBuffer = class {
    constructor(backing, context) {
      this.decodeOrderPackets = [];
      this.reorderBuffer = [];
      this.presentationOrderPackets = [];
      this.reachedEnd = false;
      this.lastDuration = 0;
      this.backing = backing;
      this.context = context;
      this.reorderSize = backing.getReorderSize();
      assert(this.reorderSize >= 0);
    }
    async readNext() {
      if (this.decodeOrderPackets.length === 0) {
        const didRead = await this.readNextPacket();
        if (!didRead) {
          return null;
        }
      }
      await this.ensureCurrentPacketHasNext();
      const packet = this.decodeOrderPackets[0];
      const presentationIndex = this.presentationOrderPackets.indexOf(packet);
      assert(presentationIndex !== -1);
      let duration;
      if (presentationIndex === this.presentationOrderPackets.length - 1) {
        duration = this.lastDuration;
      } else {
        const nextPacket = this.presentationOrderPackets[presentationIndex + 1];
        duration = nextPacket.pts - packet.pts;
        this.lastDuration = duration;
      }
      this.decodeOrderPackets.shift();
      while (this.presentationOrderPackets.length > 0) {
        const first = this.presentationOrderPackets[0];
        if (this.decodeOrderPackets.includes(first)) {
          break;
        }
        this.presentationOrderPackets.shift();
      }
      return { packet, duration };
    }
    async readNextPacket() {
      if (this.reachedEnd) {
        return false;
      }
      let suppliedPacket;
      if (this.context.suppliedPacket) {
        suppliedPacket = this.context.suppliedPacket;
      } else {
        await this.context.markNextPacket();
        suppliedPacket = this.context.suppliedPacket;
      }
      this.context.suppliedPacket = null;
      if (!suppliedPacket) {
        this.reachedEnd = true;
        this.flushReorderBuffer();
        return false;
      }
      this.decodeOrderPackets.push(suppliedPacket);
      this.processPacketThroughReorderBuffer(suppliedPacket);
      return true;
    }
    async ensureCurrentPacketHasNext() {
      const current = this.decodeOrderPackets[0];
      assert(current);
      while (true) {
        const presentationIndex = this.presentationOrderPackets.indexOf(current);
        if (presentationIndex !== -1 && presentationIndex <= this.presentationOrderPackets.length - 2) {
          break;
        }
        const didRead = await this.readNextPacket();
        if (!didRead) {
          break;
        }
      }
    }
    processPacketThroughReorderBuffer(packet) {
      this.reorderBuffer.push(packet);
      if (this.reorderBuffer.length > this.reorderSize) {
        let minIndex = 0;
        for (let i = 1; i < this.reorderBuffer.length; i++) {
          if (this.reorderBuffer[i].pts < this.reorderBuffer[minIndex].pts) {
            minIndex = i;
          }
        }
        const packet2 = this.reorderBuffer[minIndex];
        this.presentationOrderPackets.push(packet2);
        this.reorderBuffer.splice(minIndex, 1);
      }
    }
    flushReorderBuffer() {
      this.reorderBuffer.sort((a, b) => a.pts - b.pts);
      this.presentationOrderPackets.push(...this.reorderBuffer);
      this.reorderBuffer.length = 0;
    }
  };

  // src/hls/hls-misc.ts
  var HLS_MIME_TYPE = "application/vnd.apple.mpegurl";
  var TAG_STREAM_INF = "#EXT-X-STREAM-INF:";
  var TAG_I_FRAME_STREAM_INF = "#EXT-X-I-FRAME-STREAM-INF:";
  var TAG_MEDIA = "#EXT-X-MEDIA:";
  var TAG_EXTINF = "#EXTINF:";
  var TAG_MAP = "#EXT-X-MAP:";
  var TAG_KEY = "#EXT-X-KEY:";
  var TAG_MEDIA_SEQUENCE = "#EXT-X-MEDIA-SEQUENCE:";
  var TAG_BYTERANGE = "#EXT-X-BYTERANGE:";
  var TAG_PROGRAM_DATE_TIME = "#EXT-X-PROGRAM-DATE-TIME:";
  var TAG_DISCONTINUITY = "#EXT-X-DISCONTINUITY";
  var TAG_TARGETDURATION = "#EXT-X-TARGETDURATION:";
  var TAG_ENDLIST = "#EXT-X-ENDLIST";
  var TAG_PLAYLIST_TYPE = "#EXT-X-PLAYLIST-TYPE:";
  var TAG_I_FRAMES_ONLY = "#EXT-X-I-FRAMES-ONLY";
  var canIgnoreLine = (line) => line.length === 0 || line.startsWith("#") && !line.startsWith("#EXT");
  var AttributeList = class {
    constructor(str) {
      this._attributes = {};
      let key = "";
      let value = "";
      let inValue = false;
      let inQuotes = false;
      for (let i = 0; i < str.length; i++) {
        const char = str[i];
        if (char === '"') {
          inQuotes = !inQuotes;
        } else if (char === "=" && !inValue && !inQuotes) {
          inValue = true;
        } else if (char === "," && !inQuotes) {
          if (key) {
            this._attributes[key.trim().toLowerCase()] = value;
          }
          key = "";
          value = "";
          inValue = false;
        } else if (inValue) {
          value += char;
        } else {
          key += char;
        }
      }
      if (key) {
        this._attributes[key.trim().toLowerCase()] = value;
      }
    }
    get(name) {
      return this._attributes[name.toLowerCase()] ?? null;
    }
    getAsNumber(name) {
      const value = this.get(name);
      if (value === null) {
        return null;
      }
      const num = Number(value);
      return Number.isFinite(num) ? num : null;
    }
    merge(other) {
      Object.assign(this._attributes, other._attributes);
    }
  };

  // src/segmented-input.ts
  var SegmentedInput = class {
    constructor(input, path, trackDeclarations) {
      this.nextInputCacheAge = 0;
      this.inputCache = [];
      this.trackBackingsPromise = null;
      this.firstSegment = null;
      this.firstSegmentFirstTimestamps = /* @__PURE__ */ new WeakMap();
      this.firstTimestampCache = /* @__PURE__ */ new WeakMap();
      this.input = input;
      this.path = path;
      this.trackDeclarations = trackDeclarations;
    }
    async getDurationFromMetadata(options) {
      const lastSegment = await this.getSegmentAt(Infinity, {
        skipLiveWait: options.skipLiveWait
      });
      if (!lastSegment) {
        return null;
      }
      return lastSegment.timestamp + lastSegment.duration;
    }
    async getUnixTimeForTimestamp(timestamp) {
      let segment = await this.getSegmentAt(timestamp, {});
      segment ??= await this.getFirstSegment({});
      if (!segment || segment.unixEpochTimestamp === null) {
        return null;
      }
      const elapsed = timestamp - segment.timestamp;
      return segment.unixEpochTimestamp + elapsed;
    }
    async getTrackBackings() {
      return this.trackBackingsPromise ??= (async () => {
        const backings = [];
        if (this.trackDeclarations) {
          for (const decl of this.trackDeclarations) {
            if (decl.type === "video") {
              const number = arrayCount(backings, (x) => x.getType() === "video") + 1;
              backings.push(
                new SegmentedInputInputVideoTrackBacking(this, decl, number)
              );
            } else if (decl.type === "audio") {
              const number = arrayCount(backings, (x) => x.getType() === "audio") + 1;
              backings.push(
                new SegmentedInputInputAudioTrackBacking(this, decl, number)
              );
            }
          }
        } else {
          this.firstSegment = await this.getFirstSegment({});
          if (!this.firstSegment) {
            return [];
          }
          const input = this.getInputForSegment(this.firstSegment);
          const inputTracks = await input.getTracks();
          for (const track of inputTracks) {
            if (track.type === "video") {
              const number = arrayCount(backings, (x) => x.getType() === "video") + 1;
              backings.push(
                new SegmentedInputInputVideoTrackBacking(this, {
                  id: backings.length + 1,
                  type: "video"
                }, number)
              );
            } else if (track.type === "audio") {
              const number = arrayCount(backings, (x) => x.getType() === "audio") + 1;
              backings.push(
                new SegmentedInputInputAudioTrackBacking(this, {
                  id: backings.length + 1,
                  type: "audio"
                }, number)
              );
            }
          }
        }
        return backings;
      })();
    }
    // This operation is done a lot and can be semi-expensive, so it's good to have a cache for it
    async getFirstTimestampForInput(input) {
      const existing = this.firstTimestampCache.get(input);
      if (existing !== void 0) {
        return existing;
      }
      const firstTimestamp = await input.getFirstTimestamp();
      this.firstTimestampCache.set(input, firstTimestamp);
      return firstTimestamp;
    }
    async getMediaOffset(segment, input) {
      const firstSegment = segment.firstSegment ?? segment;
      let firstSegmentFirstTimestamp;
      if (this.firstSegmentFirstTimestamps.has(firstSegment)) {
        firstSegmentFirstTimestamp = this.firstSegmentFirstTimestamps.get(firstSegment);
      } else {
        const firstInput = this.getInputForSegment(firstSegment);
        firstSegmentFirstTimestamp = await this.getFirstTimestampForInput(firstInput);
        this.firstSegmentFirstTimestamps.set(firstSegment, firstSegmentFirstTimestamp);
      }
      if (firstSegment === segment) {
        return firstSegment.timestamp - firstSegmentFirstTimestamp;
      }
      const segmentFirstTimestamp = await this.getFirstTimestampForInput(input);
      const segmentElapsed = segment.timestamp - firstSegment.timestamp;
      const inputElapsed = segmentFirstTimestamp - firstSegmentFirstTimestamp;
      const difference = inputElapsed - segmentElapsed;
      if (Math.abs(difference) <= Math.min(0.25, segmentElapsed)) {
        return firstSegment.timestamp - firstSegmentFirstTimestamp;
      } else {
        return segment.timestamp - segmentFirstTimestamp;
      }
    }
    dispose() {
      for (const entry of this.inputCache) {
        entry.input.dispose();
      }
      this.inputCache.length = 0;
    }
  };
  var SegmentedInputInputTrackBacking = class {
    constructor(segmentedInput, decl, number) {
      this.packetInfos = /* @__PURE__ */ new WeakMap();
      this.hydrationPromise = null;
      this.firstInputTrack = null;
      this.firstSegment = null;
      this.segmentedInput = segmentedInput;
      this.decl = decl;
      this.number = number;
    }
    hydrate() {
      return this.hydrationPromise ??= (async () => {
        this.segmentedInput.firstSegment ??= await this.segmentedInput.getFirstSegment({});
        if (!this.segmentedInput.firstSegment) {
          throw new Error("Missing first segment, can't retrieve track.");
        }
        let currentSegment = this.segmentedInput.firstSegment;
        let track = null;
        while (currentSegment) {
          const input = this.segmentedInput.getInputForSegment(currentSegment);
          const inputTracks = await input.getTracks();
          track = inputTracks.find((x) => x.type === this.decl.type && x.number === this.number) ?? null;
          if (track) {
            break;
          }
          currentSegment = await this.segmentedInput.getNextSegment(currentSegment, {});
        }
        if (!track) {
          throw new Error("No matching track found in underlying media data.");
        }
        this.firstInputTrack = track;
        this.firstSegment = currentSegment;
      })();
    }
    getId() {
      return this.decl.id;
    }
    getType() {
      return this.decl.type;
    }
    getNumber() {
      return this.number;
    }
    /** If the backing track is already present, delegate synchronously; otherwise, hydrate first. */
    delegate(fn) {
      if (this.firstInputTrack) {
        return fn();
      }
      return this.hydrate().then(fn);
    }
    async getDecoderConfig() {
      return this.delegate(() => this.firstInputTrack._backing.getDecoderConfig());
    }
    getHasOnlyKeyPackets() {
      return this.delegate(() => this.firstInputTrack._backing.getHasOnlyKeyPackets?.() ?? null);
    }
    getPairingMask() {
      return 1n;
    }
    getCodec() {
      return this.delegate(() => this.firstInputTrack._backing.getCodec());
    }
    getInternalCodecId() {
      return this.delegate(() => this.firstInputTrack._backing.getInternalCodecId());
    }
    getDisposition() {
      return this.delegate(() => this.firstInputTrack._backing.getDisposition());
    }
    getLanguageCode() {
      return this.delegate(() => this.firstInputTrack._backing.getLanguageCode());
    }
    getName() {
      return this.delegate(() => this.firstInputTrack._backing.getName());
    }
    getTimeResolution() {
      return this.delegate(() => this.firstInputTrack._backing.getTimeResolution());
    }
    async isRelativeToUnixEpoch() {
      await this.hydrate();
      assert(this.segmentedInput.firstSegment);
      return this.segmentedInput.firstSegment.unixEpochTimestamp === this.segmentedInput.firstSegment.timestamp;
    }
    getUnixTimeForTimestamp(timestamp) {
      return this.segmentedInput.getUnixTimeForTimestamp(timestamp);
    }
    getBitrate() {
      return this.delegate(() => this.firstInputTrack._backing.getBitrate());
    }
    getAverageBitrate() {
      return this.delegate(() => this.firstInputTrack._backing.getAverageBitrate());
    }
    getDurationFromMetadata(options) {
      return this.segmentedInput.getDurationFromMetadata(options);
    }
    getLiveRefreshInterval() {
      return this.segmentedInput.getLiveRefreshInterval();
    }
    async createAdjustedPacket(packet, segment, track) {
      assert(packet.sequenceNumber >= 0);
      assert(this.segmentedInput.firstSegment);
      const mediaOffset = await this.segmentedInput.getMediaOffset(segment, track.input);
      const segmentTimestampRelativeToFirst = segment.timestamp - this.segmentedInput.firstSegment.timestamp;
      const modified = packet.clone({
        timestamp: roundToDivisor(
          packet.timestamp + mediaOffset,
          await track.getTimeResolution()
        ),
        // The 1e8 assumes a max of 100 MB per second, highly unlikely to be hit, so this should guarantee
        // monotonically increasing sequence numbers across segments.
        sequenceNumber: Math.floor(1e8 * segmentTimestampRelativeToFirst) + packet.sequenceNumber
      });
      this.packetInfos.set(modified, {
        segment,
        track,
        sourcePacket: packet
      });
      return modified;
    }
    async getFirstPacket(options) {
      await this.hydrate();
      assert(this.firstInputTrack);
      assert(this.firstSegment);
      let currentTrack = this.firstInputTrack;
      let currentSegment = this.firstSegment;
      while (true) {
        if (currentTrack) {
          const packet = await currentTrack._backing.getFirstPacket(options);
          if (packet) {
            return this.createAdjustedPacket(packet, currentSegment, currentTrack);
          }
        }
        currentSegment = await this.segmentedInput.getNextSegment(currentSegment, {
          skipLiveWait: options.skipLiveWait
        });
        if (!currentSegment) {
          break;
        }
        const nextInput = this.segmentedInput.getInputForSegment(currentSegment);
        const nextTracks = await nextInput.getTracks();
        currentTrack = nextTracks.find((t) => t.type === this.firstInputTrack.type && t.number === this.firstInputTrack.number) ?? null;
      }
      return null;
    }
    getNextPacket(packet, options) {
      return this._getNextInternal(packet, options, false);
    }
    getNextKeyPacket(packet, options) {
      return this._getNextInternal(packet, options, true);
    }
    async _getNextInternal(packet, options, keyframesOnly) {
      const info = this.packetInfos.get(packet);
      if (!info) {
        throw new Error("Packet was not created from this track.");
      }
      const nextPacket = keyframesOnly ? await info.track._backing.getNextKeyPacket(info.sourcePacket, options) : await info.track._backing.getNextPacket(info.sourcePacket, options);
      if (nextPacket) {
        return this.createAdjustedPacket(nextPacket, info.segment, info.track);
      }
      let currentSegment = info.segment;
      while (true) {
        const nextSegment = await this.segmentedInput.getNextSegment(currentSegment, {
          skipLiveWait: options.skipLiveWait
        });
        if (!nextSegment) {
          return null;
        }
        const nextInput = this.segmentedInput.getInputForSegment(nextSegment);
        const nextTracks = await nextInput.getTracks();
        const nextTrack = nextTracks.find((t) => t.type === info.track.type && t.number === info.track.number);
        if (!nextTrack) {
          currentSegment = nextSegment;
          continue;
        }
        const firstPacket = await nextTrack._backing.getFirstPacket(options);
        if (!firstPacket) {
          return null;
        }
        return this.createAdjustedPacket(firstPacket, nextSegment, nextTrack);
      }
    }
    getPacket(timestamp, options) {
      return this._getPacketInternal(timestamp, options, false);
    }
    getKeyPacket(timestamp, options) {
      return this._getPacketInternal(timestamp, options, true);
    }
    async _getPacketInternal(timestamp, options, keyframesOnly) {
      let currentSegment = await this.segmentedInput.getSegmentAt(timestamp, {
        skipLiveWait: options.skipLiveWait
      });
      if (!currentSegment) {
        return null;
      }
      await this.hydrate();
      while (currentSegment) {
        const input = this.segmentedInput.getInputForSegment(currentSegment);
        const tracks = await input.getTracks();
        const track = tracks.find((t) => t.type === this.firstInputTrack.type && t.number === this.firstInputTrack.number);
        if (!track) {
          currentSegment = await this.segmentedInput.getPreviousSegment(currentSegment, {
            skipLiveWait: options.skipLiveWait
          });
          continue;
        }
        const mediaOffset = await this.segmentedInput.getMediaOffset(currentSegment, input);
        const offsetTimestamp = timestamp - mediaOffset;
        const packet = keyframesOnly ? await track._backing.getKeyPacket(offsetTimestamp, options) : await track._backing.getPacket(offsetTimestamp, options);
        if (!packet) {
          currentSegment = await this.segmentedInput.getPreviousSegment(currentSegment, {
            skipLiveWait: options.skipLiveWait
          });
          continue;
        }
        return this.createAdjustedPacket(packet, currentSegment, track);
      }
      return null;
    }
  };
  var SegmentedInputInputVideoTrackBacking = class extends SegmentedInputInputTrackBacking {
    getType() {
      return "video";
    }
    getCodec() {
      return this.delegate(() => this.firstInputTrack._backing.getCodec());
    }
    getCodedWidth() {
      return this.delegate(() => this.firstInputTrack._backing.getCodedWidth());
    }
    getCodedHeight() {
      return this.delegate(() => this.firstInputTrack._backing.getCodedHeight());
    }
    getSquarePixelWidth() {
      return this.delegate(() => this.firstInputTrack._backing.getSquarePixelWidth());
    }
    getSquarePixelHeight() {
      return this.delegate(() => this.firstInputTrack._backing.getSquarePixelHeight());
    }
    getRotation() {
      return this.delegate(() => this.firstInputTrack._backing.getRotation());
    }
    async getColorSpace() {
      return this.delegate(() => this.firstInputTrack._backing.getColorSpace());
    }
    async canBeTransparent() {
      return this.delegate(() => this.firstInputTrack._backing.canBeTransparent());
    }
    async getDecoderConfig() {
      return this.delegate(() => this.firstInputTrack._backing.getDecoderConfig());
    }
  };
  var SegmentedInputInputAudioTrackBacking = class extends SegmentedInputInputTrackBacking {
    getType() {
      return "audio";
    }
    getCodec() {
      return this.delegate(() => this.firstInputTrack._backing.getCodec());
    }
    getNumberOfChannels() {
      return this.delegate(() => this.firstInputTrack._backing.getNumberOfChannels());
    }
    getSampleRate() {
      return this.delegate(() => this.firstInputTrack._backing.getSampleRate());
    }
    async getDecoderConfig() {
      return this.delegate(() => this.firstInputTrack._backing.getDecoderConfig());
    }
  };

  // src/source.ts
  var nodeAlias = __toESM(require_node(), 1);
  polyfillSymbolDispose();
  var node = typeof nodeAlias !== "undefined" ? nodeAlias : void 0;
  var DEFAULT_MIN_READ_POSITION = 0;
  var DEFAULT_MAX_READ_POSITION = Infinity;
  var sourceFinalizationRegistry = null;
  if (typeof FinalizationRegistry !== "undefined") {
    sourceFinalizationRegistry = new FinalizationRegistry((cleanup) => {
      cleanup();
    });
  }
  var Source = class extends EventEmitter {
    constructor() {
      super();
      /** @internal */
      this._disposed = false;
      /** @internal */
      this._refCount = 0;
      /**
       * Used internally to mark if a source stems from an HLS reading operation. Used to suppress certain warnings.
       * @internal
       */
      this._usedForHls = false;
      /**
       * FinalizationRegistry for rogue refs to this source that didn't get freed. It lives on the Source itself so that
       * in case the Source transitively points back to itself and forms a cycle (for example through a custom
       * CustomSource callback) that we're not leaking memory.
       * @internal
       */
      this._refFinalizationRegistry = null;
      /** @internal */
      this._sizePromise = null;
      /**
       * Called each time data is retrieved from the source. Will be called with the retrieved range (end exclusive).
       *
       * @deprecated Use `source.on('read', ({ start, end }) => ...)` instead.
       */
      this.onread = null;
      if (typeof FinalizationRegistry !== "undefined") {
        this._refFinalizationRegistry = new FinalizationRegistry((source) => {
          source._decrementRefCount();
        });
      }
    }
    /**
     * Resolves with the total size of the file in bytes. This function is memoized, meaning only the first call
     * will retrieve the size.
     *
     * Returns null if the source is unsized.
     */
    async getSizeOrNull() {
      if (this._disposed) {
        throw new InputDisposedError();
      }
      return this._sizePromise ??= (async () => {
        let size = this._getFileSize();
        if (size !== void 0) {
          return size;
        }
        await this._read(0, 1, DEFAULT_MIN_READ_POSITION, DEFAULT_MAX_READ_POSITION);
        size = this._getFileSize();
        assert(size !== void 0);
        return size;
      })();
    }
    /**
     * Resolves with the total size of the file in bytes. This function is memoized, meaning only the first call
     * will retrieve the size.
     *
     * Throws an error if the source is unsized.
     */
    async getSize() {
      if (this._disposed) {
        throw new InputDisposedError();
      }
      const result = await this.getSizeOrNull();
      if (result === null) {
        throw new Error("Cannot determine the size of an unsized source.");
      }
      return result;
    }
    /**
     * Returns a new {@link RangedSource} that maps data onto this source using the given offset and length. If a length
     * is not provided, the ranged source spans until the end of this source's data.
     *
     * Useful for reading files that are embedded within larger files.
     */
    slice(offset, length) {
      if (!Number.isInteger(offset) || offset < 0) {
        throw new TypeError("offset must be a non-negative integer.");
      }
      if (length !== void 0 && (!Number.isInteger(length) || length < 0)) {
        throw new TypeError("length, when provided, must be a non-negative integer.");
      }
      return new RangedSource(this, offset, length);
    }
    /** @internal */
    _dispatchRead(start, end) {
      this.onread?.(start, end);
      this._emit("read", { start, end });
    }
    /**
     * Creates a new `SourceRef` pointing to this source. You are expected to call `.free()` on said `SourceRef` when
     * you're done with it.
     */
    ref() {
      return new SourceRef(this);
    }
    /** @internal */
    _incrementRefCount() {
      this._refCount++;
    }
    /** @internal */
    _decrementRefCount() {
      this._refCount--;
      if (this._refCount === 0) {
        this._dispose();
        this._disposed = true;
      }
    }
  };
  var SourceRef = class {
    /** @internal */
    constructor(source) {
      /** @internal */
      this._freed = false;
      if (source._disposed) {
        throw new Error("Cannot ref a disposed source.");
      }
      source._incrementRefCount();
      source._refFinalizationRegistry?.register(this, source, this);
      this._source = source;
    }
    /** The {@link Source} this ref references. Accessing this field throws an error after having freed the ref. */
    get source() {
      if (!this._source) {
        throw new Error("Can't get source; ref has already been freed.");
      }
      return this._source;
    }
    /** Whether or not this reference has been freed via {@link SourceRef.free}. */
    get freed() {
      return this._freed;
    }
    /**
     * Frees the ref, decrementing the source's internal reference count. If the source's internal reference count
     * reaches zero, it gets disposed. To catch bugs, this method throws if the ref is already freed.
     */
    free() {
      if (this._freed) {
        throw new Error("Illegal operation: double free on SourceRef.");
      }
      const source = this.source;
      assert(source._refCount > 0);
      source._decrementRefCount();
      source._refFinalizationRegistry?.unregister(this);
      this._freed = true;
      this._source = null;
    }
    /**
     * Calls {@link SourceRef.free}.
     */
    [Symbol.dispose]() {
      if (!this.freed) {
        this.free();
      }
    }
  };
  var PathedSource = class extends Source {
    constructor(rootPath, requestHandler) {
      if (typeof rootPath !== "string") {
        throw new TypeError("rootPath must be a string.");
      }
      if (typeof requestHandler !== "function") {
        throw new TypeError("requestHandler must be a function.");
      }
      super();
      this.rootPath = rootPath;
      this.requestHandler = requestHandler;
    }
    /** @internal */
    _resolveRequest(request) {
      const result = this.requestHandler(request);
      const handle = (result2) => {
        if (!(result2 instanceof Source || result2 instanceof SourceRef)) {
          throw new TypeError("requestHandler must return or resolve to a Source or SourceRef.");
        }
        const ref = result2 instanceof Source ? result2.ref() : result2;
        ref.source._usedForHls ||= this._usedForHls;
        return ref;
      };
      if (result instanceof Promise) {
        return result.then(handle);
      } else {
        return handle(result);
      }
    }
  };
  var sourceRequestsAreEqual = (a, b) => {
    return a.path === b.path;
  };
  var CustomPathedSource = class extends PathedSource {
    constructor() {
      super(...arguments);
      /** @internal */
      this._root = null;
      /** @internal */
      this._rootRequest = null;
    }
    /** @internal */
    _read(start, end, minReadPosition, maxReadPosition) {
      if (!this._root) {
        if (!this._rootRequest) {
          const result = this._resolveRequest({ path: this.rootPath, isRoot: true });
          const handle = (result2) => {
            const ref = result2 instanceof Source ? result2.ref() : result2;
            this._root = ref;
            this._rootRequest = null;
            return ref;
          };
          if (result instanceof Promise) {
            this._rootRequest = result.then(handle);
          } else {
            handle(result);
            assert(this._root);
          }
        }
        if (this._rootRequest) {
          return this._rootRequest.then((ref) => ref.source._read(start, end, minReadPosition, maxReadPosition));
        }
      }
      return this._root.source._read(start, end, minReadPosition, maxReadPosition);
    }
    /** @internal */
    _getFileSize() {
      if (this._root) {
        return this._root.source._getFileSize();
      }
      return void 0;
    }
    /** @internal */
    _dispose() {
      if (this._root) {
        this._root.free();
      } else if (this._rootRequest) {
        void this._rootRequest.then((ref) => ref.free());
      }
    }
  };
  var BufferSource = class extends Source {
    /**
     * Creates a new {@link BufferSource} backed by the specified `ArrayBuffer`, `SharedArrayBuffer`,
     * or `ArrayBufferView`.
     */
    constructor(buffer) {
      if (!(buffer instanceof ArrayBuffer) && !(typeof SharedArrayBuffer !== "undefined" && buffer instanceof SharedArrayBuffer) && !ArrayBuffer.isView(buffer)) {
        throw new TypeError("buffer must be an ArrayBuffer, SharedArrayBuffer, or ArrayBufferView.");
      }
      super();
      /** @internal */
      this._onreadCalled = false;
      this._bytes = toUint8Array(buffer);
      this._view = toDataView(buffer);
    }
    /** @internal */
    _getFileSize() {
      return this._bytes.byteLength;
    }
    /** @internal */
    _read() {
      if (!this._onreadCalled) {
        this._dispatchRead(0, this._bytes.byteLength);
        this._onreadCalled = true;
      }
      return {
        bytes: this._bytes,
        view: this._view,
        offset: 0
      };
    }
    /** @internal */
    _dispose() {
    }
  };
  var BlobSource = class extends Source {
    /**
     * Creates a new {@link BlobSource} backed by the specified
     * [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob).
     */
    constructor(blob, options = {}) {
      if (!(blob instanceof Blob)) {
        throw new TypeError("blob must be a Blob.");
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.maxCacheSize !== void 0 && (!isNumber(options.maxCacheSize) || options.maxCacheSize < 0)) {
        throw new TypeError("options.maxCacheSize, when provided, must be a non-negative number.");
      }
      if (options.useStreamReader !== void 0 && typeof options.useStreamReader !== "boolean") {
        throw new TypeError("options.useStreamReader, when provided, must be a boolean.");
      }
      super();
      /** @internal */
      this._readers = /* @__PURE__ */ new WeakMap();
      this._blob = blob;
      this._options = options;
      this._orchestrator = new ReadOrchestrator({
        maxCacheSize: options.maxCacheSize ?? 8 * 2 ** 20,
        maxWorkerCount: 4,
        runWorker: this._runWorker.bind(this),
        prefetchProfile: PREFETCH_PROFILES.fileSystem
      });
      this._orchestrator.fileSize = blob.size;
    }
    /** @internal */
    _getFileSize() {
      return this._orchestrator.fileSize;
    }
    /** @internal */
    _read(start, end, minReadPosition, maxReadPosition) {
      return this._orchestrator.read(start, end, minReadPosition, maxReadPosition);
    }
    /** @internal */
    async _runWorker(worker) {
      assert(worker.strictTarget);
      let reader = this._readers.get(worker);
      if (reader === void 0) {
        if ("stream" in this._blob && !isWebKit() && this._options.useStreamReader !== false) {
          const slice = this._blob.slice(worker.currentPos);
          reader = slice.stream().getReader();
        } else {
          reader = null;
        }
        this._readers.set(worker, reader);
      }
      while (worker.currentPos < worker.targetPos && !worker.aborted) {
        if (reader) {
          const { done, value } = await reader.read();
          if (done) {
            this._orchestrator.onWorkerFinished(worker);
            throw new Error("Blob reader stopped unexpectedly before all requested data was read.");
          }
          if (worker.aborted) {
            break;
          }
          this._dispatchRead(worker.currentPos, worker.currentPos + value.length);
          this._orchestrator.supplyWorkerData(worker, value);
        } else {
          const data = await this._blob.slice(worker.currentPos, worker.targetPos).arrayBuffer();
          if (worker.aborted) {
            break;
          }
          this._dispatchRead(worker.currentPos, worker.currentPos + data.byteLength);
          this._orchestrator.supplyWorkerData(worker, new Uint8Array(data));
        }
      }
      this._orchestrator.signalWorkerStoppedRunning(worker);
      if (worker.aborted) {
        await reader?.cancel();
      }
    }
    /** @internal */
    _dispose() {
      this._orchestrator.dispose();
    }
  };
  var URL_SOURCE_MIN_LOAD_AMOUNT = 0.5 * 2 ** 20;
  var DEFAULT_RETRY_DELAY = (previousAttempts, error, src) => {
    const couldBeCorsError = error instanceof Error && (error.message.includes("Failed to fetch") || error.message.includes("Load failed") || error.message.includes("NetworkError when attempting to fetch resource")) && typeof window !== "undefined";
    if (couldBeCorsError) {
      let originOfSrc = null;
      try {
        if (typeof window !== "undefined" && typeof window.location !== "undefined") {
          originOfSrc = new URL(src instanceof Request ? src.url : src, window.location.href).origin;
        }
      } catch {
      }
      const isOnline = typeof navigator !== "undefined" && typeof navigator.onLine === "boolean" ? navigator.onLine : true;
      if (isOnline && originOfSrc !== null && originOfSrc !== window.location.origin) {
        Logging._warn(
          `Request will not be retried because a CORS error was suspected due to different origins. You can modify this behavior by providing your own function for the 'getRetryDelay' option.`
        );
        return null;
      }
    }
    return Math.min(2 ** (previousAttempts - 2), 16);
  };
  var warnedOrigins = /* @__PURE__ */ new Set();
  var UrlSource = class _UrlSource extends PathedSource {
    /**
     * Creates a new {@link UrlSource} backed by the resource at the specified URL.
     *
     * When passing a `Request` instance, note that its `signal` will be overridden by Mediabunny; if you want to cancel
     * ongoing requests, use {@link Input.dispose}.
     */
    constructor(url2, options = {}) {
      if (typeof url2 !== "string" && !(url2 instanceof URL) && !(typeof Request !== "undefined" && url2 instanceof Request)) {
        throw new TypeError("url must be a string, URL or Request.");
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.requestInit !== void 0 && (!options.requestInit || typeof options.requestInit !== "object")) {
        throw new TypeError("options.requestInit, when provided, must be an object.");
      }
      if (options.getRetryDelay !== void 0 && typeof options.getRetryDelay !== "function") {
        throw new TypeError("options.getRetryDelay, when provided, must be a function.");
      }
      if (options.maxCacheSize !== void 0 && (!isNumber(options.maxCacheSize) || options.maxCacheSize < 0)) {
        throw new TypeError("options.maxCacheSize, when provided, must be a non-negative number.");
      }
      if (options.parallelism !== void 0 && (!Number.isInteger(options.parallelism) || options.parallelism < 1)) {
        throw new TypeError("options.parallelism, when provided, must be a positive number.");
      }
      if (options.fetchFn !== void 0 && typeof options.fetchFn !== "function") {
        throw new TypeError("options.fetchFn, when provided, must be a function.");
      }
      const urlString = url2 instanceof Request ? url2.url : url2 instanceof URL ? url2.href : url2;
      super(
        urlString,
        (request) => new _UrlSource(request.path, this._options)
      );
      /** @internal */
      this._offset = 0;
      /** @internal */
      this._length = null;
      /**
       * Note that this value being true does NOT mean the file size can't change anymore; it just signals that we have at
       * least checked if we know the file size or not.
       * @internal
       */
      this._fileSizeDetermined = false;
      /**
       * When the server doesn't support range requests, we abandon the orchestrator and instead defer to an internal
       * ReadableStreamSource wrapping the response body, which pulls new data only when reads demand it.
       * @internal
       */
      this._sequentialBacking = null;
      this._url = url2;
      this._options = options;
      this._getRetryDelay = options.getRetryDelay ?? DEFAULT_RETRY_DELAY;
      this._requestInit = { ...options.requestInit };
      let rangeHeaderValue = null;
      if (options.requestInit?.headers) {
        const headers = { ...normalizeHeaders(options.requestInit.headers) };
        const rangeKey = Object.keys(headers).find((key) => key.toLowerCase() === "range");
        if (rangeKey !== void 0) {
          rangeHeaderValue = headers[rangeKey];
          delete headers[rangeKey];
          this._requestInit.headers = headers;
        }
      }
      if (url2 instanceof Request) {
        const requestRange = url2.headers.get("Range");
        if (requestRange !== null) {
          rangeHeaderValue ??= requestRange;
          const strippedRequest = new Request(url2);
          strippedRequest.headers.delete("Range");
          this._url = strippedRequest;
        }
      }
      if (rangeHeaderValue !== null) {
        const parsed = parseByteRangeHeader(rangeHeaderValue);
        if (parsed) {
          this._offset = parsed.offset;
          this._length = parsed.length;
        }
      }
      const DEFAULT_PARALLELISM = 2;
      this._orchestrator = new ReadOrchestrator({
        maxCacheSize: options.maxCacheSize ?? 64 * 2 ** 20,
        maxWorkerCount: options.parallelism ?? DEFAULT_PARALLELISM,
        runWorker: this._runWorker.bind(this),
        prefetchProfile: PREFETCH_PROFILES.network
      });
    }
    /** @internal */
    _getFileSize() {
      if (!this._fileSizeDetermined) {
        return this._length !== null ? this._length : void 0;
      }
      const baseSize = this._sequentialBacking ? this._sequentialBacking._endIndex : this._orchestrator.fileSize;
      if (baseSize === null) {
        return this._length !== null ? this._length : null;
      }
      return clamp(baseSize - this._offset, 0, this._length ?? Infinity);
    }
    /** @internal */
    _read(start, end, minReadPosition, maxReadPosition) {
      if (this._length !== null && end > this._length) {
        return null;
      }
      const offset = this._offset;
      const result = this._sequentialBacking ? this._sequentialBacking._read(offset + start, offset + end) : this._orchestrator.read(
        offset + start,
        offset + end,
        Math.max(offset + minReadPosition, offset),
        offset + Math.min(maxReadPosition, this._length ?? Infinity)
      );
      const processResult = (result2) => {
        if (!result2) {
          return null;
        }
        result2.offset -= this._offset;
        return result2;
      };
      if (result instanceof Promise) {
        return result.then(processResult);
      } else {
        return processResult(result);
      }
    }
    /** @internal */
    async _runWorker(worker) {
      while (true) {
        const abortController = new AbortController();
        const response = await retriedFetch(
          this._options.fetchFn ?? fetch,
          this._url,
          mergeRequestInit(this._requestInit, {
            headers: {
              // Always sending a range request is a good way to probe if the server supports them
              Range: `bytes=${worker.currentPos}-`
            },
            signal: abortController.signal
          }),
          this._getRetryDelay,
          () => this._disposed
        );
        if (!response.ok) {
          throw new Error(`Error fetching ${String(this._url)}: ${response.status} ${response.statusText}`);
        }
        if (response.redirected) {
          this.rootPath = response.url;
        }
        outer:
          if (this._orchestrator.fileSize === null) {
            const contentRange = response.headers.get("Content-Range");
            if (contentRange) {
              const match = /\/(\d+)/.exec(contentRange);
              if (match) {
                this._orchestrator.supplyFileSize(Number(match[1]));
                break outer;
              }
            }
            const contentLength = response.headers.get("Content-Length");
            if (contentLength) {
              const basePos = response.status === 206 ? worker.currentPos : 0;
              this._orchestrator.supplyFileSize(basePos + Number(contentLength));
            }
          }
        this._fileSizeDetermined = true;
        if (!response.body) {
          throw new Error(
            "Missing HTTP response body stream. The used fetch function must provide the response body as a ReadableStream."
          );
        }
        if (response.status !== 206) {
          if (this._sequentialBacking) {
            void response.body.cancel();
            return;
          }
          if (!this._usedForHls) {
            const url2 = new URL(
              this._url instanceof Request ? this._url.url : this._url,
              typeof window !== "undefined" ? window.location.href : void 0
            );
            if (url2.origin !== "null" && !(url2.pathname.endsWith(".m3u8") || url2.pathname.endsWith(".m3u"))) {
              if (!warnedOrigins.has(url2.origin)) {
                Logging._warn(
                  `HTTP server (origin ${url2.origin}) did not respond to a range request with 206 Partial Content, meaning the resource will now be streamed sequentially, with old data being evicted from the cache. Reads into evicted regions will throw. To enable efficient media file streaming across a network, please make sure your server supports range requests. Alternatively, set maxCacheSize to Infinity in the UrlSource options to keep the entire resource in memory.`
                );
                warnedOrigins.add(url2.origin);
              }
            }
          }
          this._transitionToSequentialMode(response.body);
          return;
        }
        const reader = response.body.getReader();
        while (true) {
          if (worker.currentPos >= worker.targetPos || worker.aborted) {
            abortController.abort();
            this._orchestrator.signalWorkerStoppedRunning(worker);
            return;
          }
          let readResult;
          try {
            readResult = await reader.read();
          } catch (error) {
            if (this._disposed) {
              throw error;
            }
            const retryDelayInSeconds = this._getRetryDelay(1, error, this._url);
            if (retryDelayInSeconds !== null) {
              Logging._error("Error while reading response stream. Attempting to resume.", error);
              await wait(1e3 * retryDelayInSeconds);
              break;
            } else {
              throw error;
            }
          }
          if (worker.aborted) {
            continue;
          }
          const { done, value } = readResult;
          if (done) {
            if (worker.currentPos >= worker.targetPos) {
              this._orchestrator.onWorkerFinished(worker);
              return;
            }
            if (worker.strictTarget) {
              break;
            } else {
              this._orchestrator.onWorkerFinished(worker);
              return;
            }
          }
          this._dispatchRead(worker.currentPos, worker.currentPos + value.length);
          this._orchestrator.supplyWorkerData(worker, value);
        }
      }
    }
    /** @internal */
    _transitionToSequentialMode(body) {
      let currentReader = body.getReader();
      let streamPosition = 0;
      let skipRemaining = 0;
      const wrappedStream = new ReadableStream({
        pull: async (controller) => {
          while (true) {
            let readResult;
            try {
              readResult = await currentReader.read();
            } catch (error) {
              if (this._disposed) {
                throw error;
              }
              const retryDelayInSeconds = this._getRetryDelay(1, error, this._url);
              if (retryDelayInSeconds === null) {
                throw error;
              }
              Logging._error("Error while reading response stream. Attempting to resume.", error);
              await wait(1e3 * retryDelayInSeconds);
              const newResponse = await retriedFetch(
                this._options.fetchFn ?? fetch,
                this._url,
                mergeRequestInit(this._requestInit, {
                  headers: {
                    // Who knows, maybe the server honors range requests this time
                    Range: `bytes=${streamPosition}-`
                  }
                }),
                this._getRetryDelay,
                () => this._disposed
              );
              if (!newResponse.ok) {
                throw new Error(
                  // eslint-disable-next-line @typescript-eslint/no-base-to-string
                  `Error fetching ${String(this._url)}: ${newResponse.status} ${newResponse.statusText}`
                );
              }
              if (!newResponse.body) {
                throw new Error(
                  "Missing HTTP response body stream. The used fetch function must provide the response body as a ReadableStream."
                );
              }
              currentReader = newResponse.body.getReader();
              skipRemaining = newResponse.status === 206 ? 0 : streamPosition;
              continue;
            }
            if (readResult.done) {
              controller.close();
              return;
            }
            let chunk = readResult.value;
            if (skipRemaining > 0) {
              const skippedAmount = Math.min(skipRemaining, chunk.length);
              skipRemaining -= skippedAmount;
              chunk = chunk.subarray(skippedAmount);
            }
            if (chunk.length === 0) {
              continue;
            }
            streamPosition += chunk.length;
            controller.enqueue(chunk);
            return;
          }
        },
        cancel: () => currentReader.cancel()
      });
      const backing = new ReadableStreamSource(wrappedStream, {
        maxCacheSize: this._orchestrator.options.maxCacheSize
      });
      backing._endIndex = this._orchestrator.fileSize;
      backing._cacheMissErrorMessage = "Attempted to read data from an already-evicted part of the cache. Because the HTTP server did not honor the range request, data can only be read sequentially, with old data being evicted from the cache. To fix this issue, either ensure your server responds to range requests with 206 Partial Content, or set maxCacheSize to Infinity in the UrlSource options. Note that the latter will store the entire file in the cache if needed, no matter how large.";
      backing.on("read", ({ start, end }) => this._dispatchRead(start, end));
      this._sequentialBacking = backing;
      const uniqueSlices = /* @__PURE__ */ new Set();
      for (const otherWorker of this._orchestrator.workers) {
        for (const slice of otherWorker.pendingSlices) {
          uniqueSlices.add(slice);
        }
        otherWorker.aborted = true;
        otherWorker.pendingSlices.length = 0;
      }
      for (const queuedRead of this._orchestrator.queuedReads) {
        for (const slice of queuedRead.pendingSlices) {
          uniqueSlices.add(slice);
        }
      }
      this._orchestrator.workers.length = 0;
      this._orchestrator.queuedReads.length = 0;
      for (const slice of uniqueSlices) {
        const result = backing._read(slice.start, slice.start + slice.bytes.length);
        if (result instanceof Promise) {
          result.then((readResult) => {
            if (readResult) {
              assert(readResult.offset === slice.start);
              slice.resolve(readResult.bytes);
            } else {
              slice.resolve(null);
            }
          }, (error) => slice.reject(error));
        } else {
          assert(result === null);
          slice.resolve(null);
        }
      }
    }
    /** @internal */
    _dispose() {
      this._orchestrator.dispose();
      if (this._sequentialBacking) {
        this._sequentialBacking._disposed = true;
        this._sequentialBacking._dispose();
      }
    }
  };
  var BYTE_RANGE_REGEX = /^bytes=(\d+)-(\d*)$/;
  var parseByteRangeHeader = (value) => {
    const match = BYTE_RANGE_REGEX.exec(value.trim());
    if (!match) {
      return null;
    }
    const offset = Number(match[1]);
    const end = match[2] === "" ? null : Number(match[2]);
    if (end !== null && end < offset) {
      return null;
    }
    return {
      offset,
      length: end !== null ? end - offset + 1 : null
    };
  };
  var FilePathSource = class _FilePathSource extends PathedSource {
    /** Creates a new {@link FilePathSource} backed by the file at the specified file path. */
    constructor(filePath, options = {}) {
      if (typeof filePath !== "string") {
        throw new TypeError("filePath must be a string.");
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.maxCacheSize !== void 0 && (!isNumber(options.maxCacheSize) || options.maxCacheSize < 0)) {
        throw new TypeError("options.maxCacheSize, when provided, must be a non-negative number.");
      }
      if (!node.fs) {
        throw new Error(
          "FilePathSource is only available in server-side environments (Node.js, Bun, Deno)."
        );
      }
      super(filePath, (request) => new _FilePathSource(request.path, options));
      /** @internal */
      this._fileHandle = null;
      this._customSource = new CustomSource({
        getSize: async () => {
          const fileHandle = await node.fs.open(filePath, "r");
          this._fileHandle = fileHandle;
          sourceFinalizationRegistry?.register(this, () => {
            void fileHandle.close();
          }, this);
          const stats = await fileHandle.stat();
          return stats.size;
        },
        read: async (start, end) => {
          assert(this._fileHandle);
          const buffer = new Uint8Array(end - start);
          await this._fileHandle.read(buffer, 0, end - start, start);
          return buffer;
        },
        maxCacheSize: options.maxCacheSize,
        prefetchProfile: "fileSystem"
      });
    }
    /** @internal */
    _read(start, end, minReadPosition, maxReadPosition) {
      return this._customSource._read(start, end, minReadPosition, maxReadPosition);
    }
    /** @internal */
    _getFileSize() {
      return this._customSource._getFileSize();
    }
    /** @internal */
    _dispose() {
      this._customSource._dispose();
      if (this._fileHandle) {
        void this._fileHandle.close();
        this._fileHandle = null;
        sourceFinalizationRegistry?.unregister(this);
      }
    }
  };
  var CustomSource = class extends Source {
    /** Creates a new {@link CustomSource} whose behavior is specified by `options`.  */
    constructor(options) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (typeof options.getSize !== "function") {
        throw new TypeError("options.getSize must be a function.");
      }
      if (typeof options.read !== "function") {
        throw new TypeError("options.read must be a function.");
      }
      if (options.dispose !== void 0 && typeof options.dispose !== "function") {
        throw new TypeError("options.dispose, when provided, must be a function.");
      }
      if (options.maxCacheSize !== void 0 && (!isNumber(options.maxCacheSize) || options.maxCacheSize < 0)) {
        throw new TypeError("options.maxCacheSize, when provided, must be a non-negative number.");
      }
      if (options.prefetchProfile && !["none", "fileSystem", "network"].includes(options.prefetchProfile)) {
        throw new TypeError(
          "options.prefetchProfile, when provided, must be one of 'none', 'fileSystem' or 'network'."
        );
      }
      super();
      this._options = options;
      this._orchestrator = new ReadOrchestrator({
        maxCacheSize: options.maxCacheSize ?? 8 * 2 ** 20,
        maxWorkerCount: 2,
        // Fixed for now, *should* be fine
        prefetchProfile: PREFETCH_PROFILES[options.prefetchProfile ?? "none"],
        runWorker: this._runWorker.bind(this)
      });
    }
    /** @internal */
    _getFileSize() {
      return this._orchestrator.fileSize ?? void 0;
    }
    /** @internal */
    _read(start, end, minReadPosition, maxReadPosition) {
      if (this._orchestrator.fileSize !== null) {
        return this._orchestrator.read(start, end, minReadPosition, maxReadPosition);
      }
      const result = this._options.getSize();
      if (result instanceof Promise) {
        return result.then((size) => {
          if (!Number.isInteger(size) || size < 0) {
            throw new TypeError("options.getSize must return or resolve to a non-negative integer.");
          }
          this._orchestrator.fileSize = size;
          return this._orchestrator.read(start, end, minReadPosition, maxReadPosition);
        });
      } else {
        if (!Number.isInteger(result) || result < 0) {
          throw new TypeError("options.getSize must return or resolve to a non-negative integer.");
        }
        this._orchestrator.fileSize = result;
        return this._orchestrator.read(start, end, minReadPosition, maxReadPosition);
      }
    }
    /** @internal */
    async _runWorker(worker) {
      while (worker.currentPos < worker.targetPos && !worker.aborted) {
        const originalCurrentPos = worker.currentPos;
        const originalTargetPos = worker.targetPos;
        let data = this._options.read(worker.currentPos, originalTargetPos);
        if (data instanceof Promise) data = await data;
        if (worker.aborted) {
          break;
        }
        if (data instanceof Uint8Array) {
          data = toUint8Array(data);
          if (data.length !== originalTargetPos - worker.currentPos) {
            throw new Error(
              `options.read returned a Uint8Array with unexpected length: Requested ${originalTargetPos - worker.currentPos} bytes, but got ${data.length}.`
            );
          }
          this._dispatchRead(worker.currentPos, worker.currentPos + data.length);
          this._orchestrator.supplyWorkerData(worker, data);
        } else if (data instanceof ReadableStream) {
          const reader = data.getReader();
          while (worker.currentPos < originalTargetPos && !worker.aborted) {
            const { done, value } = await reader.read();
            if (done) {
              if (worker.currentPos < originalTargetPos) {
                throw new Error(
                  `ReadableStream returned by options.read ended before supplying enough data. Requested ${originalTargetPos - originalCurrentPos} bytes, but got ${worker.currentPos - originalCurrentPos}`
                );
              }
              break;
            }
            if (!(value instanceof Uint8Array)) {
              throw new TypeError("ReadableStream returned by options.read must yield Uint8Array chunks.");
            }
            if (worker.aborted) {
              break;
            }
            const data2 = toUint8Array(value);
            this._dispatchRead(worker.currentPos, worker.currentPos + data2.length);
            this._orchestrator.supplyWorkerData(worker, data2);
          }
        } else {
          throw new TypeError("options.read must return or resolve to a Uint8Array or a ReadableStream.");
        }
      }
      this._orchestrator.signalWorkerStoppedRunning(worker);
    }
    /** @internal */
    _dispose() {
      this._orchestrator.dispose();
      this._options.dispose?.();
    }
  };
  var StreamSource = CustomSource;
  var ReadableStreamSource = class extends Source {
    /** Creates a new {@link ReadableStreamSource} backed by the specified `ReadableStream<Uint8Array>`. */
    constructor(stream, options = {}) {
      if (!(stream instanceof ReadableStream)) {
        throw new TypeError("stream must be a ReadableStream.");
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.maxCacheSize !== void 0 && (!isNumber(options.maxCacheSize) || options.maxCacheSize < 0)) {
        throw new TypeError("options.maxCacheSize, when provided, must be a non-negative number.");
      }
      super();
      /** @internal */
      this._reader = null;
      /** @internal */
      this._cache = [];
      /** @internal */
      this._pendingSlices = [];
      /** @internal */
      this._currentIndex = 0;
      /** @internal */
      this._targetIndex = 0;
      /** @internal */
      this._maxRequestedIndex = 0;
      /** @internal */
      this._endIndex = null;
      /** @internal */
      this._pulling = false;
      /**
       * Overridable for internal use.
       * @internal
       */
      this._cacheMissErrorMessage = "Attempted to read data from an already-evicted part of the cache. With ReadableStreamSource, you must access the data more sequentially or increase the size of its cache.";
      this._stream = stream;
      this._maxCacheSize = options.maxCacheSize ?? 32 * 2 ** 20;
    }
    /** @internal */
    _getFileSize() {
      return this._endIndex;
    }
    /** @internal */
    _read(start, end) {
      if (this._endIndex !== null && end > this._endIndex) {
        return null;
      }
      this._maxRequestedIndex = Math.max(this._maxRequestedIndex, end);
      const cacheStartIndex = binarySearchLessOrEqual(this._cache, start, (x) => x.start);
      const cacheStartEntry = cacheStartIndex !== -1 ? this._cache[cacheStartIndex] : null;
      if (cacheStartEntry && cacheStartEntry.start <= start && end <= cacheStartEntry.end) {
        return {
          bytes: cacheStartEntry.bytes,
          view: cacheStartEntry.view,
          offset: cacheStartEntry.start
        };
      }
      let lastEnd = start;
      const bytes2 = new Uint8Array(end - start);
      if (cacheStartIndex !== -1) {
        for (let i = cacheStartIndex; i < this._cache.length; i++) {
          const cacheEntry = this._cache[i];
          if (cacheEntry.start >= end) {
            break;
          }
          const cappedStart = Math.max(start, cacheEntry.start);
          if (cappedStart > lastEnd) {
            this._throwDueToCacheMiss();
          }
          const cappedEnd = Math.min(end, cacheEntry.end);
          if (cappedStart < cappedEnd) {
            bytes2.set(
              cacheEntry.bytes.subarray(cappedStart - cacheEntry.start, cappedEnd - cacheEntry.start),
              cappedStart - start
            );
            lastEnd = cappedEnd;
          }
        }
      }
      if (lastEnd === end) {
        return {
          bytes: bytes2,
          view: toDataView(bytes2),
          offset: start
        };
      }
      if (this._currentIndex > lastEnd) {
        this._throwDueToCacheMiss();
      }
      const { promise, resolve, reject } = promiseWithResolvers();
      this._pendingSlices.push({
        start,
        end,
        bytes: bytes2,
        resolve,
        reject
      });
      this._targetIndex = Math.max(this._targetIndex, end);
      if (!this._pulling) {
        this._pulling = true;
        void this._pull().catch((error) => {
          this._pulling = false;
          if (this._pendingSlices.length > 0) {
            this._pendingSlices.forEach((x) => x.reject(error));
            this._pendingSlices.length = 0;
          } else {
            throw error;
          }
        });
      }
      return promise;
    }
    /** @internal */
    _throwDueToCacheMiss() {
      throw new Error(this._cacheMissErrorMessage);
    }
    /** @internal */
    async _pull() {
      this._reader ??= this._stream.getReader();
      while (this._currentIndex < this._targetIndex && !this._disposed) {
        const { done, value } = await this._reader.read();
        if (done) {
          for (const pendingSlice of this._pendingSlices) {
            pendingSlice.resolve(null);
          }
          this._pendingSlices.length = 0;
          this._endIndex = this._currentIndex;
          break;
        }
        const startIndex = this._currentIndex;
        const endIndex = this._currentIndex + value.byteLength;
        this._dispatchRead(startIndex, endIndex);
        for (let i = 0; i < this._pendingSlices.length; i++) {
          const pendingSlice = this._pendingSlices[i];
          const cappedStart = Math.max(startIndex, pendingSlice.start);
          const cappedEnd = Math.min(endIndex, pendingSlice.end);
          if (cappedStart < cappedEnd) {
            pendingSlice.bytes.set(
              value.subarray(cappedStart - startIndex, cappedEnd - startIndex),
              cappedStart - pendingSlice.start
            );
            if (cappedEnd === pendingSlice.end) {
              pendingSlice.resolve({
                bytes: pendingSlice.bytes,
                view: toDataView(pendingSlice.bytes),
                offset: pendingSlice.start
              });
              this._pendingSlices.splice(i, 1);
              i--;
            }
          }
        }
        this._cache.push({
          start: startIndex,
          end: endIndex,
          bytes: value,
          view: toDataView(value),
          age: 0
          // Unused
        });
        while (this._cache.length > 0) {
          const firstEntry = this._cache[0];
          const distance = this._maxRequestedIndex - firstEntry.end;
          if (distance <= this._maxCacheSize) {
            break;
          }
          this._cache.shift();
        }
        this._currentIndex += value.byteLength;
      }
      this._pulling = false;
    }
    /** @internal */
    _dispose() {
      for (const pendingSlice of this._pendingSlices) {
        pendingSlice.reject(new InputDisposedError());
      }
      this._pendingSlices.length = 0;
      this._cache.length = 0;
      void this._reader?.cancel();
    }
  };
  var PREFETCH_PROFILES = {
    none: (start, end) => ({ start, end }),
    fileSystem: (start, end) => {
      const padding = 2 ** 16;
      start = Math.floor((start - padding) / padding) * padding;
      end = Math.ceil((end + padding) / padding) * padding;
      return { start, end };
    },
    network: (start, end, workers) => {
      const paddingStart = 2 ** 16;
      start = Math.max(0, Math.floor((start - paddingStart) / paddingStart) * paddingStart);
      for (const worker of workers) {
        const maxExtensionAmount = 8 * 2 ** 20;
        const thresholdPoint = Math.max(
          (worker.startPos + worker.targetPos) / 2,
          worker.targetPos - maxExtensionAmount
        );
        if (closedIntervalsOverlap(
          start,
          end,
          thresholdPoint,
          worker.targetPos
        )) {
          const size = worker.targetPos - worker.startPos;
          const a = Math.ceil((size + 1) / maxExtensionAmount) * maxExtensionAmount;
          const b = 2 ** Math.ceil(Math.log2(size + 1));
          const extent = Math.min(b, a);
          end = Math.max(end, worker.startPos + extent);
        }
      }
      end = Math.max(end, start + URL_SOURCE_MIN_LOAD_AMOUNT);
      return {
        start,
        end
      };
    }
  };
  var ReadOrchestrator = class {
    constructor(options) {
      this.options = options;
      this.fileSize = null;
      this.nextAge = 0;
      // Used for multiple things
      this.workers = [];
      this.cache = [];
      this.currentCacheSize = 0;
      this.disposed = false;
      this.queuedReads = [];
    }
    read(innerStart, innerEnd, minReadPosition, maxReadPosition) {
      assert(!this.disposed);
      const prefetchRange = this.options.prefetchProfile(innerStart, innerEnd, this.workers);
      const outerStart = Math.max(prefetchRange.start, minReadPosition);
      const outerEnd = Math.min(prefetchRange.end, this.fileSize ?? Infinity, maxReadPosition);
      assert(outerStart <= innerStart && innerEnd <= outerEnd);
      let result = null;
      const innerCacheStartIndex = binarySearchLessOrEqual(this.cache, innerStart, (x) => x.start);
      const innerStartEntry = innerCacheStartIndex !== -1 ? this.cache[innerCacheStartIndex] : null;
      if (innerStartEntry && innerStartEntry.start <= innerStart && innerEnd <= innerStartEntry.end) {
        innerStartEntry.age = this.nextAge++;
        result = {
          bytes: innerStartEntry.bytes,
          view: innerStartEntry.view,
          offset: innerStartEntry.start
        };
      }
      const outerCacheStartIndex = binarySearchLessOrEqual(this.cache, outerStart, (x) => x.start);
      const bytes2 = result ? null : new Uint8Array(innerEnd - innerStart);
      let contiguousBytesWriteEnd = 0;
      let lastEnd = outerStart;
      const outerHoles = [];
      if (outerCacheStartIndex !== -1) {
        for (let i = outerCacheStartIndex; i < this.cache.length; i++) {
          const entry = this.cache[i];
          if (entry.start >= outerEnd) {
            break;
          }
          if (entry.end <= outerStart) {
            continue;
          }
          const cappedOuterStart = Math.max(outerStart, entry.start);
          const cappedOuterEnd = Math.min(outerEnd, entry.end);
          assert(cappedOuterStart <= cappedOuterEnd);
          if (lastEnd < cappedOuterStart) {
            outerHoles.push({ start: lastEnd, end: cappedOuterStart });
          }
          lastEnd = cappedOuterEnd;
          if (bytes2) {
            const cappedInnerStart = Math.max(innerStart, entry.start);
            const cappedInnerEnd = Math.min(innerEnd, entry.end);
            if (cappedInnerStart < cappedInnerEnd) {
              const relativeOffset = cappedInnerStart - innerStart;
              bytes2.set(
                entry.bytes.subarray(cappedInnerStart - entry.start, cappedInnerEnd - entry.start),
                relativeOffset
              );
              if (relativeOffset === contiguousBytesWriteEnd) {
                contiguousBytesWriteEnd = cappedInnerEnd - innerStart;
              }
            }
          }
          entry.age = this.nextAge++;
        }
        if (lastEnd < outerEnd) {
          outerHoles.push({ start: lastEnd, end: outerEnd });
        }
      } else {
        outerHoles.push({ start: outerStart, end: outerEnd });
      }
      if (bytes2 && contiguousBytesWriteEnd >= bytes2.length) {
        result = {
          bytes: bytes2,
          view: toDataView(bytes2),
          offset: innerStart
        };
      }
      if (outerHoles.length === 0) {
        assert(result);
        return result;
      }
      const { promise, resolve, reject } = promiseWithResolvers();
      const innerHoles = [];
      for (const outerHole of outerHoles) {
        const cappedStart = Math.max(innerStart, outerHole.start);
        const cappedEnd = Math.min(innerEnd, outerHole.end);
        if (cappedStart === outerHole.start && cappedEnd === outerHole.end) {
          innerHoles.push(outerHole);
        } else if (cappedStart < cappedEnd) {
          innerHoles.push({ start: cappedStart, end: cappedEnd });
        }
      }
      const pendingSlice = bytes2 && {
        start: innerStart,
        bytes: bytes2,
        holes: innerHoles,
        resolve,
        reject
      };
      outer:
        for (const outerHole of outerHoles) {
          for (const worker of this.workers) {
            const addedToWorker = this.checkHoleAgainstWorker(
              worker,
              outerHole,
              pendingSlice ? [pendingSlice] : []
            );
            if (addedToWorker) {
              this.checkQueuedReadsAgainstWorker(worker);
              continue outer;
            }
          }
          const strictTarget = outerHole.end < outerEnd || this.fileSize !== null;
          const newWorker = this.createWorker(outerHole.start, outerHole.end, strictTarget);
          if (newWorker) {
            if (pendingSlice) {
              newWorker.pendingSlices = [pendingSlice];
            }
            this.runWorker(newWorker);
          } else {
            let index = binarySearchLessOrEqual(this.queuedReads, outerHole.start, (x) => x.hole.start);
            let entry = index !== -1 ? this.queuedReads[index] : null;
            if (entry && outerHole.start <= entry.hole.end) {
              entry.hole.end = Math.max(entry.hole.end, outerHole.end);
              entry.strictTarget &&= strictTarget;
              if (pendingSlice) {
                entry.pendingSlices.push(pendingSlice);
              }
            } else {
              index++;
              entry = {
                hole: {
                  // Clone the hole because it might be mutated later
                  start: outerHole.start,
                  end: outerHole.end
                },
                strictTarget,
                pendingSlices: pendingSlice ? [pendingSlice] : [],
                age: this.nextAge++
              };
              this.queuedReads.splice(index, 0, entry);
            }
            while (index + 1 < this.queuedReads.length) {
              const nextEntry = this.queuedReads[index + 1];
              if (nextEntry.hole.start > entry.hole.end) {
                break;
              }
              entry.hole.end = Math.max(entry.hole.end, nextEntry.hole.end);
              entry.pendingSlices.push(...nextEntry.pendingSlices);
              entry.strictTarget &&= nextEntry.strictTarget;
              entry.age = Math.min(entry.age, nextEntry.age);
              this.queuedReads.splice(index + 1, 1);
            }
          }
        }
      if (!result) {
        assert(bytes2);
        result = promise.then((bytes3) => bytes3 && {
          bytes: bytes3,
          view: toDataView(bytes3),
          offset: innerStart
        });
      } else {
        promise.catch((error) => {
          if (this.disposed) {
            return;
          }
          throw error;
        });
      }
      return result;
    }
    checkHoleAgainstWorker(worker, hole, pendingSlices) {
      const gapTolerance = 2 ** 17;
      if (closedIntervalsOverlap(
        hole.start - gapTolerance,
        hole.start,
        worker.currentPos,
        worker.targetPos
      )) {
        worker.targetPos = Math.max(worker.targetPos, hole.end);
        for (let i = 0; i < pendingSlices.length; i++) {
          const pendingSlice = pendingSlices[i];
          if (!worker.pendingSlices.includes(pendingSlice)) {
            worker.pendingSlices.push(pendingSlice);
          }
        }
        if (!worker.running) {
          this.runWorker(worker);
        }
        return true;
      }
      return false;
    }
    checkQueuedReadsAgainstWorker(worker) {
      let wasTrueOnce = false;
      for (let i = 0; i < this.queuedReads.length; i++) {
        const queuedRead = this.queuedReads[i];
        const result = this.checkHoleAgainstWorker(worker, queuedRead.hole, queuedRead.pendingSlices);
        if (result) {
          this.queuedReads.splice(i, 1);
          i--;
          wasTrueOnce = true;
        } else if (wasTrueOnce) {
          break;
        }
      }
    }
    createWorker(startPos, targetPos, strictTarget) {
      if (this.workers.length >= this.options.maxWorkerCount) {
        let oldestWorker = null;
        let oldestIndex = null;
        for (let i = 0; i < this.workers.length; i++) {
          const worker2 = this.workers[i];
          if (!worker2.running && worker2.pendingSlices.length === 0 && (!oldestWorker || worker2.age < oldestWorker.age)) {
            oldestIndex = i;
            oldestWorker = worker2;
          }
        }
        if (oldestWorker) {
          assert(oldestIndex !== null);
          assert(oldestWorker.pendingSlices.length === 0);
          this.workers.splice(oldestIndex, 1);
        } else {
          return null;
        }
      }
      const worker = {
        startPos,
        currentPos: startPos,
        targetPos,
        strictTarget,
        running: false,
        // Due to async shenanigans, it can happen that workers are started after disposal. In this case, instead of
        // simply not creating the worker, we allow it to run but immediately label it as aborted, so it can then
        // shut itself down.
        aborted: this.disposed,
        pendingSlices: [],
        age: this.nextAge++
      };
      this.workers.push(worker);
      return worker;
    }
    runWorker(worker) {
      assert(!worker.running);
      assert(worker.currentPos < worker.targetPos);
      worker.running = true;
      worker.age = this.nextAge++;
      void this.options.runWorker(worker).catch((error) => {
        worker.running = false;
        if (worker.pendingSlices.length > 0) {
          worker.pendingSlices.forEach((x) => x.reject(error));
          worker.pendingSlices.length = 0;
        } else if (!worker.aborted && !this.disposed) {
          throw error;
        }
      }).finally(() => {
        if (worker.running) {
          return;
        }
        if (this.queuedReads.length > 0) {
          let oldestIndex = 0;
          for (let i = 1; i < this.queuedReads.length; i++) {
            const queuedRead2 = this.queuedReads[i];
            if (queuedRead2.age < this.queuedReads[oldestIndex].age) {
              oldestIndex = i;
            }
          }
          const queuedRead = this.queuedReads[oldestIndex];
          const newWorker = this.createWorker(
            queuedRead.hole.start,
            queuedRead.hole.end,
            queuedRead.strictTarget
          );
          if (!newWorker) {
            return;
          }
          this.queuedReads.splice(oldestIndex, 1);
          newWorker.pendingSlices = queuedRead.pendingSlices;
          this.runWorker(newWorker);
        }
      });
    }
    /** Called by a worker when it has read some data. */
    supplyWorkerData(worker, bytes2) {
      assert(!worker.aborted);
      const start = worker.currentPos;
      const end = start + bytes2.length;
      this.insertIntoCache({
        start,
        end,
        bytes: bytes2,
        view: toDataView(bytes2),
        age: this.nextAge++
      });
      worker.currentPos += bytes2.length;
      if (worker.currentPos > worker.targetPos) {
        worker.targetPos = worker.currentPos;
        this.checkQueuedReadsAgainstWorker(worker);
      }
      for (let i = 0; i < worker.pendingSlices.length; i++) {
        const pendingSlice = worker.pendingSlices[i];
        const clampedStart = Math.max(start, pendingSlice.start);
        const clampedEnd = Math.min(end, pendingSlice.start + pendingSlice.bytes.length);
        if (clampedStart < clampedEnd) {
          pendingSlice.bytes.set(
            bytes2.subarray(clampedStart - start, clampedEnd - start),
            clampedStart - pendingSlice.start
          );
        }
        for (let j = 0; j < pendingSlice.holes.length; j++) {
          const hole = pendingSlice.holes[j];
          if (start <= hole.start && end > hole.start) {
            hole.start = end;
          }
          if (hole.end <= hole.start) {
            pendingSlice.holes.splice(j, 1);
            j--;
          }
        }
        if (pendingSlice.holes.length === 0) {
          pendingSlice.resolve(pendingSlice.bytes);
          worker.pendingSlices.splice(i, 1);
          i--;
        }
      }
      for (let i = 0; i < this.workers.length; i++) {
        const otherWorker = this.workers[i];
        if (worker === otherWorker || otherWorker.running) {
          continue;
        }
        if (closedIntervalsOverlap(
          start,
          end,
          otherWorker.currentPos,
          otherWorker.targetPos
          // These should typically be equal when the worker's idle
        )) {
          this.workers.splice(i, 1);
          i--;
        }
      }
    }
    supplyFileSize(size) {
      assert(this.fileSize === null);
      this.fileSize = size;
      for (const worker of this.workers) {
        worker.targetPos = Math.min(worker.targetPos, size);
        worker.strictTarget = true;
        for (let i = 0; i < worker.pendingSlices.length; i++) {
          const pendingSlice = worker.pendingSlices[i];
          for (const hole of pendingSlice.holes) {
            if (hole.end > size) {
              pendingSlice.resolve(null);
              worker.pendingSlices.splice(i, 1);
              i--;
              break;
            }
          }
        }
      }
      for (let i = 0; i < this.queuedReads.length; i++) {
        const queuedRead = this.queuedReads[i];
        if (queuedRead.hole.start >= size) {
          for (const slice of queuedRead.pendingSlices) slice.resolve(null);
          this.queuedReads.splice(i, 1);
          i--;
        } else if (queuedRead.hole.end > size) {
          queuedRead.hole.end = size;
          queuedRead.strictTarget = true;
          for (let j = 0; j < queuedRead.pendingSlices.length; j++) {
            const slice = queuedRead.pendingSlices[j];
            if (slice.start >= size) {
              slice.resolve(null);
              queuedRead.pendingSlices.splice(j, 1);
              j--;
            }
          }
        }
      }
    }
    signalWorkerStoppedRunning(worker) {
      worker.running = false;
      if (!worker.aborted) {
        worker.pendingSlices.length = 0;
      }
    }
    /** Called when a worker reaches the end of the underlying data and must be cleaned up. */
    onWorkerFinished(worker) {
      const index = this.workers.indexOf(worker);
      assert(index !== -1);
      worker.running = false;
      this.workers.splice(index, 1);
      if (this.fileSize === null) {
        this.supplyFileSize(worker.currentPos);
      }
      for (const pendingSlice of worker.pendingSlices) {
        pendingSlice.resolve(null);
      }
    }
    insertIntoCache(entry) {
      if (this.options.maxCacheSize === 0) {
        return;
      }
      let insertionIndex = binarySearchLessOrEqual(this.cache, entry.start, (x) => x.start) + 1;
      if (insertionIndex > 0) {
        const previous = this.cache[insertionIndex - 1];
        if (previous.end >= entry.end) {
          return;
        }
        if (previous.end > entry.start) {
          const joined = new Uint8Array(entry.end - previous.start);
          joined.set(previous.bytes, 0);
          joined.set(entry.bytes, entry.start - previous.start);
          this.currentCacheSize += entry.end - previous.end;
          previous.bytes = joined;
          previous.view = toDataView(joined);
          previous.end = entry.end;
          insertionIndex--;
          entry = previous;
        } else {
          this.cache.splice(insertionIndex, 0, entry);
          this.currentCacheSize += entry.bytes.length;
        }
      } else {
        this.cache.splice(insertionIndex, 0, entry);
        this.currentCacheSize += entry.bytes.length;
      }
      for (let i = insertionIndex + 1; i < this.cache.length; i++) {
        const next = this.cache[i];
        if (entry.end <= next.start) {
          break;
        }
        if (entry.end >= next.end) {
          this.cache.splice(i, 1);
          this.currentCacheSize -= next.bytes.length;
          i--;
          continue;
        }
        const joined = new Uint8Array(next.end - entry.start);
        joined.set(entry.bytes, 0);
        joined.set(next.bytes, next.start - entry.start);
        this.currentCacheSize -= entry.end - next.start;
        entry.bytes = joined;
        entry.view = toDataView(joined);
        entry.end = next.end;
        this.cache.splice(i, 1);
        break;
      }
      while (this.currentCacheSize > this.options.maxCacheSize) {
        let oldestIndex = 0;
        let oldestEntry = this.cache[0];
        for (let i = 1; i < this.cache.length; i++) {
          const entry2 = this.cache[i];
          if (entry2.age < oldestEntry.age) {
            oldestIndex = i;
            oldestEntry = entry2;
          }
        }
        if (this.currentCacheSize - oldestEntry.bytes.length <= this.options.maxCacheSize) {
          break;
        }
        this.cache.splice(oldestIndex, 1);
        this.currentCacheSize -= oldestEntry.bytes.length;
      }
    }
    dispose() {
      for (const worker of this.workers) {
        for (const slice of worker.pendingSlices) {
          slice.reject(new InputDisposedError());
        }
        worker.pendingSlices.length = 0;
        worker.aborted = true;
      }
      for (const queuedRead of this.queuedReads) {
        for (const slice of queuedRead.pendingSlices) {
          slice.reject(new InputDisposedError());
        }
      }
      this.workers.length = 0;
      this.cache.length = 0;
      this.queuedReads.length = 0;
      this.disposed = true;
    }
  };
  var RangedSource = class extends Source {
    /** @internal */
    constructor(baseSource, offset, length) {
      super();
      /** @internal */
      this._ref = null;
      if (baseSource._disposed) {
        throw new Error("Cannot create a slice of a disposed source.");
      }
      this._baseSource = baseSource;
      this._offset = offset;
      this._length = length ?? null;
    }
    /** @internal */
    _getFileSize() {
      const baseSize = this._baseSource._getFileSize();
      if (baseSize === void 0) {
        return this._length !== null ? this._length : void 0;
      }
      if (baseSize === null) {
        if (this._length !== null) {
          return this._length;
        } else {
          return null;
        }
      }
      return clamp(baseSize - this._offset, 0, this._length ?? Infinity);
    }
    /** @internal */
    _read(start, end, minReadPosition, maxReadPosition) {
      if (this._length !== null && end > this._length) {
        return null;
      }
      const result = this._baseSource._read(
        this._offset + start,
        this._offset + end,
        this._offset + minReadPosition,
        this._offset + maxReadPosition
      );
      const processResult = (result2) => {
        if (!result2) {
          return null;
        }
        result2.offset -= this._offset;
        return result2;
      };
      if (result instanceof Promise) {
        return result.then(processResult);
      } else {
        return processResult(result);
      }
    }
    /** @internal */
    _dispose() {
      this._ref?.free();
    }
    ref() {
      this._ref ??= this._baseSource.ref();
      return super.ref();
    }
  };

  // src/hls/hls-segmented-input.ts
  var IV_STRING_REGEX = /^0[xX][0-9a-fA-F]+$/;
  var BASE64_DATA_URI_REGEX = /^data:.*;base64,/i;
  var HlsSegmentedInput = class extends SegmentedInput {
    // Reasonable default in case the playlist doesn't specify it
    constructor(demuxer, path, trackDeclarations, lines) {
      super(demuxer.input, path, trackDeclarations);
      this.segments = [];
      this.nextLines = null;
      this.currentUpdateSegmentsPromise = null;
      this.streamHasEnded = false;
      this.lastSegmentUpdateTime = -Infinity;
      this.refreshInterval = 5;
      this.rootPath = path;
      this.demuxer = demuxer;
      this.nextLines = lines;
    }
    runUpdateSegments() {
      return this.currentUpdateSegmentsPromise ??= (async () => {
        try {
          const remainingWaitTimeMs = this.getRemainingWaitTimeMs();
          if (remainingWaitTimeMs > 0) {
            await wait(remainingWaitTimeMs);
          }
          this.lastSegmentUpdateTime = performance.now();
          await this.updateSegments();
        } finally {
          this.currentUpdateSegmentsPromise = null;
        }
      })();
    }
    getRemainingWaitTimeMs() {
      const elapsed = performance.now() - this.lastSegmentUpdateTime;
      const result = Math.max(0, 1e3 * this.refreshInterval - elapsed);
      if (result <= 50) {
        return 0;
      }
      return result;
    }
    /**
     * Reads and parses the segment info from the playlist file. When called more than one, it updates the existing
     * segments by appending the new ones. Existing segments are never removed.
     */
    async updateSegments() {
      let lines = this.nextLines;
      this.nextLines = null;
      if (!lines) {
        var _stack = [];
        try {
          const ref = __using(_stack, await this.demuxer.input._getSourceUncached({ path: this.rootPath, isRoot: false }));
          const reader = new Reader12(ref.source);
          const slice = await reader.requestEntireFile();
          assert(slice);
          lines = readAllLines(slice, slice.length, { ignore: canIgnoreLine });
          if (ref.source instanceof PathedSource) {
            this.rootPath = ref.source.rootPath;
          }
        } catch (_) {
          var _error = _, _hasError = true;
        } finally {
          __callDispose(_stack, _error, _hasError);
        }
      }
      const offsetTimestampsByDateTime = this.input._formatOptions.hls?.offsetTimestampsByDateTime !== false;
      let headerRead = false;
      let accumulatedTime = 0;
      let accumulatedUnixTime = null;
      let nextSegmentDuration = null;
      let currentKey = null;
      let nextSequenceNumber = 0;
      let currentFirstSegment = null;
      let currentInitSegment = null;
      let lastByteRangeEnd = null;
      let nextByteRange = null;
      let lastProgramDateTimeSeconds = null;
      let targetDuration = null;
      let segmentSeen = false;
      let prevLastSegment = last(this.segments) ?? null;
      const parseByteRange = (content) => {
        const atIndex = content.indexOf("@");
        const length = Number(atIndex === -1 ? content : content.slice(0, atIndex));
        if (!Number.isInteger(length) || length < 0) {
          throw new Error(`Invalid #EXT-X-BYTERANGE length '${content}'.`);
        }
        let offset = null;
        if (atIndex !== -1) {
          offset = Number(content.slice(atIndex + 1));
          if (!Number.isInteger(offset) || offset < 0) {
            throw new Error(`Invalid #EXT-X-BYTERANGE offset '${content}'.`);
          }
        }
        return { length, offset };
      };
      const setNextSequenceNumber = (number) => {
        nextSequenceNumber = number;
        if (prevLastSegment) {
          assert(prevLastSegment.sequenceNumber !== null);
          if (prevLastSegment.sequenceNumber < number) {
            accumulatedTime = prevLastSegment.timestamp + prevLastSegment.duration;
            currentFirstSegment = prevLastSegment.firstSegment;
            currentInitSegment = prevLastSegment.initSegment;
            lastProgramDateTimeSeconds = prevLastSegment.lastProgramDateTimeSeconds;
            accumulatedUnixTime = prevLastSegment.unixEpochTimestamp !== null ? prevLastSegment.unixEpochTimestamp + prevLastSegment.duration : null;
            prevLastSegment = null;
          }
        }
      };
      for (let i = 0; i < lines.length; i++) {
        const line = lines[i];
        if (!headerRead) {
          if (line !== "#EXTM3U") {
            throw new Error("Invalid M3U8 file; expected first line to be #EXTM3U.");
          }
          headerRead = true;
          continue;
        }
        if (!line.startsWith("#")) {
          if (!prevLastSegment) {
            if (nextSegmentDuration === null) {
              throw new Error("Invalid M3U8 file; a segment must be preceded by an #EXTINF tag.");
            }
            let key = currentKey;
            if (key && key.method === "AES-128" && !key.iv) {
              const iv = new Uint8Array(AES_128_BLOCK_SIZE);
              const view2 = toDataView(iv);
              view2.setUint32(8, Math.floor(nextSequenceNumber / 2 ** 32));
              view2.setUint32(12, nextSequenceNumber);
              key = { ...key, iv };
            }
            const fullPath = joinPaths(this.rootPath, line);
            const location = {
              path: fullPath,
              offset: nextByteRange?.offset ?? 0,
              length: nextByteRange?.length ?? null
            };
            const segment = {
              timestamp: accumulatedTime,
              unixEpochTimestamp: accumulatedUnixTime,
              firstSegment: currentFirstSegment,
              sequenceNumber: nextSequenceNumber,
              location,
              duration: nextSegmentDuration,
              encryption: key,
              initSegment: currentInitSegment,
              lastProgramDateTimeSeconds
            };
            currentFirstSegment ??= segment;
            accumulatedTime += nextSegmentDuration;
            if (accumulatedUnixTime !== null) {
              accumulatedUnixTime += nextSegmentDuration;
            }
            this.segments.push(segment);
          } else {
          }
          nextSegmentDuration = null;
          if (nextByteRange === null) {
            lastByteRangeEnd = null;
          } else {
            nextByteRange = null;
          }
          setNextSequenceNumber(nextSequenceNumber + 1);
        }
        if (line.startsWith(TAG_EXTINF)) {
          if (prevLastSegment) {
            segmentSeen = true;
            continue;
          }
          if (!segmentSeen) {
            if (lastProgramDateTimeSeconds === null && nextSequenceNumber > 0 && targetDuration !== null) {
              accumulatedTime = nextSequenceNumber * targetDuration;
            }
            segmentSeen = true;
          }
          const extinfContent = line.slice(TAG_EXTINF.length);
          const commaIndex = extinfContent.indexOf(",");
          const durationStr = commaIndex === -1 ? extinfContent : extinfContent.slice(0, commaIndex);
          const duration = Number(durationStr);
          if (!Number.isFinite(duration) || duration < 0) {
            throw new Error(`Invalid #EXTINF tag duration '${durationStr}'.`);
          }
          nextSegmentDuration = duration;
        } else if (line.startsWith(TAG_MAP)) {
          const attributes = new AttributeList(line.slice(TAG_MAP.length));
          const uri = attributes.get("uri");
          if (!uri) {
            throw new Error("Invalid #EXT-X-MAP tag; missing URI attribute.");
          }
          const byteRange = attributes.get("byterange");
          let parsedByteRange = null;
          if (byteRange !== null) {
            parsedByteRange = parseByteRange(byteRange);
          }
          if (parsedByteRange && parsedByteRange.offset === null) {
            throw new Error("Invalid #EXT-X-MAP tag; BYTERANGE attribute must have a specified offset.");
          }
          if (!prevLastSegment) {
            const fullPath = joinPaths(this.rootPath, uri);
            const location = {
              path: fullPath,
              offset: parsedByteRange?.offset ?? 0,
              length: parsedByteRange?.length ?? null
            };
            if (currentKey?.method === "AES-128" && !currentKey.iv) {
              throw new Error("IV attribute must be set on #EXT-X-KEY tag preceding the #EXT-X-MAP tag.");
            }
            const segment = {
              timestamp: accumulatedTime,
              unixEpochTimestamp: accumulatedUnixTime,
              firstSegment: null,
              sequenceNumber: null,
              location,
              duration: 0,
              encryption: currentKey,
              initSegment: null,
              lastProgramDateTimeSeconds
            };
            currentInitSegment = segment;
          } else {
          }
          nextSegmentDuration = null;
          if (nextByteRange === null) {
            lastByteRangeEnd = null;
          } else {
            nextByteRange = null;
          }
        } else if (line.startsWith(TAG_KEY)) {
          const attributes = new AttributeList(line.slice(TAG_KEY.length));
          const method = attributes.get("method");
          if (method === "NONE") {
            currentKey = null;
          } else if (method === "AES-128") {
            const uri = attributes.get("uri");
            if (!uri) {
              throw new Error("Invalid #EXT-X-KEY: AES-128 requires a URI attribute.");
            }
            let iv = null;
            const ivString = attributes.get("iv");
            if (ivString) {
              if (!IV_STRING_REGEX.test(ivString)) {
                throw new Error(`Unsupported IV format '${ivString}'.`);
              }
              let hex = ivString.slice(2);
              hex = hex.padStart(AES_128_BLOCK_SIZE * 2, "0");
              iv = new Uint8Array(AES_128_BLOCK_SIZE);
              for (let i2 = 0; i2 < AES_128_BLOCK_SIZE; i2++) {
                const startIndex = -AES_128_BLOCK_SIZE * 2 + i2;
                iv[i2] = parseInt(hex.slice(startIndex, startIndex + 2), 16);
              }
            }
            const keyFormat = attributes.get("keyformat") ?? "identity";
            if (keyFormat !== "identity") {
              throw new Error(
                "For AES-128 encryption, only the 'identity' KEYFORMAT is currently supported. If you think other formats should be supported, please raise an issue."
              );
            }
            currentKey = {
              method: "AES-128",
              keyUri: joinPaths(this.rootPath, uri),
              iv,
              keyFormat
            };
          } else if (method === "SAMPLE-AES" || method === "SAMPLE-AES-CTR") {
            const uri = attributes.get("uri");
            if (!uri) {
              throw new Error(`Invalid #EXT-X-KEY: ${method} requires a URI attribute.`);
            }
            const keyFormat = attributes.get("keyformat") ?? "identity";
            if (keyFormat === "identity") {
              throw new Error(
                "For SAMPLE-AES and SAMPLE-AES-CTR encryption, the 'identity' KEYFORMAT is not supported. If you think this format should be supported, please raise an issue."
              );
            }
            let psshBox = null;
            if (BASE64_DATA_URI_REGEX.test(uri)) {
              const commaIndex = uri.indexOf(",");
              const bytes2 = base64ToBytes(uri.slice(commaIndex + 1));
              if (bytes2.length >= 8 && bytes2[4] === 112 && bytes2[5] === 115 && bytes2[6] === 115 && bytes2[7] === 104) {
                const size = toDataView(bytes2).getUint32(0);
                psshBox = parsePsshBoxContents(bytes2.subarray(8, Math.min(size, bytes2.length)));
              }
            }
            currentKey = {
              method,
              psshBox
            };
          } else {
            throw new Error(
              `Unsupported encryption method '${method}'. If you think this method should be supported, please raise an issue.`
            );
          }
        } else if (line.startsWith(TAG_MEDIA_SEQUENCE)) {
          const value = line.slice(TAG_MEDIA_SEQUENCE.length);
          const number = Number(value);
          if (!Number.isInteger(number) || number < 0) {
            throw new Error(`Invalid EXT-X-MEDIA-SEQUENCE value '${value}'.`);
          }
          setNextSequenceNumber(number);
        } else if (line.startsWith(TAG_BYTERANGE)) {
          const parsed = parseByteRange(line.slice(TAG_BYTERANGE.length));
          if (parsed.offset === null) {
            if (lastByteRangeEnd === null) {
              throw new Error(
                "Invalid M3U8 file; #EXT-X-BYTERANGE without offset requires a previous byte range."
              );
            }
            parsed.offset = lastByteRangeEnd;
          }
          nextByteRange = parsed;
          lastByteRangeEnd = parsed.offset + parsed.length;
        } else if (line.startsWith(TAG_PROGRAM_DATE_TIME)) {
          if (prevLastSegment) {
            continue;
          }
          const dateTime = line.slice(TAG_PROGRAM_DATE_TIME.length);
          const dateTimeMs = Date.parse(dateTime);
          if (!Number.isFinite(dateTimeMs)) {
            continue;
          }
          const dateTimeSeconds = dateTimeMs / 1e3;
          if (lastProgramDateTimeSeconds === dateTimeSeconds) {
            continue;
          }
          if (lastProgramDateTimeSeconds === null && this.segments.length > 0) {
            const lastSegment = last(this.segments);
            const lastSegmentEnd = lastSegment.timestamp + lastSegment.duration;
            const offset = dateTimeSeconds - lastSegmentEnd;
            for (const segment of this.segments) {
              segment.unixEpochTimestamp = segment.timestamp + offset;
              if (offsetTimestampsByDateTime) {
                segment.timestamp = segment.unixEpochTimestamp;
              }
            }
          }
          lastProgramDateTimeSeconds = dateTimeSeconds;
          accumulatedUnixTime = dateTimeSeconds;
          if (offsetTimestampsByDateTime) {
            accumulatedTime = dateTimeSeconds;
          }
        } else if (line === TAG_DISCONTINUITY) {
          currentFirstSegment = null;
        } else if (line.startsWith(TAG_TARGETDURATION)) {
          const value = line.slice(TAG_TARGETDURATION.length);
          const duration = Number(value);
          if (!Number.isFinite(duration) || duration < 0) {
            throw new Error(`Invalid EXT-X-TARGETDURATION value '${value}'.`);
          }
          this.refreshInterval = duration;
          targetDuration = duration;
        } else if (line === TAG_ENDLIST) {
          this.streamHasEnded = true;
          break;
        } else if (line.startsWith(TAG_PLAYLIST_TYPE)) {
          const type = line.slice(TAG_PLAYLIST_TYPE.length);
          if (type.toLowerCase() === "vod") {
            this.streamHasEnded = true;
          }
        }
      }
      if (!headerRead) {
        throw new Error("Invalid M3U8 file; no #EXTM3U header.");
      }
    }
    async getFirstSegment() {
      if (this.segments.length === 0) {
        await this.runUpdateSegments();
      }
      return this.segments[0] ?? null;
    }
    async getSegmentAt(timestamp, options) {
      if (this.segments.length === 0) {
        await this.runUpdateSegments();
      }
      let isLazy = !!options.skipLiveWait && this.getRemainingWaitTimeMs() > 0;
      while (true) {
        const index = binarySearchLessOrEqual(this.segments, timestamp, (x) => x.timestamp);
        if (index === -1) {
          return null;
        }
        if (index < this.segments.length - 1 || this.streamHasEnded || isLazy) {
          return this.segments[index];
        }
        const segment = this.segments[index];
        if (timestamp < segment.timestamp + segment.duration) {
          return segment;
        }
        await this.runUpdateSegments();
        if (options.skipLiveWait) {
          isLazy = true;
        }
      }
    }
    async getNextSegment(segment, options) {
      const index = this.segments.indexOf(segment);
      assert(index !== -1);
      const nextIndex = index + 1;
      let isLazy = !!options.skipLiveWait && this.getRemainingWaitTimeMs() > 0;
      while (true) {
        if (nextIndex < this.segments.length) {
          return this.segments[nextIndex];
        }
        if (this.streamHasEnded || isLazy) {
          return null;
        }
        await this.runUpdateSegments();
        if (options.skipLiveWait) {
          isLazy = true;
        }
      }
    }
    async getPreviousSegment(segment) {
      const index = this.segments.indexOf(segment);
      assert(index !== -1);
      return this.segments[index - 1] ?? null;
    }
    getInputForSegment(segment) {
      const hlsSegment = segment;
      const cacheEntry = this.inputCache.find((x) => x.segment === hlsSegment);
      if (cacheEntry) {
        cacheEntry.age = this.nextInputCacheAge++;
        return cacheEntry.input;
      }
      let initInput = null;
      if (hlsSegment.initSegment || hlsSegment.firstSegment) {
        initInput = this.getInputForSegment(hlsSegment.initSegment ?? hlsSegment.firstSegment);
      }
      const formatOptions = {
        ...this.input._formatOptions,
        isobmff: {
          ...this.input._formatOptions.isobmff,
          // Intercept calls to resolveKeyId to inject our psshBox knowledge into it
          resolveKeyId: this.input._formatOptions.isobmff?.resolveKeyId && ((options) => {
            if (!hlsSegment.encryption || !(hlsSegment.encryption.method === "SAMPLE-AES" || hlsSegment.encryption.method === "SAMPLE-AES-CTR") || !hlsSegment.encryption.psshBox) {
              return this.input._formatOptions.isobmff.resolveKeyId(options);
            }
            let psshBoxes = options.psshBoxes;
            const { psshBox } = hlsSegment.encryption;
            if ((psshBox.keyIds === null || psshBox.keyIds.includes(options.keyId)) && !psshBoxes.some((x) => psshBoxesAreEqual(x, psshBox))) {
              psshBoxes = [...psshBoxes, psshBox];
            }
            return this.input._formatOptions.isobmff.resolveKeyId({ ...options, psshBoxes });
          })
        }
      };
      const input = new Input({
        source: new CustomPathedSource(
          hlsSegment.location.path,
          async (request) => {
            assert(request.isRoot);
            const proxiedRequest = {
              ...request,
              isRoot: false
            };
            let ref;
            const needsSlice = hlsSegment.location.offset > 0 || hlsSegment.location.length !== null;
            if (!hlsSegment.encryption || hlsSegment.encryption.method === "SAMPLE-AES" || hlsSegment.encryption.method === "SAMPLE-AES-CTR") {
              ref = await this.input._getSourceCached(proxiedRequest);
              if (needsSlice) {
                const slice = ref.source.slice(
                  hlsSegment.location.offset,
                  hlsSegment.location.length ?? void 0
                );
                const sliceRef = slice.ref();
                ref.free();
                ref = sliceRef;
              }
            } else if (hlsSegment.encryption.method === "AES-128") {
              const encryption = hlsSegment.encryption;
              assert(encryption.iv);
              let ciphertextRef = await this.input._getSourceCached(proxiedRequest);
              if (needsSlice) {
                const slice = ciphertextRef.source.slice(
                  hlsSegment.location.offset,
                  hlsSegment.location.length ?? void 0
                );
                const sliceRef = slice.ref();
                ciphertextRef.free();
                ciphertextRef = sliceRef;
              }
              const ciphertextReader = new Reader12(ciphertextRef.source);
              const stream = createAes128CbcDecryptStream(ciphertextReader, async () => {
                var _stack = [];
                try {
                  const keyRef = __using(_stack, await this.input._getSourceCached(
                    { path: encryption.keyUri, isRoot: false },
                    ENCRYPTION_KEY_CACHE_GROUP
                  ));
                  const keyReader = new Reader12(keyRef.source);
                  const keySlice = await keyReader.requestSlice(0, AES_128_BLOCK_SIZE);
                  if (!keySlice) {
                    throw new Error("Invalid AES-128 key; expected at least 16 bytes of data.");
                  }
                  const key = readBytes(keySlice, AES_128_BLOCK_SIZE);
                  return { key, iv: encryption.iv };
                } catch (_) {
                  var _error = _, _hasError = true;
                } finally {
                  __callDispose(_stack, _error, _hasError);
                }
              }, () => {
                ciphertextRef.free();
              });
              ref = new ReadableStreamSource(stream).ref();
            } else {
              assert(false);
            }
            return ref;
          }
        ),
        // Do not allow recursive HLS. Cool on paper, but allows for nasty infinite-depth request trees.
        formats: this.input._formats.filter((x) => !(x instanceof HlsInputFormat)),
        initInput: initInput ?? void 0,
        formatOptions
      });
      input._onFormatDetermined = (format) => {
        if ((hlsSegment.encryption?.method === "SAMPLE-AES" || hlsSegment.encryption?.method === "SAMPLE-AES-CTR") && !format._isIsobmff) {
          throw new Error(
            "The SAMPLE-AES and SAMPLE-AES-CTR encryption methods are currently only supported for ISOBMFF files."
          );
        }
      };
      this.inputCache.push({
        segment: hlsSegment,
        input,
        age: this.nextInputCacheAge++
      });
      const MAX_INPUT_CACHE_SIZE = 4;
      if (this.inputCache.length > MAX_INPUT_CACHE_SIZE) {
        const minAgeIndex = arrayArgmin(this.inputCache, (x) => x.age);
        assert(minAgeIndex !== -1);
        this.inputCache.splice(minAgeIndex, 1);
      }
      return input;
    }
    async getLiveRefreshInterval() {
      if (this.getRemainingWaitTimeMs() === 0) {
        await this.runUpdateSegments();
      }
      return this.streamHasEnded ? null : this.refreshInterval;
    }
  };

  // src/hls/hls-demuxer.ts
  var HlsDemuxer = class extends Demuxer {
    constructor(input) {
      super(input);
      this.metadataPromise = null;
      this.trackBackings = null;
      this.internalTracks = null;
      this.segmentedInputs = [];
      this.hasMasterPlaylist = true;
    }
    readMetadata() {
      return this.metadataPromise ??= (async () => {
        assert(this.input._rootSource instanceof PathedSource);
        const slice = await this.input._reader.requestEntireFile();
        assert(slice);
        const lines = readAllLines(slice, slice.length, { ignore: canIgnoreLine });
        const { rootPath } = this.input._rootSource;
        const variantStreams = [];
        const mediaTags = [];
        for (let i = 1; i < lines.length; i++) {
          const line = lines[i];
          if (line.startsWith(TAG_STREAM_INF)) {
            const streamInfLineNumber = i;
            const playlistPath = lines[++i];
            if (playlistPath === void 0) {
              throw new Error("Incorrect M3U8 file; a line must follow the #EXT-X-STREAM-INF tag.");
            }
            const fullPath = joinPaths(rootPath, playlistPath);
            const attributes = new AttributeList(line.slice(TAG_STREAM_INF.length));
            const bandwidth = attributes.getAsNumber("bandwidth");
            if (bandwidth === null) {
              throw new Error(
                "Invalid M3U8 file; #EXT-X-STREAM-INF tag requires a BANDWIDTH attribute with a valid numerical value."
              );
            }
            variantStreams.push({
              fullPath,
              attributes,
              lineNumber: streamInfLineNumber,
              hasOnlyKeyPackets: false
            });
          } else if (line.startsWith(TAG_I_FRAME_STREAM_INF)) {
            const attributes = new AttributeList(line.slice(TAG_I_FRAME_STREAM_INF.length));
            const playlistPath = attributes.get("uri");
            if (playlistPath === null) {
              throw new Error(
                "Invalid M3U8 file; #EXT-X-I-FRAME-STREAM-INF tag requires a URI attribute."
              );
            }
            const bandwidth = attributes.getAsNumber("bandwidth");
            if (bandwidth === null) {
              throw new Error(
                "Invalid M3U8 file; #EXT-X-I-FRAME-STREAM-INF tag requires a BANDWIDTH attribute with a valid numerical value."
              );
            }
            const fullPath = joinPaths(rootPath, playlistPath);
            variantStreams.push({
              fullPath,
              attributes,
              lineNumber: i,
              hasOnlyKeyPackets: true
            });
          } else if (line.startsWith(TAG_MEDIA)) {
            const attributes = new AttributeList(line.slice(TAG_MEDIA.length));
            const type = attributes.get("type");
            if (type === null) {
              throw new Error(
                "Invalid M3U8 file; #EXT-X-MEDIA tag requires a TYPE attribute."
              );
            }
            const groupId = attributes.get("group-id");
            if (groupId === null) {
              throw new Error(
                "Invalid M3U8 file; #EXT-X-MEDIA tag requires a GROUP-ID attribute."
              );
            }
            let fullPath = null;
            const uri = attributes.get("uri");
            if (uri !== null) {
              fullPath = joinPaths(rootPath, uri);
            }
            mediaTags.push({ fullPath, attributes, lineNumber: i });
          } else if (line === TAG_I_FRAMES_ONLY) {
          } else if (line.startsWith(TAG_EXTINF)) {
            const segmentedInput = new HlsSegmentedInput(this, rootPath, null, lines);
            this.segmentedInputs = [segmentedInput];
            this.hasMasterPlaylist = false;
            this.trackBackings = await segmentedInput.getTrackBackings();
            return;
          }
        }
        const videoGroupIds = [
          ...new Set(
            mediaTags.filter((tag) => tag.attributes.get("type").toLowerCase() === "video").map((tag) => tag.attributes.get("group-id"))
          )
        ];
        const audioGroupIds = [
          ...new Set(
            mediaTags.filter((tag) => tag.attributes.get("type").toLowerCase() === "audio").map((tag) => tag.attributes.get("group-id"))
          )
        ];
        const internalTracksByVariant = await Promise.all(variantStreams.map(async (variantStream, i) => {
          const result = [];
          const codecsList = variantStream.attributes.get("codecs");
          let codecStrings;
          if (codecsList) {
            codecStrings = codecsList.split(",").map((x) => x.trim());
          } else {
            const segmentedInput = this.getSegmentedInputForPath(variantStream.fullPath);
            const trackBackings = await segmentedInput.getTrackBackings();
            const tracksWithCodec = await Promise.all(
              trackBackings.map(async (t) => ({ track: t, codec: await t.getCodec() }))
            );
            codecStrings = await Promise.all(
              tracksWithCodec.filter((x) => x.codec !== null).map((x) => x.track.getDecoderConfig().then((x2) => x2.codec))
            );
          }
          const videoGroupId = variantStream.attributes.get("video");
          const audioGroupId = variantStream.attributes.get("audio");
          const containsVideoCodecs = codecStrings.some(
            (x) => VIDEO_CODECS.includes(inferCodecFromCodecString(x))
          );
          const containsAudioCodecs = codecStrings.some(
            (x) => AUDIO_CODECS.includes(inferCodecFromCodecString(x))
          );
          if (videoGroupId !== null && !containsVideoCodecs) {
            if (!videoGroupIds.includes(videoGroupId)) {
              throw new Error(
                `Invalid M3U8 file; variant stream references video group "${videoGroupId}" which is not defined in any #EXT-X-MEDIA tags.`
              );
            }
            const matchingVideoMediaTag = mediaTags.find((mediaTag) => {
              const groupId = mediaTag.attributes.get("group-id");
              const type = mediaTag.attributes.get("type");
              return groupId === videoGroupId && type.toLowerCase() === "video";
            });
            outer:
              if (matchingVideoMediaTag) {
                const uri = matchingVideoMediaTag.attributes.get("uri");
                if (uri === null) {
                  break outer;
                }
                const fullPath = joinPaths(rootPath, uri);
                const segmentedInput = this.getSegmentedInputForPath(fullPath);
                const trackBackings = await segmentedInput.getTrackBackings();
                const videoTrack = trackBackings.find((x) => x.getType() === "video");
                if (!videoTrack || await videoTrack.getCodec() === null) {
                  break outer;
                }
                const additionalCodecString = await videoTrack.getDecoderConfig().then((x) => x?.codec ?? null);
                assert(additionalCodecString !== null);
                codecStrings.push(additionalCodecString);
              }
          }
          if (audioGroupId !== null && !containsAudioCodecs) {
            if (!audioGroupIds.includes(audioGroupId)) {
              throw new Error(
                `Invalid M3U8 file; variant stream references audio group "${audioGroupId}" which is not defined in any #EXT-X-MEDIA tags.`
              );
            }
            const matchingAudioMediaTag = mediaTags.find((tag) => {
              const groupId = tag.attributes.get("group-id");
              const type = tag.attributes.get("type");
              return groupId === audioGroupId && type.toLowerCase() === "audio";
            });
            outer:
              if (matchingAudioMediaTag) {
                const uri = matchingAudioMediaTag.attributes.get("uri");
                if (uri === null) {
                  break outer;
                }
                const fullPath = joinPaths(rootPath, uri);
                const segmentedInput = this.getSegmentedInputForPath(fullPath);
                const trackBackings = await segmentedInput.getTrackBackings();
                const audioTrack = trackBackings.find((x) => x.getType() === "audio");
                if (!audioTrack || await audioTrack.getCodec() === null) {
                  break outer;
                }
                const additionalCodecString = await audioTrack.getDecoderConfig().then((x) => x?.codec ?? null);
                assert(additionalCodecString !== null);
                codecStrings.push(additionalCodecString);
              }
          }
          codecStrings = [...new Set(codecStrings)];
          let videoCodecString = null;
          let audioCodecString = null;
          const bandwidth = variantStream.attributes.getAsNumber("bandwidth");
          assert(bandwidth !== null);
          const averageBandwidth = variantStream.attributes.getAsNumber("average-bandwidth");
          const name = variantStream.attributes.get("name");
          for (const codecString of codecStrings) {
            const inferredCodec = inferCodecFromCodecString(codecString);
            if (inferredCodec === null) {
              continue;
            }
            if (VIDEO_CODECS.includes(inferredCodec)) {
              if (videoCodecString !== null) {
                throw new Error(
                  "Unsupported M3U8 file; multiple video codecs found in the CODECS attribute of a variant stream."
                );
              }
              videoCodecString = codecString;
              const videoGroupId2 = variantStream.attributes.get("video");
              if (videoGroupId2 === null) {
                const resolution = variantStream.attributes.get("resolution");
                let width = null;
                let height = null;
                if (resolution) {
                  const match = resolution.match(/^(\d+)x(\d+)$/);
                  if (match) {
                    width = Number(match[1]);
                    height = Number(match[2]);
                  }
                }
                result.push({
                  id: -1,
                  demuxer: this,
                  backingTrack: null,
                  default: true,
                  autoselect: true,
                  languageCode: UNDETERMINED_LANGUAGE,
                  lineNumber: variantStream.lineNumber,
                  fullPath: variantStream.fullPath,
                  fullCodecString: videoCodecString,
                  pairingMask: 1n << BigInt(i),
                  peakBitrate: bandwidth,
                  averageBitrate: averageBandwidth,
                  name,
                  hasOnlyKeyPackets: variantStream.hasOnlyKeyPackets,
                  info: {
                    type: "video",
                    width,
                    height
                  }
                });
              } else {
                if (!videoGroupIds.includes(videoGroupId2)) {
                  throw new Error(
                    `Invalid M3U8 file; variant stream references video group "${videoGroupId2}" which is not defined in any #EXT-X-MEDIA tags.`
                  );
                }
                for (const mediaTag of mediaTags) {
                  const groupId = mediaTag.attributes.get("group-id");
                  const type = mediaTag.attributes.get("type");
                  if (groupId !== videoGroupId2 || type.toLowerCase() !== "video") {
                    continue;
                  }
                  const resolution = mediaTag.attributes.get("resolution") ?? variantStream.attributes.get("resolution");
                  let width = null;
                  let height = null;
                  if (resolution) {
                    const match = resolution.match(/^(\d+)x(\d+)$/);
                    if (match) {
                      width = Number(match[1]);
                      height = Number(match[2]);
                    }
                  }
                  result.push({
                    id: -1,
                    demuxer: this,
                    backingTrack: null,
                    default: getMediaTagDefault(mediaTag.attributes),
                    // Autoselect is inferred to be true if the default is true
                    autoselect: getMediaTagDefault(mediaTag.attributes) || getMediaTagAutoselect(mediaTag.attributes),
                    languageCode: preprocessLanguageCode(mediaTag.attributes.get("language")),
                    lineNumber: mediaTag.lineNumber,
                    fullPath: mediaTag.fullPath ?? variantStream.fullPath,
                    fullCodecString: videoCodecString,
                    pairingMask: 1n << BigInt(i),
                    peakBitrate: null,
                    averageBitrate: null,
                    name: mediaTag.attributes.get("name"),
                    hasOnlyKeyPackets: variantStream.hasOnlyKeyPackets,
                    info: {
                      type: "video",
                      width,
                      height
                    }
                  });
                }
              }
            } else if (AUDIO_CODECS.includes(inferredCodec)) {
              if (audioCodecString !== null) {
                throw new Error(
                  "Unsupported M3U8 file; multiple audio codecs found in the CODECS attribute of a variant stream."
                );
              }
              audioCodecString = codecString;
              const audioGroupId2 = variantStream.attributes.get("audio");
              if (audioGroupId2 === null) {
                const channels = variantStream.attributes.get("channels");
                const parsedChannels = channels !== null ? Number(channels.split("/")[0]) : null;
                result.push({
                  id: -1,
                  demuxer: this,
                  backingTrack: null,
                  default: true,
                  autoselect: true,
                  languageCode: UNDETERMINED_LANGUAGE,
                  lineNumber: variantStream.lineNumber,
                  fullPath: variantStream.fullPath,
                  fullCodecString: audioCodecString,
                  pairingMask: 1n << BigInt(i),
                  peakBitrate: bandwidth,
                  averageBitrate: averageBandwidth,
                  name,
                  hasOnlyKeyPackets: variantStream.hasOnlyKeyPackets,
                  info: {
                    type: "audio",
                    numberOfChannels: parsedChannels !== null && Number.isInteger(parsedChannels) && parsedChannels > 0 ? parsedChannels : null
                  }
                });
              } else {
                if (!audioGroupIds.includes(audioGroupId2)) {
                  throw new Error(
                    `Invalid M3U8 file; variant stream references audio group "${audioGroupId2}" which is not defined in any #EXT-X-MEDIA tags.`
                  );
                }
                for (const mediaTag of mediaTags) {
                  const groupId = mediaTag.attributes.get("group-id");
                  const type = mediaTag.attributes.get("type");
                  if (groupId !== audioGroupId2 || type.toLowerCase() !== "audio") {
                    continue;
                  }
                  const channels = mediaTag.attributes.get("channels") ?? variantStream.attributes.get("channels");
                  const parsedChannels = channels !== null ? Number(channels.split("/")[0]) : null;
                  result.push({
                    id: -1,
                    demuxer: this,
                    backingTrack: null,
                    default: getMediaTagDefault(mediaTag.attributes),
                    // Autoselect is inferred to be true if the default is true
                    autoselect: getMediaTagDefault(mediaTag.attributes) || getMediaTagAutoselect(mediaTag.attributes),
                    languageCode: preprocessLanguageCode(mediaTag.attributes.get("language")),
                    lineNumber: mediaTag.lineNumber,
                    fullPath: mediaTag.fullPath ?? variantStream.fullPath,
                    fullCodecString: audioCodecString,
                    pairingMask: 1n << BigInt(i),
                    peakBitrate: null,
                    averageBitrate: null,
                    name: mediaTag.attributes.get("name"),
                    hasOnlyKeyPackets: variantStream.hasOnlyKeyPackets,
                    info: {
                      type: "audio",
                      numberOfChannels: parsedChannels !== null && Number.isInteger(parsedChannels) && parsedChannels > 0 ? parsedChannels : null
                    }
                  });
                }
              }
            }
          }
          return result;
        }));
        const internalTracks = [];
        const addInternalTrack = (track) => {
          const existingTrack = internalTracks.find(
            (x) => x.fullPath === track.fullPath && x.info.type === track.info.type
          );
          if (existingTrack) {
            existingTrack.pairingMask |= track.pairingMask;
            existingTrack.default ||= track.default;
            existingTrack.autoselect ||= track.autoselect;
            existingTrack.lineNumber = Math.min(existingTrack.lineNumber, track.lineNumber);
            if (track.peakBitrate !== null) {
              existingTrack.peakBitrate = Math.max(
                existingTrack.peakBitrate ?? -Infinity,
                track.peakBitrate
              );
            }
            if (track.averageBitrate !== null) {
              existingTrack.averageBitrate = Math.max(
                existingTrack.averageBitrate ?? -Infinity,
                track.averageBitrate
              );
            }
            if (existingTrack.languageCode === UNDETERMINED_LANGUAGE) {
              existingTrack.languageCode = track.languageCode;
            }
          } else {
            track.id = internalTracks.length + 1;
            internalTracks.push(track);
          }
        };
        for (const variantInternalTracks of internalTracksByVariant) {
          for (const trackEntry of variantInternalTracks) {
            addInternalTrack(trackEntry);
          }
        }
        internalTracks.sort((a, b) => a.lineNumber - b.lineNumber);
        this.trackBackings = [];
        for (const internalTrack of internalTracks) {
          if (internalTrack.info.type === "video") {
            this.trackBackings.push(
              new HlsInputVideoTrackBacking(internalTrack)
            );
          } else {
            this.trackBackings.push(
              new HlsInputAudioTrackBacking(internalTrack)
            );
          }
        }
        this.internalTracks = internalTracks;
      })();
    }
    async getTrackBackings() {
      await this.readMetadata();
      assert(this.trackBackings);
      return this.trackBackings;
    }
    getSegmentedInputForPath(path) {
      let segmentedInput = this.segmentedInputs.find((x) => x.path === path);
      if (segmentedInput) {
        return segmentedInput;
      }
      let decls = null;
      if (this.internalTracks) {
        const tracks = this.internalTracks.filter((x) => x.fullPath === path);
        decls = tracks.map((x) => ({
          id: x.id,
          type: x.info.type
        }));
      }
      segmentedInput = new HlsSegmentedInput(this, path, decls, null);
      this.segmentedInputs.push(segmentedInput);
      return segmentedInput;
    }
    async getMetadataTags() {
      return {};
    }
    async getMimeType() {
      return HLS_MIME_TYPE;
    }
    dispose() {
      if (this.segmentedInputs) {
        for (const segInput of this.segmentedInputs) {
          segInput.dispose();
        }
        this.segmentedInputs.length = 0;
      }
    }
  };
  var HlsInputTrackBacking = class {
    constructor(internalTrack) {
      this.internalTrack = internalTrack;
      this.hydrationPromise = null;
    }
    hydrate() {
      return this.hydrationPromise ??= (async () => {
        const segmentedInput = this.internalTrack.demuxer.getSegmentedInputForPath(this.internalTrack.fullPath);
        let trackBacking = null;
        const trackBackings = await segmentedInput.getTrackBackings();
        const matchingType = trackBackings.filter((x) => x.getType() === this.getType());
        if (matchingType.length === 1) {
          trackBacking = matchingType[0];
        } else {
          if (this instanceof HlsInputVideoTrackBacking) {
            for (const backing of matchingType) {
              if (await backing.getCodec() === this.getCodec()) {
                trackBacking = backing;
                break;
              }
            }
          } else {
            assert(this instanceof HlsInputAudioTrackBacking);
            for (const backing of matchingType) {
              if (await backing.getCodec() === this.getCodec()) {
                trackBacking = backing;
                break;
              }
            }
          }
        }
        if (!trackBacking) {
          throw new Error("Could not find matching track in underlying media data.");
        }
        this.internalTrack.backingTrack = trackBacking;
      })();
    }
    /** If the backing track is already present, delegate synchronously; otherwise, hydrate first. */
    delegate(fn) {
      if (this.internalTrack.backingTrack) {
        return fn();
      }
      return this.hydrate().then(fn);
    }
    getCodec() {
      throw new Error("Not implemented on base class.");
    }
    getDisposition() {
      return {
        ...DEFAULT_TRACK_DISPOSITION,
        // Meanings are swapped in HLS: "Default" means that a track is the primary track.
        default: this.internalTrack.autoselect,
        primary: this.internalTrack.default
      };
    }
    getId() {
      return this.internalTrack.id;
    }
    getPairingMask() {
      return this.internalTrack.pairingMask;
    }
    getInternalCodecId() {
      return null;
    }
    getLanguageCode() {
      return this.internalTrack.languageCode;
    }
    getName() {
      return this.internalTrack.name;
    }
    getNumber() {
      assert(this.internalTrack.demuxer.internalTracks);
      const trackType = this.internalTrack.info.type;
      let number = 0;
      for (const track of this.internalTrack.demuxer.internalTracks) {
        if (track.info.type === trackType) {
          number++;
        }
        if (track === this.internalTrack) {
          break;
        }
      }
      return number;
    }
    getTimeResolution() {
      return this.delegate(() => this.internalTrack.backingTrack.getTimeResolution());
    }
    isRelativeToUnixEpoch() {
      return this.delegate(() => this.internalTrack.backingTrack.isRelativeToUnixEpoch());
    }
    getUnixTimeForTimestamp(timestamp) {
      return this.delegate(() => this.internalTrack.backingTrack.getUnixTimeForTimestamp(timestamp));
    }
    getBitrate() {
      return this.internalTrack.peakBitrate;
    }
    getAverageBitrate() {
      return this.internalTrack.averageBitrate;
    }
    async getDurationFromMetadata(options) {
      await this.hydrate();
      return this.internalTrack.backingTrack.getDurationFromMetadata(options);
    }
    async getLiveRefreshInterval() {
      await this.hydrate();
      return this.internalTrack.backingTrack.getLiveRefreshInterval();
    }
    getHasOnlyKeyPackets() {
      return this.internalTrack.hasOnlyKeyPackets || null;
    }
    async getFirstPacket(options) {
      await this.hydrate();
      return this.internalTrack.backingTrack.getFirstPacket(options);
    }
    async getPacket(timestamp, options) {
      await this.hydrate();
      return this.internalTrack.backingTrack.getPacket(timestamp, options);
    }
    async getKeyPacket(timestamp, options) {
      await this.hydrate();
      return this.internalTrack.backingTrack.getKeyPacket(timestamp, options);
    }
    async getNextPacket(packet, options) {
      await this.hydrate();
      return this.internalTrack.backingTrack.getNextPacket(packet, options);
    }
    async getNextKeyPacket(packet, options) {
      await this.hydrate();
      return this.internalTrack.backingTrack.getNextKeyPacket(packet, options);
    }
  };
  var HlsInputVideoTrackBacking = class extends HlsInputTrackBacking {
    constructor(internalTrack) {
      super(internalTrack);
    }
    get backingVideoTrack() {
      return this.internalTrack.backingTrack;
    }
    getType() {
      return "video";
    }
    getCodec() {
      const inferredCodec = inferCodecFromCodecString(this.internalTrack.fullCodecString);
      return inferredCodec;
    }
    getCodedWidth() {
      return this.delegate(() => this.backingVideoTrack.getCodedWidth());
    }
    getCodedHeight() {
      return this.delegate(() => this.backingVideoTrack.getCodedHeight());
    }
    getSquarePixelWidth() {
      return this.delegate(() => this.backingVideoTrack.getSquarePixelWidth());
    }
    getSquarePixelHeight() {
      return this.delegate(() => this.backingVideoTrack.getSquarePixelHeight());
    }
    getMetadataDisplayWidth() {
      if (this.backingVideoTrack) {
        return null;
      }
      return this.internalTrack.info.width;
    }
    getMetadataDisplayHeight() {
      if (this.backingVideoTrack) {
        return null;
      }
      return this.internalTrack.info.height;
    }
    getRotation() {
      return this.delegate(() => this.backingVideoTrack.getRotation());
    }
    async getColorSpace() {
      await this.hydrate();
      return this.backingVideoTrack.getColorSpace();
    }
    async canBeTransparent() {
      await this.hydrate();
      return this.backingVideoTrack.canBeTransparent();
    }
    getMetadataCodecParameterString() {
      if (this.backingVideoTrack) {
        return null;
      }
      return this.internalTrack.fullCodecString;
    }
    async getDecoderConfig() {
      await this.hydrate();
      return this.backingVideoTrack.getDecoderConfig();
    }
  };
  var HlsInputAudioTrackBacking = class extends HlsInputTrackBacking {
    constructor(internalTrack) {
      super(internalTrack);
    }
    get backingAudioTrack() {
      return this.internalTrack.backingTrack;
    }
    getType() {
      return "audio";
    }
    getCodec() {
      const inferredCodec = inferCodecFromCodecString(this.internalTrack.fullCodecString);
      return inferredCodec;
    }
    getNumberOfChannels() {
      if (this.internalTrack.info.numberOfChannels !== null) {
        return this.internalTrack.info.numberOfChannels;
      }
      return this.delegate(() => this.backingAudioTrack.getNumberOfChannels());
    }
    getSampleRate() {
      return this.delegate(() => this.backingAudioTrack.getSampleRate());
    }
    getMetadataCodecParameterString() {
      if (this.backingAudioTrack) {
        return null;
      }
      return this.internalTrack.fullCodecString;
    }
    async getDecoderConfig() {
      await this.hydrate();
      return this.backingAudioTrack.getDecoderConfig();
    }
  };
  var getMediaTagDefault = (attributes) => {
    const value = attributes.get("default");
    if (value === null) {
      return false;
    }
    const normalized = value.toUpperCase();
    if (normalized === "YES") {
      return true;
    }
    if (normalized === "NO") {
      return false;
    }
    throw new Error(
      `Invalid M3U8 file; #EXT-X-MEDIA DEFAULT attribute must be YES or NO, got "${value}".`
    );
  };
  var getMediaTagAutoselect = (attributes) => {
    const value = attributes.get("autoselect");
    if (value === null) {
      return false;
    }
    const normalized = value.toUpperCase();
    if (normalized === "YES") {
      return true;
    }
    if (normalized === "NO") {
      return false;
    }
    throw new Error(
      `Invalid M3U8 file; #EXT-X-MEDIA AUTOSELECT attribute must be YES or NO, got "${value}".`
    );
  };
  var preprocessLanguageCode = (code) => {
    if (code === null) {
      return UNDETERMINED_LANGUAGE;
    }
    const languageSubtag = code.split("-")[0];
    if (!languageSubtag) {
      return UNDETERMINED_LANGUAGE;
    }
    return languageSubtag;
  };

  // src/input-format.ts
  var InputFormat = class {
    constructor() {
      /**
       * Provided for tree-shakable checking.
       * @internal
       */
      this._isIsobmff = false;
    }
  };
  var IsobmffInputFormat = class extends InputFormat {
    constructor() {
      super(...arguments);
      /** @internal */
      this._isIsobmff = true;
    }
    /** @internal */
    async _getMajorBrand(input) {
      let slice = input._reader.requestSlice(0, 12);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return null;
      slice.skip(4);
      const fourCc = readAscii(slice, 4);
      if (fourCc !== "ftyp" && fourCc !== "styp") {
        return null;
      }
      return readAscii(slice, 4);
    }
    /** @internal */
    _createDemuxer(input) {
      return new IsobmffDemuxer(input);
    }
  };
  var Mp4InputFormat = class extends IsobmffInputFormat {
    /** @internal */
    async _canReadInput(input) {
      const majorBrand = await this._getMajorBrand(input);
      if (majorBrand !== null) {
        return majorBrand !== "qt  ";
      }
      let slice = input._reader.requestSlice(4, 4);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      const fourCc = readAscii(slice, 4);
      return fourCc === "moof" || fourCc === "sidx";
    }
    get name() {
      return "MP4";
    }
    get mimeType() {
      return "video/mp4";
    }
  };
  var QuickTimeInputFormat = class extends IsobmffInputFormat {
    /** @internal */
    async _canReadInput(input) {
      const majorBrand = await this._getMajorBrand(input);
      return majorBrand === "qt  ";
    }
    get name() {
      return "QuickTime File Format";
    }
    get mimeType() {
      return "video/quicktime";
    }
  };
  var MatroskaInputFormat = class extends InputFormat {
    /** @internal */
    async isSupportedEBMLOfDocType(input, desiredDocType) {
      let headerSlice = input._reader.requestSlice(0, MAX_HEADER_SIZE);
      if (headerSlice instanceof Promise) headerSlice = await headerSlice;
      if (!headerSlice) return false;
      const varIntSize = readVarIntSize(headerSlice);
      if (varIntSize === null) {
        return false;
      }
      if (varIntSize < 1 || varIntSize > 8) {
        return false;
      }
      const id = readUnsignedInt(headerSlice, varIntSize);
      if (id !== 440786851 /* EBML */) {
        return false;
      }
      const dataSize = readElementSize(headerSlice);
      if (typeof dataSize !== "number") {
        return false;
      }
      let dataSlice = input._reader.requestSlice(headerSlice.filePos, dataSize);
      if (dataSlice instanceof Promise) dataSlice = await dataSlice;
      if (!dataSlice) return false;
      const startPos = headerSlice.filePos;
      while (dataSlice.filePos <= startPos + dataSize - MIN_HEADER_SIZE) {
        const header = readElementHeader(dataSlice);
        if (!header) break;
        const { id: id2, size } = header;
        const dataStartPos = dataSlice.filePos;
        if (size === void 0) return false;
        switch (id2) {
          case 17030 /* EBMLVersion */:
            {
              const ebmlVersion = readUnsignedInt(dataSlice, size);
              if (ebmlVersion !== 1) {
                return false;
              }
            }
            ;
            break;
          case 17143 /* EBMLReadVersion */:
            {
              const ebmlReadVersion = readUnsignedInt(dataSlice, size);
              if (ebmlReadVersion !== 1) {
                return false;
              }
            }
            ;
            break;
          case 17026 /* DocType */:
            {
              const docType = readAsciiString(dataSlice, size);
              if (docType !== desiredDocType) {
                return false;
              }
            }
            ;
            break;
          case 17031 /* DocTypeVersion */:
            {
              const docTypeVersion = readUnsignedInt(dataSlice, size);
              if (docTypeVersion > 4) {
                return false;
              }
            }
            ;
            break;
        }
        dataSlice.filePos = dataStartPos + size;
      }
      return true;
    }
    /** @internal */
    _canReadInput(input) {
      return this.isSupportedEBMLOfDocType(input, "matroska");
    }
    /** @internal */
    _createDemuxer(input) {
      return new MatroskaDemuxer(input);
    }
    get name() {
      return "Matroska";
    }
    get mimeType() {
      return "video/x-matroska";
    }
  };
  var WebMInputFormat = class extends MatroskaInputFormat {
    /** @internal */
    _canReadInput(input) {
      return this.isSupportedEBMLOfDocType(input, "webm");
    }
    get name() {
      return "WebM";
    }
    get mimeType() {
      return "video/webm";
    }
  };
  var Mp3InputFormat = class extends InputFormat {
    /** @internal */
    async _canReadInput(input) {
      let currentPos = 0;
      while (true) {
        let slice2 = input._reader.requestSlice(currentPos, ID3_V2_HEADER_SIZE);
        if (slice2 instanceof Promise) slice2 = await slice2;
        if (!slice2) break;
        const id3V2Header = readId3V2Header(slice2);
        if (!id3V2Header) {
          break;
        }
        currentPos = slice2.filePos + id3V2Header.size;
      }
      const firstResult = await readNextMp3FrameHeader(input._reader, currentPos, currentPos + 4096);
      if (!firstResult) {
        return false;
      }
      const firstHeader = firstResult.header;
      const xingOffset = getXingOffset(firstHeader.mpegVersionId, firstHeader.channel);
      let slice = input._reader.requestSlice(firstResult.startPos + xingOffset, 4);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      const word = readU32Be(slice);
      const isXing = word === XING || word === INFO;
      if (isXing) {
        return true;
      }
      currentPos = firstResult.startPos + firstResult.header.totalSize;
      const secondResult = await readNextMp3FrameHeader(
        input._reader,
        currentPos,
        currentPos + MP3_FRAME_HEADER_SIZE
      );
      if (!secondResult) {
        return false;
      }
      const secondHeader = secondResult.header;
      if (firstHeader.channel !== secondHeader.channel || firstHeader.sampleRate !== secondHeader.sampleRate) {
        return false;
      }
      return true;
    }
    /** @internal */
    _createDemuxer(input) {
      return new Mp3Demuxer(input);
    }
    get name() {
      return "MP3";
    }
    get mimeType() {
      return "audio/mpeg";
    }
  };
  var WaveInputFormat = class extends InputFormat {
    /** @internal */
    async _canReadInput(input) {
      let slice = input._reader.requestSlice(0, 12);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      const riffType = readAscii(slice, 4);
      if (riffType !== "RIFF" && riffType !== "RIFX" && riffType !== "RF64") {
        return false;
      }
      slice.skip(4);
      const format = readAscii(slice, 4);
      return format === "WAVE";
    }
    /** @internal */
    _createDemuxer(input) {
      return new WaveDemuxer(input);
    }
    get name() {
      return "WAVE";
    }
    get mimeType() {
      return "audio/wav";
    }
  };
  var OggInputFormat = class extends InputFormat {
    /** @internal */
    async _canReadInput(input) {
      let slice = input._reader.requestSlice(0, 4);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      return readAscii(slice, 4) === "OggS";
    }
    /** @internal */
    _createDemuxer(input) {
      return new OggDemuxer(input);
    }
    get name() {
      return "Ogg";
    }
    get mimeType() {
      return "application/ogg";
    }
  };
  var FlacInputFormat = class extends InputFormat {
    /** @internal */
    async _canReadInput(input) {
      let currentPos = 0;
      while (true) {
        let slice2 = input._reader.requestSlice(currentPos, ID3_V2_HEADER_SIZE);
        if (slice2 instanceof Promise) slice2 = await slice2;
        if (!slice2) break;
        const id3V2Header = readId3V2Header(slice2);
        if (!id3V2Header) {
          break;
        }
        currentPos = slice2.filePos + id3V2Header.size;
      }
      let slice = input._reader.requestSlice(currentPos, 4);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      return readAscii(slice, 4) === "fLaC";
    }
    get name() {
      return "FLAC";
    }
    get mimeType() {
      return "audio/flac";
    }
    /** @internal */
    _createDemuxer(input) {
      return new FlacDemuxer(input);
    }
  };
  var AdtsInputFormat = class extends InputFormat {
    /** @internal */
    async _canReadInput(input) {
      let currentPos = 0;
      while (true) {
        let slice2 = input._reader.requestSlice(currentPos, ID3_V2_HEADER_SIZE);
        if (slice2 instanceof Promise) slice2 = await slice2;
        if (!slice2) break;
        const id3V2Header = readId3V2Header(slice2);
        if (!id3V2Header) {
          break;
        }
        currentPos = slice2.filePos + id3V2Header.size;
      }
      let slice = input._reader.requestSliceRange(
        currentPos,
        MIN_ADTS_FRAME_HEADER_SIZE,
        MAX_ADTS_FRAME_HEADER_SIZE
      );
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      const firstHeader = readAdtsFrameHeader(slice);
      if (!firstHeader) {
        return false;
      }
      currentPos += firstHeader.frameLength;
      slice = input._reader.requestSliceRange(
        currentPos,
        MIN_ADTS_FRAME_HEADER_SIZE,
        MAX_ADTS_FRAME_HEADER_SIZE
      );
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      const secondHeader = readAdtsFrameHeader(slice);
      if (!secondHeader) {
        return false;
      }
      return firstHeader.objectType === secondHeader.objectType && firstHeader.samplingFrequencyIndex === secondHeader.samplingFrequencyIndex && firstHeader.channelConfiguration === secondHeader.channelConfiguration;
    }
    /** @internal */
    _createDemuxer(input) {
      return new AdtsDemuxer(input);
    }
    get name() {
      return "ADTS";
    }
    get mimeType() {
      return "audio/aac";
    }
  };
  var MpegTsInputFormat = class extends InputFormat {
    /** @internal */
    async _canReadInput(input) {
      const lengthToCheck = TS_PACKET_SIZE + 16 + 1;
      let slice = input._reader.requestSlice(0, lengthToCheck);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      const bytes2 = readBytes(slice, lengthToCheck);
      if (bytes2[0] === 71 && bytes2[TS_PACKET_SIZE] === 71) {
        return true;
      } else if (bytes2[0] === 71 && bytes2[TS_PACKET_SIZE + 16] === 71) {
        return true;
      } else if (bytes2[4] === 71 && bytes2[4 + TS_PACKET_SIZE + 4] === 71) {
        return true;
      }
      return false;
    }
    /** @internal */
    _createDemuxer(input) {
      return new MpegTsDemuxer(input);
    }
    get name() {
      return "MPEG Transport Stream";
    }
    get mimeType() {
      return "video/MP2T";
    }
  };
  var HlsInputFormat = class extends InputFormat {
    /** @internal */
    async _canReadInput(input) {
      let slice = input._reader.requestSlice(0, 7);
      if (slice instanceof Promise) slice = await slice;
      if (!slice) return false;
      const isM3u8 = readAscii(slice, 7) === "#EXTM3U";
      if (!isM3u8) {
        return false;
      }
      if (!(input._rootSource instanceof PathedSource)) {
        throw new TypeError("HLS inputs require `InputOptions.source` to be a PathedSource or a ref to one.");
      }
      input._rootSource._usedForHls = true;
      return true;
    }
    /** @internal */
    _createDemuxer(input) {
      return new HlsDemuxer(input);
    }
    get name() {
      return "HTTP Live Streaming (HLS)";
    }
    get mimeType() {
      return HLS_MIME_TYPE;
    }
  };
  var MP4 = /* @__PURE__ */ new Mp4InputFormat();
  var QTFF = /* @__PURE__ */ new QuickTimeInputFormat();
  var MATROSKA = /* @__PURE__ */ new MatroskaInputFormat();
  var WEBM = /* @__PURE__ */ new WebMInputFormat();
  var MP3 = /* @__PURE__ */ new Mp3InputFormat();
  var WAVE = /* @__PURE__ */ new WaveInputFormat();
  var OGG = /* @__PURE__ */ new OggInputFormat();
  var ADTS = /* @__PURE__ */ new AdtsInputFormat();
  var FLAC = /* @__PURE__ */ new FlacInputFormat();
  var MPEG_TS = /* @__PURE__ */ new MpegTsInputFormat();
  var HLS = /* @__PURE__ */ new HlsInputFormat();
  var ALL_FORMATS = [HLS, MP4, QTFF, MATROSKA, WEBM, WAVE, OGG, FLAC, MP3, ADTS, MPEG_TS];
  var HLS_FORMATS = [HLS, MP4, QTFF, MP3, ADTS, MPEG_TS];
  var validateInputFormatOptions = (options, prefix) => {
    if (!options || typeof options !== "object") {
      throw new TypeError(`${prefix}, when provided, must be an object.`);
    }
    if (options.isobmff !== void 0) {
      if (!options.isobmff || typeof options.isobmff !== "object") {
        throw new TypeError(`${prefix}.isobmff, when provided, must be an object.`);
      }
      if (options.isobmff.resolveKeyId !== void 0 && typeof options.isobmff.resolveKeyId !== "function") {
        throw new TypeError(`${prefix}.isobmff.resolveKeyId, when provided, must be a function.`);
      }
    }
    if (options.hls !== void 0) {
      if (!options.hls || typeof options.hls !== "object") {
        throw new TypeError(`${prefix}.hls, when provided, must be an object.`);
      }
      if (options.hls.offsetTimestampsByDateTime !== void 0 && typeof options.hls.offsetTimestampsByDateTime !== "boolean") {
        throw new TypeError(`${prefix}.hls.offsetTimestampsByDateTime, when provided, must be a boolean.`);
      }
    }
  };

  // src/decode.ts
  var canDecodeVideoMemo = /* @__PURE__ */ new Map();
  var canDecodeAudioMemo = /* @__PURE__ */ new Map();
  var validateVideoDecodingConfig = (codec, options) => {
    if (!options || typeof options !== "object") {
      throw new TypeError("options must be an object.");
    }
    if (options.codec !== void 0 && typeof options.codec !== "string") {
      throw new TypeError("options.codec, when provided, must be a string.");
    }
    if (options.codec !== void 0 && inferCodecFromCodecString(options.codec) !== codec) {
      throw new TypeError(`options.codec, when provided, must match the specified codec (${codec}).`);
    }
    if (options.codedWidth !== void 0 && (!Number.isInteger(options.codedWidth) || options.codedWidth <= 0)) {
      throw new TypeError("options.codedWidth, when provided, must be a positive integer.");
    }
    if (options.codedHeight !== void 0 && (!Number.isInteger(options.codedHeight) || options.codedHeight <= 0)) {
      throw new TypeError("options.codedHeight, when provided, must be a positive integer.");
    }
    if (options.displayAspectWidth !== void 0 && (!Number.isInteger(options.displayAspectWidth) || options.displayAspectWidth <= 0)) {
      throw new TypeError("options.displayAspectWidth, when provided, must be a positive integer.");
    }
    if (options.displayAspectHeight !== void 0 && (!Number.isInteger(options.displayAspectHeight) || options.displayAspectHeight <= 0)) {
      throw new TypeError("options.displayAspectHeight, when provided, must be a positive integer.");
    }
    if (options.description !== void 0 && !isAllowSharedBufferSource(options.description)) {
      throw new TypeError("options.description, when provided, must be a buffer source.");
    }
    if (options.hardwareAcceleration !== void 0 && !["no-preference", "prefer-hardware", "prefer-software"].includes(options.hardwareAcceleration)) {
      throw new TypeError(
        "options.hardwareAcceleration, when provided, must be 'no-preference', 'prefer-hardware' or 'prefer-software'."
      );
    }
    if (options.optimizeForLatency !== void 0 && typeof options.optimizeForLatency !== "boolean") {
      throw new TypeError("options.optimizeForLatency, when provided, must be a boolean.");
    }
  };
  var validateAudioDecodingConfig = (codec, options) => {
    if (!options || typeof options !== "object") {
      throw new TypeError("options must be an object.");
    }
    if (options.codec !== void 0 && typeof options.codec !== "string") {
      throw new TypeError("options.codec, when provided, must be a string.");
    }
    if (options.codec !== void 0 && inferCodecFromCodecString(options.codec) !== codec) {
      throw new TypeError(`options.codec, when provided, must match the specified codec (${codec}).`);
    }
    if (options.numberOfChannels !== void 0 && (!Number.isInteger(options.numberOfChannels) || options.numberOfChannels <= 0)) {
      throw new TypeError("options.numberOfChannels, when provided, must be a positive integer.");
    }
    if (options.sampleRate !== void 0 && (!Number.isInteger(options.sampleRate) || options.sampleRate <= 0)) {
      throw new TypeError("options.sampleRate, when provided, must be a positive integer.");
    }
    if (options.description !== void 0 && !isAllowSharedBufferSource(options.description)) {
      throw new TypeError("options.description, when provided, must be a buffer source.");
    }
  };
  var canDecode = (codec) => {
    if (VIDEO_CODECS.includes(codec)) {
      return canDecodeVideo(codec);
    } else if (AUDIO_CODECS.includes(codec)) {
      return canDecodeAudio(codec);
    }
    return false;
  };
  var canDecodeVideo = async (codec, options = {}) => {
    if (!VIDEO_CODECS.includes(codec)) {
      return false;
    }
    validateVideoDecodingConfig(codec, options);
    const resolvedOptions = {
      ...options,
      codedWidth: options.codedWidth ?? 1280,
      codedHeight: options.codedHeight ?? 720,
      codec: options.codec ?? buildVideoCodecString(codec, 1280, 720, 1e6, false)
    };
    resolvedOptions.description ??= guessDescriptionForVideo(resolvedOptions);
    const key = JSON.stringify(resolvedOptions);
    const memoized = canDecodeVideoMemo.get(key);
    if (memoized) {
      return memoized;
    }
    const promise = (async () => {
      if (customVideoDecoders.some((x) => x.supports(codec, resolvedOptions))) {
        return true;
      }
      if (typeof VideoDecoder === "undefined") {
        return false;
      }
      const support = await VideoDecoder.isConfigSupported(resolvedOptions);
      return support.supported === true;
    })();
    canDecodeVideoMemo.set(key, promise);
    return promise;
  };
  var canDecodeAudio = async (codec, options = {}) => {
    if (!AUDIO_CODECS.includes(codec)) {
      return false;
    }
    validateAudioDecodingConfig(codec, options);
    const resolvedOptions = {
      ...options,
      numberOfChannels: options.numberOfChannels ?? 2,
      sampleRate: options.sampleRate ?? 48e3,
      codec: options.codec ?? buildAudioCodecString(codec, 2, 48e3)
    };
    if (resolvedOptions.description === void 0) {
      const generatedDescription = guessDescriptionForAudio(resolvedOptions);
      if (generatedDescription === false) {
        return false;
      }
      resolvedOptions.description = generatedDescription;
    }
    const key = JSON.stringify(resolvedOptions);
    const memoized = canDecodeAudioMemo.get(key);
    if (memoized) {
      return memoized;
    }
    const promise = (async () => {
      if (customAudioDecoders.some((x) => x.supports(codec, resolvedOptions))) {
        return true;
      }
      if (PCM_AUDIO_CODECS.includes(codec)) {
        return true;
      }
      if (typeof AudioDecoder === "undefined") {
        return false;
      }
      const support = await AudioDecoder.isConfigSupported(resolvedOptions);
      return support.supported === true;
    })();
    canDecodeAudioMemo.set(key, promise);
    return promise;
  };
  var getDecodableCodecs = async () => {
    const [videoCodecs, audioCodecs] = await Promise.all([
      getDecodableVideoCodecs(),
      getDecodableAudioCodecs()
    ]);
    return [...videoCodecs, ...audioCodecs];
  };
  var getDecodableVideoCodecs = async (checkedCodecs = VIDEO_CODECS, options) => {
    const bools = await Promise.all(checkedCodecs.map((codec) => canDecodeVideo(codec, options)));
    return checkedCodecs.filter((_, i) => bools[i]);
  };
  var getDecodableAudioCodecs = async (checkedCodecs = AUDIO_CODECS, options) => {
    const bools = await Promise.all(checkedCodecs.map((codec) => canDecodeAudio(codec, options)));
    return checkedCodecs.filter((_, i) => bools[i]);
  };

  // src/sample.ts
  polyfillSymbolDispose();
  var lastVideoGcErrorLog = -Infinity;
  var lastAudioGcErrorLog = -Infinity;
  var finalizationRegistry = null;
  if (typeof FinalizationRegistry !== "undefined") {
    finalizationRegistry = new FinalizationRegistry((value) => {
      const now = performance.now();
      if (value.type === "video") {
        if (now - lastVideoGcErrorLog >= 1e3) {
          Logging._error(
            `A VideoSample was garbage collected without first being closed. For proper resource management, make sure to call close() on all your VideoSamples as soon as you're done using them.`
          );
          lastVideoGcErrorLog = now;
        }
        if (typeof VideoFrame !== "undefined" && value.data instanceof VideoFrame) {
          value.data.close();
        }
      } else {
        if (now - lastAudioGcErrorLog >= 1e3) {
          Logging._error(
            `An AudioSample was garbage collected without first being closed. For proper resource management, make sure to call close() on all your AudioSamples as soon as you're done using them.`
          );
          lastAudioGcErrorLog = now;
        }
        if (typeof AudioData !== "undefined" && value.data instanceof AudioData) {
          value.data.close();
        }
      }
    });
  }
  var VideoSampleResource = class {
    constructor() {
      /** @internal */
      this._referenceCount = 0;
      /** @internal */
      this._lastAllocationBuffer = null;
    }
  };
  var VIDEO_SAMPLE_PIXEL_FORMATS = [
    // 4:2:0 Y, U, V
    "I420",
    "I420P10",
    "I420P12",
    // 4:2:0 Y, U, V, A
    "I420A",
    "I420AP10",
    "I420AP12",
    // 4:2:2 Y, U, V
    "I422",
    "I422P10",
    "I422P12",
    // 4:2:2 Y, U, V, A
    "I422A",
    "I422AP10",
    "I422AP12",
    // 4:4:4 Y, U, V
    "I444",
    "I444P10",
    "I444P12",
    // 4:4:4 Y, U, V, A
    "I444A",
    "I444AP10",
    "I444AP12",
    // 4:2:0 Y, UV
    "NV12",
    // 4:4:4 RGBA
    "RGBA",
    // 4:4:4 RGBX (opaque)
    "RGBX",
    // 4:4:4 BGRA
    "BGRA",
    // 4:4:4 BGRX (opaque)
    "BGRX"
  ];
  var VIDEO_SAMPLE_PIXEL_FORMATS_SET = new Set(VIDEO_SAMPLE_PIXEL_FORMATS);
  var VideoSample = class _VideoSample {
    constructor(data, init) {
      /** @internal */
      this._closed = false;
      if (data instanceof ArrayBuffer || typeof SharedArrayBuffer !== "undefined" && data instanceof SharedArrayBuffer || ArrayBuffer.isView(data)) {
        if (!init || typeof init !== "object") {
          throw new TypeError("init must be an object.");
        }
        if (init.format === void 0 || !VIDEO_SAMPLE_PIXEL_FORMATS_SET.has(init.format)) {
          throw new TypeError("init.format must be one of: " + VIDEO_SAMPLE_PIXEL_FORMATS.join(", "));
        }
        if (!Number.isInteger(init.codedWidth) || init.codedWidth <= 0) {
          throw new TypeError("init.codedWidth must be a positive integer.");
        }
        if (!Number.isInteger(init.codedHeight) || init.codedHeight <= 0) {
          throw new TypeError("init.codedHeight must be a positive integer.");
        }
        if (init.rotation !== void 0 && ![0, 90, 180, 270].includes(init.rotation)) {
          throw new TypeError("init.rotation, when provided, must be 0, 90, 180, or 270.");
        }
        if (!Number.isFinite(init.timestamp)) {
          throw new TypeError("init.timestamp must be a number.");
        }
        if (init.duration !== void 0 && (!Number.isFinite(init.duration) || init.duration < 0)) {
          throw new TypeError("init.duration, when provided, must be a non-negative number.");
        }
        if (init.layout !== void 0) {
          if (!Array.isArray(init.layout)) {
            throw new TypeError("init.layout, when provided, must be an array.");
          }
          for (const plane of init.layout) {
            if (!plane || typeof plane !== "object" || Array.isArray(plane)) {
              throw new TypeError("Each entry in init.layout must be an object.");
            }
            if (!Number.isInteger(plane.offset) || plane.offset < 0) {
              throw new TypeError("plane.offset must be a non-negative integer.");
            }
            if (!Number.isInteger(plane.stride) || plane.stride < 0) {
              throw new TypeError("plane.stride must be a non-negative integer.");
            }
          }
        }
        if (init.visibleRect !== void 0) {
          validateRectangle(init.visibleRect, "init.visibleRect");
        }
        if (init.displayWidth !== void 0 && (!Number.isInteger(init.displayWidth) || init.displayWidth <= 0)) {
          throw new TypeError("init.displayWidth, when provided, must be a positive integer.");
        }
        if (init.displayHeight !== void 0 && (!Number.isInteger(init.displayHeight) || init.displayHeight <= 0)) {
          throw new TypeError("init.displayHeight, when provided, must be a positive integer.");
        }
        if (init.displayWidth !== void 0 !== (init.displayHeight !== void 0)) {
          throw new TypeError(
            "init.displayWidth and init.displayHeight must be either both provided or both omitted."
          );
        }
        this.format = init.format;
        this.rotation = init.rotation ?? 0;
        this.timestamp = init.timestamp;
        this.duration = init.duration ?? 0;
        const layout = init.layout ?? createDefaultPlaneLayout(init.format, init.codedWidth, init.codedHeight);
        let colorSpaceInit = init.colorSpace ?? null;
        if (colorSpaceInit === null) {
          if (this.format === "RGBA" || this.format === "RGBX" || this.format === "BGRA" || this.format === "BGRX") {
            colorSpaceInit = {
              primaries: "bt709",
              transfer: "iec61966-2-1",
              matrix: "rgb",
              fullRange: true
            };
          } else {
            colorSpaceInit = {
              primaries: "bt709",
              transfer: "bt709",
              matrix: "bt709",
              fullRange: false
            };
          }
        }
        this.visibleRect = {
          left: init.visibleRect?.left ?? 0,
          top: init.visibleRect?.top ?? 0,
          width: init.visibleRect?.width ?? init.codedWidth,
          height: init.visibleRect?.height ?? init.codedHeight
        };
        if (init.displayWidth !== void 0) {
          this.squarePixelWidth = this.rotation % 180 === 0 ? init.displayWidth : init.displayHeight;
          this.squarePixelHeight = this.rotation % 180 === 0 ? init.displayHeight : init.displayWidth;
        } else {
          this.squarePixelWidth = this.visibleRect.width;
          this.squarePixelHeight = this.visibleRect.height;
        }
        this._data = init._doNotCopy ? toUint8Array(data) : toUint8Array(data).slice();
        this._layout = layout;
        this.colorSpace = new VideoSampleColorSpace(colorSpaceInit);
      } else if (typeof VideoFrame !== "undefined" && data instanceof VideoFrame) {
        if (init?.rotation !== void 0 && ![0, 90, 180, 270].includes(init.rotation)) {
          throw new TypeError("init.rotation, when provided, must be 0, 90, 180, or 270.");
        }
        if (init?.timestamp !== void 0 && !Number.isFinite(init?.timestamp)) {
          throw new TypeError("init.timestamp, when provided, must be a number.");
        }
        if (init?.duration !== void 0 && (!Number.isFinite(init.duration) || init.duration < 0)) {
          throw new TypeError("init.duration, when provided, must be a non-negative number.");
        }
        if (init?.visibleRect !== void 0) {
          validateRectangle(init.visibleRect, "init.visibleRect");
        }
        this._data = data;
        this._layout = null;
        this.format = data.format;
        this.visibleRect = {
          left: data.visibleRect?.x ?? 0,
          top: data.visibleRect?.y ?? 0,
          width: data.visibleRect?.width ?? data.codedWidth,
          height: data.visibleRect?.height ?? data.codedHeight
        };
        this.rotation = init?.rotation ?? 0;
        this.squarePixelWidth = data.displayWidth;
        this.squarePixelHeight = data.displayHeight;
        this.timestamp = init?.timestamp ?? data.timestamp / 1e6;
        this.duration = init?.duration ?? (data.duration ?? 0) / 1e6;
        this.colorSpace = new VideoSampleColorSpace(data.colorSpace);
      } else if (typeof HTMLImageElement !== "undefined" && data instanceof HTMLImageElement || typeof SVGImageElement !== "undefined" && data instanceof SVGImageElement || typeof ImageBitmap !== "undefined" && data instanceof ImageBitmap || typeof HTMLVideoElement !== "undefined" && data instanceof HTMLVideoElement || typeof HTMLCanvasElement !== "undefined" && data instanceof HTMLCanvasElement || typeof OffscreenCanvas !== "undefined" && data instanceof OffscreenCanvas) {
        if (!init || typeof init !== "object") {
          throw new TypeError("init must be an object.");
        }
        if (init.rotation !== void 0 && ![0, 90, 180, 270].includes(init.rotation)) {
          throw new TypeError("init.rotation, when provided, must be 0, 90, 180, or 270.");
        }
        if (!Number.isFinite(init.timestamp)) {
          throw new TypeError("init.timestamp must be a number.");
        }
        if (init.duration !== void 0 && (!Number.isFinite(init.duration) || init.duration < 0)) {
          throw new TypeError("init.duration, when provided, must be a non-negative number.");
        }
        if (init.visibleRect !== void 0) {
          validateRectangle(init.visibleRect, "init.visibleRect");
        }
        if (typeof VideoFrame !== "undefined") {
          return new _VideoSample(
            new VideoFrame(data, {
              timestamp: Math.trunc(init.timestamp * SECOND_TO_MICROSECOND_FACTOR),
              // Drag 0 to undefined
              duration: Math.trunc((init.duration ?? 0) * SECOND_TO_MICROSECOND_FACTOR) || void 0,
              // WebCodecs wants DOMRectInit
              visibleRect: init.visibleRect && {
                x: init.visibleRect.left,
                y: init.visibleRect.top,
                width: init.visibleRect.width,
                height: init.visibleRect.height
              }
            }),
            init
          );
        }
        let width = 0;
        let height = 0;
        if ("naturalWidth" in data) {
          width = data.naturalWidth;
          height = data.naturalHeight;
        } else if ("videoWidth" in data) {
          width = data.videoWidth;
          height = data.videoHeight;
        } else if ("width" in data) {
          width = Number(data.width);
          height = Number(data.height);
        }
        if (!width || !height) {
          throw new TypeError("Could not determine dimensions.");
        }
        const visibleRect = init.visibleRect ?? { left: 0, top: 0, width, height };
        const canvas = new OffscreenCanvas(visibleRect.width, visibleRect.height);
        const context = canvas.getContext("2d", {
          alpha: isFirefox(),
          // Firefox has VideoFrame glitches with opaque canvases
          willReadFrequently: true
        });
        if (!context) {
          throw new Error(
            "OffscreenCanvas must have support for the '2d' context in order to create a VideoSample from this data."
          );
        }
        context.drawImage(data, -visibleRect.left, -visibleRect.top);
        this._data = canvas;
        this._layout = null;
        this.format = "RGBX";
        this.visibleRect = { left: 0, top: 0, width: visibleRect.width, height: visibleRect.height };
        this.squarePixelWidth = visibleRect.width;
        this.squarePixelHeight = visibleRect.height;
        this.rotation = init.rotation ?? 0;
        this.timestamp = init.timestamp;
        this.duration = init.duration ?? 0;
        this.colorSpace = new VideoSampleColorSpace({
          matrix: "rgb",
          primaries: "bt709",
          transfer: "iec61966-2-1",
          fullRange: true
        });
      } else if (data instanceof VideoSampleResource) {
        if (!init || typeof init !== "object") {
          throw new TypeError("init must be an object.");
        }
        if (init.rotation !== void 0 && ![0, 90, 180, 270].includes(init.rotation)) {
          throw new TypeError("init.rotation, when provided, must be 0, 90, 180, or 270.");
        }
        if (!Number.isFinite(init.timestamp)) {
          throw new TypeError("init.timestamp must be a number.");
        }
        if (init.duration !== void 0 && (!Number.isFinite(init.duration) || init.duration < 0)) {
          throw new TypeError("init.duration, when provided, must be a non-negative number.");
        }
        this._data = data;
        data._referenceCount++;
        this.format = data.getFormat();
        if (this.format !== null && !VIDEO_SAMPLE_PIXEL_FORMATS.includes(this.format)) {
          throw new TypeError("getFormat() must return a VideoSamplePixelFormat or null.");
        }
        this.visibleRect = {
          left: 0,
          top: 0,
          width: data.getCodedWidth(),
          height: data.getCodedHeight()
        };
        if (!Number.isInteger(this.visibleRect.width) || this.visibleRect.width <= 0) {
          throw new TypeError("getCodedWidth() must return a positive integer.");
        }
        if (!Number.isInteger(this.visibleRect.height) || this.visibleRect.height <= 0) {
          throw new TypeError("getCodedHeight() must return a positive integer.");
        }
        this.squarePixelWidth = data.getSquarePixelWidth();
        if (!Number.isInteger(this.squarePixelWidth) || this.squarePixelWidth <= 0) {
          throw new TypeError("getSquarePixelWidth() must return a positive integer.");
        }
        this.squarePixelHeight = data.getSquarePixelHeight();
        if (!Number.isInteger(this.squarePixelHeight) || this.squarePixelHeight <= 0) {
          throw new TypeError("getSquarePixelHeight() must return a positive integer.");
        }
        this.rotation = init.rotation ?? 0;
        this.timestamp = init.timestamp;
        this.duration = init.duration ?? 0;
        this.colorSpace = data.getColorSpace();
      } else {
        throw new TypeError(
          "Invalid data type: Must be a BufferSource, CanvasImageSource, or VideoSampleResource."
        );
      }
      this.encodeOptions = init?.encodeOptions ?? {};
      this.pixelAspectRatio = simplifyRational({
        num: this.squarePixelWidth * this.codedHeight,
        den: this.squarePixelHeight * this.codedWidth
      });
      finalizationRegistry?.register(this, { type: "video", data: this._data }, this);
    }
    /** The width of the frame in pixels. */
    get codedWidth() {
      return this.visibleRect.width;
    }
    /** The height of the frame in pixels. */
    get codedHeight() {
      return this.visibleRect.height;
    }
    /** The display width of the frame in pixels, after aspect ratio adjustment and rotation. */
    get displayWidth() {
      return this.rotation % 180 === 0 ? this.squarePixelWidth : this.squarePixelHeight;
    }
    /** The display height of the frame in pixels, after aspect ratio adjustment and rotation. */
    get displayHeight() {
      return this.rotation % 180 === 0 ? this.squarePixelHeight : this.squarePixelWidth;
    }
    /** The presentation timestamp of the frame in microseconds. */
    get microsecondTimestamp() {
      return Math.trunc(SECOND_TO_MICROSECOND_FACTOR * this.timestamp);
    }
    /** The duration of the frame in microseconds. */
    get microsecondDuration() {
      return Math.trunc(SECOND_TO_MICROSECOND_FACTOR * this.duration);
    }
    /**
     * Whether this sample uses a pixel format that can hold transparency data. Note that this doesn't necessarily mean
     * that the sample is transparent.
     */
    get hasAlpha() {
      return this.format && this.format.includes("A");
    }
    /** Clones this video sample. */
    clone() {
      if (this._closed) {
        throw new Error("VideoSample is closed.");
      }
      assert(this._data !== null);
      if (this._data instanceof VideoSampleResource) {
        return new _VideoSample(this._data, {
          timestamp: this.timestamp,
          duration: this.duration,
          rotation: this.rotation,
          encodeOptions: this.encodeOptions
        });
      } else if (isVideoFrame(this._data)) {
        return new _VideoSample(this._data.clone(), {
          timestamp: this.timestamp,
          duration: this.duration,
          rotation: this.rotation,
          encodeOptions: this.encodeOptions
        });
      } else if (this._data instanceof Uint8Array) {
        assert(this._layout);
        return new _VideoSample(this._data, {
          format: this.format,
          layout: this._layout,
          codedWidth: this.codedWidth,
          codedHeight: this.codedHeight,
          timestamp: this.timestamp,
          duration: this.duration,
          colorSpace: this.colorSpace,
          rotation: this.rotation,
          visibleRect: this.visibleRect,
          displayWidth: this.displayWidth,
          displayHeight: this.displayHeight,
          encodeOptions: this.encodeOptions,
          // It's already been copied, if we copy it again we make the clone unnecessarily expensive
          _doNotCopy: true
        });
      } else {
        return new _VideoSample(this._data, {
          format: this.format,
          codedWidth: this.codedWidth,
          codedHeight: this.codedHeight,
          timestamp: this.timestamp,
          duration: this.duration,
          colorSpace: this.colorSpace,
          rotation: this.rotation,
          visibleRect: this.visibleRect,
          displayWidth: this.displayWidth,
          displayHeight: this.displayHeight,
          encodeOptions: this.encodeOptions
        });
      }
    }
    /**
     * Closes this video sample, releasing held resources. Video samples should be closed as soon as they are not
     * needed anymore.
     */
    close() {
      if (this._closed) {
        return;
      }
      finalizationRegistry?.unregister(this);
      if (this._data instanceof VideoSampleResource) {
        this._data._referenceCount--;
        if (this._data._referenceCount === 0) {
          this._data.close();
        }
      } else if (isVideoFrame(this._data)) {
        this._data.close();
      } else {
        this._data = null;
      }
      this._closed = true;
    }
    /**
     * Returns the number of bytes required to hold this video sample's pixel data.
     */
    allocationSize(options = {}) {
      validateVideoFrameCopyToOptions(options);
      if (this._closed) {
        throw new Error("VideoSample is closed.");
      }
      if ((options.format ?? this.format) == null) {
        throw new Error("Cannot get allocation size when format is null.");
      }
      if (isVideoFrame(this._data)) {
        return this._data.allocationSize(options);
      }
      const combinedLayout = ParseVideoFrameCopyToOptions(this, options);
      return combinedLayout.allocationSize;
    }
    /**
     * Copies this video sample's pixel data to an ArrayBuffer or ArrayBufferView.
     * @returns The byte layout of the planes of the copied data.
     */
    async copyTo(destination, options = {}) {
      if (!isAllowSharedBufferSource(destination)) {
        throw new TypeError("destination must be an ArrayBuffer or an ArrayBuffer view.");
      }
      validateVideoFrameCopyToOptions(options);
      if (this._closed) {
        throw new Error("VideoSample is closed.");
      }
      if ((options.format ?? this.format) == null) {
        throw new Error("Cannot copy video sample data when format is null.");
      }
      assert(this._data !== null);
      if (isVideoFrame(this._data)) {
        return this._data.copyTo(destination, options);
      }
      if (options.format && !["RGBA", "RGBX", "BGRA", "BGRX"].includes(this.format) && ["RGBA", "RGBX", "BGRA", "BGRX"].includes(options.format)) {
        if (this._data instanceof VideoSampleResource) {
          var _stack = [];
          try {
            const rgbSample = __using(_stack, await this._data.toRgbSample(
              {
                timestamp: this.timestamp,
                duration: this.duration,
                rotation: this.rotation
              },
              options.colorSpace ?? "srgb"
            ));
            if (!(rgbSample instanceof _VideoSample)) {
              throw new TypeError("toRgbSample() must return a VideoSample.");
            }
            if (!["RGBA", "RGBX", "BGRA", "BGRX"].includes(rgbSample.format)) {
              throw new Error(
                `Sample returned by toRgbSample was expected to have an RGB format, got '${rgbSample.format}' instead.`
              );
            }
            return await rgbSample.copyTo(destination, options);
          } catch (_) {
            var _error = _, _hasError = true;
          } finally {
            __callDispose(_stack, _error, _hasError);
          }
        } else {
          if (typeof VideoFrame === "undefined") {
            throw new Error(
              "For this sample, converting from a non-RGB to an RGB format requires VideoFrame to be defined."
            );
          }
          const tempFrame = this.toVideoFrame();
          const result = await tempFrame.copyTo(destination, options);
          tempFrame.close();
          return result;
        }
      }
      const combinedLayout = ParseVideoFrameCopyToOptions(this, options);
      assert(this.format);
      const destBytes = toUint8Array(destination);
      if (destBytes.byteLength < combinedLayout.allocationSize) {
        throw new TypeError(
          `Destination buffer too small. Required: ${combinedLayout.allocationSize}, Available: ${destBytes.byteLength}`
        );
      }
      const planeConfigs = getPlaneConfigs(this.format);
      let dataPlanes;
      if (this._data instanceof VideoSampleResource) {
        let result = this._data.getDataPlanes();
        if (result instanceof Promise) result = await result;
        if (!Array.isArray(result) || result.some((x) => !(x.data instanceof Uint8Array) || !Number.isInteger(x.stride) || x.stride < 0)) {
          throw new TypeError(
            'getDataPlanes() must return an array of objects with a Uint8Array "data" property and a non-negative integer "stride" property.'
          );
        }
        dataPlanes = result;
      } else if (this._data instanceof Uint8Array) {
        assert(this._layout);
        assert(this._layout.length === planeConfigs.length);
        dataPlanes = this._layout.map((planeLayout, i) => {
          const height = Math.ceil(this.codedHeight / planeConfigs[i].heightDivisor);
          return {
            data: this._data.subarray(
              planeLayout.offset,
              planeLayout.offset + planeLayout.stride * height
            ),
            stride: planeLayout.stride
          };
        });
      } else {
        const canvas = this._data;
        const context = canvas.getContext("2d");
        assert(context);
        const imageData = context.getImageData(0, 0, this.codedWidth, this.codedHeight);
        dataPlanes = [{
          data: toUint8Array(imageData.data),
          stride: 4 * this.codedWidth
        }];
      }
      const planeLayouts = [];
      const numPlanes = planeConfigs.length;
      for (let planeIndex = 0; planeIndex < numPlanes; planeIndex++) {
        const computedLayout = combinedLayout.computedLayouts[planeIndex];
        const sourceStride = dataPlanes[planeIndex].stride;
        const sourceData = dataPlanes[planeIndex].data;
        let sourceOffset = computedLayout.sourceTop * sourceStride;
        sourceOffset += computedLayout.sourceLeftBytes;
        let destinationOffset = computedLayout.destinationOffset;
        const rowBytes = computedLayout.sourceWidthBytes;
        const layout = {
          offset: destinationOffset,
          stride: computedLayout.destinationStride
        };
        for (let row = 0; row < computedLayout.sourceHeight; row++) {
          if (sourceOffset + rowBytes > sourceData.byteLength) {
            throw new Error(`Source buffer OOB read.`);
          }
          if (destinationOffset + rowBytes > destBytes.byteLength) {
            throw new Error(`Destination buffer OOB write.`);
          }
          const srcSub = sourceData.subarray(sourceOffset, sourceOffset + rowBytes);
          destBytes.set(srcSub, destinationOffset);
          sourceOffset += sourceStride;
          destinationOffset += computedLayout.destinationStride;
        }
        planeLayouts.push(layout);
      }
      if (options.format !== void 0) {
        const needsRgbConversion = this.format.startsWith("RGB") !== options.format.startsWith("RGB");
        const needsAlphaConversion = this.format.includes("X") && options.format.includes("A");
        if (needsRgbConversion || needsAlphaConversion) {
          for (let i = 0; i < combinedLayout.allocationSize; i += 4) {
            if (needsRgbConversion) {
              const r = destBytes[i];
              const b = destBytes[i + 2];
              destBytes[i] = b;
              destBytes[i + 2] = r;
            }
            if (needsAlphaConversion) {
              destBytes[i + 3] = 255;
            }
          }
        }
      }
      return planeLayouts;
    }
    /**
     * Converts this video sample to a VideoFrame for use with the WebCodecs API. The VideoFrame returned by this
     * method *must* be closed separately from this video sample.
     */
    toVideoFrame() {
      if (this._closed) {
        throw new Error("VideoSample is closed.");
      }
      assert(this._data !== null);
      if (this._data instanceof VideoSampleResource) {
        if (this.format === null) {
          throw new Error(
            "Cannot convert a VideoSampleResource-backed VideoSample to VideoFrame if format is null."
          );
        }
        const planes = this._data.getDataPlanes();
        if (planes instanceof Promise) {
          throw new Error(
            "Cannot convert a VideoSampleResource-backed VideoSample to VideoFrame if getDataPlanes() returns a promise."
          );
        }
        const size = planes.reduce((a, b) => a + b.data.byteLength, 0);
        const buffer = new Uint8Array(size);
        let offset = 0;
        const offsets = [];
        for (const plane of planes) {
          buffer.set(plane.data, offset);
          offsets.push(offset);
          offset += plane.data.byteLength;
        }
        return new VideoFrame(buffer, {
          format: this.format,
          layout: planes.map((x, i) => ({
            offset: offsets[i],
            stride: x.stride
          })),
          codedWidth: this.codedWidth,
          codedHeight: this.codedHeight,
          timestamp: this.microsecondTimestamp,
          duration: this.microsecondDuration,
          colorSpace: this.colorSpace,
          visibleRect: this.visibleRect,
          displayWidth: this.squarePixelWidth,
          // Not display* since we're not passing rotation
          displayHeight: this.squarePixelHeight
        });
      } else if (isVideoFrame(this._data)) {
        return new VideoFrame(this._data, {
          timestamp: this.microsecondTimestamp,
          duration: this.microsecondDuration || void 0
          // Drag 0 duration to undefined, glitches some codecs
        });
      } else if (this._data instanceof Uint8Array) {
        assert(this._layout);
        return new VideoFrame(this._data, {
          format: this.format,
          codedWidth: this.codedWidth,
          // This is technically wrong! codedWidth is a lie technically. But, since
          codedHeight: this.codedHeight,
          // we pass the layout (which contains the true coded width), we're good.
          layout: this._layout,
          timestamp: this.microsecondTimestamp,
          duration: this.microsecondDuration || void 0,
          colorSpace: this.colorSpace,
          visibleRect: this.visibleRect,
          displayWidth: this.squarePixelWidth,
          // Not display* since we're not passing rotation
          displayHeight: this.squarePixelHeight
        });
      } else {
        return new VideoFrame(this._data, {
          timestamp: this.microsecondTimestamp,
          duration: this.microsecondDuration || void 0
        });
      }
    }
    draw(context, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) {
      let sx = 0;
      let sy = 0;
      let sWidth = this.displayWidth;
      let sHeight = this.displayHeight;
      let dx = 0;
      let dy = 0;
      let dWidth = this.displayWidth;
      let dHeight = this.displayHeight;
      if (arg5 !== void 0) {
        sx = arg1;
        sy = arg2;
        sWidth = arg3;
        sHeight = arg4;
        dx = arg5;
        dy = arg6;
        if (arg7 !== void 0) {
          dWidth = arg7;
          dHeight = arg8;
        } else {
          dWidth = sWidth;
          dHeight = sHeight;
        }
      } else {
        dx = arg1;
        dy = arg2;
        if (arg3 !== void 0) {
          dWidth = arg3;
          dHeight = arg4;
        }
      }
      if (!(typeof CanvasRenderingContext2D !== "undefined" && context instanceof CanvasRenderingContext2D || typeof OffscreenCanvasRenderingContext2D !== "undefined" && context instanceof OffscreenCanvasRenderingContext2D)) {
        throw new TypeError("context must be a CanvasRenderingContext2D or OffscreenCanvasRenderingContext2D.");
      }
      if (!Number.isFinite(sx)) {
        throw new TypeError("sx must be a number.");
      }
      if (!Number.isFinite(sy)) {
        throw new TypeError("sy must be a number.");
      }
      if (!Number.isFinite(sWidth) || sWidth < 0) {
        throw new TypeError("sWidth must be a non-negative number.");
      }
      if (!Number.isFinite(sHeight) || sHeight < 0) {
        throw new TypeError("sHeight must be a non-negative number.");
      }
      if (!Number.isFinite(dx)) {
        throw new TypeError("dx must be a number.");
      }
      if (!Number.isFinite(dy)) {
        throw new TypeError("dy must be a number.");
      }
      if (!Number.isFinite(dWidth) || dWidth < 0) {
        throw new TypeError("dWidth must be a non-negative number.");
      }
      if (!Number.isFinite(dHeight) || dHeight < 0) {
        throw new TypeError("dHeight must be a non-negative number.");
      }
      if (this._closed) {
        throw new Error("VideoSample is closed.");
      }
      ({ sx, sy, sWidth, sHeight } = this._rotateSourceRegion(sx, sy, sWidth, sHeight, this.rotation));
      const source = this.toCanvasImageSource();
      context.save();
      const centerX = dx + dWidth / 2;
      const centerY = dy + dHeight / 2;
      context.translate(centerX, centerY);
      context.rotate(this.rotation * Math.PI / 180);
      const aspectRatioChange = this.rotation % 180 === 0 ? 1 : dWidth / dHeight;
      context.scale(1 / aspectRatioChange, aspectRatioChange);
      context.drawImage(
        source,
        sx,
        sy,
        sWidth,
        sHeight,
        -dWidth / 2,
        -dHeight / 2,
        dWidth,
        dHeight
      );
      context.restore();
    }
    /**
     * Draws the sample in the middle of the canvas corresponding to the context with the specified fit behavior.
     */
    drawWithFit(context, options) {
      if (!(typeof CanvasRenderingContext2D !== "undefined" && context instanceof CanvasRenderingContext2D || typeof OffscreenCanvasRenderingContext2D !== "undefined" && context instanceof OffscreenCanvasRenderingContext2D)) {
        throw new TypeError("context must be a CanvasRenderingContext2D or OffscreenCanvasRenderingContext2D.");
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!["fill", "contain", "cover"].includes(options.fit)) {
        throw new TypeError("options.fit must be 'fill', 'contain', or 'cover'.");
      }
      if (options.rotation !== void 0 && ![0, 90, 180, 270].includes(options.rotation)) {
        throw new TypeError("options.rotation, when provided, must be 0, 90, 180, or 270.");
      }
      if (options.crop !== void 0) {
        validateCropRectangle(options.crop, "options.");
      }
      const canvasWidth = context.canvas.width;
      const canvasHeight = context.canvas.height;
      const rotation = options.rotation ?? this.rotation;
      const [rotatedWidth, rotatedHeight] = rotation % 180 === 0 ? [this.squarePixelWidth, this.squarePixelHeight] : [this.squarePixelHeight, this.squarePixelWidth];
      let finalCrop = options.crop;
      if (finalCrop) {
        finalCrop = clampCropRectangle(finalCrop, rotatedWidth, rotatedHeight);
      }
      let dx;
      let dy;
      let newWidth;
      let newHeight;
      const { sx, sy, sWidth, sHeight } = this._rotateSourceRegion(
        options.crop?.left ?? 0,
        options.crop?.top ?? 0,
        options.crop?.width ?? rotatedWidth,
        options.crop?.height ?? rotatedHeight,
        rotation
      );
      if (options.fit === "fill") {
        dx = 0;
        dy = 0;
        newWidth = canvasWidth;
        newHeight = canvasHeight;
      } else {
        const [sampleWidth, sampleHeight] = options.crop ? [options.crop.width, options.crop.height] : [rotatedWidth, rotatedHeight];
        const scale = options.fit === "contain" ? Math.min(canvasWidth / sampleWidth, canvasHeight / sampleHeight) : Math.max(canvasWidth / sampleWidth, canvasHeight / sampleHeight);
        newWidth = sampleWidth * scale;
        newHeight = sampleHeight * scale;
        dx = (canvasWidth - newWidth) / 2;
        dy = (canvasHeight - newHeight) / 2;
      }
      context.save();
      const aspectRatioChange = rotation % 180 === 0 ? 1 : newWidth / newHeight;
      context.translate(canvasWidth / 2, canvasHeight / 2);
      context.rotate(rotation * Math.PI / 180);
      context.scale(1 / aspectRatioChange, aspectRatioChange);
      context.translate(-canvasWidth / 2, -canvasHeight / 2);
      context.drawImage(this.toCanvasImageSource(), sx, sy, sWidth, sHeight, dx, dy, newWidth, newHeight);
      context.restore();
    }
    /** @internal */
    _rotateSourceRegion(sx, sy, sWidth, sHeight, rotation) {
      if (rotation === 90) {
        [sx, sy, sWidth, sHeight] = [
          sy,
          this.squarePixelHeight - sx - sWidth,
          sHeight,
          sWidth
        ];
      } else if (rotation === 180) {
        [sx, sy] = [
          this.squarePixelWidth - sx - sWidth,
          this.squarePixelHeight - sy - sHeight
        ];
      } else if (rotation === 270) {
        [sx, sy, sWidth, sHeight] = [
          this.squarePixelWidth - sy - sHeight,
          sx,
          sHeight,
          sWidth
        ];
      }
      return { sx, sy, sWidth, sHeight };
    }
    /**
     * Draws the sample onto the target canvas with fit behavior, manually mipmapping on strong downscales for quality.
     * @internal
     */
    _drawWithFitAndMipmapping(targetCanvas, targetContext, options) {
      const targetWidth = targetCanvas.width;
      const targetHeight = targetCanvas.height;
      const [rotatedWidth, rotatedHeight] = options.rotation % 180 === 0 ? [this.squarePixelWidth, this.squarePixelHeight] : [this.squarePixelHeight, this.squarePixelWidth];
      const sourceWidth = options.crop ? options.crop.width : rotatedWidth;
      const sourceHeight = options.crop ? options.crop.height : rotatedHeight;
      let mipLevels = 0;
      if (2 * targetWidth < sourceWidth && 2 * targetHeight < sourceHeight) {
        mipLevels = Math.floor(Math.log2(
          Math.min(sourceWidth / targetWidth, sourceHeight / targetHeight)
        ));
      }
      const drawWidth = targetWidth * 2 ** mipLevels;
      const drawHeight = targetHeight * 2 ** mipLevels;
      const { canvas, context, isNew } = mipLevels > 0 ? getTransformationCanvas(drawWidth, drawHeight) : { canvas: targetCanvas, context: targetContext, isNew: options.targetIsFresh };
      context.imageSmoothingQuality = "high";
      if (options.fillBlack) {
        context.fillStyle = "black";
        context.fillRect(0, 0, drawWidth, drawHeight);
      } else if (!isNew) {
        context.clearRect(0, 0, drawWidth, drawHeight);
      }
      this.drawWithFit(context, {
        fit: options.fit,
        rotation: options.rotation,
        crop: options.crop
      });
      context.globalCompositeOperation = "copy";
      for (let i = mipLevels; i > 1; i--) {
        const levelWidth = targetWidth * 2 ** i;
        const levelHeight = targetHeight * 2 ** i;
        context.drawImage(canvas, 0, 0, levelWidth, levelHeight, 0, 0, levelWidth / 2, levelHeight / 2);
      }
      context.globalCompositeOperation = "source-over";
      if (mipLevels > 0) {
        targetContext.imageSmoothingQuality = "high";
        targetContext.globalCompositeOperation = "copy";
        targetContext.drawImage(
          canvas,
          0,
          0,
          2 * targetWidth,
          2 * targetHeight,
          0,
          0,
          targetWidth,
          targetHeight
        );
        targetContext.globalCompositeOperation = "source-over";
      }
    }
    /**
     * Converts this video sample to a
     * [`CanvasImageSource`](https://udn.realityripple.com/docs/Web/API/CanvasImageSource) for drawing to a canvas.
     *
     * You must use the value returned by this method immediately, as any VideoFrame created internally may
     * automatically be closed in the next microtask.
     */
    toCanvasImageSource() {
      if (this._closed) {
        throw new Error("VideoSample is closed.");
      }
      assert(this._data !== null);
      if (this._data instanceof VideoSampleResource || this._data instanceof Uint8Array) {
        const videoFrame = this.toVideoFrame();
        queueMicrotask(() => videoFrame.close());
        return videoFrame;
      } else {
        return this._data;
      }
    }
    /**
     * Transform this video sample to a new video sample given the options. Can be used to resize, rotate, and crop
     * the sample.
     *
     * In non-browser environments, this method will not work by default. To make it work, register a custom
     * transformer function via {@link registerVideoSampleTransformer}.
     */
    async transform(options) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.width !== void 0 && (!Number.isInteger(options.width) || options.width <= 0)) {
        throw new TypeError("options.width, when provided, must be a positive integer.");
      }
      if (options.height !== void 0 && (!Number.isInteger(options.height) || options.height <= 0)) {
        throw new TypeError("options.height, when provided, must be a positive integer.");
      }
      if (options.roundDimensionsTo !== void 0 && (!Number.isInteger(options.roundDimensionsTo) || options.roundDimensionsTo <= 0)) {
        throw new TypeError("options.roundDimensionsTo, when provided, must be a positive integer.");
      }
      if (options.fit !== void 0 && !["fill", "contain", "cover"].includes(options.fit)) {
        throw new TypeError('options.fit, when provided, must be one of "fill", "contain", or "cover".');
      }
      if (options.width !== void 0 && options.height !== void 0 && options.fit === void 0) {
        throw new TypeError(
          "When both options.width and options.height are provided, options.fit must also be provided."
        );
      }
      if (options.rotate !== void 0 && ![0, 90, 180, 270].includes(options.rotate)) {
        throw new TypeError("options.rotate, when provided, must be 0, 90, 180 or 270.");
      }
      if (options.crop !== void 0) {
        validateCropRectangle(options.crop, "options.");
      }
      if (options.alpha !== void 0 && !["keep", "discard"].includes(options.alpha)) {
        throw new TypeError("options.alpha, when provided, must be 'keep' or 'discard'.");
      }
      const rotation = normalizeRotation(this.rotation + (options.rotate ?? 0));
      const [rotatedWidth, rotatedHeight] = rotation % 180 === 0 ? [this.squarePixelWidth, this.squarePixelHeight] : [this.squarePixelHeight, this.squarePixelWidth];
      let finalCrop = options.crop;
      if (finalCrop) {
        finalCrop = clampCropRectangle(finalCrop, rotatedWidth, rotatedHeight);
      }
      const cropWidth = finalCrop ? finalCrop.width : rotatedWidth;
      const cropHeight = finalCrop ? finalCrop.height : rotatedHeight;
      const originalAspectRatio = cropWidth / cropHeight;
      let targetWidth;
      let targetHeight;
      if (options.width !== void 0 && options.height === void 0) {
        targetWidth = options.width;
        targetHeight = targetWidth / originalAspectRatio;
      } else if (options.width === void 0 && options.height !== void 0) {
        targetHeight = options.height;
        targetWidth = targetHeight * originalAspectRatio;
      } else if (options.width !== void 0 && options.height !== void 0) {
        targetWidth = options.width;
        targetHeight = options.height;
      } else {
        targetWidth = cropWidth;
        targetHeight = cropHeight;
      }
      targetWidth = roundToMultiple(targetWidth, options.roundDimensionsTo ?? 1);
      targetHeight = roundToMultiple(targetHeight, options.roundDimensionsTo ?? 1);
      const description = {
        width: targetWidth,
        height: targetHeight,
        fit: options.fit ?? "fill",
        rotation,
        crop: finalCrop ?? {
          left: 0,
          top: 0,
          width: rotatedWidth,
          height: rotatedHeight
        },
        alpha: options.alpha ?? "keep"
      };
      for (const transformer of registeredVideoSampleTransformers) {
        let result = transformer(this, description);
        if (result instanceof Promise) result = await result;
        if (result !== null) {
          return result;
        }
      }
      const { canvas, context, isNew } = getTransformationCanvas(description.width, description.height);
      this._drawWithFitAndMipmapping(canvas, context, {
        fit: description.fit,
        rotation: description.rotation,
        crop: description.crop,
        targetIsFresh: isNew,
        fillBlack: description.alpha === "discard"
      });
      return new _VideoSample(canvas, {
        timestamp: this.timestamp,
        duration: this.duration,
        rotation: 0
        // Any previous rotation is now baked in
      });
    }
    /** Sets the rotation metadata of this video sample. */
    setRotation(newRotation) {
      if (![0, 90, 180, 270].includes(newRotation)) {
        throw new TypeError("newRotation must be 0, 90, 180, or 270.");
      }
      this.rotation = newRotation;
    }
    /** Sets the presentation timestamp of this video sample, in seconds. */
    setTimestamp(newTimestamp) {
      if (!Number.isFinite(newTimestamp)) {
        throw new TypeError("newTimestamp must be a number.");
      }
      this.timestamp = newTimestamp;
    }
    /** Sets the duration of this video sample, in seconds. */
    setDuration(newDuration) {
      if (!Number.isFinite(newDuration) || newDuration < 0) {
        throw new TypeError("newDuration must be a non-negative number.");
      }
      this.duration = newDuration;
    }
    /** Sets the encode options used when this sample is passed to an encoder. */
    setEncodeOptions(newEncodeOptions) {
      if (!newEncodeOptions || typeof newEncodeOptions !== "object") {
        throw new TypeError("newEncodeOptions must be an object.");
      }
      this.encodeOptions = newEncodeOptions;
    }
    /** Calls `.close()`. */
    [Symbol.dispose]() {
      this.close();
    }
  };
  var registeredVideoSampleTransformers = [];
  var registerVideoSampleTransformer = (transformer) => {
    if (registeredVideoSampleTransformers.includes(transformer)) {
      return;
    }
    registeredVideoSampleTransformers.push(transformer);
  };
  var TRANSFORMATION_CANVAS_CACHE_MAX_SIZE = 3;
  var transformationCanvasCache = [];
  var transformationCanvasCacheNextAge = 0;
  var getTransformationCanvas = (width, height) => {
    for (const entry of transformationCanvasCache) {
      if (entry.canvas.width === width && entry.canvas.height === height) {
        entry.age = transformationCanvasCacheNextAge++;
        return { canvas: entry.canvas, context: entry.context, isNew: false };
      }
    }
    let canvas;
    if (typeof OffscreenCanvas !== "undefined") {
      canvas = new OffscreenCanvas(width, height);
    } else {
      if (typeof window === "undefined" || typeof document === "undefined") {
        throw new Error(
          "Cannot transform VideoSamples in this environment. Either run in an environment with OffscreenCanvas or HTMLCanvasElement, or supply a custom VideoSample transformer using registerVideoSampleTransformer()."
        );
      }
      canvas = document.createElement("canvas");
      canvas.width = width;
      canvas.height = height;
    }
    const context = canvas.getContext("2d", {
      alpha: true,
      willReadFrequently: false
    });
    if (!context) {
      throw new Error(
        "The '2d' canvas context is required to transform VideoSamples. Register a custom transformer using registerVideoSampleTransformer to work around this limitation."
      );
    }
    if (transformationCanvasCache.length >= TRANSFORMATION_CANVAS_CACHE_MAX_SIZE) {
      transformationCanvasCache.splice(arrayArgmin(transformationCanvasCache, (x) => x.age), 1);
    }
    transformationCanvasCache.push({
      canvas,
      context,
      age: transformationCanvasCacheNextAge++
    });
    return { canvas, context, isNew: true };
  };
  var VideoSampleColorSpace = class {
    /** Creates a new VideoSampleColorSpace. */
    constructor(init) {
      if (init !== void 0) {
        if (!init || typeof init !== "object") {
          throw new TypeError("init.colorSpace, when provided, must be an object.");
        }
        const primariesValues = Object.keys(COLOR_PRIMARIES_MAP);
        if (init.primaries != null && !primariesValues.includes(init.primaries)) {
          throw new TypeError(
            `init.colorSpace.primaries, when provided, must be one of ${primariesValues.join(", ")}.`
          );
        }
        const transferValues = Object.keys(TRANSFER_CHARACTERISTICS_MAP);
        if (init.transfer != null && !transferValues.includes(init.transfer)) {
          throw new TypeError(
            `init.colorSpace.transfer, when provided, must be one of ${transferValues.join(", ")}.`
          );
        }
        const matrixValues = Object.keys(MATRIX_COEFFICIENTS_MAP);
        if (init.matrix != null && !matrixValues.includes(init.matrix)) {
          throw new TypeError(
            `init.colorSpace.matrix, when provided, must be one of ${matrixValues.join(", ")}.`
          );
        }
        if (init.fullRange != null && typeof init.fullRange !== "boolean") {
          throw new TypeError("init.colorSpace.fullRange, when provided, must be a boolean.");
        }
      }
      this.primaries = init?.primaries ?? null;
      this.transfer = init?.transfer ?? null;
      this.matrix = init?.matrix ?? null;
      this.fullRange = init?.fullRange ?? null;
    }
    /** Serializes the color space to a JSON object. */
    toJSON() {
      return {
        primaries: this.primaries,
        transfer: this.transfer,
        matrix: this.matrix,
        fullRange: this.fullRange
      };
    }
  };
  var isVideoFrame = (x) => {
    return typeof VideoFrame !== "undefined" && x instanceof VideoFrame;
  };
  var clampCropRectangle = (crop, outerWidth, outerHeight) => {
    const left = Math.min(crop.left, outerWidth);
    const top = Math.min(crop.top, outerHeight);
    const width = Math.min(crop.width, outerWidth - left);
    const height = Math.min(crop.height, outerHeight - top);
    assert(width >= 0);
    assert(height >= 0);
    return { left, top, width, height };
  };
  var validateCropRectangle = (crop, prefix) => {
    if (!crop || typeof crop !== "object") {
      throw new TypeError(prefix + "crop, when provided, must be an object.");
    }
    if (!Number.isInteger(crop.left) || crop.left < 0) {
      throw new TypeError(prefix + "crop.left must be a non-negative integer.");
    }
    if (!Number.isInteger(crop.top) || crop.top < 0) {
      throw new TypeError(prefix + "crop.top must be a non-negative integer.");
    }
    if (!Number.isInteger(crop.width) || crop.width < 0) {
      throw new TypeError(prefix + "crop.width must be a non-negative integer.");
    }
    if (!Number.isInteger(crop.height) || crop.height < 0) {
      throw new TypeError(prefix + "crop.height must be a non-negative integer.");
    }
  };
  var validateVideoFrameCopyToOptions = (options) => {
    if (!options || typeof options !== "object") {
      throw new TypeError("options must be an object.");
    }
    if (options.colorSpace !== void 0 && !["display-p3", "srgb"].includes(options.colorSpace)) {
      throw new TypeError("options.colorSpace, when provided, must be 'display-p3' or 'srgb'.");
    }
    if (options.format !== void 0 && typeof options.format !== "string") {
      throw new TypeError("options.format, when provided, must be a string.");
    }
    if (options.layout !== void 0) {
      if (!Array.isArray(options.layout)) {
        throw new TypeError("options.layout, when provided, must be an array.");
      }
      for (const plane of options.layout) {
        if (!plane || typeof plane !== "object") {
          throw new TypeError("Each entry in options.layout must be an object.");
        }
        if (!Number.isInteger(plane.offset) || plane.offset < 0) {
          throw new TypeError("plane.offset must be a non-negative integer.");
        }
        if (!Number.isInteger(plane.stride) || plane.stride < 0) {
          throw new TypeError("plane.stride must be a non-negative integer.");
        }
      }
    }
    if (options.rect !== void 0) {
      if (!options.rect || typeof options.rect !== "object") {
        throw new TypeError("options.rect, when provided, must be an object.");
      }
      if (options.rect.x !== void 0 && (!Number.isInteger(options.rect.x) || options.rect.x < 0)) {
        throw new TypeError("options.rect.x, when provided, must be a non-negative integer.");
      }
      if (options.rect.y !== void 0 && (!Number.isInteger(options.rect.y) || options.rect.y < 0)) {
        throw new TypeError("options.rect.y, when provided, must be a non-negative integer.");
      }
      if (options.rect.width !== void 0 && (!Number.isInteger(options.rect.width) || options.rect.width < 0)) {
        throw new TypeError("options.rect.width, when provided, must be a non-negative integer.");
      }
      if (options.rect.height !== void 0 && (!Number.isInteger(options.rect.height) || options.rect.height < 0)) {
        throw new TypeError("options.rect.height, when provided, must be a non-negative integer.");
      }
    }
  };
  var createDefaultPlaneLayout = (format, codedWidth, codedHeight) => {
    const planes = getPlaneConfigs(format);
    const layouts = [];
    let currentOffset = 0;
    for (const plane of planes) {
      const planeWidth = Math.ceil(codedWidth / plane.widthDivisor);
      const planeHeight = Math.ceil(codedHeight / plane.heightDivisor);
      const stride = planeWidth * plane.sampleBytes;
      const planeSize = stride * planeHeight;
      layouts.push({
        offset: currentOffset,
        stride
      });
      currentOffset += planeSize;
    }
    return layouts;
  };
  var getPlaneConfigs = (format) => {
    const yuv = (yBytes, uvBytes, subX, subY, hasAlpha) => {
      const configs = [
        { sampleBytes: yBytes, widthDivisor: 1, heightDivisor: 1 },
        { sampleBytes: uvBytes, widthDivisor: subX, heightDivisor: subY },
        { sampleBytes: uvBytes, widthDivisor: subX, heightDivisor: subY }
      ];
      if (hasAlpha) {
        configs.push({ sampleBytes: yBytes, widthDivisor: 1, heightDivisor: 1 });
      }
      return configs;
    };
    switch (format) {
      case "I420":
        return yuv(1, 1, 2, 2, false);
      case "I420P10":
      case "I420P12":
        return yuv(2, 2, 2, 2, false);
      case "I420A":
        return yuv(1, 1, 2, 2, true);
      case "I420AP10":
      case "I420AP12":
        return yuv(2, 2, 2, 2, true);
      case "I422":
        return yuv(1, 1, 2, 1, false);
      case "I422P10":
      case "I422P12":
        return yuv(2, 2, 2, 1, false);
      case "I422A":
        return yuv(1, 1, 2, 1, true);
      case "I422AP10":
      case "I422AP12":
        return yuv(2, 2, 2, 1, true);
      case "I444":
        return yuv(1, 1, 1, 1, false);
      case "I444P10":
      case "I444P12":
        return yuv(2, 2, 1, 1, false);
      case "I444A":
        return yuv(1, 1, 1, 1, true);
      case "I444AP10":
      case "I444AP12":
        return yuv(2, 2, 1, 1, true);
      case "NV12":
        return [
          { sampleBytes: 1, widthDivisor: 1, heightDivisor: 1 },
          { sampleBytes: 2, widthDivisor: 2, heightDivisor: 2 }
          // Interleaved U and V
        ];
      case "RGBA":
      case "RGBX":
      case "BGRA":
      case "BGRX":
        return [
          { sampleBytes: 4, widthDivisor: 1, heightDivisor: 1 }
        ];
      default:
        assertNever(format);
        assert(false);
    }
  };
  var ParseVideoFrameCopyToOptions = (sample, options) => {
    const defaultRect = {
      left: 0,
      top: 0,
      width: sample.codedWidth,
      height: sample.codedHeight
    };
    const overrideRect = options.rect;
    const parsedRect = ParseVisibleRect(
      defaultRect,
      overrideRect,
      sample.codedWidth,
      sample.codedHeight,
      sample.format
    );
    const optLayout = options.layout;
    let format;
    if (!options.format || options.format === sample.format) {
      format = sample.format;
    } else if (["RGBA", "RGBX", "BGRA", "BGRX"].includes(options.format)) {
      format = options.format;
    } else {
      throw new Error("NotSupportedError: Invalid destination format.");
    }
    return ComputeLayoutAndAllocationSize(parsedRect, format, optLayout);
  };
  var ParseVisibleRect = (defaultRect, overrideRect, codedWidth, codedHeight, format) => {
    const sourceRect = { ...defaultRect };
    if (overrideRect !== void 0) {
      if (overrideRect.width === 0 || overrideRect.height === 0) {
        throw new TypeError("visibleRect dimensions cannot be zero.");
      }
      if ((overrideRect.x || 0) + (overrideRect.width || 0) > codedWidth) {
        throw new TypeError("visibleRect exceeds codedWidth.");
      }
      if ((overrideRect.y || 0) + (overrideRect.height || 0) > codedHeight) {
        throw new TypeError("visibleRect exceeds codedHeight.");
      }
      sourceRect.x = overrideRect.x || 0;
      sourceRect.y = overrideRect.y || 0;
      sourceRect.width = overrideRect.width || 0;
      sourceRect.height = overrideRect.height || 0;
    }
    const validAlignment = VerifyRectOffsetAlignment(format, sourceRect);
    if (!validAlignment) {
      throw new TypeError("visibleRect alignment is invalid for the format.");
    }
    return sourceRect;
  };
  var VerifyRectOffsetAlignment = (format, rect) => {
    if (format === null) return true;
    const planes = getPlaneConfigs(format);
    for (let planeIndex = 0; planeIndex < planes.length; planeIndex++) {
      const plane = planes[planeIndex];
      const sampleWidth = plane.widthDivisor;
      const sampleHeight = plane.heightDivisor;
      if ((rect.x || 0) % sampleWidth !== 0) return false;
      if ((rect.y || 0) % sampleHeight !== 0) return false;
    }
    return true;
  };
  var ComputeLayoutAndAllocationSize = (parsedRect, format, layout) => {
    const planes = getPlaneConfigs(format);
    const numPlanes = planes.length;
    if (layout !== void 0 && layout.length !== numPlanes) {
      throw new TypeError(`Layout must have ${numPlanes} planes.`);
    }
    let minAllocationSize = 0;
    const computedLayouts = [];
    const endOffsets = [];
    for (let planeIndex = 0; planeIndex < numPlanes; planeIndex++) {
      const plane = planes[planeIndex];
      const sampleBytes = plane.sampleBytes;
      const sampleWidth = plane.widthDivisor;
      const sampleHeight = plane.heightDivisor;
      const computedLayout = {
        destinationOffset: 0,
        destinationStride: 0,
        sourceTop: 0,
        sourceHeight: 0,
        sourceLeftBytes: 0,
        sourceWidthBytes: 0
      };
      computedLayout.sourceTop = Math.ceil(Math.trunc(parsedRect.y || 0) / sampleHeight);
      computedLayout.sourceHeight = Math.ceil(Math.trunc(parsedRect.height || 0) / sampleHeight);
      computedLayout.sourceLeftBytes = Math.floor(Math.trunc(parsedRect.x || 0) / sampleWidth) * sampleBytes;
      computedLayout.sourceWidthBytes = Math.floor(Math.trunc(parsedRect.width || 0) / sampleWidth) * sampleBytes;
      if (layout !== void 0) {
        const planeLayout = layout[planeIndex];
        if (planeLayout.stride < computedLayout.sourceWidthBytes) {
          throw new TypeError(`Stride for plane ${planeIndex} is too small.`);
        }
        computedLayout.destinationOffset = planeLayout.offset;
        computedLayout.destinationStride = planeLayout.stride;
      } else {
        computedLayout.destinationOffset = minAllocationSize;
        computedLayout.destinationStride = computedLayout.sourceWidthBytes;
      }
      const planeSize = computedLayout.destinationStride * computedLayout.sourceHeight;
      const planeEnd = planeSize + computedLayout.destinationOffset;
      if (planeEnd > 4294967295) {
        throw new TypeError("Allocation size exceeds limit.");
      }
      endOffsets.push(planeEnd);
      minAllocationSize = Math.max(minAllocationSize, planeEnd);
      for (let earlierPlaneIndex = 0; earlierPlaneIndex < planeIndex; earlierPlaneIndex++) {
        const earlierLayout = computedLayouts[earlierPlaneIndex];
        if (endOffsets[planeIndex] <= earlierLayout.destinationOffset || endOffsets[earlierPlaneIndex] <= computedLayout.destinationOffset) {
          continue;
        }
        throw new TypeError("Planes overlap.");
      }
      computedLayouts.push(computedLayout);
    }
    return {
      allocationSize: minAllocationSize,
      computedLayouts
    };
  };
  var AUDIO_SAMPLE_FORMATS = /* @__PURE__ */ new Set(
    ["f32", "f32-planar", "s16", "s16-planar", "s32", "s32-planar", "u8", "u8-planar"]
  );
  var AudioSampleResource = class {
    constructor() {
      /** @internal */
      this._referenceCount = 0;
    }
  };
  var AudioSample = class _AudioSample {
    constructor(init) {
      /** @internal */
      this._closed = false;
      if (isAudioData(init)) {
        if (init.format === null) {
          throw new TypeError("AudioData with null format is not supported.");
        }
        this._data = init;
        this.format = init.format;
        this.sampleRate = init.sampleRate;
        this.numberOfFrames = init.numberOfFrames;
        this.numberOfChannels = init.numberOfChannels;
        this.timestamp = init.timestamp / 1e6;
        this.duration = init.numberOfFrames / init.sampleRate;
      } else if (init instanceof AudioSampleResource) {
        this._data = init;
        init._referenceCount++;
        this.format = init.getFormat();
        if (!AUDIO_SAMPLE_FORMATS.has(this.format)) {
          throw new TypeError("getFormat() must return an AudioSampleFormat.");
        }
        this.sampleRate = init.getSampleRate();
        if (!Number.isInteger(this.sampleRate) || this.sampleRate <= 0) {
          throw new TypeError("getSampleRate() must return a positive integer.");
        }
        this.numberOfFrames = init.getNumberOfFrames();
        if (!Number.isInteger(this.numberOfFrames) || this.numberOfFrames < 0) {
          throw new TypeError("getNumberOfFrames() must return a non-negative integer.");
        }
        this.numberOfChannels = init.getNumberOfChannels();
        if (!Number.isInteger(this.numberOfChannels) || this.numberOfChannels <= 0) {
          throw new TypeError("getNumberOfChannels() must return a positive integer.");
        }
        this.timestamp = init.getTimestamp();
        if (!Number.isFinite(this.timestamp)) {
          throw new TypeError("getTimestamp() must return a finite number.");
        }
        this.duration = this.numberOfFrames / this.sampleRate;
      } else {
        if (!init || typeof init !== "object") {
          throw new TypeError("Invalid AudioDataInit: must be an object.");
        }
        if (!AUDIO_SAMPLE_FORMATS.has(init.format)) {
          throw new TypeError("Invalid AudioDataInit: invalid format.");
        }
        if (!Number.isFinite(init.sampleRate) || init.sampleRate <= 0) {
          throw new TypeError("Invalid AudioDataInit: sampleRate must be > 0.");
        }
        if (!Number.isInteger(init.numberOfChannels) || init.numberOfChannels === 0) {
          throw new TypeError("Invalid AudioDataInit: numberOfChannels must be an integer > 0.");
        }
        if (!Number.isFinite(init?.timestamp)) {
          throw new TypeError("init.timestamp must be a number.");
        }
        const numberOfFrames = init.data.byteLength / (getBytesPerSample(init.format) * init.numberOfChannels);
        if (!Number.isInteger(numberOfFrames)) {
          throw new TypeError("Invalid AudioDataInit: data size is not a multiple of frame size.");
        }
        this.format = init.format;
        this.sampleRate = init.sampleRate;
        this.numberOfFrames = numberOfFrames;
        this.numberOfChannels = init.numberOfChannels;
        this.timestamp = init.timestamp;
        this.duration = numberOfFrames / init.sampleRate;
        let dataBuffer;
        if (init.data instanceof ArrayBuffer) {
          dataBuffer = new Uint8Array(init.data);
        } else if (ArrayBuffer.isView(init.data)) {
          dataBuffer = new Uint8Array(init.data.buffer, init.data.byteOffset, init.data.byteLength);
        } else {
          throw new TypeError("Invalid AudioDataInit: data is not a BufferSource.");
        }
        const expectedSize = this.numberOfFrames * this.numberOfChannels * getBytesPerSample(this.format);
        if (dataBuffer.byteLength < expectedSize) {
          throw new TypeError("Invalid AudioDataInit: insufficient data size.");
        }
        this._data = dataBuffer;
      }
      finalizationRegistry?.register(this, { type: "audio", data: this._data }, this);
    }
    /** The presentation timestamp of the sample in microseconds. */
    get microsecondTimestamp() {
      return Math.trunc(SECOND_TO_MICROSECOND_FACTOR * this.timestamp);
    }
    /** The duration of the sample in microseconds. */
    get microsecondDuration() {
      return Math.trunc(SECOND_TO_MICROSECOND_FACTOR * this.duration);
    }
    /** Returns the number of bytes required to hold the audio sample's data as specified by the given options. */
    allocationSize(options) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!Number.isInteger(options.planeIndex) || options.planeIndex < 0) {
        throw new TypeError("planeIndex must be a non-negative integer.");
      }
      if (options.format !== void 0 && !AUDIO_SAMPLE_FORMATS.has(options.format)) {
        throw new TypeError("Invalid format.");
      }
      if (options.frameOffset !== void 0 && (!Number.isInteger(options.frameOffset) || options.frameOffset < 0)) {
        throw new TypeError("frameOffset must be a non-negative integer.");
      }
      if (options.frameCount !== void 0 && (!Number.isInteger(options.frameCount) || options.frameCount < 0)) {
        throw new TypeError("frameCount must be a non-negative integer.");
      }
      if (this._closed) {
        throw new Error("AudioSample is closed.");
      }
      const destFormat = options.format ?? this.format;
      const frameOffset = options.frameOffset ?? 0;
      if (frameOffset >= this.numberOfFrames) {
        throw new RangeError("frameOffset out of range");
      }
      const copyFrameCount = options.frameCount !== void 0 ? options.frameCount : this.numberOfFrames - frameOffset;
      if (copyFrameCount > this.numberOfFrames - frameOffset) {
        throw new RangeError("frameCount out of range");
      }
      const bytesPerSample = getBytesPerSample(destFormat);
      const isPlanar = formatIsPlanar(destFormat);
      if (isPlanar && options.planeIndex >= this.numberOfChannels) {
        throw new RangeError("planeIndex out of range");
      }
      if (!isPlanar && options.planeIndex !== 0) {
        throw new RangeError("planeIndex out of range");
      }
      const elementCount = isPlanar ? copyFrameCount : copyFrameCount * this.numberOfChannels;
      return elementCount * bytesPerSample;
    }
    /** Copies the audio sample's data to an ArrayBuffer or ArrayBufferView as specified by the given options. */
    copyTo(destination, options) {
      if (!isAllowSharedBufferSource(destination)) {
        throw new TypeError("destination must be an ArrayBuffer or an ArrayBuffer view.");
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!Number.isInteger(options.planeIndex) || options.planeIndex < 0) {
        throw new TypeError("planeIndex must be a non-negative integer.");
      }
      if (options.format !== void 0 && !AUDIO_SAMPLE_FORMATS.has(options.format)) {
        throw new TypeError("Invalid format.");
      }
      if (options.frameOffset !== void 0 && (!Number.isInteger(options.frameOffset) || options.frameOffset < 0)) {
        throw new TypeError("frameOffset must be a non-negative integer.");
      }
      if (options.frameCount !== void 0 && (!Number.isInteger(options.frameCount) || options.frameCount < 0)) {
        throw new TypeError("frameCount must be a non-negative integer.");
      }
      if (this._closed) {
        throw new Error("AudioSample is closed.");
      }
      const { format, frameCount: optFrameCount, frameOffset: optFrameOffset } = options;
      let { planeIndex } = options;
      const srcFormat = this.format;
      const destFormat = format ?? this.format;
      if (!destFormat) throw new Error("Destination format not determined");
      const numFrames = this.numberOfFrames;
      const numChannels = this.numberOfChannels;
      const frameOffset = optFrameOffset ?? 0;
      if (frameOffset >= numFrames) {
        throw new RangeError("frameOffset out of range");
      }
      const copyFrameCount = optFrameCount !== void 0 ? optFrameCount : numFrames - frameOffset;
      if (copyFrameCount > numFrames - frameOffset) {
        throw new RangeError("frameCount out of range");
      }
      const destBytesPerSample = getBytesPerSample(destFormat);
      const destIsPlanar = formatIsPlanar(destFormat);
      if (destIsPlanar && planeIndex >= numChannels) {
        throw new RangeError("planeIndex out of range");
      }
      if (!destIsPlanar && planeIndex !== 0) {
        throw new RangeError("planeIndex out of range");
      }
      const destElementCount = destIsPlanar ? copyFrameCount : copyFrameCount * numChannels;
      const requiredSize = destElementCount * destBytesPerSample;
      if (destination.byteLength < requiredSize) {
        throw new RangeError("Destination buffer is too small");
      }
      const destView = toDataView(destination);
      const writeFn = getWriteFunction(destFormat);
      if (isAudioData(this._data)) {
        if (isWebKit() && numChannels > 2 && destFormat !== srcFormat) {
          doAudioDataCopyToWebKitWorkaround(
            this._data,
            destView,
            srcFormat,
            destFormat,
            numChannels,
            planeIndex,
            frameOffset,
            copyFrameCount
          );
        } else {
          this._data.copyTo(destination, {
            planeIndex,
            frameOffset,
            frameCount: copyFrameCount,
            format: destFormat
          });
        }
      } else {
        const readFn = getReadFunction(srcFormat);
        const srcBytesPerSample = getBytesPerSample(srcFormat);
        const srcIsPlanar = formatIsPlanar(srcFormat);
        let uint8Data;
        if (this._data instanceof AudioSampleResource) {
          const getDataPlaneValidated = (index) => {
            const result = this._data.getDataPlane(index);
            if (!(result instanceof Uint8Array)) {
              throw new TypeError("getDataPlane() must return a Uint8Array.");
            }
            const expectedSize = numFrames * srcBytesPerSample * (srcIsPlanar ? 1 : numChannels);
            if (result.byteLength !== expectedSize) {
              throw new TypeError(
                `Data plane ${index} has invalid size. Expected exactly ${expectedSize} bytes, got ${result.byteLength} bytes.`
              );
            }
            return result;
          };
          if (srcIsPlanar) {
            if (destIsPlanar) {
              uint8Data = getDataPlaneValidated(planeIndex);
              planeIndex = 0;
            } else {
              uint8Data = new Uint8Array(numFrames * srcBytesPerSample * numChannels);
              for (let ch = 0; ch < numChannels; ch++) {
                const planeData = getDataPlaneValidated(ch);
                uint8Data.set(planeData, ch * numFrames * srcBytesPerSample);
              }
            }
          } else {
            uint8Data = getDataPlaneValidated(0);
          }
        } else {
          uint8Data = this._data;
        }
        const srcView = toDataView(uint8Data);
        for (let i = 0; i < copyFrameCount; i++) {
          if (destIsPlanar) {
            const destOffset = i * destBytesPerSample;
            let srcOffset;
            if (srcIsPlanar) {
              srcOffset = (planeIndex * numFrames + (i + frameOffset)) * srcBytesPerSample;
            } else {
              srcOffset = ((i + frameOffset) * numChannels + planeIndex) * srcBytesPerSample;
            }
            const normalized = readFn(srcView, srcOffset);
            writeFn(destView, destOffset, normalized);
          } else {
            for (let ch = 0; ch < numChannels; ch++) {
              const destIndex = i * numChannels + ch;
              const destOffset = destIndex * destBytesPerSample;
              let srcOffset;
              if (srcIsPlanar) {
                srcOffset = (ch * numFrames + (i + frameOffset)) * srcBytesPerSample;
              } else {
                srcOffset = ((i + frameOffset) * numChannels + ch) * srcBytesPerSample;
              }
              const normalized = readFn(srcView, srcOffset);
              writeFn(destView, destOffset, normalized);
            }
          }
        }
      }
    }
    /** Clones this audio sample. */
    clone() {
      if (this._closed) {
        throw new Error("AudioSample is closed.");
      }
      if (this._data instanceof AudioSampleResource) {
        const sample = new _AudioSample(this._data);
        sample.setTimestamp(this.timestamp);
        return sample;
      } else if (isAudioData(this._data)) {
        const sample = new _AudioSample(this._data.clone());
        sample.setTimestamp(this.timestamp);
        return sample;
      } else {
        return new _AudioSample({
          format: this.format,
          sampleRate: this.sampleRate,
          numberOfFrames: this.numberOfFrames,
          numberOfChannels: this.numberOfChannels,
          timestamp: this.timestamp,
          data: this._data
        });
      }
    }
    /**
     * Returns a new {@link AudioSample} containing only the frames in the range [startSample, endSample). Both bounds
     * must lie within this sample's range of frames. The returned sample's timestamp is shifted to match the start of
     * the trimmed section.
     */
    trim(startSample, endSample = this.numberOfFrames) {
      if (!Number.isInteger(startSample) || startSample < 0) {
        throw new TypeError("startSample must be a non-negative integer.");
      }
      if (!Number.isInteger(endSample) || endSample < 0) {
        throw new TypeError("endSample must be a non-negative integer.");
      }
      if (startSample > this.numberOfFrames) {
        throw new RangeError("startSample out of range.");
      }
      if (endSample > this.numberOfFrames) {
        throw new RangeError("endSample out of range.");
      }
      if (endSample < startSample) {
        throw new RangeError("endSample must not be less than startSample.");
      }
      if (this._closed) {
        throw new Error("AudioSample is closed.");
      }
      const frameCount = endSample - startSample;
      const bytesPerSample = getBytesPerSample(this.format);
      let data;
      if (formatIsPlanar(this.format)) {
        const planeSize = frameCount * bytesPerSample;
        data = new Uint8Array(planeSize * this.numberOfChannels);
        if (frameCount > 0) {
          for (let i = 0; i < this.numberOfChannels; i++) {
            this.copyTo(data.subarray(i * planeSize, (i + 1) * planeSize), {
              planeIndex: i,
              format: this.format,
              frameOffset: startSample,
              frameCount
            });
          }
        }
      } else {
        data = new Uint8Array(frameCount * this.numberOfChannels * bytesPerSample);
        if (frameCount > 0) {
          this.copyTo(data, {
            planeIndex: 0,
            format: this.format,
            frameOffset: startSample,
            frameCount
          });
        }
      }
      return new _AudioSample({
        data,
        format: this.format,
        sampleRate: this.sampleRate,
        numberOfChannels: this.numberOfChannels,
        timestamp: this.timestamp + startSample / this.sampleRate
      });
    }
    /**
     * Closes this audio sample, releasing held resources. Audio samples should be closed as soon as they are not
     * needed anymore.
     */
    close() {
      if (this._closed) {
        return;
      }
      finalizationRegistry?.unregister(this);
      if (this._data instanceof AudioSampleResource) {
        this._data._referenceCount--;
        if (this._data._referenceCount === 0) {
          this._data.close();
        }
      } else if (isAudioData(this._data)) {
        this._data.close();
      } else {
        this._data = new Uint8Array(0);
      }
      this._closed = true;
    }
    /**
     * Converts this audio sample to an AudioData for use with the WebCodecs API. The AudioData returned by this
     * method *must* be closed separately from this audio sample.
     */
    toAudioData() {
      if (this._closed) {
        throw new Error("AudioSample is closed.");
      }
      if (this._data instanceof AudioSampleResource) {
        return this._createAudioDataFromData();
      } else if (isAudioData(this._data)) {
        if (this._data.timestamp === this.microsecondTimestamp) {
          return this._data.clone();
        } else {
          return this._createAudioDataFromData();
        }
      } else {
        return new AudioData({
          format: this.format,
          sampleRate: this.sampleRate,
          numberOfFrames: this.numberOfFrames,
          numberOfChannels: this.numberOfChannels,
          timestamp: this.microsecondTimestamp,
          data: this._data.buffer instanceof ArrayBuffer ? this._data.buffer : this._data.slice()
          // In the case of SharedArrayBuffer, convert to ArrayBuffer
        });
      }
    }
    /** @internal */
    _createAudioDataFromData() {
      if (formatIsPlanar(this.format)) {
        const size = this.allocationSize({ planeIndex: 0, format: this.format });
        const data = new ArrayBuffer(size * this.numberOfChannels);
        for (let i = 0; i < this.numberOfChannels; i++) {
          this.copyTo(new Uint8Array(data, i * size, size), { planeIndex: i, format: this.format });
        }
        return new AudioData({
          format: this.format,
          sampleRate: this.sampleRate,
          numberOfFrames: this.numberOfFrames,
          numberOfChannels: this.numberOfChannels,
          timestamp: this.microsecondTimestamp,
          data
        });
      } else {
        const data = new ArrayBuffer(this.allocationSize({ planeIndex: 0, format: this.format }));
        this.copyTo(data, { planeIndex: 0, format: this.format });
        return new AudioData({
          format: this.format,
          sampleRate: this.sampleRate,
          numberOfFrames: this.numberOfFrames,
          numberOfChannels: this.numberOfChannels,
          timestamp: this.microsecondTimestamp,
          data
        });
      }
    }
    /** Convert this audio sample to an AudioBuffer for use with the Web Audio API. */
    toAudioBuffer() {
      if (this._closed) {
        throw new Error("AudioSample is closed.");
      }
      const audioBuffer = new AudioBuffer({
        numberOfChannels: this.numberOfChannels,
        length: this.numberOfFrames,
        sampleRate: this.sampleRate
      });
      const dataBytes = new Float32Array(this.allocationSize({ planeIndex: 0, format: "f32-planar" }) / 4);
      for (let i = 0; i < this.numberOfChannels; i++) {
        this.copyTo(dataBytes, { planeIndex: i, format: "f32-planar" });
        audioBuffer.copyToChannel(dataBytes, i);
      }
      return audioBuffer;
    }
    /** Sets the presentation timestamp of this audio sample, in seconds. */
    setTimestamp(newTimestamp) {
      if (!Number.isFinite(newTimestamp)) {
        throw new TypeError("newTimestamp must be a number.");
      }
      this.timestamp = newTimestamp;
    }
    /** Calls `.close()`. */
    [Symbol.dispose]() {
      this.close();
    }
    /** @internal */
    static *_fromAudioBuffer(audioBuffer, timestamp) {
      if (!(audioBuffer instanceof AudioBuffer)) {
        throw new TypeError("audioBuffer must be an AudioBuffer.");
      }
      const MAX_FLOAT_COUNT = 48e3 * 5;
      const numberOfChannels = audioBuffer.numberOfChannels;
      const sampleRate = audioBuffer.sampleRate;
      const totalFrames = audioBuffer.length;
      const maxFramesPerChunk = Math.floor(MAX_FLOAT_COUNT / numberOfChannels);
      let currentRelativeFrame = 0;
      let remainingFrames = totalFrames;
      while (remainingFrames > 0) {
        const framesToCopy = Math.min(maxFramesPerChunk, remainingFrames);
        const chunkData = new Float32Array(numberOfChannels * framesToCopy);
        for (let channel = 0; channel < numberOfChannels; channel++) {
          audioBuffer.copyFromChannel(
            chunkData.subarray(channel * framesToCopy, (channel + 1) * framesToCopy),
            channel,
            currentRelativeFrame
          );
        }
        yield new _AudioSample({
          format: "f32-planar",
          sampleRate,
          numberOfFrames: framesToCopy,
          numberOfChannels,
          timestamp: timestamp + currentRelativeFrame / sampleRate,
          data: chunkData
        });
        currentRelativeFrame += framesToCopy;
        remainingFrames -= framesToCopy;
      }
    }
    /**
     * Creates AudioSamples from an AudioBuffer, starting at the given timestamp in seconds. Typically creates exactly
     * one sample, but may create multiple if the AudioBuffer is exceedingly large.
     */
    static fromAudioBuffer(audioBuffer, timestamp) {
      if (!(audioBuffer instanceof AudioBuffer)) {
        throw new TypeError("audioBuffer must be an AudioBuffer.");
      }
      const MAX_FLOAT_COUNT = 48e3 * 5;
      const numberOfChannels = audioBuffer.numberOfChannels;
      const sampleRate = audioBuffer.sampleRate;
      const totalFrames = audioBuffer.length;
      const maxFramesPerChunk = Math.floor(MAX_FLOAT_COUNT / numberOfChannels);
      let currentRelativeFrame = 0;
      let remainingFrames = totalFrames;
      const result = [];
      while (remainingFrames > 0) {
        const framesToCopy = Math.min(maxFramesPerChunk, remainingFrames);
        const chunkData = new Float32Array(numberOfChannels * framesToCopy);
        for (let channel = 0; channel < numberOfChannels; channel++) {
          audioBuffer.copyFromChannel(
            chunkData.subarray(channel * framesToCopy, (channel + 1) * framesToCopy),
            channel,
            currentRelativeFrame
          );
        }
        const audioSample = new _AudioSample({
          format: "f32-planar",
          sampleRate,
          numberOfFrames: framesToCopy,
          numberOfChannels,
          timestamp: timestamp + currentRelativeFrame / sampleRate,
          data: chunkData
        });
        result.push(audioSample);
        currentRelativeFrame += framesToCopy;
        remainingFrames -= framesToCopy;
      }
      return result;
    }
  };
  var getBytesPerSample = (format) => {
    switch (format) {
      case "u8":
      case "u8-planar":
        return 1;
      case "s16":
      case "s16-planar":
        return 2;
      case "s32":
      case "s32-planar":
        return 4;
      case "f32":
      case "f32-planar":
        return 4;
      default:
        throw new Error("Unknown AudioSampleFormat");
    }
  };
  var formatIsPlanar = (format) => {
    switch (format) {
      case "u8-planar":
      case "s16-planar":
      case "s32-planar":
      case "f32-planar":
        return true;
      default:
        return false;
    }
  };
  var getReadFunction = (format) => {
    switch (format) {
      case "u8":
      case "u8-planar":
        return (view2, offset) => (view2.getUint8(offset) - 128) / 128;
      case "s16":
      case "s16-planar":
        return (view2, offset) => view2.getInt16(offset, true) / 32768;
      case "s32":
      case "s32-planar":
        return (view2, offset) => view2.getInt32(offset, true) / 2147483648;
      case "f32":
      case "f32-planar":
        return (view2, offset) => view2.getFloat32(offset, true);
    }
  };
  var getWriteFunction = (format) => {
    switch (format) {
      case "u8":
      case "u8-planar":
        return (view2, offset, value) => view2.setUint8(offset, clamp((value + 1) * 127.5, 0, 255));
      case "s16":
      case "s16-planar":
        return (view2, offset, value) => view2.setInt16(offset, clamp(Math.round(value * 32767), -32768, 32767), true);
      case "s32":
      case "s32-planar":
        return (view2, offset, value) => view2.setInt32(offset, clamp(Math.round(value * 2147483647), -2147483648, 2147483647), true);
      case "f32":
      case "f32-planar":
        return (view2, offset, value) => view2.setFloat32(offset, value, true);
    }
  };
  var isAudioData = (x) => {
    return typeof AudioData !== "undefined" && x instanceof AudioData;
  };
  var toInterleavedAudioFormat = (format) => {
    switch (format) {
      case "u8-planar":
        return "u8";
      case "s16-planar":
        return "s16";
      case "s32-planar":
        return "s32";
      case "f32-planar":
        return "f32";
      default:
        return format;
    }
  };
  var doAudioDataCopyToWebKitWorkaround = (audioData, destView, srcFormat, destFormat, numChannels, planeIndex, frameOffset, copyFrameCount) => {
    const readFn = getReadFunction(srcFormat);
    const writeFn = getWriteFunction(destFormat);
    const srcBytesPerSample = getBytesPerSample(srcFormat);
    const destBytesPerSample = getBytesPerSample(destFormat);
    const srcIsPlanar = formatIsPlanar(srcFormat);
    const destIsPlanar = formatIsPlanar(destFormat);
    if (destIsPlanar) {
      if (srcIsPlanar) {
        const data = new ArrayBuffer(copyFrameCount * srcBytesPerSample);
        const dataView = toDataView(data);
        audioData.copyTo(data, {
          planeIndex,
          frameOffset,
          frameCount: copyFrameCount,
          format: srcFormat
        });
        for (let i = 0; i < copyFrameCount; i++) {
          const srcOffset = i * srcBytesPerSample;
          const destOffset = i * destBytesPerSample;
          const sample = readFn(dataView, srcOffset);
          writeFn(destView, destOffset, sample);
        }
      } else {
        const data = new ArrayBuffer(copyFrameCount * numChannels * srcBytesPerSample);
        const dataView = toDataView(data);
        audioData.copyTo(data, {
          planeIndex: 0,
          frameOffset,
          frameCount: copyFrameCount,
          format: srcFormat
        });
        for (let i = 0; i < copyFrameCount; i++) {
          const srcOffset = (i * numChannels + planeIndex) * srcBytesPerSample;
          const destOffset = i * destBytesPerSample;
          const sample = readFn(dataView, srcOffset);
          writeFn(destView, destOffset, sample);
        }
      }
    } else {
      if (srcIsPlanar) {
        const planeSize = copyFrameCount * srcBytesPerSample;
        const data = new ArrayBuffer(planeSize);
        const dataView = toDataView(data);
        for (let ch = 0; ch < numChannels; ch++) {
          audioData.copyTo(data, {
            planeIndex: ch,
            frameOffset,
            frameCount: copyFrameCount,
            format: srcFormat
          });
          for (let i = 0; i < copyFrameCount; i++) {
            const srcOffset = i * srcBytesPerSample;
            const destOffset = (i * numChannels + ch) * destBytesPerSample;
            const sample = readFn(dataView, srcOffset);
            writeFn(destView, destOffset, sample);
          }
        }
      } else {
        const data = new ArrayBuffer(copyFrameCount * numChannels * srcBytesPerSample);
        const dataView = toDataView(data);
        audioData.copyTo(data, {
          planeIndex: 0,
          frameOffset,
          frameCount: copyFrameCount,
          format: srcFormat
        });
        for (let i = 0; i < copyFrameCount; i++) {
          for (let ch = 0; ch < numChannels; ch++) {
            const idx = i * numChannels + ch;
            const srcOffset = idx * srcBytesPerSample;
            const destOffset = idx * destBytesPerSample;
            const sample = readFn(dataView, srcOffset);
            writeFn(destView, destOffset, sample);
          }
        }
      }
    }
  };
  var audioSampleToInterleavedFormat = (sample, format) => {
    const size = sample.allocationSize({ format, planeIndex: 0 });
    const buffer = new ArrayBuffer(size);
    sample.copyTo(buffer, { format, planeIndex: 0 });
    return new AudioSample({
      data: buffer,
      format,
      numberOfChannels: sample.numberOfChannels,
      sampleRate: sample.sampleRate,
      timestamp: sample.timestamp,
      duration: sample.duration
    });
  };

  // src/encode.ts
  var canEncodeVideoMemo = /* @__PURE__ */ new Map();
  var canEncodeAudioMemo = /* @__PURE__ */ new Map();
  var validateVideoEncodingConfig = (config) => {
    if (!config || typeof config !== "object") {
      throw new TypeError("Encoding config must be an object.");
    }
    if (!VIDEO_CODECS.includes(config.codec)) {
      throw new TypeError(`Invalid video codec '${config.codec}'. Must be one of: ${VIDEO_CODECS.join(", ")}.`);
    }
    const bitrate = config.bitrate;
    if (config.quality === void 0 && bitrate === void 0) {
      throw new TypeError("config.quality must be provided.");
    }
    if (config.quality !== void 0 && bitrate !== void 0) {
      throw new TypeError("config.quality and config.bitrate cannot both be provided.");
    }
    if (config.quality !== void 0 && !(config.quality instanceof Quality)) {
      throw new TypeError("config.quality, when provided, must be a Quality.");
    }
    if (bitrate !== void 0 && !(bitrate instanceof Quality) && (!Number.isInteger(bitrate) || bitrate <= 0)) {
      throw new TypeError("config.bitrate, when provided, must be a positive integer or a quality.");
    }
    if (config.keyFrameInterval !== void 0 && (!Number.isFinite(config.keyFrameInterval) || config.keyFrameInterval < 0)) {
      throw new TypeError("config.keyFrameInterval, when provided, must be a non-negative number.");
    }
    if (config.sizeChangeBehavior !== void 0 && !["deny", "passThrough", "fill", "contain", "cover"].includes(config.sizeChangeBehavior)) {
      throw new TypeError(
        "config.sizeChangeBehavior, when provided, must be 'deny', 'passThrough', 'fill', 'contain' or 'cover'."
      );
    }
    if (config.transform !== void 0) {
      if (typeof config.transform !== "object" || !config.transform) {
        throw new TypeError("config.transform, when provided, must be an object.");
      }
      if (config.transform.width !== void 0 && (!Number.isInteger(config.transform.width) || config.transform.width <= 0)) {
        throw new TypeError("config.transform.width, when provided, must be a positive integer.");
      }
      if (config.transform.height !== void 0 && (!Number.isInteger(config.transform.height) || config.transform.height <= 0)) {
        throw new TypeError("config.transform.height, when provided, must be a positive integer.");
      }
      if (config.transform.fit !== void 0 && !["fill", "contain", "cover"].includes(config.transform.fit)) {
        throw new TypeError('config.transform.fit, when provided, must be one of "fill", "contain", or "cover".');
      }
      if (config.transform.width !== void 0 && config.transform.height !== void 0 && config.transform.fit === void 0 && !["fill", "contain", "cover"].includes(config.sizeChangeBehavior)) {
        throw new TypeError(
          "When both config.transform.width and config.transform.height are provided, config.transform.fit must also be provided."
        );
      }
      if (config.transform.fit !== void 0 && ["fill", "contain", "cover"].includes(config.sizeChangeBehavior) && config.transform.fit !== config.sizeChangeBehavior) {
        throw new TypeError(
          "config.transform.fit, when provided, cannot differ from config.sizeChangeBehavior when config.sizeChangeBehavior is 'fill', 'contain' or 'cover', as sizeChangeBehavior already determines the fitting algorithm."
        );
      }
      if (config.transform.rotate !== void 0 && ![0, 90, 180, 270].includes(config.transform.rotate)) {
        throw new TypeError("config.transform.rotate, when provided, must be 0, 90, 180 or 270.");
      }
      if (config.transform.crop !== void 0) {
        validateCropRectangle(config.transform.crop, "config.transform.");
      }
      if (config.transform.process !== void 0 && typeof config.transform.process !== "function") {
        throw new TypeError("config.transform.process, when provided, must be a function.");
      }
      if (config.transform.frameRate !== void 0 && (!Number.isFinite(config.transform.frameRate) || config.transform.frameRate <= 0)) {
        throw new TypeError("config.transform.frameRate, when provided, must be a finite positive number.");
      }
      if (config.transform.force !== void 0 && typeof config.transform.force !== "boolean") {
        throw new TypeError("config.transform.force, when provided, must be a boolean.");
      }
    }
    if (config.onEncodedPacket !== void 0 && typeof config.onEncodedPacket !== "function") {
      throw new TypeError("config.onEncodedPacket, when provided, must be a function.");
    }
    if (config.onEncoderConfig !== void 0 && typeof config.onEncoderConfig !== "function") {
      throw new TypeError("config.onEncoderConfig, when provided, must be a function.");
    }
    if (config.onEncodedSample !== void 0 && typeof config.onEncodedSample !== "function") {
      throw new TypeError("config.onEncodedSample, when provided, must be a function.");
    }
    validateVideoEncodingAdditionalOptions(config.codec, config);
  };
  var validateVideoEncodingAdditionalOptions = (codec, options) => {
    if (!options || typeof options !== "object") {
      throw new TypeError("Encoding options must be an object.");
    }
    if (options.alpha !== void 0 && !["discard", "keep"].includes(options.alpha)) {
      throw new TypeError("options.alpha, when provided, must be 'discard' or 'keep'.");
    }
    const bitrateMode = options.bitrateMode;
    if (bitrateMode !== void 0 && !["constant", "variable"].includes(bitrateMode)) {
      throw new TypeError("bitrateMode, when provided, must be 'constant' or 'variable'.");
    }
    if (options.latencyMode !== void 0 && !["quality", "realtime"].includes(options.latencyMode)) {
      throw new TypeError("latencyMode, when provided, must be 'quality' or 'realtime'.");
    }
    if (options.fullCodecString !== void 0 && typeof options.fullCodecString !== "string") {
      throw new TypeError("fullCodecString, when provided, must be a string.");
    }
    if (options.fullCodecString !== void 0 && inferCodecFromCodecString(options.fullCodecString) !== codec) {
      throw new TypeError(
        `fullCodecString, when provided, must be a string that matches the specified codec (${codec}).`
      );
    }
    if (options.hardwareAcceleration !== void 0 && !["no-preference", "prefer-hardware", "prefer-software"].includes(options.hardwareAcceleration)) {
      throw new TypeError(
        "hardwareAcceleration, when provided, must be 'no-preference', 'prefer-hardware' or 'prefer-software'."
      );
    }
    if (options.scalabilityMode !== void 0 && typeof options.scalabilityMode !== "string") {
      throw new TypeError("scalabilityMode, when provided, must be a string.");
    }
    if (options.contentHint !== void 0 && typeof options.contentHint !== "string") {
      throw new TypeError("contentHint, when provided, must be a string.");
    }
  };
  var buildVideoEncoderConfigs = (options) => {
    const fallbackBitrateMode = options.bitrateMode;
    const rateControl = options.quality._toVideoRateControl(
      options.codec,
      options.width,
      options.height,
      fallbackBitrateMode
    );
    const buildConfig = (bitrate, bitrateMode, bitrateEstimate) => ({
      codec: options.fullCodecString ?? buildVideoCodecString(
        options.codec,
        options.width,
        options.height,
        bitrateEstimate,
        options.alpha === "keep"
      ),
      width: options.width,
      height: options.height,
      displayWidth: options.squarePixelWidth,
      displayHeight: options.squarePixelHeight,
      bitrate,
      bitrateMode,
      alpha: options.alpha ?? "discard",
      framerate: options.framerate,
      latencyMode: options.latencyMode,
      hardwareAcceleration: options.hardwareAcceleration,
      scalabilityMode: options.scalabilityMode,
      contentHint: options.contentHint,
      ...getVideoEncoderConfigExtension(options.codec)
    });
    const candidates = [];
    if (rateControl.quantizer !== null) {
      candidates.push({
        config: buildConfig(void 0, "quantizer", rateControl.bitrate),
        quantizer: rateControl.quantizer
      });
    }
    if (rateControl.bitrateMode !== "quantizer") {
      candidates.push({
        config: buildConfig(rateControl.bitrate, rateControl.bitrateMode, rateControl.bitrate),
        quantizer: null
      });
    }
    assert(candidates.length > 0);
    return candidates;
  };
  var validateAudioEncodingConfig = (config) => {
    if (!config || typeof config !== "object") {
      throw new TypeError("Encoding config must be an object.");
    }
    if (!AUDIO_CODECS.includes(config.codec)) {
      throw new TypeError(`Invalid audio codec '${config.codec}'. Must be one of: ${AUDIO_CODECS.join(", ")}.`);
    }
    const bitrate = config.bitrate;
    if (config.quality === void 0 && bitrate === void 0 && !(PCM_AUDIO_CODECS.includes(config.codec) || config.codec === "flac")) {
      throw new TypeError("config.quality must be provided for compressed audio codecs.");
    }
    if (config.quality !== void 0 && bitrate !== void 0) {
      throw new TypeError("config.quality and config.bitrate cannot both be provided.");
    }
    if (config.quality !== void 0 && !(config.quality instanceof Quality)) {
      throw new TypeError("config.quality, when provided, must be a Quality.");
    }
    if (bitrate !== void 0 && !(bitrate instanceof Quality) && (!Number.isInteger(bitrate) || bitrate <= 0)) {
      throw new TypeError("config.bitrate, when provided, must be a positive integer or a quality.");
    }
    if (config.transform !== void 0) {
      if (typeof config.transform !== "object" || !config.transform) {
        throw new TypeError("config.transform, when provided, must be an object.");
      }
      if (config.transform.numberOfChannels !== void 0 && (!Number.isInteger(config.transform.numberOfChannels) || config.transform.numberOfChannels <= 0)) {
        throw new TypeError("config.transform.numberOfChannels, when provided, must be a positive integer.");
      }
      if (config.transform.sampleRate !== void 0 && (!Number.isInteger(config.transform.sampleRate) || config.transform.sampleRate <= 0)) {
        throw new TypeError("config.transform.sampleRate, when provided, must be a positive integer.");
      }
      if (config.transform.sampleFormat !== void 0 && !["u8", "s16", "s32", "f32"].includes(config.transform.sampleFormat)) {
        throw new TypeError("config.transform.sampleFormat, when provided, must be one of: u8, s16, s32, f32.");
      }
      if (config.transform.process !== void 0 && typeof config.transform.process !== "function") {
        throw new TypeError("config.transform.process, when provided, must be a function.");
      }
    }
    if (config.onEncodedPacket !== void 0 && typeof config.onEncodedPacket !== "function") {
      throw new TypeError("config.onEncodedPacket, when provided, must be a function.");
    }
    if (config.onEncoderConfig !== void 0 && typeof config.onEncoderConfig !== "function") {
      throw new TypeError("config.onEncoderConfig, when provided, must be a function.");
    }
    if (config.onEncodedSample !== void 0 && typeof config.onEncodedSample !== "function") {
      throw new TypeError("config.onEncodedSample, when provided, must be a function.");
    }
    validateAudioEncodingAdditionalOptions(config.codec, config);
  };
  var validateAudioEncodingAdditionalOptions = (codec, options) => {
    if (!options || typeof options !== "object") {
      throw new TypeError("Encoding options must be an object.");
    }
    const bitrateMode = options.bitrateMode;
    if (bitrateMode !== void 0 && !["constant", "variable"].includes(bitrateMode)) {
      throw new TypeError("bitrateMode, when provided, must be 'constant' or 'variable'.");
    }
    if (options.fullCodecString !== void 0 && typeof options.fullCodecString !== "string") {
      throw new TypeError("fullCodecString, when provided, must be a string.");
    }
    if (options.fullCodecString !== void 0 && inferCodecFromCodecString(options.fullCodecString) !== codec) {
      throw new TypeError(
        `fullCodecString, when provided, must be a string that matches the specified codec (${codec}).`
      );
    }
  };
  var buildAudioEncoderConfig = (options) => {
    const fallbackBitrateMode = options.bitrateMode;
    return {
      codec: options.fullCodecString ?? buildAudioCodecString(
        options.codec,
        options.numberOfChannels,
        options.sampleRate
      ),
      numberOfChannels: options.numberOfChannels,
      sampleRate: options.sampleRate,
      bitrate: options.quality?._toAudioBitrate(options.codec),
      bitrateMode: options.quality?._bitrateMode ?? fallbackBitrateMode,
      ...getAudioEncoderConfigExtension(options.codec)
    };
  };
  var Quality = class {
    constructor(options) {
      if (typeof options === "number" || typeof options === "string") {
        options = { quality: options };
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.bitrateMode !== void 0 && !["constant", "variable"].includes(options.bitrateMode)) {
        throw new TypeError("options.bitrateMode, when provided, must be 'constant' or 'variable'.");
      }
      if ("quality" in options) {
        if (typeof options.quality === "string" ? !(options.quality in QUALITY_LEVELS) : typeof options.quality !== "number" || Number.isNaN(options.quality)) {
          throw new TypeError(
            "options.quality must be a number, or one of 'very-low', 'low', 'medium', 'high' or 'very-high'."
          );
        }
        if (options.preferBitrate !== void 0 && typeof options.preferBitrate !== "boolean") {
          throw new TypeError("options.preferBitrate, when provided, must be a boolean.");
        }
        if ("bitrate" in options || "quantizer" in options) {
          throw new TypeError("options.quality cannot be combined with options.bitrate or options.quantizer.");
        }
        this._quality = typeof options.quality === "string" ? QUALITY_LEVELS[options.quality] : options.quality;
        this._preferBitrate = options.preferBitrate ?? false;
        this._bitrate = void 0;
        this._quantizer = void 0;
      } else {
        if (options.bitrate !== void 0 && (!Number.isInteger(options.bitrate) || options.bitrate <= 0)) {
          throw new TypeError("options.bitrate, when provided, must be a positive integer.");
        }
        if (options.quantizer !== void 0 && (!Number.isInteger(options.quantizer) || options.quantizer < 0)) {
          throw new TypeError("options.quantizer, when provided, must be a non-negative integer.");
        }
        if (options.bitrate === void 0 && options.quantizer === void 0) {
          throw new TypeError("At least one of options.bitrate or options.quantizer must be set.");
        }
        if ("preferBitrate" in options) {
          throw new TypeError("options.preferBitrate can only be combined with options.quality.");
        }
        this._quality = void 0;
        this._preferBitrate = false;
        this._bitrate = options.bitrate;
        this._quantizer = options.quantizer;
      }
      this._bitrateMode = options.bitrateMode;
    }
    /**
     * Determines the rate control methods usable for the given codec.
     * @internal
     */
    _toVideoRateControl(codec, width, height, fallbackBitrateMode) {
      const quantizerSupport = VIDEO_CODEC_QUANTIZER_SUPPORT[codec];
      let quantizer = null;
      let bitrateMode = this._bitrateMode ?? fallbackBitrateMode ?? "variable";
      if (this._quantizer !== void 0) {
        if (!quantizerSupport) {
          if (this._bitrate === void 0) {
            throw new Error(
              `Codec '${codec}' does not support quantizer-based encoding. Provide a bitrate in the Quality to define a fallback.`
            );
          }
        } else if (this._quantizer < quantizerSupport.min || this._quantizer > quantizerSupport.max) {
          if (this._bitrate === void 0) {
            throw new Error(
              `Quantizer ${this._quantizer} is out of range for codec '${codec}'; must be between ${quantizerSupport.min} and ${quantizerSupport.max}.`
            );
          }
        } else {
          quantizer = this._quantizer;
          if (this._bitrate === void 0) {
            bitrateMode = "quantizer";
          }
        }
      } else if (this._bitrate === void 0 && quantizerSupport && !this._preferBitrate) {
        assert(this._quality !== void 0);
        quantizer = clamp(
          Math.round(lerp(quantizerSupport.worst, quantizerSupport.best, this._quality)),
          quantizerSupport.min,
          quantizerSupport.max
        );
      }
      let bitrate;
      if (this._bitrate !== void 0) {
        bitrate = this._bitrate;
      } else {
        let quality = this._quality;
        if (quality === void 0) {
          assert(quantizer !== null && quantizerSupport);
          quality = clamp(
            (quantizer - quantizerSupport.worst) / (quantizerSupport.best - quantizerSupport.worst),
            0,
            1
          );
        }
        bitrate = computeVideoBitrate(codec, width, height, qualityToBitrateFactor(quality));
      }
      return { quantizer, bitrate, bitrateMode };
    }
    /** @internal */
    _toVideoBitrate(codec, width, height) {
      if (this._bitrate !== void 0) {
        return this._bitrate;
      }
      assert(this._quality !== void 0);
      return computeVideoBitrate(codec, width, height, qualityToBitrateFactor(this._quality));
    }
    /** @internal */
    _toAudioBitrate(codec) {
      if (PCM_AUDIO_CODECS.includes(codec) || codec === "flac") {
        return void 0;
      }
      if (this._bitrate !== void 0) {
        return this._bitrate;
      }
      if (this._quality === void 0) {
        throw new Error(
          "This Quality defines neither a quality level nor a bitrate and therefore cannot be used for audio encoding."
        );
      }
      const factor = qualityToBitrateFactor(this._quality);
      const baseRates = {
        aac: 128e3,
        // 128kbps base for AAC
        opus: 64e3,
        // 64kbps base for Opus
        mp3: 16e4,
        // 160kbps base for MP3
        vorbis: 64e3,
        // 64kbps base for Vorbis
        ac3: 384e3,
        // 384kbps base for AC-3
        eac3: 192e3
        // 192kbps base for E-AC-3
      };
      const baseBitrate = baseRates[codec];
      if (!baseBitrate) {
        throw new Error(`Unhandled codec: ${codec}`);
      }
      let finalBitrate = baseBitrate * factor;
      if (codec === "aac") {
        const validRates = [96e3, 128e3, 16e4, 192e3];
        finalBitrate = validRates.reduce(
          (prev, curr) => Math.abs(curr - finalBitrate) < Math.abs(prev - finalBitrate) ? curr : prev
        );
      } else if (codec === "opus" || codec === "vorbis") {
        finalBitrate = Math.max(6e3, finalBitrate);
      } else if (codec === "mp3") {
        const validRates = [
          8e3,
          16e3,
          24e3,
          32e3,
          4e4,
          48e3,
          64e3,
          8e4,
          96e3,
          112e3,
          128e3,
          16e4,
          192e3,
          224e3,
          256e3,
          32e4
        ];
        finalBitrate = validRates.reduce(
          (prev, curr) => Math.abs(curr - finalBitrate) < Math.abs(prev - finalBitrate) ? curr : prev
        );
      }
      return Math.round(finalBitrate / 1e3) * 1e3;
    }
  };
  var QUALITY_LEVELS = {
    "very-low": 0,
    "low": 0.25,
    "medium": 0.5,
    "high": 0.75,
    "very-high": 1
  };
  var VIDEO_CODEC_QUANTIZER_SUPPORT = {
    avc: { min: 0, max: 51, worst: 41, best: 16 },
    hevc: { min: 0, max: 51, worst: 41, best: 16 },
    vp9: { min: 0, max: 63, worst: 52, best: 20 },
    av1: { min: 0, max: 255, worst: 208, best: 80 }
  };
  var qualityToBitrateFactor = (quality) => 0.3 * Math.exp(2.5538 * quality);
  var computeVideoBitrate = (codec, width, height, factor) => {
    const pixels = width * height;
    const referencePixels = 1920 * 1080;
    const referenceBitrate = 3e6;
    const scaleFactor = Math.pow(pixels / referencePixels, 0.95);
    const baseBitrate = referenceBitrate * scaleFactor;
    const codecEfficiencyFactors = {
      avc: 1,
      // H.264/AVC (baseline)
      hevc: 0.6,
      // H.265/HEVC (~40% more efficient than AVC)
      vp9: 0.6,
      // Similar to HEVC
      av1: 0.4,
      // ~60% more efficient than AVC
      vp8: 1.2,
      // Slightly less efficient than AVC
      prores: 22e7 / referenceBitrate
      // Apple ProRes white paper claims 220 Mbps for 1080p 422 HQ @30Hz
    };
    const codecAdjustedBitrate = baseBitrate * codecEfficiencyFactors[codec];
    const finalBitrate = codecAdjustedBitrate * factor;
    return Math.ceil(finalBitrate / 1e3) * 1e3;
  };
  var buildQuantizerEncodeOptions = (codec, quantizer) => {
    if (codec === "avc") {
      return { avc: { quantizer } };
    } else if (codec === "hevc") {
      return { hevc: { quantizer } };
    } else if (codec === "vp9") {
      return { vp9: { quantizer } };
    } else if (codec === "av1") {
      return { av1: { quantizer } };
    }
    assert(false);
  };
  var QUALITY_VERY_LOW = /* @__PURE__ */ new Quality("very-low");
  var QUALITY_LOW = /* @__PURE__ */ new Quality("low");
  var QUALITY_MEDIUM = /* @__PURE__ */ new Quality("medium");
  var QUALITY_HIGH = /* @__PURE__ */ new Quality("high");
  var QUALITY_VERY_HIGH = /* @__PURE__ */ new Quality("very-high");
  var canEncode = (codec) => {
    if (VIDEO_CODECS.includes(codec)) {
      return canEncodeVideo(codec);
    } else if (AUDIO_CODECS.includes(codec)) {
      return canEncodeAudio(codec);
    } else if (SUBTITLE_CODECS.includes(codec)) {
      return canEncodeSubtitles(codec);
    }
    throw new TypeError(`Unknown codec '${codec}'.`);
  };
  var canEncodeVideo = async (codec, options = {}) => {
    const {
      width = 1280,
      height = 720,
      quality,
      // eslint-disable-next-line @typescript-eslint/no-deprecated
      bitrate,
      ...restOptions
    } = options;
    if (!VIDEO_CODECS.includes(codec)) {
      return false;
    }
    if (!Number.isInteger(width) || width <= 0) {
      throw new TypeError("width must be a positive integer.");
    }
    if (!Number.isInteger(height) || height <= 0) {
      throw new TypeError("height must be a positive integer.");
    }
    if (quality !== void 0 && !(quality instanceof Quality)) {
      throw new TypeError("quality, when provided, must be a Quality.");
    }
    if (quality !== void 0 && bitrate !== void 0) {
      throw new TypeError("quality and bitrate cannot both be provided.");
    }
    if (bitrate !== void 0 && !(bitrate instanceof Quality) && (!Number.isInteger(bitrate) || bitrate <= 0)) {
      throw new TypeError("bitrate must be a positive integer or a quality.");
    }
    validateVideoEncodingAdditionalOptions(codec, restOptions);
    const resolvedQuality = resolveQuality(quality, bitrate) ?? new Quality({ bitrate: 1e6 });
    let candidates;
    try {
      candidates = buildVideoEncoderConfigs({
        codec,
        width,
        height,
        quality: resolvedQuality,
        framerate: void 0,
        ...restOptions,
        alpha: "discard"
        // Since we handle alpha ourselves
      });
    } catch {
      return false;
    }
    const key = JSON.stringify(candidates);
    const memoized = canEncodeVideoMemo.get(key);
    if (memoized) {
      return memoized;
    }
    const promise = (async () => {
      for (const { config } of candidates) {
        if (customVideoEncoders.some((x) => x.supports(codec, config))) {
          return true;
        }
      }
      if (typeof VideoEncoder === "undefined") {
        return false;
      }
      const hasOddDimension = width % 2 === 1 || height % 2 === 1;
      if (hasOddDimension && (codec === "avc" || codec === "hevc")) {
        return false;
      }
      for (const { config, quantizer } of candidates) {
        try {
          const support = await VideoEncoder.isConfigSupported(config);
          if (!support.supported) {
            continue;
          }
        } catch {
          continue;
        }
        if (!isFirefox()) {
          return true;
        }
        const success = await new Promise(async (resolve) => {
          try {
            const encoder = new VideoEncoder({
              output: () => {
              },
              error: () => resolve(false)
            });
            encoder.configure(config);
            const frameData = new Uint8Array(width * height * 4);
            const frame = new VideoFrame(frameData, {
              format: "RGBA",
              codedWidth: width,
              codedHeight: height,
              timestamp: 0
            });
            encoder.encode(
              frame,
              quantizer !== null ? buildQuantizerEncodeOptions(codec, quantizer) : void 0
            );
            frame.close();
            await encoder.flush();
            resolve(true);
          } catch {
            resolve(false);
          }
        });
        if (success) {
          return true;
        }
      }
      return false;
    })();
    canEncodeVideoMemo.set(key, promise);
    return promise;
  };
  var canEncodeAudio = async (codec, options = {}) => {
    const {
      numberOfChannels = 2,
      sampleRate = 48e3,
      quality,
      // eslint-disable-next-line @typescript-eslint/no-deprecated
      bitrate,
      ...restOptions
    } = options;
    if (!AUDIO_CODECS.includes(codec)) {
      return false;
    }
    if (!Number.isInteger(numberOfChannels) || numberOfChannels <= 0) {
      throw new TypeError("numberOfChannels must be a positive integer.");
    }
    if (!Number.isInteger(sampleRate) || sampleRate <= 0) {
      throw new TypeError("sampleRate must be a positive integer.");
    }
    if (quality !== void 0 && !(quality instanceof Quality)) {
      throw new TypeError("quality, when provided, must be a Quality.");
    }
    if (quality !== void 0 && bitrate !== void 0) {
      throw new TypeError("quality and bitrate cannot both be provided.");
    }
    if (bitrate !== void 0 && !(bitrate instanceof Quality) && (!Number.isInteger(bitrate) || bitrate <= 0)) {
      throw new TypeError("bitrate must be a positive integer.");
    }
    validateAudioEncodingAdditionalOptions(codec, restOptions);
    const resolvedQuality = resolveQuality(quality, bitrate) ?? new Quality({ bitrate: 128e3 });
    const encoderConfig = buildAudioEncoderConfig({
      codec,
      numberOfChannels,
      sampleRate,
      quality: resolvedQuality,
      ...restOptions
    });
    const key = JSON.stringify(encoderConfig);
    const memoized = canEncodeAudioMemo.get(key);
    if (memoized) {
      return memoized;
    }
    const promise = (async () => {
      if (customAudioEncoders.some((x) => x.supports(codec, encoderConfig))) {
        return true;
      }
      if (PCM_AUDIO_CODECS.includes(codec)) {
        return true;
      }
      if (typeof AudioEncoder === "undefined") {
        return false;
      }
      try {
        const support = await AudioEncoder.isConfigSupported(encoderConfig);
        return support.supported === true;
      } catch {
        return false;
      }
    })();
    canEncodeAudioMemo.set(key, promise);
    return promise;
  };
  var resolveQuality = (quality, bitrate) => {
    if (quality !== void 0) {
      return quality;
    }
    if (bitrate === void 0) {
      return void 0;
    }
    return bitrate instanceof Quality ? bitrate : new Quality({ bitrate });
  };
  var canEncodeSubtitles = async (codec) => {
    if (!SUBTITLE_CODECS.includes(codec)) {
      return false;
    }
    return true;
  };
  var getEncodableCodecs = async () => {
    const [videoCodecs, audioCodecs, subtitleCodecs] = await Promise.all([
      getEncodableVideoCodecs(),
      getEncodableAudioCodecs(),
      getEncodableSubtitleCodecs()
    ]);
    return [...videoCodecs, ...audioCodecs, ...subtitleCodecs];
  };
  var getEncodableVideoCodecs = async (checkedCodecs = VIDEO_CODECS, options) => {
    const bools = await Promise.all(checkedCodecs.map((codec) => canEncodeVideo(codec, options)));
    return checkedCodecs.filter((_, i) => bools[i]);
  };
  var getEncodableAudioCodecs = async (checkedCodecs = AUDIO_CODECS, options) => {
    const bools = await Promise.all(checkedCodecs.map((codec) => canEncodeAudio(codec, options)));
    return checkedCodecs.filter((_, i) => bools[i]);
  };
  var getEncodableSubtitleCodecs = async (checkedCodecs = SUBTITLE_CODECS) => {
    const bools = await Promise.all(checkedCodecs.map(canEncodeSubtitles));
    return checkedCodecs.filter((_, i) => bools[i]);
  };
  var getFirstEncodableVideoCodec = async (checkedCodecs, options) => {
    for (const codec of checkedCodecs) {
      if (await canEncodeVideo(codec, options)) {
        return codec;
      }
    }
    return null;
  };
  var getFirstEncodableAudioCodec = async (checkedCodecs, options) => {
    for (const codec of checkedCodecs) {
      if (await canEncodeAudio(codec, options)) {
        return codec;
      }
    }
    return null;
  };
  var getFirstEncodableSubtitleCodec = async (checkedCodecs) => {
    for (const codec of checkedCodecs) {
      if (await canEncodeSubtitles(codec)) {
        return codec;
      }
    }
    return null;
  };

  // src/custom-coder.ts
  var CustomVideoDecoder = class {
    /** Returns true if and only if the decoder can decode the given codec configuration. */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    static supports(codec, config) {
      return false;
    }
  };
  var CustomAudioDecoder = class {
    /** Returns true if and only if the decoder can decode the given codec configuration. */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    static supports(codec, config) {
      return false;
    }
  };
  var CustomVideoEncoder = class {
    /** Returns true if and only if the encoder can encode the given codec configuration. */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    static supports(codec, config) {
      return false;
    }
  };
  var CustomAudioEncoder = class {
    /** Returns true if and only if the encoder can encode the given codec configuration. */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    static supports(codec, config) {
      return false;
    }
  };
  var customVideoDecoders = [];
  var customAudioDecoders = [];
  var customVideoEncoders = [];
  var customAudioEncoders = [];
  var registerDecoder = (decoder) => {
    if (decoder.prototype instanceof CustomVideoDecoder) {
      const casted = decoder;
      if (customVideoDecoders.includes(casted)) {
        Logging._warn("Video decoder already registered.");
        return;
      }
      customVideoDecoders.push(casted);
      canDecodeVideoMemo.clear();
    } else if (decoder.prototype instanceof CustomAudioDecoder) {
      const casted = decoder;
      if (customAudioDecoders.includes(casted)) {
        Logging._warn("Audio decoder already registered.");
        return;
      }
      customAudioDecoders.push(casted);
      canDecodeAudioMemo.clear();
    } else {
      throw new TypeError("Decoder must be a CustomVideoDecoder or CustomAudioDecoder.");
    }
  };
  var registerEncoder = (encoder) => {
    if (encoder.prototype instanceof CustomVideoEncoder) {
      const casted = encoder;
      if (customVideoEncoders.includes(casted)) {
        Logging._warn("Video encoder already registered.");
        return;
      }
      customVideoEncoders.push(casted);
      canEncodeVideoMemo.clear();
    } else if (encoder.prototype instanceof CustomAudioEncoder) {
      const casted = encoder;
      if (customAudioEncoders.includes(casted)) {
        Logging._warn("Audio encoder already registered.");
        return;
      }
      customAudioEncoders.push(casted);
      canEncodeAudioMemo.clear();
    } else {
      throw new TypeError("Encoder must be a CustomVideoEncoder or CustomAudioEncoder.");
    }
  };

  // src/pcm.ts
  var toUlaw = (s16) => {
    const MULAW_MAX = 8191;
    const MULAW_BIAS = 33;
    let number = s16;
    let mask = 4096;
    let sign = 0;
    let position = 12;
    let lsb = 0;
    if (number < 0) {
      number = -number;
      sign = 128;
    }
    number += MULAW_BIAS;
    if (number > MULAW_MAX) {
      number = MULAW_MAX;
    }
    while ((number & mask) !== mask && position >= 5) {
      mask >>= 1;
      position--;
    }
    lsb = number >> position - 4 & 15;
    return ~(sign | position - 5 << 4 | lsb) & 255;
  };
  var fromUlaw = (u82) => {
    const MULAW_BIAS = 33;
    let sign = 0;
    let position = 0;
    let number = ~u82;
    if (number & 128) {
      number &= ~(1 << 7);
      sign = -1;
    }
    position = ((number & 240) >> 4) + 5;
    const decoded = (1 << position | (number & 15) << position - 4 | 1 << position - 5) - MULAW_BIAS;
    return sign === 0 ? decoded : -decoded;
  };
  var toAlaw = (s16) => {
    const ALAW_MAX = 4095;
    let mask = 2048;
    let sign = 0;
    let position = 11;
    let lsb = 0;
    let number = s16;
    if (number < 0) {
      number = -number;
      sign = 128;
    }
    if (number > ALAW_MAX) {
      number = ALAW_MAX;
    }
    while ((number & mask) !== mask && position >= 5) {
      mask >>= 1;
      position--;
    }
    lsb = number >> (position === 4 ? 1 : position - 4) & 15;
    return (sign | position - 4 << 4 | lsb) ^ 85;
  };
  var fromAlaw = (u82) => {
    let sign = 0;
    let position = 0;
    let number = u82 ^ 85;
    if (number & 128) {
      number &= ~(1 << 7);
      sign = -1;
    }
    position = ((number & 240) >> 4) + 4;
    let decoded = 0;
    if (position !== 4) {
      decoded = 1 << position | (number & 15) << position - 4 | 1 << position - 5;
    } else {
      decoded = number << 1 | 1;
    }
    return sign === 0 ? decoded : -decoded;
  };

  // src/media-sink.ts
  var validatePacketRetrievalOptions = (options) => {
    if (!options || typeof options !== "object") {
      throw new TypeError("options must be an object.");
    }
    if (options.metadataOnly !== void 0 && typeof options.metadataOnly !== "boolean") {
      throw new TypeError("options.metadataOnly, when defined, must be a boolean.");
    }
    if (options.verifyKeyPackets !== void 0 && typeof options.verifyKeyPackets !== "boolean") {
      throw new TypeError("options.verifyKeyPackets, when defined, must be a boolean.");
    }
    if (options.verifyKeyPackets && options.metadataOnly) {
      throw new TypeError("options.verifyKeyPackets and options.metadataOnly cannot be enabled together.");
    }
    if (options.skipLiveWait !== void 0 && typeof options.skipLiveWait !== "boolean") {
      throw new TypeError("options.skipLiveWait, when defined, must be a boolean.");
    }
  };
  var validateTimestamp = (timestamp) => {
    if (!isNumber(timestamp)) {
      throw new TypeError("timestamp must be a number.");
    }
  };
  var maybeFixPacketType = (track, promise, options) => {
    if (options.verifyKeyPackets) {
      return promise.then(async (packet) => {
        if (!packet || packet.type === "delta") {
          return packet;
        }
        const determinedType = await track.determinePacketType(packet);
        if (determinedType) {
          packet.type = determinedType;
        }
        return packet;
      });
    } else {
      return promise;
    }
  };
  var EncodedPacketSink = class {
    /** Creates a new {@link EncodedPacketSink} for the given {@link InputTrack}. */
    constructor(track) {
      if (!(track instanceof InputTrack)) {
        throw new TypeError("track must be an InputTrack.");
      }
      this._track = track;
    }
    /**
     * Retrieves the track's first packet (in decode order), or null if it has no packets. The first packet is very
     * likely to be a key packet, but it doesn't have to be.
     */
    async getFirstPacket(options = {}) {
      validatePacketRetrievalOptions(options);
      if (this._track.input._disposed) {
        throw new InputDisposedError();
      }
      return maybeFixPacketType(this._track, this._track._backing.getFirstPacket(options), options);
    }
    /** Retrieves the track's first key packet (in decode order), or null if it has no key packets. */
    async getFirstKeyPacket(options = {}) {
      validatePacketRetrievalOptions(options);
      const firstPacket = await this.getFirstPacket(options);
      if (!firstPacket) {
        return null;
      }
      if (firstPacket.type === "key") {
        return firstPacket;
      }
      return this.getNextKeyPacket(firstPacket, options);
    }
    /**
     * Retrieves the packet corresponding to the given timestamp, in seconds. More specifically, returns the last packet
     * (in presentation order) with a start timestamp less than or equal to the given timestamp. This method can be
     * used to retrieve a track's last packet using `getPacket(Infinity)`. The method returns null if the timestamp
     * is before the first packet in the track.
     *
     * @param timestamp - The timestamp used for retrieval, in seconds.
     */
    async getPacket(timestamp, options = {}) {
      validateTimestamp(timestamp);
      validatePacketRetrievalOptions(options);
      if (this._track.input._disposed) {
        throw new InputDisposedError();
      }
      return maybeFixPacketType(this._track, this._track._backing.getPacket(timestamp, options), options);
    }
    /**
     * Retrieves the packet following the given packet (in decode order), or null if the given packet is the
     * last packet.
     */
    async getNextPacket(packet, options = {}) {
      if (!(packet instanceof EncodedPacket)) {
        throw new TypeError("packet must be an EncodedPacket.");
      }
      validatePacketRetrievalOptions(options);
      if (this._track.input._disposed) {
        throw new InputDisposedError();
      }
      return maybeFixPacketType(this._track, this._track._backing.getNextPacket(packet, options), options);
    }
    /**
     * Retrieves the key packet corresponding to the given timestamp, in seconds. More specifically, returns the last
     * key packet (in presentation order) with a start timestamp less than or equal to the given timestamp. A key packet
     * is a packet that doesn't require previous packets to be decoded. This method can be used to retrieve a track's
     * last key packet using `getKeyPacket(Infinity)`. The method returns null if the timestamp is before the first
     * key packet in the track.
     *
     * To ensure that the returned packet is guaranteed to be a real key frame, enable `options.verifyKeyPackets`.
     *
     * @param timestamp - The timestamp used for retrieval, in seconds.
     */
    async getKeyPacket(timestamp, options = {}) {
      validateTimestamp(timestamp);
      validatePacketRetrievalOptions(options);
      if (this._track.input._disposed) {
        throw new InputDisposedError();
      }
      if (!options.verifyKeyPackets) {
        return this._track._backing.getKeyPacket(timestamp, options);
      }
      const packet = await this._track._backing.getKeyPacket(timestamp, options);
      if (!packet) {
        return packet;
      }
      assert(packet.type === "key");
      const determinedType = await this._track.determinePacketType(packet);
      if (determinedType === "delta") {
        return this.getKeyPacket(packet.timestamp - 1 / await this._track.getTimeResolution(), options);
      }
      return packet;
    }
    /**
     * Retrieves the key packet following the given packet (in decode order), or null if the given packet is the last
     * key packet.
     *
     * To ensure that the returned packet is guaranteed to be a real key frame, enable `options.verifyKeyPackets`.
     */
    async getNextKeyPacket(packet, options = {}) {
      if (!(packet instanceof EncodedPacket)) {
        throw new TypeError("packet must be an EncodedPacket.");
      }
      validatePacketRetrievalOptions(options);
      if (this._track.input._disposed) {
        throw new InputDisposedError();
      }
      if (!options.verifyKeyPackets) {
        return this._track._backing.getNextKeyPacket(packet, options);
      }
      const nextPacket = await this._track._backing.getNextKeyPacket(packet, options);
      if (!nextPacket) {
        return nextPacket;
      }
      assert(nextPacket.type === "key");
      const determinedType = await this._track.determinePacketType(nextPacket);
      if (determinedType === "delta") {
        return this.getNextKeyPacket(nextPacket, options);
      }
      return nextPacket;
    }
    /**
     * Creates an async iterator that yields the packets in this track in decode order. To enable fast iteration, this
     * method will intelligently preload packets based on the speed of the consumer.
     *
     * @param startPacket - (optional) The packet from which iteration should begin. This packet will also be yielded.
     * @param endPacket - (optional) The packet at which iteration should end. This packet will _not_ be yielded.
     */
    packets(startPacket, endPacket, options = {}) {
      if (startPacket !== void 0 && !(startPacket instanceof EncodedPacket)) {
        throw new TypeError("startPacket must be an EncodedPacket.");
      }
      if (startPacket !== void 0 && startPacket.isMetadataOnly && !options?.metadataOnly) {
        throw new TypeError("startPacket can only be metadata-only if options.metadataOnly is enabled.");
      }
      if (endPacket !== void 0 && !(endPacket instanceof EncodedPacket)) {
        throw new TypeError("endPacket must be an EncodedPacket.");
      }
      validatePacketRetrievalOptions(options);
      if (this._track.input._disposed) {
        throw new InputDisposedError();
      }
      const packetQueue = [];
      let { promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers();
      let { promise: queueDequeue, resolve: onQueueDequeue } = promiseWithResolvers();
      let ended = false;
      let terminated = false;
      let outOfBandError = null;
      let hasOutOfBandError = false;
      const timestamps = [];
      const maxQueueSize = () => Math.max(2, timestamps.length);
      (async () => {
        let packet = startPacket ?? await this.getFirstPacket(options);
        while (packet && !terminated && !this._track.input._disposed) {
          if (endPacket && packet.sequenceNumber >= endPacket?.sequenceNumber) {
            break;
          }
          if (packetQueue.length > maxQueueSize()) {
            ({ promise: queueDequeue, resolve: onQueueDequeue } = promiseWithResolvers());
            await queueDequeue;
            continue;
          }
          packetQueue.push(packet);
          onQueueNotEmpty();
          ({ promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers());
          packet = await this.getNextPacket(packet, options);
        }
        ended = true;
        onQueueNotEmpty();
      })().catch((error) => {
        if (!hasOutOfBandError) {
          outOfBandError = error;
          hasOutOfBandError = true;
          onQueueNotEmpty();
        }
      });
      const track = this._track;
      return {
        async next() {
          while (true) {
            if (track.input._disposed) {
              throw new InputDisposedError();
            } else if (terminated) {
              return { value: void 0, done: true };
            } else if (hasOutOfBandError) {
              throw outOfBandError;
            } else if (packetQueue.length > 0) {
              const value = packetQueue.shift();
              const now = performance.now();
              timestamps.push(now);
              while (timestamps.length > 0 && now - timestamps[0] >= 1e3) {
                timestamps.shift();
              }
              onQueueDequeue();
              return { value, done: false };
            } else if (ended) {
              return { value: void 0, done: true };
            } else {
              await queueNotEmpty;
            }
          }
        },
        async return() {
          terminated = true;
          onQueueDequeue();
          onQueueNotEmpty();
          return { value: void 0, done: true };
        },
        async throw(error) {
          throw error;
        },
        [Symbol.asyncIterator]() {
          return this;
        }
      };
    }
  };
  var DecoderWrapper = class {
    constructor(onSample, onError) {
      this.onSample = onSample;
      this.onError = onError;
    }
  };
  var BaseMediaSampleSink = class {
    /** @internal */
    mediaSamplesInRange(startTimestamp = -Infinity, endTimestamp = Infinity, options) {
      validateTimestamp(startTimestamp);
      validateTimestamp(endTimestamp);
      const sampleQueue = [];
      let firstSampleQueued = false;
      let lastSample = null;
      let { promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers();
      let { promise: queueDequeue, resolve: onQueueDequeue } = promiseWithResolvers();
      let decoderIsFlushed = false;
      let ended = false;
      let terminated = false;
      let decoder = null;
      let outOfBandError = null;
      let hasOutOfBandError = false;
      const packetRetrievalOptions = {
        ...options,
        verifyKeyPackets: true,
        metadataOnly: false
      };
      (async () => {
        decoder = await this._createDecoder((sample) => {
          onQueueDequeue();
          if (sample.timestamp >= endTimestamp) {
            ended = true;
          }
          if (ended) {
            sample.close();
            return;
          }
          if (lastSample) {
            if (sample.timestamp > startTimestamp) {
              sampleQueue.push(lastSample);
              firstSampleQueued = true;
            } else {
              lastSample.close();
            }
          }
          if (sample.timestamp >= startTimestamp) {
            sampleQueue.push(sample);
            firstSampleQueued = true;
          }
          lastSample = firstSampleQueued ? null : sample;
          if (sampleQueue.length > 0) {
            onQueueNotEmpty();
            ({ promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers());
          }
        }, (error) => {
          if (!hasOutOfBandError) {
            outOfBandError = error;
            hasOutOfBandError = true;
            onQueueNotEmpty();
          }
        });
        const packetSink = this._createPacketSink();
        const keyPacket = await packetSink.getKeyPacket(startTimestamp, packetRetrievalOptions) ?? await packetSink.getFirstKeyPacket(packetRetrievalOptions);
        let currentPacket = keyPacket;
        const endPacket = void 0;
        const packets = packetSink.packets(keyPacket ?? void 0, endPacket, packetRetrievalOptions);
        await packets.next();
        while (currentPacket && !ended && !this._track.input._disposed) {
          const maxQueueSize = computeMaxQueueSize(sampleQueue.length);
          if (sampleQueue.length + decoder.getDecodeQueueSize() > maxQueueSize) {
            ({ promise: queueDequeue, resolve: onQueueDequeue } = promiseWithResolvers());
            await queueDequeue;
            continue;
          }
          decoder.decode(currentPacket);
          const packetResult = await packets.next();
          if (packetResult.done) {
            break;
          }
          currentPacket = packetResult.value;
        }
        await packets.return();
        if (!terminated && !this._track.input._disposed) {
          await decoder.flush();
        }
        if (!firstSampleQueued && lastSample) {
          sampleQueue.push(lastSample);
        }
        decoderIsFlushed = true;
        onQueueNotEmpty();
      })().catch((error) => {
        if (!hasOutOfBandError) {
          outOfBandError = error;
          hasOutOfBandError = true;
          onQueueNotEmpty();
        }
      }).finally(() => {
        decoder?.close();
      });
      const track = this._track;
      const closeSamples = () => {
        lastSample?.close();
        for (const sample of sampleQueue) {
          sample.close();
        }
      };
      return {
        async next() {
          while (true) {
            if (track.input._disposed) {
              closeSamples();
              throw new InputDisposedError();
            } else if (terminated) {
              return { value: void 0, done: true };
            } else if (hasOutOfBandError) {
              closeSamples();
              throw outOfBandError;
            } else if (sampleQueue.length > 0) {
              const value = sampleQueue.shift();
              onQueueDequeue();
              return { value, done: false };
            } else if (!decoderIsFlushed) {
              await queueNotEmpty;
            } else {
              return { value: void 0, done: true };
            }
          }
        },
        async return() {
          terminated = true;
          ended = true;
          onQueueDequeue();
          onQueueNotEmpty();
          closeSamples();
          return { value: void 0, done: true };
        },
        async throw(error) {
          throw error;
        },
        [Symbol.asyncIterator]() {
          return this;
        }
      };
    }
    /** @internal */
    mediaSamplesAtTimestamps(timestamps, options) {
      validateAnyIterable(timestamps);
      const timestampIterator = toAsyncIterator(timestamps);
      const timestampsOfInterest = [];
      const sampleQueue = [];
      let { promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers();
      let { promise: queueDequeue, resolve: onQueueDequeue } = promiseWithResolvers();
      let decoderIsFlushed = false;
      let terminated = false;
      let decoder = null;
      let outOfBandError = null;
      let hasOutOfBandError = false;
      const pushToQueue = (sample) => {
        sampleQueue.push(sample);
        onQueueNotEmpty();
        ({ promise: queueNotEmpty, resolve: onQueueNotEmpty } = promiseWithResolvers());
      };
      const retrievalOptions = {
        ...options,
        verifyKeyPackets: true,
        metadataOnly: false
      };
      (async () => {
        decoder = await this._createDecoder((sample) => {
          onQueueDequeue();
          if (terminated) {
            sample.close();
            return;
          }
          let sampleUses = 0;
          while (timestampsOfInterest.length > 0 && sample.timestamp - timestampsOfInterest[0] > -1e-10) {
            sampleUses++;
            timestampsOfInterest.shift();
          }
          if (sampleUses > 0) {
            for (let i = 0; i < sampleUses; i++) {
              pushToQueue(i < sampleUses - 1 ? sample.clone() : sample);
            }
          } else {
            sample.close();
          }
        }, (error) => {
          if (!hasOutOfBandError) {
            outOfBandError = error;
            hasOutOfBandError = true;
            onQueueNotEmpty();
          }
        });
        const packetSink = this._createPacketSink();
        let lastPacket = null;
        let lastKeyPacket = null;
        let maxSequenceNumber = -1;
        const decodePackets = async () => {
          assert(lastKeyPacket);
          assert(decoder);
          let currentPacket = lastKeyPacket;
          decoder.decode(currentPacket);
          while (currentPacket.sequenceNumber < maxSequenceNumber) {
            const maxQueueSize = computeMaxQueueSize(sampleQueue.length);
            while (sampleQueue.length + decoder.getDecodeQueueSize() > maxQueueSize && !terminated) {
              ({ promise: queueDequeue, resolve: onQueueDequeue } = promiseWithResolvers());
              await queueDequeue;
            }
            if (terminated) {
              break;
            }
            const nextPacket = await packetSink.getNextPacket(currentPacket, retrievalOptions);
            assert(nextPacket);
            decoder.decode(nextPacket);
            currentPacket = nextPacket;
          }
          maxSequenceNumber = -1;
        };
        const flushDecoder = async () => {
          assert(decoder);
          await decoder.flush();
          for (let i = 0; i < timestampsOfInterest.length; i++) {
            pushToQueue(null);
          }
          timestampsOfInterest.length = 0;
        };
        for await (const timestamp of timestampIterator) {
          validateTimestamp(timestamp);
          if (terminated || this._track.input._disposed) {
            break;
          }
          const targetPacket = await packetSink.getPacket(timestamp, retrievalOptions);
          const keyPacket = targetPacket && await packetSink.getKeyPacket(timestamp, retrievalOptions);
          if (!keyPacket) {
            if (maxSequenceNumber !== -1) {
              await decodePackets();
              await flushDecoder();
            }
            pushToQueue(null);
            lastPacket = null;
            continue;
          }
          if (lastPacket && (keyPacket.sequenceNumber !== lastKeyPacket.sequenceNumber || targetPacket.timestamp < lastPacket.timestamp)) {
            await decodePackets();
            await flushDecoder();
          }
          timestampsOfInterest.push(targetPacket.timestamp);
          maxSequenceNumber = Math.max(targetPacket.sequenceNumber, maxSequenceNumber);
          lastPacket = targetPacket;
          lastKeyPacket = keyPacket;
        }
        if (!terminated && !this._track.input._disposed) {
          if (maxSequenceNumber !== -1) {
            await decodePackets();
          }
          await flushDecoder();
        }
        decoderIsFlushed = true;
        onQueueNotEmpty();
      })().catch((error) => {
        if (!hasOutOfBandError) {
          outOfBandError = error;
          hasOutOfBandError = true;
          onQueueNotEmpty();
        }
      }).finally(() => {
        decoder?.close();
      });
      const track = this._track;
      const closeSamples = () => {
        for (const sample of sampleQueue) {
          sample?.close();
        }
      };
      return {
        async next() {
          while (true) {
            if (track.input._disposed) {
              closeSamples();
              throw new InputDisposedError();
            } else if (terminated) {
              return { value: void 0, done: true };
            } else if (hasOutOfBandError) {
              closeSamples();
              throw outOfBandError;
            } else if (sampleQueue.length > 0) {
              const value = sampleQueue.shift();
              assert(value !== void 0);
              onQueueDequeue();
              return { value, done: false };
            } else if (!decoderIsFlushed) {
              await queueNotEmpty;
            } else {
              return { value: void 0, done: true };
            }
          }
        },
        async return() {
          terminated = true;
          onQueueDequeue();
          onQueueNotEmpty();
          closeSamples();
          return { value: void 0, done: true };
        },
        async throw(error) {
          throw error;
        },
        [Symbol.asyncIterator]() {
          return this;
        }
      };
    }
  };
  var computeMaxQueueSize = (decodedSampleQueueSize) => {
    return decodedSampleQueueSize === 0 ? 40 : 8;
  };
  var VideoDecoderWrapper = class extends DecoderWrapper {
    constructor(onSample, onError, codec, decoderConfig, rotation, timeResolution) {
      super(onSample, onError);
      this.codec = codec;
      this.decoderConfig = decoderConfig;
      this.rotation = rotation;
      this.timeResolution = timeResolution;
      this.decoder = null;
      this.customDecoder = null;
      this.customDecoderCallSerializer = new CallSerializer();
      this.customDecoderQueueSize = 0;
      this.inputTimestamps = [];
      // Timestamps input into the decoder, sorted.
      this.sampleQueue = [];
      // Safari-specific thing, check usage.
      this.currentPacketIndex = 0;
      this.raslSkipped = false;
      // For HEVC stuff
      // Alpha stuff
      this.alphaDecoder = null;
      this.alphaHadKeyframe = false;
      this.colorQueue = [];
      this.alphaQueue = [];
      this.merger = null;
      this.decodedAlphaChunkCount = 0;
      this.alphaDecoderQueueSize = 0;
      /** Each value is the number of decoded alpha chunks at which a null alpha frame should be added. */
      this.nullAlphaFrameQueue = [];
      this.currentAlphaPacketIndex = 0;
      this.alphaRaslSkipped = false;
      // For HEVC stuff
      this.finalSamples = [];
      this.mergeAlphaPromises = [];
      const MatchingCustomDecoder = customVideoDecoders.find((x) => x.supports(codec, decoderConfig));
      if (MatchingCustomDecoder) {
        this.customDecoder = new MatchingCustomDecoder();
        this.customDecoder.codec = codec;
        this.customDecoder.config = decoderConfig;
        this.customDecoder.onSample = (sample) => {
          if (!(sample instanceof VideoSample)) {
            throw new TypeError("The argument passed to onSample must be a VideoSample.");
          }
          this.finalizeAndEmitSample(sample);
        };
        this.customDecoder.onError = (error) => {
          onError(error);
        };
        void this.customDecoderCallSerializer.call(() => this.customDecoder.init()).catch((error) => onError(error));
      } else {
        const colorHandler = (frame) => {
          if (this.alphaQueue.length > 0) {
            const alphaFrame = this.alphaQueue.shift();
            assert(alphaFrame !== void 0);
            void this.mergeAlpha(frame, alphaFrame);
          } else {
            this.colorQueue.push(frame);
          }
        };
        if (codec === "avc" && this.decoderConfig.description && isChromium()) {
          const record = deserializeAvcDecoderConfigurationRecord(toUint8Array(this.decoderConfig.description));
          if (record && record.sequenceParameterSets.length > 0) {
            const sps = parseAvcSps(record.sequenceParameterSets[0]);
            if (sps && sps.frameMbsOnlyFlag === 0) {
              this.decoderConfig = {
                ...this.decoderConfig,
                hardwareAcceleration: "prefer-software"
              };
            }
          }
        }
        const stack = new Error("Decoding error").stack;
        this.decoder = new VideoDecoder({
          output: (frame) => {
            try {
              colorHandler(frame);
            } catch (error) {
              this.onError(error);
            }
          },
          error: (error) => {
            error.stack = stack;
            this.onError(error);
          }
        });
        this.decoder.configure(this.decoderConfig);
      }
    }
    getDecodeQueueSize() {
      if (this.customDecoder) {
        return this.customDecoderQueueSize;
      } else {
        assert(this.decoder);
        return Math.max(
          this.decoder.decodeQueueSize,
          this.alphaDecoder?.decodeQueueSize ?? 0
        );
      }
    }
    decode(packet) {
      if (this.codec === "hevc" && this.currentPacketIndex > 0 && !this.raslSkipped) {
        if (this.hasHevcRaslPicture(packet.data)) {
          return;
        }
        this.raslSkipped = true;
      }
      if (this.customDecoder) {
        this.customDecoderQueueSize++;
        void this.customDecoderCallSerializer.call(() => this.customDecoder.decode(packet)).catch((error) => this.onError(error)).finally(() => this.customDecoderQueueSize--);
      } else {
        assert(this.decoder);
        if (!isWebKit()) {
          insertSorted(this.inputTimestamps, packet.timestamp, (x) => x);
        }
        if (isChromium() && this.currentPacketIndex === 0) {
          if (this.codec === "avc") {
            const filteredNalUnits = [];
            let hasFrameData = false;
            for (const loc of iterateAvcNalUnits(packet.data, this.decoderConfig)) {
              const type = extractNalUnitTypeForAvc(packet.data[loc.offset]);
              hasFrameData ||= type >= 1 && type <= 5;
              if (type === 9 /* AUD */) {
                if (hasFrameData) {
                  break;
                } else {
                  filteredNalUnits.length = 0;
                }
              }
              if (!(type >= 20 && type <= 31)) {
                filteredNalUnits.push(packet.data.subarray(loc.offset, loc.offset + loc.length));
              }
            }
            const newData = concatAvcNalUnits(filteredNalUnits, this.decoderConfig);
            packet = new EncodedPacket(newData, packet.type, packet.timestamp, packet.duration);
          } else if (this.codec === "hevc") {
            const sanitizedData = sanitizeHevcPacketForChromium(packet.data, this.decoderConfig);
            if (sanitizedData) {
              packet = new EncodedPacket(sanitizedData, packet.type, packet.timestamp, packet.duration);
            }
          }
        }
        this.decoder.decode(packet.toEncodedVideoChunk());
        this.decodeAlphaData(packet);
      }
      this.currentPacketIndex++;
    }
    decodeAlphaData(packet) {
      if (!packet.sideData.alpha) {
        this.pushNullAlphaFrame();
        return;
      }
      if (!this.merger) {
        this.merger = new ColorAlphaMerger();
      }
      if (!this.alphaDecoder) {
        const alphaHandler = (frame) => {
          if (this.colorQueue.length > 0) {
            const colorFrame = this.colorQueue.shift();
            assert(colorFrame !== void 0);
            void this.mergeAlpha(colorFrame, frame);
          } else {
            this.alphaQueue.push(frame);
          }
          this.decodedAlphaChunkCount++;
          while (this.nullAlphaFrameQueue.length > 0 && this.nullAlphaFrameQueue[0] === this.decodedAlphaChunkCount) {
            this.nullAlphaFrameQueue.shift();
            if (this.colorQueue.length > 0) {
              const colorFrame = this.colorQueue.shift();
              assert(colorFrame !== void 0);
              void this.mergeAlpha(colorFrame, null);
            } else {
              this.alphaQueue.push(null);
            }
          }
          this.alphaDecoderQueueSize--;
        };
        const stack = new Error("Decoding error").stack;
        this.alphaDecoder = new VideoDecoder({
          output: (frame) => {
            try {
              alphaHandler(frame);
            } catch (error) {
              this.onError(error);
            }
          },
          error: (error) => {
            error.stack = stack;
            this.onError(error);
          }
        });
        this.alphaDecoder.configure(this.decoderConfig);
      }
      const type = determineVideoPacketType(this.codec, this.decoderConfig, packet.sideData.alpha);
      if (!this.alphaHadKeyframe) {
        this.alphaHadKeyframe = type === "key";
      }
      if (this.alphaHadKeyframe) {
        if (this.codec === "hevc" && this.currentAlphaPacketIndex > 0 && !this.alphaRaslSkipped) {
          if (this.hasHevcRaslPicture(packet.sideData.alpha)) {
            this.pushNullAlphaFrame();
            return;
          }
          this.alphaRaslSkipped = true;
        }
        this.currentAlphaPacketIndex++;
        this.alphaDecoder.decode(packet.alphaToEncodedVideoChunk(type ?? packet.type));
        this.alphaDecoderQueueSize++;
      } else {
        this.pushNullAlphaFrame();
      }
    }
    pushNullAlphaFrame() {
      if (this.alphaDecoderQueueSize === 0) {
        this.alphaQueue.push(null);
      } else {
        this.nullAlphaFrameQueue.push(this.decodedAlphaChunkCount + this.alphaDecoderQueueSize);
      }
    }
    /**
     * If we're using HEVC, we need to make sure to skip any RASL slices that follow a non-IDR key frame such as
     * CRA_NUT. This is because RASL slices cannot be decoded without data before the CRA_NUT. Browsers behave
     * differently here: Chromium drops the packets, Safari throws a decoder error. Either way, it's not good
     * and causes bugs upstream. So, let's take the dropping into our own hands.
     */
    hasHevcRaslPicture(packetData) {
      for (const loc of iterateHevcNalUnits(packetData, this.decoderConfig)) {
        const type = extractNalUnitTypeForHevc(packetData[loc.offset]);
        if (type === 8 /* RASL_N */ || type === 9 /* RASL_R */) {
          return true;
        }
      }
      return false;
    }
    /** Handler for the WebCodecs VideoDecoder for ironing out browser differences. */
    sampleHandler(sample) {
      if (isWebKit()) {
        if (this.sampleQueue.length > 0 && sample.timestamp >= last(this.sampleQueue).timestamp) {
          for (const sample2 of this.sampleQueue) {
            this.finalizeAndEmitSample(sample2);
          }
          this.sampleQueue.length = 0;
        }
        insertSorted(this.sampleQueue, sample, (x) => x.timestamp);
      } else {
        const timestamp = this.inputTimestamps.shift();
        assert(timestamp !== void 0);
        sample.setTimestamp(timestamp);
        this.finalizeAndEmitSample(sample);
      }
    }
    finalizeAndEmitSample(sample) {
      sample.setTimestamp(Math.round(sample.timestamp * this.timeResolution) / this.timeResolution);
      sample.setDuration(Math.round(sample.duration * this.timeResolution) / this.timeResolution);
      sample.setRotation(this.rotation);
      this.onSample(sample);
    }
    async mergeAlpha(color, alpha) {
      const resolver = promiseWithResolvers();
      this.mergeAlphaPromises.push(resolver.promise);
      const result = { sample: null };
      this.finalSamples.push(result);
      try {
        if (!alpha) {
          result.sample = new VideoSample(color);
        } else {
          assert(this.merger);
          const finalFrame = await this.merger.merge(color, alpha);
          result.sample = new VideoSample(finalFrame);
        }
        while (this.finalSamples.length > 0 && this.finalSamples[0].sample !== null) {
          const next = this.finalSamples.shift();
          this.sampleHandler(next.sample);
        }
      } catch (error) {
        removeItem(this.finalSamples, result);
        this.onError(error);
      } finally {
        removeItem(this.mergeAlphaPromises, resolver.promise);
        resolver.resolve();
      }
    }
    async flush() {
      if (this.customDecoder) {
        await this.customDecoderCallSerializer.call(() => this.customDecoder.flush());
      } else {
        assert(this.decoder);
        await Promise.all([
          this.decoder.flush(),
          this.alphaDecoder?.flush()
        ]);
        await Promise.all(this.mergeAlphaPromises);
        this.colorQueue.forEach((x) => x.close());
        this.colorQueue.length = 0;
        this.alphaQueue.forEach((x) => x?.close());
        this.alphaQueue.length = 0;
        this.alphaHadKeyframe = false;
        this.decodedAlphaChunkCount = 0;
        this.alphaDecoderQueueSize = 0;
        this.nullAlphaFrameQueue.length = 0;
        this.currentAlphaPacketIndex = 0;
        this.alphaRaslSkipped = false;
      }
      if (isWebKit()) {
        for (const sample of this.sampleQueue) {
          this.finalizeAndEmitSample(sample);
        }
        this.sampleQueue.length = 0;
      }
      this.currentPacketIndex = 0;
      this.raslSkipped = false;
    }
    close() {
      if (this.customDecoder) {
        void this.customDecoderCallSerializer.call(() => this.customDecoder.close());
      } else {
        assert(this.decoder);
        this.decoder.close();
        this.alphaDecoder?.close();
        this.colorQueue.forEach((x) => x.close());
        this.colorQueue.length = 0;
        this.alphaQueue.forEach((x) => x?.close());
        this.alphaQueue.length = 0;
        this.merger?.close();
      }
      for (const sample of this.sampleQueue) {
        sample.close();
      }
      this.sampleQueue.length = 0;
    }
  };
  var mergerWorkerUrl = null;
  var ColorAlphaMerger = class {
    constructor() {
      this.workers = [];
      this.nextWorkerIndex = 0;
      this.pendingRequests = /* @__PURE__ */ new Map();
      this.nextRequestId = 0;
    }
    merge(color, alpha) {
      if (this.workers.length === 0) {
        if (!mergerWorkerUrl) {
          const blob = new Blob(
            [`(${colorAlphaMergerWorkerCode.toString()})()`],
            { type: "application/javascript" }
          );
          mergerWorkerUrl = URL.createObjectURL(blob);
        }
        const poolSize = clamp(navigator.hardwareConcurrency, 1, 4);
        for (let i = 0; i < poolSize; i++) {
          const worker2 = new Worker(mergerWorkerUrl);
          worker2.addEventListener("message", (event) => {
            const data = event.data;
            const pending2 = this.pendingRequests.get(data.id);
            if (!pending2) {
              return;
            }
            this.pendingRequests.delete(data.id);
            if ("error" in data) {
              pending2.reject(new Error(data.error));
            } else {
              pending2.resolve(data.frame);
            }
          });
          worker2.addEventListener("error", (event) => {
            const error = new Error(event.message || "Color/alpha merge worker error.");
            for (const pending2 of this.pendingRequests.values()) {
              pending2.reject(error);
            }
            this.pendingRequests.clear();
          });
          this.workers.push(worker2);
        }
      }
      const id = this.nextRequestId++;
      const pending = promiseWithResolvers();
      this.pendingRequests.set(id, pending);
      const worker = this.workers[this.nextWorkerIndex];
      this.nextWorkerIndex = (this.nextWorkerIndex + 1) % this.workers.length;
      worker.postMessage({ id, color, alpha }, { transfer: [color, alpha] });
      return pending.promise;
    }
    close() {
      for (const worker of this.workers) {
        worker.terminate();
      }
      this.workers.length = 0;
      const error = new Error("Color/alpha merger closed.");
      for (const pending of this.pendingRequests.values()) {
        pending.reject(error);
      }
      this.pendingRequests.clear();
    }
  };
  var colorAlphaMergerWorkerCode = () => {
    let cpuAlphaBuffer = null;
    let cpuColorBuffer = null;
    let chain = Promise.resolve();
    self.addEventListener("message", (event) => {
      const { id, color, alpha } = event.data;
      chain = chain.then(async () => {
        try {
          const frame = await merge(color, alpha);
          self.postMessage({ id, frame }, { transfer: [frame] });
        } catch (error) {
          self.postMessage({ id, error: error.message });
        } finally {
          color.close();
          alpha.close();
        }
      });
    });
    const merge = async (color, alpha) => {
      const format = color.format;
      const alphaFormat = alpha.format;
      if (!format || !alphaFormat) {
        throw new Error("CPU color/alpha merging requires a known VideoFrame format.");
      }
      const colorIs10 = format.includes("P10");
      const colorIs12 = format.includes("P12");
      const alphaIs10 = alphaFormat.includes("P10");
      const alphaIs12 = alphaFormat.includes("P12");
      if (alphaIs10 !== colorIs10 || alphaIs12 !== colorIs12) {
        throw new Error(
          `CPU color/alpha merging requires the alpha frame to have the same bit depth as the color frame (color: '${format}', alpha: '${alphaFormat}').`
        );
      }
      if (format === "RGBX" || format === "RGBA" || format === "BGRX" || format === "BGRA") {
        return await mergeInterleavedRgba(color, alpha, format);
      } else if (format === "I420" || format === "I420P10" || format === "I420P12" || format === "I422" || format === "I422P10" || format === "I422P12" || format === "I444" || format === "I444P10" || format === "I444P12") {
        return await mergePlanarYuv(color, alpha, format);
      } else if (format === "NV12") {
        return await mergeNv12(color, alpha);
      }
      throw new Error(`CPU color/alpha merging does not support format '${format}'.`);
    };
    const mergeInterleavedRgba = async (color, alpha, format) => {
      const width = color.visibleRect?.width ?? color.codedWidth;
      const height = color.visibleRect?.height ?? color.codedHeight;
      const pixelCount = width * height;
      const output = new Uint8Array(pixelCount * 4);
      await color.copyTo(output);
      const alphaY = await readAlpha(alpha, width, height, 1);
      for (let i = 0, j = 3; i < pixelCount; i++, j += 4) {
        output[j] = alphaY[i];
      }
      const outputFormat = format === "RGBX" || format === "RGBA" ? "RGBA" : "BGRA";
      const init = {
        format: outputFormat,
        codedWidth: width,
        codedHeight: height,
        timestamp: color.timestamp,
        duration: color.duration ?? void 0,
        transfer: [output.buffer]
      };
      return new VideoFrame(output, init);
    };
    const mergePlanarYuv = async (color, alpha, format) => {
      const width = color.visibleRect?.width ?? color.codedWidth;
      const height = color.visibleRect?.height ?? color.codedHeight;
      const is10 = format.includes("P10");
      const is12 = format.includes("P12");
      const bytesPerSample = is10 || is12 ? 2 : 1;
      let chromaW;
      let chromaH;
      if (format.startsWith("I420")) {
        chromaW = Math.ceil(width / 2);
        chromaH = Math.ceil(height / 2);
      } else if (format.startsWith("I422")) {
        chromaW = Math.ceil(width / 2);
        chromaH = height;
      } else {
        chromaW = width;
        chromaH = height;
      }
      const ySamples = width * height;
      const uvSamples = chromaW * chromaH;
      const yBytes = ySamples * bytesPerSample;
      const uvBytes = uvSamples * bytesPerSample;
      const aBytes = ySamples * bytesPerSample;
      const outputBytes = yBytes + 2 * uvBytes + aBytes;
      const output = new Uint8Array(outputBytes);
      await color.copyTo(output);
      const alphaY = await readAlpha(alpha, width, height, bytesPerSample);
      const aOffset = yBytes + 2 * uvBytes;
      output.set(alphaY, aOffset);
      const outputFormat = format.slice(0, 4) + "A" + format.slice(4);
      const init = {
        format: outputFormat,
        codedWidth: width,
        codedHeight: height,
        timestamp: color.timestamp,
        duration: color.duration ?? void 0,
        transfer: [output.buffer]
      };
      return new VideoFrame(output, init);
    };
    const mergeNv12 = async (color, alpha) => {
      const width = color.visibleRect?.width ?? color.codedWidth;
      const height = color.visibleRect?.height ?? color.codedHeight;
      const ySize = width * height;
      const chromaW = Math.ceil(width / 2);
      const chromaH = Math.ceil(height / 2);
      const uvSize = chromaW * chromaH;
      const sourceSize = color.allocationSize();
      if (!cpuColorBuffer || cpuColorBuffer.byteLength !== sourceSize) {
        cpuColorBuffer = new Uint8Array(sourceSize);
      }
      await color.copyTo(cpuColorBuffer);
      const output = new Uint8Array(ySize + 2 * uvSize + ySize);
      output.set(cpuColorBuffer.subarray(0, ySize), 0);
      const uOffset = ySize;
      const vOffset = ySize + uvSize;
      const uvStart = ySize;
      for (let i = 0; i < uvSize; i++) {
        output[uOffset + i] = cpuColorBuffer[uvStart + i * 2];
        output[vOffset + i] = cpuColorBuffer[uvStart + i * 2 + 1];
      }
      const alphaY = await readAlpha(alpha, width, height, 1);
      output.set(alphaY, ySize + 2 * uvSize);
      const init = {
        format: "I420A",
        codedWidth: width,
        codedHeight: height,
        timestamp: color.timestamp,
        duration: color.duration ?? void 0,
        transfer: [output.buffer]
      };
      return new VideoFrame(output, init);
    };
    const readAlpha = async (alpha, width, height, bytesPerSample) => {
      const size = alpha.allocationSize();
      if (!cpuAlphaBuffer || cpuAlphaBuffer.byteLength !== size) {
        cpuAlphaBuffer = new Uint8Array(size);
      }
      await alpha.copyTo(cpuAlphaBuffer);
      const format = alpha.format;
      if (format === "RGBA" || format === "BGRA" || format === "RGBX" || format === "BGRX") {
        const rOffset = format === "RGBA" || format === "RGBX" ? 0 : 2;
        const pixelCount = width * height;
        for (let i = 0; i < pixelCount; i++) {
          cpuAlphaBuffer[i] = cpuAlphaBuffer[i * 4 + rOffset];
        }
        return cpuAlphaBuffer.subarray(0, pixelCount);
      } else {
        return cpuAlphaBuffer.subarray(0, width * height * bytesPerSample);
      }
    };
  };
  var validateVideoSinkDecoderOptions = (decoderOptions) => {
    if (!decoderOptions || typeof decoderOptions !== "object") {
      throw new TypeError("decoderOptions must be an object.");
    }
    if (decoderOptions.hardwareAcceleration !== void 0 && !["no-preference", "prefer-hardware", "prefer-software"].includes(decoderOptions.hardwareAcceleration)) {
      throw new TypeError(
        "decoderOptions.hardwareAcceleration, when provided, must be 'no-preference', 'prefer-hardware' or 'prefer-software'."
      );
    }
    if (decoderOptions.optimizeForLatency !== void 0 && typeof decoderOptions.optimizeForLatency !== "boolean") {
      throw new TypeError("decoderOptions.optimizeForLatency, when provided, must be a boolean.");
    }
  };
  var VideoSampleSink = class extends BaseMediaSampleSink {
    /** Creates a new {@link VideoSampleSink} for the given {@link InputVideoTrack}. */
    constructor(videoTrack, decoderOptions = {}) {
      if (!(videoTrack instanceof InputVideoTrack)) {
        throw new TypeError("videoTrack must be an InputVideoTrack.");
      }
      validateVideoSinkDecoderOptions(decoderOptions);
      super();
      this._track = videoTrack;
      this._decoderOptions = decoderOptions;
    }
    /** @internal */
    async _createDecoder(onSample, onError) {
      if (!await this._track.canDecode()) {
        throw new Error(
          "This video track cannot be decoded by this browser. Make sure to check decodability before using a track."
        );
      }
      const codec = await this._track.getCodec();
      const rotation = await this._track.getRotation();
      let decoderConfig = await this._track.getDecoderConfig();
      const timeResolution = await this._track.getTimeResolution();
      assert(codec && decoderConfig);
      decoderConfig = {
        ...decoderConfig,
        hardwareAcceleration: this._decoderOptions.hardwareAcceleration,
        optimizeForLatency: this._decoderOptions.optimizeForLatency
      };
      return new VideoDecoderWrapper(onSample, onError, codec, decoderConfig, rotation, timeResolution);
    }
    /** @internal */
    _createPacketSink() {
      return new EncodedPacketSink(this._track);
    }
    /**
     * Retrieves the video sample (frame) corresponding to the given timestamp, in seconds. More specifically, returns
     * the last video sample (in presentation order) with a start timestamp less than or equal to the given timestamp.
     * Returns null if the timestamp is before the track's first timestamp.
     *
     * @param timestamp - The timestamp used for retrieval, in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    async getSample(timestamp, options = {}) {
      validateTimestamp(timestamp);
      for await (const sample of this.mediaSamplesAtTimestamps([timestamp], options)) {
        return sample;
      }
      throw new Error("Internal error: Iterator returned nothing.");
    }
    /**
     * Creates an async iterator that yields the video samples (frames) of this track in presentation order. This method
     * will intelligently pre-decode a few frames ahead to enable fast iteration.
     *
     * @param startTimestamp - The timestamp in seconds at which to start yielding samples (inclusive).
     * @param endTimestamp - The timestamp in seconds at which to stop yielding samples (exclusive).
     * @param options - Options used for the underlying packet retrieval.
     */
    samples(startTimestamp, endTimestamp, options = {}) {
      return this.mediaSamplesInRange(startTimestamp, endTimestamp, options);
    }
    /**
     * Creates an async iterator that yields a video sample (frame) for each timestamp in the argument. This method
     * uses an optimized decoding pipeline if these timestamps are monotonically sorted, decoding each packet at most
     * once, and is therefore more efficient than manually getting the sample for every timestamp. The iterator may
     * yield null if no frame is available for a given timestamp.
     *
     * This method is good for sparse access of media data. If you want primarily sequential media access, prefer
     * {@link VideoSampleSink.samples} instead.
     *
     * @param timestamps - An iterable or async iterable of timestamps in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    samplesAtTimestamps(timestamps, options = {}) {
      return this.mediaSamplesAtTimestamps(timestamps, options);
    }
  };
  var CanvasSink = class {
    /** Creates a new {@link CanvasSink} for the given {@link InputVideoTrack}. */
    constructor(videoTrack, options = {}) {
      /** @internal */
      this._rotation = 0;
      /** @internal */
      this._initPromise = null;
      /** @internal */
      this._nextCanvasIndex = 0;
      if (!(videoTrack instanceof InputVideoTrack)) {
        throw new TypeError("videoTrack must be an InputVideoTrack.");
      }
      if (options && typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.alpha !== void 0 && typeof options.alpha !== "boolean") {
        throw new TypeError("options.alpha, when provided, must be a boolean.");
      }
      if (options.width !== void 0 && (!Number.isInteger(options.width) || options.width <= 0)) {
        throw new TypeError("options.width, when defined, must be a positive integer.");
      }
      if (options.height !== void 0 && (!Number.isInteger(options.height) || options.height <= 0)) {
        throw new TypeError("options.height, when defined, must be a positive integer.");
      }
      if (options.fit !== void 0 && !["fill", "contain", "cover"].includes(options.fit)) {
        throw new TypeError('options.fit, when provided, must be one of "fill", "contain", or "cover".');
      }
      if (options.width !== void 0 && options.height !== void 0 && options.fit === void 0) {
        throw new TypeError(
          "When both options.width and options.height are provided, options.fit must also be provided."
        );
      }
      if (options.rotation !== void 0 && ![0, 90, 180, 270].includes(options.rotation)) {
        throw new TypeError("options.rotation, when provided, must be 0, 90, 180 or 270.");
      }
      if (options.crop !== void 0) {
        validateCropRectangle(options.crop, "options.");
      }
      if (options.poolSize !== void 0 && (typeof options.poolSize !== "number" || !Number.isInteger(options.poolSize) || options.poolSize < 0)) {
        throw new TypeError("poolSize must be a non-negative integer.");
      }
      if (options.decoderOptions !== void 0) {
        validateVideoSinkDecoderOptions(options.decoderOptions);
      }
      this._videoTrack = videoTrack;
      this._alpha = options.alpha ?? false;
      this._options = options;
      this._fit = options.fit ?? "fill";
      this._videoSampleSink = new VideoSampleSink(videoTrack, options.decoderOptions);
      this._canvasPool = Array.from({ length: options.poolSize ?? 0 }, () => null);
    }
    /** @internal */
    _ensureInit() {
      return this._initPromise ??= (async () => {
        const options = this._options;
        const videoTrack = this._videoTrack;
        const rotation = options.rotation ?? await videoTrack.getRotation();
        const squarePixelWidth = await videoTrack.getSquarePixelWidth();
        const squarePixelHeight = await videoTrack.getSquarePixelHeight();
        const [rotatedWidth, rotatedHeight] = rotation % 180 === 0 ? [squarePixelWidth, squarePixelHeight] : [squarePixelHeight, squarePixelWidth];
        let crop = options.crop;
        if (crop) {
          crop = clampCropRectangle(crop, rotatedWidth, rotatedHeight);
        }
        let [width, height] = crop ? [crop.width, crop.height] : [rotatedWidth, rotatedHeight];
        const originalAspectRatio = width / height;
        if (options.width !== void 0 && options.height === void 0) {
          width = options.width;
          height = Math.round(width / originalAspectRatio);
        } else if (options.width === void 0 && options.height !== void 0) {
          height = options.height;
          width = Math.round(height * originalAspectRatio);
        } else if (options.width !== void 0 && options.height !== void 0) {
          width = options.width;
          height = options.height;
        }
        this._width = width;
        this._height = height;
        this._rotation = rotation;
        this._crop = crop;
      })();
    }
    /** @internal */
    _videoSampleToWrappedCanvas(sample) {
      const width = this._width;
      const height = this._height;
      let canvas = this._canvasPool[this._nextCanvasIndex];
      let canvasIsNew = false;
      if (!canvas) {
        if (typeof document !== "undefined") {
          canvas = document.createElement("canvas");
          canvas.width = width;
          canvas.height = height;
        } else {
          canvas = new OffscreenCanvas(width, height);
        }
        if (this._canvasPool.length > 0) {
          this._canvasPool[this._nextCanvasIndex] = canvas;
        }
        canvasIsNew = true;
      }
      if (this._canvasPool.length > 0) {
        this._nextCanvasIndex = (this._nextCanvasIndex + 1) % this._canvasPool.length;
      }
      const context = canvas.getContext("2d", {
        alpha: this._alpha || isFirefox()
        // Firefox has VideoFrame glitches with opaque canvases
      });
      assert(context);
      sample._drawWithFitAndMipmapping(canvas, context, {
        fit: this._fit,
        rotation: this._rotation,
        crop: this._crop,
        targetIsFresh: canvasIsNew,
        fillBlack: !this._alpha && isFirefox()
      });
      const result = {
        canvas,
        timestamp: sample.timestamp,
        duration: sample.duration
      };
      sample.close();
      return result;
    }
    /**
     * Retrieves a canvas with the video frame corresponding to the given timestamp, in seconds. More specifically,
     * returns the last video frame (in presentation order) with a start timestamp less than or equal to the given
     * timestamp. Returns null if the timestamp is before the track's first timestamp.
     *
     * @param timestamp - The timestamp used for retrieval, in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    async getCanvas(timestamp, options) {
      validateTimestamp(timestamp);
      await this._ensureInit();
      const sample = await this._videoSampleSink.getSample(timestamp, options);
      return sample && this._videoSampleToWrappedCanvas(sample);
    }
    /**
     * Creates an async iterator that yields canvases with the video frames of this track in presentation order. This
     * method will intelligently pre-decode a few frames ahead to enable fast iteration.
     *
     * @param startTimestamp - The timestamp in seconds at which to start yielding canvases (inclusive).
     * @param endTimestamp - The timestamp in seconds at which to stop yielding canvases (exclusive).
     * @param options - Options used for the underlying packet retrieval.
     */
    async *canvases(startTimestamp, endTimestamp, options) {
      await this._ensureInit();
      yield* mapAsyncGenerator(
        this._videoSampleSink.samples(startTimestamp, endTimestamp, options),
        (sample) => this._videoSampleToWrappedCanvas(sample)
      );
    }
    /**
     * Creates an async iterator that yields a canvas for each timestamp in the argument. This method uses an optimized
     * decoding pipeline if these timestamps are monotonically sorted, decoding each packet at most once, and is
     * therefore more efficient than manually getting the canvas for every timestamp. The iterator may yield null if
     * no frame is available for a given timestamp.
     *
     * This method is good for sparse access of media data. If you want primarily sequential media access, prefer
     * {@link CanvasSink.canvases} instead.
     *
     * @param timestamps - An iterable or async iterable of timestamps in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    async *canvasesAtTimestamps(timestamps, options) {
      await this._ensureInit();
      yield* mapAsyncGenerator(
        this._videoSampleSink.samplesAtTimestamps(timestamps, options),
        (sample) => sample && this._videoSampleToWrappedCanvas(sample)
      );
    }
  };
  var AudioDecoderWrapper = class extends DecoderWrapper {
    constructor(onSample, onError, codec, decoderConfig) {
      super(onSample, onError);
      this.decoder = null;
      this.customDecoder = null;
      this.customDecoderCallSerializer = new CallSerializer();
      this.customDecoderQueueSize = 0;
      // Internal state to accumulate a precise current timestamp based on audio durations, not the (potentially
      // inaccurate) packet timestamps.
      this.currentTimestamp = null;
      // Chromium does not respect negative packet timestamps, so we must do the fixin' ourselves
      this.expectedFirstTimestamp = null;
      this.timestampOffset = 0;
      const sampleHandler = (sample) => {
        let sampleTimestamp = sample.timestamp;
        if (this.expectedFirstTimestamp && this.currentTimestamp === null) {
          this.timestampOffset = this.expectedFirstTimestamp - sampleTimestamp;
          ;
        }
        sampleTimestamp += this.timestampOffset;
        if (this.currentTimestamp === null || Math.abs(sampleTimestamp - this.currentTimestamp) >= sample.duration) {
          this.currentTimestamp = sampleTimestamp;
        }
        const preciseTimestamp = this.currentTimestamp;
        this.currentTimestamp += sample.duration;
        if (sample.numberOfFrames === 0) {
          sample.close();
          return;
        }
        const sampleRate = decoderConfig.sampleRate;
        sample.setTimestamp(Math.round(preciseTimestamp * sampleRate) / sampleRate);
        onSample(sample);
      };
      const MatchingCustomDecoder = customAudioDecoders.find((x) => x.supports(codec, decoderConfig));
      if (MatchingCustomDecoder) {
        this.customDecoder = new MatchingCustomDecoder();
        this.customDecoder.codec = codec;
        this.customDecoder.config = decoderConfig;
        this.customDecoder.onSample = (sample) => {
          if (!(sample instanceof AudioSample)) {
            throw new TypeError("The argument passed to onSample must be an AudioSample.");
          }
          sampleHandler(sample);
        };
        this.customDecoder.onError = (error) => {
          onError(error);
        };
        void this.customDecoderCallSerializer.call(() => this.customDecoder.init()).catch((error) => onError(error));
      } else {
        const stack = new Error("Decoding error").stack;
        this.decoder = new AudioDecoder({
          output: (data) => {
            try {
              sampleHandler(new AudioSample(data));
            } catch (error) {
              this.onError(error);
            }
          },
          error: (error) => {
            error.stack = stack;
            this.onError(error);
          }
        });
        this.decoder.configure(decoderConfig);
      }
    }
    getDecodeQueueSize() {
      if (this.customDecoder) {
        return this.customDecoderQueueSize;
      } else {
        assert(this.decoder);
        return this.decoder.decodeQueueSize;
      }
    }
    decode(packet) {
      if (this.customDecoder) {
        this.customDecoderQueueSize++;
        void this.customDecoderCallSerializer.call(() => this.customDecoder.decode(packet)).catch((error) => this.onError(error)).finally(() => this.customDecoderQueueSize--);
      } else {
        assert(this.decoder);
        this.expectedFirstTimestamp ??= packet.timestamp;
        this.decoder.decode(packet.toEncodedAudioChunk());
      }
    }
    async flush() {
      if (this.customDecoder) {
        await this.customDecoderCallSerializer.call(() => this.customDecoder.flush());
      } else {
        assert(this.decoder);
        await this.decoder.flush();
      }
      this.currentTimestamp = null;
      this.expectedFirstTimestamp = null;
      this.timestampOffset = 0;
    }
    close() {
      if (this.customDecoder) {
        void this.customDecoderCallSerializer.call(() => this.customDecoder.close());
      } else {
        assert(this.decoder);
        this.decoder.close();
      }
    }
  };
  var PcmAudioDecoderWrapper = class extends DecoderWrapper {
    constructor(onSample, onError, decoderConfig) {
      super(onSample, onError);
      this.decoderConfig = decoderConfig;
      // Internal state to accumulate a precise current timestamp based on audio durations, not the (potentially
      // inaccurate) packet timestamps.
      this.currentTimestamp = null;
      assert(PCM_AUDIO_CODECS.includes(decoderConfig.codec));
      this.codec = decoderConfig.codec;
      const { dataType, sampleSize, littleEndian } = parsePcmCodec(this.codec);
      this.inputSampleSize = sampleSize;
      switch (sampleSize) {
        case 1:
          {
            if (dataType === "unsigned") {
              this.readInputValue = (view2, byteOffset) => view2.getUint8(byteOffset) - 2 ** 7;
            } else if (dataType === "signed") {
              this.readInputValue = (view2, byteOffset) => view2.getInt8(byteOffset);
            } else if (dataType === "ulaw") {
              this.readInputValue = (view2, byteOffset) => fromUlaw(view2.getUint8(byteOffset));
            } else if (dataType === "alaw") {
              this.readInputValue = (view2, byteOffset) => fromAlaw(view2.getUint8(byteOffset));
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 2:
          {
            if (dataType === "unsigned") {
              this.readInputValue = (view2, byteOffset) => view2.getUint16(byteOffset, littleEndian) - 2 ** 15;
            } else if (dataType === "signed") {
              this.readInputValue = (view2, byteOffset) => view2.getInt16(byteOffset, littleEndian);
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 3:
          {
            if (dataType === "unsigned") {
              this.readInputValue = (view2, byteOffset) => getUint24(view2, byteOffset, littleEndian) - 2 ** 23;
            } else if (dataType === "signed") {
              this.readInputValue = (view2, byteOffset) => getInt24(view2, byteOffset, littleEndian);
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 4:
          {
            if (dataType === "unsigned") {
              this.readInputValue = (view2, byteOffset) => view2.getUint32(byteOffset, littleEndian) - 2 ** 31;
            } else if (dataType === "signed") {
              this.readInputValue = (view2, byteOffset) => view2.getInt32(byteOffset, littleEndian);
            } else if (dataType === "float") {
              this.readInputValue = (view2, byteOffset) => view2.getFloat32(byteOffset, littleEndian);
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 8:
          {
            if (dataType === "float") {
              this.readInputValue = (view2, byteOffset) => view2.getFloat64(byteOffset, littleEndian);
            } else {
              assert(false);
            }
          }
          ;
          break;
        default:
          {
            assertNever(sampleSize);
            assert(false);
          }
          ;
      }
      switch (sampleSize) {
        case 1:
          {
            if (dataType === "ulaw" || dataType === "alaw") {
              this.outputSampleSize = 2;
              this.outputFormat = "s16";
              this.writeOutputValue = (view2, byteOffset, value) => view2.setInt16(byteOffset, value, true);
            } else {
              this.outputSampleSize = 1;
              this.outputFormat = "u8";
              this.writeOutputValue = (view2, byteOffset, value) => view2.setUint8(byteOffset, value + 2 ** 7);
            }
          }
          ;
          break;
        case 2:
          {
            this.outputSampleSize = 2;
            this.outputFormat = "s16";
            this.writeOutputValue = (view2, byteOffset, value) => view2.setInt16(byteOffset, value, true);
          }
          ;
          break;
        case 3:
          {
            this.outputSampleSize = 4;
            this.outputFormat = "s32";
            this.writeOutputValue = (view2, byteOffset, value) => view2.setInt32(byteOffset, value << 8, true);
          }
          ;
          break;
        case 4:
          {
            this.outputSampleSize = 4;
            if (dataType === "float") {
              this.outputFormat = "f32";
              this.writeOutputValue = (view2, byteOffset, value) => view2.setFloat32(byteOffset, value, true);
            } else {
              this.outputFormat = "s32";
              this.writeOutputValue = (view2, byteOffset, value) => view2.setInt32(byteOffset, value, true);
            }
          }
          ;
          break;
        case 8:
          {
            this.outputSampleSize = 4;
            this.outputFormat = "f32";
            this.writeOutputValue = (view2, byteOffset, value) => view2.setFloat32(byteOffset, value, true);
          }
          ;
          break;
        default:
          {
            assertNever(sampleSize);
            assert(false);
          }
          ;
      }
      ;
    }
    getDecodeQueueSize() {
      return 0;
    }
    decode(packet) {
      const inputView = toDataView(packet.data);
      const numberOfFrames = packet.byteLength / this.decoderConfig.numberOfChannels / this.inputSampleSize;
      const outputBufferSize = numberOfFrames * this.decoderConfig.numberOfChannels * this.outputSampleSize;
      const outputBuffer = new ArrayBuffer(outputBufferSize);
      const outputView = new DataView(outputBuffer);
      for (let i = 0; i < numberOfFrames * this.decoderConfig.numberOfChannels; i++) {
        const inputIndex = i * this.inputSampleSize;
        const outputIndex = i * this.outputSampleSize;
        const value = this.readInputValue(inputView, inputIndex);
        this.writeOutputValue(outputView, outputIndex, value);
      }
      const preciseDuration = numberOfFrames / this.decoderConfig.sampleRate;
      if (this.currentTimestamp === null || Math.abs(packet.timestamp - this.currentTimestamp) >= preciseDuration) {
        this.currentTimestamp = packet.timestamp;
      }
      const preciseTimestamp = this.currentTimestamp;
      this.currentTimestamp += preciseDuration;
      const audioSample = new AudioSample({
        format: this.outputFormat,
        data: outputBuffer,
        numberOfChannels: this.decoderConfig.numberOfChannels,
        sampleRate: this.decoderConfig.sampleRate,
        numberOfFrames,
        timestamp: preciseTimestamp
      });
      this.onSample(audioSample);
    }
    async flush() {
    }
    close() {
    }
  };
  var AudioSampleSink = class extends BaseMediaSampleSink {
    /** Creates a new {@link AudioSampleSink} for the given {@link InputAudioTrack}. */
    constructor(audioTrack) {
      if (!(audioTrack instanceof InputAudioTrack)) {
        throw new TypeError("audioTrack must be an InputAudioTrack.");
      }
      super();
      this._track = audioTrack;
    }
    /** @internal */
    async _createDecoder(onSample, onError) {
      if (!await this._track.canDecode()) {
        throw new Error(
          "This audio track cannot be decoded by this browser. Make sure to check decodability before using a track."
        );
      }
      const codec = await this._track.getCodec();
      const decoderConfig = await this._track.getDecoderConfig();
      assert(codec && decoderConfig);
      if (PCM_AUDIO_CODECS.includes(decoderConfig.codec)) {
        return new PcmAudioDecoderWrapper(onSample, onError, decoderConfig);
      } else {
        return new AudioDecoderWrapper(onSample, onError, codec, decoderConfig);
      }
    }
    /** @internal */
    _createPacketSink() {
      return new EncodedPacketSink(this._track);
    }
    /**
     * Retrieves the audio sample corresponding to the given timestamp, in seconds. More specifically, returns
     * the last audio sample (in presentation order) with a start timestamp less than or equal to the given timestamp.
     * Returns null if the timestamp is before the track's first timestamp.
     *
     * @param timestamp - The timestamp used for retrieval, in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    async getSample(timestamp, options = {}) {
      validateTimestamp(timestamp);
      for await (const sample of this.mediaSamplesAtTimestamps([timestamp], options)) {
        return sample;
      }
      throw new Error("Internal error: Iterator returned nothing.");
    }
    /**
     * Creates an async iterator that yields the audio samples of this track in presentation order. This method
     * will intelligently pre-decode a few samples ahead to enable fast iteration.
     *
     * @param startTimestamp - The timestamp in seconds at which to start yielding samples (inclusive).
     * @param endTimestamp - The timestamp in seconds at which to stop yielding samples (exclusive).
     * @param options - Options used for the underlying packet retrieval.
     */
    samples(startTimestamp, endTimestamp, options = {}) {
      return this.mediaSamplesInRange(startTimestamp, endTimestamp, options);
    }
    /**
     * Creates an async iterator that yields an audio sample for each timestamp in the argument. This method
     * uses an optimized decoding pipeline if these timestamps are monotonically sorted, decoding each packet at most
     * once, and is therefore more efficient than manually getting the sample for every timestamp. The iterator may
     * yield null if no sample is available for a given timestamp.
     *
     * This method is good for sparse access of media data. If you want primarily sequential media access, prefer
     * {@link AudioSampleSink.samples} instead.
     *
     * @param timestamps - An iterable or async iterable of timestamps in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    samplesAtTimestamps(timestamps, options = {}) {
      return this.mediaSamplesAtTimestamps(timestamps, options);
    }
  };
  var AudioBufferSink = class {
    /** Creates a new {@link AudioBufferSink} for the given {@link InputAudioTrack}. */
    constructor(audioTrack) {
      if (!(audioTrack instanceof InputAudioTrack)) {
        throw new TypeError("audioTrack must be an InputAudioTrack.");
      }
      this._audioSampleSink = new AudioSampleSink(audioTrack);
    }
    /** @internal */
    _audioSampleToWrappedArrayBuffer(sample) {
      const result = {
        buffer: sample.toAudioBuffer(),
        timestamp: sample.timestamp,
        duration: sample.duration
      };
      sample.close();
      return result;
    }
    /**
     * Retrieves the audio buffer corresponding to the given timestamp, in seconds. More specifically, returns
     * the last audio buffer (in presentation order) with a start timestamp less than or equal to the given timestamp.
     * Returns null if the timestamp is before the track's first timestamp.
     *
     * @param timestamp - The timestamp used for retrieval, in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    async getBuffer(timestamp, options) {
      validateTimestamp(timestamp);
      const data = await this._audioSampleSink.getSample(timestamp, options);
      return data && this._audioSampleToWrappedArrayBuffer(data);
    }
    /**
     * Creates an async iterator that yields audio buffers of this track in presentation order. This method
     * will intelligently pre-decode a few buffers ahead to enable fast iteration.
     *
     * @param startTimestamp - The timestamp in seconds at which to start yielding buffers (inclusive).
     * @param endTimestamp - The timestamp in seconds at which to stop yielding buffers (exclusive).
     * @param options - Options used for the underlying packet retrieval.
     */
    buffers(startTimestamp, endTimestamp, options) {
      return mapAsyncGenerator(
        this._audioSampleSink.samples(startTimestamp, endTimestamp, options),
        (data) => this._audioSampleToWrappedArrayBuffer(data)
      );
    }
    /**
     * Creates an async iterator that yields an audio buffer for each timestamp in the argument. This method
     * uses an optimized decoding pipeline if these timestamps are monotonically sorted, decoding each packet at most
     * once, and is therefore more efficient than manually getting the buffer for every timestamp. The iterator may
     * yield null if no buffer is available for a given timestamp.
     *
     * @param timestamps - An iterable or async iterable of timestamps in seconds.
     * @param options - Options used for the underlying packet retrieval.
     */
    buffersAtTimestamps(timestamps, options) {
      return mapAsyncGenerator(
        this._audioSampleSink.samplesAtTimestamps(timestamps, options),
        (data) => data && this._audioSampleToWrappedArrayBuffer(data)
      );
    }
  };

  // src/input-track.ts
  var InputTrack = class _InputTrack {
    /** @internal */
    constructor(input, backing) {
      this.input = input;
      this._backing = backing;
    }
    /** Returns true if and only if this track is a video track. */
    isVideoTrack() {
      return this instanceof InputVideoTrack;
    }
    /** Returns true if and only if this track is an audio track. */
    isAudioTrack() {
      return this instanceof InputAudioTrack;
    }
    /** The unique ID of this track in the input file. */
    get id() {
      return this._backing.getId();
    }
    /**
     * The 1-based index of this track among all tracks of the same type in the input file. For example, the first
     * video track has number 1, the second video track has number 2, and so on. The index refers to the order in
     * which the tracks are returned by {@link Input.getTracks}.
     */
    get number() {
      return this._backing.getNumber();
    }
    /**
     * Returns the identifier of the codec used internally by the container. It is not homogenized by Mediabunny
     * and depends entirely on the container format.
     *
     * This method can be used to determine the codec of a track in case Mediabunny doesn't know that codec.
     *
     * - For ISOBMFF files, this resolves to the name of the Sample Description Box (e.g. `'avc1'`).
     * - For Matroska files, this resolves to the value of the `CodecID` element.
     * - For WAVE files, this resolves to the value of the format tag in the `'fmt '` chunk.
     * - For ADTS files, this resolves to the `MPEG-4 Audio Object Type`.
     * - For MPEG-TS files, this resolves to the `streamType` value from the Program Map Table.
     * - In all other cases, this resolves to `null`.
     */
    async getInternalCodecId() {
      return this._backing.getInternalCodecId();
    }
    /**
     * See {@link InputTrack.getInternalCodecId}.
     * @deprecated Use {@link InputTrack.getInternalCodecId} instead.
     */
    get internalCodecId() {
      return requireSync(this._backing.getInternalCodecId(), "internalCodecId", "getInternalCodecId");
    }
    /**
     * Returns the ISO 639-2/T language code for this track. If the language is unknown, this resolves to `'und'`
     * (undetermined).
     */
    async getLanguageCode() {
      return this._backing.getLanguageCode();
    }
    /**
     * The ISO 639-2/T language code for this track. If the language is unknown, this field is `'und'` (undetermined).
     * @deprecated Use {@link InputTrack.getLanguageCode} instead.
     */
    get languageCode() {
      return requireSync(this._backing.getLanguageCode(), "languageCode", "getLanguageCode");
    }
    /** Returns the user-defined name for this track. */
    async getName() {
      return this._backing.getName();
    }
    /**
     * A user-defined name for this track.
     * @deprecated Use {@link InputTrack.getName} instead.
     */
    get name() {
      return requireSync(this._backing.getName(), "name", "getName");
    }
    /**
     * Returns a positive number x such that all timestamps and durations of all packets of this track are
     * integer multiples of 1/x.
     */
    async getTimeResolution() {
      return this._backing.getTimeResolution();
    }
    /**
     * A positive number x such that all timestamps and durations of all packets of this track are
     * integer multiples of 1/x.
     * @deprecated Use {@link InputTrack.getTimeResolution} instead.
     */
    get timeResolution() {
      return requireSync(this._backing.getTimeResolution(), "timeResolution", "getTimeResolution");
    }
    /**
     * Returns whether the timestamps of this track are relative to the Unix epoch (January 1, 1970 00:00:00 UTC).
     * When `true`, each timestamp maps to a definitive point in time.
     */
    async isRelativeToUnixEpoch() {
      return this._backing.isRelativeToUnixEpoch();
    }
    /**
     * Returns the Unix time (in seconds since January 1, 1970 00:00:00 UTC) that the given track timestamp (in seconds)
     * maps to, or `null` if there is no such mapping. This provides a piecewise-continuous mapping from this track's
     * timestamp space into wall-clock time. Such mapping exists, for example, for HLS playlists with
     * `#EXT-X-PROGRAM-DATE-TIME` tags present.
     *
     * This mapping can be available even when {@link InputTrack.isRelativeToUnixEpoch} is `false`, for example for HLS
     * streams with program date time information but with {@link HlsInputFormatOptions.offsetTimestampsByDateTime}
     * set to `false`.
     */
    async getUnixTimeForTimestamp(timestamp) {
      return this._backing.getUnixTimeForTimestamp(timestamp);
    }
    /**
     * Whether the track's timestamps can be mapped to Unix wall clock time via
     * {@link InputTrack.getUnixTimeForTimestamp}.
     */
    async hasUnixTimeMapping() {
      return await this._backing.getUnixTimeForTimestamp(await this.getFirstTimestamp()) !== null;
    }
    /** Returns the track's disposition, i.e. information about its intended usage. */
    async getDisposition() {
      return this._backing.getDisposition();
    }
    /**
     * The track's disposition, i.e. information about its intended usage.
     * @deprecated Use {@link InputTrack.getDisposition} instead.
     */
    get disposition() {
      return requireSync(this._backing.getDisposition(), "disposition", "getDisposition");
    }
    /**
     * Returns the peak bitrate of the track in bits per second, as specified in the track's metadata. This might not
     * match the actual media data's bitrate.
     */
    async getBitrate() {
      return this._backing.getBitrate();
    }
    /**
     * Returns the average bitrate of the track in bits per second, as specified in the track's metadata. This might
     * not match the actual media data's bitrate.
     */
    async getAverageBitrate() {
      return this._backing.getAverageBitrate();
    }
    /**
     * Returns the start timestamp of the first packet of this track, in seconds. While often near zero, this value
     * may be positive or even negative. A negative starting timestamp means the track's timing has been offset. Samples
     * with a negative timestamp should not be presented.
     */
    async getFirstTimestamp() {
      const firstPacket = await this._backing.getFirstPacket({ metadataOnly: true });
      return firstPacket?.timestamp ?? 0;
    }
    /**
     * Returns the end timestamp of the last packet of this track, in seconds.
     *
     * By default, when the underlying media is live, this method will only resolve once the live stream ends. If you
     * want to query the current end timestamp of the stream, set {@link PacketRetrievalOptions.skipLiveWait} to `true`
     * in the options.
     */
    async computeDuration(options) {
      const lastPacket = await this._backing.getPacket(Infinity, { metadataOnly: true, ...options });
      const result = (lastPacket?.timestamp ?? 0) + (lastPacket?.duration ?? 0);
      return roundToDivisor(result, await this.getTimeResolution());
    }
    /**
     * Gets the duration (end timestamp) in seconds of this track from metadata stored in the file. This value may be
     * approximate or diverge from the actual, precise duration returned by `.computeDuration()`, but compared to that
     * method, this method is cheaper. When the duration cannot be determined from the file metadata, `null`
     * is returned.
     *
     * By default, when the underlying media is live, this method will only resolve once the live stream
     * ends. If you want to query the current duration of the media, set
     * {@link DurationMetadataRequestOptions.skipLiveWait} to `true` in the options.
     */
    async getDurationFromMetadata(options = {}) {
      return this._backing.getDurationFromMetadata(options);
    }
    /**
     * Computes aggregate packet statistics for this track, such as average packet rate or bitrate.
     *
     * @param targetPacketCount - This optional parameter sets a target for how many packets this method must have
     * looked at before it can return early; this means, you can use it to aggregate only a subset (prefix) of all
     * packets. This is very useful for getting a great estimate of video frame rate without having to scan through the
     * entire file.
     *
     * By default, when the underlying media is live and `targetPacketCount` is not set, this method will only resolve
     * once the live stream ends. If you want to query the current packet statistics of the stream, set
     * {@link PacketRetrievalOptions.skipLiveWait} to `true` in the options.
     */
    async computePacketStats(targetPacketCount = Infinity, options) {
      const sink = new EncodedPacketSink(this);
      let startTimestamp = Infinity;
      let endTimestamp = -Infinity;
      let packetCount = 0;
      let totalPacketBytes = 0;
      for await (const packet of sink.packets(void 0, void 0, { metadataOnly: true, ...options })) {
        if (packetCount >= targetPacketCount && packet.timestamp >= endTimestamp) {
          break;
        }
        startTimestamp = Math.min(startTimestamp, packet.timestamp);
        endTimestamp = Math.max(endTimestamp, packet.timestamp + packet.duration);
        packetCount++;
        totalPacketBytes += packet.byteLength;
      }
      return {
        packetCount,
        averagePacketRate: packetCount ? Number((packetCount / (endTimestamp - startTimestamp)).toPrecision(16)) : 0,
        averageBitrate: packetCount ? Number((8 * totalPacketBytes / (endTimestamp - startTimestamp)).toPrecision(16)) : 0
      };
    }
    /**
     * Whether or not this track is currently live, meaning the media's end is still unknown.
     *
     * The value returned by this method may change over time as the track stops being live. To keep track of the
     * track's live status, poll this method at the track's refresh interval
     * via {@link InputTrack.getLiveRefreshInterval}.
     */
    async isLive() {
      return await this._backing.getLiveRefreshInterval() !== null;
    }
    /**
     * Returns the track's live refresh interval in seconds, or `null` if the track is not live. This interval describes
     * the time it takes, on average, for new live media data to become available.
     */
    async getLiveRefreshInterval() {
      return this._backing.getLiveRefreshInterval();
    }
    /**
     * Returns `true` if this track can be paired with the given track. Two tracks being pairable means they can be
     * presented (displayed) together.
     *
     * Returns `false` if `other` equals `this`.
     */
    canBePairedWith(other) {
      if (!(other instanceof _InputTrack)) {
        throw new TypeError("other must be an InputTrack.");
      }
      if (this.input !== other.input || this === other) {
        return false;
      }
      return (this._backing.getPairingMask() & other._backing.getPairingMask()) !== 0n;
    }
    /**
     * Gets the list of other tracks that can be paired with this track. An optional query can be provided to narrow
     * down the results.
     */
    async getPairableTracks(query) {
      return this.input.getTracks(mergeInputTrackQueries({
        filter: (t) => t.canBePairedWith(this)
      }, query));
    }
    /**
     * Gets the list of other video tracks that can be paired with this track. An optional query can be provided to
     * narrow down the results.
     */
    async getPairableVideoTracks(query) {
      return this.input.getVideoTracks(mergeInputTrackQueries({
        filter: (t) => t.canBePairedWith(this)
      }, query));
    }
    /**
     * Gets the list of other audio tracks that can be paired with this track. An optional query can be provided to
     * narrow down the results.
     */
    async getPairableAudioTracks(query) {
      return this.input.getAudioTracks(mergeInputTrackQueries({
        filter: (t) => t.canBePairedWith(this)
      }, query));
    }
    /** Returns the primary track that can be paired with this track, optionally steered by the provided query. */
    async getPrimaryPairableVideoTrack(query) {
      return this.input.getPrimaryVideoTrack(mergeInputTrackQueries({
        filter: (t) => t.canBePairedWith(this)
      }, query));
    }
    /** Returns the primary track that can be paired with this track, optionally steered by the provided query. */
    async getPrimaryPairableAudioTrack(query) {
      return this.input.getPrimaryAudioTrack(mergeInputTrackQueries({
        filter: (t) => t.canBePairedWith(this)
      }, query));
    }
    /** Returns `true` if there is another track that can be paired with this track. */
    async hasPairableTrack(predicate) {
      predicate &&= toValidatedPredicate(predicate);
      const tracks = await this.input.getTracks();
      for (const track of tracks) {
        if (!this.canBePairedWith(track)) {
          continue;
        }
        if (!predicate || await predicate(track)) {
          return true;
        }
      }
      return false;
    }
    /** Returns `true` if there is a video track that can be paired with this track. */
    hasPairableVideoTrack(predicate) {
      predicate &&= toValidatedPredicate(predicate);
      return this.hasPairableTrack(
        async (x) => x.isVideoTrack() && (!predicate || await predicate(x))
      );
    }
    /** Returns `true` if there is an audio track that can be paired with this track. */
    hasPairableAudioTrack(predicate) {
      predicate &&= toValidatedPredicate(predicate);
      return this.hasPairableTrack(
        async (x) => x.isAudioTrack() && (!predicate || await predicate(x))
      );
    }
  };
  var requireSync = (value, getterName, asyncName) => {
    if (value instanceof Promise) {
      throw new Error(
        `'${getterName}' is deprecated and not available synchronously for this track. Use the preferred '${asyncName}()' instead.`
      );
    }
    return value;
  };
  var toValidatedPredicate = (predicate) => {
    if (predicate !== void 0 && typeof predicate !== "function") {
      throw new TypeError("predicate, when provided, must be a function.");
    }
    return predicate ? (track) => {
      const handle = (result2) => {
        if (typeof result2 !== "boolean") {
          throw new TypeError("predicate must return or resolve to a boolean value.");
        }
        return result2;
      };
      const result = predicate(track);
      if (result instanceof Promise) {
        return result.then(handle);
      }
      return handle(result);
    } : void 0;
  };
  var InputVideoTrack = class extends InputTrack {
    /** @internal */
    constructor(input, backing) {
      super(input, backing);
      /** @internal */
      this._pixelAspectRatioCache = null;
      this._backing = backing;
    }
    get type() {
      return "video";
    }
    /** The codec of the track's packets. */
    async getCodec() {
      return this._backing.getCodec();
    }
    /**
     * The codec of the track's packets.
     * @deprecated Use {@link InputVideoTrack.getCodec} instead.
     */
    get codec() {
      return requireSync(this._backing.getCodec(), "codec", "getCodec");
    }
    async hasOnlyKeyPackets() {
      return await this._backing.getHasOnlyKeyPackets?.() ?? await this._backing.getCodec() === "prores";
    }
    /** Returns the width in pixels of the track's coded samples, before any transformations or rotations. */
    async getCodedWidth() {
      return this._backing.getCodedWidth();
    }
    /**
     * The width in pixels of the track's coded samples, before any transformations or rotations.
     * @deprecated Use {@link InputVideoTrack.getCodedWidth} instead.
     */
    get codedWidth() {
      return requireSync(this._backing.getCodedWidth(), "codedWidth", "getCodedWidth");
    }
    /** Returns the height in pixels of the track's coded samples, before any transformations or rotations. */
    async getCodedHeight() {
      return this._backing.getCodedHeight();
    }
    /**
     * The height in pixels of the track's coded samples, before any transformations or rotations.
     * @deprecated Use {@link InputVideoTrack.getCodedHeight} instead.
     */
    get codedHeight() {
      return requireSync(this._backing.getCodedHeight(), "codedHeight", "getCodedHeight");
    }
    /** Returns the angle in degrees by which the track's frames should be rotated (clockwise). */
    async getRotation() {
      return this._backing.getRotation();
    }
    /**
     * The angle in degrees by which the track's frames should be rotated (clockwise).
     * @deprecated Use {@link InputVideoTrack.getRotation} instead.
     */
    get rotation() {
      return requireSync(this._backing.getRotation(), "rotation", "getRotation");
    }
    /**
     * Returns the width of the track's frames in square pixels, adjusted for pixel aspect ratio but before rotation.
     */
    async getSquarePixelWidth() {
      return this._backing.getSquarePixelWidth();
    }
    /**
     * The width of the track's frames in square pixels, adjusted for pixel aspect ratio but before rotation.
     * @deprecated Use {@link InputVideoTrack.getSquarePixelWidth} instead.
     */
    get squarePixelWidth() {
      return requireSync(this._backing.getSquarePixelWidth(), "squarePixelWidth", "getSquarePixelWidth");
    }
    /**
     * Returns the height of the track's frames in square pixels, adjusted for pixel aspect ratio but before rotation.
     */
    async getSquarePixelHeight() {
      return this._backing.getSquarePixelHeight();
    }
    /**
     * The height of the track's frames in square pixels, adjusted for pixel aspect ratio but before rotation.
     * @deprecated Use {@link InputVideoTrack.getSquarePixelHeight} instead.
     */
    get squarePixelHeight() {
      return requireSync(this._backing.getSquarePixelHeight(), "squarePixelHeight", "getSquarePixelHeight");
    }
    /**
     * Returns the pixel aspect ratio of the track's frames as a rational number in its reduced form. Most videos use
     * square pixels (1:1).
     */
    async getPixelAspectRatio() {
      return this._pixelAspectRatioCache ??= simplifyRational({
        num: await this.getSquarePixelWidth() * await this.getCodedHeight(),
        den: await this.getSquarePixelHeight() * await this.getCodedWidth()
      });
    }
    /**
     * The pixel aspect ratio of the track's frames, as a rational number in its reduced form. Most videos use
     * square pixels (1:1).
     * @deprecated Use {@link InputVideoTrack.getPixelAspectRatio} instead.
     */
    get pixelAspectRatio() {
      return this._pixelAspectRatioCache ??= simplifyRational({
        num: requireSync(this._backing.getSquarePixelWidth(), "pixelAspectRatio", "getPixelAspectRatio") * requireSync(this._backing.getCodedHeight(), "pixelAspectRatio", "getPixelAspectRatio"),
        den: requireSync(this._backing.getSquarePixelHeight(), "pixelAspectRatio", "getPixelAspectRatio") * requireSync(this._backing.getCodedWidth(), "pixelAspectRatio", "getPixelAspectRatio")
      });
    }
    /** Returns the display width of the track's frames in pixels, after aspect ratio adjustment and rotation. */
    async getDisplayWidth() {
      const metadata = await this._backing.getMetadataDisplayWidth?.();
      if (metadata != null) {
        return metadata;
      }
      const rotation = await this.getRotation();
      return rotation % 180 === 0 ? this.getSquarePixelWidth() : this.getSquarePixelHeight();
    }
    /**
     * The display width of the track's frames in pixels, after aspect ratio adjustment and rotation.
     * @deprecated Use {@link InputVideoTrack.getDisplayWidth} instead.
     */
    get displayWidth() {
      const metadataRaw = this._backing.getMetadataDisplayWidth?.();
      if (metadataRaw !== void 0) {
        const metadata = requireSync(metadataRaw, "displayWidth", "getDisplayWidth");
        if (metadata !== null) {
          return metadata;
        }
      }
      const rotation = requireSync(this._backing.getRotation(), "displayWidth", "getDisplayWidth");
      const value = rotation % 180 === 0 ? this._backing.getSquarePixelWidth() : this._backing.getSquarePixelHeight();
      return requireSync(value, "displayWidth", "getDisplayWidth");
    }
    /** Returns the display height of the track's frames in pixels, after aspect ratio adjustment and rotation. */
    async getDisplayHeight() {
      const metadata = await this._backing.getMetadataDisplayHeight?.();
      if (metadata != null) {
        return metadata;
      }
      const rotation = await this.getRotation();
      return rotation % 180 === 0 ? this.getSquarePixelHeight() : this.getSquarePixelWidth();
    }
    /**
     * The display height of the track's frames in pixels, after aspect ratio adjustment and rotation.
     * @deprecated Use {@link InputVideoTrack.getDisplayHeight} instead.
     */
    get displayHeight() {
      const metadataRaw = this._backing.getMetadataDisplayHeight?.();
      if (metadataRaw !== void 0) {
        const metadata = requireSync(metadataRaw, "displayHeight", "getDisplayHeight");
        if (metadata !== null) {
          return metadata;
        }
      }
      const rotation = requireSync(this._backing.getRotation(), "displayHeight", "getDisplayHeight");
      const value = rotation % 180 === 0 ? this._backing.getSquarePixelHeight() : this._backing.getSquarePixelWidth();
      return requireSync(value, "displayHeight", "getDisplayHeight");
    }
    /** Returns the color space of the track's samples. */
    async getColorSpace() {
      return this._backing.getColorSpace();
    }
    /** If this method returns true, the track's samples use a high dynamic range (HDR). */
    async hasHighDynamicRange() {
      const colorSpace = await this._backing.getColorSpace();
      return colorSpace.primaries === "bt2020" || colorSpace.primaries === "smpte432" || colorSpace.transfer === "pq" || colorSpace.transfer === "hlg" || colorSpace.matrix === "bt2020-ncl";
    }
    /** Checks if this track may contain transparent samples with alpha data. */
    async canBeTransparent() {
      return this._backing.canBeTransparent();
    }
    /**
     * Returns the [decoder configuration](https://www.w3.org/TR/webcodecs/#video-decoder-config) for decoding the
     * track's packets using a [`VideoDecoder`](https://developer.mozilla.org/en-US/docs/Web/API/VideoDecoder). Returns
     * null if the track's codec is unknown.
     */
    async getDecoderConfig() {
      return this._backing.getDecoderConfig();
    }
    async getCodecParameterString() {
      const fromMetadata = await this._backing.getMetadataCodecParameterString?.();
      if (fromMetadata != null) {
        return fromMetadata;
      }
      const decoderConfig = await this._backing.getDecoderConfig();
      return decoderConfig?.codec ?? null;
    }
    async canDecode() {
      try {
        const decoderConfig = await this._backing.getDecoderConfig();
        if (!decoderConfig) {
          return false;
        }
        const codec = await this._backing.getCodec();
        assert(codec !== null);
        if (customVideoDecoders.some((x) => x.supports(codec, decoderConfig))) {
          return true;
        }
        if (typeof VideoDecoder === "undefined") {
          return false;
        }
        const support = await VideoDecoder.isConfigSupported(decoderConfig);
        return support.supported === true;
      } catch (error) {
        Logging._error("Error during decodability check:", error);
        return false;
      }
    }
    async determinePacketType(packet) {
      if (!(packet instanceof EncodedPacket)) {
        throw new TypeError("packet must be an EncodedPacket.");
      }
      if (packet.isMetadataOnly) {
        throw new TypeError("packet must not be metadata-only to determine its type.");
      }
      const codec = await this.getCodec();
      if (codec === null) {
        return null;
      }
      const decoderConfig = await this.getDecoderConfig();
      assert(decoderConfig);
      return determineVideoPacketType(codec, decoderConfig, packet.data);
    }
    /**
     * Computes frame rate metrics for this video track, i.e. estimates the video's frame rate. Frame rate is never
     * determined from file metadata (which is unreliable) but is always deduced directly from the actual frame
     * timestamps.
     */
    async computeFrameRateMetrics(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.targetPacketCount !== void 0 && (!Number.isFinite(options.targetPacketCount) || options.targetPacketCount < 0)) {
        throw new TypeError("options.targetPacketCount must be a non-negative number.");
      }
      const timeResolution = await this.getTimeResolution();
      const targetPacketCount = options.targetPacketCount ?? 256;
      const sink = new EncodedPacketSink(this);
      const timestamps = [];
      let maxTimestamp = -Infinity;
      let probedPacketCount = 0;
      for await (const packet of sink.packets(void 0, void 0, { metadataOnly: true })) {
        if (timestamps.length >= targetPacketCount && packet.timestamp >= maxTimestamp) {
          break;
        }
        timestamps.push(packet.timestamp);
        maxTimestamp = Math.max(maxTimestamp, packet.timestamp);
        probedPacketCount++;
      }
      const ticks = new Float64Array(timestamps.length);
      for (let i = 0; i < timestamps.length; i++) {
        ticks[i] = Math.round(timestamps[i] * timeResolution);
      }
      ticks.sort();
      let n = 1;
      for (let i = 1; i < ticks.length; i++) {
        if (ticks[i] !== ticks[n - 1]) {
          ticks[n++] = ticks[i];
        }
      }
      if (n < 2) {
        return {
          underlyingFrameRate: null,
          bestGuessFrameRate: timeResolution,
          minFrameRate: timeResolution,
          maxFrameRate: timeResolution,
          averageFrameRate: timeResolution,
          medianFrameRate: timeResolution,
          frameRateIsConstant: true,
          probedPacketCount
        };
      }
      const activeTicks = ticks.subarray(0, n);
      const underlyingFrameRate = findUnderlyingFrameRate(activeTicks, timeResolution);
      const unitRate = underlyingFrameRate ?? timeResolution;
      const ticksPerFrame = underlyingFrameRate !== null ? timeResolution / underlyingFrameRate : null;
      const histogram = /* @__PURE__ */ new Map();
      let minDifference = Infinity;
      let maxDifference = -Infinity;
      let totalDifference = 0;
      for (let i = 1; i < n; i++) {
        const tickDifference = activeTicks[i] - activeTicks[i - 1];
        const difference = ticksPerFrame !== null ? Math.max(1, Math.round(tickDifference / ticksPerFrame)) : tickDifference;
        histogram.set(difference, (histogram.get(difference) ?? 0) + 1);
        minDifference = Math.min(minDifference, difference);
        maxDifference = Math.max(maxDifference, difference);
        totalDifference += difference;
      }
      const differenceCount = n - 1;
      const sortedDifferences = [...histogram.keys()].sort((a, b) => a - b);
      const middleA = differenceCount - 1 >> 1;
      const middleB = differenceCount >> 1;
      let medianDifferenceA = 0;
      let medianDifferenceB = 0;
      let cumulativeCount = 0;
      for (const difference of sortedDifferences) {
        cumulativeCount += histogram.get(difference);
        if (medianDifferenceA === 0 && cumulativeCount > middleA) {
          medianDifferenceA = difference;
        }
        if (cumulativeCount > middleB) {
          medianDifferenceB = difference;
          break;
        }
      }
      const medianFrameRate = (unitRate / medianDifferenceA + unitRate / medianDifferenceB) / 2;
      return {
        underlyingFrameRate,
        bestGuessFrameRate: underlyingFrameRate !== null ? underlyingFrameRate : getBestGuessFrameRate(medianFrameRate),
        minFrameRate: unitRate / maxDifference,
        maxFrameRate: unitRate / minDifference,
        averageFrameRate: unitRate * differenceCount / totalDifference,
        medianFrameRate,
        frameRateIsConstant: underlyingFrameRate !== null && minDifference === 1 && maxDifference === 1,
        probedPacketCount
      };
    }
  };
  var InputAudioTrack = class extends InputTrack {
    /** @internal */
    constructor(input, backing) {
      super(input, backing);
      this._backing = backing;
    }
    get type() {
      return "audio";
    }
    /** The codec of the track's packets. */
    async getCodec() {
      return this._backing.getCodec();
    }
    /**
     * The codec of the track's packets.
     * @deprecated Use {@link InputAudioTrack.getCodec} instead.
     */
    get codec() {
      return requireSync(this._backing.getCodec(), "codec", "getCodec");
    }
    async hasOnlyKeyPackets() {
      return await this._backing.getHasOnlyKeyPackets?.() ?? true;
    }
    /** Returns the number of audio channels in the track. */
    async getNumberOfChannels() {
      return this._backing.getNumberOfChannels();
    }
    /**
     * The number of audio channels in the track.
     * @deprecated Use {@link InputAudioTrack.getNumberOfChannels} instead.
     */
    get numberOfChannels() {
      return requireSync(this._backing.getNumberOfChannels(), "numberOfChannels", "getNumberOfChannels");
    }
    /** Returns the track's audio sample rate in hertz. */
    async getSampleRate() {
      return this._backing.getSampleRate();
    }
    /**
     * The track's audio sample rate in hertz.
     * @deprecated Use {@link InputAudioTrack.getSampleRate} instead.
     */
    get sampleRate() {
      return requireSync(this._backing.getSampleRate(), "sampleRate", "getSampleRate");
    }
    /**
     * Returns the [decoder configuration](https://www.w3.org/TR/webcodecs/#audio-decoder-config) for decoding the
     * track's packets using an [`AudioDecoder`](https://developer.mozilla.org/en-US/docs/Web/API/AudioDecoder). Returns
     * null if the track's codec is unknown.
     */
    async getDecoderConfig() {
      return this._backing.getDecoderConfig();
    }
    async getCodecParameterString() {
      const fromMetadata = await this._backing.getMetadataCodecParameterString?.();
      if (fromMetadata != null) {
        return fromMetadata;
      }
      const decoderConfig = await this._backing.getDecoderConfig();
      return decoderConfig?.codec ?? null;
    }
    async canDecode() {
      try {
        const decoderConfig = await this._backing.getDecoderConfig();
        if (!decoderConfig) {
          return false;
        }
        const codec = await this._backing.getCodec();
        assert(codec !== null);
        if (customAudioDecoders.some((x) => x.supports(codec, decoderConfig))) {
          return true;
        }
        if (decoderConfig.codec.startsWith("pcm-")) {
          return true;
        } else {
          if (typeof AudioDecoder === "undefined") {
            return false;
          }
          const support = await AudioDecoder.isConfigSupported(decoderConfig);
          return support.supported === true;
        }
      } catch (error) {
        Logging._error("Error during decodability check:", error);
        return false;
      }
    }
    async determinePacketType(packet) {
      if (!(packet instanceof EncodedPacket)) {
        throw new TypeError("packet must be an EncodedPacket.");
      }
      if (await this.getCodec() === null) {
        return null;
      }
      return "key";
    }
  };
  var asc = (value) => {
    return value ?? Infinity;
  };
  var desc = (value) => {
    return -(value ?? -Infinity);
  };
  var prefer = (value) => {
    return -value;
  };
  var toValidatedInputTrackQuery = (query) => {
    if (typeof query !== "object" || !query) {
      throw new TypeError("query must be an object.");
    }
    if (query.filter !== void 0 && typeof query.filter !== "function") {
      throw new TypeError("query.filter, when provided, must be a function.");
    }
    if (query.sortBy !== void 0 && typeof query.sortBy !== "function") {
      throw new TypeError("query.sortBy, when provided, must be a function.");
    }
    return {
      filter: query.filter ? (track) => {
        const handle = (bool) => {
          if (typeof bool !== "boolean") {
            throw new TypeError("query.filter must return or resolve to a boolean.");
          }
          return bool;
        };
        const result = query.filter(track);
        if (result instanceof Promise) {
          return result.then(handle);
        } else {
          return handle(result);
        }
      } : void 0,
      sortBy: query.sortBy ? (track) => {
        const handle = (value) => {
          if (typeof value !== "number" && (!Array.isArray(value) || !value.every((x) => typeof x === "number"))) {
            throw new TypeError(
              "query.sortBy must return or resolve to a number or an array of numbers."
            );
          }
          return value;
        };
        const result = query.sortBy(track);
        if (result instanceof Promise) {
          return result.then(handle);
        } else {
          return handle(result);
        }
      } : void 0
    };
  };
  var mergeInputTrackQueries = (queryA, queryB) => {
    return {
      filter: queryA?.filter || queryB?.filter ? (track) => {
        const resultA = queryA?.filter?.(track) ?? true;
        const handleResultA = (resultA2) => {
          if (resultA2 === false) {
            return false;
          }
          return queryB?.filter?.(track) ?? true;
        };
        if (resultA instanceof Promise) {
          return resultA.then(handleResultA);
        } else {
          return handleResultA(resultA);
        }
      } : void 0,
      sortBy: queryA?.sortBy || queryB?.sortBy ? (track) => {
        const resultA = queryA?.sortBy?.(track) ?? [];
        const resultB = queryB?.sortBy?.(track) ?? [];
        const join = (resultA2, resultB2) => {
          return [
            ...Array.isArray(resultA2) ? resultA2 : [resultA2],
            ...Array.isArray(resultB2) ? resultB2 : [resultB2]
          ];
        };
        if (resultA instanceof Promise || resultB instanceof Promise) {
          return Promise.all([resultA, resultB]).then(([resultA2, resultB2]) => {
            return join(resultA2, resultB2);
          });
        } else {
          return join(resultA, resultB);
        }
      } : void 0
    };
  };
  var queryInputTracks = async (tracks, query) => {
    let matched = tracks;
    if (query?.filter) {
      const filterMatches = tracks.map((t) => query.filter(t));
      const hasAsyncFilter = filterMatches.some((x) => x instanceof Promise);
      if (hasAsyncFilter) {
        const resolvedFilterMatches = await Promise.all(filterMatches);
        matched = tracks.filter((_, i) => resolvedFilterMatches[i]);
      } else {
        matched = tracks.filter((_, i) => filterMatches[i]);
      }
    }
    if (!query?.sortBy) {
      return matched;
    }
    const sortValues = matched.map((t) => query.sortBy(t));
    const hasAsyncSort = sortValues.some((x) => x instanceof Promise);
    const resolvedSortValues = hasAsyncSort ? await Promise.all(sortValues) : sortValues;
    return matched.map((track, i) => ({ track, sortValue: resolvedSortValues[i] })).sort((a, b) => {
      const aValues = Array.isArray(a.sortValue) ? a.sortValue : [a.sortValue];
      const bValues = Array.isArray(b.sortValue) ? b.sortValue : [b.sortValue];
      const maxLength = Math.max(aValues.length, bValues.length);
      for (let i = 0; i < maxLength; i++) {
        const aValue = aValues[i] ?? 0;
        const bValue = bValues[i] ?? 0;
        if (aValue === bValue) {
          continue;
        }
        return aValue - bValue;
      }
      return 0;
    }).map((x) => x.track);
  };
  var findUnderlyingFrameRate = (ticks, resolution) => {
    const MAX_DENOMINATOR = 1e6;
    const MIN_INLIER_RATIO = 0.98;
    const DELTA_TOLERANCE = 1 + 1e-9;
    const MAX_EFFECTIVE_FRAME_SPAN = 1e3;
    const KNOWN_FRAME_RATES = [
      12,
      15,
      20,
      24e3 / 1001,
      24,
      25,
      3e4 / 1001,
      30,
      48,
      50,
      6e4 / 1001,
      60,
      100,
      12e4 / 1001,
      120,
      144,
      240
    ];
    if (ticks.length < 2) {
      return null;
    }
    const gaps = new Float64Array(ticks.length - 1);
    for (let i = 1; i < ticks.length; i++) {
      const gap = ticks[i] - ticks[i - 1];
      if (!(gap > 0)) {
        return null;
      }
      gaps[i - 1] = gap;
    }
    const sortedGaps = gaps.slice();
    sortedGaps.sort();
    let period = sortedGaps[Math.floor(sortedGaps.length * 0.05)];
    for (let iteration = 0; iteration < 6; iteration++) {
      let totalTicks2 = 0;
      let totalFrames2 = 0;
      for (const gap of gaps) {
        const multiple = Math.max(1, Math.round(gap / period));
        if (Math.abs(gap - multiple * period) >= DELTA_TOLERANCE) {
          continue;
        }
        totalTicks2 += gap;
        totalFrames2 += multiple;
      }
      if (totalFrames2 === 0) {
        return null;
      }
      const refinedPeriod = totalTicks2 / totalFrames2;
      if (Math.abs(refinedPeriod - period) <= 1e-12 * Math.max(1, period)) {
        period = refinedPeriod;
        break;
      }
      period = refinedPeriod;
    }
    let inlierCount = 0;
    let totalTicks = 0;
    let totalFrames = 0;
    for (const gap of gaps) {
      const multiple = Math.max(1, Math.round(gap / period));
      if (Math.abs(gap - multiple * period) >= DELTA_TOLERANCE) {
        continue;
      }
      inlierCount++;
      totalTicks += gap;
      totalFrames += multiple;
    }
    if (inlierCount / gaps.length < MIN_INLIER_RATIO) {
      return null;
    }
    period = totalTicks / totalFrames;
    const uncertainty = 1 / Math.min(
      totalFrames,
      MAX_EFFECTIVE_FRAME_SPAN
    );
    const periodLo = Math.max(Number.EPSILON, period - uncertainty);
    const periodHi = period + uncertainty;
    const fpsLo = resolution / periodHi;
    const fpsHi = resolution / periodLo;
    const fittedFps = resolution / period;
    let fps = null;
    let bestKnownError = Infinity;
    for (const candidate of KNOWN_FRAME_RATES) {
      if (candidate < fpsLo || candidate > fpsHi) {
        continue;
      }
      const error = Math.abs(candidate / fittedFps - 1);
      if (error < bestKnownError) {
        fps = candidate;
        bestKnownError = error;
      }
    }
    if (fps === null) {
      const periodFraction = simplestFractionBetween(
        periodLo,
        periodHi,
        MAX_DENOMINATOR
      );
      const fpsFraction = simplestFractionBetween(
        fpsLo,
        fpsHi,
        MAX_DENOMINATOR
      );
      if (fpsFraction && (!periodFraction || fpsFraction.den < periodFraction.den || fpsFraction.den === periodFraction.den && fpsFraction.num <= periodFraction.num)) {
        fps = fpsFraction.num / fpsFraction.den;
      } else if (periodFraction) {
        fps = resolution * periodFraction.den / periodFraction.num;
      } else {
        return null;
      }
    }
    const finalPeriod = resolution / fps;
    let finalInlierCount = 0;
    for (const gap of gaps) {
      const multiple = Math.max(1, Math.round(gap / finalPeriod));
      if (Math.abs(gap - multiple * finalPeriod) < DELTA_TOLERANCE) {
        finalInlierCount++;
      }
    }
    if (finalInlierCount / gaps.length < MIN_INLIER_RATIO) {
      return null;
    }
    return fps;
  };
  var simplestFractionBetween = (lo, hi, maxDenominator) => {
    for (let den = 1; den <= maxDenominator; den++) {
      const num = Math.floor(lo * den) + 1;
      if (num / den < hi) {
        return simplifyRational({ num, den });
      }
    }
    return null;
  };
  var getBestGuessFrameRate = (frameRate) => {
    const SPECIAL_FRAME_RATES = [
      24 / 1.001,
      30 / 1.001,
      60 / 1.001,
      120 / 1.001
    ];
    const COMMON_FRAME_RATES = [
      12,
      15,
      20,
      24,
      25,
      30,
      48,
      50,
      60,
      100,
      120,
      144,
      240
    ];
    const SPECIAL_TOLERANCE = 5e-4;
    const COMMON_TOLERANCE = 0.025;
    for (const candidate of SPECIAL_FRAME_RATES) {
      if (Math.abs(candidate / frameRate - 1) <= SPECIAL_TOLERANCE) {
        return candidate;
      }
    }
    let best = frameRate;
    let bestError = Infinity;
    for (const candidate of COMMON_FRAME_RATES) {
      const error = Math.abs(candidate / frameRate - 1);
      if (error <= COMMON_TOLERANCE && error < bestError) {
        best = candidate;
        bestError = error;
      }
    }
    return best;
  };

  // src/input.ts
  polyfillSymbolDispose();
  var DEFAULT_SOURCE_CACHE_GROUP = 1;
  var ENCRYPTION_KEY_CACHE_GROUP = 2;
  var Input = class _Input extends EventEmitter {
    /**
     * Creates a new input file from the specified options. No reading operations will be performed until methods are
     * called on this instance.
     */
    constructor(options) {
      super();
      /** @internal */
      this._demuxerPromise = null;
      /** @internal */
      this._format = null;
      /** @internal */
      this._trackBackingsCache = null;
      /** @internal */
      this._backingToTrack = /* @__PURE__ */ new Map();
      /** @internal */
      this._disposed = false;
      /** @internal */
      this._nextSourceCacheAge = 0;
      /** @internal */
      this._sourceRefs = [];
      /** @internal */
      this._sourceCache = [];
      /** @internal */
      this._sourceCachePromises = [];
      /** @internal */
      this._onFormatDetermined = null;
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!Array.isArray(options.formats) || options.formats.some((x) => !(x instanceof InputFormat))) {
        throw new TypeError("options.formats must be an array of InputFormat.");
      }
      if (!(options.source instanceof Source || options.source instanceof SourceRef)) {
        throw new TypeError("options.source must be a Source or SourceRef.");
      }
      if (options.source instanceof Source && options.source._disposed) {
        throw new TypeError("options.source must not be a disposed Source.");
      }
      if (options.initInput !== void 0 && !(options.initInput instanceof _Input)) {
        throw new TypeError("options.initInput, when provided, must be an Input.");
      }
      if (options.formatOptions !== void 0) {
        validateInputFormatOptions(options.formatOptions, "formatOptions");
      }
      this._formats = options.formats;
      this._initInput = options.initInput ?? null;
      this._formatOptions = options.formatOptions ?? {};
      if (options.source instanceof Source) {
        this._rootRef = options.source.ref();
      } else {
        this._rootRef = options.source;
      }
      this._sourceRefs.push(this._rootRef);
    }
    /** True if the input has been disposed. */
    get disposed() {
      return this._disposed;
    }
    /** @internal */
    get _rootSource() {
      return this._rootRef.source;
    }
    /** @internal */
    async _getSourceUncached(request) {
      assert(this._rootSource instanceof PathedSource);
      const ref = await this._rootSource._resolveRequest(request);
      this._emit("source", { source: ref.source, request, isRoot: request.isRoot });
      return ref;
    }
    /** @internal */
    _getSourceCached(request, cacheGroup = DEFAULT_SOURCE_CACHE_GROUP) {
      const cachedEntry = this._sourceCache.find(
        (x) => x.cacheGroup === cacheGroup && sourceRequestsAreEqual(x.request, request)
      );
      if (cachedEntry) {
        cachedEntry.age++;
        return Promise.resolve(cachedEntry.sourceRef.source.ref());
      }
      const cachedPromiseEntry = this._sourceCachePromises.find(
        (x) => x.cacheGroup === cacheGroup && sourceRequestsAreEqual(x.request, request)
      );
      if (cachedPromiseEntry) {
        return cachedPromiseEntry.promise.then((x) => x.sourceRef.source.ref());
      }
      const promise = (async () => {
        const sourceRef = await this._getSourceUncached(request);
        const MAX_SOURCE_CACHE_SIZE = 4;
        const count = arrayCount(
          this._sourceCache,
          (x) => x.cacheGroup === cacheGroup && x.sourceRef.source._refCount === 1
        );
        if (count >= MAX_SOURCE_CACHE_SIZE) {
          const minAgeIndex = arrayArgmin(
            this._sourceCache,
            (x) => x.cacheGroup === cacheGroup && x.sourceRef.source._refCount === 1 ? x.age : Infinity
          );
          assert(minAgeIndex !== -1);
          const entry = this._sourceCache[minAgeIndex];
          this._sourceCache.splice(minAgeIndex, 1);
          entry.sourceRef.free();
          removeItem(this._sourceRefs, entry.sourceRef);
        }
        this._sourceRefs.push(sourceRef);
        const promiseIndex = this._sourceCachePromises.findIndex((x) => x.request === request);
        assert(promiseIndex !== -1);
        this._sourceCachePromises.splice(promiseIndex, 1);
        const cacheEntry = {
          request,
          sourceRef,
          age: this._nextSourceCacheAge++,
          cacheGroup
        };
        return cacheEntry;
      })();
      this._sourceCachePromises.push({
        request,
        cacheGroup,
        promise
      });
      return promise.then((entry) => {
        const ref = entry.sourceRef.source.ref();
        this._sourceCache.push(entry);
        return ref;
      });
    }
    /** @internal */
    _getDemuxer() {
      return this._demuxerPromise ??= (async () => {
        this._reader = new Reader12(this._rootSource);
        this._emit("source", { source: this._rootSource, request: null, isRoot: true });
        for (const format of this._formats) {
          const canRead = await format._canReadInput(this);
          if (canRead) {
            this._format = format;
            this._onFormatDetermined?.(format);
            return format._createDemuxer(this);
          }
        }
        throw new UnsupportedInputFormatError();
      })();
    }
    /**
     * Returns the source from which this input file reads data for the root path.
     */
    get source() {
      return this._rootSource;
    }
    /**
     * Returns the format of the input file. You can compare this result directly to the {@link InputFormat} singletons
     * or use `instanceof` checks for subset-aware logic (for example, `format instanceof MatroskaInputFormat` is true
     * for both MKV and WebM).
     */
    async getFormat() {
      await this._getDemuxer();
      assert(this._format);
      return this._format;
    }
    /** Returns `true` if the format of the input file is known and the file can be read, `false` otherwise. */
    async canRead() {
      try {
        await this._getDemuxer();
        return true;
      } catch (error) {
        if (error instanceof UnsupportedInputFormatError) {
          return false;
        }
        throw error;
      }
    }
    /**
     * Returns the timestamp at which the input file starts. More precisely, returns the smallest starting timestamp
     * among all tracks.
     *
     * Optionally, you can pass in the list of tracks for which you want to compute the starting timestamp.
     *
     * Note that this method is potentially expensive for inputs with many tracks (such as HLS manifests), since it
     * probes every track.
     */
    async getFirstTimestamp(tracks) {
      tracks ??= await this.getTracks();
      const filtered = tracks.filter((x) => x !== null);
      if (filtered.length === 0) {
        return 0;
      }
      const firstPackets = await Promise.all(filtered.map((x) => x._backing.getFirstPacket({ metadataOnly: true })));
      const result = Math.min(...firstPackets.map((x) => x?.timestamp ?? Infinity));
      return result === Infinity ? 0 : result;
    }
    /**
     * Computes the duration of the input file, in seconds. More precisely, returns the largest end timestamp among
     * all tracks.
     *
     * Optionally, you can pass in the list of tracks for which you want to compute the duration.
     *
     * This method can be potentially expensive depending on the underlying file format, because it returns the most
     * accurate duration possible and must check all tracks. Use {@link Input.getDurationFromMetadata} for a faster but
     * less accurate estimate of duration.
     *
     * By default, when any track in the underlying media is live, this method will only resolve once the live stream
     * ends. If you want to query the current duration of the media, set {@link PacketRetrievalOptions.skipLiveWait}
     * to `true` in the options.
     */
    async computeDuration(tracks, options) {
      tracks ??= await this.getTracks();
      const filtered = tracks.filter((x) => x !== null);
      if (filtered.length === 0) {
        return 0;
      }
      const tracksDurations = await Promise.all(filtered.map((x) => x.computeDuration(options)));
      return Math.max(...tracksDurations);
    }
    /**
     * Gets the duration (end timestamp) in seconds of the input file from metadata stored in the file. This value may
     * be approximate or diverge from the actual, precise duration returned by `.computeDuration()`, but compared to
     * that method, this method is cheaper. When the duration cannot be determined from the file metadata, `null`
     * is returned.
     *
     * Optionally, you can pass in the list of tracks for which you want to get the duration from metadata.
     *
     * By default, when the underlying media is live, this method will only resolve once the live stream
     * ends. If you want to query the current duration of the media, set
     * {@link DurationMetadataRequestOptions.skipLiveWait} to `true` in the options.
     */
    async getDurationFromMetadata(tracks, options) {
      tracks ??= await this.getTracks();
      const filtered = tracks.filter((x) => x !== null);
      const tracksDurations = await Promise.all(filtered.map((x) => x.getDurationFromMetadata(options)));
      const nonNullDurations = tracksDurations.filter((x) => x !== null);
      if (nonNullDurations.length === 0) {
        return null;
      }
      return Math.max(...nonNullDurations);
    }
    /**
     * Returns the list of all tracks of this input file in the order in which they appear in the file. An optional
     * query can be provided.
     */
    async getTracks(query) {
      query &&= toValidatedInputTrackQuery(query);
      const backings = await this._getTrackBackings();
      const tracks = backings.map((backing) => this._wrapBackingAsTrack(backing));
      return queryInputTracks(tracks, query);
    }
    /** Returns the list of all video tracks of this input file. An optional query can be provided. */
    async getVideoTracks(query) {
      query &&= toValidatedInputTrackQuery(query);
      const tracks = await this.getTracks();
      const videoTracks = tracks.filter((x) => x.isVideoTrack());
      return queryInputTracks(videoTracks, query);
    }
    /** Returns the list of all audio tracks of this input file. An optional query can be provided. */
    async getAudioTracks(query) {
      query &&= toValidatedInputTrackQuery(query);
      const tracks = await this.getTracks();
      const audioTracks = tracks.filter((x) => x.isAudioTrack());
      return queryInputTracks(audioTracks, query);
    }
    /**
     * Returns the primary video track of this input file, or null if there are no video tracks.
     *
     * Multiple factors determine which track is considered primary, including its position in the file, disposition,
     * bitrate (higher bitrate is preferred), and if it can be paired with an audio track.
     */
    async getPrimaryVideoTrack(query) {
      query &&= toValidatedInputTrackQuery(query);
      const merged = mergeInputTrackQueries(query, {
        sortBy: async (t) => [
          prefer((await t.getDisposition()).default),
          prefer(await t.hasPairableAudioTrack()),
          prefer(!await t.hasOnlyKeyPackets()),
          desc(await t.getBitrate())
        ]
      });
      const sorted = await this.getVideoTracks(merged);
      return sorted[0] ?? null;
    }
    /**
     * Returns the primary audio track of this input file, or null if there are no audio tracks.
     *
     * Multiple factors determine which track is considered primary, including its position in the file, disposition,
     * bitrate (higher bitrate is preferred), and if it can be paired with the primary video track.
     */
    async getPrimaryAudioTrack(query) {
      query &&= toValidatedInputTrackQuery(query);
      const primaryVideoTrack = await this.getPrimaryVideoTrack();
      const merged = mergeInputTrackQueries(query, {
        sortBy: async (t) => [
          prefer(!primaryVideoTrack || t.canBePairedWith(primaryVideoTrack)),
          prefer((await t.getDisposition()).default),
          desc(await t.getBitrate())
        ]
      });
      const sorted = await this.getAudioTracks(merged);
      return sorted[0] ?? null;
    }
    /** @internal */
    async _getTrackBackings() {
      const demuxer = await this._getDemuxer();
      return this._trackBackingsCache ??= await demuxer.getTrackBackings();
    }
    /** @internal */
    _wrapBackingAsTrack(backing) {
      const existing = this._backingToTrack.get(backing);
      if (existing) {
        return existing;
      }
      const type = backing.getType();
      const track = type === "video" ? new InputVideoTrack(this, backing) : new InputAudioTrack(this, backing);
      this._backingToTrack.set(backing, track);
      return track;
    }
    /** Returns the full MIME type of this input file, including track codecs. */
    async getMimeType() {
      const demuxer = await this._getDemuxer();
      return demuxer.getMimeType();
    }
    /**
     * Returns descriptive metadata tags about the media file, such as title, author, date, cover art, or other
     * attached files.
     */
    async getMetadataTags() {
      const demuxer = await this._getDemuxer();
      return demuxer.getMetadataTags();
    }
    /**
     * Disposes this input and frees connected resources. When an input is disposed, ongoing read operations will be
     * canceled, all future read operations will fail, any open decoders will be closed, and all ongoing media sink
     * operations will be canceled. Disallowed and canceled operations will throw an {@link InputDisposedError}.
     *
     * You are expected not to use an input after disposing it. While some operations may still work, it is not
     * specified and may change in any future update.
     */
    dispose() {
      if (this._disposed) {
        return;
      }
      this._disposed = true;
      for (const ref of this._sourceRefs) {
        ref.free();
      }
      this._sourceRefs.length = 0;
      if (this._demuxerPromise) {
        void this._demuxerPromise.then((demuxer) => demuxer.dispose()).catch(() => {
        });
      }
    }
    /**
     * Calls `.dispose()` on the input, implementing the `Disposable` interface for use with
     * JavaScript Explicit Resource Management features.
     */
    [Symbol.dispose]() {
      this.dispose();
    }
  };
  var UnsupportedInputFormatError = class extends Error {
    /** Creates a new {@link UnsupportedInputFormatError}. */
    constructor(message = "Input has an unsupported or unrecognizable format.") {
      super(message);
      this.name = "UnsupportedInputFormatError";
    }
  };
  var InputDisposedError = class extends Error {
    /** Creates a new {@link InputDisposedError}. */
    constructor(message = "Input has been disposed.") {
      super(message);
      this.name = "InputDisposedError";
    }
  };

  // src/reader.ts
  var Reader12 = class {
    constructor(source) {
      this.source = source;
    }
    get fileSize() {
      const size = this.source._getFileSize();
      if (size === void 0) {
        throw new Error("Reading file size too early; read required first.");
      }
      return size;
    }
    get fileSizeNonStrict() {
      return this.source._getFileSize() ?? null;
    }
    requestSlice(start, length) {
      if (this.source._disposed) {
        throw new InputDisposedError();
      }
      if (start < 0) {
        return null;
      }
      if (this.fileSizeNonStrict !== null && start + length > this.fileSizeNonStrict) {
        return null;
      }
      if (length === 0) {
        const buffer = new Uint8Array(0);
        return new FileSlice4(buffer, toDataView(buffer), 0, start, start);
      }
      const end = start + length;
      const result = this.source._read(start, end, DEFAULT_MIN_READ_POSITION, DEFAULT_MAX_READ_POSITION);
      if (result instanceof Promise) {
        return result.then((x) => {
          if (!x) {
            return null;
          }
          return new FileSlice4(x.bytes, x.view, x.offset, start, end);
        });
      } else {
        if (!result) {
          return null;
        }
        return new FileSlice4(result.bytes, result.view, result.offset, start, end);
      }
    }
    requestSliceRange(start, minLength, maxLength) {
      if (this.source._disposed) {
        throw new InputDisposedError();
      }
      if (start < 0) {
        return null;
      }
      if (this.fileSizeNonStrict !== null) {
        return this.requestSlice(
          start,
          clamp(this.fileSizeNonStrict - start, minLength, maxLength)
        );
      } else {
        const promisedAttempt = this.requestSlice(start, maxLength);
        const handleAttempt = (attempt) => {
          if (attempt) {
            return attempt;
          }
          assert(this.fileSizeNonStrict !== null);
          return this.requestSlice(
            start,
            clamp(this.fileSizeNonStrict - start, minLength, maxLength)
          );
        };
        if (promisedAttempt instanceof Promise) {
          return promisedAttempt.then(handleAttempt);
        } else {
          return handleAttempt(promisedAttempt);
        }
      }
    }
    requestEntireFile() {
      if (this.fileSizeNonStrict !== null) {
        return this.requestSlice(0, this.fileSizeNonStrict);
      }
      const CHUNK_SIZE = 1024;
      return (async () => {
        const chunks = [];
        let currentSize = 0;
        while (true) {
          if (chunks.length === 1 && this.fileSizeNonStrict !== null) {
            return this.requestSlice(0, this.fileSizeNonStrict);
          }
          let slice = this.requestSliceRange(currentSize, 0, CHUNK_SIZE);
          if (slice instanceof Promise) slice = await slice;
          if (!slice || slice.length === 0) {
            break;
          }
          const chunk = readBytes(slice, slice.length);
          chunks.push(chunk);
          currentSize += slice.length;
        }
        const joined = new Uint8Array(currentSize);
        let offset = 0;
        for (const chunk of chunks) {
          joined.set(chunk, offset);
          offset += chunk.length;
        }
        return new FileSlice4(joined, toDataView(joined), 0, 0, currentSize);
      })();
    }
  };
  var FileSlice4 = class _FileSlice {
    constructor(bytes2, view2, offset, start, end) {
      this.bytes = bytes2;
      this.view = view2;
      this.offset = offset;
      this.start = start;
      this.end = end;
      this.bufferPos = start - offset;
    }
    static tempFromBytes(bytes2) {
      return new _FileSlice(
        bytes2,
        toDataView(bytes2),
        0,
        0,
        bytes2.length
      );
    }
    get length() {
      return this.end - this.start;
    }
    get filePos() {
      return this.offset + this.bufferPos;
    }
    set filePos(value) {
      this.bufferPos = value - this.offset;
    }
    /** The number of bytes left from the current pos to the end of the slice. */
    get remainingLength() {
      return Math.max(this.end - this.filePos, 0);
    }
    skip(byteCount) {
      this.bufferPos += byteCount;
    }
    /** Creates a new subslice of this slice whose byte range must be contained within this slice. */
    slice(filePos, length = this.end - filePos) {
      if (filePos < this.start || filePos + length > this.end) {
        throw new RangeError("Slicing outside of original slice.");
      }
      return new _FileSlice(
        this.bytes,
        this.view,
        this.offset,
        filePos,
        filePos + length
      );
    }
  };
  var checkIsInRange = (slice, bytesToRead) => {
    if (slice.filePos < slice.start || slice.filePos + bytesToRead > slice.end) {
      throw new RangeError(
        `Tried reading [${slice.filePos}, ${slice.filePos + bytesToRead}), but slice is [${slice.start}, ${slice.end}). This is likely an internal error, please report it alongside the file that caused it.`
      );
    }
  };
  var readBytes = (slice, length) => {
    checkIsInRange(slice, length);
    const bytes2 = slice.bytes.subarray(slice.bufferPos, slice.bufferPos + length);
    slice.bufferPos += length;
    return bytes2;
  };
  var readU8 = (slice) => {
    checkIsInRange(slice, 1);
    return slice.view.getUint8(slice.bufferPos++);
  };
  var readU16 = (slice, littleEndian) => {
    checkIsInRange(slice, 2);
    const value = slice.view.getUint16(slice.bufferPos, littleEndian);
    slice.bufferPos += 2;
    return value;
  };
  var readU16Be = (slice) => {
    checkIsInRange(slice, 2);
    const value = slice.view.getUint16(slice.bufferPos, false);
    slice.bufferPos += 2;
    return value;
  };
  var readU24Be = (slice) => {
    checkIsInRange(slice, 3);
    const value = getUint24(slice.view, slice.bufferPos, false);
    slice.bufferPos += 3;
    return value;
  };
  var readI16Be = (slice) => {
    checkIsInRange(slice, 2);
    const value = slice.view.getInt16(slice.bufferPos, false);
    slice.bufferPos += 2;
    return value;
  };
  var readU32 = (slice, littleEndian) => {
    checkIsInRange(slice, 4);
    const value = slice.view.getUint32(slice.bufferPos, littleEndian);
    slice.bufferPos += 4;
    return value;
  };
  var readU32Be = (slice) => {
    checkIsInRange(slice, 4);
    const value = slice.view.getUint32(slice.bufferPos, false);
    slice.bufferPos += 4;
    return value;
  };
  var readU32Le = (slice) => {
    checkIsInRange(slice, 4);
    const value = slice.view.getUint32(slice.bufferPos, true);
    slice.bufferPos += 4;
    return value;
  };
  var readI32Be = (slice) => {
    checkIsInRange(slice, 4);
    const value = slice.view.getInt32(slice.bufferPos, false);
    slice.bufferPos += 4;
    return value;
  };
  var readI32Le = (slice) => {
    checkIsInRange(slice, 4);
    const value = slice.view.getInt32(slice.bufferPos, true);
    slice.bufferPos += 4;
    return value;
  };
  var readU64 = (slice, littleEndian) => {
    let low;
    let high;
    if (littleEndian) {
      low = readU32(slice, true);
      high = readU32(slice, true);
    } else {
      high = readU32(slice, false);
      low = readU32(slice, false);
    }
    return high * 4294967296 + low;
  };
  var readU64Be = (slice) => {
    const high = readU32Be(slice);
    const low = readU32Be(slice);
    return high * 4294967296 + low;
  };
  var readI64Be = (slice) => {
    const high = readI32Be(slice);
    const low = readU32Be(slice);
    return high * 4294967296 + low;
  };
  var readI64Le = (slice) => {
    const low = readU32Le(slice);
    const high = readI32Le(slice);
    return high * 4294967296 + low;
  };
  var readF32Be = (slice) => {
    checkIsInRange(slice, 4);
    const value = slice.view.getFloat32(slice.bufferPos, false);
    slice.bufferPos += 4;
    return value;
  };
  var readF64Be = (slice) => {
    checkIsInRange(slice, 8);
    const value = slice.view.getFloat64(slice.bufferPos, false);
    slice.bufferPos += 8;
    return value;
  };
  var readAscii = (slice, length) => {
    checkIsInRange(slice, length);
    let str = "";
    for (let i = 0; i < length; i++) {
      str += String.fromCharCode(slice.bytes[slice.bufferPos++]);
    }
    return str;
  };
  var readAllLines = (slice, length, options) => {
    const text = textDecoder.decode(readBytes(slice, length));
    const lines = text.split("\n").map((x) => x.trim()).filter((x) => x.length > 0 && !options?.ignore?.(x));
    return lines;
  };

  // src/id3.ts
  var ID3_V1_TAG_SIZE = 128;
  var ID3_V2_HEADER_SIZE = 10;
  var ID3_V1_GENRES = [
    "Blues",
    "Classic rock",
    "Country",
    "Dance",
    "Disco",
    "Funk",
    "Grunge",
    "Hip-hop",
    "Jazz",
    "Metal",
    "New age",
    "Oldies",
    "Other",
    "Pop",
    "Rhythm and blues",
    "Rap",
    "Reggae",
    "Rock",
    "Techno",
    "Industrial",
    "Alternative",
    "Ska",
    "Death metal",
    "Pranks",
    "Soundtrack",
    "Euro-techno",
    "Ambient",
    "Trip-hop",
    "Vocal",
    "Jazz & funk",
    "Fusion",
    "Trance",
    "Classical",
    "Instrumental",
    "Acid",
    "House",
    "Game",
    "Sound clip",
    "Gospel",
    "Noise",
    "Alternative rock",
    "Bass",
    "Soul",
    "Punk",
    "Space",
    "Meditative",
    "Instrumental pop",
    "Instrumental rock",
    "Ethnic",
    "Gothic",
    "Darkwave",
    "Techno-industrial",
    "Electronic",
    "Pop-folk",
    "Eurodance",
    "Dream",
    "Southern rock",
    "Comedy",
    "Cult",
    "Gangsta",
    "Top 40",
    "Christian rap",
    "Pop/funk",
    "Jungle music",
    "Native US",
    "Cabaret",
    "New wave",
    "Psychedelic",
    "Rave",
    "Showtunes",
    "Trailer",
    "Lo-fi",
    "Tribal",
    "Acid punk",
    "Acid jazz",
    "Polka",
    "Retro",
    "Musical",
    "Rock 'n' roll",
    "Hard rock",
    "Folk",
    "Folk rock",
    "National folk",
    "Swing",
    "Fast fusion",
    "Bebop",
    "Latin",
    "Revival",
    "Celtic",
    "Bluegrass",
    "Avantgarde",
    "Gothic rock",
    "Progressive rock",
    "Psychedelic rock",
    "Symphonic rock",
    "Slow rock",
    "Big band",
    "Chorus",
    "Easy listening",
    "Acoustic",
    "Humour",
    "Speech",
    "Chanson",
    "Opera",
    "Chamber music",
    "Sonata",
    "Symphony",
    "Booty bass",
    "Primus",
    "Porn groove",
    "Satire",
    "Slow jam",
    "Club",
    "Tango",
    "Samba",
    "Folklore",
    "Ballad",
    "Power ballad",
    "Rhythmic Soul",
    "Freestyle",
    "Duet",
    "Punk rock",
    "Drum solo",
    "A cappella",
    "Euro-house",
    "Dance hall",
    "Goa music",
    "Drum & bass",
    "Club-house",
    "Hardcore techno",
    "Terror",
    "Indie",
    "Britpop",
    "Negerpunk",
    "Polsk punk",
    "Beat",
    "Christian gangsta rap",
    "Heavy metal",
    "Black metal",
    "Crossover",
    "Contemporary Christian",
    "Christian rock",
    "Merengue",
    "Salsa",
    "Thrash metal",
    "Anime",
    "Jpop",
    "Synthpop",
    "Christmas",
    "Art rock",
    "Baroque",
    "Bhangra",
    "Big beat",
    "Breakbeat",
    "Chillout",
    "Downtempo",
    "Dub",
    "EBM",
    "Eclectic",
    "Electro",
    "Electroclash",
    "Emo",
    "Experimental",
    "Garage",
    "Global",
    "IDM",
    "Illbient",
    "Industro-Goth",
    "Jam Band",
    "Krautrock",
    "Leftfield",
    "Lounge",
    "Math rock",
    "New romantic",
    "Nu-breakz",
    "Post-punk",
    "Post-rock",
    "Psytrance",
    "Shoegaze",
    "Space rock",
    "Trop rock",
    "World music",
    "Neoclassical",
    "Audiobook",
    "Audio theatre",
    "Neue Deutsche Welle",
    "Podcast",
    "Indie rock",
    "G-Funk",
    "Dubstep",
    "Garage rock",
    "Psybient"
  ];
  var parseId3V1Tag = (slice, tags) => {
    const startPos = slice.filePos;
    tags.raw ??= {};
    tags.raw["TAG"] ??= readBytes(slice, ID3_V1_TAG_SIZE - 3);
    slice.filePos = startPos;
    const title = readId3V1String(slice, 30);
    if (title) tags.title ??= title;
    const artist = readId3V1String(slice, 30);
    if (artist) tags.artist ??= artist;
    const album = readId3V1String(slice, 30);
    if (album) tags.album ??= album;
    const yearText = readId3V1String(slice, 4);
    const year = Number.parseInt(yearText, 10);
    if (Number.isInteger(year) && year > 0) {
      tags.date ??= new Date(String(year));
    }
    const commentBytes = readBytes(slice, 30);
    let comment;
    if (commentBytes[28] === 0 && commentBytes[29] !== 0) {
      const trackNum = commentBytes[29];
      if (trackNum > 0) {
        tags.trackNumber ??= trackNum;
      }
      slice.skip(-30);
      comment = readId3V1String(slice, 28);
      slice.skip(2);
    } else {
      slice.skip(-30);
      comment = readId3V1String(slice, 30);
    }
    if (comment) tags.comment ??= comment;
    const genreIndex = readU8(slice);
    if (genreIndex < ID3_V1_GENRES.length) {
      tags.genre ??= ID3_V1_GENRES[genreIndex];
    }
  };
  var readId3V1String = (slice, length) => {
    const bytes2 = readBytes(slice, length);
    const endIndex = coalesceIndex(bytes2.indexOf(0), bytes2.length);
    const relevantBytes = bytes2.subarray(0, endIndex);
    let str = "";
    for (let i = 0; i < relevantBytes.length; i++) {
      str += String.fromCharCode(relevantBytes[i]);
    }
    return str.trimEnd();
  };
  var readId3V2Header = (slice) => {
    const startPos = slice.filePos;
    const tag = readAscii(slice, 3);
    const majorVersion = readU8(slice);
    const revision = readU8(slice);
    const flags = readU8(slice);
    const sizeRaw = readU32Be(slice);
    if (tag !== "ID3" || majorVersion === 255 || revision === 255 || (sizeRaw & 2155905152) !== 0) {
      slice.filePos = startPos;
      return null;
    }
    let size = decodeSynchsafe(sizeRaw);
    if (flags & 16 /* Footer */) {
      size += ID3_V2_HEADER_SIZE;
    }
    return { majorVersion, revision, flags, size };
  };
  var parseId3V2Tag = (slice, header, tags) => {
    if (![2, 3, 4].includes(header.majorVersion)) {
      Logging._warn(`Unsupported ID3v2 major version: ${header.majorVersion}`);
      return;
    }
    const dataSize = header.flags & 16 /* Footer */ ? header.size - ID3_V2_HEADER_SIZE : header.size;
    const bytes2 = readBytes(slice, dataSize);
    const reader = new Id3V2Reader(header, bytes2);
    if (header.flags & 128 /* Unsynchronisation */ && header.majorVersion === 3) {
      reader.ununsynchronizeAll();
    }
    if (header.flags & 64 /* ExtendedHeader */) {
      const extendedHeaderSize = reader.readU32();
      if (header.majorVersion === 3) {
        reader.pos += extendedHeaderSize;
      } else {
        reader.pos += extendedHeaderSize - 4;
      }
    }
    while (reader.pos <= reader.bytes.length - reader.frameHeaderSize()) {
      const frame = reader.readId3V2Frame();
      if (!frame) {
        break;
      }
      const frameStartPos = reader.pos;
      const frameEndPos = reader.pos + frame.size;
      let frameEncrypted = false;
      let frameCompressed = false;
      let frameUnsynchronized = false;
      if (header.majorVersion === 3) {
        frameEncrypted = !!(frame.flags & 1 << 6);
        frameCompressed = !!(frame.flags & 1 << 7);
      } else if (header.majorVersion === 4) {
        frameEncrypted = !!(frame.flags & 1 << 2);
        frameCompressed = !!(frame.flags & 1 << 3);
        frameUnsynchronized = !!(frame.flags & 1 << 1) || !!(header.flags & 128 /* Unsynchronisation */);
      }
      if (frameEncrypted) {
        Logging._warn(`Skipping encrypted ID3v2 frame ${frame.id}`);
        reader.pos = frameEndPos;
        continue;
      }
      if (frameCompressed) {
        Logging._warn(`Skipping compressed ID3v2 frame ${frame.id}`);
        reader.pos = frameEndPos;
        continue;
      }
      if (frameUnsynchronized) {
        reader.ununsynchronizeRegion(reader.pos, frameEndPos);
      }
      tags.raw ??= {};
      if (frame.id === "TXXX") {
        const txxx = tags.raw["TXXX"] ??= {};
        const encoding = reader.readId3V2TextEncoding();
        const description = reader.readId3V2Text(encoding, frameEndPos);
        const value = reader.readId3V2Text(encoding, frameEndPos);
        txxx[description] ??= value;
      } else if (frame.id[0] === "T") {
        tags.raw[frame.id] ??= reader.readId3V2EncodingAndText(frameEndPos);
      } else {
        tags.raw[frame.id] ??= reader.readBytes(frame.size);
      }
      reader.pos = frameStartPos;
      switch (frame.id) {
        case "TIT2":
        case "TT2":
          {
            tags.title ??= reader.readId3V2EncodingAndText(frameEndPos);
          }
          ;
          break;
        case "TIT3":
        case "TT3":
          {
            tags.description ??= reader.readId3V2EncodingAndText(frameEndPos);
          }
          ;
          break;
        case "TPE1":
        case "TP1":
          {
            tags.artist ??= reader.readId3V2EncodingAndText(frameEndPos);
          }
          ;
          break;
        case "TALB":
        case "TAL":
          {
            tags.album ??= reader.readId3V2EncodingAndText(frameEndPos);
          }
          ;
          break;
        case "TPE2":
        case "TP2":
          {
            tags.albumArtist ??= reader.readId3V2EncodingAndText(frameEndPos);
          }
          ;
          break;
        case "TRCK":
        case "TRK":
          {
            const trackText = reader.readId3V2EncodingAndText(frameEndPos);
            const parts = trackText.split("/");
            const trackNum = Number.parseInt(parts[0], 10);
            const tracksTotal = parts[1] && Number.parseInt(parts[1], 10);
            if (Number.isInteger(trackNum) && trackNum > 0) {
              tags.trackNumber ??= trackNum;
            }
            if (tracksTotal && Number.isInteger(tracksTotal) && tracksTotal > 0) {
              tags.tracksTotal ??= tracksTotal;
            }
          }
          ;
          break;
        case "TPOS":
        case "TPA":
          {
            const discText = reader.readId3V2EncodingAndText(frameEndPos);
            const parts = discText.split("/");
            const discNum = Number.parseInt(parts[0], 10);
            const discsTotal = parts[1] && Number.parseInt(parts[1], 10);
            if (Number.isInteger(discNum) && discNum > 0) {
              tags.discNumber ??= discNum;
            }
            if (discsTotal && Number.isInteger(discsTotal) && discsTotal > 0) {
              tags.discsTotal ??= discsTotal;
            }
          }
          ;
          break;
        case "TCON":
        case "TCO":
          {
            const genreText = reader.readId3V2EncodingAndText(frameEndPos);
            let match = /^\((\d+)\)/.exec(genreText);
            if (match) {
              const genreNumber = Number.parseInt(match[1]);
              if (ID3_V1_GENRES[genreNumber] !== void 0) {
                tags.genre ??= ID3_V1_GENRES[genreNumber];
                break;
              }
            }
            match = /^\d+$/.exec(genreText);
            if (match) {
              const genreNumber = Number.parseInt(match[0]);
              if (ID3_V1_GENRES[genreNumber] !== void 0) {
                tags.genre ??= ID3_V1_GENRES[genreNumber];
                break;
              }
            }
            tags.genre ??= genreText;
          }
          ;
          break;
        case "TDRC":
        case "TDAT":
          {
            const dateText = reader.readId3V2EncodingAndText(frameEndPos);
            const date = new Date(dateText);
            if (!Number.isNaN(date.getTime())) {
              tags.date ??= date;
            }
          }
          ;
          break;
        case "TYER":
        case "TYE":
          {
            const yearText = reader.readId3V2EncodingAndText(frameEndPos);
            const year = Number.parseInt(yearText, 10);
            if (Number.isInteger(year)) {
              tags.date ??= new Date(String(year));
            }
          }
          ;
          break;
        case "USLT":
        case "ULT":
          {
            const encoding = reader.readU8();
            reader.pos += 3;
            reader.readId3V2Text(encoding, frameEndPos);
            tags.lyrics ??= reader.readId3V2Text(encoding, frameEndPos);
          }
          ;
          break;
        case "COMM":
        case "COM":
          {
            const encoding = reader.readU8();
            reader.pos += 3;
            reader.readId3V2Text(encoding, frameEndPos);
            tags.comment ??= reader.readId3V2Text(encoding, frameEndPos);
          }
          ;
          break;
        case "APIC":
        case "PIC":
          {
            const encoding = reader.readId3V2TextEncoding();
            let mimeType;
            if (header.majorVersion === 2) {
              const imageFormat = reader.readAscii(3);
              mimeType = imageFormat === "PNG" ? "image/png" : imageFormat === "JPG" ? "image/jpeg" : "image/*";
            } else {
              mimeType = reader.readId3V2Text(encoding, frameEndPos);
            }
            const pictureType = reader.readU8();
            const description = reader.readId3V2Text(encoding, frameEndPos).trimEnd();
            const imageDataSize = frameEndPos - reader.pos;
            if (imageDataSize >= 0) {
              const imageData = reader.readBytes(imageDataSize);
              if (!tags.images) tags.images = [];
              tags.images.push({
                data: imageData,
                mimeType,
                kind: pictureType === 3 ? "coverFront" : pictureType === 4 ? "coverBack" : "unknown",
                description
              });
            }
          }
          ;
          break;
        default:
          {
            reader.pos += frame.size;
          }
          ;
          break;
      }
      reader.pos = frameEndPos;
    }
  };
  var Id3V2Reader = class {
    constructor(header, bytes2) {
      this.header = header;
      this.bytes = bytes2;
      this.pos = 0;
      this.view = new DataView(bytes2.buffer, bytes2.byteOffset, bytes2.byteLength);
    }
    frameHeaderSize() {
      return this.header.majorVersion === 2 ? 6 : 10;
    }
    ununsynchronizeAll() {
      const newBytes = [];
      for (let i = 0; i < this.bytes.length; i++) {
        const value1 = this.bytes[i];
        newBytes.push(value1);
        if (value1 === 255 && i !== this.bytes.length - 1) {
          const value2 = this.bytes[i];
          if (value2 === 0) {
            i++;
          }
        }
      }
      this.bytes = new Uint8Array(newBytes);
      this.view = new DataView(this.bytes.buffer);
    }
    ununsynchronizeRegion(start, end) {
      const newBytes = [];
      for (let i = start; i < end; i++) {
        const value1 = this.bytes[i];
        newBytes.push(value1);
        if (value1 === 255 && i !== end - 1) {
          const value2 = this.bytes[i + 1];
          if (value2 === 0) {
            i++;
          }
        }
      }
      const before = this.bytes.subarray(0, start);
      const after = this.bytes.subarray(end);
      this.bytes = new Uint8Array(before.length + newBytes.length + after.length);
      this.bytes.set(before, 0);
      this.bytes.set(newBytes, before.length);
      this.bytes.set(after, before.length + newBytes.length);
      this.view = new DataView(this.bytes.buffer);
    }
    readBytes(length) {
      const slice = this.bytes.subarray(this.pos, this.pos + length);
      this.pos += length;
      return slice;
    }
    readU8() {
      const value = this.view.getUint8(this.pos);
      this.pos += 1;
      return value;
    }
    readU16() {
      const value = this.view.getUint16(this.pos, false);
      this.pos += 2;
      return value;
    }
    readU24() {
      const high = this.view.getUint16(this.pos, false);
      const low = this.view.getUint8(this.pos + 2);
      this.pos += 3;
      return high * 256 + low;
    }
    readU32() {
      const value = this.view.getUint32(this.pos, false);
      this.pos += 4;
      return value;
    }
    readAscii(length) {
      let str = "";
      for (let i = 0; i < length; i++) {
        str += String.fromCharCode(this.view.getUint8(this.pos + i));
      }
      this.pos += length;
      return str;
    }
    readId3V2Frame() {
      if (this.header.majorVersion === 2) {
        const id = this.readAscii(3);
        if (id === "\0\0\0") {
          return null;
        }
        const size = this.readU24();
        return { id, size, flags: 0 };
      } else {
        const id = this.readAscii(4);
        if (id === "\0\0\0\0") {
          return null;
        }
        const sizeRaw = this.readU32();
        let size = this.header.majorVersion === 4 ? decodeSynchsafe(sizeRaw) : sizeRaw;
        const flags = this.readU16();
        const headerEndPos = this.pos;
        const isSizeValid = (size2) => {
          const nextPos = this.pos + size2;
          if (nextPos > this.bytes.length) {
            return false;
          }
          if (nextPos <= this.bytes.length - this.frameHeaderSize()) {
            this.pos += size2;
            const nextId = this.readAscii(4);
            if (nextId !== "\0\0\0\0" && !/[0-9A-Z]{4}/.test(nextId)) {
              return false;
            }
          }
          return true;
        };
        if (!isSizeValid(size)) {
          const otherSize = this.header.majorVersion === 4 ? sizeRaw : decodeSynchsafe(sizeRaw);
          if (isSizeValid(otherSize)) {
            size = otherSize;
          }
        }
        this.pos = headerEndPos;
        return { id, size, flags };
      }
    }
    readId3V2TextEncoding() {
      const number = this.readU8();
      if (number > 3) {
        throw new Error(`Unsupported text encoding: ${number}`);
      }
      return number;
    }
    readId3V2Text(encoding, until) {
      const startPos = this.pos;
      const data = this.readBytes(until - this.pos);
      switch (encoding) {
        case 0 /* ISO_8859_1 */: {
          let str = "";
          for (let i = 0; i < data.length; i++) {
            const value = data[i];
            if (value === 0) {
              this.pos = startPos + i + 1;
              break;
            }
            str += String.fromCharCode(value);
          }
          return str;
        }
        case 1 /* UTF_16_WITH_BOM */: {
          if (data[0] === 255 && data[1] === 254) {
            const decoder = new TextDecoder("utf-16le");
            const endIndex = coalesceIndex(
              data.findIndex((x, i) => x === 0 && data[i + 1] === 0 && i % 2 === 0),
              data.length
            );
            this.pos = startPos + Math.min(endIndex + 2, data.length);
            return decoder.decode(data.subarray(2, endIndex));
          } else if (data[0] === 254 && data[1] === 255) {
            const decoder = new TextDecoder("utf-16be");
            const endIndex = coalesceIndex(
              data.findIndex((x, i) => x === 0 && data[i + 1] === 0 && i % 2 === 0),
              data.length
            );
            this.pos = startPos + Math.min(endIndex + 2, data.length);
            return decoder.decode(data.subarray(2, endIndex));
          } else {
            const endIndex = coalesceIndex(data.findIndex((x) => x === 0), data.length);
            this.pos = startPos + Math.min(endIndex + 1, data.length);
            return textDecoder.decode(data.subarray(0, endIndex));
          }
        }
        case 2 /* UTF_16_BE_NO_BOM */: {
          const decoder = new TextDecoder("utf-16be");
          const endIndex = coalesceIndex(
            data.findIndex((x, i) => x === 0 && data[i + 1] === 0 && i % 2 === 0),
            data.length
          );
          this.pos = startPos + Math.min(endIndex + 2, data.length);
          return decoder.decode(data.subarray(0, endIndex));
        }
        case 3 /* UTF_8 */: {
          const endIndex = coalesceIndex(data.findIndex((x) => x === 0), data.length);
          this.pos = startPos + Math.min(endIndex + 1, data.length);
          return textDecoder.decode(data.subarray(0, endIndex));
        }
      }
    }
    readId3V2EncodingAndText(until) {
      if (this.pos >= until) {
        return "";
      }
      const encoding = this.readId3V2TextEncoding();
      return this.readId3V2Text(encoding, until);
    }
  };
  var Id3V2Writer = class {
    constructor(writer) {
      this.helper = new Uint8Array(8);
      this.helperView = toDataView(this.helper);
      this.writer = writer;
    }
    writeId3V2Tag(metadata) {
      const tagStartPos = this.writer.getPos();
      this.writeAscii("ID3");
      this.writeU8(4);
      this.writeU8(0);
      this.writeU8(0);
      this.writeSynchsafeU32(0);
      const framesStartPos = this.writer.getPos();
      const writtenTags = /* @__PURE__ */ new Set();
      for (const { key, value } of keyValueIterator(metadata)) {
        switch (key) {
          case "title":
            {
              this.writeId3V2TextFrame("TIT2", value);
              writtenTags.add("TIT2");
            }
            ;
            break;
          case "description":
            {
              this.writeId3V2TextFrame("TIT3", value);
              writtenTags.add("TIT3");
            }
            ;
            break;
          case "artist":
            {
              this.writeId3V2TextFrame("TPE1", value);
              writtenTags.add("TPE1");
            }
            ;
            break;
          case "album":
            {
              this.writeId3V2TextFrame("TALB", value);
              writtenTags.add("TALB");
            }
            ;
            break;
          case "albumArtist":
            {
              this.writeId3V2TextFrame("TPE2", value);
              writtenTags.add("TPE2");
            }
            ;
            break;
          case "trackNumber":
            {
              const string = metadata.tracksTotal !== void 0 ? `${value}/${metadata.tracksTotal}` : value.toString();
              this.writeId3V2TextFrame("TRCK", string);
              writtenTags.add("TRCK");
            }
            ;
            break;
          case "discNumber":
            {
              const string = metadata.discsTotal !== void 0 ? `${value}/${metadata.discsTotal}` : value.toString();
              this.writeId3V2TextFrame("TPOS", string);
              writtenTags.add("TPOS");
            }
            ;
            break;
          case "genre":
            {
              this.writeId3V2TextFrame("TCON", value);
              writtenTags.add("TCON");
            }
            ;
            break;
          case "date":
            {
              this.writeId3V2TextFrame("TDRC", value.toISOString().slice(0, 10));
              writtenTags.add("TDRC");
            }
            ;
            break;
          case "lyrics":
            {
              this.writeId3V2LyricsFrame(value);
              writtenTags.add("USLT");
            }
            ;
            break;
          case "comment":
            {
              this.writeId3V2CommentFrame(value);
              writtenTags.add("COMM");
            }
            ;
            break;
          case "images":
            {
              const pictureTypeMap = { coverFront: 3, coverBack: 4, unknown: 0 };
              for (const image of value) {
                const pictureType = pictureTypeMap[image.kind] ?? 0;
                const description = image.description ?? "";
                this.writeId3V2ApicFrame(image.mimeType, pictureType, description, image.data);
              }
            }
            ;
            break;
          case "tracksTotal":
          case "discsTotal":
            {
            }
            ;
            break;
          case "raw":
            {
            }
            ;
            break;
          default: {
            assertNever(key);
          }
        }
      }
      if (metadata.raw) {
        for (const key in metadata.raw) {
          const value = metadata.raw[key];
          if (value == null || key.length !== 4 || writtenTags.has(key)) {
            continue;
          }
          let bytes2;
          if (typeof value === "string") {
            const useIso88591 = isIso88591Compatible(value);
            if (useIso88591) {
              bytes2 = new Uint8Array(value.length + 2);
              bytes2[0] = 0 /* ISO_8859_1 */;
              for (let i = 0; i < value.length; i++) {
                bytes2[i + 1] = value.charCodeAt(i);
              }
            } else {
              const encoded = textEncoder.encode(value);
              bytes2 = new Uint8Array(encoded.byteLength + 2);
              bytes2[0] = 3 /* UTF_8 */;
              bytes2.set(encoded, 1);
            }
          } else if (value instanceof Uint8Array) {
            bytes2 = value;
          } else if (key === "TXXX" && isRecordStringString(value)) {
            for (const description in value) {
              const frameValue = value[description];
              const useIso88591 = isIso88591Compatible(description) && isIso88591Compatible(frameValue);
              const encodedDescription = useIso88591 ? null : textEncoder.encode(description);
              const encodedValue = useIso88591 ? null : textEncoder.encode(frameValue);
              const descriptionDataLength = useIso88591 ? description.length : encodedDescription.byteLength;
              const valueDataLength = useIso88591 ? frameValue.length : encodedValue.byteLength;
              const frameSize = 1 + descriptionDataLength + 1 + valueDataLength + 1;
              this.writeAscii("TXXX");
              this.writeSynchsafeU32(frameSize);
              this.writeU16(0);
              this.writeU8(useIso88591 ? 0 /* ISO_8859_1 */ : 3 /* UTF_8 */);
              if (useIso88591) {
                this.writeIsoString(description);
                this.writeIsoString(frameValue);
              } else {
                this.writer.write(encodedDescription);
                this.writeU8(0);
                this.writer.write(encodedValue);
                this.writeU8(0);
              }
            }
            continue;
          } else {
            continue;
          }
          this.writeAscii(key);
          this.writeSynchsafeU32(bytes2.byteLength);
          this.writeU16(0);
          this.writer.write(bytes2);
        }
      }
      const framesEndPos = this.writer.getPos();
      const framesSize = framesEndPos - framesStartPos;
      this.writer.seek(tagStartPos + 6);
      this.writeSynchsafeU32(framesSize);
      this.writer.seek(framesEndPos);
      return framesSize + 10;
    }
    writeU8(value) {
      this.helper[0] = value;
      this.writer.write(this.helper.subarray(0, 1));
    }
    writeU16(value) {
      this.helperView.setUint16(0, value, false);
      this.writer.write(this.helper.subarray(0, 2));
    }
    writeU32(value) {
      this.helperView.setUint32(0, value, false);
      this.writer.write(this.helper.subarray(0, 4));
    }
    writeAscii(text) {
      for (let i = 0; i < text.length; i++) {
        this.helper[i] = text.charCodeAt(i);
      }
      this.writer.write(this.helper.subarray(0, text.length));
    }
    writeSynchsafeU32(value) {
      this.writeU32(encodeSynchsafe(value));
    }
    writeIsoString(text) {
      const bytes2 = new Uint8Array(text.length + 1);
      for (let i = 0; i < text.length; i++) {
        bytes2[i] = text.charCodeAt(i);
      }
      this.writer.write(bytes2);
    }
    writeUtf8String(text) {
      const utf8Data = textEncoder.encode(text);
      this.writer.write(utf8Data);
      this.writeU8(0);
    }
    writeId3V2TextFrame(frameId, text) {
      const useIso88591 = isIso88591Compatible(text);
      const textDataLength = useIso88591 ? text.length : textEncoder.encode(text).byteLength;
      const frameSize = 1 + textDataLength + 1;
      this.writeAscii(frameId);
      this.writeSynchsafeU32(frameSize);
      this.writeU16(0);
      this.writeU8(useIso88591 ? 0 /* ISO_8859_1 */ : 3 /* UTF_8 */);
      if (useIso88591) {
        this.writeIsoString(text);
      } else {
        this.writeUtf8String(text);
      }
    }
    writeId3V2LyricsFrame(lyrics) {
      const useIso88591 = isIso88591Compatible(lyrics);
      const shortDescription = "";
      const frameSize = 1 + 3 + shortDescription.length + 1 + lyrics.length + 1;
      this.writeAscii("USLT");
      this.writeSynchsafeU32(frameSize);
      this.writeU16(0);
      this.writeU8(useIso88591 ? 0 /* ISO_8859_1 */ : 3 /* UTF_8 */);
      this.writeAscii("und");
      if (useIso88591) {
        this.writeIsoString(shortDescription);
        this.writeIsoString(lyrics);
      } else {
        this.writeUtf8String(shortDescription);
        this.writeUtf8String(lyrics);
      }
    }
    writeId3V2CommentFrame(comment) {
      const useIso88591 = isIso88591Compatible(comment);
      const textDataLength = useIso88591 ? comment.length : textEncoder.encode(comment).byteLength;
      const shortDescription = "";
      const frameSize = 1 + 3 + shortDescription.length + 1 + textDataLength + 1;
      this.writeAscii("COMM");
      this.writeSynchsafeU32(frameSize);
      this.writeU16(0);
      this.writeU8(useIso88591 ? 0 /* ISO_8859_1 */ : 3 /* UTF_8 */);
      this.writeU8(117);
      this.writeU8(110);
      this.writeU8(100);
      if (useIso88591) {
        this.writeIsoString(shortDescription);
        this.writeIsoString(comment);
      } else {
        this.writeUtf8String(shortDescription);
        this.writeUtf8String(comment);
      }
    }
    writeId3V2ApicFrame(mimeType, pictureType, description, imageData) {
      const useIso88591 = isIso88591Compatible(mimeType) && isIso88591Compatible(description);
      const descriptionDataLength = useIso88591 ? description.length : textEncoder.encode(description).byteLength;
      const frameSize = 1 + mimeType.length + 1 + 1 + descriptionDataLength + 1 + imageData.byteLength;
      this.writeAscii("APIC");
      this.writeSynchsafeU32(frameSize);
      this.writeU16(0);
      this.writeU8(useIso88591 ? 0 /* ISO_8859_1 */ : 3 /* UTF_8 */);
      if (useIso88591) {
        this.writeIsoString(mimeType);
      } else {
        this.writeUtf8String(mimeType);
      }
      this.writeU8(pictureType);
      if (useIso88591) {
        this.writeIsoString(description);
      } else {
        this.writeUtf8String(description);
      }
      this.writer.write(imageData);
    }
  };

  // src/muxer.ts
  var Muxer = class {
    constructor(output) {
      this.mutex = new AsyncMutex();
      this.trackTimestampInfo = /* @__PURE__ */ new WeakMap();
      this.output = output;
    }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    onTrackClose(track) {
    }
    validateTimestamp(track, timestampInSeconds, isKeyPacket) {
      if (timestampInSeconds < 0) {
        throw new Error(`Timestamps must be non-negative (got ${timestampInSeconds}s).`);
      }
      let timestampInfo = this.trackTimestampInfo.get(track);
      if (!timestampInfo) {
        if (!isKeyPacket) {
          throw new Error("First packet must be a key packet.");
        }
        timestampInfo = {
          maxTimestamp: timestampInSeconds,
          maxTimestampBeforeLastKeyPacket: null
        };
        this.trackTimestampInfo.set(track, timestampInfo);
      } else {
        if (isKeyPacket) {
          timestampInfo.maxTimestampBeforeLastKeyPacket = timestampInfo.maxTimestamp;
        }
        if (timestampInfo.maxTimestampBeforeLastKeyPacket !== null && timestampInSeconds < timestampInfo.maxTimestampBeforeLastKeyPacket) {
          throw new Error(
            `Timestamps cannot be smaller than the largest timestamp of the previous GOP (a GOP begins with a key packet and ends right before the next key packet). Got ${timestampInSeconds}s, but largest timestamp is ${timestampInfo.maxTimestampBeforeLastKeyPacket}s.`
          );
        }
        timestampInfo.maxTimestamp = Math.max(timestampInfo.maxTimestamp, timestampInSeconds);
      }
    }
  };

  // src/adts/adts-muxer.ts
  var AdtsMuxer = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.header = null;
      this.headerBitstream = null;
      this.inputIsAdts = null;
      this.format = format;
    }
    async start() {
      const release = await this.mutex.acquire();
      this.writer = await this.output._getRootWriter(true);
      if (!metadataTagsAreEmpty(this.output._metadataTags)) {
        const id3Writer = new Id3V2Writer(this.writer);
        id3Writer.writeId3V2Tag(this.output._metadataTags);
      }
      release();
    }
    async getMimeType() {
      return "audio/aac";
    }
    async addEncodedVideoPacket() {
      throw new Error("ADTS does not support video.");
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        this.validateTimestamp(track, packet.timestamp, packet.type === "key");
        if (this.inputIsAdts === null) {
          validateAudioChunkMetadata(meta, track.source._codec);
          const description = meta?.decoderConfig?.description;
          this.inputIsAdts = !description;
          if (!this.inputIsAdts) {
            const config = parseAacAudioSpecificConfig(toUint8Array(description));
            const template = buildAdtsHeaderTemplate(config);
            this.header = template.header;
            this.headerBitstream = template.bitstream;
          }
        }
        if (this.inputIsAdts) {
          const startPos = this.writer.getPos();
          this.writer.write(packet.data);
          if (this.format._options.onFrame) {
            this.format._options.onFrame(packet.data, startPos);
          }
        } else {
          assert(this.header);
          const frameLength = packet.data.byteLength + this.header.byteLength;
          writeAdtsFrameLength(this.headerBitstream, frameLength);
          const startPos = this.writer.getPos();
          this.writer.write(this.header);
          this.writer.write(packet.data);
          if (this.format._options.onFrame) {
            const frameBytes = new Uint8Array(frameLength);
            frameBytes.set(this.header, 0);
            frameBytes.set(packet.data, this.header.byteLength);
            this.format._options.onFrame(frameBytes, startPos);
          }
        }
        await this.writer.flush();
      } finally {
        release();
      }
    }
    async addSubtitleCue() {
      throw new Error("ADTS does not support subtitles.");
    }
    async finalize() {
      const release = await this.mutex.acquire();
      if (this.inputIsAdts === null) {
        throw new Error("Cannot finalize an empty ADTS file: not a single packet was added.");
      }
      release();
    }
  };

  // src/flac/flac-muxer.ts
  var FLAC_HEADER = /* @__PURE__ */ new Uint8Array([102, 76, 97, 67]);
  var STREAMINFO_SIZE = 38;
  var STREAMINFO_BLOCK_SIZE = 34;
  var FlacMuxer = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.metadataWritten = false;
      this.blockSizes = [];
      this.frameSizes = [];
      this.sampleRate = null;
      this.channels = null;
      this.bitsPerSample = null;
      this.format = format;
    }
    async start() {
      const release = await this.mutex.acquire();
      this.writer = await this.output._getRootWriter(!!this.format._options.appendOnly);
      this.writer.write(FLAC_HEADER);
      const track = this.output.tracks[0];
      assert(track?.isAudioTrack());
      if (track.metadata.decoderConfig) {
        validateAudioChunkMetadata({ decoderConfig: track.metadata.decoderConfig }, track.source._codec);
        this.applyDecoderConfig(track.metadata.decoderConfig);
      }
      release();
    }
    applyDecoderConfig(decoderConfig) {
      assert(decoderConfig.description);
      this.sampleRate = decoderConfig.sampleRate;
      this.channels = decoderConfig.numberOfChannels;
      const descriptionBitstream = new Bitstream(
        toUint8Array(decoderConfig.description)
      );
      descriptionBitstream.skipBits(103 + 64);
      this.bitsPerSample = descriptionBitstream.readBits(5) + 1;
      if (this.format._options.appendOnly) {
        this.writeHeader({
          // https://www.rfc-editor.org/rfc/rfc9639.html#name-streaminfo
          // Per RFC 9639, min/max block sizes can be looser than
          // actual values, so we use the full valid range (16–65535).
          // "The actual max block size MAY be smaller than what's
          // listed, and the actual min (excluding last block) MAY be
          // larger. This is because the encoder has to write these
          // fields before receiving any input audio data and cannot
          // know beforehand what block sizes it will use."
          minimumBlockSize: 16,
          maximumBlockSize: 65535,
          // https://www.rfc-editor.org/rfc/rfc9639.html#name-streaminfo
          // "A value of 0 signifies that the value is not known."
          minimumFrameSize: 0,
          maximumFrameSize: 0,
          sampleRate: this.sampleRate,
          channels: this.channels,
          bitsPerSample: this.bitsPerSample,
          totalSamples: 0
        });
      }
    }
    writeHeader({
      bitsPerSample,
      minimumBlockSize,
      maximumBlockSize,
      minimumFrameSize,
      maximumFrameSize,
      sampleRate,
      channels,
      totalSamples
    }) {
      assert(this.writer.getPos() === 4);
      const hasMetadata = !metadataTagsAreEmpty(this.output._metadataTags);
      const headerBitstream = new Bitstream(new Uint8Array(4));
      headerBitstream.writeBits(1, Number(!hasMetadata));
      headerBitstream.writeBits(7, 0 /* STREAMINFO */);
      headerBitstream.writeBits(24, STREAMINFO_BLOCK_SIZE);
      this.writer.write(headerBitstream.bytes);
      const contentBitstream = new Bitstream(new Uint8Array(18));
      contentBitstream.writeBits(16, minimumBlockSize);
      contentBitstream.writeBits(16, maximumBlockSize);
      contentBitstream.writeBits(24, minimumFrameSize);
      contentBitstream.writeBits(24, maximumFrameSize);
      contentBitstream.writeBits(20, sampleRate);
      contentBitstream.writeBits(3, channels - 1);
      contentBitstream.writeBits(5, bitsPerSample - 1);
      if (totalSamples >= 2 ** 32) {
        throw new Error("This muxer only supports writing up to 2 ** 32 samples");
      }
      contentBitstream.writeBits(4, 0);
      contentBitstream.writeBits(32, totalSamples);
      this.writer.write(contentBitstream.bytes);
      this.writer.write(new Uint8Array(16));
    }
    writePictureBlock(picture) {
      const headerSize = 32 + picture.mimeType.length + (picture.description?.length ?? 0) + picture.data.length;
      const header = new Uint8Array(headerSize);
      let offset = 0;
      const dataView = toDataView(header);
      dataView.setUint32(
        offset,
        picture.kind === "coverFront" ? 3 : picture.kind === "coverBack" ? 4 : 0
      );
      offset += 4;
      dataView.setUint32(offset, picture.mimeType.length);
      offset += 4;
      header.set(textEncoder.encode(picture.mimeType), 8);
      offset += picture.mimeType.length;
      dataView.setUint32(offset, picture.description?.length ?? 0);
      offset += 4;
      header.set(textEncoder.encode(picture.description ?? ""), offset);
      offset += picture.description?.length ?? 0;
      offset += 4 + 4 + 4 + 4;
      dataView.setUint32(offset, picture.data.length);
      offset += 4;
      header.set(picture.data, offset);
      offset += picture.data.length;
      assert(offset === headerSize);
      const headerBitstream = new Bitstream(new Uint8Array(4));
      headerBitstream.writeBits(1, 0);
      headerBitstream.writeBits(7, 6 /* PICTURE */);
      headerBitstream.writeBits(24, headerSize);
      this.writer.write(headerBitstream.bytes);
      this.writer.write(header);
    }
    writeVorbisCommentAndPictureBlock() {
      if (!this.format._options.appendOnly) {
        this.writer.seek(STREAMINFO_SIZE + FLAC_HEADER.byteLength);
      }
      if (metadataTagsAreEmpty(this.output._metadataTags)) {
        this.metadataWritten = true;
        return;
      }
      const pictures = this.output._metadataTags.images ?? [];
      for (const picture of pictures) {
        this.writePictureBlock(picture);
      }
      const vorbisComment = createVorbisComments(
        new Uint8Array(0),
        this.output._metadataTags,
        false
      );
      const headerBitstream = new Bitstream(new Uint8Array(4));
      headerBitstream.writeBits(1, 1);
      headerBitstream.writeBits(7, 4 /* VORBIS_COMMENT */);
      headerBitstream.writeBits(24, vorbisComment.length);
      this.writer.write(headerBitstream.bytes);
      this.writer.write(vorbisComment);
      this.metadataWritten = true;
    }
    async getMimeType() {
      return "audio/flac";
    }
    async addEncodedVideoPacket() {
      throw new Error("FLAC does not support video.");
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        this.validateTimestamp(
          track,
          packet.timestamp,
          packet.type === "key"
        );
        if (this.sampleRate === null) {
          validateAudioChunkMetadata(meta, track.source._codec);
          assert(meta);
          assert(meta.decoderConfig);
          this.applyDecoderConfig(meta.decoderConfig);
        }
        if (!this.metadataWritten) {
          this.writeVorbisCommentAndPictureBlock();
        }
        const slice = FileSlice4.tempFromBytes(packet.data);
        slice.skip(2);
        const bytes2 = readBytes(slice, 2);
        const bitstream = new Bitstream(bytes2);
        const blockSizeOrUncommon = getBlockSizeOrUncommon(bitstream.readBits(4));
        if (blockSizeOrUncommon === null) {
          throw new Error("Invalid FLAC frame: Invalid block size.");
        }
        readCodedNumber(slice);
        const blockSize = readBlockSize(slice, blockSizeOrUncommon);
        if (!this.format._options.appendOnly) {
          this.blockSizes.push(blockSize);
          this.frameSizes.push(packet.data.length);
        }
        const startPos = this.writer.getPos();
        this.writer.write(packet.data);
        if (this.format._options.onFrame) {
          this.format._options.onFrame(packet.data, startPos);
        }
        await this.writer.flush();
      } finally {
        release();
      }
    }
    addSubtitleCue() {
      throw new Error("FLAC does not support subtitles.");
    }
    async finalize() {
      const release = await this.mutex.acquire();
      if (this.sampleRate === null) {
        throw new Error(
          "Cannot finalize an empty FLAC file: no packets were added and the track specified no decoderConfig in its metadata, so there's no telling what the file should look like."
        );
      }
      if (!this.metadataWritten) {
        this.writeVorbisCommentAndPictureBlock();
      }
      if (!this.format._options.appendOnly) {
        let minimumBlockSize = Infinity;
        let maximumBlockSize = 0;
        let minimumFrameSize = Infinity;
        let maximumFrameSize = 0;
        let totalSamples = 0;
        for (let i = 0; i < this.blockSizes.length; i++) {
          minimumFrameSize = Math.min(minimumFrameSize, this.frameSizes[i]);
          maximumFrameSize = Math.max(maximumFrameSize, this.frameSizes[i]);
          maximumBlockSize = Math.max(maximumBlockSize, this.blockSizes[i]);
          totalSamples += this.blockSizes[i];
          const isLastFrame = i === this.blockSizes.length - 1;
          if (isLastFrame) {
            continue;
          }
          minimumBlockSize = Math.min(minimumBlockSize, this.blockSizes[i]);
        }
        if (this.blockSizes.length === 0) {
          minimumBlockSize = 16;
          maximumBlockSize = 65535;
          minimumFrameSize = 0;
          maximumFrameSize = 0;
        }
        assert(this.channels !== null);
        assert(this.bitsPerSample !== null);
        this.writer.seek(4);
        this.writeHeader({
          minimumBlockSize,
          maximumBlockSize,
          minimumFrameSize,
          maximumFrameSize,
          sampleRate: this.sampleRate,
          channels: this.channels,
          bitsPerSample: this.bitsPerSample,
          totalSamples
        });
      }
      release();
    }
  };

  // src/subtitles.ts
  var cueBlockHeaderRegex = /(?:(.+?)\n)?((?:\d{2}:)?\d{2}:\d{2}.\d{3})\s+-->\s+((?:\d{2}:)?\d{2}:\d{2}.\d{3})/g;
  var preambleStartRegex = /^WEBVTT(.|\n)*?\n{2}/;
  var inlineTimestampRegex = /<(?:(\d{2}):)?(\d{2}):(\d{2}).(\d{3})>/g;
  var SubtitleParser = class {
    constructor(options) {
      this.preambleText = null;
      this.preambleEmitted = false;
      this.options = options;
    }
    parse(text) {
      text = text.replaceAll("\r\n", "\n").replaceAll("\r", "\n");
      cueBlockHeaderRegex.lastIndex = 0;
      let match;
      if (!this.preambleText) {
        if (!preambleStartRegex.test(text)) {
          throw new Error("WebVTT preamble incorrect.");
        }
        match = cueBlockHeaderRegex.exec(text);
        const preamble = text.slice(0, match?.index ?? text.length).trimEnd();
        if (!preamble) {
          throw new Error("No WebVTT preamble provided.");
        }
        this.preambleText = preamble;
        if (match) {
          text = text.slice(match.index);
          cueBlockHeaderRegex.lastIndex = 0;
        }
      }
      while (match = cueBlockHeaderRegex.exec(text)) {
        const notes = text.slice(0, match.index);
        const cueIdentifier = match[1];
        const matchEnd = match.index + match[0].length;
        const bodyStart = text.indexOf("\n", matchEnd) + 1;
        const cueSettings = text.slice(matchEnd, bodyStart).trim();
        let bodyEnd = text.indexOf("\n\n", matchEnd);
        if (bodyEnd === -1) bodyEnd = text.length;
        const startTime = parseSubtitleTimestamp(match[2]);
        const endTime = parseSubtitleTimestamp(match[3]);
        const duration = endTime - startTime;
        const body = text.slice(bodyStart, bodyEnd).trim();
        text = text.slice(bodyEnd).trimStart();
        cueBlockHeaderRegex.lastIndex = 0;
        const cue = {
          timestamp: startTime / 1e3,
          duration: duration / 1e3,
          text: body,
          identifier: cueIdentifier,
          settings: cueSettings,
          notes
        };
        const meta = {};
        if (!this.preambleEmitted) {
          meta.config = {
            description: this.preambleText
          };
          this.preambleEmitted = true;
        }
        this.options.output(cue, meta);
      }
    }
  };
  var timestampRegex = /(?:(\d{2}):)?(\d{2}):(\d{2}).(\d{3})/;
  var parseSubtitleTimestamp = (string) => {
    const match = timestampRegex.exec(string);
    if (!match) throw new Error("Expected match.");
    return 60 * 60 * 1e3 * Number(match[1] || "0") + 60 * 1e3 * Number(match[2]) + 1e3 * Number(match[3]) + Number(match[4]);
  };
  var formatSubtitleTimestamp = (timestamp) => {
    const hours = Math.floor(timestamp / (60 * 60 * 1e3));
    const minutes = Math.floor(timestamp % (60 * 60 * 1e3) / (60 * 1e3));
    const seconds = Math.floor(timestamp % (60 * 1e3) / 1e3);
    const milliseconds = timestamp % 1e3;
    return hours.toString().padStart(2, "0") + ":" + minutes.toString().padStart(2, "0") + ":" + seconds.toString().padStart(2, "0") + "." + milliseconds.toString().padStart(3, "0");
  };

  // src/isobmff/isobmff-boxes.ts
  var IsobmffBoxWriter = class {
    constructor(writer) {
      this.writer = writer;
      this.helper = new Uint8Array(8);
      this.helperView = new DataView(this.helper.buffer);
      /**
       * Stores the position from the start of the file to where boxes elements have been written. This is used to
       * rewrite/edit elements that were already added before, and to measure sizes of things.
       */
      this.offsets = /* @__PURE__ */ new WeakMap();
    }
    writeU32(value) {
      this.helperView.setUint32(0, value, false);
      this.writer.write(this.helper.subarray(0, 4));
    }
    writeU64(value) {
      this.helperView.setUint32(0, Math.floor(value / 2 ** 32), false);
      this.helperView.setUint32(4, value, false);
      this.writer.write(this.helper.subarray(0, 8));
    }
    writeAscii(text) {
      for (let i = 0; i < text.length; i++) {
        this.helperView.setUint8(i % 8, text.charCodeAt(i));
        if (i % 8 === 7) this.writer.write(this.helper);
      }
      if (text.length % 8 !== 0) {
        this.writer.write(this.helper.subarray(0, text.length % 8));
      }
    }
    writeBox(box2) {
      this.offsets.set(box2, this.writer.getPos());
      if (box2.contents && !box2.children) {
        this.writeBoxHeader(box2, box2.size ?? box2.contents.byteLength + 8);
        this.writer.write(box2.contents);
      } else {
        const startPos = this.writer.getPos();
        this.writeBoxHeader(box2, 0);
        if (box2.contents) this.writer.write(box2.contents);
        if (box2.children) {
          for (const child of box2.children) if (child) this.writeBox(child);
        }
        const endPos = this.writer.getPos();
        const size = box2.size ?? endPos - startPos;
        this.writer.seek(startPos);
        this.writeBoxHeader(box2, size);
        this.writer.seek(endPos);
      }
    }
    writeBoxHeader(box2, size) {
      this.writeU32(box2.largeSize ? 1 : size);
      this.writeAscii(box2.type);
      if (box2.largeSize) this.writeU64(size);
    }
    measureBoxHeader(box2) {
      return 8 + (box2.largeSize ? 8 : 0);
    }
    patchBox(box2) {
      const boxOffset = this.offsets.get(box2);
      assert(boxOffset !== void 0);
      const endPos = this.writer.getPos();
      this.writer.seek(boxOffset);
      this.writeBox(box2);
      this.writer.seek(endPos);
    }
    measureBox(box2) {
      if (box2.contents && !box2.children) {
        const headerSize = this.measureBoxHeader(box2);
        return headerSize + box2.contents.byteLength;
      } else {
        let result = this.measureBoxHeader(box2);
        if (box2.contents) result += box2.contents.byteLength;
        if (box2.children) {
          for (const child of box2.children) if (child) result += this.measureBox(child);
        }
        return result;
      }
    }
  };
  var bytes = /* @__PURE__ */ new Uint8Array(8);
  var view = /* @__PURE__ */ new DataView(bytes.buffer);
  var u8 = (value) => {
    return [(value % 256 + 256) % 256];
  };
  var u16 = (value) => {
    view.setUint16(0, value, false);
    return [bytes[0], bytes[1]];
  };
  var i16 = (value) => {
    view.setInt16(0, value, false);
    return [bytes[0], bytes[1]];
  };
  var u24 = (value) => {
    view.setUint32(0, value, false);
    return [bytes[1], bytes[2], bytes[3]];
  };
  var u32 = (value) => {
    view.setUint32(0, value, false);
    return [bytes[0], bytes[1], bytes[2], bytes[3]];
  };
  var i32 = (value) => {
    view.setInt32(0, value, false);
    return [bytes[0], bytes[1], bytes[2], bytes[3]];
  };
  var u64 = (value) => {
    view.setUint32(0, Math.floor(value / 2 ** 32), false);
    view.setUint32(4, value, false);
    return [bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7]];
  };
  var i64 = (value) => {
    view.setInt32(0, Math.floor(value / 2 ** 32), false);
    view.setUint32(4, value, false);
    return [bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7]];
  };
  var fixed_8_8 = (value) => {
    view.setInt16(0, 2 ** 8 * value, false);
    return [bytes[0], bytes[1]];
  };
  var fixed_16_16 = (value) => {
    view.setInt32(0, 2 ** 16 * value, false);
    return [bytes[0], bytes[1], bytes[2], bytes[3]];
  };
  var fixed_2_30 = (value) => {
    view.setInt32(0, 2 ** 30 * value, false);
    return [bytes[0], bytes[1], bytes[2], bytes[3]];
  };
  var variableUnsignedInt = (value, byteLength) => {
    const bytes2 = [];
    let remaining = value;
    do {
      let byte = remaining & 127;
      remaining >>= 7;
      if (bytes2.length > 0) {
        byte |= 128;
      }
      bytes2.push(byte);
      if (byteLength !== void 0) {
        byteLength--;
      }
    } while (remaining > 0 || byteLength);
    return bytes2.reverse();
  };
  var ascii = (text, nullTerminated = false) => {
    const bytes2 = Array(text.length).fill(null).map((_, i) => text.charCodeAt(i));
    if (nullTerminated) bytes2.push(0);
    return bytes2;
  };
  var rotationMatrix = (rotationInDegrees) => {
    const theta = rotationInDegrees * (Math.PI / 180);
    const cosTheta = Math.round(Math.cos(theta));
    const sinTheta = Math.round(Math.sin(theta));
    return [
      cosTheta,
      sinTheta,
      0,
      -sinTheta,
      cosTheta,
      0,
      0,
      0,
      1
    ];
  };
  var IDENTITY_MATRIX = /* @__PURE__ */ rotationMatrix(0);
  var matrixToBytes = (matrix) => {
    return [
      fixed_16_16(matrix[0]),
      fixed_16_16(matrix[1]),
      fixed_2_30(matrix[2]),
      fixed_16_16(matrix[3]),
      fixed_16_16(matrix[4]),
      fixed_2_30(matrix[5]),
      fixed_16_16(matrix[6]),
      fixed_16_16(matrix[7]),
      fixed_2_30(matrix[8])
    ];
  };
  var box = (type, contents, children) => ({
    type,
    contents: contents && new Uint8Array(contents.flat(10)),
    children
  });
  var fullBox = (type, version, flags, contents, children) => box(
    type,
    [u8(version), u24(flags), contents ?? []],
    children
  );
  var ftyp = (details) => {
    const minorVersion = 512;
    if (details.isQuickTime) {
      return box("ftyp", [
        ascii("qt  "),
        // Major brand
        u32(minorVersion),
        // Minor version
        // Compatible brands
        ascii("qt  ")
      ]);
    }
    if (details.fragmented) {
      if (details.cmaf) {
        return box("ftyp", [
          ascii("iso5"),
          // Major brand
          u32(minorVersion),
          // Minor version
          // Compatible brands
          ascii("iso5"),
          ascii("iso6"),
          ascii("mp41"),
          ascii("cmfc"),
          ascii("dash")
        ]);
      } else {
        return box("ftyp", [
          ascii("iso5"),
          // Major brand
          u32(minorVersion),
          // Minor version
          // Compatible brands
          ascii("iso5"),
          ascii("iso6"),
          ascii("mp41")
        ]);
      }
    }
    return box("ftyp", [
      ascii("isom"),
      // Major brand
      u32(minorVersion),
      // Minor version
      // Compatible brands
      ascii("isom"),
      details.holdsAvc ? ascii("avc1") : [],
      ascii("mp41")
    ]);
  };
  var styp = () => box("styp", [
    ascii("iso5"),
    // Major brand
    u32(0),
    // Minor version
    // Compatible brands
    ascii("iso5"),
    ascii("iso6"),
    ascii("mp41"),
    ascii("cmfc"),
    ascii("dash")
  ]);
  var sidx = (muxer, referencedSize) => {
    let duration = muxer.maxWrittenEndTimestamp - muxer.minWrittenTimestamp;
    if (!Number.isFinite(duration)) {
      duration = 0;
    }
    return fullBox("sidx", 1, 0, [
      u32(1),
      // Reference ID
      u32(GLOBAL_TIMESCALE),
      // Timescale
      u64(intoTimescale(muxer.minWrittenTimestamp, GLOBAL_TIMESCALE)),
      // Earliest presentation time
      u64(0),
      // First offset
      u16(0),
      // Reserved
      u16(1),
      // Reference count
      u32(referencedSize & 2147483647),
      // Reference type (0) + referenced size
      u32(intoTimescale(duration, GLOBAL_TIMESCALE)),
      // Subsegment duration
      u32(0)
      // Starts with SAP + SAP type + SAP delta time (no information provided)
    ]);
  };
  var mdat = (reserveLargeSize) => ({ type: "mdat", largeSize: reserveLargeSize });
  var free = (size) => ({ type: "free", size });
  var moov = (muxer) => {
    return box("moov", void 0, [
      mvhd(muxer.creationTime, muxer.trackDatas),
      ...muxer.trackDatas.map((x) => trak(x, muxer.creationTime)),
      muxer.isFragmented ? mvex(muxer.trackDatas) : null,
      udta(muxer)
    ]);
  };
  var mvhd = (creationTime, trackDatas) => {
    const duration = Math.max(
      0,
      ...trackDatas.map((trackData) => intoTimescale(presentationSpan(trackData), GLOBAL_TIMESCALE) + intoTimescale(trackData.startTimestampOffset ?? 0, GLOBAL_TIMESCALE))
    );
    const nextTrackId = Math.max(0, ...trackDatas.map((x) => x.track.id)) + 1;
    const needsU64 = !isU32(creationTime) || !isU32(duration);
    const u32OrU64 = needsU64 ? u64 : u32;
    return fullBox("mvhd", +needsU64, 0, [
      u32OrU64(creationTime),
      // Creation time
      u32OrU64(creationTime),
      // Modification time
      u32(GLOBAL_TIMESCALE),
      // Timescale
      u32OrU64(duration),
      // Duration
      fixed_16_16(1),
      // Preferred rate
      fixed_8_8(1),
      // Preferred volume
      Array(10).fill(0),
      // Reserved
      matrixToBytes(IDENTITY_MATRIX),
      // Matrix
      Array(24).fill(0),
      // Pre-defined
      u32(nextTrackId)
      // Next track ID
    ]);
  };
  var presentationSpan = (trackData) => {
    if (trackData.samples.length === 0) {
      return 0;
    }
    let minTimestamp = Infinity;
    let maxEndTimestamp = -Infinity;
    for (let i = 0; i < trackData.samples.length; i++) {
      const sample = trackData.samples[i];
      if (sample.timestamp < minTimestamp) {
        minTimestamp = sample.timestamp;
      }
      if (sample.timestamp + sample.duration > maxEndTimestamp) {
        maxEndTimestamp = sample.timestamp + sample.duration;
      }
    }
    if (minTimestamp === Infinity) {
      return 0;
    }
    return maxEndTimestamp - minTimestamp;
  };
  var trak = (trackData, creationTime) => {
    const trackMetadata = getTrackMetadata(trackData);
    const needsEditList = trackData.startTimestampOffset !== null && trackData.startTimestampOffset > 0;
    return box("trak", void 0, [
      tkhd(trackData, creationTime),
      needsEditList ? edts(trackData, trackData.startTimestampOffset) : null,
      mdia(trackData, creationTime),
      trackMetadata.name !== void 0 ? box("udta", void 0, [
        box("name", [
          // VLC (and Mediabunny) also recognize ©nam
          ...textEncoder.encode(trackMetadata.name)
        ])
      ]) : null
    ]);
  };
  var tkhd = (trackData, creationTime) => {
    const durationInGlobalTimescale = intoTimescale(presentationSpan(trackData), GLOBAL_TIMESCALE) + intoTimescale(trackData.startTimestampOffset ?? 0, GLOBAL_TIMESCALE);
    const needsU64 = !isU32(creationTime) || !isU32(durationInGlobalTimescale);
    const u32OrU64 = needsU64 ? u64 : u32;
    let matrix;
    if (trackData.type === "video") {
      const rotation = trackData.track.metadata.rotation;
      matrix = rotationMatrix(rotation ?? 0);
    } else {
      matrix = IDENTITY_MATRIX;
    }
    let flags = 2;
    if (trackData.track.metadata.disposition?.default !== false) {
      flags |= 1;
    }
    const alternateGroup = trackData.type === "video" ? 0 : trackData.type === "audio" ? 1 : trackData.type === "subtitle" ? 2 : assertNever(trackData);
    return fullBox("tkhd", +needsU64, flags, [
      u32OrU64(creationTime),
      // Creation time
      u32OrU64(creationTime),
      // Modification time
      u32(trackData.track.id),
      // Track ID
      u32(0),
      // Reserved
      u32OrU64(durationInGlobalTimescale),
      // Duration
      Array(8).fill(0),
      // Reserved
      u16(0),
      // Layer
      u16(alternateGroup),
      // Alternate group
      fixed_8_8(trackData.type === "audio" ? 1 : 0),
      // Volume
      u16(0),
      // Reserved
      matrixToBytes(matrix),
      // Matrix
      fixed_16_16(trackData.type === "video" ? trackData.info.width : 0),
      // Track width
      fixed_16_16(trackData.type === "video" ? trackData.info.height : 0)
      // Track height
    ]);
  };
  var edts = (trackData, offset) => {
    const startOffset = intoTimescale(offset, GLOBAL_TIMESCALE);
    const mediaDuration = intoTimescale(presentationSpan(trackData), GLOBAL_TIMESCALE);
    const needs64Bits = !isU32(startOffset) || !isU32(mediaDuration);
    const u32OrU64 = needs64Bits ? u64 : u32;
    const i32OrI64 = needs64Bits ? i64 : i32;
    return box("edts", void 0, [
      fullBox("elst", needs64Bits ? 1 : 0, 0, [
        u32(2),
        // Entry count
        // #1
        u32OrU64(startOffset),
        // Segment duration
        i32OrI64(-1),
        // Media time
        fixed_16_16(1),
        // Media rate
        // #2
        u32OrU64(mediaDuration),
        // Segment duration
        i32OrI64(0),
        // Media time
        fixed_16_16(1)
        // Media rate
      ])
    ]);
  };
  var mdia = (trackData, creationTime) => box("mdia", void 0, [
    mdhd(trackData, creationTime),
    hdlr(true, TRACK_TYPE_TO_COMPONENT_SUBTYPE[trackData.type], TRACK_TYPE_TO_HANDLER_NAME[trackData.type]),
    minf(trackData)
  ]);
  var mdhd = (trackData, creationTime) => {
    const localDuration = intoTimescale(
      presentationSpan(trackData),
      trackData.timescale
    );
    const needsU64 = !isU32(creationTime) || !isU32(localDuration);
    const u32OrU64 = needsU64 ? u64 : u32;
    return fullBox("mdhd", +needsU64, 0, [
      u32OrU64(creationTime),
      // Creation time
      u32OrU64(creationTime),
      // Modification time
      u32(trackData.timescale),
      // Timescale
      u32OrU64(localDuration),
      // Duration
      u16(getLanguageCodeInt(trackData.track.metadata.languageCode ?? UNDETERMINED_LANGUAGE)),
      // Language
      u16(0)
      // Quality
    ]);
  };
  var TRACK_TYPE_TO_COMPONENT_SUBTYPE = {
    video: "vide",
    audio: "soun",
    subtitle: "text"
  };
  var TRACK_TYPE_TO_HANDLER_NAME = {
    video: "MediabunnyVideoHandler",
    audio: "MediabunnySoundHandler",
    subtitle: "MediabunnyTextHandler"
  };
  var hdlr = (hasComponentType, handlerType, name, manufacturer = "\0\0\0\0") => fullBox("hdlr", 0, 0, [
    hasComponentType ? ascii("mhlr") : u32(0),
    // Component type
    ascii(handlerType),
    // Component subtype
    ascii(manufacturer),
    // Component manufacturer
    u32(0),
    // Component flags
    u32(0),
    // Component flags mask
    ascii(name, true)
    // Component name
  ]);
  var minf = (trackData) => box("minf", void 0, [
    TRACK_TYPE_TO_HEADER_BOX[trackData.type](),
    dinf(),
    stbl(trackData)
  ]);
  var vmhd = () => fullBox("vmhd", 0, 1, [
    u16(0),
    // Graphics mode
    u16(0),
    // Opcolor R
    u16(0),
    // Opcolor G
    u16(0)
    // Opcolor B
  ]);
  var smhd = () => fullBox("smhd", 0, 0, [
    u16(0),
    // Balance
    u16(0)
    // Reserved
  ]);
  var nmhd = () => fullBox("nmhd", 0, 0);
  var TRACK_TYPE_TO_HEADER_BOX = {
    video: vmhd,
    audio: smhd,
    subtitle: nmhd
  };
  var dinf = () => box("dinf", void 0, [
    dref()
  ]);
  var dref = () => fullBox("dref", 0, 0, [
    u32(1)
    // Entry count
  ], [
    url()
  ]);
  var url = () => fullBox("url ", 0, 1);
  var stbl = (trackData) => {
    const needsCtts = trackData.compositionTimeOffsetTable.length > 1 || trackData.compositionTimeOffsetTable.some((x) => x.sampleCompositionTimeOffset !== 0);
    return box("stbl", void 0, [
      stsd(trackData),
      stts(trackData),
      needsCtts ? ctts(trackData) : null,
      needsCtts ? cslg(trackData) : null,
      stsc(trackData),
      stsz(trackData),
      stco(trackData),
      stss(trackData)
    ]);
  };
  var stsd = (trackData) => {
    let sampleDescription;
    if (trackData.type === "video") {
      sampleDescription = videoSampleDescription(
        videoCodecToBoxName(trackData.track.source._codec, trackData.info.decoderConfig.codec),
        trackData
      );
    } else if (trackData.type === "audio") {
      const boxName = audioCodecToBoxName(trackData.track.source._codec, trackData.muxer.isQuickTime);
      assert(boxName);
      sampleDescription = soundSampleDescription(
        boxName,
        trackData
      );
    } else if (trackData.type === "subtitle") {
      sampleDescription = subtitleSampleDescription(
        SUBTITLE_CODEC_TO_BOX_NAME[trackData.track.source._codec],
        trackData
      );
    }
    assert(sampleDescription);
    return fullBox("stsd", 0, 0, [
      u32(1)
      // Entry count
    ], [
      sampleDescription
    ]);
  };
  var videoSampleDescription = (compressionType, trackData) => box(compressionType, [
    Array(6).fill(0),
    // Reserved
    u16(1),
    // Data reference index
    u16(0),
    // Pre-defined
    u16(0),
    // Reserved
    Array(12).fill(0),
    // Pre-defined
    u16(trackData.info.width),
    // Width
    u16(trackData.info.height),
    // Height
    u32(4718592),
    // Horizontal resolution
    u32(4718592),
    // Vertical resolution
    u32(0),
    // Reserved
    u16(1),
    // Frame count
    // Compressor name
    u8("Mediabunny".length),
    // Weird Pascal-style string
    ascii("Mediabunny"),
    Array(31 - "Mediabunny".length).fill(0),
    u16(trackData.info.hasAlphaChannel ? 32 : 24),
    // Depth
    i16(65535)
    // Pre-defined
  ], [
    VIDEO_CODEC_TO_CONFIGURATION_BOX[trackData.track.source._codec]?.(trackData) ?? null,
    pasp(trackData),
    colorSpaceIsComplete(trackData.info.decoderConfig.colorSpace) ? colr(trackData) : null
  ]);
  var pasp = (trackData) => {
    if (trackData.info.pixelAspectRatio.num === trackData.info.pixelAspectRatio.den) {
      return null;
    }
    return box("pasp", [
      u32(trackData.info.pixelAspectRatio.num),
      u32(trackData.info.pixelAspectRatio.den)
    ]);
  };
  var colr = (trackData) => box("colr", [
    ascii(trackData.muxer.isQuickTime ? "nclc" : "nclx"),
    // Colour type
    u16(COLOR_PRIMARIES_MAP[trackData.info.decoderConfig.colorSpace.primaries]),
    // Colour primaries
    u16(TRANSFER_CHARACTERISTICS_MAP[trackData.info.decoderConfig.colorSpace.transfer]),
    // Transfer characteristics
    u16(MATRIX_COEFFICIENTS_MAP[trackData.info.decoderConfig.colorSpace.matrix]),
    // Matrix coefficients
    trackData.muxer.isQuickTime ? [] : u8((trackData.info.decoderConfig.colorSpace.fullRange ? 1 : 0) << 7)
    // Full range flag
  ]);
  var avcC = (trackData) => trackData.info.decoderConfig && box("avcC", [
    // For AVC, description is an AVCDecoderConfigurationRecord, so nothing else to do here
    ...toUint8Array(trackData.info.decoderConfig.description)
  ]);
  var hvcC = (trackData) => trackData.info.decoderConfig && box("hvcC", [
    // For HEVC, description is an HEVCDecoderConfigurationRecord, so nothing else to do here
    ...toUint8Array(trackData.info.decoderConfig.description)
  ]);
  var vpcC = (trackData) => {
    if (!trackData.info.decoderConfig) {
      return null;
    }
    const decoderConfig = trackData.info.decoderConfig;
    const parts = decoderConfig.codec.split(".");
    const profile = Number(parts[1]);
    const level = Number(parts[2]);
    const bitDepth = Number(parts[3]);
    const chromaSubsampling = parts[4] ? Number(parts[4]) : 1;
    const videoFullRangeFlag = parts[8] ? Number(parts[8]) : Number(decoderConfig.colorSpace?.fullRange ?? 0);
    const thirdByte = (bitDepth << 4) + (chromaSubsampling << 1) + videoFullRangeFlag;
    const colourPrimaries = parts[5] ? Number(parts[5]) : decoderConfig.colorSpace?.primaries ? COLOR_PRIMARIES_MAP[decoderConfig.colorSpace.primaries] : 2;
    const transferCharacteristics = parts[6] ? Number(parts[6]) : decoderConfig.colorSpace?.transfer ? TRANSFER_CHARACTERISTICS_MAP[decoderConfig.colorSpace.transfer] : 2;
    const matrixCoefficients = parts[7] ? Number(parts[7]) : decoderConfig.colorSpace?.matrix ? MATRIX_COEFFICIENTS_MAP[decoderConfig.colorSpace.matrix] : 2;
    return fullBox("vpcC", 1, 0, [
      u8(profile),
      // Profile
      u8(level),
      // Level
      u8(thirdByte),
      // Bit depth, chroma subsampling, full range
      u8(colourPrimaries),
      // Colour primaries
      u8(transferCharacteristics),
      // Transfer characteristics
      u8(matrixCoefficients),
      // Matrix coefficients
      u16(0)
      // Codec initialization data size
    ]);
  };
  var av1C = (trackData) => {
    return box("av1C", generateAv1CodecConfigurationFromCodecString(trackData.info.decoderConfig.codec));
  };
  var soundSampleDescription = (compressionType, trackData) => {
    let version = 0;
    let contents;
    let sampleSizeInBits = 16;
    const isPcmCodec = PCM_AUDIO_CODECS.includes(trackData.track.source._codec);
    if (isPcmCodec) {
      const codec = trackData.track.source._codec;
      const { sampleSize } = parsePcmCodec(codec);
      sampleSizeInBits = 8 * sampleSize;
      if (sampleSizeInBits > 16) {
        version = 1;
      }
    }
    if (trackData.muxer.isQuickTime) {
      version = 1;
    }
    if (version === 0) {
      contents = [
        Array(6).fill(0),
        // Reserved
        u16(1),
        // Data reference index
        u16(version),
        // Version
        u16(0),
        // Revision level
        u32(0),
        // Vendor
        u16(trackData.info.numberOfChannels),
        // Number of channels
        u16(sampleSizeInBits),
        // Sample size (bits)
        u16(0),
        // Compression ID
        u16(0),
        // Packet size
        u16(trackData.info.sampleRate < 2 ** 16 ? trackData.info.sampleRate : 0),
        // Sample rate (upper)
        u16(0)
        // Sample rate (lower)
      ];
    } else {
      const compressionId = isPcmCodec ? 0 : -2;
      contents = [
        Array(6).fill(0),
        // Reserved
        u16(1),
        // Data reference index
        u16(version),
        // Version
        u16(0),
        // Revision level
        u32(0),
        // Vendor
        u16(trackData.info.numberOfChannels),
        // Number of channels
        u16(Math.min(sampleSizeInBits, 16)),
        // Sample size (bits)
        i16(compressionId),
        // Compression ID
        u16(0),
        // Packet size
        u16(trackData.info.sampleRate < 2 ** 16 ? trackData.info.sampleRate : 0),
        // Sample rate (upper)
        u16(0),
        // Sample rate (lower)
        isPcmCodec ? [
          u32(1),
          // Samples per packet (must be 1 for uncompressed formats)
          u32(sampleSizeInBits / 8),
          // Bytes per packet
          u32(trackData.info.numberOfChannels * sampleSizeInBits / 8)
          // Bytes per frame
        ] : [
          u32(0),
          // Samples per packet (don't bother, still works with 0)
          u32(0),
          // Bytes per packet (variable)
          u32(0)
          // Bytes per frame (variable)
        ],
        u32(2)
        // Bytes per sample (constant in FFmpeg)
      ];
    }
    return box(compressionType, contents, [
      audioCodecToConfigurationBox(trackData.track.source._codec, trackData.muxer.isQuickTime)?.(trackData) ?? null
    ]);
  };
  var esds = (trackData) => {
    let objectTypeIndication;
    switch (trackData.track.source._codec) {
      case "aac":
        {
          objectTypeIndication = 64;
        }
        ;
        break;
      case "mp3":
        {
          objectTypeIndication = 107;
        }
        ;
        break;
      case "vorbis":
        {
          objectTypeIndication = 221;
        }
        ;
        break;
      default:
        throw new Error(`Unhandled audio codec: ${trackData.track.source._codec}`);
    }
    let bytes2 = [
      ...u8(objectTypeIndication),
      // Object type indication
      ...u8(21),
      // stream type(6bits)=5 audio, flags(2bits)=1
      ...u24(0),
      // 24bit buffer size
      ...u32(0),
      // max bitrate
      ...u32(0)
      // avg bitrate
    ];
    if (trackData.info.decoderConfig.description) {
      const description = toUint8Array(trackData.info.decoderConfig.description);
      bytes2 = [
        ...bytes2,
        ...u8(5),
        // TAG(5) = DecoderSpecificInfo
        ...variableUnsignedInt(description.byteLength),
        ...description
      ];
    }
    bytes2 = [
      ...u16(1),
      // ES_ID = 1
      ...u8(0),
      // flags etc = 0
      ...u8(4),
      // TAG(4) = ES Descriptor
      ...variableUnsignedInt(bytes2.length),
      ...bytes2,
      ...u8(6),
      // TAG(6)
      ...u8(1),
      // length
      ...u8(2)
      // data
    ];
    bytes2 = [
      ...u8(3),
      // TAG(3) = Object Descriptor
      ...variableUnsignedInt(bytes2.length),
      ...bytes2
    ];
    return fullBox("esds", 0, 0, bytes2);
  };
  var wave = (trackData) => {
    return box("wave", void 0, [
      frma(trackData),
      enda(trackData),
      box("\0\0\0\0")
      // NULL tag at the end
    ]);
  };
  var frma = (trackData) => {
    return box("frma", [
      ascii(audioCodecToBoxName(trackData.track.source._codec, trackData.muxer.isQuickTime))
    ]);
  };
  var enda = (trackData) => {
    const { littleEndian } = parsePcmCodec(trackData.track.source._codec);
    return box("enda", [
      u16(+littleEndian)
    ]);
  };
  var dOps = (trackData) => {
    let outputChannelCount = trackData.info.numberOfChannels;
    let preSkip = 3840;
    let inputSampleRate = trackData.info.sampleRate;
    let outputGain = 0;
    let channelMappingFamily = 0;
    let channelMappingTable = new Uint8Array(0);
    const description = trackData.info.decoderConfig?.description;
    if (description) {
      assert(description.byteLength >= 18);
      const bytes2 = toUint8Array(description);
      const header = parseOpusIdentificationHeader(bytes2);
      outputChannelCount = header.outputChannelCount;
      preSkip = header.preSkip;
      inputSampleRate = header.inputSampleRate;
      outputGain = header.outputGain;
      channelMappingFamily = header.channelMappingFamily;
      if (header.channelMappingTable) {
        channelMappingTable = header.channelMappingTable;
      }
    }
    return box("dOps", [
      u8(0),
      // Version
      u8(outputChannelCount),
      // OutputChannelCount
      u16(preSkip),
      // PreSkip
      u32(inputSampleRate),
      // InputSampleRate
      i16(outputGain),
      // OutputGain
      u8(channelMappingFamily),
      // ChannelMappingFamily
      ...channelMappingTable
    ]);
  };
  var dfLa = (trackData) => {
    const description = trackData.info.decoderConfig?.description;
    assert(description);
    const bytes2 = toUint8Array(description);
    return fullBox("dfLa", 0, 0, [
      ...bytes2.subarray(4)
    ]);
  };
  var pcmC = (trackData) => {
    const { littleEndian, sampleSize } = parsePcmCodec(trackData.track.source._codec);
    const formatFlags = +littleEndian;
    return fullBox("pcmC", 0, 0, [
      u8(formatFlags),
      u8(8 * sampleSize)
    ]);
  };
  var dac3 = (trackData) => {
    assert(trackData.info.primingPacket);
    const frameInfo = parseAc3SyncFrame(trackData.info.primingPacket.data);
    if (!frameInfo) {
      throw new Error(
        "Couldn't extract AC-3 frame info from the audio packet. Ensure the packets contain valid AC-3 sync frames (as specified in ETSI TS 102 366)."
      );
    }
    const bytes2 = new Uint8Array(3);
    const bitstream = new Bitstream(bytes2);
    bitstream.writeBits(2, frameInfo.fscod);
    bitstream.writeBits(5, frameInfo.bsid);
    bitstream.writeBits(3, frameInfo.bsmod);
    bitstream.writeBits(3, frameInfo.acmod);
    bitstream.writeBits(1, frameInfo.lfeon);
    bitstream.writeBits(5, frameInfo.bitRateCode);
    bitstream.writeBits(5, 0);
    return box("dac3", [...bytes2]);
  };
  var dec3 = (trackData) => {
    assert(trackData.info.primingPacket);
    const frameInfo = parseEac3SyncFrame(trackData.info.primingPacket.data);
    if (!frameInfo) {
      throw new Error(
        "Couldn't extract E-AC-3 frame info from the audio packet. Ensure the packets contain valid E-AC-3 sync frames (as specified in ETSI TS 102 366)."
      );
    }
    let totalBits = 16;
    for (const sub of frameInfo.substreams) {
      totalBits += 23;
      if (sub.numDepSub > 0) {
        totalBits += 9;
      } else {
        totalBits += 1;
      }
    }
    const size = Math.ceil(totalBits / 8);
    const bytes2 = new Uint8Array(size);
    const bitstream = new Bitstream(bytes2);
    bitstream.writeBits(13, frameInfo.dataRate);
    bitstream.writeBits(3, frameInfo.substreams.length - 1);
    for (const sub of frameInfo.substreams) {
      bitstream.writeBits(2, sub.fscod);
      bitstream.writeBits(5, sub.bsid);
      bitstream.writeBits(1, 0);
      bitstream.writeBits(1, 0);
      bitstream.writeBits(3, sub.bsmod);
      bitstream.writeBits(3, sub.acmod);
      bitstream.writeBits(1, sub.lfeon);
      bitstream.writeBits(3, 0);
      bitstream.writeBits(4, sub.numDepSub);
      if (sub.numDepSub > 0) {
        bitstream.writeBits(9, sub.chanLoc);
      } else {
        bitstream.writeBits(1, 0);
      }
    }
    return box("dec3", [...bytes2]);
  };
  var subtitleSampleDescription = (compressionType, trackData) => box(compressionType, [
    Array(6).fill(0),
    // Reserved
    u16(1)
    // Data reference index
  ], [
    SUBTITLE_CODEC_TO_CONFIGURATION_BOX[trackData.track.source._codec](trackData)
  ]);
  var vttC = (trackData) => box("vttC", [
    ...textEncoder.encode(trackData.info.config.description)
  ]);
  var stts = (trackData) => {
    return fullBox("stts", 0, 0, [
      u32(trackData.timeToSampleTable.length),
      // Number of entries
      trackData.timeToSampleTable.map((x) => [
        // Time-to-sample table
        u32(x.sampleCount),
        // Sample count
        u32(x.sampleDelta)
        // Sample duration
      ])
    ]);
  };
  var stss = (trackData) => {
    if (trackData.samples.every((x) => x.type === "key")) return null;
    const keySamples = [...trackData.samples.entries()].filter(([, sample]) => sample.type === "key");
    return fullBox("stss", 0, 0, [
      u32(keySamples.length),
      // Number of entries
      keySamples.map(([index]) => u32(index + 1))
      // Sync sample table
    ]);
  };
  var stsc = (trackData) => {
    return fullBox("stsc", 0, 0, [
      u32(trackData.compactlyCodedChunkTable.length),
      // Number of entries
      trackData.compactlyCodedChunkTable.map((x) => [
        // Sample-to-chunk table
        u32(x.firstChunk),
        // First chunk
        u32(x.samplesPerChunk),
        // Samples per chunk
        u32(1)
        // Sample description index
      ])
    ]);
  };
  var stsz = (trackData) => {
    if (trackData.type === "audio" && trackData.info.requiresPcmTransformation) {
      const { sampleSize } = parsePcmCodec(trackData.track.source._codec);
      return fullBox("stsz", 0, 0, [
        u32(sampleSize * trackData.info.numberOfChannels),
        // Sample size
        u32(trackData.samples.reduce((acc, x) => acc + intoTimescale(x.duration, trackData.timescale), 0))
      ]);
    }
    return fullBox("stsz", 0, 0, [
      u32(0),
      // Sample size (0 means non-constant size)
      u32(trackData.samples.length),
      // Number of entries
      trackData.samples.map((x) => u32(x.size))
      // Sample size table
    ]);
  };
  var stco = (trackData) => {
    if (trackData.finalizedChunks.length > 0 && last(trackData.finalizedChunks).offset >= 2 ** 32) {
      return fullBox("co64", 0, 0, [
        u32(trackData.finalizedChunks.length),
        // Number of entries
        trackData.finalizedChunks.map((x) => u64(x.offset))
        // Chunk offset table
      ]);
    }
    return fullBox("stco", 0, 0, [
      u32(trackData.finalizedChunks.length),
      // Number of entries
      trackData.finalizedChunks.map((x) => u32(x.offset))
      // Chunk offset table
    ]);
  };
  var ctts = (trackData) => {
    return fullBox("ctts", 1, 0, [
      u32(trackData.compositionTimeOffsetTable.length),
      // Number of entries
      trackData.compositionTimeOffsetTable.map((x) => [
        // Time-to-sample table
        u32(x.sampleCount),
        // Sample count
        i32(x.sampleCompositionTimeOffset)
        // Sample offset
      ])
    ]);
  };
  var cslg = (trackData) => {
    let leastDecodeToDisplayDelta = Infinity;
    let greatestDecodeToDisplayDelta = -Infinity;
    let compositionStartTime = Infinity;
    let compositionEndTime = -Infinity;
    assert(trackData.compositionTimeOffsetTable.length > 0);
    assert(trackData.samples.length > 0);
    for (let i = 0; i < trackData.compositionTimeOffsetTable.length; i++) {
      const entry = trackData.compositionTimeOffsetTable[i];
      leastDecodeToDisplayDelta = Math.min(leastDecodeToDisplayDelta, entry.sampleCompositionTimeOffset);
      greatestDecodeToDisplayDelta = Math.max(greatestDecodeToDisplayDelta, entry.sampleCompositionTimeOffset);
    }
    for (let i = 0; i < trackData.samples.length; i++) {
      const sample = trackData.samples[i];
      compositionStartTime = Math.min(
        compositionStartTime,
        intoTimescale(sample.timestamp, trackData.timescale)
      );
      compositionEndTime = Math.max(
        compositionEndTime,
        intoTimescale(sample.timestamp + sample.duration, trackData.timescale)
      );
    }
    const compositionToDtsShift = Math.max(-leastDecodeToDisplayDelta, 0);
    if (compositionEndTime >= 2 ** 31) {
      return null;
    }
    return fullBox("cslg", 0, 0, [
      i32(compositionToDtsShift),
      // Composition to DTS shift
      i32(leastDecodeToDisplayDelta),
      // Least decode to display delta
      i32(greatestDecodeToDisplayDelta),
      // Greatest decode to display delta
      i32(compositionStartTime),
      // Composition start time
      i32(compositionEndTime)
      // Composition end time
    ]);
  };
  var mvex = (trackDatas) => {
    return box("mvex", void 0, trackDatas.map(trex));
  };
  var trex = (trackData) => {
    return fullBox("trex", 0, 0, [
      u32(trackData.track.id),
      // Track ID
      u32(1),
      // Default sample description index
      u32(0),
      // Default sample duration
      u32(0),
      // Default sample size
      u32(0)
      // Default sample flags
    ]);
  };
  var moof = (sequenceNumber, trackDatas) => {
    return box("moof", void 0, [
      mfhd(sequenceNumber),
      ...trackDatas.map(traf)
    ]);
  };
  var mfhd = (sequenceNumber) => {
    return fullBox("mfhd", 0, 0, [
      u32(sequenceNumber)
      // Sequence number
    ]);
  };
  var fragmentSampleFlags = (sample) => {
    let byte1 = 0;
    let byte2 = 0;
    const byte3 = 0;
    const byte4 = 0;
    const sampleIsDifferenceSample = sample.type === "delta";
    byte2 |= +sampleIsDifferenceSample;
    if (sampleIsDifferenceSample) {
      byte1 |= 1;
    } else {
      byte1 |= 2;
    }
    return byte1 << 24 | byte2 << 16 | byte3 << 8 | byte4;
  };
  var traf = (trackData) => {
    return box("traf", void 0, [
      tfhd(trackData),
      tfdt(trackData),
      trun(trackData)
    ]);
  };
  var tfhd = (trackData) => {
    assert(trackData.currentChunk);
    let tfFlags = 0;
    tfFlags |= 8;
    tfFlags |= 16;
    tfFlags |= 32;
    tfFlags |= 131072;
    const referenceSample = trackData.currentChunk.samples[1] ?? trackData.currentChunk.samples[0];
    const referenceSampleInfo = {
      duration: referenceSample.timescaleUnitsToNextSample,
      size: referenceSample.size,
      flags: fragmentSampleFlags(referenceSample)
    };
    return fullBox("tfhd", 0, tfFlags, [
      u32(trackData.track.id),
      // Track ID
      u32(referenceSampleInfo.duration),
      // Default sample duration
      u32(referenceSampleInfo.size),
      // Default sample size
      u32(referenceSampleInfo.flags)
      // Default sample flags
    ]);
  };
  var tfdt = (trackData) => {
    assert(trackData.currentChunk);
    return fullBox("tfdt", 1, 0, [
      u64(intoTimescale(trackData.currentChunk.startTimestamp, trackData.timescale))
      // Base Media Decode Time
    ]);
  };
  var trun = (trackData) => {
    assert(trackData.currentChunk);
    const allSampleDurations = trackData.currentChunk.samples.map((x) => x.timescaleUnitsToNextSample);
    const allSampleSizes = trackData.currentChunk.samples.map((x) => x.size);
    const allSampleFlags = trackData.currentChunk.samples.map(fragmentSampleFlags);
    const allSampleCompositionTimeOffsets = trackData.currentChunk.samples.map((x) => intoTimescale(x.timestamp - x.decodeTimestamp, trackData.timescale));
    const uniqueSampleDurations = new Set(allSampleDurations);
    const uniqueSampleSizes = new Set(allSampleSizes);
    const uniqueSampleFlags = new Set(allSampleFlags);
    const uniqueSampleCompositionTimeOffsets = new Set(allSampleCompositionTimeOffsets);
    const firstSampleFlagsPresent = uniqueSampleFlags.size === 2 && allSampleFlags[0] !== allSampleFlags[1];
    const sampleDurationPresent = uniqueSampleDurations.size > 1;
    const sampleSizePresent = uniqueSampleSizes.size > 1;
    const sampleFlagsPresent = !firstSampleFlagsPresent && uniqueSampleFlags.size > 1;
    const sampleCompositionTimeOffsetsPresent = uniqueSampleCompositionTimeOffsets.size > 1 || [...uniqueSampleCompositionTimeOffsets].some((x) => x !== 0);
    let flags = 0;
    flags |= 1;
    flags |= 4 * +firstSampleFlagsPresent;
    flags |= 256 * +sampleDurationPresent;
    flags |= 512 * +sampleSizePresent;
    flags |= 1024 * +sampleFlagsPresent;
    flags |= 2048 * +sampleCompositionTimeOffsetsPresent;
    return fullBox("trun", 1, flags, [
      u32(trackData.currentChunk.samples.length),
      // Sample count
      u32(trackData.currentChunk.offset - trackData.currentChunk.moofOffset || 0),
      // Data offset
      firstSampleFlagsPresent ? u32(allSampleFlags[0]) : [],
      trackData.currentChunk.samples.map((_, i) => [
        sampleDurationPresent ? u32(allSampleDurations[i]) : [],
        // Sample duration
        sampleSizePresent ? u32(allSampleSizes[i]) : [],
        // Sample size
        sampleFlagsPresent ? u32(allSampleFlags[i]) : [],
        // Sample flags
        // Sample composition time offsets
        sampleCompositionTimeOffsetsPresent ? i32(allSampleCompositionTimeOffsets[i]) : []
      ])
    ]);
  };
  var mfra = (trackDatas) => {
    return box("mfra", void 0, [
      ...trackDatas.map(tfra),
      mfro()
    ]);
  };
  var tfra = (trackData) => {
    const version = 1;
    return fullBox("tfra", version, 0, [
      u32(trackData.track.id),
      // Track ID
      u32(63),
      // This specifies that traf number, trun number and sample number are 32-bit ints
      u32(trackData.finalizedChunks.length),
      // Number of entries
      trackData.finalizedChunks.map((chunk) => [
        u64(intoTimescale(chunk.samples[0].timestamp, trackData.timescale)),
        // Time (in presentation time)
        u64(chunk.moofOffset),
        // moof offset
        u32(chunk.trafIndex + 1),
        // traf number
        u32(1),
        // trun number
        u32(1)
        // Sample number
      ])
    ]);
  };
  var mfro = () => {
    return fullBox("mfro", 0, 0, [
      // This value needs to be overwritten manually from the outside, where the actual size of the enclosing mfra box
      // is known
      u32(0)
      // Size
    ]);
  };
  var vtte = () => box("vtte");
  var vttc = (payload, timestamp, identifier, settings, sourceId) => box("vttc", void 0, [
    sourceId !== null ? box("vsid", [i32(sourceId)]) : null,
    identifier !== null ? box("iden", [...textEncoder.encode(identifier)]) : null,
    timestamp !== null ? box("ctim", [...textEncoder.encode(formatSubtitleTimestamp(timestamp))]) : null,
    settings !== null ? box("sttg", [...textEncoder.encode(settings)]) : null,
    box("payl", [...textEncoder.encode(payload)])
  ]);
  var vtta = (notes) => box("vtta", [...textEncoder.encode(notes)]);
  var udta = (muxer) => {
    const boxes = [];
    const metadataFormat = muxer.format._options.metadataFormat ?? "auto";
    const metadataTags = muxer.output._metadataTags;
    if (metadataFormat === "mdir" || metadataFormat === "auto" && !muxer.isQuickTime) {
      const metaBox = metaMdir(metadataTags);
      if (metaBox) boxes.push(metaBox);
    } else if (metadataFormat === "mdta") {
      const metaBox = metaMdta(metadataTags);
      if (metaBox) boxes.push(metaBox);
    } else if (metadataFormat === "udta" || metadataFormat === "auto" && muxer.isQuickTime) {
      addQuickTimeMetadataTagBoxes(boxes, muxer.output._metadataTags);
    }
    if (boxes.length === 0) {
      return null;
    }
    return box("udta", void 0, boxes);
  };
  var addQuickTimeMetadataTagBoxes = (boxes, tags) => {
    for (const { key, value } of keyValueIterator(tags)) {
      switch (key) {
        case "title":
          {
            boxes.push(metadataTagStringBoxShort("\xA9nam", value));
          }
          ;
          break;
        case "description":
          {
            boxes.push(metadataTagStringBoxShort("\xA9des", value));
          }
          ;
          break;
        case "artist":
          {
            boxes.push(metadataTagStringBoxShort("\xA9ART", value));
          }
          ;
          break;
        case "album":
          {
            boxes.push(metadataTagStringBoxShort("\xA9alb", value));
          }
          ;
          break;
        case "albumArtist":
          {
            boxes.push(metadataTagStringBoxShort("albr", value));
          }
          ;
          break;
        case "genre":
          {
            boxes.push(metadataTagStringBoxShort("\xA9gen", value));
          }
          ;
          break;
        case "date":
          {
            boxes.push(metadataTagStringBoxShort("\xA9day", value.toISOString().slice(0, 10)));
          }
          ;
          break;
        case "comment":
          {
            boxes.push(metadataTagStringBoxShort("\xA9cmt", value));
          }
          ;
          break;
        case "lyrics":
          {
            boxes.push(metadataTagStringBoxShort("\xA9lyr", value));
          }
          ;
          break;
        case "raw":
          {
          }
          ;
          break;
        case "discNumber":
        case "discsTotal":
        case "trackNumber":
        case "tracksTotal":
        case "images":
          {
          }
          ;
          break;
        default:
          assertNever(key);
      }
    }
    if (tags.raw) {
      for (const key in tags.raw) {
        const value = tags.raw[key];
        if (value == null || key.length !== 4 || boxes.some((x) => x.type === key)) {
          continue;
        }
        if (typeof value === "string") {
          boxes.push(metadataTagStringBoxShort(key, value));
        } else if (value instanceof Uint8Array) {
          boxes.push(box(key, Array.from(value)));
        }
      }
    }
  };
  var metadataTagStringBoxShort = (name, value) => {
    const encoded = textEncoder.encode(value);
    return box(name, [
      u16(encoded.length),
      u16(getLanguageCodeInt("und")),
      Array.from(encoded)
    ]);
  };
  var DATA_BOX_MIME_TYPE_MAP = {
    "image/jpeg": 13,
    "image/png": 14,
    "image/bmp": 27
  };
  var generateMetadataPairs = (tags, isMdta) => {
    const pairs = [];
    for (const { key, value } of keyValueIterator(tags)) {
      switch (key) {
        case "title":
          {
            pairs.push({ key: isMdta ? "title" : "\xA9nam", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "description":
          {
            pairs.push({ key: isMdta ? "description" : "\xA9des", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "artist":
          {
            pairs.push({ key: isMdta ? "artist" : "\xA9ART", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "album":
          {
            pairs.push({ key: isMdta ? "album" : "\xA9alb", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "albumArtist":
          {
            pairs.push({ key: isMdta ? "album_artist" : "aART", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "comment":
          {
            pairs.push({ key: isMdta ? "comment" : "\xA9cmt", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "genre":
          {
            pairs.push({ key: isMdta ? "genre" : "\xA9gen", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "lyrics":
          {
            pairs.push({ key: isMdta ? "lyrics" : "\xA9lyr", value: dataStringBoxLong(value) });
          }
          ;
          break;
        case "date":
          {
            pairs.push({
              key: isMdta ? "date" : "\xA9day",
              value: dataStringBoxLong(value.toISOString().slice(0, 10))
            });
          }
          ;
          break;
        case "images":
          {
            for (const image of value) {
              if (image.kind !== "coverFront") {
                continue;
              }
              pairs.push({ key: "covr", value: box("data", [
                u32(DATA_BOX_MIME_TYPE_MAP[image.mimeType] ?? 0),
                // Type indicator
                u32(0),
                // Locale indicator
                Array.from(image.data)
                // Kinda slow, hopefully temp
              ]) });
            }
          }
          ;
          break;
        case "trackNumber":
          {
            if (isMdta) {
              const string = tags.tracksTotal !== void 0 ? `${value}/${tags.tracksTotal}` : value.toString();
              pairs.push({ key: "track", value: dataStringBoxLong(string) });
            } else {
              pairs.push({ key: "trkn", value: box("data", [
                u32(0),
                // 8 bytes empty
                u32(0),
                u16(0),
                // Empty
                u16(value),
                u16(tags.tracksTotal ?? 0),
                u16(0)
                // Empty
              ]) });
            }
          }
          ;
          break;
        case "discNumber":
          {
            if (!isMdta) {
              pairs.push({ key: "disc", value: box("data", [
                u32(0),
                // 8 bytes empty
                u32(0),
                u16(0),
                // Empty
                u16(value),
                u16(tags.discsTotal ?? 0),
                u16(0)
                // Empty
              ]) });
            }
          }
          ;
          break;
        case "tracksTotal":
        case "discsTotal":
          {
          }
          ;
          break;
        case "raw":
          {
          }
          ;
          break;
        default:
          assertNever(key);
      }
    }
    if (tags.raw) {
      for (const key in tags.raw) {
        const value = tags.raw[key];
        if (value == null || !isMdta && key.length !== 4 || pairs.some((x) => x.key === key)) {
          continue;
        }
        if (typeof value === "string") {
          pairs.push({ key, value: dataStringBoxLong(value) });
        } else if (value instanceof Uint8Array) {
          pairs.push({ key, value: box("data", [
            u32(0),
            // Type indicator
            u32(0),
            // Locale indicator
            Array.from(value)
          ]) });
        } else if (value instanceof RichImageData) {
          pairs.push({ key, value: box("data", [
            u32(DATA_BOX_MIME_TYPE_MAP[value.mimeType] ?? 0),
            // Type indicator
            u32(0),
            // Locale indicator
            Array.from(value.data)
            // Kinda slow, hopefully temp
          ]) });
        }
      }
    }
    return pairs;
  };
  var metaMdir = (tags) => {
    const pairs = generateMetadataPairs(tags, false);
    if (pairs.length === 0) {
      return null;
    }
    return fullBox("meta", 0, 0, void 0, [
      hdlr(false, "mdir", "", "appl"),
      // mdir handler
      box("ilst", void 0, pairs.map((pair) => box(pair.key, void 0, [pair.value])))
      // Item list without keys box
    ]);
  };
  var metaMdta = (tags) => {
    const pairs = generateMetadataPairs(tags, true);
    if (pairs.length === 0) {
      return null;
    }
    return box("meta", void 0, [
      hdlr(false, "mdta", ""),
      // mdta handler
      fullBox("keys", 0, 0, [
        u32(pairs.length)
      ], pairs.map((pair) => box("mdta", [
        // Hacky since these aren't boxes technically, but if not box why box-shaped?
        ...textEncoder.encode(pair.key)
      ]))),
      box("ilst", void 0, pairs.map((pair, i) => {
        const boxName = String.fromCharCode(...u32(i + 1));
        return box(boxName, void 0, [pair.value]);
      }))
    ]);
  };
  var dataStringBoxLong = (value) => {
    return box("data", [
      u32(1),
      // Type indicator (UTF-8)
      u32(0),
      // Locale indicator
      ...textEncoder.encode(value)
    ]);
  };
  var videoCodecToBoxName = (codec, fullCodecString) => {
    switch (codec) {
      case "avc":
        return fullCodecString.startsWith("avc3") ? "avc3" : "avc1";
      case "hevc":
        return "hvc1";
      case "vp8":
        return "vp08";
      case "vp9":
        return "vp09";
      case "av1":
        return "av01";
      case "prores":
        return fullCodecString;
    }
  };
  var VIDEO_CODEC_TO_CONFIGURATION_BOX = {
    avc: avcC,
    hevc: hvcC,
    vp8: vpcC,
    vp9: vpcC,
    av1: av1C,
    prores: null
  };
  var audioCodecToBoxName = (codec, isQuickTime) => {
    switch (codec) {
      case "aac":
        return "mp4a";
      case "mp3":
        return "mp4a";
      case "opus":
        return "Opus";
      case "vorbis":
        return "mp4a";
      case "flac":
        return "fLaC";
      case "ulaw":
        return "ulaw";
      case "alaw":
        return "alaw";
      case "pcm-u8":
        return "raw ";
      case "pcm-s8":
        return "sowt";
      case "ac3":
        return "ac-3";
      case "eac3":
        return "ec-3";
    }
    if (isQuickTime) {
      switch (codec) {
        case "pcm-s16":
          return "sowt";
        case "pcm-s16be":
          return "twos";
        case "pcm-s24":
          return "in24";
        case "pcm-s24be":
          return "in24";
        case "pcm-s32":
          return "in32";
        case "pcm-s32be":
          return "in32";
        case "pcm-f32":
          return "fl32";
        case "pcm-f32be":
          return "fl32";
        case "pcm-f64":
          return "fl64";
        case "pcm-f64be":
          return "fl64";
      }
    } else {
      switch (codec) {
        case "pcm-s16":
          return "ipcm";
        case "pcm-s16be":
          return "ipcm";
        case "pcm-s24":
          return "ipcm";
        case "pcm-s24be":
          return "ipcm";
        case "pcm-s32":
          return "ipcm";
        case "pcm-s32be":
          return "ipcm";
        case "pcm-f32":
          return "fpcm";
        case "pcm-f32be":
          return "fpcm";
        case "pcm-f64":
          return "fpcm";
        case "pcm-f64be":
          return "fpcm";
      }
    }
  };
  var audioCodecToConfigurationBox = (codec, isQuickTime) => {
    switch (codec) {
      case "aac":
        return esds;
      case "mp3":
        return esds;
      case "opus":
        return dOps;
      case "vorbis":
        return esds;
      case "flac":
        return dfLa;
      case "ac3":
        return dac3;
      case "eac3":
        return dec3;
    }
    if (isQuickTime) {
      switch (codec) {
        case "pcm-s24":
          return wave;
        case "pcm-s24be":
          return wave;
        case "pcm-s32":
          return wave;
        case "pcm-s32be":
          return wave;
        case "pcm-f32":
          return wave;
        case "pcm-f32be":
          return wave;
        case "pcm-f64":
          return wave;
        case "pcm-f64be":
          return wave;
      }
    } else {
      switch (codec) {
        case "pcm-s16":
          return pcmC;
        case "pcm-s16be":
          return pcmC;
        case "pcm-s24":
          return pcmC;
        case "pcm-s24be":
          return pcmC;
        case "pcm-s32":
          return pcmC;
        case "pcm-s32be":
          return pcmC;
        case "pcm-f32":
          return pcmC;
        case "pcm-f32be":
          return pcmC;
        case "pcm-f64":
          return pcmC;
        case "pcm-f64be":
          return pcmC;
      }
    }
    return null;
  };
  var SUBTITLE_CODEC_TO_BOX_NAME = {
    webvtt: "wvtt"
  };
  var SUBTITLE_CODEC_TO_CONFIGURATION_BOX = {
    webvtt: vttC
  };
  var getLanguageCodeInt = (code) => {
    assert(code.length === 3);
    ;
    let language = 0;
    for (let i = 0; i < 3; i++) {
      language <<= 5;
      language += code.charCodeAt(i) - 96;
    }
    return language;
  };

  // src/writer.ts
  var Writer = class {
    constructor(target, isMonotonic) {
      this.finalized = false;
      this.started = false;
      this.pos = 0;
      this.trackedWrites = null;
      this.trackedStart = -1;
      this.trackedEnd = -1;
      if (target._writerAcquired) {
        throw new Error("Can't have multiple Writers for the same Target.");
      }
      this.target = target;
      target._setMonotonicity(isMonotonic);
      target._writerAcquired = true;
    }
    start() {
      assert(!this.started);
      this.target._start();
      this.started = true;
    }
    /** Writes the given data to the target, at the current position. */
    write(data) {
      assert(this.started && !this.finalized);
      this.maybeTrackWrites(data);
      this.target._write(data, this.pos);
      this.pos += data.byteLength;
    }
    /** Sets the current position for future writes to a new one. */
    seek(newPos) {
      this.pos = newPos;
    }
    /** Returns the current position. */
    getPos() {
      return this.pos;
    }
    /** Signals to the writer that it may be time to flush. */
    async flush() {
      assert(this.started && !this.finalized);
      return this.target._flush();
    }
    /** Called after muxing has finished. */
    async finalize() {
      assert(this.started && !this.finalized);
      await this.target._finalize();
      this.finalized = true;
    }
    maybeTrackWrites(data) {
      if (!this.trackedWrites) {
        return;
      }
      let pos = this.getPos();
      if (pos < this.trackedStart) {
        if (pos + data.byteLength <= this.trackedStart) {
          return;
        }
        data = data.subarray(this.trackedStart - pos);
        pos = 0;
      }
      const neededSize = pos + data.byteLength - this.trackedStart;
      let newLength = this.trackedWrites.byteLength;
      while (newLength < neededSize) {
        newLength *= 2;
      }
      if (newLength !== this.trackedWrites.byteLength) {
        const copy = new Uint8Array(newLength);
        copy.set(this.trackedWrites, 0);
        this.trackedWrites = copy;
      }
      this.trackedWrites.set(data, pos - this.trackedStart);
      this.trackedEnd = Math.max(this.trackedEnd, pos + data.byteLength);
    }
    startTrackingWrites() {
      this.trackedWrites = new Uint8Array(2 ** 10);
      this.trackedStart = this.getPos();
      this.trackedEnd = this.trackedStart;
    }
    stopTrackingWrites() {
      if (!this.trackedWrites) {
        throw new Error("Internal error: Can't get tracked writes since nothing was tracked.");
      }
      const slice = this.trackedWrites.subarray(0, this.trackedEnd - this.trackedStart);
      const result = {
        data: slice,
        start: this.trackedStart,
        end: this.trackedEnd
      };
      this.trackedWrites = null;
      return result;
    }
  };

  // src/target.ts
  var nodeAlias2 = __toESM(require_node(), 1);
  var node2 = typeof nodeAlias2 !== "undefined" ? nodeAlias2 : void 0;
  var Target = class extends EventEmitter {
    constructor() {
      super(...arguments);
      /** @internal */
      this._writerAcquired = false;
      /** @internal */
      this._monotonicity = null;
      /**
       * Called each time data is written to the target. Will be called with the byte range into which data was written.
       *
       * Use this callback to track the size of the output file as it grows. But be warned, this function is chatty and
       * gets called *extremely* often.
       *
       * @deprecated Use `target.on('write', ({ start, end }) => ...)` instead.
       */
      this.onwrite = null;
    }
    /** @internal */
    _setMonotonicity(monotonicity) {
      if (this._monotonicity !== false) {
        this._monotonicity = monotonicity;
      } else {
      }
    }
    /** @internal */
    _dispatchWrite(start, end) {
      this.onwrite?.(start, end);
      this._emit("write", { start, end });
    }
    /**
     * Returns a new {@link RangedTarget} that writes data to this target using the given offset.
     *
     * Useful for writing a file into a section of a larger file.
     */
    slice(offset) {
      if (!Number.isInteger(offset) || offset < 0) {
        throw new TypeError("offset must be a non-negative integer.");
      }
      return new RangedTarget(this, offset);
    }
  };
  var ARRAY_BUFFER_INITIAL_SIZE = 2 ** 16;
  var ARRAY_BUFFER_MAX_SIZE = 2 ** 32;
  var BufferTarget = class extends Target {
    /** Creates a new {@link BufferTarget}. The buffer holding the data will be created and managed internally. */
    constructor(options = {}) {
      super();
      /** Stores the final output buffer. Until the output is finalized, this will be `null`. */
      this.buffer = null;
      /** @internal */
      this._maxPos = 0;
      if (!options || typeof options !== "object") {
        throw new TypeError("BufferTarget options, when provided, must be an object.");
      }
      if (options.onFinalize !== void 0 && typeof options.onFinalize !== "function") {
        throw new TypeError("options.onFinalize, when provided, must be a function.");
      }
      this._options = options;
      this._supportsResize = "resize" in new ArrayBuffer(0);
      if (this._supportsResize) {
        try {
          this._buffer = new ArrayBuffer(ARRAY_BUFFER_INITIAL_SIZE, { maxByteLength: ARRAY_BUFFER_MAX_SIZE });
        } catch {
          this._buffer = new ArrayBuffer(ARRAY_BUFFER_INITIAL_SIZE);
          this._supportsResize = false;
        }
      } else {
        this._buffer = new ArrayBuffer(ARRAY_BUFFER_INITIAL_SIZE);
      }
      this._bytes = new Uint8Array(this._buffer);
    }
    /** @internal */
    _ensureSize(size) {
      let newLength = this._buffer.byteLength;
      while (newLength < size) newLength *= 2;
      if (newLength === this._buffer.byteLength) return;
      if (newLength > ARRAY_BUFFER_MAX_SIZE) {
        throw new Error(
          `ArrayBuffer exceeded maximum size of ${ARRAY_BUFFER_MAX_SIZE} bytes. Please consider using another target.`
        );
      }
      if (this._supportsResize) {
        this._buffer.resize(newLength);
      } else {
        const newBuffer = new ArrayBuffer(newLength);
        const newBytes = new Uint8Array(newBuffer);
        newBytes.set(this._bytes, 0);
        this._buffer = newBuffer;
        this._bytes = newBytes;
      }
    }
    /** @internal */
    _start() {
    }
    /** @internal */
    _write(data, pos) {
      this._ensureSize(pos + data.byteLength);
      this._bytes.set(data, pos);
      this._maxPos = Math.max(this._maxPos, pos + data.byteLength);
      this._dispatchWrite(pos, pos + data.byteLength);
    }
    /** @internal */
    async _flush() {
    }
    /** @internal */
    async _finalize() {
      this.buffer = this._buffer.slice(0, this._maxPos);
      if (this._options.onFinalize) {
        await this._options.onFinalize(this.buffer);
      }
      this._emit("finalized");
    }
    /** @internal */
    async _close() {
    }
    /** @internal */
    _getSlice(start, end) {
      return this._bytes.slice(start, end);
    }
  };
  var DEFAULT_CHUNK_SIZE = 2 ** 24;
  var MAX_CHUNKS_AT_ONCE = 2;
  var StreamTarget = class extends Target {
    /** Creates a new {@link StreamTarget} which writes to the specified `writable`. */
    constructor(writable, options = {}) {
      super();
      /** @internal */
      this._sections = [];
      /** @internal */
      this._lastWriteEnd = 0;
      /** @internal */
      this._lastFlushEnd = 0;
      /** @internal */
      this._streamWriter = null;
      /** @internal */
      this._writeError = null;
      /**
       * The data is divided up into fixed-size chunks, whose contents are first filled in RAM and then flushed out.
       * A chunk is flushed if all of its contents have been written.
       */
      /** @internal */
      this._chunks = [];
      if (!(writable instanceof WritableStream)) {
        throw new TypeError("StreamTarget requires a WritableStream instance.");
      }
      if (options != null && typeof options !== "object") {
        throw new TypeError("StreamTarget options, when provided, must be an object.");
      }
      if (options.chunked !== void 0 && typeof options.chunked !== "boolean") {
        throw new TypeError("options.chunked, when provided, must be a boolean.");
      }
      if (options.chunkSize !== void 0 && (!Number.isInteger(options.chunkSize) || options.chunkSize < 1024)) {
        throw new TypeError("options.chunkSize, when provided, must be an integer and not smaller than 1024.");
      }
      this._writable = writable;
      this._options = options;
      this._chunked = options.chunked ?? false;
      this._chunkSize = options.chunkSize ?? DEFAULT_CHUNK_SIZE;
    }
    /** @internal */
    _start() {
      this._streamWriter = this._writable.getWriter();
    }
    /** @internal */
    _write(data, pos) {
      if (pos > this._lastWriteEnd) {
        const paddingBytesNeeded = pos - this._lastWriteEnd;
        this._write(new Uint8Array(paddingBytesNeeded), this._lastWriteEnd);
      }
      this._sections.push({
        data: data.slice(),
        start: pos
      });
      this._lastWriteEnd = Math.max(this._lastWriteEnd, pos + data.byteLength);
      this._dispatchWrite(pos, pos + data.byteLength);
    }
    /** @internal */
    async _flush() {
      if (this._writeError !== null) {
        throw this._writeError;
      }
      assert(this._streamWriter);
      if (this._sections.length === 0) {
        return;
      }
      const chunks = [];
      const sorted = [...this._sections].sort((a, b) => a.start - b.start);
      chunks.push({
        start: sorted[0].start,
        size: sorted[0].data.byteLength
      });
      for (let i = 1; i < sorted.length; i++) {
        const lastChunk = chunks[chunks.length - 1];
        const section = sorted[i];
        if (section.start <= lastChunk.start + lastChunk.size) {
          lastChunk.size = Math.max(lastChunk.size, section.start + section.data.byteLength - lastChunk.start);
        } else {
          chunks.push({
            start: section.start,
            size: section.data.byteLength
          });
        }
      }
      for (const chunk of chunks) {
        chunk.data = new Uint8Array(chunk.size);
        for (const section of this._sections) {
          if (chunk.start <= section.start && section.start < chunk.start + chunk.size) {
            chunk.data.set(section.data, section.start - chunk.start);
          }
        }
        if (this._streamWriter.desiredSize !== null && this._streamWriter.desiredSize <= 0) {
          await this._streamWriter.ready;
        }
        if (this._chunked) {
          this._writeDataIntoChunks(chunk.data, chunk.start);
          this._tryToFlushChunks();
        } else {
          if (this._monotonicity === true && chunk.start !== this._lastFlushEnd) {
            throw new Error("Internal error: Monotonicity violation.");
          }
          void this._streamWriter.write({
            type: "write",
            data: chunk.data,
            position: chunk.start
          }).catch((error) => {
            this._writeError ??= error;
          });
          this._lastFlushEnd = chunk.start + chunk.data.byteLength;
        }
      }
      this._sections.length = 0;
    }
    /** @internal */
    _writeDataIntoChunks(data, position) {
      let chunkIndex = this._chunks.findIndex((x) => x.start <= position && position < x.start + this._chunkSize);
      if (chunkIndex === -1) chunkIndex = this._createChunk(position);
      const chunk = this._chunks[chunkIndex];
      const relativePosition = position - chunk.start;
      const toWrite = data.subarray(0, Math.min(this._chunkSize - relativePosition, data.byteLength));
      chunk.data.set(toWrite, relativePosition);
      const section = {
        start: relativePosition,
        end: relativePosition + toWrite.byteLength
      };
      this._insertSectionIntoChunk(chunk, section);
      if (chunk.written[0].start === 0 && chunk.written[0].end === this._chunkSize) {
        chunk.shouldFlush = true;
      }
      if (this._chunks.length > MAX_CHUNKS_AT_ONCE) {
        for (let i = 0; i < this._chunks.length - 1; i++) {
          this._chunks[i].shouldFlush = true;
        }
        this._tryToFlushChunks();
      }
      if (toWrite.byteLength < data.byteLength) {
        this._writeDataIntoChunks(data.subarray(toWrite.byteLength), position + toWrite.byteLength);
      }
    }
    /** @internal */
    _insertSectionIntoChunk(chunk, section) {
      let low = 0;
      let high = chunk.written.length - 1;
      let index = -1;
      while (low <= high) {
        const mid = Math.floor(low + (high - low + 1) / 2);
        if (chunk.written[mid].start <= section.start) {
          low = mid + 1;
          index = mid;
        } else {
          high = mid - 1;
        }
      }
      chunk.written.splice(index + 1, 0, section);
      if (index === -1 || chunk.written[index].end < section.start) index++;
      while (index < chunk.written.length - 1 && chunk.written[index].end >= chunk.written[index + 1].start) {
        chunk.written[index].end = Math.max(chunk.written[index].end, chunk.written[index + 1].end);
        chunk.written.splice(index + 1, 1);
      }
    }
    /** @internal */
    _createChunk(includesPosition) {
      const start = Math.floor(includesPosition / this._chunkSize) * this._chunkSize;
      const chunk = {
        start,
        data: new Uint8Array(this._chunkSize),
        written: [],
        shouldFlush: false
      };
      this._chunks.push(chunk);
      this._chunks.sort((a, b) => a.start - b.start);
      return this._chunks.indexOf(chunk);
    }
    /** @internal */
    _tryToFlushChunks(force = false) {
      assert(this._streamWriter);
      for (let i = 0; i < this._chunks.length; i++) {
        const chunk = this._chunks[i];
        if (!chunk.shouldFlush && !force) continue;
        for (const section of chunk.written) {
          const position = chunk.start + section.start;
          if (this._monotonicity === true && position !== this._lastFlushEnd) {
            throw new Error("Internal error: Monotonicity violation.");
          }
          const isPartialView = section.start !== 0 || section.end !== chunk.data.byteLength;
          let data;
          if (isPartialView && isWebKit()) {
            data = chunk.data.slice(section.start, section.end);
          } else {
            data = chunk.data.subarray(section.start, section.end);
          }
          void this._streamWriter.write({
            type: "write",
            data,
            position
          }).catch((error) => {
            this._writeError ??= error;
          });
          this._lastFlushEnd = chunk.start + section.end;
        }
        this._chunks.splice(i--, 1);
      }
    }
    /** @internal */
    async _finalize() {
      if (this._chunked) {
        this._tryToFlushChunks(true);
      }
      if (this._writeError !== null) {
        throw this._writeError;
      }
      assert(this._streamWriter);
      await this._streamWriter.ready;
      await this._streamWriter.close();
      this._emit("finalized");
    }
    /** @internal */
    async _close() {
      return this._streamWriter?.close();
    }
  };
  var AppendOnlyStreamTarget = class extends Target {
    constructor(writable) {
      super();
      /** @internal */
      this._writer = null;
      /** @internal */
      this._nextWritePos = 0;
      this._writable = writable;
      this._streamTarget = new StreamTarget(new WritableStream({
        start: () => {
          this._writer = this._writable.getWriter();
        },
        write: (chunk) => {
          if (this._monotonicity !== true) {
            throw new Error(
              "AppendOnlyStreamTarget requires that data be written monotonically (always appended to the end). You must use a format that guarantees this behavior."
            );
          }
          assert(chunk.position === this._nextWritePos);
          this._nextWritePos += chunk.data.byteLength;
          assert(this._writer);
          return this._writer.write(chunk.data);
        },
        close: () => {
          return this._writer?.close();
        }
      }));
    }
    /** @internal */
    _start() {
      this._streamTarget._start();
    }
    /** @internal */
    _write(data, pos) {
      this._streamTarget._write(data, pos);
    }
    /** @internal */
    _flush() {
      return this._streamTarget._flush();
    }
    /** @internal */
    _finalize() {
      return this._streamTarget._finalize();
    }
    /** @internal */
    _close() {
      return this._streamTarget._close();
    }
    /** @internal */
    _setMonotonicity(monotonicity) {
      super._setMonotonicity(monotonicity);
      this._streamTarget._setMonotonicity(monotonicity);
    }
  };
  var FilePathTarget = class extends Target {
    /** Creates a new {@link FilePathTarget} that writes to the file at the specified file path. */
    constructor(filePath, options = {}) {
      if (typeof filePath !== "string") {
        throw new TypeError("filePath must be a string.");
      }
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!node2.fs) {
        throw new Error(
          "FilePathTarget is only available in server-side environments (Node.js, Bun, Deno)."
        );
      }
      super();
      /** @internal */
      this._fileHandle = null;
      const writable = new WritableStream({
        start: async () => {
          this._fileHandle = await node2.fs.open(filePath, "w");
        },
        write: async (chunk) => {
          assert(this._fileHandle);
          await this._fileHandle.write(chunk.data, 0, chunk.data.byteLength, chunk.position);
        },
        close: async () => {
          if (this._fileHandle) {
            await this._fileHandle.close();
            this._fileHandle = null;
          }
        }
      });
      this._streamTarget = new StreamTarget(writable, {
        chunked: true,
        ...options
      });
    }
    /** @internal */
    _start() {
      this._streamTarget._start();
    }
    /** @internal */
    _write(data, pos) {
      this._streamTarget._write(data, pos);
      this._dispatchWrite(pos, pos + data.byteLength);
    }
    /** @internal */
    async _flush() {
      return this._streamTarget._flush();
    }
    /** @internal */
    async _finalize() {
      await this._streamTarget._finalize();
      this._emit("finalized");
    }
    /** @internal */
    async _close() {
      return this._streamTarget._close();
    }
    /** @internal */
    _setMonotonicity(monotonicity) {
      super._setMonotonicity(monotonicity);
      this._streamTarget._setMonotonicity(monotonicity);
    }
  };
  var NullTarget = class extends Target {
    /** @internal */
    _start() {
    }
    /** @internal */
    _write(data, pos) {
      this._dispatchWrite(pos, pos + data.byteLength);
    }
    /** @internal */
    async _flush() {
    }
    /** @internal */
    async _finalize() {
      this._emit("finalized");
    }
    /** @internal */
    async _close() {
    }
  };
  var RangedTarget = class extends Target {
    /** @internal */
    constructor(baseTarget, offset) {
      super();
      this._baseTarget = baseTarget;
      this._offset = offset;
    }
    /** @internal */
    _start() {
    }
    /** @internal */
    _write(data, pos) {
      this._baseTarget._write(data, this._offset + pos);
      this._dispatchWrite(pos, pos + data.byteLength);
    }
    /** @internal */
    _flush() {
      return this._baseTarget._flush();
    }
    /** @internal */
    async _finalize() {
      this._emit("finalized");
    }
    /** @internal */
    async _close() {
    }
    /** @internal */
    _setMonotonicity(monotonicity) {
      super._setMonotonicity(monotonicity);
      this._baseTarget._setMonotonicity(monotonicity);
    }
  };
  var PathedTarget = class {
    /** Creates a new {@link PathedTarget} from a root path and a callback. */
    constructor(rootPath, getTarget) {
      this.rootPath = rootPath;
      this.getTarget = getTarget;
      if (typeof rootPath !== "string") {
        throw new TypeError("rootPath must be a string.");
      }
      if (typeof getTarget !== "function") {
        throw new TypeError("getTarget must be a function.");
      }
    }
  };

  // src/isobmff/isobmff-muxer.ts
  var GLOBAL_TIMESCALE = 57600;
  var TIMESTAMP_OFFSET = 2082844800;
  var getTrackMetadata = (trackData) => {
    const metadata = {};
    const track = trackData.track;
    if (track.metadata.name !== void 0) {
      metadata.name = track.metadata.name;
    }
    return metadata;
  };
  var intoTimescale = (timeInSeconds, timescale, round = true) => {
    const value = timeInSeconds * timescale;
    return round ? Math.round(value) : value;
  };
  var IsobmffMuxer2 = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.writer = null;
      this.boxWriter = null;
      this.initWriter = null;
      this.initBoxWriter = null;
      this.auxTarget = new BufferTarget();
      this.auxWriter = new Writer(this.auxTarget, false);
      this.auxBoxWriter = new IsobmffBoxWriter(this.auxWriter);
      this.mdat = null;
      this.ftypSize = null;
      this.trackDatas = [];
      this.allTracksKnown = promiseWithResolvers();
      this.creationTime = Math.floor(Date.now() / 1e3) + TIMESTAMP_OFFSET;
      this.finalizedChunks = [];
      this.wroteFragmentedHeader = false;
      this.nextFragmentNumber = 1;
      // Only relevant for fragmented files, to make sure new fragments start with the highest timestamp seen so far
      this.maxWrittenTimestamp = -Infinity;
      this.minWrittenTimestamp = Infinity;
      this.maxWrittenEndTimestamp = -Infinity;
      this.segmentHeaderSize = null;
      this.format = format;
      this.formatOptions = { ...format._options };
      this.isQuickTime = format instanceof MovOutputFormat;
      this.isCmaf = format instanceof CmafOutputFormat;
      this.minimumFragmentDuration = this.formatOptions.minimumFragmentDuration ?? (format instanceof CmafOutputFormat ? Infinity : 1);
      this.auxWriter.start();
    }
    async start() {
      const release = await this.mutex.acquire();
      if (!this.isCmaf) {
        this.writer = await this.output._getRootWriter((target) => this.formatOptions.fastStart !== void 0 ? this.formatOptions.fastStart === "fragmented" : target instanceof BufferTarget);
        this.boxWriter = new IsobmffBoxWriter(this.writer);
        this.fastStart = this.formatOptions.fastStart ?? (this.writer.target instanceof BufferTarget ? "in-memory" : false);
        this.isFragmented = this.fastStart === "fragmented";
      } else {
        this.fastStart = "fragmented";
        this.isFragmented = true;
      }
      if (this.isCmaf) {
        if (!this.output._hasInitTarget()) {
          throw new Error(
            `CMAF outputs require the initTarget field in OutputOptions to be set; the init segment will be written to it.`
          );
        }
        const initTarget = await this.output._getInitTarget();
        const initWriter = new Writer(initTarget, true);
        initWriter.start();
        this.initWriter = initWriter;
        this.initBoxWriter = new IsobmffBoxWriter(initWriter);
      }
      const holdsAvc = this.output.tracks.some((x) => x.isVideoTrack() && x.source._codec === "avc");
      {
        const boxWriter = this.initBoxWriter ?? this.boxWriter;
        assert(boxWriter);
        if (this.formatOptions.onFtyp) {
          boxWriter.writer.startTrackingWrites();
        }
        boxWriter.writeBox(ftyp({
          isQuickTime: this.isQuickTime,
          holdsAvc,
          fragmented: this.isFragmented,
          cmaf: this.isCmaf
        }));
        if (this.formatOptions.onFtyp) {
          const { data, start } = boxWriter.writer.stopTrackingWrites();
          this.formatOptions.onFtyp(data, start);
        }
        this.ftypSize = boxWriter.writer.getPos();
        if (this.isCmaf) {
          await this.initWriter.flush();
        }
      }
      if (this.fastStart === "in-memory") {
      } else if (this.fastStart === "reserve") {
        for (const track of this.output.tracks) {
          if (track.metadata.maximumPacketCount === void 0) {
            throw new Error(
              "All tracks must specify maximumPacketCount in their metadata when using fastStart: 'reserve'."
            );
          }
        }
      } else if (this.isFragmented) {
      } else {
        assert(this.writer);
        assert(this.boxWriter);
        if (this.formatOptions.onMdat) {
          this.writer.startTrackingWrites();
        }
        this.mdat = mdat(true);
        this.boxWriter.writeBox(this.mdat);
      }
      await this.writer?.flush();
      for (const track of this.output.tracks) {
        if (track.isVideoTrack() && track.metadata.decoderConfig) {
          this.getVideoTrackData(
            track,
            track.metadata.primingPacket ?? null,
            { decoderConfig: track.metadata.decoderConfig }
          );
        } else if (track.isAudioTrack() && track.metadata.decoderConfig) {
          this.getAudioTrackData(
            track,
            track.metadata.primingPacket ?? null,
            { decoderConfig: track.metadata.decoderConfig }
          );
        }
      }
      release();
    }
    allTracksAreKnown() {
      for (const track of this.output.tracks) {
        if (!track.source._closed && !this.trackDatas.some((x) => x.track === track)) {
          return false;
        }
      }
      return true;
    }
    async getMimeType() {
      await this.allTracksKnown.promise;
      const codecStrings = this.trackDatas.map((trackData) => {
        if (trackData.type === "video") {
          return trackData.info.decoderConfig.codec;
        } else if (trackData.type === "audio") {
          return trackData.info.decoderConfig.codec;
        } else {
          const map = {
            webvtt: "wvtt"
          };
          return map[trackData.track.source._codec];
        }
      });
      return buildIsobmffMimeType({
        isQuickTime: this.isQuickTime,
        hasVideo: this.trackDatas.some((x) => x.type === "video"),
        hasAudio: this.trackDatas.some((x) => x.type === "audio"),
        codecStrings
      });
    }
    getVideoTrackData(track, packet, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateVideoChunkMetadata(meta, track.source._codec);
      assert(meta);
      assert(meta.decoderConfig);
      const decoderConfig = { ...meta.decoderConfig };
      assert(decoderConfig.codedWidth !== void 0);
      assert(decoderConfig.codedHeight !== void 0);
      let requiresAnnexBTransformation = false;
      if (track.source._codec === "avc" && !decoderConfig.description) {
        if (!packet) {
          throw new Error("No AVC description provided; you must therefore provide a priming packet.");
        }
        const decoderConfigurationRecord = extractAvcDecoderConfigurationRecord(packet.data);
        if (!decoderConfigurationRecord) {
          throw new Error(
            "Couldn't extract an AVCDecoderConfigurationRecord from the AVC packet. Make sure the packets are in Annex B format (as specified in ITU-T-REC-H.264) when not providing a description, or provide a description (must be an AVCDecoderConfigurationRecord as specified in ISO 14496-15) and ensure the packets are in AVCC format."
          );
        }
        decoderConfig.description = serializeAvcDecoderConfigurationRecord(decoderConfigurationRecord);
        requiresAnnexBTransformation = true;
      } else if (track.source._codec === "hevc" && !decoderConfig.description) {
        if (!packet) {
          throw new Error("No HEVC description provided; you must therefore provide a priming packet.");
        }
        const decoderConfigurationRecord = extractHevcDecoderConfigurationRecord(packet.data);
        if (!decoderConfigurationRecord) {
          throw new Error(
            "Couldn't extract an HEVCDecoderConfigurationRecord from the HEVC packet. Make sure the packets are in Annex B format (as specified in ITU-T-REC-H.265) when not providing a description, or provide a description (must be an HEVCDecoderConfigurationRecord as specified in ISO 14496-15) and ensure the packets are in HEVC format."
          );
        }
        decoderConfig.description = serializeHevcDecoderConfigurationRecord(decoderConfigurationRecord);
        requiresAnnexBTransformation = true;
      }
      const timescale = computeRationalApproximation(
        1 / (track.metadata.frameRate ?? GLOBAL_TIMESCALE),
        1e6
      ).den;
      const displayAspectWidth = decoderConfig.displayAspectWidth;
      const displayAspectHeight = decoderConfig.displayAspectHeight;
      const pixelAspectRatio = displayAspectWidth === void 0 || displayAspectHeight === void 0 ? { num: 1, den: 1 } : simplifyRational({
        num: displayAspectWidth * decoderConfig.codedHeight,
        den: displayAspectHeight * decoderConfig.codedWidth
      });
      const hasAlphaChannel = decoderConfig.codec === "ap4h" || decoderConfig.codec === "ap4x";
      const newTrackData = {
        muxer: this,
        track,
        type: "video",
        info: {
          width: decoderConfig.codedWidth,
          height: decoderConfig.codedHeight,
          pixelAspectRatio,
          decoderConfig,
          requiresAnnexBTransformation,
          hasAlphaChannel
        },
        timescale,
        samples: [],
        sampleQueue: [],
        timestampProcessingQueue: [],
        timeToSampleTable: [],
        compositionTimeOffsetTable: [],
        lastTimescaleUnits: null,
        lastSample: null,
        startTimestampOffset: null,
        finalizedChunks: [],
        currentChunk: null,
        compactlyCodedChunkTable: [],
        closed: false
      };
      this.trackDatas.push(newTrackData);
      this.trackDatas.sort((a, b) => a.track.id - b.track.id);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    getAudioTrackData(track, packet, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateAudioChunkMetadata(meta, track.source._codec);
      assert(meta);
      assert(meta.decoderConfig);
      const decoderConfig = { ...meta.decoderConfig };
      let requiresAdtsStripping = false;
      if (track.source._codec === "aac" && !decoderConfig.description) {
        if (!packet) {
          throw new Error("No AAC description provided; you must therefore provide a priming packet.");
        }
        const adtsFrame = readAdtsFrameHeader(FileSlice4.tempFromBytes(packet.data));
        if (!adtsFrame) {
          throw new Error(
            "Couldn't parse ADTS header from the AAC packet. Make sure the packets are in ADTS format (as specified in ISO 13818-7) when not providing a description, or provide a description (must be an AudioSpecificConfig as specified in ISO 14496-3) and ensure the packets are raw AAC data."
          );
        }
        const sampleRate = aacFrequencyTable[adtsFrame.samplingFrequencyIndex];
        const numberOfChannels = aacChannelMap[adtsFrame.channelConfiguration];
        if (sampleRate === void 0 || numberOfChannels === void 0) {
          throw new Error("Invalid ADTS frame header.");
        }
        decoderConfig.description = buildAacAudioSpecificConfig({
          objectType: adtsFrame.objectType,
          sampleRate,
          numberOfChannels
        });
        requiresAdtsStripping = true;
      }
      if (track.source._codec === "ac3" || track.source._codec === "eac3") {
        if (!packet) {
          throw new Error("AC-3/E-AC-3 require a priming packet.");
        }
      }
      const newTrackData = {
        muxer: this,
        track,
        type: "audio",
        info: {
          numberOfChannels: meta.decoderConfig.numberOfChannels,
          sampleRate: meta.decoderConfig.sampleRate,
          decoderConfig,
          requiresPcmTransformation: !this.isFragmented && PCM_AUDIO_CODECS.includes(track.source._codec),
          expectedNextPcmPacketTimestamp: null,
          requiresAdtsStripping,
          primingPacket: packet
        },
        timescale: decoderConfig.sampleRate,
        samples: [],
        sampleQueue: [],
        timestampProcessingQueue: [],
        timeToSampleTable: [],
        compositionTimeOffsetTable: [],
        lastTimescaleUnits: null,
        lastSample: null,
        startTimestampOffset: null,
        finalizedChunks: [],
        currentChunk: null,
        compactlyCodedChunkTable: [],
        closed: false
      };
      this.trackDatas.push(newTrackData);
      this.trackDatas.sort((a, b) => a.track.id - b.track.id);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    getSubtitleTrackData(track, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateSubtitleMetadata(meta);
      assert(meta);
      assert(meta.config);
      const newTrackData = {
        muxer: this,
        track,
        type: "subtitle",
        info: {
          config: meta.config
        },
        timescale: 1e3,
        // Reasonable
        samples: [],
        sampleQueue: [],
        timestampProcessingQueue: [],
        timeToSampleTable: [],
        compositionTimeOffsetTable: [],
        lastTimescaleUnits: null,
        lastSample: null,
        startTimestampOffset: null,
        finalizedChunks: [],
        currentChunk: null,
        compactlyCodedChunkTable: [],
        closed: false,
        lastCueEndTimestamp: 0,
        cueQueue: [],
        nextSourceId: 0,
        cueToSourceId: /* @__PURE__ */ new WeakMap()
      };
      this.trackDatas.push(newTrackData);
      this.trackDatas.sort((a, b) => a.track.id - b.track.id);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    async addEncodedVideoPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getVideoTrackData(track, packet, meta);
        let packetData = packet.data;
        if (trackData.info.requiresAnnexBTransformation) {
          const nalUnits = [...iterateNalUnitsInAnnexB(packetData)].map((loc) => packetData.subarray(loc.offset, loc.offset + loc.length));
          if (nalUnits.length === 0) {
            throw new Error(
              "Failed to transform packet data. Make sure all packets are provided in Annex B format, as specified in ITU-T-REC-H.264 and ITU-T-REC-H.265."
            );
          }
          packetData = concatNalUnitsInLengthPrefixed(nalUnits, 4);
        }
        this.validateTimestamp(
          trackData.track,
          packet.timestamp,
          packet.type === "key"
        );
        const internalSample = this.createSampleForTrack(
          trackData,
          packetData,
          packet.timestamp,
          packet.duration,
          packet.type
        );
        await this.registerSample(trackData, internalSample);
      } finally {
        release();
      }
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getAudioTrackData(track, packet, meta);
        let packetData = packet.data;
        if (trackData.info.requiresAdtsStripping) {
          const adtsFrame = readAdtsFrameHeader(FileSlice4.tempFromBytes(packetData));
          if (!adtsFrame) {
            throw new Error("Expected ADTS frame, didn't get one.");
          }
          const headerLength = adtsFrame.crcCheck === null ? MIN_ADTS_FRAME_HEADER_SIZE : MAX_ADTS_FRAME_HEADER_SIZE;
          packetData = packetData.subarray(headerLength);
        }
        this.validateTimestamp(
          trackData.track,
          packet.timestamp,
          packet.type === "key"
        );
        let timestamp = packet.timestamp;
        let duration = packet.duration;
        if (trackData.info.requiresPcmTransformation) {
          const pcmInfo = parsePcmCodec(
            trackData.info.decoderConfig.codec
          );
          const frameSize = pcmInfo.sampleSize * trackData.info.numberOfChannels;
          duration = packetData.byteLength / frameSize / trackData.info.sampleRate;
          if (trackData.info.expectedNextPcmPacketTimestamp !== null) {
            const diff = timestamp - trackData.info.expectedNextPcmPacketTimestamp;
            if (diff < 0.01) {
              timestamp = trackData.info.expectedNextPcmPacketTimestamp;
            } else {
              const paddedDuration = await this.padWithSilence(
                trackData,
                trackData.info.expectedNextPcmPacketTimestamp,
                diff
              );
              timestamp = trackData.info.expectedNextPcmPacketTimestamp + paddedDuration;
            }
          }
          trackData.info.expectedNextPcmPacketTimestamp = timestamp + duration;
        }
        const internalSample = this.createSampleForTrack(
          trackData,
          packetData,
          timestamp,
          duration,
          packet.type
        );
        await this.registerSample(trackData, internalSample);
      } finally {
        release();
      }
    }
    async padWithSilence(trackData, timestamp, duration) {
      const deltaInTimescale = intoTimescale(duration, trackData.timescale);
      duration = deltaInTimescale / trackData.timescale;
      if (deltaInTimescale > 0) {
        const { sampleSize, silentValue } = parsePcmCodec(
          trackData.info.decoderConfig.codec
        );
        const samplesNeeded = deltaInTimescale * trackData.info.numberOfChannels;
        const data = new Uint8Array(sampleSize * samplesNeeded).fill(silentValue);
        const paddingSample = this.createSampleForTrack(
          trackData,
          new Uint8Array(data.buffer),
          timestamp,
          duration,
          "key"
        );
        await this.registerSample(trackData, paddingSample);
      }
      return duration;
    }
    async addSubtitleCue(track, cue, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getSubtitleTrackData(track, meta);
        this.validateTimestamp(trackData.track, cue.timestamp, true);
        if (track.source._codec === "webvtt") {
          trackData.cueQueue.push(cue);
          await this.processWebVTTCues(trackData, cue.timestamp);
        } else {
        }
      } finally {
        release();
      }
    }
    async processWebVTTCues(trackData, until) {
      while (trackData.cueQueue.length > 0) {
        const timestamps = /* @__PURE__ */ new Set([]);
        for (const cue of trackData.cueQueue) {
          assert(cue.timestamp <= until);
          assert(trackData.lastCueEndTimestamp <= cue.timestamp + cue.duration);
          timestamps.add(Math.max(cue.timestamp, trackData.lastCueEndTimestamp));
          timestamps.add(cue.timestamp + cue.duration);
        }
        const sortedTimestamps = [...timestamps].sort((a, b) => a - b);
        const sampleStart = sortedTimestamps[0];
        const sampleEnd = sortedTimestamps[1] ?? sampleStart;
        if (until < sampleEnd) {
          break;
        }
        if (trackData.lastCueEndTimestamp < sampleStart) {
          this.auxWriter.seek(0);
          const box2 = vtte();
          this.auxBoxWriter.writeBox(box2);
          const body2 = this.auxTarget._getSlice(0, this.auxWriter.getPos());
          const sample2 = this.createSampleForTrack(
            trackData,
            body2,
            trackData.lastCueEndTimestamp,
            sampleStart - trackData.lastCueEndTimestamp,
            "key"
          );
          await this.registerSample(trackData, sample2);
          trackData.lastCueEndTimestamp = sampleStart;
        }
        this.auxWriter.seek(0);
        for (let i = 0; i < trackData.cueQueue.length; i++) {
          const cue = trackData.cueQueue[i];
          if (cue.timestamp >= sampleEnd) {
            break;
          }
          inlineTimestampRegex.lastIndex = 0;
          const containsTimestamp = inlineTimestampRegex.test(cue.text);
          const endTimestamp = cue.timestamp + cue.duration;
          let sourceId = trackData.cueToSourceId.get(cue);
          if (sourceId === void 0 && sampleEnd < endTimestamp) {
            sourceId = trackData.nextSourceId++;
            trackData.cueToSourceId.set(cue, sourceId);
          }
          if (cue.notes) {
            const box3 = vtta(cue.notes);
            this.auxBoxWriter.writeBox(box3);
          }
          const box2 = vttc(
            cue.text,
            containsTimestamp ? sampleStart : null,
            cue.identifier ?? null,
            cue.settings ?? null,
            sourceId ?? null
          );
          this.auxBoxWriter.writeBox(box2);
          if (endTimestamp === sampleEnd) {
            trackData.cueQueue.splice(i--, 1);
          }
        }
        const body = this.auxTarget._getSlice(0, this.auxWriter.getPos());
        const sample = this.createSampleForTrack(trackData, body, sampleStart, sampleEnd - sampleStart, "key");
        await this.registerSample(trackData, sample);
        trackData.lastCueEndTimestamp = sampleEnd;
      }
    }
    createSampleForTrack(trackData, data, timestamp, duration, type) {
      const sample = {
        timestamp,
        decodeTimestamp: timestamp,
        // This may be refined later
        duration,
        data,
        size: data.byteLength,
        type,
        timescaleUnitsToNextSample: intoTimescale(duration, trackData.timescale)
        // Will be refined
      };
      return sample;
    }
    processTimestamps(trackData, nextSample) {
      if (trackData.timestampProcessingQueue.length === 0) {
        return;
      }
      if (trackData.type === "audio" && trackData.info.requiresPcmTransformation) {
        if (!this.isFragmented) {
          trackData.startTimestampOffset ??= trackData.timestampProcessingQueue[0].timestamp;
        }
        let totalDuration = 0;
        for (let i = 0; i < trackData.timestampProcessingQueue.length; i++) {
          const sample = trackData.timestampProcessingQueue[i];
          const duration = intoTimescale(sample.duration, trackData.timescale);
          totalDuration += duration;
        }
        if (trackData.timeToSampleTable.length === 0) {
          trackData.timeToSampleTable.push({
            sampleCount: totalDuration,
            sampleDelta: 1
          });
        } else {
          const lastEntry = last(trackData.timeToSampleTable);
          lastEntry.sampleCount += totalDuration;
        }
        trackData.timestampProcessingQueue.length = 0;
        return;
      }
      const sortedTimestamps = trackData.timestampProcessingQueue.map((x) => x.timestamp).sort((a, b) => a - b);
      if (!this.isFragmented) {
        trackData.startTimestampOffset ??= sortedTimestamps[0];
      }
      for (let i = 0; i < trackData.timestampProcessingQueue.length; i++) {
        const sample = trackData.timestampProcessingQueue[i];
        sample.decodeTimestamp = sortedTimestamps[i];
        const sampleCompositionTimeOffset = intoTimescale(sample.timestamp - sample.decodeTimestamp, trackData.timescale);
        const durationInTimescale = intoTimescale(sample.duration, trackData.timescale);
        if (trackData.lastTimescaleUnits !== null) {
          assert(trackData.lastSample);
          const timescaleUnits = intoTimescale(sample.decodeTimestamp, trackData.timescale, false);
          const delta = Math.round(timescaleUnits - trackData.lastTimescaleUnits);
          assert(delta >= 0);
          trackData.lastTimescaleUnits += delta;
          trackData.lastSample.timescaleUnitsToNextSample = delta;
          if (!this.isFragmented) {
            let lastTableEntry = last(trackData.timeToSampleTable);
            assert(lastTableEntry);
            if (lastTableEntry.sampleCount === 1) {
              lastTableEntry.sampleDelta = delta;
              const entryBefore = trackData.timeToSampleTable[trackData.timeToSampleTable.length - 2];
              if (entryBefore && entryBefore.sampleDelta === delta) {
                entryBefore.sampleCount++;
                trackData.timeToSampleTable.pop();
                lastTableEntry = entryBefore;
              }
            } else if (lastTableEntry.sampleDelta !== delta) {
              lastTableEntry.sampleCount--;
              trackData.timeToSampleTable.push(lastTableEntry = {
                sampleCount: 1,
                sampleDelta: delta
              });
            }
            if (lastTableEntry.sampleDelta === durationInTimescale) {
              lastTableEntry.sampleCount++;
            } else {
              trackData.timeToSampleTable.push({
                sampleCount: 1,
                sampleDelta: durationInTimescale
              });
            }
            const lastCompositionTimeOffsetTableEntry = last(trackData.compositionTimeOffsetTable);
            assert(lastCompositionTimeOffsetTableEntry);
            if (lastCompositionTimeOffsetTableEntry.sampleCompositionTimeOffset === sampleCompositionTimeOffset) {
              lastCompositionTimeOffsetTableEntry.sampleCount++;
            } else {
              trackData.compositionTimeOffsetTable.push({
                sampleCount: 1,
                sampleCompositionTimeOffset
              });
            }
          }
        } else {
          trackData.lastTimescaleUnits = intoTimescale(sample.decodeTimestamp, trackData.timescale, false);
          if (!this.isFragmented) {
            trackData.timeToSampleTable.push({
              sampleCount: 1,
              sampleDelta: durationInTimescale
            });
            trackData.compositionTimeOffsetTable.push({
              sampleCount: 1,
              sampleCompositionTimeOffset
            });
          }
        }
        trackData.lastSample = sample;
      }
      trackData.timestampProcessingQueue.length = 0;
      assert(trackData.lastSample);
      assert(trackData.lastTimescaleUnits !== null);
      if (nextSample !== void 0 && trackData.lastSample.timescaleUnitsToNextSample === 0) {
        assert(nextSample.type === "key");
        const timescaleUnits = intoTimescale(nextSample.timestamp, trackData.timescale, false);
        const delta = Math.round(timescaleUnits - trackData.lastTimescaleUnits);
        trackData.lastSample.timescaleUnitsToNextSample = delta;
      }
    }
    async registerSample(trackData, sample) {
      if (sample.type === "key") {
        this.processTimestamps(trackData, sample);
      }
      trackData.timestampProcessingQueue.push(sample);
      if (this.isFragmented) {
        trackData.sampleQueue.push(sample);
        await this.interleaveSamples();
      } else if (this.fastStart === "reserve") {
        await this.registerSampleFastStartReserve(trackData, sample);
      } else {
        await this.addSampleToTrack(trackData, sample);
      }
    }
    async addSampleToTrack(trackData, sample) {
      if (!this.isFragmented) {
        trackData.samples.push(sample);
        if (this.fastStart === "reserve") {
          const maximumPacketCount = trackData.track.metadata.maximumPacketCount;
          assert(maximumPacketCount !== void 0);
          if (trackData.samples.length > maximumPacketCount) {
            throw new Error(
              `Track #${trackData.track.id} has already reached the maximum packet count (${maximumPacketCount}). Either add less packets or increase the maximum packet count.`
            );
          }
        }
      }
      let beginNewChunk = false;
      if (!trackData.currentChunk) {
        beginNewChunk = true;
      } else {
        trackData.currentChunk.startTimestamp = Math.min(
          trackData.currentChunk.startTimestamp,
          sample.timestamp
        );
        const currentChunkDuration = sample.timestamp - trackData.currentChunk.startTimestamp;
        if (this.isFragmented) {
          const keyFrameQueuedEverywhere = this.trackDatas.every((otherTrackData) => {
            if (trackData === otherTrackData) {
              return sample.type === "key";
            }
            const firstQueuedSample = otherTrackData.sampleQueue[0];
            if (firstQueuedSample) {
              return firstQueuedSample.type === "key";
            }
            return otherTrackData.closed;
          });
          if (currentChunkDuration >= this.minimumFragmentDuration && keyFrameQueuedEverywhere && sample.timestamp > this.maxWrittenTimestamp) {
            beginNewChunk = true;
            await this.finalizeFragment();
          }
        } else {
          beginNewChunk = currentChunkDuration >= 0.5;
        }
      }
      if (beginNewChunk) {
        if (trackData.currentChunk) {
          await this.finalizeCurrentChunk(trackData);
        }
        trackData.currentChunk = {
          startTimestamp: sample.timestamp,
          samples: [],
          offset: null,
          moofOffset: null,
          trafIndex: null
        };
      }
      assert(trackData.currentChunk);
      trackData.currentChunk.samples.push(sample);
      if (this.isFragmented) {
        this.maxWrittenTimestamp = Math.max(this.maxWrittenTimestamp, sample.timestamp);
        this.maxWrittenEndTimestamp = Math.max(this.maxWrittenEndTimestamp, sample.timestamp + sample.duration);
        this.minWrittenTimestamp = Math.min(this.minWrittenTimestamp, sample.timestamp);
      }
    }
    async finalizeCurrentChunk(trackData) {
      assert(!this.isFragmented);
      assert(this.writer);
      if (!trackData.currentChunk) return;
      trackData.finalizedChunks.push(trackData.currentChunk);
      this.finalizedChunks.push(trackData.currentChunk);
      let sampleCount = trackData.currentChunk.samples.length;
      if (trackData.type === "audio" && trackData.info.requiresPcmTransformation) {
        sampleCount = trackData.currentChunk.samples.reduce((acc, sample) => acc + intoTimescale(sample.duration, trackData.timescale), 0);
      }
      if (trackData.compactlyCodedChunkTable.length === 0 || last(trackData.compactlyCodedChunkTable).samplesPerChunk !== sampleCount) {
        trackData.compactlyCodedChunkTable.push({
          firstChunk: trackData.finalizedChunks.length,
          // 1-indexed
          samplesPerChunk: sampleCount
        });
      }
      if (this.fastStart === "in-memory") {
        trackData.currentChunk.offset = 0;
        return;
      }
      trackData.currentChunk.offset = this.writer.getPos();
      for (const sample of trackData.currentChunk.samples) {
        assert(sample.data);
        this.writer.write(sample.data);
        sample.data = null;
      }
      await this.writer.flush();
    }
    async interleaveSamples(isFinalCall = false) {
      assert(this.isFragmented);
      if (!isFinalCall && !this.allTracksAreKnown()) {
        return;
      }
      outer:
        while (true) {
          let trackWithMinTimestamp = null;
          let minTimestamp = Infinity;
          for (const trackData of this.trackDatas) {
            if (!isFinalCall && trackData.sampleQueue.length === 0 && !trackData.closed) {
              break outer;
            }
            if (trackData.sampleQueue.length > 0 && trackData.sampleQueue[0].timestamp < minTimestamp) {
              trackWithMinTimestamp = trackData;
              minTimestamp = trackData.sampleQueue[0].timestamp;
            }
          }
          if (!trackWithMinTimestamp) {
            break;
          }
          const sample = trackWithMinTimestamp.sampleQueue.shift();
          await this.addSampleToTrack(trackWithMinTimestamp, sample);
        }
    }
    async finalizeFragment(flushWriter = !this.isCmaf) {
      assert(this.isFragmented);
      if (!this.wroteFragmentedHeader) {
        this.wroteFragmentedHeader = true;
        const boxWriter = this.initBoxWriter ?? this.boxWriter;
        assert(boxWriter);
        if (this.formatOptions.onMoov) {
          boxWriter.writer.startTrackingWrites();
        }
        this.ensureOneEnabledTrack();
        const movieBox = moov(this);
        boxWriter.writeBox(movieBox);
        if (this.formatOptions.onMoov) {
          const { data, start } = boxWriter.writer.stopTrackingWrites();
          this.formatOptions.onMoov(data, start);
        }
        if (this.isCmaf) {
          assert(this.initWriter);
          await this.initWriter.flush();
          await this.initWriter.finalize();
          this.writer = await this.output._getRootWriter(true);
          this.boxWriter = new IsobmffBoxWriter(this.writer);
          const stypSize = this.boxWriter.measureBox(styp());
          const sidxSize = this.boxWriter.measureBox(sidx(this, 0));
          this.segmentHeaderSize = stypSize + sidxSize;
          this.writer.seek(this.segmentHeaderSize);
        }
      }
      assert(this.writer);
      assert(this.boxWriter);
      const tracksInFragment = this.trackDatas.filter((x) => x.currentChunk);
      if (tracksInFragment.length === 0) {
        if (flushWriter) {
          await this.writer.flush();
        }
        return;
      }
      const fragmentNumber = this.nextFragmentNumber++;
      const moofBox = moof(fragmentNumber, tracksInFragment);
      const moofOffset = this.writer.getPos();
      const mdatStartPos = moofOffset + this.boxWriter.measureBox(moofBox);
      let currentPos = mdatStartPos + MIN_BOX_HEADER_SIZE;
      let fragmentStartTimestamp = Infinity;
      for (let i = 0; i < tracksInFragment.length; i++) {
        const trackData = tracksInFragment[i];
        trackData.currentChunk.offset = currentPos;
        trackData.currentChunk.moofOffset = moofOffset;
        trackData.currentChunk.trafIndex = i;
        for (const sample of trackData.currentChunk.samples) {
          currentPos += sample.size;
        }
        fragmentStartTimestamp = Math.min(fragmentStartTimestamp, trackData.currentChunk.startTimestamp);
      }
      const mdatSize = currentPos - mdatStartPos;
      const needsLargeMdatSize = mdatSize >= 2 ** 32;
      if (needsLargeMdatSize) {
        for (const trackData of tracksInFragment) {
          trackData.currentChunk.offset += MAX_BOX_HEADER_SIZE - MIN_BOX_HEADER_SIZE;
        }
      }
      if (this.formatOptions.onMoof) {
        this.writer.startTrackingWrites();
      }
      const newMoofBox = moof(fragmentNumber, tracksInFragment);
      this.boxWriter.writeBox(newMoofBox);
      if (this.formatOptions.onMoof) {
        const { data, start } = this.writer.stopTrackingWrites();
        this.formatOptions.onMoof(data, start, fragmentStartTimestamp);
      }
      assert(this.writer.getPos() === mdatStartPos);
      if (this.formatOptions.onMdat) {
        this.writer.startTrackingWrites();
      }
      const mdatBox = mdat(needsLargeMdatSize);
      mdatBox.size = mdatSize;
      this.boxWriter.writeBox(mdatBox);
      this.writer.seek(mdatStartPos + (needsLargeMdatSize ? MAX_BOX_HEADER_SIZE : MIN_BOX_HEADER_SIZE));
      for (const trackData of tracksInFragment) {
        for (const sample of trackData.currentChunk.samples) {
          this.writer.write(sample.data);
          sample.data = null;
        }
      }
      if (this.formatOptions.onMdat) {
        const { data, start } = this.writer.stopTrackingWrites();
        this.formatOptions.onMdat(data, start);
      }
      for (const trackData of tracksInFragment) {
        trackData.finalizedChunks.push(trackData.currentChunk);
        this.finalizedChunks.push(trackData.currentChunk);
        trackData.currentChunk = null;
      }
      if (flushWriter) {
        await this.writer.flush();
      }
    }
    async registerSampleFastStartReserve(trackData, sample) {
      if (this.allTracksAreKnown()) {
        if (!this.mdat) {
          await this.createFastStartReserveMdat();
        }
        await this.addSampleToTrack(trackData, sample);
      } else {
        trackData.sampleQueue.push(sample);
      }
    }
    async createFastStartReserveMdat() {
      assert(this.writer);
      assert(this.boxWriter);
      this.ensureOneEnabledTrack();
      const moovBox = moov(this);
      const moovSize = this.boxWriter.measureBox(moovBox);
      const reservedSize = moovSize + this.computeSampleTableSizeUpperBound() + 4096;
      assert(this.ftypSize !== null);
      this.writer.seek(this.ftypSize + reservedSize);
      if (this.formatOptions.onMdat) {
        this.writer.startTrackingWrites();
      }
      this.mdat = mdat(true);
      this.boxWriter.writeBox(this.mdat);
      for (const trackData of this.trackDatas) {
        for (const sample of trackData.sampleQueue) {
          await this.addSampleToTrack(trackData, sample);
        }
        trackData.sampleQueue.length = 0;
      }
    }
    computeSampleTableSizeUpperBound() {
      assert(this.fastStart === "reserve");
      let upperBound = 0;
      for (const trackData of this.trackDatas) {
        const n = trackData.track.metadata.maximumPacketCount;
        assert(n !== void 0);
        upperBound += (4 + 4) * Math.ceil(2 / 3 * n);
        upperBound += 4 * n;
        upperBound += (4 + 4) * Math.ceil(2 / 3 * n);
        upperBound += (4 + 4 + 4) * Math.ceil(2 / 3 * n);
        upperBound += 4 * n;
        upperBound += 8 * n;
      }
      return upperBound;
    }
    // eslint-disable-next-line @typescript-eslint/no-misused-promises
    async onTrackClose(track) {
      const release = await this.mutex.acquire();
      const trackData = this.trackDatas.find((x) => x.track === track);
      if (trackData) {
        trackData.closed = true;
        if (trackData.type === "subtitle" && track.source._codec === "webvtt") {
          await this.processWebVTTCues(trackData, Infinity);
        }
        this.processTimestamps(trackData);
      }
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      if (this.isFragmented) {
        await this.interleaveSamples();
      }
      release();
    }
    ensureOneEnabledTrack() {
      for (const type of ["video", "audio", "subtitle"]) {
        const tracks = this.trackDatas.filter((t) => t.type === type);
        if (tracks.length === 0) {
          continue;
        }
        const hasEnabled = tracks.some((t) => t.track.metadata.disposition?.default !== false);
        if (!hasEnabled) {
          const firstTrack = tracks[0];
          firstTrack.track.metadata.disposition = {
            ...firstTrack.track.metadata.disposition,
            default: true
          };
        }
      }
    }
    /** Internal function for external callers who want to full control fragment boundaries. */
    async forceFragmentFinalization() {
      assert(this.isFragmented);
      const release = await this.mutex.acquire();
      try {
        for (const trackData of this.trackDatas) {
          if (trackData.type === "subtitle" && trackData.track.source._codec === "webvtt") {
            await this.processWebVTTCues(trackData, Infinity);
          }
          this.processTimestamps(trackData);
        }
        await this.interleaveSamples(true);
        await this.finalizeFragment();
      } finally {
        release();
      }
    }
    /** Finalizes the file, making it ready for use. Must be called after all video and audio chunks have been added. */
    async finalize() {
      const release = await this.mutex.acquire();
      this.allTracksKnown.resolve();
      this.ensureOneEnabledTrack();
      if (!this.mdat && this.fastStart === "reserve") {
        await this.createFastStartReserveMdat();
      }
      for (const trackData of this.trackDatas) {
        trackData.closed = true;
        if (trackData.type === "subtitle" && trackData.track.source._codec === "webvtt") {
          await this.processWebVTTCues(trackData, Infinity);
        }
        this.processTimestamps(trackData);
      }
      if (this.isFragmented) {
        await this.interleaveSamples(true);
        await this.finalizeFragment(false);
      } else {
        for (const trackData of this.trackDatas) {
          await this.finalizeCurrentChunk(trackData);
          if (trackData.startTimestampOffset !== null) {
            for (let i = 0; i < trackData.samples.length; i++) {
              const sample = trackData.samples[i];
              sample.timestamp -= trackData.startTimestampOffset;
              sample.decodeTimestamp -= trackData.startTimestampOffset;
            }
          }
        }
      }
      assert(this.writer);
      assert(this.boxWriter);
      if (this.fastStart === "in-memory") {
        this.mdat = mdat(false);
        let mdatSize;
        for (let i = 0; i < 2; i++) {
          const movieBox2 = moov(this);
          const movieBoxSize = this.boxWriter.measureBox(movieBox2);
          mdatSize = this.boxWriter.measureBox(this.mdat);
          let currentChunkPos = this.writer.getPos() + movieBoxSize + mdatSize;
          for (const chunk of this.finalizedChunks) {
            chunk.offset = currentChunkPos;
            for (const { data } of chunk.samples) {
              assert(data);
              currentChunkPos += data.byteLength;
              mdatSize += data.byteLength;
            }
          }
          if (currentChunkPos < 2 ** 32) break;
          if (mdatSize >= 2 ** 32) this.mdat.largeSize = true;
        }
        if (this.formatOptions.onMoov) {
          this.writer.startTrackingWrites();
        }
        const movieBox = moov(this);
        this.boxWriter.writeBox(movieBox);
        if (this.formatOptions.onMoov) {
          const { data, start } = this.writer.stopTrackingWrites();
          this.formatOptions.onMoov(data, start);
        }
        if (this.formatOptions.onMdat) {
          this.writer.startTrackingWrites();
        }
        this.mdat.size = mdatSize;
        this.boxWriter.writeBox(this.mdat);
        for (const chunk of this.finalizedChunks) {
          for (const sample of chunk.samples) {
            assert(sample.data);
            this.writer.write(sample.data);
            sample.data = null;
          }
        }
        if (this.formatOptions.onMdat) {
          const { data, start } = this.writer.stopTrackingWrites();
          this.formatOptions.onMdat(data, start);
        }
      } else if (this.isFragmented) {
        if (this.isCmaf) {
          const contentSize = this.segmentHeaderSize !== null ? this.writer.getPos() - this.segmentHeaderSize : 0;
          this.writer.seek(0);
          this.boxWriter.writeBox(styp());
          this.boxWriter.writeBox(sidx(this, contentSize));
        } else {
          const startPos = this.writer.getPos();
          const mfraBox = mfra(this.trackDatas);
          this.boxWriter.writeBox(mfraBox);
          const mfraBoxSize = this.writer.getPos() - startPos;
          this.writer.seek(this.writer.getPos() - 4);
          this.boxWriter.writeU32(mfraBoxSize);
        }
      } else {
        assert(this.mdat);
        const mdatPos = this.boxWriter.offsets.get(this.mdat);
        assert(mdatPos !== void 0);
        const mdatSize = this.writer.getPos() - mdatPos;
        this.mdat.size = mdatSize;
        this.mdat.largeSize = mdatSize >= 2 ** 32;
        this.boxWriter.patchBox(this.mdat);
        if (this.formatOptions.onMdat) {
          const { data, start } = this.writer.stopTrackingWrites();
          this.formatOptions.onMdat(data, start);
        }
        const movieBox = moov(this);
        if (this.fastStart === "reserve") {
          assert(this.ftypSize !== null);
          this.writer.seek(this.ftypSize);
          if (this.formatOptions.onMoov) {
            this.writer.startTrackingWrites();
          }
          this.boxWriter.writeBox(movieBox);
          const remainingSpace = this.boxWriter.offsets.get(this.mdat) - this.writer.getPos();
          this.boxWriter.writeBox(free(remainingSpace));
        } else {
          if (this.formatOptions.onMoov) {
            this.writer.startTrackingWrites();
          }
          this.boxWriter.writeBox(movieBox);
        }
        if (this.formatOptions.onMoov) {
          const { data, start } = this.writer.stopTrackingWrites();
          this.formatOptions.onMoov(data, start);
        }
      }
      release();
    }
  };

  // src/matroska/matroska-muxer.ts
  var MIN_CLUSTER_TIMESTAMP_MS = -(2 ** 15);
  var MAX_CLUSTER_TIMESTAMP_MS = 2 ** 15 - 1;
  var APP_NAME = "Mediabunny";
  var SEGMENT_SIZE_BYTES = 6;
  var CLUSTER_SIZE_BYTES = 5;
  var TRACK_TYPE_MAP = {
    video: 1,
    audio: 2,
    subtitle: 17
  };
  var MatroskaMuxer = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.trackDatas = [];
      this.allTracksKnown = promiseWithResolvers();
      this.segment = null;
      this.segmentInfo = null;
      this.seekHead = null;
      this.tracksElement = null;
      this.tagsElement = null;
      this.attachmentsElement = null;
      this.segmentDuration = null;
      this.cues = null;
      this.currentCluster = null;
      this.currentClusterStartMsTimestamp = null;
      this.currentClusterMaxMsTimestamp = null;
      this.trackDatasInCurrentCluster = /* @__PURE__ */ new Map();
      this.startTimestamp = Infinity;
      this.endTimestamp = -Infinity;
      this.format = format;
    }
    async start() {
      const release = await this.mutex.acquire();
      this.writer = await this.output._getRootWriter(!!this.format._options.appendOnly);
      this.ebmlWriter = new EBMLWriter(this.writer);
      this.writeEBMLHeader();
      this.createSegmentInfo();
      this.createCues();
      await this.writer.flush();
      for (const track of this.output.tracks) {
        if (track.isVideoTrack() && track.metadata.decoderConfig) {
          this.getVideoTrackData(
            track,
            track.metadata.primingPacket ?? null,
            { decoderConfig: track.metadata.decoderConfig }
          );
        } else if (track.isAudioTrack() && track.metadata.decoderConfig) {
          this.getAudioTrackData(
            track,
            track.metadata.primingPacket ?? null,
            { decoderConfig: track.metadata.decoderConfig }
          );
        }
      }
      release();
    }
    writeEBMLHeader() {
      if (this.format._options.onEbmlHeader) {
        this.writer.startTrackingWrites();
      }
      const ebmlHeader = { id: 440786851 /* EBML */, data: [
        { id: 17030 /* EBMLVersion */, data: 1 },
        { id: 17143 /* EBMLReadVersion */, data: 1 },
        { id: 17138 /* EBMLMaxIDLength */, data: 4 },
        { id: 17139 /* EBMLMaxSizeLength */, data: 8 },
        { id: 17026 /* DocType */, data: this.format instanceof WebMOutputFormat ? "webm" : "matroska" },
        { id: 17031 /* DocTypeVersion */, data: 2 },
        { id: 17029 /* DocTypeReadVersion */, data: 2 }
      ] };
      this.ebmlWriter.writeEBML(ebmlHeader);
      if (this.format._options.onEbmlHeader) {
        const { data, start } = this.writer.stopTrackingWrites();
        this.format._options.onEbmlHeader(data, start);
      }
    }
    /**
     * Creates a SeekHead element which is positioned near the start of the file and allows the media player to seek to
     * relevant sections more easily. Since we don't know the positions of those sections yet, we'll set them later.
     */
    maybeCreateSeekHead(writeOffsets) {
      if (this.format._options.appendOnly) {
        return;
      }
      const kaxCues = new Uint8Array([28, 83, 187, 107]);
      const kaxInfo = new Uint8Array([21, 73, 169, 102]);
      const kaxTracks = new Uint8Array([22, 84, 174, 107]);
      const kaxAttachments = new Uint8Array([25, 65, 164, 105]);
      const kaxTags = new Uint8Array([18, 84, 195, 103]);
      const seekHead = { id: 290298740 /* SeekHead */, data: [
        { id: 19899 /* Seek */, data: [
          { id: 21419 /* SeekID */, data: kaxCues },
          {
            id: 21420 /* SeekPosition */,
            size: 5,
            data: writeOffsets ? this.ebmlWriter.offsets.get(this.cues) - this.segmentDataOffset : 0
          }
        ] },
        { id: 19899 /* Seek */, data: [
          { id: 21419 /* SeekID */, data: kaxInfo },
          {
            id: 21420 /* SeekPosition */,
            size: 5,
            data: writeOffsets ? this.ebmlWriter.offsets.get(this.segmentInfo) - this.segmentDataOffset : 0
          }
        ] },
        { id: 19899 /* Seek */, data: [
          { id: 21419 /* SeekID */, data: kaxTracks },
          {
            id: 21420 /* SeekPosition */,
            size: 5,
            data: writeOffsets ? this.ebmlWriter.offsets.get(this.tracksElement) - this.segmentDataOffset : 0
          }
        ] },
        this.attachmentsElement ? { id: 19899 /* Seek */, data: [
          { id: 21419 /* SeekID */, data: kaxAttachments },
          {
            id: 21420 /* SeekPosition */,
            size: 5,
            data: writeOffsets ? this.ebmlWriter.offsets.get(this.attachmentsElement) - this.segmentDataOffset : 0
          }
        ] } : null,
        this.tagsElement ? { id: 19899 /* Seek */, data: [
          { id: 21419 /* SeekID */, data: kaxTags },
          {
            id: 21420 /* SeekPosition */,
            size: 5,
            data: writeOffsets ? this.ebmlWriter.offsets.get(this.tagsElement) - this.segmentDataOffset : 0
          }
        ] } : null
      ] };
      this.seekHead = seekHead;
    }
    createSegmentInfo() {
      const segmentDuration = { id: 17545 /* Duration */, data: new EBMLFloat64(0) };
      this.segmentDuration = segmentDuration;
      const segmentInfo = { id: 357149030 /* Info */, data: [
        { id: 2807729 /* TimestampScale */, data: 1e6 },
        { id: 19840 /* MuxingApp */, data: APP_NAME },
        { id: 22337 /* WritingApp */, data: APP_NAME },
        !this.format._options.appendOnly ? segmentDuration : null
      ] };
      this.segmentInfo = segmentInfo;
    }
    createTracks() {
      const tracksElement = { id: 374648427 /* Tracks */, data: [] };
      this.tracksElement = tracksElement;
      for (const trackData of this.trackDatas) {
        const codecId = CODEC_STRING_MAP[trackData.track.source._codec];
        assert(codecId);
        let seekPreRollNs = 0;
        if (trackData.type === "audio" && trackData.track.source._codec === "opus") {
          seekPreRollNs = 1e6 * 80;
          const description = trackData.info.decoderConfig.description;
          if (description) {
            const bytes2 = toUint8Array(description);
            const header = parseOpusIdentificationHeader(bytes2);
            seekPreRollNs = Math.round(1e9 * (header.preSkip / OPUS_SAMPLE_RATE));
          }
        }
        tracksElement.data.push({ id: 174 /* TrackEntry */, data: [
          { id: 215 /* TrackNumber */, data: trackData.track.id },
          { id: 29637 /* TrackUID */, data: trackData.track.id },
          { id: 131 /* TrackType */, data: TRACK_TYPE_MAP[trackData.type] },
          trackData.track.metadata.disposition?.default === false ? { id: 136 /* FlagDefault */, data: 0 } : null,
          trackData.track.metadata.disposition?.forced ? { id: 21930 /* FlagForced */, data: 1 } : null,
          trackData.track.metadata.disposition?.hearingImpaired ? { id: 21931 /* FlagHearingImpaired */, data: 1 } : null,
          trackData.track.metadata.disposition?.visuallyImpaired ? { id: 21932 /* FlagVisualImpaired */, data: 1 } : null,
          trackData.track.metadata.disposition?.original ? { id: 21934 /* FlagOriginal */, data: 1 } : null,
          trackData.track.metadata.disposition?.commentary ? { id: 21935 /* FlagCommentary */, data: 1 } : null,
          { id: 156 /* FlagLacing */, data: 0 },
          { id: 2274716 /* Language */, data: trackData.track.metadata.languageCode ?? UNDETERMINED_LANGUAGE },
          { id: 134 /* CodecID */, data: codecId },
          trackData.codecPrivate ? { id: 25506 /* CodecPrivate */, data: toUint8Array(trackData.codecPrivate) } : null,
          { id: 22186 /* CodecDelay */, data: 0 },
          { id: 22203 /* SeekPreRoll */, data: seekPreRollNs },
          trackData.track.metadata.name !== void 0 ? { id: 21358 /* Name */, data: new EBMLUnicodeString(trackData.track.metadata.name) } : null,
          trackData.type === "video" ? this.videoSpecificTrackInfo(trackData) : null,
          trackData.type === "audio" ? this.audioSpecificTrackInfo(trackData) : null,
          trackData.type === "subtitle" ? this.subtitleSpecificTrackInfo(trackData) : null
        ] });
      }
    }
    videoSpecificTrackInfo(trackData) {
      const { frameRate, rotation } = trackData.track.metadata;
      const elements = [
        frameRate ? {
          id: 2352003 /* DefaultDuration */,
          data: 1e9 / frameRate
        } : null
      ];
      const flippedRotation = rotation ? normalizeRotation(-rotation) : 0;
      const hasNonSquarePixelAspectRatio = !!trackData.info.aspectRatio && trackData.info.aspectRatio.num * trackData.info.height !== trackData.info.aspectRatio.den * trackData.info.width;
      const colorSpace = trackData.info.decoderConfig.colorSpace;
      const videoElement = { id: 224 /* Video */, data: [
        { id: 176 /* PixelWidth */, data: trackData.info.width },
        { id: 186 /* PixelHeight */, data: trackData.info.height },
        hasNonSquarePixelAspectRatio ? { id: 21680 /* DisplayWidth */, data: trackData.info.aspectRatio.num } : null,
        hasNonSquarePixelAspectRatio ? { id: 21690 /* DisplayHeight */, data: trackData.info.aspectRatio.den } : null,
        hasNonSquarePixelAspectRatio ? { id: 21682 /* DisplayUnit */, data: 3 } : null,
        // 3 = display aspect ratio
        trackData.info.alphaMode ? { id: 21440 /* AlphaMode */, data: 1 } : null,
        colorSpaceIsComplete(colorSpace) ? {
          id: 21936 /* Colour */,
          data: [
            {
              id: 21937 /* MatrixCoefficients */,
              data: MATRIX_COEFFICIENTS_MAP[colorSpace.matrix]
            },
            {
              id: 21946 /* TransferCharacteristics */,
              data: TRANSFER_CHARACTERISTICS_MAP[colorSpace.transfer]
            },
            {
              id: 21947 /* Primaries */,
              data: COLOR_PRIMARIES_MAP[colorSpace.primaries]
            },
            {
              id: 21945 /* Range */,
              data: colorSpace.fullRange ? 2 : 1
            }
          ]
        } : null,
        flippedRotation ? {
          id: 30320 /* Projection */,
          data: [
            {
              id: 30321 /* ProjectionType */,
              data: 0
              // rectangular
            },
            {
              id: 30325 /* ProjectionPoseRoll */,
              data: new EBMLFloat32((flippedRotation + 180) % 360 - 180)
              // [0, 270] -> [-180, 90]
            }
          ]
        } : null
      ] };
      elements.push(videoElement);
      return elements;
    }
    audioSpecificTrackInfo(trackData) {
      const pcmInfo = PCM_AUDIO_CODECS.includes(trackData.track.source._codec) ? parsePcmCodec(trackData.track.source._codec) : null;
      return [
        { id: 225 /* Audio */, data: [
          { id: 181 /* SamplingFrequency */, data: new EBMLFloat32(trackData.info.sampleRate) },
          { id: 159 /* Channels */, data: trackData.info.numberOfChannels },
          pcmInfo ? { id: 25188 /* BitDepth */, data: 8 * pcmInfo.sampleSize } : null
        ] }
      ];
    }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    subtitleSpecificTrackInfo(trackData) {
      return [];
    }
    maybeCreateTags() {
      const simpleTags = [];
      const addSimpleTag = (key, value) => {
        simpleTags.push({ id: 26568 /* SimpleTag */, data: [
          { id: 17827 /* TagName */, data: new EBMLUnicodeString(key) },
          typeof value === "string" ? { id: 17543 /* TagString */, data: new EBMLUnicodeString(value) } : { id: 17541 /* TagBinary */, data: value }
        ] });
      };
      const metadataTags = this.output._metadataTags;
      const writtenTags = /* @__PURE__ */ new Set();
      for (const { key, value } of keyValueIterator(metadataTags)) {
        switch (key) {
          case "title":
            {
              addSimpleTag("TITLE", value);
              writtenTags.add("TITLE");
            }
            ;
            break;
          case "description":
            {
              addSimpleTag("DESCRIPTION", value);
              writtenTags.add("DESCRIPTION");
            }
            ;
            break;
          case "artist":
            {
              addSimpleTag("ARTIST", value);
              writtenTags.add("ARTIST");
            }
            ;
            break;
          case "album":
            {
              addSimpleTag("ALBUM", value);
              writtenTags.add("ALBUM");
            }
            ;
            break;
          case "albumArtist":
            {
              addSimpleTag("ALBUM_ARTIST", value);
              writtenTags.add("ALBUM_ARTIST");
            }
            ;
            break;
          case "genre":
            {
              addSimpleTag("GENRE", value);
              writtenTags.add("GENRE");
            }
            ;
            break;
          case "comment":
            {
              addSimpleTag("COMMENT", value);
              writtenTags.add("COMMENT");
            }
            ;
            break;
          case "lyrics":
            {
              addSimpleTag("LYRICS", value);
              writtenTags.add("LYRICS");
            }
            ;
            break;
          case "date":
            {
              addSimpleTag("DATE", value.toISOString().slice(0, 10));
              writtenTags.add("DATE");
            }
            ;
            break;
          case "trackNumber":
            {
              const string = metadataTags.tracksTotal !== void 0 ? `${value}/${metadataTags.tracksTotal}` : value.toString();
              addSimpleTag("PART_NUMBER", string);
              writtenTags.add("PART_NUMBER");
            }
            ;
            break;
          case "discNumber":
            {
              const string = metadataTags.discsTotal !== void 0 ? `${value}/${metadataTags.discsTotal}` : value.toString();
              addSimpleTag("DISC", string);
              writtenTags.add("DISC");
            }
            ;
            break;
          case "tracksTotal":
          case "discsTotal":
            {
            }
            ;
            break;
          case "images":
          case "raw":
            {
            }
            ;
            break;
          default:
            assertNever(key);
        }
      }
      if (metadataTags.raw) {
        for (const key in metadataTags.raw) {
          const value = metadataTags.raw[key];
          if (value == null || writtenTags.has(key)) {
            continue;
          }
          if (typeof value === "string" || value instanceof Uint8Array) {
            addSimpleTag(key, value);
          }
        }
      }
      if (simpleTags.length === 0) {
        return;
      }
      this.tagsElement = {
        id: 307544935 /* Tags */,
        data: [{ id: 29555 /* Tag */, data: [
          { id: 25536 /* Targets */, data: [
            { id: 26826 /* TargetTypeValue */, data: 50 },
            { id: 25546 /* TargetType */, data: "MOVIE" }
          ] },
          ...simpleTags
        ] }]
      };
    }
    maybeCreateAttachments() {
      const metadataTags = this.output._metadataTags;
      const elements = [];
      const existingFileUids = /* @__PURE__ */ new Set();
      const images = metadataTags.images ?? [];
      for (const image of images) {
        let imageName = image.name;
        if (imageName === void 0) {
          const baseName = image.kind === "coverFront" ? "cover" : image.kind === "coverBack" ? "back" : "image";
          imageName = baseName + (imageMimeTypeToExtension(image.mimeType) ?? "");
        }
        let fileUid;
        while (true) {
          fileUid = 0n;
          for (let i = 0; i < 8; i++) {
            fileUid <<= 8n;
            fileUid |= BigInt(Math.floor(Math.random() * 256));
          }
          if (fileUid !== 0n && !existingFileUids.has(fileUid)) {
            break;
          }
        }
        existingFileUids.add(fileUid);
        elements.push({
          id: 24999 /* AttachedFile */,
          data: [
            image.description !== void 0 ? { id: 18046 /* FileDescription */, data: new EBMLUnicodeString(image.description) } : null,
            { id: 18030 /* FileName */, data: new EBMLUnicodeString(imageName) },
            { id: 18016 /* FileMediaType */, data: image.mimeType },
            { id: 18012 /* FileData */, data: image.data },
            { id: 18094 /* FileUID */, data: fileUid }
          ]
        });
      }
      for (const [key, value] of Object.entries(metadataTags.raw ?? {})) {
        if (!(value instanceof AttachedFile)) {
          continue;
        }
        const keyIsNumeric = /^\d+$/.test(key);
        if (!keyIsNumeric) {
          continue;
        }
        if (images.find((x) => x.mimeType === value.mimeType && uint8ArraysAreEqual(x.data, value.data))) {
          continue;
        }
        elements.push({
          id: 24999 /* AttachedFile */,
          data: [
            value.description !== void 0 ? { id: 18046 /* FileDescription */, data: new EBMLUnicodeString(value.description) } : null,
            { id: 18030 /* FileName */, data: new EBMLUnicodeString(value.name ?? "") },
            { id: 18016 /* FileMediaType */, data: value.mimeType ?? "" },
            { id: 18012 /* FileData */, data: value.data },
            { id: 18094 /* FileUID */, data: BigInt(key) }
          ]
        });
      }
      if (elements.length === 0) {
        return;
      }
      this.attachmentsElement = { id: 423732329 /* Attachments */, data: elements };
    }
    createSegment() {
      this.createTracks();
      this.maybeCreateTags();
      this.maybeCreateAttachments();
      this.maybeCreateSeekHead(false);
      const segment = {
        id: 408125543 /* Segment */,
        size: this.format._options.appendOnly ? -1 : SEGMENT_SIZE_BYTES,
        data: [
          this.seekHead,
          // null if append-only
          this.segmentInfo,
          this.tracksElement,
          // Matroska spec says put this at the end of the file, but I think placing it before the first cluster
          // makes more sense, and FFmpeg agrees (argumentum ad ffmpegum fallacy)
          this.attachmentsElement,
          this.tagsElement
        ]
      };
      this.segment = segment;
      if (this.format._options.onSegmentHeader) {
        this.writer.startTrackingWrites();
      }
      this.ebmlWriter.writeEBML(segment);
      if (this.format._options.onSegmentHeader) {
        const { data, start } = this.writer.stopTrackingWrites();
        this.format._options.onSegmentHeader(data, start);
      }
    }
    createCues() {
      this.cues = { id: 475249515 /* Cues */, data: [] };
    }
    get segmentDataOffset() {
      assert(this.segment);
      return this.ebmlWriter.dataOffsets.get(this.segment);
    }
    allTracksAreKnown() {
      for (const track of this.output.tracks) {
        if (!track.source._closed && !this.trackDatas.some((x) => x.track === track)) {
          return false;
        }
      }
      return true;
    }
    async getMimeType() {
      await this.allTracksKnown.promise;
      const codecStrings = this.trackDatas.map((trackData) => {
        if (trackData.type === "video") {
          return trackData.info.decoderConfig.codec;
        } else if (trackData.type === "audio") {
          return trackData.info.decoderConfig.codec;
        } else {
          const map = {
            webvtt: "wvtt"
          };
          return map[trackData.track.source._codec];
        }
      });
      return buildMatroskaMimeType({
        isWebM: this.format instanceof WebMOutputFormat,
        hasVideo: this.trackDatas.some((x) => x.type === "video"),
        hasAudio: this.trackDatas.some((x) => x.type === "audio"),
        codecStrings
      });
    }
    getVideoTrackData(track, packet, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateVideoChunkMetadata(meta, track.source._codec);
      assert(meta);
      assert(meta.decoderConfig);
      assert(meta.decoderConfig.codedWidth !== void 0);
      assert(meta.decoderConfig.codedHeight !== void 0);
      const displayAspectWidth = meta.decoderConfig.displayAspectWidth;
      const displayAspectHeight = meta.decoderConfig.displayAspectHeight;
      const aspectRatio = displayAspectWidth === void 0 || displayAspectHeight === void 0 ? null : simplifyRational({
        num: displayAspectWidth,
        den: displayAspectHeight
      });
      const newTrackData = {
        track,
        type: "video",
        info: {
          width: meta.decoderConfig.codedWidth,
          height: meta.decoderConfig.codedHeight,
          aspectRatio,
          decoderConfig: meta.decoderConfig,
          alphaMode: packet ? !!packet.sideData.alpha : null
        },
        chunkQueue: [],
        lastWrittenMsTimestamp: null,
        codecPrivate: meta.decoderConfig.description ?? null,
        closed: false
      };
      if (track.source._codec === "vp9") {
        newTrackData.codecPrivate = new Uint8Array(
          generateVp9CodecConfigurationFromCodecString(newTrackData.info.decoderConfig.codec)
        );
      } else if (track.source._codec === "av1") {
        newTrackData.codecPrivate = new Uint8Array(
          generateAv1CodecConfigurationFromCodecString(newTrackData.info.decoderConfig.codec)
        );
      } else if (track.source._codec === "prores") {
        newTrackData.codecPrivate = textEncoder.encode(meta.decoderConfig.codec);
      }
      this.trackDatas.push(newTrackData);
      this.trackDatas.sort((a, b) => a.track.id - b.track.id);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    getAudioTrackData(track, packet, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateAudioChunkMetadata(meta, track.source._codec);
      assert(meta);
      assert(meta.decoderConfig);
      const decoderConfig = { ...meta.decoderConfig };
      let requiresAdtsStripping = false;
      if (track.source._codec === "aac" && !decoderConfig.description) {
        if (!packet) {
          throw new Error("No AAC description provided; you must therefore provide a priming packet.");
        }
        const adtsFrame = readAdtsFrameHeader(FileSlice4.tempFromBytes(packet.data));
        if (!adtsFrame) {
          throw new Error(
            "Couldn't parse ADTS header from the AAC packet. Make sure the packets are in ADTS format (as specified in ISO 13818-7) when not providing a description, or provide a description (must be an AudioSpecificConfig as specified in ISO 14496-3) and ensure the packets are raw AAC data."
          );
        }
        const sampleRate = aacFrequencyTable[adtsFrame.samplingFrequencyIndex];
        const numberOfChannels = aacChannelMap[adtsFrame.channelConfiguration];
        if (sampleRate === void 0 || numberOfChannels === void 0) {
          throw new Error("Invalid ADTS frame header.");
        }
        decoderConfig.description = buildAacAudioSpecificConfig({
          objectType: adtsFrame.objectType,
          sampleRate,
          numberOfChannels
        });
        requiresAdtsStripping = true;
      }
      const newTrackData = {
        track,
        type: "audio",
        info: {
          numberOfChannels: meta.decoderConfig.numberOfChannels,
          sampleRate: meta.decoderConfig.sampleRate,
          decoderConfig,
          requiresAdtsStripping
        },
        chunkQueue: [],
        lastWrittenMsTimestamp: null,
        codecPrivate: decoderConfig.description ?? null,
        closed: false
      };
      this.trackDatas.push(newTrackData);
      this.trackDatas.sort((a, b) => a.track.id - b.track.id);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    getSubtitleTrackData(track, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateSubtitleMetadata(meta);
      assert(meta);
      assert(meta.config);
      const newTrackData = {
        track,
        type: "subtitle",
        info: {
          config: meta.config
        },
        chunkQueue: [],
        lastWrittenMsTimestamp: null,
        codecPrivate: textEncoder.encode(meta.config.description),
        closed: false
      };
      this.trackDatas.push(newTrackData);
      this.trackDatas.sort((a, b) => a.track.id - b.track.id);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    async addEncodedVideoPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getVideoTrackData(track, packet, meta);
        trackData.info.alphaMode ??= !!packet.sideData.alpha;
        let packetData = packet.data;
        if (track.source._codec === "prores") {
          if (packetData.byteLength < 8) {
            throw new Error("ProRes packet too small, expected at least 8 bytes.");
          }
          packetData = packetData.subarray(8);
        }
        const isKeyFrame = packet.type === "key";
        this.validateTimestamp(trackData.track, packet.timestamp, isKeyFrame);
        let timestamp = packet.timestamp;
        let duration = packet.duration;
        if (track.metadata.frameRate !== void 0) {
          timestamp = roundToDivisor(timestamp, track.metadata.frameRate);
          duration = roundToDivisor(duration, track.metadata.frameRate);
        }
        const additions = trackData.info.alphaMode ? packet.sideData.alpha ?? null : null;
        const videoChunk = this.createInternalChunk(packetData, timestamp, duration, packet.type, additions);
        if (track.source._codec === "vp9") this.fixVP9ColorSpace(trackData, videoChunk);
        trackData.chunkQueue.push(videoChunk);
        await this.interleaveChunks();
      } finally {
        release();
      }
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getAudioTrackData(track, packet, meta);
        let packetData = packet.data;
        if (trackData.info.requiresAdtsStripping) {
          const adtsFrame = readAdtsFrameHeader(FileSlice4.tempFromBytes(packetData));
          if (!adtsFrame) {
            throw new Error("Expected ADTS frame, didn't get one.");
          }
          const headerLength = adtsFrame.crcCheck === null ? MIN_ADTS_FRAME_HEADER_SIZE : MAX_ADTS_FRAME_HEADER_SIZE;
          packetData = packetData.subarray(headerLength);
        }
        const isKeyFrame = packet.type === "key";
        this.validateTimestamp(trackData.track, packet.timestamp, isKeyFrame);
        const audioChunk = this.createInternalChunk(packetData, packet.timestamp, packet.duration, packet.type);
        trackData.chunkQueue.push(audioChunk);
        await this.interleaveChunks();
      } finally {
        release();
      }
    }
    async addSubtitleCue(track, cue, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getSubtitleTrackData(track, meta);
        this.validateTimestamp(trackData.track, cue.timestamp, true);
        let bodyText = cue.text;
        const timestampMs = Math.round(cue.timestamp * 1e3);
        inlineTimestampRegex.lastIndex = 0;
        bodyText = bodyText.replace(inlineTimestampRegex, (match) => {
          const time = parseSubtitleTimestamp(match.slice(1, -1));
          const offsetTime = time - timestampMs;
          return `<${formatSubtitleTimestamp(offsetTime)}>`;
        });
        const body = textEncoder.encode(bodyText);
        const additions = `${cue.settings ?? ""}
${cue.identifier ?? ""}
${cue.notes ?? ""}`;
        const subtitleChunk = this.createInternalChunk(
          body,
          cue.timestamp,
          cue.duration,
          "key",
          additions.trim() ? textEncoder.encode(additions) : null
        );
        trackData.chunkQueue.push(subtitleChunk);
        await this.interleaveChunks();
      } finally {
        release();
      }
    }
    async interleaveChunks(isFinalCall = false) {
      if (!isFinalCall && !this.allTracksAreKnown()) {
        return;
      }
      outer:
        while (true) {
          let trackWithMinTimestamp = null;
          let minTimestamp = Infinity;
          for (const trackData of this.trackDatas) {
            if (!isFinalCall && trackData.chunkQueue.length === 0 && !trackData.closed) {
              break outer;
            }
            if (trackData.chunkQueue.length > 0 && trackData.chunkQueue[0].timestamp < minTimestamp) {
              trackWithMinTimestamp = trackData;
              minTimestamp = trackData.chunkQueue[0].timestamp;
            }
          }
          if (!trackWithMinTimestamp) {
            break;
          }
          const chunk = trackWithMinTimestamp.chunkQueue.shift();
          this.writeBlock(trackWithMinTimestamp, chunk);
        }
      if (!isFinalCall) {
        await this.writer.flush();
      }
    }
    /**
     * Due to [a bug in Chromium](https://bugs.chromium.org/p/chromium/issues/detail?id=1377842), VP9 streams often
    	 * lack color space information. This method patches in that information.
     */
    fixVP9ColorSpace(trackData, chunk) {
      if (chunk.type !== "key") return;
      if (!trackData.info.decoderConfig.colorSpace || !trackData.info.decoderConfig.colorSpace.matrix) return;
      const bitstream = new Bitstream(chunk.data);
      bitstream.skipBits(2);
      const profileLowBit = bitstream.readBits(1);
      const profileHighBit = bitstream.readBits(1);
      const profile = (profileHighBit << 1) + profileLowBit;
      if (profile === 3) bitstream.skipBits(1);
      const showExistingFrame = bitstream.readBits(1);
      if (showExistingFrame) return;
      const frameType = bitstream.readBits(1);
      if (frameType !== 0) return;
      bitstream.skipBits(2);
      const syncCode = bitstream.readBits(24);
      if (syncCode !== 4817730) return;
      if (profile >= 2) bitstream.skipBits(1);
      const colorSpaceID = {
        rgb: 7,
        bt709: 2,
        bt470bg: 1,
        smpte170m: 3
      }[trackData.info.decoderConfig.colorSpace.matrix];
      writeBits(chunk.data, bitstream.pos, bitstream.pos + 3, colorSpaceID);
    }
    /** Converts a read-only external chunk into an internal one for easier use. */
    createInternalChunk(data, timestamp, duration, type, additions = null) {
      const internalChunk = {
        data,
        type,
        timestamp,
        duration,
        additions
      };
      return internalChunk;
    }
    /** Writes a block containing media data to the file. */
    writeBlock(trackData, chunk) {
      if (!this.segment) {
        this.createSegment();
      }
      const msTimestamp = Math.round(1e3 * chunk.timestamp);
      const keyFrameQueuedEverywhere = this.trackDatas.every((otherTrackData) => {
        if (trackData === otherTrackData) {
          return chunk.type === "key";
        }
        const firstQueuedSample = otherTrackData.chunkQueue[0];
        if (firstQueuedSample) {
          return firstQueuedSample.type === "key";
        }
        return otherTrackData.closed;
      });
      let shouldCreateNewCluster = false;
      if (!this.currentCluster) {
        shouldCreateNewCluster = true;
      } else {
        assert(this.currentClusterStartMsTimestamp !== null);
        assert(this.currentClusterMaxMsTimestamp !== null);
        const relativeTimestamp2 = msTimestamp - this.currentClusterStartMsTimestamp;
        shouldCreateNewCluster = keyFrameQueuedEverywhere && msTimestamp > this.currentClusterMaxMsTimestamp && relativeTimestamp2 >= 1e3 * (this.format._options.minimumClusterDuration ?? 1) || relativeTimestamp2 > MAX_CLUSTER_TIMESTAMP_MS;
      }
      if (shouldCreateNewCluster) {
        this.createNewCluster(msTimestamp);
      }
      const relativeTimestamp = msTimestamp - this.currentClusterStartMsTimestamp;
      if (relativeTimestamp < MIN_CLUSTER_TIMESTAMP_MS) {
        return;
      }
      const prelude = new Uint8Array(4);
      const view2 = new DataView(prelude.buffer);
      view2.setUint8(0, 128 | trackData.track.id);
      view2.setInt16(1, relativeTimestamp, false);
      const msDuration = Math.round(1e3 * chunk.duration);
      const needsBlockGroup = !!chunk.additions || trackData.type === "subtitle";
      if (!needsBlockGroup) {
        view2.setUint8(3, Number(chunk.type === "key") << 7);
        const simpleBlock = { id: 163 /* SimpleBlock */, data: [
          prelude,
          chunk.data
        ] };
        this.ebmlWriter.writeEBML(simpleBlock);
      } else {
        const blockGroup = { id: 160 /* BlockGroup */, data: [
          { id: 161 /* Block */, data: [
            prelude,
            chunk.data
          ] },
          chunk.type === "delta" ? {
            id: 251 /* ReferenceBlock */,
            data: new EBMLSignedInt(trackData.lastWrittenMsTimestamp - msTimestamp)
          } : null,
          chunk.additions ? { id: 30113 /* BlockAdditions */, data: [
            { id: 166 /* BlockMore */, data: [
              { id: 238 /* BlockAddID */, data: 1 },
              // Some players expect BlockAddID to come first
              { id: 165 /* BlockAdditional */, data: chunk.additions }
            ] }
          ] } : null,
          msDuration > 0 ? { id: 155 /* BlockDuration */, data: msDuration } : null
        ] };
        this.ebmlWriter.writeEBML(blockGroup);
      }
      this.startTimestamp = Math.min(this.startTimestamp, msTimestamp);
      this.endTimestamp = Math.max(this.endTimestamp, msTimestamp + msDuration);
      trackData.lastWrittenMsTimestamp = msTimestamp;
      if (!this.trackDatasInCurrentCluster.has(trackData)) {
        this.trackDatasInCurrentCluster.set(trackData, {
          firstMsTimestamp: msTimestamp
        });
      }
      this.currentClusterMaxMsTimestamp = Math.max(this.currentClusterMaxMsTimestamp, msTimestamp);
    }
    /** Creates a new Cluster element to contain media chunks. */
    createNewCluster(msTimestamp) {
      if (this.currentCluster) {
        this.finalizeCurrentCluster();
      }
      if (this.format._options.onCluster) {
        this.writer.startTrackingWrites();
      }
      this.currentCluster = {
        id: 524531317 /* Cluster */,
        size: this.format._options.appendOnly ? -1 : CLUSTER_SIZE_BYTES,
        data: [
          { id: 231 /* Timestamp */, data: msTimestamp }
        ]
      };
      this.ebmlWriter.writeEBML(this.currentCluster);
      this.currentClusterStartMsTimestamp = msTimestamp;
      this.currentClusterMaxMsTimestamp = msTimestamp;
      this.trackDatasInCurrentCluster.clear();
    }
    finalizeCurrentCluster() {
      assert(this.currentCluster);
      if (!this.format._options.appendOnly) {
        const clusterSize = this.writer.getPos() - this.ebmlWriter.dataOffsets.get(this.currentCluster);
        const endPos = this.writer.getPos();
        this.writer.seek(this.ebmlWriter.offsets.get(this.currentCluster) + 4);
        this.ebmlWriter.writeVarInt(clusterSize, CLUSTER_SIZE_BYTES);
        this.writer.seek(endPos);
      }
      if (this.format._options.onCluster) {
        assert(this.currentClusterStartMsTimestamp !== null);
        const { data, start } = this.writer.stopTrackingWrites();
        this.format._options.onCluster(data, start, this.currentClusterStartMsTimestamp / 1e3);
      }
      const clusterOffsetFromSegment = this.ebmlWriter.offsets.get(this.currentCluster) - this.segmentDataOffset;
      const groupedByTimestamp = /* @__PURE__ */ new Map();
      for (const [trackData, { firstMsTimestamp }] of this.trackDatasInCurrentCluster) {
        if (!groupedByTimestamp.has(firstMsTimestamp)) {
          groupedByTimestamp.set(firstMsTimestamp, []);
        }
        groupedByTimestamp.get(firstMsTimestamp).push(trackData);
      }
      const groupedAndSortedByTimestamp = [...groupedByTimestamp.entries()].sort((a, b) => a[0] - b[0]);
      for (const [msTimestamp, trackDatas] of groupedAndSortedByTimestamp) {
        assert(this.cues);
        this.cues.data.push({ id: 187 /* CuePoint */, data: [
          { id: 179 /* CueTime */, data: msTimestamp },
          // Create CueTrackPositions for each track that starts at this timestamp
          ...trackDatas.map((trackData) => {
            return { id: 183 /* CueTrackPositions */, data: [
              { id: 247 /* CueTrack */, data: trackData.track.id },
              { id: 241 /* CueClusterPosition */, data: clusterOffsetFromSegment }
            ] };
          })
        ] });
      }
    }
    // eslint-disable-next-line @typescript-eslint/no-misused-promises
    async onTrackClose(track) {
      const release = await this.mutex.acquire();
      const trackData = this.trackDatas.find((x) => x.track === track);
      if (trackData) {
        trackData.closed = true;
      }
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      await this.interleaveChunks();
      release();
    }
    /** Finalizes the file, making it ready for use. Must be called after all media chunks have been added. */
    async finalize() {
      const release = await this.mutex.acquire();
      this.allTracksKnown.resolve();
      for (const trackData of this.trackDatas) {
        trackData.closed = true;
      }
      if (!this.segment) {
        this.createSegment();
      }
      await this.interleaveChunks(true);
      if (this.currentCluster) {
        this.finalizeCurrentCluster();
      }
      assert(this.cues);
      this.ebmlWriter.writeEBML(this.cues);
      if (!this.format._options.appendOnly) {
        const segmentSize = this.writer.getPos() - this.segmentDataOffset;
        this.writer.seek(this.ebmlWriter.offsets.get(this.segment) + 4);
        this.ebmlWriter.writeVarInt(segmentSize, SEGMENT_SIZE_BYTES);
        const duration = this.startTimestamp === Infinity ? 0 : this.endTimestamp - this.startTimestamp;
        this.segmentDuration.data = new EBMLFloat64(duration);
        this.writer.seek(this.ebmlWriter.offsets.get(this.segmentDuration));
        this.ebmlWriter.writeEBML(this.segmentDuration);
        assert(this.seekHead);
        this.writer.seek(this.ebmlWriter.offsets.get(this.seekHead));
        this.maybeCreateSeekHead(true);
        this.ebmlWriter.writeEBML(this.seekHead);
      }
      release();
    }
  };

  // src/mp3/mp3-writer.ts
  var Mp3Writer = class {
    constructor(writer) {
      this.writer = writer;
      this.helper = new Uint8Array(8);
      this.helperView = new DataView(this.helper.buffer);
    }
    writeU32(value) {
      this.helperView.setUint32(0, value, false);
      this.writer.write(this.helper.subarray(0, 4));
    }
    writeXingFrame(data) {
      const startPos = this.writer.getPos();
      const firstByte = 255;
      const secondByte = 224 | data.mpegVersionId << 3 | data.layer << 1;
      let lowSamplingFrequency;
      if (data.mpegVersionId & 2) {
        lowSamplingFrequency = data.mpegVersionId & 1 ? 0 : 1;
      } else {
        lowSamplingFrequency = 1;
      }
      const padding = 0;
      const neededBytes = 155;
      let bitrateIndex = -1;
      const bitrateOffset = lowSamplingFrequency * 16 * 4 + data.layer * 16;
      for (let i = 0; i < 16; i++) {
        const kbr = KILOBIT_RATES[bitrateOffset + i];
        const size = computeMp3FrameSize(lowSamplingFrequency, data.layer, 1e3 * kbr, data.sampleRate, padding);
        if (size >= neededBytes) {
          bitrateIndex = i;
          break;
        }
      }
      if (bitrateIndex === -1) {
        throw new Error("No suitable bitrate found.");
      }
      const thirdByte = bitrateIndex << 4 | data.frequencyIndex << 2 | padding << 1;
      const fourthByte = data.channel << 6 | data.modeExtension << 4 | data.copyright << 3 | data.original << 2 | data.emphasis;
      this.helper[0] = firstByte;
      this.helper[1] = secondByte;
      this.helper[2] = thirdByte;
      this.helper[3] = fourthByte;
      this.writer.write(this.helper.subarray(0, 4));
      const xingOffset = getXingOffset(data.mpegVersionId, data.channel);
      this.writer.seek(startPos + xingOffset);
      this.writeU32(XING);
      let flags = 0;
      if (data.frameCount !== null) {
        flags |= 1 /* FrameCount */;
      }
      if (data.fileSize !== null) {
        flags |= 2 /* FileSize */;
      }
      if (data.toc !== null) {
        flags |= 4 /* Toc */;
      }
      this.writeU32(flags);
      this.writeU32(data.frameCount ?? 0);
      this.writeU32(data.fileSize ?? 0);
      this.writer.write(data.toc ?? new Uint8Array(100));
      const kilobitRate = KILOBIT_RATES[bitrateOffset + bitrateIndex];
      const frameSize = computeMp3FrameSize(
        lowSamplingFrequency,
        data.layer,
        1e3 * kilobitRate,
        data.sampleRate,
        padding
      );
      this.writer.write(new Uint8Array(startPos + frameSize - this.writer.getPos()));
    }
  };

  // src/mp3/mp3-muxer.ts
  var Mp3Muxer = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.xingFrameData = null;
      this.frameCount = 0;
      this.framePositions = [];
      this.xingFramePos = null;
      this.format = format;
    }
    async start() {
      const release = await this.mutex.acquire();
      this.writer = await this.output._getRootWriter(this.format._options.xingHeader === false);
      this.mp3Writer = new Mp3Writer(this.writer);
      if (!metadataTagsAreEmpty(this.output._metadataTags)) {
        const id3Writer = new Id3V2Writer(this.writer);
        id3Writer.writeId3V2Tag(this.output._metadataTags);
      }
      release();
    }
    async getMimeType() {
      return "audio/mpeg";
    }
    async addEncodedVideoPacket() {
      throw new Error("MP3 does not support video.");
    }
    async addEncodedAudioPacket(track, packet) {
      const release = await this.mutex.acquire();
      try {
        const writeXingHeader = this.format._options.xingHeader !== false;
        if (!this.xingFrameData && writeXingHeader) {
          const view2 = toDataView(packet.data);
          if (view2.byteLength < 4) {
            throw new Error("Invalid MP3 header in sample.");
          }
          const word = view2.getUint32(0, false);
          const header = readMp3FrameHeader(word, null).header;
          if (!header) {
            throw new Error("Invalid MP3 header in sample.");
          }
          const xingOffset = getXingOffset(header.mpegVersionId, header.channel);
          if (view2.byteLength >= xingOffset + 4) {
            const word2 = view2.getUint32(xingOffset, false);
            const isXing = word2 === XING || word2 === INFO;
            if (isXing) {
              return;
            }
          }
          this.xingFrameData = {
            mpegVersionId: header.mpegVersionId,
            layer: header.layer,
            frequencyIndex: header.frequencyIndex,
            sampleRate: header.sampleRate,
            channel: header.channel,
            modeExtension: header.modeExtension,
            copyright: header.copyright,
            original: header.original,
            emphasis: header.emphasis,
            frameCount: null,
            fileSize: null,
            toc: null
          };
          this.xingFramePos = this.writer.getPos();
          this.mp3Writer.writeXingFrame(this.xingFrameData);
          this.frameCount++;
        }
        this.validateTimestamp(track, packet.timestamp, packet.type === "key");
        if (writeXingHeader) {
          this.framePositions.push(this.writer.getPos());
        }
        this.writer.write(packet.data);
        this.frameCount++;
        await this.writer.flush();
      } finally {
        release();
      }
    }
    async addSubtitleCue() {
      throw new Error("MP3 does not support subtitles.");
    }
    async finalize() {
      const release = await this.mutex.acquire();
      if (!this.xingFrameData && this.format._options.xingHeader === false) {
        throw new Error(
          "Cannot finalize an empty MP3 file: not a single packet was added and the Xing header is disabled, so there's no frame we could write."
        );
      }
      if (!this.xingFrameData) {
        const track = this.output.tracks[0];
        assert(track?.isAudioTrack());
        const primingPacket = track.metadata.primingPacket;
        if (primingPacket) {
          const view2 = toDataView(primingPacket.data);
          if (view2.byteLength < 4) {
            throw new Error("Invalid MP3 header in priming packet.");
          }
          const word = view2.getUint32(0, false);
          const header = readMp3FrameHeader(word, null).header;
          if (!header) {
            throw new Error("Invalid MP3 header in priming packet.");
          }
          this.xingFrameData = {
            mpegVersionId: header.mpegVersionId,
            layer: header.layer,
            frequencyIndex: header.frequencyIndex,
            sampleRate: header.sampleRate,
            channel: header.channel,
            modeExtension: header.modeExtension,
            copyright: header.copyright,
            original: header.original,
            emphasis: header.emphasis,
            frameCount: null,
            fileSize: null,
            toc: null
          };
        } else if (track.metadata.decoderConfig) {
          const { sampleRate, numberOfChannels } = track.metadata.decoderConfig;
          const mpegVersionIds = [3, 2, 0];
          let mpegVersionId = null;
          let frequencyIndex = -1;
          for (let i = 0; i < mpegVersionIds.length; i++) {
            frequencyIndex = SAMPLING_RATES.indexOf(sampleRate << i);
            if (frequencyIndex !== -1) {
              mpegVersionId = mpegVersionIds[i];
              break;
            }
          }
          if (mpegVersionId === null) {
            throw new Error(`${sampleRate} Hz is not a valid MP3 sample rate.`);
          }
          this.xingFrameData = {
            mpegVersionId,
            layer: 1,
            // Layer III
            frequencyIndex,
            sampleRate,
            channel: numberOfChannels === 1 ? 3 : 0,
            // 3 = single channel, 0 = stereo
            modeExtension: 0,
            copyright: 0,
            original: 0,
            emphasis: 0,
            frameCount: null,
            fileSize: null,
            toc: null
          };
        } else {
          throw new Error(
            "Cannot finalize an empty MP3 file: no packets were added and the track specified neither a decoderConfig nor a primingPacket in its metadata, so there's no telling what the file should look like."
          );
        }
        this.xingFramePos = this.writer.getPos();
        this.mp3Writer.writeXingFrame(this.xingFrameData);
        this.frameCount++;
      }
      assert(this.xingFramePos !== null);
      const endPos = this.writer.getPos();
      const audioDataEndPos = endPos - this.xingFramePos;
      this.writer.seek(this.xingFramePos);
      if (this.framePositions.length > 0) {
        const toc = new Uint8Array(100);
        for (let i = 0; i < 100; i++) {
          const index = Math.floor(this.framePositions.length * (i / 100));
          const byteOffset = this.framePositions[index] - this.xingFramePos;
          toc[i] = 256 * (byteOffset / audioDataEndPos);
        }
        this.xingFrameData.toc = toc;
      }
      this.xingFrameData.frameCount = this.frameCount;
      this.xingFrameData.fileSize = audioDataEndPos;
      if (this.format._options.onXingFrame) {
        this.writer.startTrackingWrites();
      }
      this.mp3Writer.writeXingFrame(this.xingFrameData);
      if (this.format._options.onXingFrame) {
        const { data, start } = this.writer.stopTrackingWrites();
        this.format._options.onXingFrame(data, start);
      }
      release();
    }
  };

  // src/ogg/ogg-muxer.ts
  var PAGE_SIZE_TARGET = 8192;
  var OggMuxer = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.trackDatas = [];
      this.bosPagesWritten = false;
      this.allTracksKnown = promiseWithResolvers();
      this.pageBytes = new Uint8Array(MAX_PAGE_SIZE);
      this.pageView = new DataView(this.pageBytes.buffer);
      this.format = format;
    }
    async start() {
      const release = await this.mutex.acquire();
      this.writer = await this.output._getRootWriter(true);
      for (const track of this.output.tracks) {
        assert(track.isAudioTrack());
        if (track.metadata.decoderConfig) {
          this.getTrackData(track, { decoderConfig: track.metadata.decoderConfig });
        }
      }
      release();
    }
    async getMimeType() {
      await this.allTracksKnown.promise;
      return buildOggMimeType({
        codecStrings: this.trackDatas.map((x) => x.codecInfo.codec)
      });
    }
    addEncodedVideoPacket() {
      throw new Error("Video tracks are not supported.");
    }
    getTrackData(track, meta) {
      const existingTrackData = this.trackDatas.find((td) => td.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      let serialNumber;
      do {
        serialNumber = Math.floor(2 ** 32 * Math.random());
      } while (this.trackDatas.some((td) => td.serialNumber === serialNumber));
      assert(track.source._codec === "vorbis" || track.source._codec === "opus");
      validateAudioChunkMetadata(meta, track.source._codec);
      assert(meta);
      assert(meta.decoderConfig);
      const newTrackData = {
        track,
        serialNumber,
        internalSampleRate: track.source._codec === "opus" ? OPUS_SAMPLE_RATE : meta.decoderConfig.sampleRate,
        codecInfo: {
          codec: track.source._codec,
          vorbisInfo: null,
          opusInfo: null
        },
        vorbisLastBlocksize: null,
        packetQueue: [],
        currentTimestampInSamples: 0,
        pagesWritten: 0,
        currentGranulePosition: 0,
        currentLacingValues: [],
        currentPageData: [],
        currentPageSize: 27,
        currentPageStartsWithFreshPacket: true,
        currentPageStartTimestampInSamples: 0,
        closed: false
      };
      this.queueHeaderPackets(newTrackData, meta);
      this.trackDatas.push(newTrackData);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    queueHeaderPackets(trackData, meta) {
      assert(meta.decoderConfig);
      if (trackData.track.source._codec === "vorbis") {
        assert(meta.decoderConfig.description);
        const bytes2 = toUint8Array(meta.decoderConfig.description);
        if (bytes2[0] !== 2) {
          throw new TypeError("First byte of Vorbis decoder description must be 2.");
        }
        let pos = 1;
        const readPacketLength = () => {
          let length = 0;
          while (true) {
            const value = bytes2[pos++];
            if (value === void 0) {
              throw new TypeError("Vorbis decoder description is too short.");
            }
            length += value;
            if (value < 255) {
              return length;
            }
          }
        };
        const identificationHeaderLength = readPacketLength();
        const commentHeaderLength = readPacketLength();
        const setupHeaderLength = bytes2.length - pos;
        if (setupHeaderLength <= 0) {
          throw new TypeError("Vorbis decoder description is too short.");
        }
        const identificationHeader = bytes2.subarray(pos, pos += identificationHeaderLength);
        pos += commentHeaderLength;
        const setupHeader = bytes2.subarray(pos);
        const commentHeaderHeader = new Uint8Array(7);
        commentHeaderHeader[0] = 3;
        commentHeaderHeader[1] = 118;
        commentHeaderHeader[2] = 111;
        commentHeaderHeader[3] = 114;
        commentHeaderHeader[4] = 98;
        commentHeaderHeader[5] = 105;
        commentHeaderHeader[6] = 115;
        const commentHeader = createVorbisComments(commentHeaderHeader, this.output._metadataTags, true);
        trackData.packetQueue.push({
          data: identificationHeader,
          timestampInSamples: 0,
          durationInSamples: 0,
          forcePageFlush: true
        }, {
          data: commentHeader,
          timestampInSamples: 0,
          durationInSamples: 0,
          forcePageFlush: false
        }, {
          data: setupHeader,
          timestampInSamples: 0,
          durationInSamples: 0,
          forcePageFlush: true
          // The last header packet must flush the page
        });
        const view2 = toDataView(identificationHeader);
        const blockSizeByte = view2.getUint8(28);
        trackData.codecInfo.vorbisInfo = {
          blocksizes: [
            1 << (blockSizeByte & 15),
            1 << (blockSizeByte >> 4)
          ],
          modeBlockflags: parseModesFromVorbisSetupPacket(setupHeader).modeBlockflags
        };
      } else if (trackData.track.source._codec === "opus") {
        if (!meta.decoderConfig.description) {
          throw new TypeError("For Ogg, Opus decoder description is required.");
        }
        const identificationHeader = toUint8Array(meta.decoderConfig.description);
        const commentHeaderHeader = new Uint8Array(8);
        const commentHeaderHeaderView = toDataView(commentHeaderHeader);
        commentHeaderHeaderView.setUint32(0, 1332770163, false);
        commentHeaderHeaderView.setUint32(4, 1415669619, false);
        const commentHeader = createVorbisComments(commentHeaderHeader, this.output._metadataTags, true);
        trackData.packetQueue.push({
          data: identificationHeader,
          timestampInSamples: 0,
          durationInSamples: 0,
          forcePageFlush: true
        }, {
          data: commentHeader,
          timestampInSamples: 0,
          durationInSamples: 0,
          forcePageFlush: true
          // The last header packet must flush the page
        });
        trackData.codecInfo.opusInfo = {
          preSkip: parseOpusIdentificationHeader(identificationHeader).preSkip
        };
      }
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getTrackData(track, meta);
        this.validateTimestamp(trackData.track, packet.timestamp, packet.type === "key");
        const currentTimestampInSamples = trackData.currentTimestampInSamples;
        const { durationInSamples, vorbisBlockSize } = extractSampleMetadata(
          packet.data,
          trackData.codecInfo,
          trackData.vorbisLastBlocksize
        );
        trackData.currentTimestampInSamples += durationInSamples;
        trackData.vorbisLastBlocksize = vorbisBlockSize;
        trackData.packetQueue.push({
          data: packet.data,
          timestampInSamples: currentTimestampInSamples,
          durationInSamples,
          forcePageFlush: false
        });
        await this.interleavePages();
      } finally {
        release();
      }
    }
    addSubtitleCue() {
      throw new Error("Subtitle tracks are not supported.");
    }
    allTracksAreKnown() {
      for (const track of this.output.tracks) {
        if (!track.source._closed && !this.trackDatas.some((x) => x.track === track)) {
          return false;
        }
      }
      return true;
    }
    async interleavePages(isFinalCall = false) {
      if (!this.bosPagesWritten) {
        if (!this.allTracksAreKnown() && !isFinalCall) {
          return;
        }
        for (const trackData of this.trackDatas) {
          while (trackData.packetQueue.length > 0) {
            const packet = trackData.packetQueue.shift();
            this.writePacket(trackData, packet, false);
            if (packet.forcePageFlush) {
              break;
            }
          }
        }
        this.bosPagesWritten = true;
      }
      outer:
        while (true) {
          let trackWithMinTimestamp = null;
          let minTimestamp = Infinity;
          for (const trackData of this.trackDatas) {
            if (!isFinalCall && trackData.packetQueue.length <= 1 && !trackData.closed) {
              break outer;
            }
            if (trackData.packetQueue.length > 0 && trackData.packetQueue[0].timestampInSamples < minTimestamp) {
              trackWithMinTimestamp = trackData;
              minTimestamp = trackData.packetQueue[0].timestampInSamples;
            }
          }
          if (!trackWithMinTimestamp) {
            break;
          }
          const packet = trackWithMinTimestamp.packetQueue.shift();
          const isFinalPacket = trackWithMinTimestamp.packetQueue.length === 0;
          this.writePacket(trackWithMinTimestamp, packet, isFinalPacket);
        }
      if (!isFinalCall) {
        await this.writer.flush();
      }
    }
    writePacket(trackData, packet, isFinalPacket) {
      const packetEndTimestampInSamples = packet.timestampInSamples + packet.durationInSamples;
      if (this.format._options.maximumPageDuration !== void 0) {
        const maxDurationInSamples = this.format._options.maximumPageDuration * trackData.internalSampleRate;
        if (trackData.currentLacingValues.length > 0 && packetEndTimestampInSamples - trackData.currentPageStartTimestampInSamples > maxDurationInSamples) {
          this.writePage(trackData, false);
        }
      }
      let remainingLength = packet.data.length;
      let dataStartOffset = 0;
      let dataOffset = 0;
      while (true) {
        if (trackData.currentLacingValues.length === 0 && dataStartOffset > 0) {
          trackData.currentPageStartsWithFreshPacket = false;
        }
        const segmentSize = Math.min(255, remainingLength);
        trackData.currentLacingValues.push(segmentSize);
        trackData.currentPageSize++;
        dataOffset += segmentSize;
        const segmentIsLastOfPacket = remainingLength < 255;
        if (trackData.currentLacingValues.length === 255) {
          const slice2 = packet.data.subarray(dataStartOffset, dataOffset);
          dataStartOffset = dataOffset;
          trackData.currentPageData.push(slice2);
          trackData.currentPageSize += slice2.length;
          this.writePage(trackData, isFinalPacket && segmentIsLastOfPacket);
          if (segmentIsLastOfPacket) {
            return;
          }
        }
        if (segmentIsLastOfPacket) {
          break;
        }
        remainingLength -= 255;
      }
      const slice = packet.data.subarray(dataStartOffset);
      trackData.currentPageData.push(slice);
      trackData.currentPageSize += slice.length;
      trackData.currentGranulePosition = packetEndTimestampInSamples;
      if (trackData.currentPageSize >= PAGE_SIZE_TARGET || packet.forcePageFlush) {
        this.writePage(trackData, isFinalPacket);
      }
    }
    writePage(trackData, isEos) {
      this.pageView.setUint32(0, OGGS, true);
      this.pageView.setUint8(4, 0);
      let headerType = 0;
      if (!trackData.currentPageStartsWithFreshPacket) {
        headerType |= 1;
      }
      if (trackData.pagesWritten === 0) {
        headerType |= 2;
      }
      if (isEos) {
        headerType |= 4;
      }
      this.pageView.setUint8(5, headerType);
      const granulePosition = trackData.currentLacingValues.every((x) => x === 255) ? -1 : trackData.currentGranulePosition;
      setInt64(this.pageView, 6, granulePosition, true);
      this.pageView.setUint32(14, trackData.serialNumber, true);
      this.pageView.setUint32(18, trackData.pagesWritten, true);
      this.pageView.setUint32(22, 0, true);
      this.pageView.setUint8(26, trackData.currentLacingValues.length);
      this.pageBytes.set(trackData.currentLacingValues, 27);
      let pos = 27 + trackData.currentLacingValues.length;
      for (const data of trackData.currentPageData) {
        this.pageBytes.set(data, pos);
        pos += data.length;
      }
      const slice = this.pageBytes.subarray(0, pos);
      const crc = computeOggPageCrc(slice);
      this.pageView.setUint32(22, crc, true);
      trackData.pagesWritten++;
      trackData.currentLacingValues.length = 0;
      trackData.currentPageData.length = 0;
      trackData.currentPageSize = 27;
      trackData.currentPageStartsWithFreshPacket = true;
      trackData.currentPageStartTimestampInSamples = trackData.currentGranulePosition;
      if (this.format._options.onPage) {
        this.writer.startTrackingWrites();
      }
      this.writer.write(slice);
      if (this.format._options.onPage) {
        const { data, start } = this.writer.stopTrackingWrites();
        this.format._options.onPage(data, start, trackData.track.source);
      }
    }
    // eslint-disable-next-line @typescript-eslint/no-misused-promises
    async onTrackClose(track) {
      const release = await this.mutex.acquire();
      const trackData = this.trackDatas.find((x) => x.track === track);
      if (trackData) {
        trackData.closed = true;
      }
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      await this.interleavePages();
      release();
    }
    async finalize() {
      const release = await this.mutex.acquire();
      this.allTracksKnown.resolve();
      for (const trackData of this.trackDatas) {
        trackData.closed = true;
      }
      await this.interleavePages(true);
      for (const trackData of this.trackDatas) {
        if (trackData.currentLacingValues.length > 0) {
          this.writePage(trackData, true);
        }
      }
      release();
    }
  };

  // src/mpeg-ts/mpeg-ts-muxer.ts
  var PAT_PID = 0;
  var PMT_PID = 4096;
  var FIRST_TRACK_PID = 256;
  var VIDEO_STREAM_ID_BASE = 224;
  var AUDIO_STREAM_ID_BASE = 192;
  var AVC_AUD_NAL = new Uint8Array([9, 240]);
  var HEVC_AUD_NAL = new Uint8Array([70, 1]);
  var MpegTsMuxer = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.trackDatas = [];
      this.tablesWritten = false;
      this.continuityCounters = /* @__PURE__ */ new Map();
      this.packetBuffer = new Uint8Array(TS_PACKET_SIZE);
      this.packetView = toDataView(this.packetBuffer);
      this.allTracksKnown = promiseWithResolvers();
      this.videoTrackIndex = 0;
      this.audioTrackIndex = 0;
      this.adaptationFieldBuffer = new Uint8Array(184);
      this.payloadBuffer = new Uint8Array(184);
      this.format = format;
    }
    async start() {
      const release = await this.mutex.acquire();
      this.writer = await this.output._getRootWriter(true);
      release();
    }
    async getMimeType() {
      await this.allTracksKnown.promise;
      return buildMpegTsMimeType(this.trackDatas.map((x) => x.codecString));
    }
    getVideoTrackData(track, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateVideoChunkMetadata(meta, track.source._codec);
      assert(meta?.decoderConfig);
      const codec = track.source._codec;
      assert(codec === "avc" || codec === "hevc");
      const streamType = codec === "avc" ? 27 /* AVC */ : 36 /* HEVC */;
      const pid = FIRST_TRACK_PID + this.trackDatas.length;
      const streamId = VIDEO_STREAM_ID_BASE + this.videoTrackIndex++;
      const newTrackData = {
        track,
        pid,
        streamType,
        streamId,
        codecString: meta.decoderConfig.codec,
        timestampProcessingQueue: [],
        packetQueue: [],
        inputIsAnnexB: null,
        inputIsAdts: null,
        avcDecoderConfig: null,
        hevcDecoderConfig: null,
        adtsHeader: null,
        adtsHeaderBitstream: null,
        firstPacketWritten: false,
        closed: false
      };
      this.trackDatas.push(newTrackData);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    getAudioTrackData(track, meta) {
      const existingTrackData = this.trackDatas.find((x) => x.track === track);
      if (existingTrackData) {
        return existingTrackData;
      }
      validateAudioChunkMetadata(meta, track.source._codec);
      assert(meta?.decoderConfig);
      const codec = track.source._codec;
      assert(codec === "aac" || codec === "mp3" || codec === "ac3" || codec === "eac3");
      let streamType;
      let streamId;
      switch (codec) {
        case "aac":
          {
            streamType = 15 /* AAC */;
            streamId = AUDIO_STREAM_ID_BASE + this.audioTrackIndex++;
          }
          ;
          break;
        case "mp3":
          {
            streamType = 3 /* MP3_MPEG1 */;
            streamId = AUDIO_STREAM_ID_BASE + this.audioTrackIndex++;
          }
          ;
          break;
        case "ac3":
          {
            streamType = 129 /* AC3_SYSTEM_A */;
            streamId = 189;
          }
          ;
          break;
        case "eac3":
          {
            streamType = 135 /* EAC3_SYSTEM_A */;
            streamId = 189;
          }
          ;
          break;
      }
      const pid = FIRST_TRACK_PID + this.trackDatas.length;
      const newTrackData = {
        track,
        pid,
        streamType,
        streamId,
        codecString: meta.decoderConfig.codec,
        timestampProcessingQueue: [],
        packetQueue: [],
        inputIsAnnexB: null,
        inputIsAdts: null,
        avcDecoderConfig: null,
        hevcDecoderConfig: null,
        adtsHeader: null,
        adtsHeaderBitstream: null,
        firstPacketWritten: false,
        closed: false
      };
      this.trackDatas.push(newTrackData);
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      return newTrackData;
    }
    async addEncodedVideoPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getVideoTrackData(track, meta);
        this.validateTimestamp(
          trackData.track,
          packet.timestamp,
          packet.type === "key"
        );
        const preparedData = this.prepareVideoPacket(trackData, packet, meta);
        if (packet.type === "key") {
          await this.flushTimestampQueue(trackData);
        }
        trackData.timestampProcessingQueue.push({
          data: preparedData,
          presentationTimestamp: packet.timestamp,
          decodeTimestamp: null,
          isKeyframe: packet.type === "key"
        });
      } finally {
        release();
      }
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        const trackData = this.getAudioTrackData(track, meta);
        this.validateTimestamp(
          trackData.track,
          packet.timestamp,
          packet.type === "key"
        );
        const preparedData = this.prepareAudioPacket(trackData, packet, meta);
        if (packet.type === "key") {
          await this.flushTimestampQueue(trackData);
        }
        trackData.timestampProcessingQueue.push({
          data: preparedData,
          presentationTimestamp: packet.timestamp,
          decodeTimestamp: null,
          isKeyframe: packet.type === "key"
        });
      } finally {
        release();
      }
    }
    async addSubtitleCue() {
      throw new Error("MPEG-TS does not support subtitles.");
    }
    prepareVideoPacket(trackData, packet, meta) {
      const codec = trackData.track.source._codec;
      if (trackData.inputIsAnnexB === null) {
        const description = meta?.decoderConfig?.description;
        trackData.inputIsAnnexB = !description;
        if (!trackData.inputIsAnnexB) {
          const bytes2 = toUint8Array(description);
          if (codec === "avc") {
            trackData.avcDecoderConfig = deserializeAvcDecoderConfigurationRecord(bytes2);
          } else {
            trackData.hevcDecoderConfig = deserializeHevcDecoderConfigurationRecord(bytes2);
          }
        }
      }
      if (trackData.inputIsAnnexB) {
        return this.prepareAnnexBVideoPacket(packet.data, codec);
      } else {
        return this.prepareLengthPrefixedVideoPacket(trackData, packet, codec);
      }
    }
    prepareAnnexBVideoPacket(data, codec) {
      const nalUnits = [];
      for (const loc of iterateNalUnitsInAnnexB(data)) {
        const nalUnit = data.subarray(loc.offset, loc.offset + loc.length);
        const isAud = codec === "avc" ? extractNalUnitTypeForAvc(nalUnit[0]) === 9 /* AUD */ : extractNalUnitTypeForHevc(nalUnit[0]) === 35 /* AUD_NUT */;
        if (!isAud) {
          nalUnits.push(nalUnit);
        }
      }
      const aud = codec === "avc" ? AVC_AUD_NAL : HEVC_AUD_NAL;
      nalUnits.unshift(aud);
      return concatNalUnitsInAnnexB(nalUnits);
    }
    prepareLengthPrefixedVideoPacket(trackData, packet, codec) {
      const data = packet.data;
      const lengthSize = codec === "avc" ? trackData.avcDecoderConfig.lengthSizeMinusOne + 1 : trackData.hevcDecoderConfig.lengthSizeMinusOne + 1;
      const nalUnits = [];
      for (const loc of iterateNalUnitsInLengthPrefixed(data, lengthSize)) {
        const nalUnit = data.subarray(loc.offset, loc.offset + loc.length);
        const isAud = codec === "avc" ? extractNalUnitTypeForAvc(nalUnit[0]) === 9 /* AUD */ : extractNalUnitTypeForHevc(nalUnit[0]) === 35 /* AUD_NUT */;
        if (!isAud) {
          nalUnits.push(nalUnit);
        }
      }
      if (packet.type === "key") {
        if (codec === "avc") {
          const config = trackData.avcDecoderConfig;
          for (const pps of config.pictureParameterSets) {
            nalUnits.unshift(pps);
          }
          for (const sps of config.sequenceParameterSets) {
            nalUnits.unshift(sps);
          }
        } else {
          const config = trackData.hevcDecoderConfig;
          for (const arr of config.arrays) {
            if (arr.nalUnitType === 34 /* PPS_NUT */) {
              for (const nal of arr.nalUnits) {
                nalUnits.unshift(nal);
              }
            }
          }
          for (const arr of config.arrays) {
            if (arr.nalUnitType === 33 /* SPS_NUT */) {
              for (const nal of arr.nalUnits) {
                nalUnits.unshift(nal);
              }
            }
          }
          for (const arr of config.arrays) {
            if (arr.nalUnitType === 32 /* VPS_NUT */) {
              for (const nal of arr.nalUnits) {
                nalUnits.unshift(nal);
              }
            }
          }
        }
      }
      const aud = codec === "avc" ? AVC_AUD_NAL : HEVC_AUD_NAL;
      nalUnits.unshift(aud);
      return concatNalUnitsInAnnexB(nalUnits);
    }
    prepareAudioPacket(trackData, packet, meta) {
      const codec = trackData.track.source._codec;
      if (codec === "mp3" || codec === "ac3" || codec === "eac3") {
        return packet.data;
      }
      if (trackData.inputIsAdts === null) {
        const description = meta?.decoderConfig?.description;
        trackData.inputIsAdts = !description;
        if (!trackData.inputIsAdts) {
          const config = parseAacAudioSpecificConfig(toUint8Array(description));
          const template = buildAdtsHeaderTemplate(config);
          trackData.adtsHeader = template.header;
          trackData.adtsHeaderBitstream = template.bitstream;
        }
      }
      if (trackData.inputIsAdts) {
        return packet.data;
      }
      assert(trackData.adtsHeader);
      assert(trackData.adtsHeaderBitstream);
      const header = trackData.adtsHeader;
      const frameLength = packet.data.byteLength + header.byteLength;
      writeAdtsFrameLength(trackData.adtsHeaderBitstream, frameLength);
      const result = new Uint8Array(frameLength);
      result.set(header, 0);
      result.set(packet.data, header.byteLength);
      return result;
    }
    allTracksAreKnown() {
      for (const track of this.output.tracks) {
        if (!track.source._closed && !this.trackDatas.some((x) => x.track === track)) {
          return false;
        }
      }
      return true;
    }
    async flushTimestampQueue(trackData, alsoInterleave = true) {
      if (trackData.timestampProcessingQueue.length === 0) {
        return;
      }
      const sortedTimestamps = trackData.timestampProcessingQueue.map((packet) => packet.presentationTimestamp).sort((a, b) => a - b);
      for (let i = 0; i < trackData.timestampProcessingQueue.length; i++) {
        const queuedPacket = trackData.timestampProcessingQueue[i];
        queuedPacket.decodeTimestamp = sortedTimestamps[i];
        trackData.packetQueue.push(queuedPacket);
      }
      trackData.timestampProcessingQueue.length = 0;
      if (alsoInterleave) {
        await this.interleavePackets();
      }
    }
    async interleavePackets(isFinalCall = false) {
      if (!this.tablesWritten) {
        if (!this.allTracksAreKnown() && !isFinalCall) {
          return;
        }
        this.writeTables();
      }
      outer:
        while (true) {
          let trackWithMinTimestamp = null;
          let minTimestamp = Infinity;
          for (const trackData of this.trackDatas) {
            if (!isFinalCall && trackData.packetQueue.length === 0 && !trackData.closed) {
              break outer;
            }
            if (trackData.packetQueue.length > 0 && trackData.packetQueue[0].presentationTimestamp < minTimestamp) {
              trackWithMinTimestamp = trackData;
              minTimestamp = trackData.packetQueue[0].presentationTimestamp;
            }
          }
          if (!trackWithMinTimestamp) {
            break;
          }
          const queuedPacket = trackWithMinTimestamp.packetQueue.shift();
          this.writePesPacket(trackWithMinTimestamp, queuedPacket);
        }
      if (!isFinalCall) {
        await this.writer.flush();
      }
    }
    writeTables() {
      assert(!this.tablesWritten);
      this.writePsiSection(PAT_PID, PAT_SECTION);
      this.writePsiSection(PMT_PID, buildPmt(this.trackDatas));
      this.tablesWritten = true;
    }
    writePsiSection(pid, section) {
      let offset = 0;
      let isFirst = true;
      while (offset < section.length) {
        const pointerFieldSize = isFirst ? 1 : 0;
        const availablePayload = 184 - pointerFieldSize;
        const remainingData = section.length - offset;
        const chunkSize = Math.min(availablePayload, remainingData);
        let payload;
        if (isFirst) {
          payload = this.payloadBuffer.subarray(0, 1 + chunkSize);
          payload[0] = 0;
          payload.set(section.subarray(offset, offset + chunkSize), 1);
        } else {
          payload = section.subarray(offset, offset + chunkSize);
        }
        this.writeTsPacket(pid, isFirst, null, payload);
        offset += chunkSize;
        isFirst = false;
      }
    }
    writePesPacket(trackData, queuedPacket) {
      const includeDts = trackData.track.type === "video";
      const headerDataLength = includeDts ? 10 : 5;
      const pesHeaderBuffer = new Uint8Array(9 + headerDataLength);
      const pesView = toDataView(pesHeaderBuffer);
      const ptsDtsBitstream = new Bitstream(pesHeaderBuffer.subarray(9));
      setUint24(pesView, 0, 1, false);
      pesHeaderBuffer[3] = trackData.streamId;
      const pesPacketLength = trackData.track.type === "video" ? 0 : Math.min(8 + queuedPacket.data.length, 65535);
      pesView.setUint16(4, pesPacketLength, false);
      pesView.setUint8(6, 132);
      pesView.setUint8(7, includeDts ? 192 : 128);
      pesView.setUint8(8, headerDataLength);
      const pts = Math.round(queuedPacket.presentationTimestamp * TIMESCALE);
      ptsDtsBitstream.pos = 0;
      ptsDtsBitstream.writeBits(4, includeDts ? 3 : 2);
      ptsDtsBitstream.writeBits(3, pts >>> 30 & 7);
      ptsDtsBitstream.writeBits(1, 1);
      ptsDtsBitstream.writeBits(15, pts >>> 15 & 32767);
      ptsDtsBitstream.writeBits(1, 1);
      ptsDtsBitstream.writeBits(15, pts & 32767);
      ptsDtsBitstream.writeBits(1, 1);
      if (includeDts) {
        assert(queuedPacket.decodeTimestamp !== null);
        const dts = Math.round(queuedPacket.decodeTimestamp * TIMESCALE);
        ptsDtsBitstream.writeBits(4, 1);
        ptsDtsBitstream.writeBits(3, dts >>> 30 & 7);
        ptsDtsBitstream.writeBits(1, 1);
        ptsDtsBitstream.writeBits(15, dts >>> 15 & 32767);
        ptsDtsBitstream.writeBits(1, 1);
        ptsDtsBitstream.writeBits(15, dts & 32767);
        ptsDtsBitstream.writeBits(1, 1);
      }
      const totalLength = pesHeaderBuffer.length + queuedPacket.data.length;
      let offset = 0;
      let isFirstTsPacket = true;
      while (offset < totalLength) {
        const pusi = isFirstTsPacket;
        const remainingData = totalLength - offset;
        const randomAccessIndicator = isFirstTsPacket && queuedPacket.isKeyframe;
        const discontinuityIndicator = isFirstTsPacket && !trackData.firstPacketWritten;
        const basePaddingNeeded = Math.max(0, 184 - remainingData);
        let adaptationFieldSize;
        if (randomAccessIndicator || discontinuityIndicator) {
          adaptationFieldSize = Math.max(2, basePaddingNeeded);
        } else {
          adaptationFieldSize = basePaddingNeeded;
        }
        let adaptationField = null;
        if (adaptationFieldSize > 0) {
          const buf = this.adaptationFieldBuffer;
          if (adaptationFieldSize === 1) {
            buf[0] = 0;
          } else {
            buf[0] = adaptationFieldSize - 1;
            buf[1] = Number(discontinuityIndicator) << 7 | Number(randomAccessIndicator) << 6;
            buf.fill(255, 2, adaptationFieldSize);
          }
          adaptationField = buf.subarray(0, adaptationFieldSize);
        }
        const payloadSize = Math.min(184 - adaptationFieldSize, remainingData);
        const payload = this.payloadBuffer.subarray(0, payloadSize);
        let payloadOffset = 0;
        if (offset < pesHeaderBuffer.length) {
          const headerBytes = Math.min(pesHeaderBuffer.length - offset, payloadSize);
          payload.set(pesHeaderBuffer.subarray(offset, offset + headerBytes), 0);
          payloadOffset = headerBytes;
        }
        const dataStart = Math.max(0, offset - pesHeaderBuffer.length);
        const dataEnd = dataStart + (payloadSize - payloadOffset);
        if (payloadOffset < payloadSize) {
          payload.set(queuedPacket.data.subarray(dataStart, dataEnd), payloadOffset);
        }
        this.writeTsPacket(trackData.pid, pusi, adaptationField, payload);
        offset += payloadSize;
        isFirstTsPacket = false;
      }
      trackData.firstPacketWritten = true;
    }
    writeTsPacket(pid, pusi, adaptationField, payload) {
      const cc = this.continuityCounters.get(pid) ?? 0;
      const hasPayload = payload.length > 0;
      const adaptCtrl = adaptationField ? hasPayload ? 3 : 2 : hasPayload ? 1 : 0;
      this.packetBuffer[0] = 71;
      this.packetView.setUint16(1, (pusi ? 16384 : 0) | pid & 8191, false);
      this.packetBuffer[3] = adaptCtrl << 4 | cc & 15;
      if (hasPayload) {
        this.continuityCounters.set(pid, cc + 1 & 15);
      }
      let offset = 4;
      if (adaptationField) {
        this.packetBuffer.set(adaptationField, offset);
        offset += adaptationField.length;
      }
      this.packetBuffer.set(payload, offset);
      offset += payload.length;
      if (offset < TS_PACKET_SIZE) {
        this.packetBuffer.fill(255, offset);
      }
      const startPos = this.writer.getPos();
      this.writer.write(this.packetBuffer);
      if (this.format._options.onPacket) {
        this.format._options.onPacket(this.packetBuffer.slice(), startPos);
      }
    }
    // eslint-disable-next-line @typescript-eslint/no-misused-promises
    async onTrackClose(track) {
      const release = await this.mutex.acquire();
      const trackData = this.trackDatas.find((x) => x.track === track);
      if (trackData) {
        trackData.closed = true;
        await this.flushTimestampQueue(trackData, false);
      }
      if (this.allTracksAreKnown()) {
        this.allTracksKnown.resolve();
      }
      await this.interleavePackets();
      release();
    }
    async finalize() {
      const release = await this.mutex.acquire();
      this.allTracksKnown.resolve();
      for (const trackData of this.trackDatas) {
        trackData.closed = true;
        await this.flushTimestampQueue(trackData, false);
      }
      await this.interleavePackets(true);
      release();
    }
  };
  var MPEG_TS_CRC_POLYNOMIAL = 79764919;
  var MPEG_TS_CRC_TABLE = new Uint32Array(256);
  for (let n = 0; n < 256; n++) {
    let crc = n << 24;
    for (let k = 0; k < 8; k++) {
      crc = crc & 2147483648 ? crc << 1 ^ MPEG_TS_CRC_POLYNOMIAL : crc << 1;
    }
    MPEG_TS_CRC_TABLE[n] = crc >>> 0 & 4294967295;
  }
  var computeMpegTsCrc32 = (data) => {
    let crc = 4294967295;
    for (let i = 0; i < data.length; i++) {
      const byte = data[i];
      crc = (crc << 8 ^ MPEG_TS_CRC_TABLE[crc >>> 24 ^ byte]) >>> 0;
    }
    return crc;
  };
  var PAT_SECTION = new Uint8Array(16);
  {
    const view2 = toDataView(PAT_SECTION);
    PAT_SECTION[0] = 0;
    view2.setUint16(1, 45069, false);
    view2.setUint16(3, 1, false);
    PAT_SECTION[5] = 193;
    PAT_SECTION[6] = 0;
    PAT_SECTION[7] = 0;
    view2.setUint16(8, 1, false);
    view2.setUint16(10, 57344 | PMT_PID & 8191, false);
    view2.setUint32(12, computeMpegTsCrc32(PAT_SECTION.subarray(0, 12)), false);
  }
  var buildPmt = (trackDatas) => {
    let totalEsBytes = 0;
    for (const trackData of trackDatas) {
      totalEsBytes += 5;
      if (trackData.streamType === 129 /* AC3_SYSTEM_A */) {
        totalEsBytes += AC3_REGISTRATION_DESCRIPTOR.length;
      } else if (trackData.streamType === 135 /* EAC3_SYSTEM_A */) {
        totalEsBytes += EAC3_REGISTRATION_DESCRIPTOR.length;
      }
    }
    const sectionLength = 9 + totalEsBytes + 4;
    const section = new Uint8Array(3 + sectionLength - 4);
    const view2 = toDataView(section);
    section[0] = 2;
    view2.setUint16(1, 45056 | sectionLength & 4095, false);
    view2.setUint16(3, 1, false);
    section[5] = 193;
    section[6] = 0;
    section[7] = 0;
    view2.setUint16(8, 57344 | 8191, false);
    view2.setUint16(10, 61440, false);
    let offset = 12;
    for (const trackData of trackDatas) {
      section[offset++] = trackData.streamType;
      view2.setUint16(offset, 57344 | trackData.pid & 8191, false);
      offset += 2;
      if (trackData.streamType === 129 /* AC3_SYSTEM_A */) {
        view2.setUint16(offset, 61440 | AC3_REGISTRATION_DESCRIPTOR.length, false);
        offset += 2;
        section.set(AC3_REGISTRATION_DESCRIPTOR, offset);
        offset += AC3_REGISTRATION_DESCRIPTOR.length;
      } else if (trackData.streamType === 135 /* EAC3_SYSTEM_A */) {
        view2.setUint16(offset, 61440 | EAC3_REGISTRATION_DESCRIPTOR.length, false);
        offset += 2;
        section.set(EAC3_REGISTRATION_DESCRIPTOR, offset);
        offset += EAC3_REGISTRATION_DESCRIPTOR.length;
      } else {
        view2.setUint16(offset, 61440, false);
        offset += 2;
      }
    }
    const crc = computeMpegTsCrc32(section);
    const result = new Uint8Array(section.length + 4);
    result.set(section, 0);
    toDataView(result).setUint32(section.length, crc, false);
    return result;
  };

  // src/wave/riff-writer.ts
  var RiffWriter = class {
    constructor(writer) {
      this.writer = writer;
      this.helper = new Uint8Array(8);
      this.helperView = new DataView(this.helper.buffer);
    }
    writeU16(value) {
      this.helperView.setUint16(0, value, true);
      this.writer.write(this.helper.subarray(0, 2));
    }
    writeU32(value) {
      this.helperView.setUint32(0, value, true);
      this.writer.write(this.helper.subarray(0, 4));
    }
    writeU64(value) {
      this.helperView.setUint32(0, value, true);
      this.helperView.setUint32(4, Math.floor(value / 2 ** 32), true);
      this.writer.write(this.helper);
    }
    writeAscii(text) {
      this.writer.write(new TextEncoder().encode(text));
    }
  };

  // src/wave/wave-muxer.ts
  var WaveMuxer = class extends Muxer {
    constructor(output, format) {
      super(output);
      this.headerWritten = false;
      this.dataSize = 0;
      this.sampleRate = null;
      this.sampleCount = 0;
      this.riffSizePos = null;
      this.dataSizePos = null;
      this.ds64RiffSizePos = null;
      this.ds64DataSizePos = null;
      this.ds64SampleCountPos = null;
      this.format = format;
      this.isRf64 = !!format._options.large;
    }
    async start() {
      const release = await this.mutex.acquire();
      this.writer = await this.output._getRootWriter(false);
      this.riffWriter = new RiffWriter(this.writer);
      const track = this.output.tracks[0];
      assert(track?.isAudioTrack());
      if (track.metadata.decoderConfig) {
        validateAudioChunkMetadata({ decoderConfig: track.metadata.decoderConfig }, track.source._codec);
        this.writeHeader(track, track.metadata.decoderConfig);
        this.sampleRate = track.metadata.decoderConfig.sampleRate;
        this.headerWritten = true;
      }
      release();
    }
    async getMimeType() {
      return "audio/wav";
    }
    async addEncodedVideoPacket() {
      throw new Error("WAVE does not support video.");
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const release = await this.mutex.acquire();
      try {
        if (!this.headerWritten) {
          validateAudioChunkMetadata(meta, track.source._codec);
          assert(meta);
          assert(meta.decoderConfig);
          this.writeHeader(track, meta.decoderConfig);
          this.sampleRate = meta.decoderConfig.sampleRate;
          this.headerWritten = true;
        }
        this.validateTimestamp(track, packet.timestamp, packet.type === "key");
        if (!this.isRf64 && this.writer.getPos() + packet.data.byteLength >= 2 ** 32) {
          throw new Error(
            "Adding more audio data would exceed the maximum RIFF size of 4 GiB. To write larger files, use RF64 by setting `large: true` in the WavOutputFormatOptions."
          );
        }
        this.writer.write(packet.data);
        this.dataSize += packet.data.byteLength;
        this.sampleCount += Math.round(packet.duration * this.sampleRate);
        await this.writer.flush();
      } finally {
        release();
      }
    }
    async addSubtitleCue() {
      throw new Error("WAVE does not support subtitles.");
    }
    writeHeader(track, config) {
      if (this.format._options.onHeader) {
        this.writer.startTrackingWrites();
      }
      let format;
      const codec = track.source._codec;
      const pcmInfo = parsePcmCodec(codec);
      if (pcmInfo.dataType === "ulaw") {
        format = 7 /* MULAW */;
      } else if (pcmInfo.dataType === "alaw") {
        format = 6 /* ALAW */;
      } else if (pcmInfo.dataType === "float") {
        format = 3 /* IEEE_FLOAT */;
      } else {
        format = 1 /* PCM */;
      }
      const channels = config.numberOfChannels;
      const sampleRate = config.sampleRate;
      const blockSize = pcmInfo.sampleSize * channels;
      this.riffWriter.writeAscii(this.isRf64 ? "RF64" : "RIFF");
      if (this.isRf64) {
        this.riffWriter.writeU32(4294967295);
      } else {
        this.riffSizePos = this.writer.getPos();
        this.riffWriter.writeU32(0);
      }
      this.riffWriter.writeAscii("WAVE");
      if (this.isRf64) {
        this.riffWriter.writeAscii("ds64");
        this.riffWriter.writeU32(28);
        this.ds64RiffSizePos = this.writer.getPos();
        this.riffWriter.writeU64(0);
        this.ds64DataSizePos = this.writer.getPos();
        this.riffWriter.writeU64(0);
        this.ds64SampleCountPos = this.writer.getPos();
        this.riffWriter.writeU64(0);
        this.riffWriter.writeU32(0);
      }
      this.riffWriter.writeAscii("fmt ");
      this.riffWriter.writeU32(16);
      this.riffWriter.writeU16(format);
      this.riffWriter.writeU16(channels);
      this.riffWriter.writeU32(sampleRate);
      this.riffWriter.writeU32(sampleRate * blockSize);
      this.riffWriter.writeU16(blockSize);
      this.riffWriter.writeU16(8 * pcmInfo.sampleSize);
      if (!metadataTagsAreEmpty(this.output._metadataTags)) {
        const metadataFormat = this.format._options.metadataFormat ?? "info";
        if (metadataFormat === "info") {
          this.writeInfoChunk(this.output._metadataTags);
        } else if (metadataFormat === "id3") {
          this.writeId3Chunk(this.output._metadataTags);
        } else {
          assertNever(metadataFormat);
        }
      }
      this.riffWriter.writeAscii("data");
      if (this.isRf64) {
        this.riffWriter.writeU32(4294967295);
      } else {
        this.dataSizePos = this.writer.getPos();
        this.riffWriter.writeU32(0);
      }
      if (this.format._options.onHeader) {
        const { data, start } = this.writer.stopTrackingWrites();
        this.format._options.onHeader(data, start);
      }
    }
    writeInfoChunk(metadata) {
      const startPos = this.writer.getPos();
      this.riffWriter.writeAscii("LIST");
      this.riffWriter.writeU32(0);
      this.riffWriter.writeAscii("INFO");
      const writtenTags = /* @__PURE__ */ new Set();
      const writeInfoTag = (tag, value) => {
        if (!isIso88591Compatible(value)) {
          Logging._warn(`Didn't write tag '${tag}' because '${value}' is not ISO 8859-1-compatible.`);
          return;
        }
        const size = value.length + 1;
        const bytes2 = new Uint8Array(size);
        for (let i = 0; i < value.length; i++) {
          bytes2[i] = value.charCodeAt(i);
        }
        this.riffWriter.writeAscii(tag);
        this.riffWriter.writeU32(size);
        this.writer.write(bytes2);
        if (size & 1) {
          this.writer.write(new Uint8Array(1));
        }
        writtenTags.add(tag);
      };
      for (const { key, value } of keyValueIterator(metadata)) {
        switch (key) {
          case "title":
            {
              writeInfoTag("INAM", value);
              writtenTags.add("INAM");
            }
            ;
            break;
          case "artist":
            {
              writeInfoTag("IART", value);
              writtenTags.add("IART");
            }
            ;
            break;
          case "album":
            {
              writeInfoTag("IPRD", value);
              writtenTags.add("IPRD");
            }
            ;
            break;
          case "trackNumber":
            {
              const string = metadata.tracksTotal !== void 0 ? `${value}/${metadata.tracksTotal}` : value.toString();
              writeInfoTag("ITRK", string);
              writtenTags.add("ITRK");
            }
            ;
            break;
          case "genre":
            {
              writeInfoTag("IGNR", value);
              writtenTags.add("IGNR");
            }
            ;
            break;
          case "date":
            {
              writeInfoTag("ICRD", value.toISOString().slice(0, 10));
              writtenTags.add("ICRD");
            }
            ;
            break;
          case "comment":
            {
              writeInfoTag("ICMT", value);
              writtenTags.add("ICMT");
            }
            ;
            break;
          case "albumArtist":
          case "discNumber":
          case "tracksTotal":
          case "discsTotal":
          case "description":
          case "lyrics":
          case "images":
            {
            }
            ;
            break;
          case "raw":
            {
            }
            ;
            break;
          default:
            assertNever(key);
        }
      }
      if (metadata.raw) {
        for (const key in metadata.raw) {
          const value = metadata.raw[key];
          if (value == null || key.length !== 4 || writtenTags.has(key)) {
            continue;
          }
          if (typeof value === "string") {
            writeInfoTag(key, value);
          }
        }
      }
      const endPos = this.writer.getPos();
      const chunkSize = endPos - startPos - 8;
      this.writer.seek(startPos + 4);
      this.riffWriter.writeU32(chunkSize);
      this.writer.seek(endPos);
      if (chunkSize & 1) {
        this.writer.write(new Uint8Array(1));
      }
    }
    writeId3Chunk(metadata) {
      const startPos = this.writer.getPos();
      this.riffWriter.writeAscii("ID3 ");
      this.riffWriter.writeU32(0);
      const id3Writer = new Id3V2Writer(this.writer);
      const id3TagSize = id3Writer.writeId3V2Tag(metadata);
      const endPos = this.writer.getPos();
      this.writer.seek(startPos + 4);
      this.riffWriter.writeU32(id3TagSize);
      this.writer.seek(endPos);
      if (id3TagSize & 1) {
        this.writer.write(new Uint8Array(1));
      }
    }
    async finalize() {
      const release = await this.mutex.acquire();
      if (!this.headerWritten) {
        throw new Error(
          "Cannot finalize an empty WAVE file: no packets were added and the track specified no decoderConfig in its metadata, so there's no telling what the file should look like."
        );
      }
      const endPos = this.writer.getPos();
      if (this.isRf64) {
        assert(this.ds64RiffSizePos !== null);
        this.writer.seek(this.ds64RiffSizePos);
        this.riffWriter.writeU64(endPos - 8);
        assert(this.ds64DataSizePos !== null);
        this.writer.seek(this.ds64DataSizePos);
        this.riffWriter.writeU64(this.dataSize);
        assert(this.ds64SampleCountPos !== null);
        this.writer.seek(this.ds64SampleCountPos);
        this.riffWriter.writeU64(this.sampleCount);
      } else {
        assert(this.riffSizePos !== null);
        this.writer.seek(this.riffSizePos);
        this.riffWriter.writeU32(endPos - 8);
        assert(this.dataSizePos !== null);
        this.writer.seek(this.dataSizePos);
        this.riffWriter.writeU32(this.dataSize);
      }
      release();
    }
  };

  // src/resample.ts
  var AudioResampler = class {
    constructor(options) {
      this.sourceSampleRate = null;
      this.sourceNumberOfChannels = null;
      this.startTime = null;
      /** Start frame of current buffer */
      this.bufferStartFrame = 0;
      /** The highest index written to in the current buffer */
      this.maxWrittenFrame = null;
      this.targetSampleRate = options.targetSampleRate;
      this.targetNumberOfChannels = options.targetNumberOfChannels;
      this.onSample = options.onSample;
      this.bufferSizeInFrames = Math.floor(this.targetSampleRate * 5);
      this.bufferSizeInSamples = this.bufferSizeInFrames * this.targetNumberOfChannels;
      this.outputBuffer = new Float32Array(this.bufferSizeInSamples);
    }
    /**
     * Sets up the channel mixer to handle up/downmixing in the case where input and output channel counts don't match.
     */
    doChannelMixerSetup() {
      assert(this.sourceNumberOfChannels !== null);
      const sourceNum = this.sourceNumberOfChannels;
      const targetNum = this.targetNumberOfChannels;
      if (sourceNum === 1 && targetNum === 2) {
        this.channelMixer = (sourceData, sourceFrameIndex) => {
          return sourceData[sourceFrameIndex * sourceNum];
        };
      } else if (sourceNum === 1 && targetNum === 4) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          return sourceData[sourceFrameIndex * sourceNum] * +(targetChannelIndex < 2);
        };
      } else if (sourceNum === 1 && targetNum === 6) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          return sourceData[sourceFrameIndex * sourceNum] * +(targetChannelIndex === 2);
        };
      } else if (sourceNum === 2 && targetNum === 1) {
        this.channelMixer = (sourceData, sourceFrameIndex) => {
          const baseIdx = sourceFrameIndex * sourceNum;
          return 0.5 * (sourceData[baseIdx] + sourceData[baseIdx + 1]);
        };
      } else if (sourceNum === 2 && targetNum === 4) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          return sourceData[sourceFrameIndex * sourceNum + targetChannelIndex] * +(targetChannelIndex < 2);
        };
      } else if (sourceNum === 2 && targetNum === 6) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          return sourceData[sourceFrameIndex * sourceNum + targetChannelIndex] * +(targetChannelIndex < 2);
        };
      } else if (sourceNum === 4 && targetNum === 1) {
        this.channelMixer = (sourceData, sourceFrameIndex) => {
          const baseIdx = sourceFrameIndex * sourceNum;
          return 0.25 * (sourceData[baseIdx] + sourceData[baseIdx + 1] + sourceData[baseIdx + 2] + sourceData[baseIdx + 3]);
        };
      } else if (sourceNum === 4 && targetNum === 2) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          const baseIdx = sourceFrameIndex * sourceNum;
          return 0.5 * (sourceData[baseIdx + targetChannelIndex] + sourceData[baseIdx + targetChannelIndex + 2]);
        };
      } else if (sourceNum === 4 && targetNum === 6) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          const baseIdx = sourceFrameIndex * sourceNum;
          if (targetChannelIndex < 2) return sourceData[baseIdx + targetChannelIndex];
          if (targetChannelIndex === 2 || targetChannelIndex === 3) return 0;
          return sourceData[baseIdx + targetChannelIndex - 2];
        };
      } else if (sourceNum === 6 && targetNum === 1) {
        this.channelMixer = (sourceData, sourceFrameIndex) => {
          const baseIdx = sourceFrameIndex * sourceNum;
          return Math.SQRT1_2 * (sourceData[baseIdx] + sourceData[baseIdx + 1]) + sourceData[baseIdx + 2] + 0.5 * (sourceData[baseIdx + 4] + sourceData[baseIdx + 5]);
        };
      } else if (sourceNum === 6 && targetNum === 2) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          const baseIdx = sourceFrameIndex * sourceNum;
          return sourceData[baseIdx + targetChannelIndex] + Math.SQRT1_2 * (sourceData[baseIdx + 2] + sourceData[baseIdx + targetChannelIndex + 4]);
        };
      } else if (sourceNum === 6 && targetNum === 4) {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          const baseIdx = sourceFrameIndex * sourceNum;
          if (targetChannelIndex < 2) {
            return sourceData[baseIdx + targetChannelIndex] + Math.SQRT1_2 * sourceData[baseIdx + 2];
          }
          return sourceData[baseIdx + targetChannelIndex + 2];
        };
      } else {
        this.channelMixer = (sourceData, sourceFrameIndex, targetChannelIndex) => {
          return targetChannelIndex < sourceNum ? sourceData[sourceFrameIndex * sourceNum + targetChannelIndex] : 0;
        };
      }
    }
    ensureTempBufferSize(requiredSamples) {
      let length = this.tempSourceBuffer.length;
      while (length < requiredSamples) {
        length *= 2;
      }
      if (length !== this.tempSourceBuffer.length) {
        const newBuffer = new Float32Array(length);
        newBuffer.set(this.tempSourceBuffer);
        this.tempSourceBuffer = newBuffer;
      }
    }
    async add(audioSample) {
      if (this.sourceSampleRate === null) {
        this.sourceSampleRate = audioSample.sampleRate;
        this.sourceNumberOfChannels = audioSample.numberOfChannels;
        this.startTime = audioSample.timestamp;
        this.tempSourceBuffer = new Float32Array(this.sourceSampleRate * this.sourceNumberOfChannels);
        this.doChannelMixerSetup();
      }
      assert(this.startTime !== null);
      const requiredSamples = audioSample.numberOfFrames * audioSample.numberOfChannels;
      this.ensureTempBufferSize(requiredSamples);
      const sourceDataSize = audioSample.allocationSize({ planeIndex: 0, format: "f32" });
      const sourceView = new Float32Array(this.tempSourceBuffer.buffer, 0, sourceDataSize / 4);
      audioSample.copyTo(sourceView, { planeIndex: 0, format: "f32" });
      const inputStartTime = audioSample.timestamp - this.startTime;
      const inputEndTime = inputStartTime + audioSample.duration;
      const outputStartFrame = Math.floor((inputStartTime - 1 / this.sourceSampleRate) * this.targetSampleRate) + 1;
      const outputEndFrame = Math.ceil(inputEndTime * this.targetSampleRate);
      for (let outputFrame = outputStartFrame; outputFrame < outputEndFrame; outputFrame++) {
        if (outputFrame < this.bufferStartFrame) {
          continue;
        }
        while (outputFrame >= this.bufferStartFrame + this.bufferSizeInFrames) {
          await this.finalizeCurrentBuffer();
          this.bufferStartFrame += this.bufferSizeInFrames;
        }
        const bufferFrameIndex = outputFrame - this.bufferStartFrame;
        assert(bufferFrameIndex < this.bufferSizeInFrames);
        const outputTime = outputFrame / this.targetSampleRate;
        const inputTime = outputTime - inputStartTime;
        const sourcePosition = inputTime * this.sourceSampleRate;
        const sourceLowerFrame = Math.floor(sourcePosition);
        const sourceUpperFrame = Math.ceil(sourcePosition);
        const fraction = sourcePosition - sourceLowerFrame;
        for (let targetChannel = 0; targetChannel < this.targetNumberOfChannels; targetChannel++) {
          let lowerSample = 0;
          let upperSample = 0;
          if (sourceLowerFrame >= 0 && sourceLowerFrame < audioSample.numberOfFrames) {
            lowerSample = this.channelMixer(sourceView, sourceLowerFrame, targetChannel);
          }
          if (sourceUpperFrame >= 0 && sourceUpperFrame < audioSample.numberOfFrames) {
            upperSample = this.channelMixer(sourceView, sourceUpperFrame, targetChannel);
          }
          const outputSample = lowerSample + fraction * (upperSample - lowerSample);
          const outputIndex = bufferFrameIndex * this.targetNumberOfChannels + targetChannel;
          this.outputBuffer[outputIndex] += outputSample;
        }
        if (this.maxWrittenFrame === null) {
          this.maxWrittenFrame = bufferFrameIndex;
        } else {
          this.maxWrittenFrame = Math.max(this.maxWrittenFrame, bufferFrameIndex);
        }
      }
    }
    async finalizeCurrentBuffer() {
      if (this.maxWrittenFrame === null) {
        return;
      }
      assert(this.startTime !== null);
      const samplesWritten = (this.maxWrittenFrame + 1) * this.targetNumberOfChannels;
      const outputData = new Float32Array(samplesWritten);
      outputData.set(this.outputBuffer.subarray(0, samplesWritten));
      const audioSample = new AudioSample({
        format: "f32",
        sampleRate: this.targetSampleRate,
        numberOfChannels: this.targetNumberOfChannels,
        timestamp: this.startTime + this.bufferStartFrame / this.targetSampleRate,
        data: outputData
      });
      await this.onSample(audioSample);
      this.outputBuffer.fill(0);
      this.maxWrittenFrame = null;
    }
    finalize() {
      return this.finalizeCurrentBuffer();
    }
  };

  // src/media-source.ts
  var MediaSource = class {
    constructor() {
      /** @internal */
      this._connectedTrack = null;
      /** @internal */
      this._closingPromise = null;
      /** @internal */
      this._closed = false;
    }
    /** @internal */
    _ensureValidAdd() {
      if (!this._connectedTrack) {
        throw new Error("Source is not connected to an output track.");
      }
      if (this._connectedTrack.output.state === "canceled") {
        throw new Error("Output has been canceled.");
      }
      if (this._connectedTrack.output.state === "finalizing" || this._connectedTrack.output.state === "finalized") {
        throw new Error("Output has been finalized.");
      }
      if (this._connectedTrack.output.state === "pending") {
        throw new Error("Output has not started.");
      }
      if (this._closed) {
        throw new Error("Source is closed.");
      }
    }
    /** @internal */
    async _start() {
    }
    /** @internal */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    async _flushAndClose(forceClose) {
    }
    /**
     * Closes this source. This prevents future samples from being added and signals to the output file that no further
     * samples will come in for this track. Calling `.close()` is optional but recommended after adding the
     * last sample - for improved performance and reduced memory usage.
     */
    close() {
      if (this._closingPromise) {
        return;
      }
      const connectedTrack = this._connectedTrack;
      if (!connectedTrack) {
        throw new Error("Cannot call close without connecting the source to an output track.");
      }
      if (connectedTrack.output.state === "pending") {
        throw new Error("Cannot call close before output has been started.");
      }
      this._closingPromise = (async () => {
        await this._flushAndClose(false);
        this._closed = true;
        if (connectedTrack.output.state === "finalizing" || connectedTrack.output.state === "finalized") {
          return;
        }
        connectedTrack.output._muxer.onTrackClose(connectedTrack);
      })();
    }
    /** @internal */
    async _flushOrWaitForOngoingClose(forceClose) {
      return this._closingPromise ??= (async () => {
        await this._flushAndClose(forceClose);
        this._closed = true;
      })();
    }
  };
  var VideoSource = class extends MediaSource {
    /** Internal constructor. */
    constructor(codec) {
      super();
      /** @internal */
      this._connectedTrack = null;
      if (!VIDEO_CODECS.includes(codec)) {
        throw new TypeError(`Invalid video codec '${codec}'. Must be one of: ${VIDEO_CODECS.join(", ")}.`);
      }
      this._codec = codec;
    }
  };
  var maybeEnsureIsKeyPacket = (track, packet) => {
    if (track.metadata.hasOnlyKeyPackets && packet.type !== "key") {
      throw new Error("Cannot add non-key packets to a hasOnlyKeyPackets video track.");
    }
  };
  var EncodedVideoPacketSource = class extends VideoSource {
    /** Creates a new {@link EncodedVideoPacketSource} whose packets are encoded using `codec`. */
    constructor(codec) {
      super(codec);
    }
    /**
     * Adds an encoded packet to the output video track. Packets must be added in *decode order*, while a packet's
     * timestamp must be its *presentation timestamp*. B-frames are handled automatically.
     *
     * @param meta - Additional metadata from the encoder. You should pass this for the first call, including a valid
     * decoder config.
     *
     * @returns A Promise that resolves once the output is ready to receive more samples. You should await this Promise
     * to respect writer and encoder backpressure.
     */
    add(packet, meta) {
      if (!(packet instanceof EncodedPacket)) {
        throw new TypeError("packet must be an EncodedPacket.");
      }
      if (packet.isMetadataOnly) {
        throw new TypeError("Metadata-only packets cannot be added.");
      }
      if (meta !== void 0 && (!meta || typeof meta !== "object")) {
        throw new TypeError("meta, when provided, must be an object.");
      }
      this._ensureValidAdd();
      maybeEnsureIsKeyPacket(this._connectedTrack, packet);
      return this._connectedTrack.output._muxer.addEncodedVideoPacket(this._connectedTrack, packet, meta);
    }
  };
  var VideoEncoderWrapper = class {
    constructor(source, encodingConfig) {
      this.source = source;
      this.encodingConfig = encodingConfig;
      this.ensureEncoderPromise = null;
      this.encoderInitialized = false;
      this.encoder = null;
      this.muxer = null;
      this.lastMultipleOfKeyFrameInterval = -1;
      this.emittedEncoderPackets = 0;
      // Tracks the input dimensions of the first frame
      this.codedWidth = null;
      this.codedHeight = null;
      // Tracks the output dimensions of the first frame (used to lock dimensions for fill/contain/cover)
      this.outputWidth = null;
      this.outputHeight = null;
      // Frame rate normalization state
      this.frameRateLastSample = null;
      this.frameRateLastTimestamp = null;
      this.frameRateLastEndTimestamp = null;
      // VideoEncoder converts everything to microseconds, so we need to do some bookkeeping to restore the original
      // timing information
      this.preciseTimings = [];
      this.customEncoder = null;
      this.customEncoderCallSerializer = new CallSerializer();
      this.customEncoderQueueSize = 0;
      // Set when the encoder uses quantizer-based rate control; carries the quantizer value applied to each frame
      this.defaultEncodeOptions = {};
      // Alpha stuff
      this.alphaEncoder = null;
      this.splitter = null;
      this.splitterCreationFailed = false;
      this.alphaFrameQueue = [];
      /**
       * Encoders typically throw their errors "out of band", meaning asynchronously in some other execution context.
       * However, we want to surface these errors to the user within the normal control flow, so they don't go uncaught.
       * So, we keep track of the encoder error and throw it as soon as we get the chance.
       */
      this.error = null;
      this.errorSet = false;
      this.lastMuxerPromise = Promise.resolve();
      this.closed = false;
    }
    setError(error) {
      if (!this.errorSet) {
        this.error = error;
        this.errorSet = true;
      }
    }
    async add(videoSample, shouldClose, encodeOptions) {
      const originalSample = videoSample;
      try {
        this.checkForEncoderError();
        this.source._ensureValidAdd();
        const config = this.encodingConfig;
        const sizeChangeBehavior = config.sizeChangeBehavior ?? "deny";
        let isSizeChange = false;
        if (this.codedWidth !== null && this.codedHeight !== null) {
          if (videoSample.codedWidth !== this.codedWidth || videoSample.codedHeight !== this.codedHeight) {
            isSizeChange = true;
            if (sizeChangeBehavior === "deny") {
              throw new Error(
                `Video sample size must remain constant. Expected ${this.codedWidth}x${this.codedHeight}, got ${videoSample.codedWidth}x${videoSample.codedHeight}. To allow the sample size to change over time, set \`sizeChangeBehavior\` to a value other than 'deny' in the encoding options.`
              );
            }
          }
        } else {
          this.codedWidth = videoSample.codedWidth;
          this.codedHeight = videoSample.codedHeight;
        }
        const hasTransformConfig = config.transform?.width !== void 0 || config.transform?.height !== void 0 || config.transform?.rotate !== void 0 || config.transform?.crop !== void 0 || config.transform?.force === true;
        const needsTransform = hasTransformConfig || isSizeChange && sizeChangeBehavior !== "passThrough";
        if (needsTransform) {
          let targetWidth = config.transform?.width;
          let targetHeight = config.transform?.height;
          let appliedFit = config.transform?.fit ?? "fill";
          if (isSizeChange && sizeChangeBehavior !== "passThrough") {
            assert(this.outputWidth);
            assert(this.outputHeight);
            assert(sizeChangeBehavior !== "deny");
            targetWidth = this.outputWidth;
            targetHeight = this.outputHeight;
            appliedFit = sizeChangeBehavior;
          }
          const transformed = await videoSample.transform({
            width: targetWidth,
            height: targetHeight,
            roundDimensionsTo: 2,
            crop: config.transform?.crop,
            rotate: config.transform?.rotate,
            fit: appliedFit,
            alpha: config.alpha
          });
          if (this.outputWidth === null || this.outputHeight === null) {
            this.outputWidth = transformed.displayWidth;
            this.outputHeight = transformed.displayHeight;
          }
          if (shouldClose) {
            videoSample.close();
          }
          videoSample = transformed;
          shouldClose = true;
        } else {
          if (this.outputWidth === null || this.outputHeight === null) {
            this.outputWidth = videoSample.codedWidth;
            this.outputHeight = videoSample.codedHeight;
          }
        }
        const frameRate = config.transform?.frameRate;
        if (frameRate !== void 0) {
          const originalEndTimestamp = videoSample.timestamp + videoSample.duration;
          const alignedTimestamp = floorToDivisor(videoSample.timestamp, frameRate);
          if (this.frameRateLastSample !== null) {
            if (alignedTimestamp <= this.frameRateLastTimestamp) {
              this.frameRateLastSample.close();
              this.frameRateLastSample = videoSample.clone();
              this.frameRateLastEndTimestamp = originalEndTimestamp;
              return;
            } else {
              await this.padFrameRate(alignedTimestamp, encodeOptions);
            }
          }
          if (videoSample === originalSample) {
            videoSample = videoSample.clone();
            shouldClose = true;
          }
          videoSample.setTimestamp(alignedTimestamp);
          videoSample.setDuration(1 / frameRate);
          this.frameRateLastSample?.close();
          this.frameRateLastSample = videoSample.clone();
          this.frameRateLastTimestamp = alignedTimestamp;
          this.frameRateLastEndTimestamp = originalEndTimestamp;
        }
        await this.processAndEncode(videoSample, encodeOptions);
      } finally {
        if (shouldClose) {
          videoSample.close();
        }
      }
    }
    /**
     * Runs the process function (if any) and encodes the resulting samples.
     */
    async processAndEncode(videoSample, encodeOptions) {
      const config = this.encodingConfig;
      let samplesToEncode;
      if (config.transform?.process) {
        let processed = config.transform.process(videoSample);
        if (processed instanceof Promise) {
          processed = await processed;
        }
        if (processed === null) {
          return;
        }
        if (!Array.isArray(processed)) {
          processed = [processed];
        }
        const mappedSamples = [];
        try {
          for (const x of processed) {
            if (x instanceof VideoSample) {
              mappedSamples.push(x);
            } else if (typeof VideoFrame !== "undefined" && x instanceof VideoFrame) {
              mappedSamples.push(new VideoSample(x));
            } else {
              mappedSamples.push(new VideoSample(x, {
                timestamp: videoSample.timestamp,
                duration: videoSample.duration
              }));
            }
          }
        } catch (error) {
          for (const sample of mappedSamples) {
            if (sample !== videoSample) {
              sample.close();
            }
          }
          for (const x of processed) {
            if (x instanceof VideoSample && x !== videoSample) {
              x.close();
            } else if (typeof VideoFrame !== "undefined" && x instanceof VideoFrame) {
              x.close();
            }
          }
          throw error;
        }
        samplesToEncode = mappedSamples;
      } else {
        samplesToEncode = [videoSample];
      }
      try {
        for (const sampleToEncode of samplesToEncode) {
          if (!this.encoderInitialized) {
            if (!this.ensureEncoderPromise) {
              this.ensureEncoder(sampleToEncode);
            }
            if (!this.encoderInitialized) {
              await this.ensureEncoderPromise;
            }
          }
          assert(this.encoderInitialized);
          if (this.closed) {
            break;
          }
          const keyFrameInterval = this.encodingConfig.keyFrameInterval ?? 2;
          const multipleOfKeyFrameInterval = Math.floor(sampleToEncode.timestamp / keyFrameInterval);
          const mergedEncodeOptions = {
            ...this.defaultEncodeOptions,
            ...sampleToEncode.encodeOptions,
            ...encodeOptions
          };
          const finalEncodeOptions = {
            ...mergedEncodeOptions,
            keyFrame: mergedEncodeOptions.keyFrame !== void 0 ? mergedEncodeOptions.keyFrame : keyFrameInterval === 0 || multipleOfKeyFrameInterval !== this.lastMultipleOfKeyFrameInterval
          };
          this.lastMultipleOfKeyFrameInterval = multipleOfKeyFrameInterval;
          this.encodingConfig.onEncodedSample?.(sampleToEncode);
          if (this.customEncoder) {
            this.customEncoderQueueSize++;
            const clonedSample = sampleToEncode.clone();
            const promise = this.customEncoderCallSerializer.call(() => this.customEncoder.encode(clonedSample, finalEncodeOptions)).catch((error) => this.setError(error)).finally(() => {
              this.customEncoderQueueSize--;
              clonedSample.close();
            });
            if (this.customEncoderQueueSize >= 4) {
              await promise;
            }
          } else {
            assert(this.encoder);
            const videoFrame = sampleToEncode.toVideoFrame();
            const preciseTimingIndex = binarySearchLessOrEqual(
              this.preciseTimings,
              videoFrame.timestamp,
              (x) => x.microsecondTimestamp
            );
            const existingEntry = preciseTimingIndex !== -1 ? this.preciseTimings[preciseTimingIndex] : null;
            if (existingEntry && existingEntry.microsecondTimestamp === videoFrame.timestamp) {
              if (existingEntry.timestamp !== sampleToEncode.timestamp) {
                existingEntry.timestampIsValid = false;
              }
              if (existingEntry.duration !== sampleToEncode.duration) {
                existingEntry.durationIsValid = false;
              }
            } else {
              this.preciseTimings.splice(preciseTimingIndex + 1, 0, {
                microsecondTimestamp: videoFrame.timestamp,
                timestamp: sampleToEncode.timestamp,
                duration: sampleToEncode.duration,
                timestampIsValid: true,
                durationIsValid: true
              });
              if (this.preciseTimings.length > 128) {
                this.preciseTimings.shift();
              }
            }
            if (!this.alphaEncoder) {
              try {
                this.encoder.encode(videoFrame, finalEncodeOptions);
              } finally {
                videoFrame.close();
              }
            } else {
              const frameDefinitelyHasNoAlpha = !!videoFrame.format && !videoFrame.format.includes("A");
              if (frameDefinitelyHasNoAlpha || this.splitterCreationFailed) {
                this.alphaFrameQueue.push(null);
                try {
                  this.encoder.encode(videoFrame, finalEncodeOptions);
                } finally {
                  videoFrame.close();
                }
              } else {
                if (!this.splitter) {
                  this.splitter = new ColorAlphaSplitter();
                }
                const { colorFrame, alphaFrame } = await this.splitter.split(videoFrame);
                this.alphaFrameQueue.push(alphaFrame);
                try {
                  this.encoder.encode(colorFrame, finalEncodeOptions);
                } finally {
                  colorFrame.close();
                }
              }
            }
            if (this.encoder.encodeQueueSize >= 4) {
              await new Promise(
                (resolve) => this.encoder.addEventListener("dequeue", resolve, { once: true })
              );
            }
          }
          await this.lastMuxerPromise;
        }
      } finally {
        for (const sample of samplesToEncode) {
          if (sample !== videoSample) {
            sample.close();
          }
        }
      }
    }
    /** Repeats the last frame rate sample to fill the gap up to the given timestamp. */
    async padFrameRate(until, encodeOptions) {
      const frameRate = this.encodingConfig.transform.frameRate;
      assert(this.frameRateLastSample);
      const frameDifference = Math.round((until - this.frameRateLastTimestamp) * frameRate);
      for (let i = 1; i < frameDifference; i++) {
        var _stack = [];
        try {
          const sample = __using(_stack, this.frameRateLastSample.clone());
          sample.setTimestamp(this.frameRateLastTimestamp + i / frameRate);
          sample.setDuration(1 / frameRate);
          await this.processAndEncode(sample, encodeOptions);
        } catch (_) {
          var _error = _, _hasError = true;
        } finally {
          __callDispose(_stack, _error, _hasError);
        }
      }
    }
    ensureEncoder(videoSample) {
      this.ensureEncoderPromise = (async () => {
        const quality = resolveQuality(this.encodingConfig.quality, this.encodingConfig.bitrate);
        assert(quality !== void 0);
        const candidates = buildVideoEncoderConfigs({
          ...this.encodingConfig,
          quality,
          width: videoSample.codedWidth,
          height: videoSample.codedHeight,
          squarePixelWidth: videoSample.squarePixelWidth,
          squarePixelHeight: videoSample.squarePixelHeight,
          framerate: this.source._connectedTrack?.metadata.frameRate
        });
        let selected = null;
        let MatchingCustomEncoder;
        for (const candidate of candidates) {
          const candidateConfig = candidate.config;
          this.encodingConfig.onEncoderConfig?.(candidateConfig);
          MatchingCustomEncoder = customVideoEncoders.find((x) => x.supports(
            this.encodingConfig.codec,
            candidateConfig
          ));
          if (MatchingCustomEncoder) {
            selected = candidate;
            break;
          }
          if (typeof VideoEncoder === "undefined") {
            continue;
          }
          candidateConfig.alpha = "discard";
          if (this.encodingConfig.alpha === "keep") {
            candidateConfig.latencyMode = "quality";
          }
          const hasOddDimension = candidateConfig.width % 2 === 1 || candidateConfig.height % 2 === 1;
          if (hasOddDimension && (this.encodingConfig.codec === "avc" || this.encodingConfig.codec === "hevc")) {
            throw new Error(
              `The dimensions ${candidateConfig.width}x${candidateConfig.height} are not supported for codec '${this.encodingConfig.codec}'; both width and height must be even numbers. Make sure to round your dimensions to the nearest even number.`
            );
          }
          try {
            const support = await VideoEncoder.isConfigSupported(candidateConfig);
            if (support.supported) {
              selected = candidate;
              break;
            }
          } catch {
          }
        }
        if (!selected) {
          if (typeof VideoEncoder === "undefined") {
            throw new Error("VideoEncoder is not supported by this browser.");
          }
          const firstConfig = candidates[0].config;
          const rateControls = candidates.map(
            ({ config, quantizer }) => quantizer !== null ? `quantizer ${quantizer}` : `${config.bitrate} bps`
          );
          throw new Error(
            `This specific encoder configuration (${firstConfig.codec}, ${rateControls.join(" / ")}, ${firstConfig.width}x${firstConfig.height}, hardware acceleration: ${firstConfig.hardwareAcceleration ?? "no-preference"}) is not supported by this browser. Consider using another codec or changing your video parameters.`
          );
        }
        const encoderConfig = selected.config;
        if (selected.quantizer !== null) {
          this.defaultEncodeOptions = buildQuantizerEncodeOptions(
            this.encodingConfig.codec,
            selected.quantizer
          );
        }
        if (MatchingCustomEncoder) {
          this.customEncoder = new MatchingCustomEncoder();
          this.customEncoder.codec = this.encodingConfig.codec;
          this.customEncoder.config = encoderConfig;
          this.customEncoder.onPacket = (packet, meta) => {
            if (!(packet instanceof EncodedPacket)) {
              throw new TypeError("The first argument passed to onPacket must be an EncodedPacket.");
            }
            if (meta !== void 0 && (!meta || typeof meta !== "object")) {
              throw new TypeError("The second argument passed to onPacket must be an object or undefined.");
            }
            maybeEnsureIsKeyPacket(this.source._connectedTrack, packet);
            this.encodingConfig.onEncodedPacket?.(packet, meta);
            this.lastMuxerPromise = this.muxer.addEncodedVideoPacket(this.source._connectedTrack, packet, meta).catch((error) => {
              this.setError(error);
            });
          };
          this.customEncoder.onError = (error) => {
            this.setError(error);
          };
          await this.customEncoder.init();
        } else {
          const colorChunkQueue = [];
          const nullAlphaChunkQueue = [];
          let encodedAlphaChunkCount = 0;
          let alphaEncoderQueue = 0;
          const addPacket = (colorChunk, alphaChunk, meta) => {
            const sideData = {};
            if (alphaChunk) {
              const alphaData = new Uint8Array(alphaChunk.byteLength);
              alphaChunk.copyTo(alphaData);
              sideData.alpha = alphaData;
            }
            let packet = EncodedPacket.fromEncodedChunk(colorChunk, sideData);
            const preciseTimingIndex = binarySearchLessOrEqual(
              this.preciseTimings,
              colorChunk.timestamp,
              (x) => x.microsecondTimestamp
            );
            const entry = preciseTimingIndex !== -1 ? this.preciseTimings[preciseTimingIndex] : null;
            let actualType = null;
            if (this.emittedEncoderPackets === 0 && packet.type === "delta" && meta?.decoderConfig) {
              actualType = determineVideoPacketType(
                this.encodingConfig.codec,
                meta.decoderConfig,
                packet.data
              );
            }
            if (entry && entry.microsecondTimestamp === colorChunk.timestamp || actualType !== null) {
              packet = packet.clone({
                timestamp: entry?.timestampIsValid ? entry.timestamp : void 0,
                duration: entry?.durationIsValid ? entry.duration : void 0,
                type: actualType ?? void 0
              });
            }
            maybeEnsureIsKeyPacket(this.source._connectedTrack, packet);
            this.encodingConfig.onEncodedPacket?.(packet, meta);
            this.lastMuxerPromise = this.muxer.addEncodedVideoPacket(this.source._connectedTrack, packet, meta).catch((error) => {
              this.setError(error);
            });
            this.emittedEncoderPackets++;
          };
          const stack = new Error("Encoding error").stack;
          this.encoder = new VideoEncoder({
            output: (chunk, meta) => {
              if (!this.alphaEncoder) {
                addPacket(chunk, null, meta);
                return;
              }
              const alphaFrame = this.alphaFrameQueue.shift();
              assert(alphaFrame !== void 0);
              if (alphaFrame) {
                this.alphaEncoder.encode(alphaFrame, {
                  ...this.defaultEncodeOptions,
                  // Crucial: The alpha frame is forced to be a key frame whenever the color frame
                  // also is. Without this, playback can glitch and even crash in some browsers.
                  // This is the reason why the two encoders are wired in series and not in parallel.
                  keyFrame: chunk.type === "key"
                });
                alphaEncoderQueue++;
                alphaFrame.close();
                colorChunkQueue.push({ chunk, meta });
              } else {
                if (alphaEncoderQueue === 0) {
                  addPacket(chunk, null, meta);
                } else {
                  nullAlphaChunkQueue.push(encodedAlphaChunkCount + alphaEncoderQueue);
                  colorChunkQueue.push({ chunk, meta });
                }
              }
            },
            error: (error) => {
              error.stack = stack;
              this.setError(error);
            }
          });
          this.encoder.configure(encoderConfig);
          if (this.encodingConfig.alpha === "keep") {
            const stack2 = new Error("Encoding error").stack;
            this.alphaEncoder = new VideoEncoder({
              // We ignore the alpha chunk's metadata
              // eslint-disable-next-line @typescript-eslint/no-unused-vars
              output: (chunk, meta) => {
                alphaEncoderQueue--;
                const colorChunk = colorChunkQueue.shift();
                assert(colorChunk !== void 0);
                addPacket(colorChunk.chunk, chunk, colorChunk.meta);
                encodedAlphaChunkCount++;
                while (nullAlphaChunkQueue.length > 0 && nullAlphaChunkQueue[0] === encodedAlphaChunkCount) {
                  nullAlphaChunkQueue.shift();
                  const colorChunk2 = colorChunkQueue.shift();
                  assert(colorChunk2 !== void 0);
                  addPacket(colorChunk2.chunk, null, colorChunk2.meta);
                }
              },
              error: (error) => {
                error.stack = stack2;
                this.setError(error);
              }
            });
            this.alphaEncoder.configure(encoderConfig);
          }
        }
        assert(this.source._connectedTrack);
        this.muxer = this.source._connectedTrack.output._muxer;
        this.encoderInitialized = true;
      })();
    }
    async flushAndClose(forceClose) {
      try {
        if (!forceClose) {
          this.checkForEncoderError();
          if (this.frameRateLastSample) {
            const frameRate = this.encodingConfig.transform.frameRate;
            const alignedEnd = floorToDivisor(this.frameRateLastEndTimestamp, frameRate);
            await this.padFrameRate(alignedEnd);
          }
        }
        this.closed = true;
        if (!forceClose) {
          if (this.customEncoder) {
            void this.customEncoderCallSerializer.call(() => this.customEncoder.flush());
          } else if (this.encoder) {
            await this.encoder.flush();
            await this.alphaEncoder?.flush();
            await wait(25);
          }
        }
      } finally {
        this.closed = true;
        this.frameRateLastSample?.close();
        this.frameRateLastSample = null;
        if (this.customEncoder) {
          await this.customEncoderCallSerializer.call(() => this.customEncoder.close()).catch((error) => this.setError(error));
        } else if (this.encoder) {
          if (this.encoder.state !== "closed") {
            this.encoder.close();
          }
          if (this.alphaEncoder && this.alphaEncoder.state !== "closed") {
            this.alphaEncoder.close();
          }
          this.alphaFrameQueue.forEach((x) => x?.close());
          this.alphaFrameQueue.length = 0;
          this.splitter?.close();
        }
      }
      if (!forceClose) {
        this.checkForEncoderError();
      }
    }
    getQueueSize() {
      if (this.customEncoder) {
        return this.customEncoderQueueSize;
      } else {
        return this.encoder?.encodeQueueSize ?? 0;
      }
    }
    checkForEncoderError() {
      if (this.errorSet) {
        throw this.error;
      }
    }
  };
  var splitterWorkerUrl = null;
  var ColorAlphaSplitter = class {
    constructor() {
      this.worker = null;
      this.pendingRequests = /* @__PURE__ */ new Map();
      this.nextRequestId = 0;
    }
    split(sourceFrame) {
      if (!this.worker) {
        if (!splitterWorkerUrl) {
          const blob = new Blob(
            [`(${colorAlphaSplitterWorkerCode.toString()})()`],
            { type: "application/javascript" }
          );
          splitterWorkerUrl = URL.createObjectURL(blob);
        }
        this.worker = new Worker(splitterWorkerUrl);
        this.worker.addEventListener("message", (event) => {
          const data = event.data;
          const pending2 = this.pendingRequests.get(data.id);
          if (!pending2) {
            return;
          }
          this.pendingRequests.delete(data.id);
          if ("error" in data) {
            pending2.reject(new Error(data.error));
          } else {
            pending2.resolve({ colorFrame: data.colorFrame, alphaFrame: data.alphaFrame });
          }
        });
        this.worker.addEventListener("error", (event) => {
          const error = new Error(event.message || "Color/alpha splitter worker error.");
          for (const pending2 of this.pendingRequests.values()) {
            pending2.reject(error);
          }
          this.pendingRequests.clear();
        });
      }
      const id = this.nextRequestId++;
      const pending = promiseWithResolvers();
      this.pendingRequests.set(id, pending);
      this.worker.postMessage({ id, sourceFrame }, { transfer: [sourceFrame] });
      return pending.promise;
    }
    close() {
      this.worker?.terminate();
      this.worker = null;
      const error = new Error("Color/alpha splitter closed.");
      for (const pending of this.pendingRequests.values()) {
        pending.reject(error);
      }
      this.pendingRequests.clear();
    }
  };
  var colorAlphaSplitterWorkerCode = () => {
    let cpuSourceBuffer = null;
    let chain = Promise.resolve();
    self.addEventListener("message", (event) => {
      const { id, sourceFrame } = event.data;
      chain = chain.then(async () => {
        try {
          const { colorFrame, alphaFrame } = await split(sourceFrame);
          self.postMessage({ id, colorFrame, alphaFrame }, { transfer: [colorFrame, alphaFrame] });
        } catch (error) {
          self.postMessage({ id, error: error.message });
        } finally {
          sourceFrame.close();
        }
      });
    });
    const split = async (sourceFrame) => {
      const format = sourceFrame.format;
      if (!format) {
        throw new Error("CPU color/alpha splitting requires a known VideoFrame format.");
      }
      const sourceSize = sourceFrame.allocationSize();
      if (!cpuSourceBuffer || cpuSourceBuffer.byteLength !== sourceSize) {
        cpuSourceBuffer = new Uint8Array(sourceSize);
      }
      await sourceFrame.copyTo(cpuSourceBuffer);
      if (format === "RGBA" || format === "BGRA") {
        return splitInterleavedRgba(cpuSourceBuffer, format, sourceFrame);
      } else if (format === "I420A" || format === "I420AP10" || format === "I420AP12" || format === "I422A" || format === "I422AP10" || format === "I422AP12" || format === "I444A" || format === "I444AP10" || format === "I444AP12") {
        return splitPlanarYuvA(cpuSourceBuffer, format, sourceFrame);
      }
      throw new Error(`CPU color/alpha splitting does not support format '${format}'.`);
    };
    const splitInterleavedRgba = (source, format, sourceFrame) => {
      const width = sourceFrame.visibleRect?.width ?? sourceFrame.codedWidth;
      const height = sourceFrame.visibleRect?.height ?? sourceFrame.codedHeight;
      const pixelCount = width * height;
      const chromaW = Math.ceil(width / 2);
      const chromaH = Math.ceil(height / 2);
      const alphaSize = pixelCount + chromaW * chromaH * 2;
      const alphaBuffer = new Uint8Array(alphaSize);
      for (let i = 0, j = 3; i < pixelCount; i++, j += 4) {
        alphaBuffer[i] = source[j];
      }
      alphaBuffer.fill(128, pixelCount);
      const colorFrame = new VideoFrame(source, {
        format: format === "RGBA" ? "RGBX" : "BGRX",
        codedWidth: width,
        codedHeight: height,
        timestamp: sourceFrame.timestamp,
        duration: sourceFrame.duration ?? void 0
        // No transfer!
      });
      const alphaInit = {
        format: "I420",
        codedWidth: width,
        codedHeight: height,
        timestamp: sourceFrame.timestamp,
        duration: sourceFrame.duration ?? void 0,
        transfer: [alphaBuffer.buffer]
      };
      const alphaFrame = new VideoFrame(alphaBuffer, alphaInit);
      return { colorFrame, alphaFrame };
    };
    const splitPlanarYuvA = (source, format, sourceFrame) => {
      const width = sourceFrame.visibleRect?.width ?? sourceFrame.codedWidth;
      const height = sourceFrame.visibleRect?.height ?? sourceFrame.codedHeight;
      const is10 = format.includes("P10");
      const is12 = format.includes("P12");
      const bytesPerSample = is10 || is12 ? 2 : 1;
      let chromaW;
      let chromaH;
      if (format.startsWith("I420")) {
        chromaW = Math.ceil(width / 2);
        chromaH = Math.ceil(height / 2);
      } else if (format.startsWith("I422")) {
        chromaW = Math.ceil(width / 2);
        chromaH = height;
      } else {
        chromaW = width;
        chromaH = height;
      }
      const ySamples = width * height;
      const uvSamples = chromaW * chromaH;
      const yBytes = ySamples * bytesPerSample;
      const uvBytes = uvSamples * bytesPerSample;
      const aBytes = ySamples * bytesPerSample;
      const colorBytes = yBytes + uvBytes * 2;
      const colorFormat = format.replace("A", "");
      const alphaChromaW = Math.ceil(width / 2);
      const alphaChromaH = Math.ceil(height / 2);
      const alphaUvSamples = alphaChromaW * alphaChromaH;
      const alphaUvBytes = alphaUvSamples * bytesPerSample;
      const alphaSize = aBytes + 2 * alphaUvBytes;
      const alphaBuffer = new Uint8Array(alphaSize);
      const aPlaneStart = colorBytes;
      alphaBuffer.set(source.subarray(aPlaneStart, aPlaneStart + aBytes), 0);
      const uvOffset = aBytes;
      const neutralChroma = is10 ? 512 : is12 ? 2048 : 128;
      if (bytesPerSample === 1) {
        alphaBuffer.fill(neutralChroma, uvOffset);
      } else {
        const uvView = new Uint16Array(alphaBuffer.buffer, uvOffset, 2 * alphaUvSamples);
        uvView.fill(neutralChroma);
      }
      const alphaFormat = is10 ? "I420P10" : is12 ? "I420P12" : "I420";
      const colorFrame = new VideoFrame(source.subarray(0, colorBytes), {
        format: colorFormat,
        codedWidth: width,
        codedHeight: height,
        timestamp: sourceFrame.timestamp,
        duration: sourceFrame.duration ?? void 0
      });
      const alphaInit = {
        format: alphaFormat,
        codedWidth: width,
        codedHeight: height,
        timestamp: sourceFrame.timestamp,
        duration: sourceFrame.duration ?? void 0,
        transfer: [alphaBuffer.buffer]
      };
      const alphaFrame = new VideoFrame(alphaBuffer, alphaInit);
      return { colorFrame, alphaFrame };
    };
  };
  var VideoSampleSource = class extends VideoSource {
    /**
     * Creates a new {@link VideoSampleSource} whose samples are encoded according to the specified
     * {@link VideoEncodingConfig}.
     */
    constructor(encodingConfig) {
      validateVideoEncodingConfig(encodingConfig);
      super(encodingConfig.codec);
      this._encoder = new VideoEncoderWrapper(this, encodingConfig);
    }
    /**
     * Encodes a video sample (frame) and then adds it to the output.
     *
     * @returns A Promise that resolves once the output is ready to receive more samples. You should await this Promise
     * to respect writer and encoder backpressure.
     */
    add(videoSample, encodeOptions) {
      if (!(videoSample instanceof VideoSample)) {
        throw new TypeError("videoSample must be a VideoSample.");
      }
      return this._encoder.add(videoSample, false, encodeOptions);
    }
    /** @internal */
    _flushAndClose(forceClose) {
      return this._encoder.flushAndClose(forceClose);
    }
  };
  var CanvasSource = class extends VideoSource {
    /**
     * Creates a new {@link CanvasSource} from a canvas element or `OffscreenCanvas` whose samples are encoded
     * according to the specified {@link VideoEncodingConfig}.
     */
    constructor(canvas, encodingConfig) {
      if (!(typeof HTMLCanvasElement !== "undefined" && canvas instanceof HTMLCanvasElement) && !(typeof OffscreenCanvas !== "undefined" && canvas instanceof OffscreenCanvas)) {
        throw new TypeError("canvas must be an HTMLCanvasElement or OffscreenCanvas.");
      }
      validateVideoEncodingConfig(encodingConfig);
      super(encodingConfig.codec);
      this._encoder = new VideoEncoderWrapper(this, encodingConfig);
      this._canvas = canvas;
    }
    /**
     * Captures the current canvas state as a video sample (frame), encodes it and adds it to the output.
     *
     * @param timestamp - The timestamp of the sample, in seconds.
     * @param duration - The duration of the sample, in seconds.
     *
     * @returns A Promise that resolves once the output is ready to receive more samples. You should await this Promise
     * to respect writer and encoder backpressure.
     */
    add(timestamp, duration = 0, encodeOptions) {
      if (!Number.isFinite(timestamp) || timestamp < 0) {
        throw new TypeError("timestamp must be a non-negative number.");
      }
      if (!Number.isFinite(duration) || duration < 0) {
        throw new TypeError("duration must be a non-negative number.");
      }
      const sample = new VideoSample(this._canvas, { timestamp, duration });
      return this._encoder.add(sample, true, encodeOptions);
    }
    /** @internal */
    _flushAndClose(forceClose) {
      return this._encoder.flushAndClose(forceClose);
    }
  };
  var MediaStreamVideoTrackSource = class extends VideoSource {
    /**
     * Creates a new {@link MediaStreamVideoTrackSource} from a
     * [`MediaStreamVideoTrack`](https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack), which will pull
     * video samples from the stream in real time and encode them according to {@link VideoEncodingConfig}.
     */
    constructor(track, encodingConfig, options = {}) {
      if (!(track instanceof MediaStreamTrack) || track.kind !== "video") {
        throw new TypeError("track must be a video MediaStreamTrack.");
      }
      validateVideoEncodingConfig(encodingConfig);
      if (typeof options !== "object" || !options) {
        throw new TypeError("options must be an object.");
      }
      if (options.frameRate != null && (typeof options.frameRate !== "number" || options.frameRate <= 0)) {
        throw new TypeError("options.frameRate, when provided, must be either a positive number or null.");
      }
      if (options.timestampBase !== void 0 && options.timestampBase !== "synced-zero" && options.timestampBase !== "zero" && options.timestampBase !== "unix") {
        throw new TypeError(
          "options.timestampBase, when provided, must be one of 'synced-zero', 'zero', or 'unix'."
        );
      }
      encodingConfig = {
        ...encodingConfig,
        latencyMode: "realtime"
      };
      super(encodingConfig.codec);
      /** @internal */
      this._abortController = null;
      /** @internal */
      this._workerTrackId = null;
      /** @internal */
      this._workerListener = null;
      /** @internal */
      this._promiseWithResolvers = promiseWithResolvers();
      /** @internal */
      this._errorPromiseAccessed = false;
      /** @internal */
      this._paused = false;
      /** @internal */
      this._lastVideoFrame = null;
      /** @internal */
      this._timerHandle = null;
      /** @internal */
      this._videoElement = null;
      this._options = options;
      this._encoder = new VideoEncoderWrapper(this, encodingConfig);
      this._track = track;
    }
    /** A promise that rejects upon any error within this source. This promise never resolves. */
    get errorPromise() {
      this._errorPromiseAccessed = true;
      return this._promiseWithResolvers.promise;
    }
    /** Whether this source is currently paused as a result of calling `.pause()`. */
    get paused() {
      return this._paused;
    }
    /** @internal */
    async _start() {
      if (!this._errorPromiseAccessed) {
        Logging._warn(
          "Make sure not to ignore the `errorPromise` field on MediaStreamVideoTrackSource, so that any internal errors get bubbled up properly."
        );
      }
      const frameRate = this._options.frameRate !== void 0 ? this._options.frameRate : this._track.getSettings().frameRate ?? null;
      this._abortController = new AbortController();
      let firstVideoFrameTimestamp = null;
      let lastFrameTime = null;
      let frameCount = 0;
      let errored = false;
      let lastSampleTimestamp = null;
      let timestampOffset = 0;
      const tick = () => {
        assert(frameRate !== null);
        if (!this._lastVideoFrame) {
          return;
        }
        assert(lastFrameTime !== null);
        assert(firstVideoFrameTimestamp !== null);
        const now = performance.now();
        while (now - lastFrameTime > 1e3 / frameRate) {
          lastFrameTime += 1e3 / frameRate;
          const timestamp = firstVideoFrameTimestamp + frameCount / frameRate;
          const frame = new VideoFrame(this._videoElement ?? this._lastVideoFrame, {
            timestamp: 1e6 * timestamp,
            duration: 1e6 / frameRate
          });
          addVideoFrame(frame, now);
        }
      };
      if (frameRate !== null) {
        this._timerHandle = setIntervalUnthrottled(tick, 4);
      }
      const onVideoFrame = (videoFrame) => {
        if (frameRate === null) {
          addVideoFrame(videoFrame);
        } else {
          const now = performance.now();
          if (!this._lastVideoFrame) {
            addVideoFrame(videoFrame.clone(), now);
            lastFrameTime = now;
            this._lastVideoFrame = videoFrame;
          } else {
            tick();
            this._lastVideoFrame?.close();
            this._lastVideoFrame = videoFrame;
          }
        }
      };
      const addVideoFrame = (videoFrame, now = performance.now()) => {
        if (errored) {
          videoFrame.close();
          return;
        }
        frameCount++;
        const currentTimestamp = videoFrame.timestamp / 1e6;
        if (this._paused) {
          const frameSeen = firstVideoFrameTimestamp !== null;
          if (frameSeen) {
            if (lastSampleTimestamp !== null && this._options.timestampBase !== "unix") {
              const timeDelta = currentTimestamp - lastSampleTimestamp;
              timestampOffset -= timeDelta;
            }
            lastSampleTimestamp = currentTimestamp;
          }
          videoFrame.close();
          return;
        }
        if (firstVideoFrameTimestamp === null) {
          firstVideoFrameTimestamp = currentTimestamp;
          let target;
          const timestampBase = this._options.timestampBase ?? "synced-zero";
          if (timestampBase === "unix") {
            target = Date.now() / 1e3;
          } else if (timestampBase === "zero") {
            target = 0;
          } else {
            const output = this._connectedTrack.output;
            if (output._firstMediaStreamTimestamp === null) {
              output._firstMediaStreamTimestamp = now / 1e3;
              target = 0;
            } else {
              target = now / 1e3 - output._firstMediaStreamTimestamp;
            }
          }
          timestampOffset = target - firstVideoFrameTimestamp;
        }
        lastSampleTimestamp = currentTimestamp;
        if (this._encoder.getQueueSize() >= 8) {
          videoFrame.close();
          return;
        }
        const sample = new VideoSample(videoFrame, {
          timestamp: currentTimestamp + timestampOffset
        });
        void this._encoder.add(sample, true).catch((error) => {
          errored = true;
          this._abortController?.abort();
          this._promiseWithResolvers.reject(error);
          if (this._workerTrackId !== null) {
            sendMessageToMediaStreamTrackProcessorWorker({
              type: "stopTrack",
              trackId: this._workerTrackId
            });
          }
        });
      };
      if (typeof MediaStreamTrackProcessor !== "undefined") {
        const processor = new MediaStreamTrackProcessor({ track: this._track });
        const consumer = new WritableStream({ write: onVideoFrame });
        processor.readable.pipeTo(consumer, {
          signal: this._abortController.signal
        }).catch((error) => {
          if (error instanceof DOMException && error.name === "AbortError") return;
          this._promiseWithResolvers.reject(error);
        });
      } else {
        const supportedInWorker = await mediaStreamTrackProcessorIsSupportedInWorker();
        if (supportedInWorker) {
          this._workerTrackId = nextMediaStreamTrackProcessorWorkerId++;
          sendMessageToMediaStreamTrackProcessorWorker({
            type: "videoTrack",
            trackId: this._workerTrackId,
            track: this._track
          });
          this._workerListener = (event) => {
            const message = event.data;
            if (message.type === "videoFrame" && message.trackId === this._workerTrackId) {
              onVideoFrame(message.videoFrame);
            } else if (message.type === "error" && message.trackId === this._workerTrackId) {
              this._promiseWithResolvers.reject(message.error);
            }
          };
          mediaStreamTrackProcessorWorker.addEventListener("message", this._workerListener);
        } else if (frameRate !== null) {
          const video = document.createElement("video");
          video.style.position = "fixed";
          video.style.left = "-10000px";
          video.style.top = "-10000px";
          video.style.width = "1px";
          video.style.height = "1px";
          video.style.opacity = "0";
          video.style.pointerEvents = "none";
          video.muted = true;
          video.srcObject = new MediaStream([this._track]);
          document.body.appendChild(video);
          this._videoElement = video;
          video.addEventListener("loadeddata", () => {
            if (errored || !this._videoElement) {
              return;
            }
            const frame = new VideoFrame(video, {
              timestamp: 1e3 * performance.now()
            });
            onVideoFrame(frame);
            frame.close();
          }, { once: true });
          void video.play().catch((error) => {
            errored = true;
            this._promiseWithResolvers.reject(error);
          });
        } else {
          throw new Error(
            "When no explicit frame rate is set, MediaStreamTrackProcessor is required; but it's not supported by this browser."
          );
        }
      }
    }
    /**
     * Pauses the capture of video frames - any video frames emitted by the underlying media stream will be ignored
     * while paused. This does *not* close the underlying `MediaStreamVideoTrack`, it just ignores its output.
     */
    pause() {
      this._paused = true;
    }
    /** Resumes the capture of video frames after being paused. */
    resume() {
      this._paused = false;
    }
    /** @internal */
    async _flushAndClose(forceClose) {
      if (this._abortController) {
        this._abortController.abort();
        this._abortController = null;
      }
      if (this._timerHandle) {
        clearIntervalUnthrottled(this._timerHandle);
      }
      this._lastVideoFrame?.close();
      if (this._videoElement) {
        this._videoElement.srcObject = null;
        this._videoElement.remove();
        this._videoElement = null;
      }
      if (this._workerTrackId !== null) {
        assert(this._workerListener);
        sendMessageToMediaStreamTrackProcessorWorker({
          type: "stopTrack",
          trackId: this._workerTrackId
        });
        await new Promise((resolve) => {
          const listener = (event) => {
            const message = event.data;
            if (message.type === "trackStopped" && message.trackId === this._workerTrackId) {
              assert(this._workerListener);
              mediaStreamTrackProcessorWorker.removeEventListener("message", this._workerListener);
              mediaStreamTrackProcessorWorker.removeEventListener("message", listener);
              resolve();
            }
          };
          mediaStreamTrackProcessorWorker.addEventListener("message", listener);
        });
      }
      await this._encoder.flushAndClose(forceClose);
    }
  };
  var AudioSource = class extends MediaSource {
    /** Internal constructor. */
    constructor(codec) {
      super();
      /** @internal */
      this._connectedTrack = null;
      if (!AUDIO_CODECS.includes(codec)) {
        throw new TypeError(`Invalid audio codec '${codec}'. Must be one of: ${AUDIO_CODECS.join(", ")}.`);
      }
      this._codec = codec;
    }
  };
  var EncodedAudioPacketSource = class extends AudioSource {
    /** Creates a new {@link EncodedAudioPacketSource} whose packets are encoded using `codec`. */
    constructor(codec) {
      super(codec);
    }
    /**
     * Adds an encoded packet to the output audio track. Packets must be added in *decode order*.
     *
     * @param meta - Additional metadata from the encoder. You should pass this for the first call, including a valid
     * decoder config.
     *
     * @returns A Promise that resolves once the output is ready to receive more samples. You should await this Promise
     * to respect writer and encoder backpressure.
     */
    add(packet, meta) {
      if (!(packet instanceof EncodedPacket)) {
        throw new TypeError("packet must be an EncodedPacket.");
      }
      if (packet.isMetadataOnly) {
        throw new TypeError("Metadata-only packets cannot be added.");
      }
      if (meta !== void 0 && (!meta || typeof meta !== "object")) {
        throw new TypeError("meta, when provided, must be an object.");
      }
      this._ensureValidAdd();
      return this._connectedTrack.output._muxer.addEncodedAudioPacket(this._connectedTrack, packet, meta);
    }
  };
  var AudioEncoderWrapper = class {
    constructor(source, encodingConfig) {
      this.source = source;
      this.encodingConfig = encodingConfig;
      this.ensureEncoderPromise = null;
      this.encoderInitialized = false;
      this.encoder = null;
      this.muxer = null;
      this.lastNumberOfChannels = null;
      this.lastSampleRate = null;
      this.isPcmEncoder = false;
      this.outputSampleSize = null;
      this.writeOutputValue = null;
      this.customEncoder = null;
      this.customEncoderCallSerializer = new CallSerializer();
      this.customEncoderQueueSize = 0;
      this.lastEndSampleIndex = null;
      this.resampler = null;
      /**
       * Encoders typically throw their errors "out of band", meaning asynchronously in some other execution context.
       * However, we want to surface these errors to the user within the normal control flow, so they don't go uncaught.
       * So, we keep track of the encoder error and throw it as soon as we get the chance.
       */
      this.error = null;
      this.errorSet = false;
      this.lastMuxerPromise = Promise.resolve();
      this.closed = false;
    }
    setError(error) {
      if (!this.errorSet) {
        this.error = error;
        this.errorSet = true;
      }
    }
    async add(audioSample, shouldClose) {
      try {
        this.checkForEncoderError();
        this.source._ensureValidAdd();
        if (this.lastNumberOfChannels !== null && this.lastSampleRate !== null) {
          if (audioSample.numberOfChannels !== this.lastNumberOfChannels || audioSample.sampleRate !== this.lastSampleRate) {
            throw new Error(
              `Audio parameters must remain constant. Expected ${this.lastNumberOfChannels} channels at ${this.lastSampleRate} Hz, got ${audioSample.numberOfChannels} channels at ${audioSample.sampleRate} Hz.`
            );
          }
        } else {
          this.lastNumberOfChannels = audioSample.numberOfChannels;
          this.lastSampleRate = audioSample.sampleRate;
        }
        const config = this.encodingConfig;
        const needsResample = config.transform?.numberOfChannels !== void 0 || config.transform?.sampleRate !== void 0;
        if (needsResample) {
          if (!this.resampler) {
            this.resampler = new AudioResampler({
              targetNumberOfChannels: config.transform.numberOfChannels ?? audioSample.numberOfChannels,
              targetSampleRate: config.transform.sampleRate ?? audioSample.sampleRate,
              onSample: async (sample) => {
                await this.processAndEncode(sample, true);
              }
            });
          }
          await this.resampler.add(audioSample);
        } else {
          await this.processAndEncode(audioSample, shouldClose);
        }
      } finally {
        if (shouldClose) {
          audioSample.close();
        }
      }
    }
    /**
     * Runs the process function (if any) and encodes the resulting samples.
     */
    async processAndEncode(audioSample, shouldClose) {
      const config = this.encodingConfig;
      if (config.transform?.sampleFormat !== void 0 && toInterleavedAudioFormat(audioSample.format) !== config.transform.sampleFormat) {
        const newSample = audioSampleToInterleavedFormat(audioSample, config.transform.sampleFormat);
        if (shouldClose) {
          audioSample.close();
        }
        audioSample = newSample;
        shouldClose = true;
      }
      if (config.transform?.process) {
        try {
          let processed = config.transform.process(audioSample);
          if (processed instanceof Promise) {
            processed = await processed;
          }
          if (processed === null) {
            return;
          }
          if (!Array.isArray(processed)) {
            processed = [processed];
          }
          try {
            for (const sample of processed) {
              if (!(sample instanceof AudioSample)) {
                throw new TypeError(
                  "The audio process function must return an AudioSample, null, or an array of AudioSamples."
                );
              }
            }
            for (const sample of processed) {
              await this.encodeSample(sample, true);
            }
          } finally {
            for (const sample of processed) {
              if (sample instanceof AudioSample) {
                sample.close();
              }
            }
          }
        } finally {
          if (shouldClose) {
            audioSample.close();
          }
        }
      } else {
        await this.encodeSample(audioSample, shouldClose);
      }
    }
    /**
     * Encodes a single audio sample, handling encoder init, gap padding, and backpressure.
     */
    async encodeSample(audioSample, shouldClose) {
      try {
        if (!this.encoderInitialized) {
          if (!this.ensureEncoderPromise) {
            this.ensureEncoder(audioSample);
          }
          if (!this.encoderInitialized) {
            await this.ensureEncoderPromise;
          }
        }
        assert(this.encoderInitialized);
        if (this.closed) {
          return;
        }
        {
          const startSampleIndex = Math.round(
            audioSample.timestamp * audioSample.sampleRate
          );
          const endSampleIndex = Math.round(
            (audioSample.timestamp + audioSample.duration) * audioSample.sampleRate
          );
          if (this.lastEndSampleIndex === null) {
            this.lastEndSampleIndex = endSampleIndex;
          } else {
            const sampleDiff = startSampleIndex - this.lastEndSampleIndex;
            if (sampleDiff >= 64) {
              const fillSample = new AudioSample({
                data: new Float32Array(sampleDiff * audioSample.numberOfChannels),
                format: "f32-planar",
                sampleRate: audioSample.sampleRate,
                numberOfChannels: audioSample.numberOfChannels,
                numberOfFrames: sampleDiff,
                timestamp: this.lastEndSampleIndex / audioSample.sampleRate
              });
              await this.encodeSample(fillSample, true);
            }
            this.lastEndSampleIndex += audioSample.numberOfFrames;
          }
        }
        this.encodingConfig.onEncodedSample?.(audioSample);
        if (this.customEncoder) {
          this.customEncoderQueueSize++;
          const clonedSample = audioSample.clone();
          const promise = this.customEncoderCallSerializer.call(() => this.customEncoder.encode(clonedSample)).catch((error) => this.setError(error)).finally(() => {
            this.customEncoderQueueSize--;
            clonedSample.close();
          });
          if (this.customEncoderQueueSize >= 4) {
            await promise;
          }
          await this.lastMuxerPromise;
        } else if (this.isPcmEncoder) {
          await this.doPcmEncoding(audioSample, shouldClose);
        } else {
          assert(this.encoder);
          const audioData = audioSample.toAudioData();
          this.encoder.encode(audioData);
          audioData.close();
          if (shouldClose) {
            audioSample.close();
          }
          if (this.encoder.encodeQueueSize >= 4) {
            await new Promise((resolve) => this.encoder.addEventListener("dequeue", resolve, { once: true }));
          }
          await this.lastMuxerPromise;
        }
      } finally {
        if (shouldClose) {
          audioSample.close();
        }
      }
    }
    async doPcmEncoding(audioSample, shouldClose) {
      assert(this.outputSampleSize);
      assert(this.writeOutputValue);
      const { numberOfChannels, numberOfFrames, sampleRate, timestamp } = audioSample;
      const CHUNK_SIZE = 2048;
      const outputs = [];
      for (let frame = 0; frame < numberOfFrames; frame += CHUNK_SIZE) {
        const frameCount = Math.min(CHUNK_SIZE, audioSample.numberOfFrames - frame);
        const outputSize = frameCount * numberOfChannels * this.outputSampleSize;
        const outputBuffer = new ArrayBuffer(outputSize);
        const outputView = new DataView(outputBuffer);
        outputs.push({ frameCount, view: outputView });
      }
      const allocationSize = audioSample.allocationSize({ planeIndex: 0, format: "f32-planar" });
      const floats = new Float32Array(allocationSize / Float32Array.BYTES_PER_ELEMENT);
      for (let i = 0; i < numberOfChannels; i++) {
        audioSample.copyTo(floats, { planeIndex: i, format: "f32-planar" });
        for (let j = 0; j < outputs.length; j++) {
          const { frameCount, view: view2 } = outputs[j];
          for (let k = 0; k < frameCount; k++) {
            this.writeOutputValue(
              view2,
              (k * numberOfChannels + i) * this.outputSampleSize,
              floats[j * CHUNK_SIZE + k]
            );
          }
        }
      }
      if (shouldClose) {
        audioSample.close();
      }
      const meta = {
        decoderConfig: {
          codec: this.encodingConfig.codec,
          numberOfChannels,
          sampleRate
        }
      };
      for (let i = 0; i < outputs.length; i++) {
        const { frameCount, view: view2 } = outputs[i];
        const outputBuffer = view2.buffer;
        const startFrame = i * CHUNK_SIZE;
        const packet = new EncodedPacket(
          new Uint8Array(outputBuffer),
          "key",
          timestamp + startFrame / sampleRate,
          frameCount / sampleRate
        );
        this.encodingConfig.onEncodedPacket?.(packet, meta);
        await this.muxer.addEncodedAudioPacket(this.source._connectedTrack, packet, meta);
      }
    }
    ensureEncoder(audioSample) {
      this.ensureEncoderPromise = (async () => {
        const { numberOfChannels, sampleRate } = audioSample;
        const quality = resolveQuality(this.encodingConfig.quality, this.encodingConfig.bitrate);
        const encoderConfig = buildAudioEncoderConfig({
          numberOfChannels,
          sampleRate,
          ...this.encodingConfig,
          quality
        });
        this.encodingConfig.onEncoderConfig?.(encoderConfig);
        const MatchingCustomEncoder = customAudioEncoders.find((x) => x.supports(
          this.encodingConfig.codec,
          encoderConfig
        ));
        if (MatchingCustomEncoder) {
          this.customEncoder = new MatchingCustomEncoder();
          this.customEncoder.codec = this.encodingConfig.codec;
          this.customEncoder.config = encoderConfig;
          this.customEncoder.onPacket = (packet, meta) => {
            if (!(packet instanceof EncodedPacket)) {
              throw new TypeError("The first argument passed to onPacket must be an EncodedPacket.");
            }
            if (meta !== void 0 && (!meta || typeof meta !== "object")) {
              throw new TypeError("The second argument passed to onPacket must be an object or undefined.");
            }
            this.encodingConfig.onEncodedPacket?.(packet, meta);
            this.lastMuxerPromise = this.muxer.addEncodedAudioPacket(this.source._connectedTrack, packet, meta).catch((error) => {
              this.setError(error);
            });
          };
          this.customEncoder.onError = (error) => {
            this.setError(error);
          };
          await this.customEncoder.init();
        } else if (PCM_AUDIO_CODECS.includes(this.encodingConfig.codec)) {
          this.initPcmEncoder();
        } else {
          if (typeof AudioEncoder === "undefined") {
            throw new Error("AudioEncoder is not supported by this browser.");
          }
          let supported;
          try {
            const support = await AudioEncoder.isConfigSupported(encoderConfig);
            supported = support.supported ?? false;
          } catch {
            supported = false;
          }
          if (!supported) {
            throw new Error(
              `This specific encoder configuration (${encoderConfig.codec}, ${encoderConfig.bitrate} bps, ${encoderConfig.numberOfChannels} channels, ${encoderConfig.sampleRate} Hz) is not supported by this browser. Consider using another codec or changing your audio parameters.`
            );
          }
          const stack = new Error("Encoding error").stack;
          this.encoder = new AudioEncoder({
            output: (chunk, meta) => {
              if (this.encodingConfig.codec === "aac" && meta?.decoderConfig) {
                let needsDescriptionOverwrite = false;
                if (!meta.decoderConfig.description || meta.decoderConfig.description.byteLength < 2) {
                  needsDescriptionOverwrite = true;
                } else {
                  const audioSpecificConfig = parseAacAudioSpecificConfig(
                    toUint8Array(meta.decoderConfig.description)
                  );
                  needsDescriptionOverwrite = audioSpecificConfig.objectType === 0;
                }
                if (needsDescriptionOverwrite) {
                  const objectType = Number(last(encoderConfig.codec.split(".")));
                  meta.decoderConfig.description = buildAacAudioSpecificConfig({
                    objectType,
                    numberOfChannels: meta.decoderConfig.numberOfChannels,
                    sampleRate: meta.decoderConfig.sampleRate
                  });
                }
              }
              let packet = EncodedPacket.fromEncodedChunk(chunk);
              packet = packet.clone({
                timestamp: roundToDivisor(packet.timestamp, encoderConfig.sampleRate),
                duration: chunk.duration != null ? roundToDivisor(packet.duration, encoderConfig.sampleRate) : void 0
              });
              this.encodingConfig.onEncodedPacket?.(packet, meta);
              this.lastMuxerPromise = this.muxer.addEncodedAudioPacket(this.source._connectedTrack, packet, meta).catch((error) => {
                this.setError(error);
              });
            },
            error: (error) => {
              error.stack = stack;
              this.setError(error);
            }
          });
          this.encoder.configure(encoderConfig);
        }
        assert(this.source._connectedTrack);
        this.muxer = this.source._connectedTrack.output._muxer;
        this.encoderInitialized = true;
      })();
    }
    initPcmEncoder() {
      this.isPcmEncoder = true;
      const codec = this.encodingConfig.codec;
      const { dataType, sampleSize, littleEndian } = parsePcmCodec(codec);
      this.outputSampleSize = sampleSize;
      switch (sampleSize) {
        case 1:
          {
            if (dataType === "unsigned") {
              this.writeOutputValue = (view2, byteOffset, value) => view2.setUint8(byteOffset, clamp((value + 1) * 127.5, 0, 255));
            } else if (dataType === "signed") {
              this.writeOutputValue = (view2, byteOffset, value) => {
                view2.setInt8(byteOffset, clamp(Math.round(value * 128), -128, 127));
              };
            } else if (dataType === "ulaw") {
              this.writeOutputValue = (view2, byteOffset, value) => {
                const int16 = clamp(Math.floor(value * 32767), -32768, 32767);
                view2.setUint8(byteOffset, toUlaw(int16));
              };
            } else if (dataType === "alaw") {
              this.writeOutputValue = (view2, byteOffset, value) => {
                const int16 = clamp(Math.floor(value * 32767), -32768, 32767);
                view2.setUint8(byteOffset, toAlaw(int16));
              };
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 2:
          {
            if (dataType === "unsigned") {
              this.writeOutputValue = (view2, byteOffset, value) => view2.setUint16(byteOffset, clamp((value + 1) * 32767.5, 0, 65535), littleEndian);
            } else if (dataType === "signed") {
              this.writeOutputValue = (view2, byteOffset, value) => view2.setInt16(byteOffset, clamp(Math.round(value * 32767), -32768, 32767), littleEndian);
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 3:
          {
            if (dataType === "unsigned") {
              this.writeOutputValue = (view2, byteOffset, value) => setUint24(view2, byteOffset, clamp((value + 1) * 83886075e-1, 0, 16777215), littleEndian);
            } else if (dataType === "signed") {
              this.writeOutputValue = (view2, byteOffset, value) => setInt24(
                view2,
                byteOffset,
                clamp(Math.round(value * 8388607), -8388608, 8388607),
                littleEndian
              );
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 4:
          {
            if (dataType === "unsigned") {
              this.writeOutputValue = (view2, byteOffset, value) => view2.setUint32(byteOffset, clamp((value + 1) * 21474836475e-1, 0, 4294967295), littleEndian);
            } else if (dataType === "signed") {
              this.writeOutputValue = (view2, byteOffset, value) => view2.setInt32(
                byteOffset,
                clamp(Math.round(value * 2147483647), -2147483648, 2147483647),
                littleEndian
              );
            } else if (dataType === "float") {
              this.writeOutputValue = (view2, byteOffset, value) => view2.setFloat32(byteOffset, value, littleEndian);
            } else {
              assert(false);
            }
          }
          ;
          break;
        case 8:
          {
            if (dataType === "float") {
              this.writeOutputValue = (view2, byteOffset, value) => view2.setFloat64(byteOffset, value, littleEndian);
            } else {
              assert(false);
            }
          }
          ;
          break;
        default:
          {
            assertNever(sampleSize);
            assert(false);
          }
          ;
      }
    }
    async flushAndClose(forceClose) {
      try {
        if (!forceClose) {
          this.checkForEncoderError();
          if (this.resampler) {
            await this.resampler.finalize();
          }
        }
        this.closed = true;
        if (!forceClose) {
          if (this.customEncoder) {
            void this.customEncoderCallSerializer.call(() => this.customEncoder.flush());
          } else if (this.encoder) {
            await this.encoder.flush();
          }
        }
      } finally {
        this.closed = true;
        this.resampler = null;
        if (this.customEncoder) {
          await this.customEncoderCallSerializer.call(() => this.customEncoder.close()).catch((error) => this.setError(error));
        } else if (this.encoder && this.encoder.state !== "closed") {
          this.encoder.close();
        }
      }
      if (!forceClose) {
        this.checkForEncoderError();
      }
    }
    getQueueSize() {
      if (this.customEncoder) {
        return this.customEncoderQueueSize;
      } else if (this.isPcmEncoder) {
        return 0;
      } else {
        return this.encoder?.encodeQueueSize ?? 0;
      }
    }
    checkForEncoderError() {
      if (this.errorSet) {
        throw this.error;
      }
    }
  };
  var AudioSampleSource = class extends AudioSource {
    /**
     * Creates a new {@link AudioSampleSource} whose samples are encoded according to the specified
     * {@link AudioEncodingConfig}.
     */
    constructor(encodingConfig) {
      validateAudioEncodingConfig(encodingConfig);
      super(encodingConfig.codec);
      this._encoder = new AudioEncoderWrapper(this, encodingConfig);
    }
    /**
     * Encodes an audio sample and then adds it to the output.
     *
     * @returns A Promise that resolves once the output is ready to receive more samples. You should await this Promise
     * to respect writer and encoder backpressure.
     */
    add(audioSample) {
      if (!(audioSample instanceof AudioSample)) {
        throw new TypeError("audioSample must be an AudioSample.");
      }
      return this._encoder.add(audioSample, false);
    }
    /** @internal */
    _flushAndClose(forceClose) {
      return this._encoder.flushAndClose(forceClose);
    }
  };
  var AudioBufferSource = class extends AudioSource {
    /**
     * Creates a new {@link AudioBufferSource} whose `AudioBuffer` instances are encoded according to the specified
     * {@link AudioEncodingConfig}.
     */
    constructor(encodingConfig) {
      validateAudioEncodingConfig(encodingConfig);
      super(encodingConfig.codec);
      /** @internal */
      this._accumulatedTime = 0;
      this._encoder = new AudioEncoderWrapper(this, encodingConfig);
    }
    /**
     * Converts an AudioBuffer to audio samples, encodes them and adds them to the output. The first AudioBuffer will
     * be played at timestamp 0, and any subsequent AudioBuffer will have a timestamp equal to the total duration of
     * all previous AudioBuffers.
     *
     * @returns A Promise that resolves once the output is ready to receive more samples. You should await this Promise
     * to respect writer and encoder backpressure.
     */
    async add(audioBuffer) {
      if (!(audioBuffer instanceof AudioBuffer)) {
        throw new TypeError("audioBuffer must be an AudioBuffer.");
      }
      const iterator = AudioSample._fromAudioBuffer(audioBuffer, this._accumulatedTime);
      this._accumulatedTime += audioBuffer.duration;
      for (const audioSample of iterator) {
        await this._encoder.add(audioSample, true);
      }
    }
    /** @internal */
    _flushAndClose(forceClose) {
      return this._encoder.flushAndClose(forceClose);
    }
  };
  var MediaStreamAudioTrackSource = class extends AudioSource {
    /**
     * Creates a new {@link MediaStreamAudioTrackSource} from a `MediaStreamAudioTrack`, which will pull audio samples
     * from the stream in real time and encode them according to {@link AudioEncodingConfig}.
     */
    constructor(track, encodingConfig, options = {}) {
      if (!(track instanceof MediaStreamTrack) || track.kind !== "audio") {
        throw new TypeError("track must be an audio MediaStreamTrack.");
      }
      validateAudioEncodingConfig(encodingConfig);
      if (typeof options !== "object" || !options) {
        throw new TypeError("options must be an object.");
      }
      if (options.timestampBase !== void 0 && options.timestampBase !== "synced-zero" && options.timestampBase !== "zero" && options.timestampBase !== "unix") {
        throw new TypeError(
          "options.timestampBase, when provided, must be one of 'synced-zero', 'zero', or 'unix'."
        );
      }
      super(encodingConfig.codec);
      /** @internal */
      this._abortController = null;
      /** @internal */
      this._audioContext = null;
      /** @internal */
      // eslint-disable-next-line @typescript-eslint/no-deprecated
      this._scriptProcessorNode = null;
      // Deprecated but goated
      /** @internal */
      this._promiseWithResolvers = promiseWithResolvers();
      /** @internal */
      this._errorPromiseAccessed = false;
      /** @internal */
      this._paused = false;
      this._options = options;
      this._encoder = new AudioEncoderWrapper(this, encodingConfig);
      this._track = track;
    }
    /** A promise that rejects upon any error within this source. This promise never resolves. */
    get errorPromise() {
      this._errorPromiseAccessed = true;
      return this._promiseWithResolvers.promise;
    }
    /** Whether this source is currently paused as a result of calling `.pause()`. */
    get paused() {
      return this._paused;
    }
    /** @internal */
    async _start() {
      if (!this._errorPromiseAccessed) {
        Logging._warn(
          "Make sure not to ignore the `errorPromise` field on MediaStreamAudioTrackSource, so that any internal errors get bubbled up properly."
        );
      }
      this._abortController = new AbortController();
      let firstAudioDataTimestamp = null;
      let errored = false;
      let lastSampleTimestamp = null;
      let timestampOffset = 0;
      const onAudioSample = (audioSample) => {
        if (errored) {
          audioSample.close();
          return;
        }
        const currentTimestamp = audioSample.timestamp;
        if (this._paused) {
          const dataSeen = firstAudioDataTimestamp !== null;
          if (dataSeen) {
            if (lastSampleTimestamp !== null && this._options.timestampBase !== "unix") {
              const timeDelta = currentTimestamp - lastSampleTimestamp;
              timestampOffset -= timeDelta;
            }
            lastSampleTimestamp = currentTimestamp;
          }
          audioSample.close();
          return;
        }
        if (firstAudioDataTimestamp === null) {
          firstAudioDataTimestamp = audioSample.timestamp;
          let target;
          const timestampBase = this._options.timestampBase ?? "synced-zero";
          if (timestampBase === "unix") {
            target = Date.now() / 1e3;
          } else if (timestampBase === "zero") {
            target = 0;
          } else {
            const output = this._connectedTrack.output;
            if (output._firstMediaStreamTimestamp === null) {
              output._firstMediaStreamTimestamp = performance.now() / 1e3;
              target = 0;
            } else {
              target = performance.now() / 1e3 - output._firstMediaStreamTimestamp;
            }
          }
          timestampOffset = target - firstAudioDataTimestamp;
        }
        lastSampleTimestamp = currentTimestamp;
        if (this._encoder.getQueueSize() >= 8) {
          audioSample.close();
          return;
        }
        audioSample.setTimestamp(currentTimestamp + timestampOffset);
        void this._encoder.add(audioSample, true).catch((error) => {
          errored = true;
          this._abortController?.abort();
          this._promiseWithResolvers.reject(error);
          void this._audioContext?.suspend();
        });
      };
      if (typeof MediaStreamTrackProcessor !== "undefined") {
        const processor = new MediaStreamTrackProcessor({ track: this._track });
        const consumer = new WritableStream({
          write: (audioData) => onAudioSample(new AudioSample(audioData))
        });
        processor.readable.pipeTo(consumer, {
          signal: this._abortController.signal
        }).catch((error) => {
          if (error instanceof DOMException && error.name === "AbortError") return;
          this._promiseWithResolvers.reject(error);
        });
      } else {
        const AudioContext = window.AudioContext || window.webkitAudioContext;
        this._audioContext = new AudioContext({ sampleRate: this._track.getSettings().sampleRate });
        const sourceNode = this._audioContext.createMediaStreamSource(new MediaStream([this._track]));
        this._scriptProcessorNode = this._audioContext.createScriptProcessor(4096);
        if (this._audioContext.state === "suspended") {
          await this._audioContext.resume();
        }
        sourceNode.connect(this._scriptProcessorNode);
        this._scriptProcessorNode.connect(this._audioContext.destination);
        let totalDuration = 0;
        this._scriptProcessorNode.onaudioprocess = (event) => {
          const iterator = AudioSample._fromAudioBuffer(event.inputBuffer, totalDuration);
          totalDuration += event.inputBuffer.duration;
          for (const audioSample of iterator) {
            onAudioSample(audioSample);
          }
        };
      }
    }
    /**
     * Pauses the capture of audio data - any audio data emitted by the underlying media stream will be ignored
     * while paused. This does *not* close the underlying `MediaStreamAudioTrack`, it just ignores its output.
     */
    pause() {
      this._paused = true;
    }
    /** Resumes the capture of audio data after being paused. */
    resume() {
      this._paused = false;
    }
    /** @internal */
    async _flushAndClose(forceClose) {
      if (this._abortController) {
        this._abortController.abort();
        this._abortController = null;
      }
      if (this._audioContext) {
        assert(this._scriptProcessorNode);
        this._scriptProcessorNode.disconnect();
        await this._audioContext.suspend();
      }
      await this._encoder.flushAndClose(forceClose);
    }
  };
  var mediaStreamTrackProcessorWorkerCode = () => {
    const sendMessage = (message, transfer) => {
      if (transfer) {
        self.postMessage(message, { transfer });
      } else {
        self.postMessage(message);
      }
    };
    sendMessage({
      type: "support",
      supported: typeof MediaStreamTrackProcessor !== "undefined"
    });
    const abortControllers = /* @__PURE__ */ new Map();
    const activeTracks = /* @__PURE__ */ new Map();
    self.addEventListener("message", (event) => {
      const message = event.data;
      switch (message.type) {
        case "videoTrack":
          {
            activeTracks.set(message.trackId, message.track);
            const processor = new MediaStreamTrackProcessor({ track: message.track });
            const consumer = new WritableStream({
              write: (videoFrame) => {
                if (!activeTracks.has(message.trackId)) {
                  videoFrame.close();
                  return;
                }
                sendMessage({
                  type: "videoFrame",
                  trackId: message.trackId,
                  videoFrame
                }, [videoFrame]);
              }
            });
            const abortController = new AbortController();
            abortControllers.set(message.trackId, abortController);
            processor.readable.pipeTo(consumer, {
              signal: abortController.signal
            }).catch((error) => {
              if (error instanceof DOMException && error.name === "AbortError") return;
              sendMessage({
                type: "error",
                trackId: message.trackId,
                error
              });
            });
          }
          ;
          break;
        case "stopTrack":
          {
            const abortController = abortControllers.get(message.trackId);
            if (abortController) {
              abortController.abort();
              abortControllers.delete(message.trackId);
            }
            const track = activeTracks.get(message.trackId);
            track?.stop();
            activeTracks.delete(message.trackId);
            sendMessage({
              type: "trackStopped",
              trackId: message.trackId
            });
          }
          ;
          break;
        default:
          assertNever(message);
      }
    });
  };
  var nextMediaStreamTrackProcessorWorkerId = 0;
  var mediaStreamTrackProcessorWorker = null;
  var initMediaStreamTrackProcessorWorker = () => {
    const blob = new Blob(
      [`(${mediaStreamTrackProcessorWorkerCode.toString()})()`],
      { type: "application/javascript" }
    );
    const url2 = URL.createObjectURL(blob);
    mediaStreamTrackProcessorWorker = new Worker(url2);
  };
  var mediaStreamTrackProcessorIsSupportedInWorkerCache = null;
  var mediaStreamTrackProcessorIsSupportedInWorker = async () => {
    if (mediaStreamTrackProcessorIsSupportedInWorkerCache !== null) {
      return mediaStreamTrackProcessorIsSupportedInWorkerCache;
    }
    if (!mediaStreamTrackProcessorWorker) {
      initMediaStreamTrackProcessorWorker();
    }
    return new Promise((resolve) => {
      assert(mediaStreamTrackProcessorWorker);
      const listener = (event) => {
        const message = event.data;
        if (message.type === "support") {
          mediaStreamTrackProcessorIsSupportedInWorkerCache = message.supported;
          mediaStreamTrackProcessorWorker.removeEventListener("message", listener);
          resolve(message.supported);
        }
      };
      mediaStreamTrackProcessorWorker.addEventListener("message", listener);
    });
  };
  var sendMessageToMediaStreamTrackProcessorWorker = (message, transfer) => {
    assert(mediaStreamTrackProcessorWorker);
    if (transfer) {
      mediaStreamTrackProcessorWorker.postMessage(message, transfer);
    } else {
      mediaStreamTrackProcessorWorker.postMessage(message);
    }
  };
  var SubtitleSource = class extends MediaSource {
    /** Internal constructor. */
    constructor(codec) {
      super();
      /** @internal */
      this._connectedTrack = null;
      if (!SUBTITLE_CODECS.includes(codec)) {
        throw new TypeError(`Invalid subtitle codec '${codec}'. Must be one of: ${SUBTITLE_CODECS.join(", ")}.`);
      }
      this._codec = codec;
    }
  };
  var TextSubtitleSource = class extends SubtitleSource {
    /** Creates a new {@link TextSubtitleSource} where added text chunks are in the specified `codec`. */
    constructor(codec) {
      super(codec);
      /** @internal */
      this._error = null;
      /** @internal */
      this._errorSet = false;
      /** @internal */
      this._lastMuxerPromise = Promise.resolve();
      this._parser = new SubtitleParser({
        codec,
        output: (cue, metadata) => {
          this._lastMuxerPromise = this._connectedTrack.output._muxer.addSubtitleCue(this._connectedTrack, cue, metadata).catch((error) => {
            this._setError(error);
          });
        }
      });
    }
    /**
     * Parses the subtitle text according to the specified codec and adds it to the output track. You don't have to
     * add the entire subtitle file at once here; you can provide it in chunks.
     *
     * @returns A Promise that resolves once the output is ready to receive more samples. You should await this Promise
     * to respect writer and encoder backpressure.
     */
    add(text) {
      if (typeof text !== "string") {
        throw new TypeError("text must be a string.");
      }
      this._checkForError();
      this._ensureValidAdd();
      this._parser.parse(text);
      return this._lastMuxerPromise;
    }
    /** @internal */
    _setError(error) {
      if (!this._errorSet) {
        this._error = error;
        this._errorSet = true;
      }
    }
    /** @internal */
    _checkForError() {
      if (this._errorSet) {
        throw this._error;
      }
    }
    /** @internal */
    async _flushAndClose(forceClose) {
      if (!forceClose) {
        this._checkForError();
      }
    }
  };

  // src/hls/hls-muxer.ts
  var HlsMuxer = class extends Muxer {
    constructor(output, format) {
      if (!(output._target instanceof PathedTarget)) {
        throw new TypeError("HLS outputs require `OutputOptions.target` to be a PathedTarget.");
      }
      super(output);
      this.trackDatas = [];
      this.isRelativeToUnixEpoch = false;
      this.numWrittenMasterPlaylists = 0;
      this.playlists = [];
      this.playlistDeclarations = [];
      this.format = format;
      this.targetSegmentDuration = format._options.targetDuration ?? 2;
      this.singleFilePerPlaylist = format._options.singleFilePerPlaylist ?? false;
      this.isLive = format._options.live ?? false;
      this.maxLiveSegmentCount = format._options.maxLiveSegmentCount ?? Infinity;
      this.globalTargetDuration = this.targetSegmentDuration;
      this.getPlaylistPath = format._options.getPlaylistPath ?? (({ n }) => `playlist-${n}.m3u8`);
      this.getSegmentPath = format._options.getSegmentPath ?? ((info) => info.isSingleFile ? `segments-${info.playlist.n}${info.format.fileExtension}` : `segment-${info.playlist.n}-${info.n}${info.format.fileExtension}`);
      this.getInitPath = format._options.getInitPath ?? ((playlist) => `init-${playlist.n}${playlist.segmentFormat.fileExtension}`);
    }
    async start() {
      const release = await this.mutex.acquire();
      const someRelative = this.output.tracks.some((t) => t.metadata.isRelativeToUnixEpoch);
      const someNotRelative = this.output.tracks.some((t) => !t.metadata.isRelativeToUnixEpoch);
      if (someRelative && someNotRelative) {
        throw new Error(
          "All tracks must agree on `relativeToUnixEpoch`: some tracks are relative to the Unix epoch and some are not."
        );
      }
      this.isRelativeToUnixEpoch = someRelative;
      const groupAssignment = /* @__PURE__ */ new Map();
      const groups = [];
      let hasVideo = false;
      let illegalPairingDetected = false;
      let keyPacketsOnlyPairingWarned = false;
      for (const track of this.output.tracks) {
        if (track.type === "video") {
          hasVideo = true;
        }
        const pairableGroups = /* @__PURE__ */ new Map();
        for (const otherTrack of this.output.tracks) {
          if (track === otherTrack) {
            continue;
          }
          if (!track.canBePairedWith(otherTrack)) {
            continue;
          }
          if (track.type === otherTrack.type) {
            if (!illegalPairingDetected) {
              Logging._warn(
                `Illegal pairing of two ${track.type} tracks detected, which is not possible in HLS; treating them as unpaired.`
              );
              illegalPairingDetected = true;
            }
            continue;
          }
          if (track.isVideoTrack() && track.metadata.hasOnlyKeyPackets || otherTrack.isVideoTrack() && otherTrack.metadata.hasOnlyKeyPackets) {
            if (!keyPacketsOnlyPairingWarned) {
              Logging._warn(
                `A key-packets-only video track is pairable with another track, which is not possible in HLS; treating them as unpaired.`
              );
              keyPacketsOnlyPairingWarned = true;
            }
            continue;
          }
          let groupTracks = pairableGroups.get(otherTrack.source._codec);
          if (!groupTracks) {
            pairableGroups.set(otherTrack.source._codec, groupTracks = []);
          }
          groupTracks.push(otherTrack);
        }
        for (const [, pairableTracks] of pairableGroups) {
          const key = pairableTracks.map((x) => x.id).join("-");
          const group = groups.find((x) => x.key === key);
          if (!group) {
            groups.push({
              name: pairableTracks[0].type + "-" + (groups.length + 1),
              key,
              tracks: pairableTracks,
              needsEmit: false,
              firstNoUri: false
            });
          }
          let assignedGroups = groupAssignment.get(track);
          if (!assignedGroups) {
            groupAssignment.set(track, assignedGroups = []);
          }
          assignedGroups.push(key);
        }
      }
      const mainType = hasVideo ? "video" : "audio";
      const variantStreams = [];
      const unpairedVideoTracks = [];
      const unpairedAudioTracks = [];
      for (const track of this.output.tracks) {
        const assignedGroupKeys = groupAssignment.get(track);
        if (assignedGroupKeys) {
          assert(assignedGroupKeys.length > 0);
          if (track.type !== mainType) {
            continue;
          }
          for (const key of assignedGroupKeys) {
            const group = groups.find((x) => x.key === key);
            assert(group);
            if (assignedGroupKeys.length === 1 && group.tracks.length === 1) {
              const otherGroupKeys = groupAssignment.get(group.tracks[0]);
              assert(otherGroupKeys !== void 0);
              if (otherGroupKeys.length === 1) {
                const otherGroup = groups.find((x) => x.key === otherGroupKeys[0]);
                if (otherGroup.tracks.length === 1) {
                  assert(otherGroup.tracks[0] === track);
                  variantStreams.push({
                    tracks: [track, group.tracks[0]],
                    linkedGroup: null
                  });
                  continue;
                }
              }
            }
            variantStreams.push({
              tracks: [track],
              linkedGroup: group
            });
            group.needsEmit = true;
          }
        } else {
          if (track.type === "video") {
            unpairedVideoTracks.push(track);
          } else if (track.type === "audio") {
            unpairedAudioTracks.push(track);
          }
        }
      }
      const getMetadataKeyForTrack = ({ metadata }) => {
        let key = "";
        key += `${metadata.languageCode ?? UNDETERMINED_LANGUAGE}-`;
        key += `${metadata.name ?? ""}-`;
        key += `${metadata.disposition?.default ?? true}-`;
        key += `${metadata.disposition?.primary ?? false}-`;
        key += `${metadata.disposition?.forced ?? false}-`;
        return key;
      };
      if (unpairedVideoTracks.length > 0) {
        const uniqueMetadata = new Set(unpairedVideoTracks.map(getMetadataKeyForTrack));
        if (uniqueMetadata.size > 1) {
          const group = {
            key: unpairedVideoTracks.map((x) => x.id).join("-"),
            name: "video-" + (groups.length + 1),
            tracks: unpairedVideoTracks,
            needsEmit: true,
            firstNoUri: true
          };
          groups.push(group);
          variantStreams.push({
            tracks: [unpairedVideoTracks[0]],
            linkedGroup: group
          });
        } else {
          for (const track of unpairedVideoTracks) {
            variantStreams.push({
              tracks: [track],
              linkedGroup: null
            });
          }
        }
      }
      if (unpairedAudioTracks.length > 0) {
        const uniqueMetadata = new Set(unpairedAudioTracks.map(getMetadataKeyForTrack));
        if (uniqueMetadata.size > 1) {
          const group = {
            key: unpairedAudioTracks.map((x) => x.id).join("-"),
            name: "audio-" + (groups.length + 1),
            tracks: unpairedAudioTracks,
            needsEmit: true,
            firstNoUri: true
          };
          groups.push(group);
          variantStreams.push({
            tracks: [unpairedAudioTracks[0]],
            linkedGroup: group
          });
        } else {
          for (const track of unpairedAudioTracks) {
            variantStreams.push({
              tracks: [track],
              linkedGroup: null
            });
          }
        }
      }
      const deduceSegmentFormat = (tracks) => {
        const codecs = [];
        let videoCount = 0;
        let audioCount = 0;
        let requiresRotationMetadata = false;
        let candidate = null;
        let candidateScore = -Infinity;
        for (const track of tracks) {
          if (track.isVideoTrack()) {
            videoCount++;
            requiresRotationMetadata ||= (track.metadata.rotation ?? 0) !== 0;
          } else if (track.isAudioTrack()) {
            audioCount++;
          }
          codecs.push(track.source._codec);
        }
        for (const format of toArray(this.format._options.segmentFormat)) {
          const supportedCodecs = format.getSupportedCodecs();
          const trackCounts = format.getSupportedTrackCounts();
          if (codecs.some((codec) => !supportedCodecs.includes(codec))) {
            continue;
          }
          if (videoCount < trackCounts.video.min || videoCount > trackCounts.video.max) {
            continue;
          }
          if (audioCount < trackCounts.audio.min || audioCount > trackCounts.audio.max) {
            continue;
          }
          let score = 0;
          if (requiresRotationMetadata && format.supportsVideoRotationMetadata) {
            score++;
          }
          if (score > candidateScore) {
            candidate = format;
            candidateScore = score;
          }
        }
        assert(candidate);
        return candidate;
      };
      const registerPlaylist = async (tracks) => {
        if (tracks.some((track) => this.playlists.some((playlist2) => playlist2.tracks.includes(track)))) {
          throw new Error("Internal error: track is already registered in a playlist.");
        }
        const format = deduceSegmentFormat(tracks);
        const id = this.playlists.length + 1;
        const path = await this.getPlaylistPath({
          n: id,
          tracks,
          segmentFormat: format
        });
        validatePlaylistPath(path);
        const playlist = {
          id: this.playlists.length + 1,
          path,
          tracks,
          segmentFormat: format,
          currentSegmentStartTimestamp: null,
          currentSegmentStartTimestampIsFixed: false,
          nextSegmentId: 1,
          initSegment: null,
          writtenSegments: [],
          peakBitrate: null,
          averageBitrate: null,
          mediaSequence: 0,
          done: false,
          singleFile: null,
          mutex: new AsyncMutex()
        };
        this.playlists.push(playlist);
        return playlist;
      };
      for (const group of groups) {
        if (!group.needsEmit) {
          continue;
        }
        for (let i = 0; i < group.tracks.length; i++) {
          const track = group.tracks[i];
          let playlist = this.playlists.find((x) => x.tracks[0].id === track.id);
          playlist ??= await registerPlaylist([track]);
          this.playlistDeclarations.push({
            playlist,
            groupId: group.name,
            noUri: group.firstNoUri && i === 0,
            references: []
          });
        }
      }
      for (const variant of variantStreams) {
        let playlist = this.playlists.find((x) => x.tracks[0].id === variant.tracks[0].id);
        playlist ??= await registerPlaylist(variant.tracks);
        this.playlistDeclarations.push({
          playlist,
          groupId: null,
          noUri: false,
          references: variant.linkedGroup ? this.playlistDeclarations.filter((x) => x.groupId === variant.linkedGroup.name) : []
        });
      }
      for (const track of this.output.tracks) {
        if (track.isVideoTrack() && track.metadata.decoderConfig) {
          this.getVideoTrackData(
            track,
            track.metadata.primingPacket ?? null,
            { decoderConfig: track.metadata.decoderConfig }
          );
        } else if (track.isAudioTrack() && track.metadata.decoderConfig) {
          this.getAudioTrackData(
            track,
            track.metadata.primingPacket ?? null,
            { decoderConfig: track.metadata.decoderConfig }
          );
        }
      }
      release();
    }
    async getMimeType() {
      return HLS_MIME_TYPE;
    }
    allTracksAreKnown(playlist) {
      for (const track of playlist.tracks) {
        if (!track.source._closed && !this.trackDatas.some((x) => x.track === track)) {
          return false;
        }
      }
      return true;
    }
    // eslint-disable-next-line @typescript-eslint/no-misused-promises
    async onTrackClose(track) {
      const trackData = this.trackDatas.find((x) => x.track === track);
      if (trackData) {
        trackData.closed = true;
      }
      const playlist = this.playlists.find((x) => x.tracks.includes(track));
      assert(playlist);
      const release = await playlist.mutex.acquire();
      try {
        await this.advancePlaylist(playlist);
      } finally {
        release();
      }
    }
    getVideoTrackData(track, packet, meta) {
      let trackData = this.trackDatas.find((x) => x.track === track);
      if (trackData) {
        return trackData;
      }
      validateVideoChunkMetadata(meta, track.source._codec);
      assert(meta);
      assert(meta?.decoderConfig);
      const playlists = this.playlists.filter((x) => x.tracks.includes(track));
      assert(playlists.length === 1);
      trackData = {
        track,
        packets: [],
        playlist: playlists[0],
        closed: false,
        info: {
          type: "video",
          decoderConfig: meta.decoderConfig,
          primingPacket: packet
        }
      };
      this.trackDatas.push(trackData);
      return trackData;
    }
    getAudioTrackData(track, packet, meta) {
      let trackData = this.trackDatas.find((x) => x.track === track);
      if (trackData) {
        return trackData;
      }
      validateAudioChunkMetadata(meta, track.source._codec);
      assert(meta);
      assert(meta?.decoderConfig);
      const playlists = this.playlists.filter((x) => x.tracks.includes(track));
      assert(playlists.length === 1);
      trackData = {
        track,
        packets: [],
        playlist: playlists[0],
        closed: false,
        info: {
          type: "audio",
          decoderConfig: meta.decoderConfig,
          primingPacket: packet
        }
      };
      this.trackDatas.push(trackData);
      return trackData;
    }
    async addEncodedVideoPacket(track, packet, meta) {
      const trackData = this.getVideoTrackData(track, packet, meta);
      const playlist = trackData.playlist;
      const release = await playlist.mutex.acquire();
      try {
        this.validateTimestamp(track, packet.timestamp, packet.type === "key");
        trackData.packets.push(packet);
        if (playlist.currentSegmentStartTimestamp === null) {
          playlist.currentSegmentStartTimestamp = packet.timestamp;
        } else if (!playlist.currentSegmentStartTimestampIsFixed) {
          playlist.currentSegmentStartTimestamp = Math.min(
            playlist.currentSegmentStartTimestamp,
            packet.timestamp
          );
        }
        await this.advancePlaylist(playlist);
      } finally {
        release();
      }
    }
    async addEncodedAudioPacket(track, packet, meta) {
      const trackData = this.getAudioTrackData(track, packet, meta);
      const playlist = trackData.playlist;
      const release = await playlist.mutex.acquire();
      try {
        this.validateTimestamp(track, packet.timestamp, packet.type === "key");
        trackData.packets.push(packet);
        if (playlist.currentSegmentStartTimestamp === null) {
          playlist.currentSegmentStartTimestamp = packet.timestamp;
        } else if (!playlist.currentSegmentStartTimestampIsFixed) {
          playlist.currentSegmentStartTimestamp = Math.min(
            playlist.currentSegmentStartTimestamp,
            packet.timestamp
          );
        }
        await this.advancePlaylist(playlist);
      } finally {
        release();
      }
    }
    async addSubtitleCue(track, cue, meta) {
      throw new Error("Unreachable.");
    }
    async advancePlaylist(playlist) {
      assert(!playlist.done);
      if (!this.allTracksAreKnown(playlist)) {
        return;
      }
      const trackDatas = this.trackDatas.filter((x) => playlist.tracks.includes(x.track));
      if (playlist.currentSegmentStartTimestamp === null) {
        if (trackDatas.every((x) => x.closed)) {
          await this.onPlaylistDone(playlist);
        }
        return;
      }
      const videoTrack = trackDatas.find((x) => x.info.type === "video");
      const audioTrack = trackDatas.find((x) => x.info.type === "audio");
      while (true) {
        const currentSegmentEndTimestamp = playlist.currentSegmentStartTimestamp + this.targetSegmentDuration;
        let videoEndIndex = 0;
        let audioEndIndex = 0;
        if (videoTrack && (!videoTrack.closed || videoTrack.packets.length > 0)) {
          const allBelow = videoTrack.packets.every((x) => x.timestamp < currentSegmentEndTimestamp);
          let bestKeyPacket = null;
          let bestKeyPacketIndex = null;
          if (allBelow) {
            if (!videoTrack.closed) {
              return;
            }
          } else {
            for (let i = 0; i < videoTrack.packets.length; i++) {
              const packet = videoTrack.packets[i];
              if (bestKeyPacket !== null && packet.timestamp > currentSegmentEndTimestamp) {
                break;
              }
              if (i > 0 && packet.type === "key") {
                bestKeyPacket = packet;
                bestKeyPacketIndex = i;
              }
            }
          }
          if (bestKeyPacketIndex !== null) {
            videoEndIndex = bestKeyPacketIndex;
            if (audioTrack) {
              const index = audioTrack.packets.findIndex((x) => x.timestamp >= bestKeyPacket.timestamp);
              if (index !== -1) {
                audioEndIndex = index;
              } else {
                if (audioTrack.closed) {
                  audioEndIndex = audioTrack.packets.length;
                } else {
                  return;
                }
              }
            }
          } else {
            if (!videoTrack.closed) {
              return;
            }
            videoEndIndex = videoTrack.packets.length;
            const maxIndex = arrayArgmax(videoTrack.packets, (x) => x.timestamp);
            const maxPacket = videoTrack.packets[maxIndex];
            assert(maxPacket);
            if (audioTrack) {
              if (maxPacket.timestamp < currentSegmentEndTimestamp) {
                const index = audioTrack.packets.findIndex((x) => x.timestamp >= currentSegmentEndTimestamp);
                if (index !== -1) {
                  audioEndIndex = index;
                } else {
                  if (audioTrack.closed) {
                    audioEndIndex = audioTrack.packets.length;
                  } else {
                    return;
                  }
                }
              } else {
                const index = audioTrack.packets.findIndex((x) => x.timestamp > maxPacket.timestamp);
                if (index !== -1) {
                  audioEndIndex = index;
                } else {
                  if (audioTrack.closed) {
                    audioEndIndex = audioTrack.packets.length;
                  } else {
                    return;
                  }
                }
              }
            }
          }
        } else if (audioTrack && (!audioTrack.closed || audioTrack.packets.length > 0)) {
          const allBelow = audioTrack.packets.every((x) => x.timestamp < currentSegmentEndTimestamp);
          if (allBelow) {
            if (audioTrack.closed) {
              audioEndIndex = audioTrack.packets.length;
            } else {
              return;
            }
          } else {
            const index = findLastIndex(audioTrack.packets, (x) => x.timestamp <= currentSegmentEndTimestamp);
            audioEndIndex = Math.max(index, 1);
          }
        }
        if (videoEndIndex === 0 && audioEndIndex === 0) {
          const allClosed = trackDatas.every((x) => x.closed);
          if (allClosed) {
            await this.onPlaylistDone(playlist);
          }
          return;
        }
        let segmentInfo = null;
        let relativeSegmentPath;
        let fullSegmentPath;
        assert(this.output._target instanceof PathedTarget);
        const pathedTarget = this.output._target;
        if (this.singleFilePerPlaylist) {
          if (playlist.singleFile === null) {
            const segmentInfo2 = {
              n: playlist.nextSegmentId,
              format: playlist.segmentFormat,
              isSingleFile: true,
              playlist: toPlaylistInfo(playlist)
            };
            relativeSegmentPath = await this.getSegmentPath(segmentInfo2);
            validateSegmentPath(relativeSegmentPath);
            fullSegmentPath = joinPaths(
              joinPaths(pathedTarget.rootPath, playlist.path),
              relativeSegmentPath
            );
            const target = await this.output._getTarget({
              path: fullSegmentPath,
              isRoot: false,
              mimeType: playlist.segmentFormat.mimeType
            });
            let fragmentedIsobmffOutput = null;
            if (playlist.segmentFormat._isFragmentedIsobmff()) {
              fragmentedIsobmffOutput = {
                output: new Output({
                  format: playlist.segmentFormat,
                  target
                }),
                videoSource: null,
                audioSource: null,
                firstMoofPosition: null,
                currentFileSize: 0
              };
              target.on("write", ({ end }) => {
                fragmentedIsobmffOutput.currentFileSize = Math.max(
                  fragmentedIsobmffOutput.currentFileSize,
                  end
                );
              });
              const muxer = fragmentedIsobmffOutput.output._muxer;
              muxer.minimumFragmentDuration = Infinity;
              const originalOnMoof = muxer.formatOptions.onMoof;
              muxer.formatOptions.onMoof = (data, position, timestamp) => {
                fragmentedIsobmffOutput.firstMoofPosition = position;
                originalOnMoof?.(data, position, timestamp);
                muxer.formatOptions.onMoof = originalOnMoof;
              };
              if (videoTrack) {
                fragmentedIsobmffOutput.videoSource = new EncodedVideoPacketSource(
                  videoTrack.track.source._codec
                );
                fragmentedIsobmffOutput.output.addVideoTrack(
                  fragmentedIsobmffOutput.videoSource,
                  {
                    ...videoTrack.track.metadata,
                    decoderConfig: videoTrack.info.decoderConfig,
                    primingPacket: videoTrack.info.primingPacket ?? void 0
                  }
                );
              }
              if (audioTrack) {
                fragmentedIsobmffOutput.audioSource = new EncodedAudioPacketSource(
                  audioTrack.track.source._codec
                );
                fragmentedIsobmffOutput.output.addAudioTrack(
                  fragmentedIsobmffOutput.audioSource,
                  {
                    ...audioTrack.track.metadata,
                    decoderConfig: audioTrack.info.decoderConfig,
                    primingPacket: audioTrack.info.primingPacket ?? void 0
                  }
                );
              }
              await fragmentedIsobmffOutput.output.start();
            } else {
              target._start();
            }
            playlist.singleFile = {
              target,
              path: relativeSegmentPath,
              nextOffset: 0,
              info: segmentInfo2,
              fragmentedIsobmffOutput
            };
          } else {
            relativeSegmentPath = playlist.singleFile.path;
            fullSegmentPath = joinPaths(
              joinPaths(pathedTarget.rootPath, playlist.path),
              relativeSegmentPath
            );
          }
        } else {
          segmentInfo = {
            n: playlist.nextSegmentId,
            format: playlist.segmentFormat,
            isSingleFile: false,
            playlist: toPlaylistInfo(playlist)
          };
          relativeSegmentPath = await this.getSegmentPath(segmentInfo);
          validateSegmentPath(relativeSegmentPath);
          fullSegmentPath = joinPaths(joinPaths(pathedTarget.rootPath, playlist.path), relativeSegmentPath);
          playlist.nextSegmentId++;
        }
        let segmentSize = 0;
        let outputTarget = null;
        let maxEndTimestamp = -Infinity;
        let output = null;
        let videoSource = null;
        let audioSource = null;
        try {
          if (playlist.singleFile?.fragmentedIsobmffOutput) {
            output = playlist.singleFile.fragmentedIsobmffOutput.output;
            videoSource = playlist.singleFile.fragmentedIsobmffOutput.videoSource;
            audioSource = playlist.singleFile.fragmentedIsobmffOutput.audioSource;
          } else {
            output = new Output({
              format: playlist.segmentFormat,
              target: new PathedTarget(
                fullSegmentPath,
                async (request) => {
                  const proxiedRequest = {
                    ...request,
                    isRoot: false
                  };
                  if (request.isRoot) {
                    if (playlist.singleFile) {
                      const slice = playlist.singleFile.target.slice(playlist.singleFile.nextOffset);
                      slice.on("write", ({ end }) => segmentSize = Math.max(segmentSize, end));
                      return slice;
                    } else {
                      const target = await this.output._getTarget(proxiedRequest);
                      outputTarget = target;
                      target.on("write", ({ end }) => segmentSize = Math.max(segmentSize, end));
                      return target;
                    }
                  }
                  return this.output._getTarget(proxiedRequest);
                }
              ),
              initTarget: async () => {
                if (playlist.initSegment) {
                  return new NullTarget();
                }
                if (playlist.singleFile) {
                  playlist.initSegment = {
                    path: playlist.singleFile.path,
                    duration: 0,
                    timestamp: 0,
                    byteSize: 0,
                    byteOffset: 0,
                    info: null
                  };
                  const slice = playlist.singleFile.target.slice(playlist.singleFile.nextOffset);
                  slice.on("write", ({ end }) => {
                    playlist.initSegment.byteSize = Math.max(playlist.initSegment.byteSize, end);
                  });
                  slice.on("finalized", () => {
                    playlist.singleFile.nextOffset = playlist.initSegment.byteSize;
                  });
                  return slice;
                } else {
                  const playlistInfo = toPlaylistInfo(playlist);
                  const initPath = await this.getInitPath(playlistInfo);
                  validateInitPath(initPath);
                  playlist.initSegment = {
                    path: initPath,
                    duration: 0,
                    timestamp: 0,
                    byteSize: 0,
                    byteOffset: null,
                    info: null
                  };
                  const fullInitPath = joinPaths(
                    joinPaths(pathedTarget.rootPath, playlist.path),
                    initPath
                  );
                  const target = await this.output._getTarget({
                    path: fullInitPath,
                    isRoot: false,
                    mimeType: playlist.segmentFormat.mimeType
                  });
                  target.on("write", ({ end }) => {
                    playlist.initSegment.byteSize = Math.max(playlist.initSegment.byteSize, end);
                  });
                  target.on("finalized", () => {
                    this.format._options.onInit?.(target, playlistInfo);
                  });
                  return target;
                }
              }
            });
            if (videoTrack) {
              videoSource = new EncodedVideoPacketSource(
                videoTrack.track.source._codec
              );
              output.addVideoTrack(videoSource, {
                ...videoTrack.track.metadata,
                decoderConfig: videoTrack.info.decoderConfig,
                primingPacket: videoTrack.info.primingPacket ?? void 0
              });
            }
            if (audioTrack) {
              audioSource = new EncodedAudioPacketSource(
                audioTrack.track.source._codec
              );
              output.addAudioTrack(audioSource, {
                ...audioTrack.track.metadata,
                decoderConfig: audioTrack.info.decoderConfig,
                primingPacket: audioTrack.info.primingPacket ?? void 0
              });
            }
            await output.start();
          }
          if (videoTrack) {
            assert(videoSource);
            const meta = { decoderConfig: videoTrack.info.decoderConfig };
            for (let i = 0; i < videoEndIndex; i++) {
              const packet = videoTrack.packets[i];
              await videoSource.add(packet, meta);
              maxEndTimestamp = Math.max(maxEndTimestamp, packet.timestamp + packet.duration);
            }
          }
          if (audioTrack) {
            assert(audioSource);
            const meta = { decoderConfig: audioTrack.info.decoderConfig };
            for (let i = 0; i < audioEndIndex; i++) {
              const packet = audioTrack.packets[i];
              await audioSource.add(packet, meta);
              maxEndTimestamp = Math.max(maxEndTimestamp, packet.timestamp + packet.duration);
            }
          }
          if (playlist.singleFile?.fragmentedIsobmffOutput) {
            const muxer = playlist.singleFile.fragmentedIsobmffOutput.output._muxer;
            await muxer.forceFragmentFinalization();
            if (playlist.singleFile.fragmentedIsobmffOutput.firstMoofPosition !== null && !playlist.initSegment) {
              playlist.initSegment = {
                path: playlist.singleFile.path,
                duration: 0,
                timestamp: 0,
                byteSize: playlist.singleFile.fragmentedIsobmffOutput.firstMoofPosition,
                byteOffset: 0,
                info: null
              };
              playlist.singleFile.nextOffset = playlist.singleFile.fragmentedIsobmffOutput.firstMoofPosition;
            }
            segmentSize = playlist.singleFile.fragmentedIsobmffOutput.currentFileSize - playlist.singleFile.nextOffset;
          } else {
            await output.finalize();
          }
        } catch (e) {
          await output?.cancel();
          throw e;
        }
        if (segmentInfo) {
          assert(outputTarget);
          this.format._options.onSegment?.(outputTarget, segmentInfo);
        }
        if (videoEndIndex > 0) {
          assert(videoTrack);
          videoTrack.packets.splice(0, videoEndIndex);
        }
        if (audioEndIndex > 0) {
          assert(audioTrack);
          audioTrack.packets.splice(0, audioEndIndex);
        }
        let minNextTimestamp = Infinity;
        if (videoTrack && videoTrack.packets.length > 0) {
          minNextTimestamp = videoTrack.packets[0].timestamp;
        }
        if (audioTrack && audioTrack.packets.length > 0) {
          minNextTimestamp = Math.min(minNextTimestamp, audioTrack.packets[0].timestamp);
        }
        const nextSegmentStartTimestamp = minNextTimestamp < Infinity ? minNextTimestamp : maxEndTimestamp;
        assert(Number.isFinite(nextSegmentStartTimestamp));
        const segmentDuration = nextSegmentStartTimestamp - playlist.currentSegmentStartTimestamp;
        assert(segmentDuration >= 0);
        playlist.writtenSegments.push({
          path: relativeSegmentPath,
          duration: segmentDuration,
          timestamp: playlist.currentSegmentStartTimestamp,
          byteSize: segmentSize,
          byteOffset: playlist.singleFile ? playlist.singleFile.nextOffset : null,
          info: segmentInfo ?? null
        });
        this.globalTargetDuration = Math.max(this.globalTargetDuration, segmentDuration);
        playlist.currentSegmentStartTimestamp = nextSegmentStartTimestamp;
        playlist.currentSegmentStartTimestampIsFixed = true;
        if (playlist.singleFile) {
          playlist.singleFile.nextOffset += segmentSize;
        }
        if (this.isLive) {
          while (playlist.writtenSegments.length > this.maxLiveSegmentCount) {
            const popped = playlist.writtenSegments.shift();
            playlist.mediaSequence++;
            if (!this.singleFilePerPlaylist) {
              assert(popped.info);
              this.format._options.onSegmentPopped?.(popped.path, popped.info);
            }
          }
          await this.writePlaylist(playlist);
          await this.tryWriteMasterPlaylist();
        }
      }
    }
    async onPlaylistDone(playlist) {
      assert(!playlist.done);
      playlist.done = true;
      if (playlist.singleFile) {
        if (playlist.singleFile.fragmentedIsobmffOutput) {
          await playlist.singleFile.fragmentedIsobmffOutput.output.finalize();
        } else {
          await playlist.singleFile.target._flush();
          await playlist.singleFile.target._finalize();
        }
        this.format._options.onSegment?.(playlist.singleFile.target, playlist.singleFile.info);
      }
      await this.writePlaylist(playlist);
      if (this.isLive && playlist.writtenSegments.length === 0) {
        await this.tryWriteMasterPlaylist();
      }
    }
    updatePlaylistBitrates(playlist) {
      const segments = playlist.writtenSegments;
      let peakBitrate = 0;
      let totalBits = 0;
      let totalDuration = 0;
      for (let i = 0; i < segments.length; i++) {
        totalDuration += segments[i].duration;
        let windowBytes = 0;
        let windowDuration = 0;
        for (let j = i; j < segments.length; j++) {
          windowBytes += segments[j].byteSize;
          windowDuration += segments[j].duration;
          if (windowDuration >= 0.5 * this.globalTargetDuration && windowDuration <= 1.5 * this.globalTargetDuration) {
            peakBitrate = Math.max(peakBitrate, 8 * windowBytes / windowDuration);
          }
          if (windowDuration > 1.5 * this.globalTargetDuration) {
            break;
          }
        }
      }
      if (peakBitrate === 0) {
        for (const segment of segments) {
          const segmentDuration = segment.duration || 1;
          peakBitrate = Math.max(peakBitrate, 8 * segment.byteSize / segmentDuration);
        }
      }
      for (const segment of segments) {
        totalBits += 8 * segment.byteSize;
      }
      playlist.peakBitrate = peakBitrate;
      playlist.averageBitrate = totalBits / (totalDuration || 1);
    }
    async writePlaylist(playlist) {
      assert(this.output._target instanceof PathedTarget);
      const pathedTarget = this.output._target;
      this.updatePlaylistBitrates(playlist);
      let hasByteOffsets = false;
      for (const segment of playlist.writtenSegments) {
        hasByteOffsets ||= segment.byteOffset !== null;
      }
      const isKeyPacketsOnly = playlist.tracks[0].isVideoTrack() && playlist.tracks[0].metadata.hasOnlyKeyPackets;
      let version = 3;
      if (isKeyPacketsOnly || hasByteOffsets) {
        version = 4;
      }
      if (playlist.initSegment) {
        version = 5;
      }
      if (playlist.initSegment && !isKeyPacketsOnly) {
        version = 6;
      }
      const targetDuration = this.isLive ? this.targetSegmentDuration : this.globalTargetDuration;
      const playlistPath = joinPaths(pathedTarget.rootPath, playlist.path);
      const playlistText = `#EXTM3U
#EXT-X-VERSION:${version}
` + (!this.isLive ? "#EXT-X-PLAYLIST-TYPE:VOD\n" : "") + `#EXT-X-TARGETDURATION:${Math.ceil(targetDuration)}
` + (Number.isFinite(this.maxLiveSegmentCount) ? `#EXT-X-MEDIA-SEQUENCE:${playlist.mediaSequence}
` : "") + "#EXT-X-INDEPENDENT-SEGMENTS\n" + (isKeyPacketsOnly ? "#EXT-X-I-FRAMES-ONLY\n" : "") + (playlist.initSegment ? `#EXT-X-MAP:URI="${playlist.initSegment.path}"` + (playlist.initSegment.byteOffset !== null ? `,BYTERANGE="${playlist.initSegment.byteSize}@${playlist.initSegment.byteOffset}"` : "") + "\n" : "") + "\n" + playlist.writtenSegments.map((segment) => `#EXTINF:${+segment.duration.toFixed(12)},
` + (this.isRelativeToUnixEpoch ? `#EXT-X-PROGRAM-DATE-TIME:${new Date(1e3 * segment.timestamp).toISOString()}
` : "") + (segment.byteOffset !== null ? `#EXT-X-BYTERANGE:${segment.byteSize}@${segment.byteOffset}
` : "") + `${segment.path}
`).join("") + (playlist.done ? (playlist.writtenSegments.length > 0 ? "\n" : "") + "#EXT-X-ENDLIST\n" : "");
      this.format._options.onPlaylist?.(playlistText, toPlaylistInfo(playlist));
      const target = await this.output._getTarget({
        path: playlistPath,
        isRoot: false,
        mimeType: HLS_MIME_TYPE
      });
      const writer = new Writer(target, true);
      writer.start();
      writer.write(textEncoder.encode(playlistText));
      await writer.flush();
      await writer.finalize();
    }
    async writeMasterPlaylist() {
      assert(this.output._target instanceof PathedTarget);
      const pathedTarget = this.output._target;
      let masterPlaylistText = "#EXTM3U\n";
      let firstVariantWritten = false;
      let lastGroupId = null;
      let groupIdTrackCount = 0;
      let hasHadDefaultTrackInGroup = false;
      for (const decl of this.playlistDeclarations) {
        if (decl.groupId === null) {
          const isKeyPacketsOnly = decl.playlist.tracks[0].isVideoTrack() && decl.playlist.tracks[0].metadata.hasOnlyKeyPackets;
          const codecs = [];
          for (const track of decl.playlist.tracks) {
            const trackData = this.trackDatas.find((x) => x.track === track);
            const codecString = trackData?.info.decoderConfig.codec ?? track.source._codec;
            codecs.push(codecString);
          }
          let peakDeclBitrate = 0;
          let maxRefAverageBitrate = 0;
          if (decl.references.length > 0) {
            const firstRef = decl.references[0];
            const firstTrack = firstRef.playlist.tracks[0];
            const trackData = this.trackDatas.find((x) => x.track === firstTrack);
            const codecString = trackData?.info.decoderConfig.codec ?? firstTrack.source._codec;
            codecs.push(codecString);
            for (const ref of decl.references) {
              assert(ref.playlist.peakBitrate !== null);
              peakDeclBitrate = Math.max(peakDeclBitrate, ref.playlist.peakBitrate);
              maxRefAverageBitrate = Math.max(maxRefAverageBitrate, ref.playlist.averageBitrate ?? 0);
            }
          }
          assert(decl.playlist.peakBitrate !== null);
          const totalPeakBitrate = decl.playlist.peakBitrate + peakDeclBitrate;
          const totalAverageBitrate = (decl.playlist.averageBitrate ?? 0) + maxRefAverageBitrate;
          if (!firstVariantWritten) {
            masterPlaylistText += "\n";
            firstVariantWritten = true;
          }
          if (isKeyPacketsOnly) {
            masterPlaylistText += `#EXT-X-I-FRAME-STREAM-INF:`;
          } else {
            masterPlaylistText += `#EXT-X-STREAM-INF:`;
          }
          masterPlaylistText += `BANDWIDTH=${Math.ceil(totalPeakBitrate)}`;
          if (totalAverageBitrate > 0) {
            masterPlaylistText += `,AVERAGE-BANDWIDTH=${Math.ceil(totalAverageBitrate)}`;
          }
          masterPlaylistText += `,CODECS="${codecs.join(",")}"`;
          const videoTrack = decl.playlist.tracks.find((x) => x.isVideoTrack());
          if (videoTrack?.isVideoTrack()) {
            const trackData = this.trackDatas.find((x) => x.track === videoTrack);
            const decoderConfig = trackData?.info.decoderConfig;
            if (decoderConfig) {
              let width = decoderConfig.displayAspectWidth ?? decoderConfig.codedWidth;
              let height = decoderConfig.displayAspectHeight ?? decoderConfig.codedHeight;
              if (width !== void 0 && height !== void 0) {
                if (videoTrack.metadata.rotation !== void 0 && videoTrack.metadata.rotation % 180 === 90) {
                  [width, height] = [height, width];
                }
                masterPlaylistText += `,RESOLUTION=${width}x${height}`;
              }
            }
            if (!isKeyPacketsOnly && videoTrack.metadata.frameRate !== void 0) {
              masterPlaylistText += `,FRAME-RATE=${+videoTrack.metadata.frameRate.toFixed(3)}`;
            }
          }
          if (!isKeyPacketsOnly) {
            const groupIdForType = /* @__PURE__ */ new Map();
            for (const ref of decl.references) {
              assert(ref.groupId !== null);
              const type = ref.playlist.tracks[0].type;
              groupIdForType.set(type, ref.groupId);
            }
            for (const [type, id] of groupIdForType) {
              masterPlaylistText += `,${type.toUpperCase()}="${id}"`;
            }
          }
          if (isKeyPacketsOnly) {
            masterPlaylistText += `,URI="${decl.playlist.path}"`;
            masterPlaylistText += "\n";
          } else {
            masterPlaylistText += "\n";
            masterPlaylistText += `${decl.playlist.path}
`;
          }
        } else {
          assert(decl.playlist.tracks.length === 1);
          const track = decl.playlist.tracks[0];
          const type = track.type;
          let name = track.metadata.name ?? null;
          const languageCode = track.metadata.languageCode;
          const disposition = track.metadata.disposition;
          if (lastGroupId === null || decl.groupId !== lastGroupId) {
            groupIdTrackCount = 0;
            masterPlaylistText += "\n";
            hasHadDefaultTrackInGroup = false;
          }
          lastGroupId = decl.groupId;
          groupIdTrackCount++;
          masterPlaylistText += `#EXT-X-MEDIA:TYPE=${type.toUpperCase()},GROUP-ID="${decl.groupId}"`;
          if (name !== null && /[\n\r"]/.test(name)) {
            Logging._warn(
              "Dropping track name since it includes a line feed, carriage return, or double quote character, which are not allowed in HLS playlist attributes."
            );
            name = null;
          }
          name ??= `${languageCode ?? decl.groupId}-${groupIdTrackCount}`;
          masterPlaylistText += `,NAME="${name}"`;
          if (languageCode !== void 0) {
            masterPlaylistText += `,LANGUAGE="${languageCode}"`;
          }
          const dispositionPrimary = disposition?.primary ?? false;
          const dispositionDefault = disposition?.default ?? true;
          const dispositionForced = disposition?.forced ?? false;
          if (dispositionPrimary && !hasHadDefaultTrackInGroup) {
            masterPlaylistText += ",DEFAULT=YES";
            hasHadDefaultTrackInGroup = true;
          }
          if (dispositionPrimary || dispositionDefault) {
            masterPlaylistText += ",AUTOSELECT=YES";
          }
          if (dispositionForced) {
            masterPlaylistText += ",FORCED=YES";
          }
          if (type === "audio") {
            const trackData = this.trackDatas.find((x) => x.track === track);
            const decoderConfig = trackData?.info.decoderConfig;
            if (decoderConfig) {
              masterPlaylistText += `,CHANNELS="${decoderConfig.numberOfChannels}"`;
            }
          }
          if (!decl.noUri) {
            masterPlaylistText += `,URI="${decl.playlist.path}"`;
          }
          masterPlaylistText += "\n";
        }
      }
      this.format._options.onMaster?.(masterPlaylistText);
      const release = await this.mutex.acquire();
      try {
        let writer;
        if (this.numWrittenMasterPlaylists === 0) {
          writer = await this.output._getRootWriter(true);
        } else {
          const target = await this.output._getTarget({
            path: pathedTarget.rootPath,
            isRoot: true,
            mimeType: HLS_MIME_TYPE
          });
          writer = new Writer(target, true);
          writer.start();
        }
        writer.write(textEncoder.encode(masterPlaylistText));
        await writer.flush();
        await writer.finalize();
        this.numWrittenMasterPlaylists++;
      } finally {
        release();
      }
    }
    async tryWriteMasterPlaylist() {
      assert(this.isLive);
      for (const playlist of this.playlists) {
        if (playlist.writtenSegments.length === 0 && !playlist.done) {
          return;
        }
      }
      await this.writeMasterPlaylist();
    }
    async finalize() {
      const releases = await Promise.all(this.playlists.map((p) => p.mutex.acquire()));
      releases.forEach((release) => release());
      for (const trackData of this.trackDatas) {
        trackData.closed = true;
      }
      await Promise.all(this.playlists.map((playlist) => playlist.done ? Promise.resolve() : this.advancePlaylist(playlist)));
      if (!this.isLive) {
        await this.writeMasterPlaylist();
      }
    }
  };
  var validatePlaylistPath = (path) => {
    if (typeof path !== "string") {
      throw new TypeError("options.getPlaylistPath must return or resolve to a string");
    }
    if (/[\n\r"]/.test(path)) {
      throw new TypeError(
        "Playlist paths cannot contain line feed, carriage return, or double quote characters."
      );
    }
  };
  var validateSegmentPath = (path) => {
    if (typeof path !== "string") {
      throw new TypeError("options.getSegmentPath must return or resolve to a string");
    }
    if (/[\n\r"]/.test(path)) {
      throw new TypeError(
        "Segment paths cannot contain line feed or carriage return characters."
      );
    }
  };
  var validateInitPath = (path) => {
    if (typeof path !== "string") {
      throw new TypeError("options.getInitPath must return or resolve to a string");
    }
    if (/[\n\r"]/.test(path)) {
      throw new TypeError(
        "Init paths cannot contain line feed, carriage return, or double quote characters."
      );
    }
  };
  var toPlaylistInfo = (playlist) => {
    return {
      n: playlist.id,
      tracks: playlist.tracks,
      segmentFormat: playlist.segmentFormat
    };
  };

  // src/output-format.ts
  var OutputFormat = class {
    /** Returns a list of video codecs that this output format can contain. */
    getSupportedVideoCodecs() {
      return this.getSupportedCodecs().filter((codec) => VIDEO_CODECS.includes(codec));
    }
    /** Returns a list of audio codecs that this output format can contain. */
    getSupportedAudioCodecs() {
      return this.getSupportedCodecs().filter((codec) => AUDIO_CODECS.includes(codec));
    }
    /** Returns a list of subtitle codecs that this output format can contain. */
    getSupportedSubtitleCodecs() {
      return this.getSupportedCodecs().filter((codec) => SUBTITLE_CODECS.includes(codec));
    }
    /** @internal */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    _codecUnsupportedHint(codec) {
      return "";
    }
    /** @internal */
    _isFragmentedIsobmff() {
      return false;
    }
  };
  var IsobmffOutputFormat2 = class extends OutputFormat {
    /** Internal constructor. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.fastStart !== void 0 && ![false, "in-memory", "reserve", "fragmented"].includes(options.fastStart)) {
        throw new TypeError(
          "options.fastStart, when provided, must be false, 'in-memory', 'reserve', or 'fragmented'."
        );
      }
      if (options.minimumFragmentDuration !== void 0 && (!Number.isFinite(options.minimumFragmentDuration) || options.minimumFragmentDuration < 0)) {
        throw new TypeError("options.minimumFragmentDuration, when provided, must be a non-negative number.");
      }
      if (options.onFtyp !== void 0 && typeof options.onFtyp !== "function") {
        throw new TypeError("options.onFtyp, when provided, must be a function.");
      }
      if (options.onMoov !== void 0 && typeof options.onMoov !== "function") {
        throw new TypeError("options.onMoov, when provided, must be a function.");
      }
      if (options.onMdat !== void 0 && typeof options.onMdat !== "function") {
        throw new TypeError("options.onMdat, when provided, must be a function.");
      }
      if (options.onMoof !== void 0 && typeof options.onMoof !== "function") {
        throw new TypeError("options.onMoof, when provided, must be a function.");
      }
      if (options.metadataFormat !== void 0 && !["mdir", "mdta", "udta", "auto"].includes(options.metadataFormat)) {
        throw new TypeError(
          "options.metadataFormat, when provided, must be either 'auto', 'mdir', 'mdta', or 'udta'."
        );
      }
      super();
      this._options = options;
    }
    getSupportedTrackCounts() {
      const max = 2 ** 32 - 1;
      return {
        video: { min: 0, max },
        audio: { min: 0, max },
        subtitle: { min: 0, max },
        total: { min: 0, max }
      };
    }
    get supportsVideoRotationMetadata() {
      return true;
    }
    get supportsTimestampedMediaData() {
      return true;
    }
    /** @internal */
    _createMuxer(output) {
      return new IsobmffMuxer2(output, this);
    }
    /** @internal */
    _isFragmentedIsobmff() {
      return this._options.fastStart === "fragmented";
    }
  };
  var Mp4OutputFormat = class extends IsobmffOutputFormat2 {
    /** Creates a new {@link Mp4OutputFormat} configured with the specified `options`. */
    constructor(options) {
      super(options);
    }
    /** @internal */
    get _name() {
      return "MP4";
    }
    get fileExtension() {
      return ".mp4";
    }
    get mimeType() {
      return "video/mp4";
    }
    getSupportedCodecs() {
      return [
        ...VIDEO_CODECS,
        ...NON_PCM_AUDIO_CODECS,
        // These are supported via ISO/IEC 23003-5:
        "pcm-s16",
        "pcm-s16be",
        "pcm-s24",
        "pcm-s24be",
        "pcm-s32",
        "pcm-s32be",
        "pcm-f32",
        "pcm-f32be",
        "pcm-f64",
        "pcm-f64be",
        ...SUBTITLE_CODECS
      ];
    }
    /** @internal */
    _codecUnsupportedHint(codec) {
      if (new MovOutputFormat().getSupportedCodecs().includes(codec)) {
        return " Switching to MOV will grant support for this codec.";
      }
      return "";
    }
  };
  var CmafOutputFormat = class extends IsobmffOutputFormat2 {
    /** Creates a new {@link CmafOutputFormat} configured with the specified `options`. */
    constructor(options) {
      super(options);
    }
    /** @internal */
    get _name() {
      return "CMAF";
    }
    get fileExtension() {
      return ".m4s";
    }
    get mimeType() {
      return "video/mp4";
    }
    getSupportedCodecs() {
      return [
        ...VIDEO_CODECS,
        ...NON_PCM_AUDIO_CODECS,
        // These are supported via ISO/IEC 23003-5:
        "pcm-s16",
        "pcm-s16be",
        "pcm-s24",
        "pcm-s24be",
        "pcm-s32",
        "pcm-s32be",
        "pcm-f32",
        "pcm-f32be",
        "pcm-f64",
        "pcm-f64be",
        ...SUBTITLE_CODECS
      ];
    }
  };
  var MovOutputFormat = class extends IsobmffOutputFormat2 {
    /** Creates a new {@link MovOutputFormat} configured with the specified `options`. */
    constructor(options) {
      super(options);
    }
    /** @internal */
    get _name() {
      return "MOV";
    }
    get fileExtension() {
      return ".mov";
    }
    get mimeType() {
      return "video/quicktime";
    }
    getSupportedCodecs() {
      return [
        ...VIDEO_CODECS,
        ...AUDIO_CODECS
      ];
    }
    /** @internal */
    _codecUnsupportedHint(codec) {
      if (new Mp4OutputFormat().getSupportedCodecs().includes(codec)) {
        return " Switching to MP4 will grant support for this codec.";
      }
      return "";
    }
  };
  var MkvOutputFormat2 = class extends OutputFormat {
    /** Creates a new {@link MkvOutputFormat} configured with the specified `options`. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.appendOnly !== void 0 && typeof options.appendOnly !== "boolean") {
        throw new TypeError("options.appendOnly, when provided, must be a boolean.");
      }
      if (options.minimumClusterDuration !== void 0 && (!Number.isFinite(options.minimumClusterDuration) || options.minimumClusterDuration < 0)) {
        throw new TypeError("options.minimumClusterDuration, when provided, must be a non-negative number.");
      }
      if (options.onEbmlHeader !== void 0 && typeof options.onEbmlHeader !== "function") {
        throw new TypeError("options.onEbmlHeader, when provided, must be a function.");
      }
      if (options.onSegmentHeader !== void 0 && typeof options.onSegmentHeader !== "function") {
        throw new TypeError("options.onHeader, when provided, must be a function.");
      }
      if (options.onCluster !== void 0 && typeof options.onCluster !== "function") {
        throw new TypeError("options.onCluster, when provided, must be a function.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new MatroskaMuxer(output, this);
    }
    /** @internal */
    get _name() {
      return "Matroska";
    }
    getSupportedTrackCounts() {
      const max = 127;
      return {
        video: { min: 0, max },
        audio: { min: 0, max },
        subtitle: { min: 0, max },
        total: { min: 0, max }
      };
    }
    get fileExtension() {
      return ".mkv";
    }
    get mimeType() {
      return "video/x-matroska";
    }
    getSupportedCodecs() {
      return [
        ...VIDEO_CODECS,
        ...NON_PCM_AUDIO_CODECS,
        ...PCM_AUDIO_CODECS.filter((codec) => !["pcm-s8", "pcm-f32be", "pcm-f64be", "ulaw", "alaw"].includes(codec)),
        ...SUBTITLE_CODECS
      ];
    }
    get supportsVideoRotationMetadata() {
      return false;
    }
    get supportsTimestampedMediaData() {
      return true;
    }
  };
  var WebMOutputFormat = class extends MkvOutputFormat2 {
    /** Creates a new {@link WebMOutputFormat} configured with the specified `options`. */
    constructor(options) {
      super(options);
    }
    getSupportedCodecs() {
      return [
        ...VIDEO_CODECS.filter((codec) => ["vp8", "vp9", "av1"].includes(codec)),
        ...AUDIO_CODECS.filter((codec) => ["opus", "vorbis"].includes(codec)),
        ...SUBTITLE_CODECS
      ];
    }
    /** @internal */
    get _name() {
      return "WebM";
    }
    get fileExtension() {
      return ".webm";
    }
    get mimeType() {
      return "video/webm";
    }
    /** @internal */
    _codecUnsupportedHint(codec) {
      if (new MkvOutputFormat2().getSupportedCodecs().includes(codec)) {
        return " Switching to MKV will grant support for this codec.";
      }
      return "";
    }
  };
  var Mp3OutputFormat = class extends OutputFormat {
    /** Creates a new {@link Mp3OutputFormat} configured with the specified `options`. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.xingHeader !== void 0 && typeof options.xingHeader !== "boolean") {
        throw new TypeError("options.xingHeader, when provided, must be a boolean.");
      }
      if (options.onXingFrame !== void 0 && typeof options.onXingFrame !== "function") {
        throw new TypeError("options.onXingFrame, when provided, must be a function.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new Mp3Muxer(output, this);
    }
    /** @internal */
    get _name() {
      return "MP3";
    }
    getSupportedTrackCounts() {
      return {
        video: { min: 0, max: 0 },
        audio: { min: 1, max: 1 },
        subtitle: { min: 0, max: 0 },
        total: { min: 1, max: 1 }
      };
    }
    get fileExtension() {
      return ".mp3";
    }
    get mimeType() {
      return "audio/mpeg";
    }
    getSupportedCodecs() {
      return ["mp3"];
    }
    get supportsVideoRotationMetadata() {
      return false;
    }
    get supportsTimestampedMediaData() {
      return false;
    }
  };
  var WavOutputFormat = class extends OutputFormat {
    /** Creates a new {@link WavOutputFormat} configured with the specified `options`. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.large !== void 0 && typeof options.large !== "boolean") {
        throw new TypeError("options.large, when provided, must be a boolean.");
      }
      if (options.metadataFormat !== void 0 && !["info", "id3"].includes(options.metadataFormat)) {
        throw new TypeError("options.metadataFormat, when provided, must be either 'info' or 'id3'.");
      }
      if (options.onHeader !== void 0 && typeof options.onHeader !== "function") {
        throw new TypeError("options.onHeader, when provided, must be a function.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new WaveMuxer(output, this);
    }
    /** @internal */
    get _name() {
      return "WAVE";
    }
    getSupportedTrackCounts() {
      return {
        video: { min: 0, max: 0 },
        audio: { min: 1, max: 1 },
        subtitle: { min: 0, max: 0 },
        total: { min: 1, max: 1 }
      };
    }
    get fileExtension() {
      return ".wav";
    }
    get mimeType() {
      return "audio/wav";
    }
    getSupportedCodecs() {
      return [
        ...PCM_AUDIO_CODECS.filter(
          (codec) => ["pcm-s16", "pcm-s24", "pcm-s32", "pcm-f32", "pcm-f64", "pcm-u8", "ulaw", "alaw"].includes(codec)
        )
      ];
    }
    get supportsVideoRotationMetadata() {
      return false;
    }
    get supportsTimestampedMediaData() {
      return false;
    }
  };
  var OggOutputFormat = class extends OutputFormat {
    /** Creates a new {@link OggOutputFormat} configured with the specified `options`. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.maximumPageDuration !== void 0 && (!Number.isFinite(options.maximumPageDuration) || options.maximumPageDuration <= 0)) {
        throw new TypeError("options.maximumPageDuration, when provided, must be a positive number.");
      }
      if (options.onPage !== void 0 && typeof options.onPage !== "function") {
        throw new TypeError("options.onPage, when provided, must be a function.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new OggMuxer(output, this);
    }
    /** @internal */
    get _name() {
      return "Ogg";
    }
    getSupportedTrackCounts() {
      const max = 2 ** 32;
      return {
        video: { min: 0, max: 0 },
        audio: { min: 0, max },
        subtitle: { min: 0, max: 0 },
        total: { min: 0, max }
      };
    }
    get fileExtension() {
      return ".ogg";
    }
    get mimeType() {
      return "application/ogg";
    }
    getSupportedCodecs() {
      return [
        ...AUDIO_CODECS.filter((codec) => ["vorbis", "opus"].includes(codec))
      ];
    }
    get supportsVideoRotationMetadata() {
      return false;
    }
    get supportsTimestampedMediaData() {
      return false;
    }
  };
  var AdtsOutputFormat = class extends OutputFormat {
    /** Creates a new {@link AdtsOutputFormat} configured with the specified `options`. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.onFrame !== void 0 && typeof options.onFrame !== "function") {
        throw new TypeError("options.onFrame, when provided, must be a function.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new AdtsMuxer(output, this);
    }
    /** @internal */
    get _name() {
      return "ADTS";
    }
    getSupportedTrackCounts() {
      return {
        video: { min: 0, max: 0 },
        audio: { min: 1, max: 1 },
        subtitle: { min: 0, max: 0 },
        total: { min: 1, max: 1 }
      };
    }
    get fileExtension() {
      return ".aac";
    }
    get mimeType() {
      return "audio/aac";
    }
    getSupportedCodecs() {
      return ["aac"];
    }
    get supportsVideoRotationMetadata() {
      return false;
    }
    get supportsTimestampedMediaData() {
      return false;
    }
  };
  var FlacOutputFormat = class extends OutputFormat {
    /** Creates a new {@link FlacOutputFormat} configured with the specified `options`. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.appendOnly !== void 0 && typeof options.appendOnly !== "boolean") {
        throw new TypeError("options.appendOnly, when provided, must be a boolean.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new FlacMuxer(output, this);
    }
    /** @internal */
    get _name() {
      return "FLAC";
    }
    getSupportedTrackCounts() {
      return {
        video: { min: 0, max: 0 },
        audio: { min: 1, max: 1 },
        subtitle: { min: 0, max: 0 },
        total: { min: 1, max: 1 }
      };
    }
    get fileExtension() {
      return ".flac";
    }
    get mimeType() {
      return "audio/flac";
    }
    getSupportedCodecs() {
      return ["flac"];
    }
    get supportsVideoRotationMetadata() {
      return false;
    }
    get supportsTimestampedMediaData() {
      return false;
    }
  };
  var MpegTsOutputFormat = class extends OutputFormat {
    /** Creates a new {@link MpegTsOutputFormat} configured with the specified `options`. */
    constructor(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.onPacket !== void 0 && typeof options.onPacket !== "function") {
        throw new TypeError("options.onPacket, when provided, must be a function.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new MpegTsMuxer(output, this);
    }
    /** @internal */
    get _name() {
      return "MPEG-TS";
    }
    getSupportedTrackCounts() {
      const maxVideo = 16;
      const maxAudio = 32;
      const maxTotal = maxVideo + maxAudio;
      return {
        video: { min: 0, max: maxVideo },
        audio: { min: 0, max: maxAudio },
        subtitle: { min: 0, max: 0 },
        total: { min: 0, max: maxTotal }
      };
    }
    get fileExtension() {
      return ".ts";
    }
    get mimeType() {
      return "video/MP2T";
    }
    getSupportedCodecs() {
      return [
        ...VIDEO_CODECS.filter((codec) => ["avc", "hevc"].includes(codec)),
        ...AUDIO_CODECS.filter((codec) => ["aac", "mp3", "ac3", "eac3"].includes(codec))
      ];
    }
    get supportsVideoRotationMetadata() {
      return false;
    }
    get supportsTimestampedMediaData() {
      return true;
    }
  };
  var HlsOutputFormat = class extends OutputFormat {
    /** Creates a new {@link HlsOutputFormat} configured with the specified `options`. */
    constructor(options) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!(options.segmentFormat instanceof OutputFormat) && (!Array.isArray(options.segmentFormat) || options.segmentFormat.length === 0 || !options.segmentFormat.every((format) => format instanceof OutputFormat))) {
        throw new TypeError(
          "options.segmentFormat must be an OutputFormat or a non-empty array of OutputFormat instances."
        );
      }
      if (options.targetDuration !== void 0 && (typeof options.targetDuration !== "number" || options.targetDuration <= 0)) {
        throw new TypeError("options.targetDuration, when provided, must be a positive number.");
      }
      if (options.singleFilePerPlaylist !== void 0 && typeof options.singleFilePerPlaylist !== "boolean") {
        throw new TypeError("options.singleFilePerPlaylist, when provided, must be a boolean.");
      }
      if (options.live !== void 0 && typeof options.live !== "boolean") {
        throw new TypeError("options.live, when provided, must be a boolean.");
      }
      if (options.maxLiveSegmentCount !== void 0 && (typeof options.maxLiveSegmentCount !== "number" || options.maxLiveSegmentCount < 1 || Number.isFinite(options.maxLiveSegmentCount) && !Number.isInteger(options.maxLiveSegmentCount))) {
        throw new TypeError("options.maxLiveSegmentCount, when provided, must be a positive integer or Infinity.");
      }
      if (options.getPlaylistPath !== void 0 && typeof options.getPlaylistPath !== "function") {
        throw new TypeError("options.getPlaylistPath, when provided, must be a function.");
      }
      if (options.getSegmentPath !== void 0 && typeof options.getSegmentPath !== "function") {
        throw new TypeError("options.getSegmentPath, when provided, must be a function.");
      }
      if (options.getInitPath !== void 0 && typeof options.getInitPath !== "function") {
        throw new TypeError("options.getInitPath, when provided, must be a function.");
      }
      if (options.onMaster !== void 0 && typeof options.onMaster !== "function") {
        throw new TypeError("options.onMaster, when provided, must be a function.");
      }
      if (options.onPlaylist !== void 0 && typeof options.onPlaylist !== "function") {
        throw new TypeError("options.onPlaylist, when provided, must be a function.");
      }
      if (options.onSegment !== void 0 && typeof options.onSegment !== "function") {
        throw new TypeError("options.onSegment, when provided, must be a function.");
      }
      if (options.onInit !== void 0 && typeof options.onInit !== "function") {
        throw new TypeError("options.onInit, when provided, must be a function.");
      }
      if (options.onSegmentPopped !== void 0 && typeof options.onSegmentPopped !== "function") {
        throw new TypeError("options.onSegmentPopped, when provided, must be a function.");
      }
      super();
      this._options = options;
    }
    /** @internal */
    _createMuxer(output) {
      return new HlsMuxer(output, this);
    }
    /** @internal */
    get _name() {
      return "HTTP Live Streaming (HLS)";
    }
    get fileExtension() {
      return ".m3u8";
    }
    get mimeType() {
      return HLS_MIME_TYPE;
    }
    getSupportedCodecs() {
      const uniqueCodecs = new Set(toArray(this._options.segmentFormat).flatMap((x) => x.getSupportedCodecs()));
      return [...uniqueCodecs];
    }
    getSupportedTrackCounts() {
      let supportsVideo = false;
      let supportsAudio = false;
      let supportsSubtitle = false;
      for (const format of toArray(this._options.segmentFormat)) {
        const trackCounts = format.getSupportedTrackCounts();
        supportsVideo ||= trackCounts.video.max > 0;
        supportsAudio ||= trackCounts.audio.max > 0;
        supportsSubtitle ||= trackCounts.subtitle.max > 0;
      }
      return {
        video: { min: 0, max: supportsVideo ? Infinity : 0 },
        audio: { min: 0, max: supportsAudio ? Infinity : 0 },
        subtitle: { min: 0, max: 0 },
        // Currently disabled
        total: { min: 0, max: Infinity }
      };
    }
    get supportsVideoRotationMetadata() {
      return toArray(this._options.segmentFormat).some((format) => format.supportsVideoRotationMetadata);
    }
    get supportsTimestampedMediaData() {
      return true;
    }
    /** @internal */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    _codecUnsupportedHint(codec) {
      return ` Using different segment formats may grant support for this codec.`;
    }
  };

  // src/output.ts
  var ALL_TRACK_TYPES = ["video", "audio", "subtitle"];
  var OutputTrack2 = class _OutputTrack {
    /** @internal */
    constructor(id, output, type, source, metadata) {
      this.id = id;
      this.output = output;
      this.type = type;
      this.source = source;
      this.metadata = metadata;
    }
    /** Returns true if and only if this track is a video track. */
    isVideoTrack() {
      return this.type === "video";
    }
    /** Returns true if and only if this track is an audio track. */
    isAudioTrack() {
      return this.type === "audio";
    }
    /** Returns true if and only if this track is a subtitle track. */
    isSubtitleTrack() {
      return this.type === "subtitle";
    }
    /**
     * Returns true if and only if this track can be paired with the given other track. Pairability can be set using
     * the {@link BaseTrackMetadata.group} option.
     */
    canBePairedWith(other) {
      if (!(other instanceof _OutputTrack)) {
        throw new TypeError("other must be an OutputTrack.");
      }
      if (this === other) {
        return false;
      }
      const thisGroups = toArray(this.metadata.group);
      const otherGroups = toArray(other.metadata.group);
      for (const aGroup of thisGroups) {
        const pairableInSameGroup = this.type !== other.type && otherGroups.some((bGroup) => aGroup === bGroup);
        if (pairableInSameGroup) {
          return true;
        }
        const pairableAcrossGroups = otherGroups.some(
          (bGroup) => aGroup._pairedGroups.has(bGroup)
        );
        if (pairableAcrossGroups) {
          return true;
        }
      }
      return false;
    }
  };
  var OutputVideoTrack2 = class extends OutputTrack2 {
    /** @internal */
    constructor(id, output, source, metadata) {
      super(id, output, "video", source, metadata);
    }
  };
  var OutputAudioTrack2 = class extends OutputTrack2 {
    /** @internal */
    constructor(id, output, source, metadata) {
      super(id, output, "audio", source, metadata);
    }
  };
  var OutputSubtitleTrack2 = class extends OutputTrack2 {
    /** @internal */
    constructor(id, output, source, metadata) {
      super(id, output, "subtitle", source, metadata);
    }
  };
  var OutputTrackGroup = class _OutputTrackGroup {
    /** Creates a new {@link OutputTrackGroup}. */
    constructor() {
      /** @internal */
      this._pairedGroups = /* @__PURE__ */ new Set();
    }
    /**
     * Marks this group as being pairable with another group, symmetrically. Output tracks where each track is assigned
     * to one half of a group pairing are then considered pairable.
     *
     * You cannot pair a group with itself.
     */
    pairWith(other) {
      if (!(other instanceof _OutputTrackGroup)) {
        throw new TypeError("other must be an OutputTrackGroup.");
      }
      if (this === other) {
        throw new TypeError("Cannot pair a group with itself.");
      }
      this._pairedGroups.add(other);
      other._pairedGroups.add(this);
    }
  };
  var validateBaseTrackMetadata = (metadata) => {
    if (!metadata || typeof metadata !== "object") {
      throw new TypeError("metadata must be an object.");
    }
    if (metadata.languageCode !== void 0 && !isIso639Dash2LanguageCode(metadata.languageCode)) {
      throw new TypeError("metadata.languageCode, when provided, must be a three-letter, ISO 639-2/T language code.");
    }
    if (metadata.name !== void 0 && typeof metadata.name !== "string") {
      throw new TypeError("metadata.name, when provided, must be a string.");
    }
    if (metadata.disposition !== void 0) {
      validateTrackDisposition(metadata.disposition);
    }
    if (metadata.maximumPacketCount !== void 0 && (!Number.isInteger(metadata.maximumPacketCount) || metadata.maximumPacketCount < 0)) {
      throw new TypeError("metadata.maximumPacketCount, when provided, must be a non-negative integer.");
    }
    if (metadata.group !== void 0 && !(metadata.group instanceof OutputTrackGroup) && (!Array.isArray(metadata.group) || metadata.group.some((group) => !(group instanceof OutputTrackGroup)))) {
      throw new TypeError(
        "metadata.group, when provided, must be an OutputTrackGroup instance or an array of OutputTrackGroup instances."
      );
    }
  };
  var Output = class extends EventEmitter {
    /**
     * Creates a new instance of {@link Output} which can then be used to create a new media file according to the
     * specified {@link OutputOptions}.
     */
    constructor(options) {
      super();
      /** The current state of the output. */
      this.state = "pending";
      /**
       * The {@link OutputTrackGroup} that all tracks are assigned to by default unless otherwise specified by
       * {@link BaseTrackMetadata.group}.
       */
      this.defaultTrackGroup = new OutputTrackGroup();
      /**
       * The tracks that have been added to this output. Treat it as a readonly field; to add tracks, use the methods.
       */
      this.tracks = [];
      /** @internal */
      this._onFinalize = null;
      /** @internal */
      this._unfinalizedTargets = /* @__PURE__ */ new Set();
      /** @internal */
      this._rootWriterPromise = null;
      /** @internal */
      this._startPromise = null;
      /** @internal */
      this._cancelPromise = null;
      /** @internal */
      this._finalizePromise = null;
      /** @internal */
      this._mutex = new AsyncMutex();
      /** @internal */
      this._metadataTags = {};
      /** @internal */
      this._rootTarget = null;
      /** @internal */
      this._rootTargetPromise = null;
      /**
       * This field is used to synchronize multiple MediaStreamTracks. They use the same time coordinate system across
       * tracks, and to ensure correct audio-video sync, we must use the same offset for all of them. The reason an offset
       * is needed at all is because the timestamps typically don't start at zero.
       * @internal
       */
      this._firstMediaStreamTimestamp = null;
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!(options.format instanceof OutputFormat)) {
        throw new TypeError("options.format must be an OutputFormat.");
      }
      if (!(options.target instanceof Target || options.target instanceof PathedTarget)) {
        throw new TypeError("options.target must be a Target or a PathedTarget.");
      }
      if (options.target instanceof Target) {
        this._rememberTarget(options.target);
      }
      if (options.initTarget !== void 0 && !(options.initTarget instanceof Target) && typeof options.initTarget !== "function") {
        throw new Error(
          "options.initTarget, when provided, must be a Target or a function that returns or resolves to a Target."
        );
      }
      if (options.onFinalize !== void 0 && typeof options.onFinalize !== "function") {
        throw new TypeError("options.onFinalize, when provided, must be a function.");
      }
      this.format = options.format;
      this._target = options.target;
      this._onFinalize = options.onFinalize ?? null;
      this._initTarget = options.initTarget ?? null;
      if (this._initTarget instanceof Target) {
        this._rememberTarget(this._initTarget);
      }
      this._muxer = options.format._createMuxer(this);
    }
    /**
     * The target to which the root file will be written. Throws when using {@link PathedTarget} with an async callback;
     * prefer the `'target'` event for those cases.
     */
    get target() {
      const errorMessage = "Output.target cannot be used when using PathedTarget with an async callback. Use the 'target' event instead.";
      if (this._rootTargetPromise) {
        throw new TypeError(errorMessage);
      }
      const rootTargetResult = this._getRootTarget();
      if (rootTargetResult instanceof Promise) {
        throw new TypeError(errorMessage);
      }
      return rootTargetResult;
    }
    /** @internal */
    _getTargetValidated(request) {
      assert(this._target instanceof PathedTarget);
      const result = this._target.getTarget(request);
      const handleResult = (result2) => {
        if (!(result2 instanceof Target)) {
          throw new TypeError("getTarget must return a Target.");
        }
        return result2;
      };
      if (result instanceof Promise) {
        return result.then(handleResult);
      } else {
        return handleResult(result);
      }
    }
    /** @internal */
    async _getTarget(request) {
      assert(this._target instanceof PathedTarget);
      const target = await this._getTargetValidated(request);
      this._emit("target", { target, request, isRoot: request.isRoot });
      if (this.state === "canceled") {
        await target._close();
      } else {
        this._rememberTarget(target);
      }
      return target;
    }
    /** @internal */
    _rememberTarget(target) {
      this._unfinalizedTargets.add(target);
      target.on("finalized", () => this._unfinalizedTargets.delete(target), { once: true });
    }
    /** @internal */
    async _getInitTarget() {
      assert(this._initTarget !== null);
      if (this._initTarget instanceof Target) {
        return this._initTarget;
      }
      const target = await this._initTarget();
      if (this.state === "canceled") {
        await target._close();
      } else {
        this._rememberTarget(target);
      }
      return target;
    }
    /** @internal */
    _hasInitTarget() {
      return this._initTarget !== null;
    }
    /** @internal */
    _getRootTarget() {
      if (this._rootTarget) {
        return this._rootTarget;
      }
      if (this._rootTargetPromise) {
        return this._rootTargetPromise;
      }
      if (this._target instanceof Target) {
        this._emit("target", { target: this._target, request: null, isRoot: true });
        this._rootTarget = this._target;
        return this._target;
      }
      const request = {
        path: this._target.rootPath,
        isRoot: true,
        mimeType: this.format.mimeType
      };
      const result = this._getTargetValidated(request);
      const handleResult = (target) => {
        if (this.state === "canceled") {
          void target._close();
        } else {
          this._rememberTarget(target);
        }
        this._emit("target", { target, request, isRoot: true });
        this._rootTarget = target;
        return target;
      };
      if (result instanceof Promise) {
        return this._rootTargetPromise = result.then(handleResult);
      } else {
        return handleResult(result);
      }
    }
    /** @internal */
    _getRootWriter(isMonotonic) {
      return this._rootWriterPromise ??= (async () => {
        const target = await this._getRootTarget();
        const writer = new Writer(target, typeof isMonotonic === "boolean" ? isMonotonic : isMonotonic(target));
        writer.start();
        return writer;
      })();
    }
    /** Adds a video track to the output with the given source. Can only be called before the output is started. */
    addVideoTrack(source, metadata = {}) {
      if (!(source instanceof VideoSource)) {
        throw new TypeError("source must be a VideoSource.");
      }
      validateBaseTrackMetadata(metadata);
      if (metadata.rotation !== void 0 && ![0, 90, 180, 270].includes(metadata.rotation)) {
        throw new TypeError(`Invalid video rotation: ${metadata.rotation}. Has to be 0, 90, 180 or 270.`);
      }
      if (!this.format.supportsVideoRotationMetadata && metadata.rotation) {
        throw new Error(`${this.format._name} does not support video rotation metadata.`);
      }
      if (metadata.frameRate !== void 0 && (!Number.isFinite(metadata.frameRate) || metadata.frameRate <= 0)) {
        throw new TypeError(
          `Invalid video frame rate: ${metadata.frameRate}. Must be a positive number.`
        );
      }
      if (metadata.decoderConfig !== void 0) {
        validateVideoChunkMetadata({ decoderConfig: metadata.decoderConfig }, source._codec);
      }
      if (metadata.primingPacket !== void 0) {
        if (!(metadata.primingPacket instanceof EncodedPacket)) {
          throw new TypeError("metadata.primingPacket, when provided, must be an EncodedPacket.");
        }
        if (metadata.decoderConfig === void 0) {
          throw new TypeError("metadata.primingPacket can only be provided alongside metadata.decoderConfig.");
        }
      }
      const metadataCopy = { ...metadata };
      metadataCopy.group ??= this.defaultTrackGroup;
      return this._addTrack(new OutputVideoTrack2(
        this.tracks.length + 1,
        this,
        source,
        metadataCopy
      ));
    }
    /** Adds an audio track to the output with the given source. Can only be called before the output is started. */
    addAudioTrack(source, metadata = {}) {
      if (!(source instanceof AudioSource)) {
        throw new TypeError("source must be an AudioSource.");
      }
      validateBaseTrackMetadata(metadata);
      if (metadata.decoderConfig !== void 0) {
        validateAudioChunkMetadata({ decoderConfig: metadata.decoderConfig }, source._codec);
      }
      if (metadata.primingPacket !== void 0) {
        if (!(metadata.primingPacket instanceof EncodedPacket)) {
          throw new TypeError("metadata.primingPacket, when provided, must be an EncodedPacket.");
        }
        if (metadata.decoderConfig === void 0) {
          throw new TypeError("metadata.primingPacket can only be provided alongside metadata.decoderConfig.");
        }
      }
      const metadataCopy = { ...metadata };
      metadataCopy.group ??= this.defaultTrackGroup;
      return this._addTrack(new OutputAudioTrack2(
        this.tracks.length + 1,
        this,
        source,
        metadataCopy
      ));
    }
    /** Adds a subtitle track to the output with the given source. Can only be called before the output is started. */
    addSubtitleTrack(source, metadata = {}) {
      if (!(source instanceof SubtitleSource)) {
        throw new TypeError("source must be a SubtitleSource.");
      }
      validateBaseTrackMetadata(metadata);
      const metadataCopy = { ...metadata };
      metadataCopy.group ??= this.defaultTrackGroup;
      return this._addTrack(new OutputSubtitleTrack2(
        this.tracks.length + 1,
        this,
        source,
        metadataCopy
      ));
    }
    /**
     * Sets descriptive metadata tags about the media file, such as title, author, date, or cover art. When called
     * multiple times, only the metadata from the last call will be used.
     *
     * Can only be called before the output is started.
     */
    setMetadataTags(tags) {
      validateMetadataTags(tags);
      if (this.state !== "pending") {
        throw new Error("Cannot set metadata tags after output has been started or canceled.");
      }
      this._metadataTags = tags;
    }
    /** @internal */
    _addTrack(track) {
      if (this.state !== "pending") {
        throw new Error("Cannot add track after output has been started or canceled.");
      }
      if (track.source._connectedTrack) {
        throw new Error("Source is already used for a track.");
      }
      const supportedTrackCounts = this.format.getSupportedTrackCounts();
      const presentTracksOfThisType = this.tracks.reduce(
        (count, t) => count + (t.type === track.type ? 1 : 0),
        0
      );
      const maxCount = supportedTrackCounts[track.type].max;
      if (presentTracksOfThisType === maxCount) {
        throw new Error(
          maxCount === 0 ? `${this.format._name} does not support ${track.type} tracks.` : `${this.format._name} does not support more than ${maxCount} ${track.type} track${maxCount === 1 ? "" : "s"}.`
        );
      }
      const maxTotalCount = supportedTrackCounts.total.max;
      if (this.tracks.length === maxTotalCount) {
        throw new Error(
          `${this.format._name} does not support more than ${maxTotalCount} tracks${maxTotalCount === 1 ? "" : "s"} in total.`
        );
      }
      if (track.isVideoTrack()) {
        const supportedVideoCodecs = this.format.getSupportedVideoCodecs();
        if (supportedVideoCodecs.length === 0) {
          throw new Error(
            `${this.format._name} does not support video tracks.` + this.format._codecUnsupportedHint(track.source._codec)
          );
        } else if (!supportedVideoCodecs.includes(track.source._codec)) {
          throw new Error(
            `Codec '${track.source._codec}' cannot be contained within ${this.format._name}. Supported video codecs are: ${supportedVideoCodecs.map((codec) => `'${codec}'`).join(", ")}.` + this.format._codecUnsupportedHint(track.source._codec)
          );
        }
      } else if (track.isAudioTrack()) {
        const supportedAudioCodecs = this.format.getSupportedAudioCodecs();
        if (supportedAudioCodecs.length === 0) {
          throw new Error(
            `${this.format._name} does not support audio tracks.` + this.format._codecUnsupportedHint(track.source._codec)
          );
        } else if (!supportedAudioCodecs.includes(track.source._codec)) {
          throw new Error(
            `Codec '${track.source._codec}' cannot be contained within ${this.format._name}. Supported audio codecs are: ${supportedAudioCodecs.map((codec) => `'${codec}'`).join(", ")}.` + this.format._codecUnsupportedHint(track.source._codec)
          );
        }
      } else if (track.isSubtitleTrack()) {
        const supportedSubtitleCodecs = this.format.getSupportedSubtitleCodecs();
        if (supportedSubtitleCodecs.length === 0) {
          throw new Error(
            `${this.format._name} does not support subtitle tracks.` + this.format._codecUnsupportedHint(track.source._codec)
          );
        } else if (!supportedSubtitleCodecs.includes(track.source._codec)) {
          throw new Error(
            `Codec '${track.source._codec}' cannot be contained within ${this.format._name}. Supported subtitle codecs are: ${supportedSubtitleCodecs.map((codec) => `'${codec}'`).join(", ")}.` + this.format._codecUnsupportedHint(track.source._codec)
          );
        }
      }
      this.tracks.push(track);
      track.source._connectedTrack = track;
      return track;
    }
    /**
     * Whether the output has enough tracks (of the correct type) to be started, based on the requirements of the output
     * format.
     */
    hasEnoughTracks() {
      const supportedTrackCounts = this.format.getSupportedTrackCounts();
      for (const trackType of ALL_TRACK_TYPES) {
        const presentTracksOfThisType = this.tracks.reduce(
          (count, track) => count + (track.type === trackType ? 1 : 0),
          0
        );
        const minCount = supportedTrackCounts[trackType].min;
        if (presentTracksOfThisType < minCount) {
          return false;
        }
      }
      const totalMinCount = supportedTrackCounts.total.min;
      if (this.tracks.length < totalMinCount) {
        return false;
      }
      return true;
    }
    /**
     * Starts the creation of the output file. This method should be called after all tracks have been added. Only after
     * the output has started can media samples be added to the tracks.
     *
     * @returns A promise that resolves when the output has successfully started and is ready to receive media samples.
     */
    async start() {
      const supportedTrackCounts = this.format.getSupportedTrackCounts();
      for (const trackType of ALL_TRACK_TYPES) {
        const presentTracksOfThisType = this.tracks.reduce(
          (count, track) => count + (track.type === trackType ? 1 : 0),
          0
        );
        const minCount = supportedTrackCounts[trackType].min;
        if (presentTracksOfThisType < minCount) {
          throw new Error(
            minCount === supportedTrackCounts[trackType].max ? `${this.format._name} requires exactly ${minCount} ${trackType} track${minCount === 1 ? "" : "s"}.` : `${this.format._name} requires at least ${minCount} ${trackType} track${minCount === 1 ? "" : "s"}.`
          );
        }
      }
      const totalMinCount = supportedTrackCounts.total.min;
      if (this.tracks.length < totalMinCount) {
        throw new Error(
          totalMinCount === supportedTrackCounts.total.max ? `${this.format._name} requires exactly ${totalMinCount} track${totalMinCount === 1 ? "" : "s"}.` : `${this.format._name} requires at least ${totalMinCount} track${totalMinCount === 1 ? "" : "s"}.`
        );
      }
      if (this.state === "canceled") {
        throw new Error("Output has been canceled.");
      }
      if (this._startPromise) {
        Logging._warn("Output has already been started.");
        return this._startPromise;
      }
      return this._startPromise = (async () => {
        this.state = "started";
        const releasePromise = this._mutex.acquire();
        try {
          await this._muxer.start();
          const promises = this.tracks.map((track) => track.source._start());
          await Promise.all(promises);
        } finally {
          (await releasePromise)();
        }
      })();
    }
    /**
     * Resolves with the full MIME type of the output file, including track codecs.
     *
     * The returned promise will resolve only once the precise codec strings of all tracks are known.
     */
    getMimeType() {
      return this._muxer.getMimeType();
    }
    /**
     * Cancels the creation of the output file, releasing internal resources like encoders and preventing further
     * samples from being added.
     *
     * @returns A promise that resolves once all internal resources have been released.
     */
    async cancel() {
      if (this._cancelPromise) {
        Logging._warn("Output has already been canceled.");
        return this._cancelPromise;
      } else if (this.state === "finalizing" || this.state === "finalized") {
        if (this.state === "finalized") {
          Logging._warn("Output has already been finalized.");
        }
        return;
      }
      return this._cancelPromise = (async () => {
        this.state = "canceled";
        const release = await this._mutex.acquire();
        try {
          const promises = this.tracks.map((x) => x.source._flushOrWaitForOngoingClose(true));
          await Promise.all(promises);
          await Promise.all([...this._unfinalizedTargets].map((target) => target._close()));
          this._unfinalizedTargets.clear();
        } finally {
          release();
        }
      })();
    }
    /**
     * Finalizes the output file. This method must be called after all media samples across all tracks have been added.
     * Once the Promise returned by this method completes, the output file is ready.
     */
    async finalize() {
      if (this.state === "pending") {
        throw new Error("Cannot finalize before starting.");
      }
      if (this.state === "canceled") {
        throw new Error("Cannot finalize after canceling.");
      }
      if (this._finalizePromise) {
        Logging._warn("Output has already been finalized.");
        return this._finalizePromise;
      }
      return this._finalizePromise = (async () => {
        this.state = "finalizing";
        const release = await this._mutex.acquire();
        try {
          const promises = this.tracks.map((x) => x.source._flushOrWaitForOngoingClose(false));
          await Promise.all(promises);
          await this._muxer.finalize();
          if (this._rootWriterPromise) {
            const rootWriter = await this._rootWriterPromise;
            if (!rootWriter.finalized) {
              await rootWriter.flush();
              await rootWriter.finalize();
            }
          }
          if (this._onFinalize) {
            await this._onFinalize();
          }
          this.state = "finalized";
        } finally {
          await Promise.all([...this._unfinalizedTargets].map((target) => target._close().catch(() => {
          })));
          this._unfinalizedTargets.clear();
          release();
        }
      })();
    }
  };

  // src/conversion.ts
  var validateVideoOptions = (videoOptions) => {
    if (!videoOptions || typeof videoOptions !== "object") {
      throw new TypeError("options.video, when provided, must be an object.");
    }
    if (videoOptions?.discard !== void 0 && typeof videoOptions.discard !== "boolean") {
      throw new TypeError("options.video.discard, when provided, must be a boolean.");
    }
    if (videoOptions?.forceTranscode !== void 0 && typeof videoOptions.forceTranscode !== "boolean") {
      throw new TypeError("options.video.forceTranscode, when provided, must be a boolean.");
    }
    if (videoOptions?.codec !== void 0 && !VIDEO_CODECS.includes(videoOptions.codec)) {
      throw new TypeError(
        `options.video.codec, when provided, must be one of: ${VIDEO_CODECS.join(", ")}.`
      );
    }
    const bitrate = videoOptions?.bitrate;
    if (videoOptions?.quality !== void 0 && !(videoOptions.quality instanceof Quality)) {
      throw new TypeError("options.video.quality, when provided, must be a Quality.");
    }
    if (videoOptions?.quality !== void 0 && bitrate !== void 0) {
      throw new TypeError("options.video.quality and options.video.bitrate cannot both be provided.");
    }
    if (bitrate !== void 0 && !(bitrate instanceof Quality) && (!Number.isInteger(bitrate) || bitrate <= 0)) {
      throw new TypeError("options.video.bitrate, when provided, must be a positive integer or a quality.");
    }
    if (videoOptions?.width !== void 0 && (!Number.isInteger(videoOptions.width) || videoOptions.width <= 0)) {
      throw new TypeError("options.video.width, when provided, must be a positive integer.");
    }
    if (videoOptions?.height !== void 0 && (!Number.isInteger(videoOptions.height) || videoOptions.height <= 0)) {
      throw new TypeError("options.video.height, when provided, must be a positive integer.");
    }
    if (videoOptions?.fit !== void 0 && !["fill", "contain", "cover"].includes(videoOptions.fit)) {
      throw new TypeError("options.video.fit, when provided, must be one of 'fill', 'contain', or 'cover'.");
    }
    if (videoOptions?.width !== void 0 && videoOptions.height !== void 0 && videoOptions.fit === void 0) {
      throw new TypeError(
        "When both options.video.width and options.video.height are provided, options.video.fit must also be provided."
      );
    }
    if (videoOptions?.rotate !== void 0 && ![0, 90, 180, 270].includes(videoOptions.rotate)) {
      throw new TypeError("options.video.rotate, when provided, must be 0, 90, 180 or 270.");
    }
    if (videoOptions?.allowRotationMetadata !== void 0 && typeof videoOptions.allowRotationMetadata !== "boolean") {
      throw new TypeError("options.video.allowRotationMetadata, when provided, must be a boolean.");
    }
    if (videoOptions?.crop !== void 0) {
      validateCropRectangle(videoOptions.crop, "options.video.");
    }
    if (videoOptions?.frameRate !== void 0 && (!Number.isFinite(videoOptions.frameRate) || videoOptions.frameRate <= 0)) {
      throw new TypeError("options.video.frameRate, when provided, must be a finite positive number.");
    }
    if (videoOptions?.alpha !== void 0 && !["discard", "keep"].includes(videoOptions.alpha)) {
      throw new TypeError("options.video.alpha, when provided, must be either 'discard' or 'keep'.");
    }
    if (videoOptions?.keyFrameInterval !== void 0 && (!Number.isFinite(videoOptions.keyFrameInterval) || videoOptions.keyFrameInterval < 0)) {
      throw new TypeError("options.video.keyFrameInterval, when provided, must be a non-negative number.");
    }
    if (videoOptions?.process !== void 0 && typeof videoOptions.process !== "function") {
      throw new TypeError("options.video.process, when provided, must be a function.");
    }
    if (videoOptions?.processedWidth !== void 0 && (!Number.isInteger(videoOptions.processedWidth) || videoOptions.processedWidth <= 0)) {
      throw new TypeError("options.video.processedWidth, when provided, must be a positive integer.");
    }
    if (videoOptions?.processedHeight !== void 0 && (!Number.isInteger(videoOptions.processedHeight) || videoOptions.processedHeight <= 0)) {
      throw new TypeError("options.video.processedHeight, when provided, must be a positive integer.");
    }
    if (videoOptions?.hardwareAcceleration !== void 0 && !["no-preference", "prefer-hardware", "prefer-software"].includes(videoOptions.hardwareAcceleration)) {
      throw new TypeError(
        "options.video.hardwareAcceleration, when provided, must be 'no-preference', 'prefer-hardware' or 'prefer-software'."
      );
    }
    if (videoOptions?.group !== void 0 && !(videoOptions.group instanceof OutputTrackGroup || Array.isArray(videoOptions.group) && videoOptions.group.every((x) => x instanceof OutputTrackGroup))) {
      throw new TypeError(
        "options.video.group, when provided, must be an OutputTrackGroup or an array of OutputTrackGroups."
      );
    }
  };
  var validateAudioOptions = (audioOptions) => {
    if (!audioOptions || typeof audioOptions !== "object") {
      throw new TypeError("options.audio, when provided, must be an object.");
    }
    if (audioOptions?.discard !== void 0 && typeof audioOptions.discard !== "boolean") {
      throw new TypeError("options.audio.discard, when provided, must be a boolean.");
    }
    if (audioOptions?.forceTranscode !== void 0 && typeof audioOptions.forceTranscode !== "boolean") {
      throw new TypeError("options.audio.forceTranscode, when provided, must be a boolean.");
    }
    if (audioOptions?.codec !== void 0 && !AUDIO_CODECS.includes(audioOptions.codec)) {
      throw new TypeError(
        `options.audio.codec, when provided, must be one of: ${AUDIO_CODECS.join(", ")}.`
      );
    }
    const bitrate = audioOptions?.bitrate;
    if (audioOptions?.quality !== void 0 && !(audioOptions.quality instanceof Quality)) {
      throw new TypeError("options.audio.quality, when provided, must be a Quality.");
    }
    if (audioOptions?.quality !== void 0 && bitrate !== void 0) {
      throw new TypeError("options.audio.quality and options.audio.bitrate cannot both be provided.");
    }
    if (bitrate !== void 0 && !(bitrate instanceof Quality) && (!Number.isInteger(bitrate) || bitrate <= 0)) {
      throw new TypeError("options.audio.bitrate, when provided, must be a positive integer or a quality.");
    }
    if (audioOptions?.numberOfChannels !== void 0 && (!Number.isInteger(audioOptions.numberOfChannels) || audioOptions.numberOfChannels <= 0)) {
      throw new TypeError("options.audio.numberOfChannels, when provided, must be a positive integer.");
    }
    if (audioOptions?.sampleRate !== void 0 && (!Number.isInteger(audioOptions.sampleRate) || audioOptions.sampleRate <= 0)) {
      throw new TypeError("options.audio.sampleRate, when provided, must be a positive integer.");
    }
    if (audioOptions?.sampleFormat !== void 0 && !["u8", "s16", "s32", "f32"].includes(audioOptions.sampleFormat)) {
      throw new TypeError("options.audio.sampleFormat, when provided, must be one of: u8, s16, s32, f32.");
    }
    if (audioOptions?.process !== void 0 && typeof audioOptions.process !== "function") {
      throw new TypeError("options.audio.process, when provided, must be a function.");
    }
    if (audioOptions?.processedNumberOfChannels !== void 0 && (!Number.isInteger(audioOptions.processedNumberOfChannels) || audioOptions.processedNumberOfChannels <= 0)) {
      throw new TypeError("options.audio.processedNumberOfChannels, when provided, must be a positive integer.");
    }
    if (audioOptions?.processedSampleRate !== void 0 && (!Number.isInteger(audioOptions.processedSampleRate) || audioOptions.processedSampleRate <= 0)) {
      throw new TypeError("options.audio.processedSampleRate, when provided, must be a positive integer.");
    }
    if (audioOptions?.group !== void 0 && !(audioOptions.group instanceof OutputTrackGroup || Array.isArray(audioOptions.group) && audioOptions.group.every((x) => x instanceof OutputTrackGroup))) {
      throw new TypeError(
        "options.audio.group, when provided, must be an OutputTrackGroup or an array of OutputTrackGroups."
      );
    }
  };
  var FALLBACK_NUMBER_OF_CHANNELS = 2;
  var FALLBACK_SAMPLE_RATE = 48e3;
  var Conversion = class _Conversion {
    /** Creates a new Conversion instance (duh). */
    constructor(options) {
      /**
       * The current state of the conversion.
       *
       * - `'idle'`: The conversion is not currently executing and isn't done; `execute` can be called.
       * - `'executing'`: A call to `execute` is currently running.
       * - `'canceled'`: The conversion has been canceled and can no longer be executed.
       * - `'done'`: The conversion has run to completion. Subsequent calls to `execute` do nothing.
       */
      this.state = "idle";
      /** @internal */
      this._nextOutputTrackId = 0;
      /** @internal */
      this._outputTrackIds = [];
      /** @internal */
      this._outputOwnTrackGroups = [];
      /** @internal */
      this._trackPumps = [];
      /** @internal */
      this._composable = false;
      /** @internal */
      this._executed = false;
      /** @internal */
      this._executionUntil = Infinity;
      /** @internal */
      this._pauseRequested = false;
      /** @internal */
      this._synchronizer = new TrackSynchronizer(this);
      /** @internal */
      this._totalDuration = null;
      /** @internal */
      this._maxTimestamps = /* @__PURE__ */ new Map();
      // Track ID -> timestamp
      /**
       * A callback that is fired whenever the conversion progresses. Gets passed as first argument a number between
       * 0 and 1, indicating the completion of the conversion. Note that a progress of 1 doesn't necessarily mean the
       * conversion is complete; the conversion is complete once `execute()` resolves.
       *
       * As second argument, this callback receives the input time in seconds that has been processed.
       *
       * In order for progress to be computed, this property must be set before `execute` is called.
       */
      this.onProgress = void 0;
      /** @internal */
      this._computeProgress = false;
      /** @internal */
      this._lastProgress = 0;
      /**
       * Whether this conversion, as it has been configured, is valid and can be executed. If this field is `false`, check
       * the `discardedTracks` field for reasons. Composable conversions are always valid, even if they utilize
       * zero tracks.
       *
       * Note: a conversion having discarded tracks does not automatically mean it is invalid; if the remaining, utilized
       * tracks make for a valid output file, the conversion is still allowed.
       */
      this.isValid = false;
      /**
       * The list of tracks that are included in the output file. When fan-out is used, the same track appears in this
       * array multiple times.
       */
      this.utilizedTracks = [];
      /** The list of tracks from the input file that have been discarded, alongside the discard reason. */
      this.discardedTracks = [];
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (!(options.input instanceof Input)) {
        throw new TypeError("options.input must be an Input.");
      }
      if (!(options.output instanceof Output)) {
        throw new TypeError("options.output must be an Output.");
      }
      if (options.tracks !== void 0 && options.tracks !== "all" && options.tracks !== "primary") {
        throw new TypeError(
          "options.tracks, when provided, must be either 'all' or 'primary'."
        );
      }
      if (options.composable !== void 0 && typeof options.composable !== "boolean") {
        throw new TypeError("options.composable, when provided, must be a boolean.");
      }
      const composable = options.composable ?? false;
      if (!composable) {
        if (options.output.tracks.length > 0 || Object.keys(options.output._metadataTags).length > 0 || options.output.state !== "pending") {
          throw new TypeError("options.output must be fresh: no tracks or metadata tags added and not started.");
        }
      } else {
        if (options.tags !== void 0) {
          throw new TypeError(
            "options.tags cannot be set by a composable conversion; set metadata directly on the output instead."
          );
        }
        if (options.output.state !== "pending") {
          throw new TypeError("options.output must not have been started yet.");
        }
      }
      if (options.video !== void 0 && typeof options.video !== "function") {
        if (Array.isArray(options.video)) {
          for (const obj of options.video) {
            validateVideoOptions(obj);
          }
        } else {
          validateVideoOptions(options.video);
        }
      } else {
      }
      if (options.audio !== void 0 && typeof options.audio !== "function") {
        if (Array.isArray(options.audio)) {
          for (const obj of options.audio) {
            validateAudioOptions(obj);
          }
        } else {
          validateAudioOptions(options.audio);
        }
      } else {
      }
      if (options.trim !== void 0 && (!options.trim || typeof options.trim !== "object")) {
        throw new TypeError("options.trim, when provided, must be an object.");
      }
      if (options.trim?.start !== void 0 && !Number.isFinite(options.trim.start)) {
        throw new TypeError("options.trim.start, when provided, must be a finite number.");
      }
      if (options.trim?.end !== void 0 && !Number.isFinite(options.trim.end)) {
        throw new TypeError("options.trim.end, when provided, must be a finite number.");
      }
      if (options.trim?.start !== void 0 && options.trim.end !== void 0 && options.trim.start >= options.trim.end) {
        throw new TypeError("options.trim.start must be less than options.trim.end.");
      }
      if (options.tags !== void 0 && (typeof options.tags !== "object" || !options.tags) && typeof options.tags !== "function") {
        throw new TypeError("options.tags, when provided, must be an object or a function.");
      }
      if (typeof options.tags === "object") {
        validateMetadataTags(options.tags);
      }
      if (options.showWarnings !== void 0 && typeof options.showWarnings !== "boolean") {
        throw new TypeError("options.showWarnings, when provided, must be a boolean.");
      }
      this._options = options;
      this._composable = composable;
      this.input = options.input;
      this.output = options.output;
    }
    /** Initializes a new conversion process without starting the conversion. */
    static async init(options) {
      const conversion = new _Conversion(options);
      await conversion._init();
      return conversion;
    }
    /** @internal */
    async _init() {
      const inputFormat = await this.input.getFormat();
      let tracks;
      let trackMode = this._options.tracks;
      if (trackMode === void 0) {
        const defaultTrackMode = inputFormat.name.includes("(HLS)") ? "primary" : "all";
        trackMode = defaultTrackMode;
      }
      if (trackMode === "all") {
        tracks = await this.input.getTracks();
      } else if (trackMode === "primary") {
        const primaryVideoTrack = await this.input.getPrimaryVideoTrack();
        const primaryAudioTrack = await this.input.getPrimaryAudioTrack();
        tracks = [primaryVideoTrack, primaryAudioTrack].filter((x) => x !== null);
      } else {
        assertNever(trackMode);
        assert(false);
      }
      const outputTrackCounts = this.output.format.getSupportedTrackCounts();
      let nVideo = 1;
      let nAudio = 1;
      const filteredTracks = [];
      const filteredTrackOptions = [];
      for (const track of tracks) {
        let trackOptions;
        if (track.isVideoTrack()) {
          if (this._options.video) {
            if (typeof this._options.video === "function") {
              const returnedTrackOptions = await this._options.video(track, nVideo) ?? {};
              if (Array.isArray(returnedTrackOptions)) {
                for (const obj of returnedTrackOptions) {
                  validateVideoOptions(obj);
                }
              } else {
                validateVideoOptions(returnedTrackOptions);
              }
              trackOptions = Array.isArray(returnedTrackOptions) ? returnedTrackOptions : [returnedTrackOptions];
              nVideo++;
            } else {
              trackOptions = Array.isArray(this._options.video) ? this._options.video : [this._options.video];
            }
          } else {
            trackOptions = [{}];
          }
        } else if (track.isAudioTrack()) {
          if (this._options.audio) {
            if (typeof this._options.audio === "function") {
              const returnedTrackOptions = await this._options.audio(track, nAudio) ?? {};
              if (Array.isArray(returnedTrackOptions)) {
                for (const obj of returnedTrackOptions) {
                  validateAudioOptions(obj);
                }
              } else {
                validateAudioOptions(returnedTrackOptions);
              }
              trackOptions = Array.isArray(returnedTrackOptions) ? returnedTrackOptions : [returnedTrackOptions];
              nAudio++;
            } else {
              trackOptions = Array.isArray(this._options.audio) ? this._options.audio : [this._options.audio];
            }
          } else {
            trackOptions = [{}];
          }
        } else {
          assert(false);
        }
        const discardOptions = trackOptions.filter((x) => x.discard);
        for (const discardOption of discardOptions) {
          this.discardedTracks.push({
            track,
            reason: "discarded_by_user",
            trackOptions: discardOption
          });
        }
        if (trackOptions.length === discardOptions.length) {
          if (trackOptions.length === 0) {
            this.discardedTracks.push({
              track,
              reason: "discarded_by_user",
              trackOptions: {}
            });
          }
          continue;
        }
        const nonDiscardOptions = trackOptions.filter((x) => !x.discard);
        filteredTracks.push(track);
        filteredTrackOptions.push(nonDiscardOptions);
      }
      if (this._options.trim?.start !== void 0) {
        this._startTimestamp = this._options.trim.start;
      } else {
        this._startTimestamp = Math.max(
          await this.input.getFirstTimestamp(filteredTracks),
          // Samples can also have negative timestamps, but the meaning typically is "don't present me", so let's
          // cut those out by default.
          0
        );
      }
      this._endTimestamp = Math.max(this._options.trim?.end ?? Infinity, this._startTimestamp);
      for (let i = 0; i < filteredTracks.length; i++) {
        const track = filteredTracks[i];
        const options = filteredTrackOptions[i];
        for (const option of options) {
          if (this.output.tracks.length === outputTrackCounts.total.max) {
            this.discardedTracks.push({
              track,
              reason: "max_track_count_reached",
              trackOptions: option
            });
            continue;
          }
          const addedCountOfType = this.output.tracks.reduce(
            (count, t) => count + (t.type === track.type ? 1 : 0),
            0
          );
          if (addedCountOfType === outputTrackCounts[track.type].max) {
            this.discardedTracks.push({
              track,
              reason: "max_track_count_of_type_reached",
              trackOptions: option
            });
            continue;
          }
          const outputTrackId = this._nextOutputTrackId++;
          if (track.isVideoTrack()) {
            await this._processVideoTrack(track, option, outputTrackId);
          } else if (track.isAudioTrack()) {
            await this._processAudioTrack(track, option, outputTrackId);
          } else {
            assert(false);
          }
        }
      }
      for (let i = 0; i < this.utilizedTracks.length - 1; i++) {
        for (let j = i + 1; j < this.utilizedTracks.length; j++) {
          const trackA = this.utilizedTracks[i];
          const trackB = this.utilizedTracks[j];
          const ownGroupA = this._outputOwnTrackGroups[i];
          const ownGroupB = this._outputOwnTrackGroups[j];
          assert(ownGroupA !== void 0);
          assert(ownGroupB !== void 0);
          if (ownGroupA && ownGroupB && trackA.canBePairedWith(trackB)) {
            ownGroupA.pairWith(ownGroupB);
          }
        }
      }
      if (!this._composable) {
        const inputTags = await this.input.getMetadataTags();
        let outputTags;
        if (this._options.tags) {
          const result = typeof this._options.tags === "function" ? await this._options.tags(inputTags) : this._options.tags;
          validateMetadataTags(result);
          outputTags = result;
        } else {
          outputTags = inputTags;
        }
        const inputAndOutputFormatMatch = inputFormat.mimeType === this.output.format.mimeType;
        const rawTagsAreUnchanged = inputTags.raw === outputTags.raw;
        if (inputTags.raw && rawTagsAreUnchanged && !inputAndOutputFormatMatch) {
          delete outputTags.raw;
        }
        this.output.setMetadataTags(outputTags);
      }
      if (!this._composable) {
        this.isValid = this.output.hasEnoughTracks() && this.output.tracks.length > 0;
      } else {
        this.isValid = true;
      }
      if (this._options.showWarnings ?? true) {
        const warnElements = [];
        const unintentionallyDiscardedTracks = this.discardedTracks.filter((x) => x.reason !== "discarded_by_user");
        if (unintentionallyDiscardedTracks.length > 0) {
          warnElements.push(
            "Some tracks had to be discarded from the conversion:",
            unintentionallyDiscardedTracks
          );
        }
        if (!this.isValid) {
          if (warnElements.length > 0) {
            warnElements.push("\n\n");
          }
          warnElements.push(this._getInvalidityExplanation().join(""));
        }
        if (warnElements.length > 0) {
          Logging._warn(...warnElements);
        }
      }
    }
    /** @internal */
    _getInvalidityExplanation() {
      const elements = [];
      if (this.discardedTracks.length === 0) {
        elements.push(
          "Due to missing tracks, this conversion cannot be executed."
        );
      } else {
        const encodabilityIsTheProblem = this.discardedTracks.every(
          (x) => x.reason === "discarded_by_user" || x.reason === "no_encodable_target_codec"
        ) && this.discardedTracks.some((x) => x.reason === "no_encodable_target_codec");
        elements.push(
          "Due to discarded tracks, this conversion cannot be executed."
        );
        if (encodabilityIsTheProblem) {
          const codecs = this.discardedTracks.flatMap((x) => {
            if (x.reason === "discarded_by_user") return [];
            let supportedCodecs;
            if (x.track.type === "video") {
              supportedCodecs = this.output.format.getSupportedVideoCodecs();
            } else if (x.track.type === "audio") {
              supportedCodecs = this.output.format.getSupportedAudioCodecs();
            } else {
              supportedCodecs = this.output.format.getSupportedSubtitleCodecs();
            }
            return supportedCodecs.filter((codec) => !x.trackOptions.codec || codec === x.trackOptions.codec);
          });
          const uniqueCodecs = [...new Set(codecs)];
          if (uniqueCodecs.length === 1) {
            elements.push(
              `
Tracks were discarded because your environment is not able to encode '${uniqueCodecs[0]}' with the provided parameters.`
            );
          } else {
            elements.push(
              `
Tracks were discarded because your environment is not able to encode any of the codecs ${uniqueCodecs.map((x) => `'${x}'`).join(", ")} with the provided parameters.`
            );
          }
          if (uniqueCodecs.includes("mp3")) {
            elements.push(
              `
The @mediabunny/mp3-encoder extension package provides support for encoding MP3.`
            );
          }
          if (uniqueCodecs.includes("aac")) {
            elements.push(
              "\nThe @mediabunny/aac-encoder extension package provides support for encoding AAC."
            );
          }
          if (uniqueCodecs.includes("ac3") || uniqueCodecs.includes("eac3")) {
            elements.push(
              "\nThe @mediabunny/ac3 extension package provides support for encoding and decoding AC-3/E-AC-3."
            );
          }
          if (uniqueCodecs.includes("flac")) {
            elements.push(
              "\nThe @mediabunny/flac-encoder extension package provides support for encoding FLAC."
            );
          }
        } else {
          elements.push("\nCheck the discardedTracks field for more info.");
        }
      }
      return elements;
    }
    /**
     * Executes the conversion process and resolves when the conversion is complete. When
     * {@link ConversionExecuteOptions.until} is provided, the conversion will be suspended once that output timestamp
     * is reached and can be resumed with another call to `execute`. An ongoing execution may also be suspended via
     * {@link ConversionExecuteOptions.pauseSignal}.
     *
     * Execution will throw if `isValid` is `false`.
     */
    async execute(options = {}) {
      if (!options || typeof options !== "object") {
        throw new TypeError("options must be an object.");
      }
      if (options.until !== void 0 && (typeof options.until !== "number" || Number.isNaN(options.until))) {
        throw new TypeError("options.until, when provided, must be a number.");
      }
      if (options.pauseSignal !== void 0 && !(options.pauseSignal instanceof AbortSignal)) {
        throw new TypeError("options.pauseSignal, when provided, must be an AbortSignal.");
      }
      if (!this.isValid) {
        throw new Error(
          "Cannot execute this conversion because its output configuration is invalid. Make sure to always check the isValid field before executing a conversion.\n" + this._getInvalidityExplanation().join("")
        );
      }
      if (this.state === "executing") {
        throw new Error("Cannot call execute() while a previous call to execute() is still running.");
      }
      if (this.state === "canceled") {
        throw new ConversionCanceledError();
      }
      if (this.state === "done") {
        return;
      }
      if (this._composable && this.output.state === "pending") {
        throw new Error(
          "A composable conversion requires the output to be started. Call start() on the output before executing the conversion."
        );
      }
      this.state = "executing";
      this._executionUntil = options.until ?? Infinity;
      this._pauseRequested = options.pauseSignal?.aborted ?? false;
      const onPause = () => {
        if (this.state !== "executing") {
          return;
        }
        this._pauseRequested = true;
        this._synchronizer.resolveAll();
      };
      options.pauseSignal?.addEventListener("abort", onPause);
      for (const pump of this._trackPumps) {
        if (!pump.done) {
          pump.resolvers = promiseWithResolvers();
        }
      }
      if (!this._executed) {
        this._executed = true;
        for (const id of this._outputTrackIds) {
          this._synchronizer.declareTrack(id);
        }
        if (this.onProgress) {
          const uniqueUtilizedTracks = new Set(this.utilizedTracks);
          const durationPromises = [...uniqueUtilizedTracks].map(async (track) => {
            if (await track.isLive()) {
              return Infinity;
            }
            return await track.getDurationFromMetadata() ?? await track.computeDuration();
          });
          const duration = Math.max(0, ...await Promise.all(durationPromises));
          this._computeProgress = true;
          this._totalDuration = Math.min(
            duration - this._startTimestamp,
            this._endTimestamp - this._startTimestamp
          );
          for (const id of this._outputTrackIds) {
            this._maxTimestamps.set(id, 0);
          }
          this.onProgress?.(0, 0);
        }
        if (!this._composable) {
          await this.output.start();
        }
        for (const pump of this._trackPumps) {
          pump.start();
        }
      } else {
        for (const pump of this._trackPumps) {
          pump.wake?.();
        }
      }
      try {
        await Promise.all(this._trackPumps.map((x) => x.resolvers.promise));
      } catch (error) {
        if (this.state !== "canceled") {
          void this.cancel();
        }
        throw error;
      } finally {
        options.pauseSignal?.removeEventListener("abort", onPause);
      }
      if (this.state === "canceled") {
        throw new ConversionCanceledError();
      }
      const isDone = this._trackPumps.every((x) => x.done);
      this.state = isDone ? "done" : "idle";
      if (isDone) {
        if (!this._composable) {
          await this.output.finalize();
        }
        if (this._computeProgress) {
          const minTimestamp = Math.min(...this._maxTimestamps.values());
          this.onProgress?.(1, minTimestamp);
        }
      }
    }
    /**
     * Cancels the conversion process, causing any ongoing `execute` call to throw a `ConversionCanceledError`.
     * Does nothing if the conversion is already complete.
     */
    async cancel() {
      if (this.state === "done") {
        return;
      }
      if (this.state === "canceled") {
        Logging._warn("Conversion already canceled.");
        return;
      }
      this.state = "canceled";
      for (const pump of this._trackPumps) {
        pump.wake?.();
      }
      this._synchronizer.resolveAll();
      if (!this._composable) {
        await this.output.cancel();
      }
    }
    /** @internal */
    async _processVideoTrack(track, trackOptions, outputTrackId) {
      const sourceCodec = await track.getCodec();
      if (!sourceCodec) {
        this.discardedTracks.push({
          track,
          reason: "unknown_source_codec",
          trackOptions
        });
        return;
      }
      let videoSource;
      const innateRotation = await track.getRotation();
      const totalRotation = normalizeRotation(innateRotation + (trackOptions.rotate ?? 0));
      let outputTrackRotation = totalRotation;
      const canUseRotationMetadata = this.output.format.supportsVideoRotationMetadata && (trackOptions.allowRotationMetadata ?? true);
      const squarePixelWidth = await track.getSquarePixelWidth();
      const squarePixelHeight = await track.getSquarePixelHeight();
      const [rotatedWidth, rotatedHeight] = totalRotation % 180 === 0 ? [squarePixelWidth, squarePixelHeight] : [squarePixelHeight, squarePixelWidth];
      let crop = trackOptions.crop;
      if (crop) {
        crop = clampCropRectangle(crop, rotatedWidth, rotatedHeight);
      }
      const [originalWidth, originalHeight] = crop ? [crop.width, crop.height] : [rotatedWidth, rotatedHeight];
      let width = originalWidth;
      let height = originalHeight;
      const aspectRatio = width / height;
      if (trackOptions.width !== void 0 && trackOptions.height === void 0) {
        width = ceilToMultipleOfTwo(trackOptions.width);
        height = ceilToMultipleOfTwo(Math.round(width / aspectRatio));
      } else if (trackOptions.width === void 0 && trackOptions.height !== void 0) {
        height = ceilToMultipleOfTwo(trackOptions.height);
        width = ceilToMultipleOfTwo(Math.round(height * aspectRatio));
      } else if (trackOptions.width !== void 0 && trackOptions.height !== void 0) {
        width = ceilToMultipleOfTwo(trackOptions.width);
        height = ceilToMultipleOfTwo(trackOptions.height);
      }
      const firstTimestamp = await track.getFirstTimestamp();
      let videoCodecs = this.output.format.getSupportedVideoCodecs();
      const needsTranscode = !!trackOptions.forceTranscode || firstTimestamp < this._startTimestamp || !!trackOptions.frameRate || trackOptions.keyFrameInterval !== void 0 || trackOptions.process !== void 0 || trackOptions.quality !== void 0 || trackOptions.bitrate !== void 0 || !videoCodecs.includes(sourceCodec) || trackOptions.codec && trackOptions.codec !== sourceCodec || width !== originalWidth || height !== originalHeight || totalRotation !== 0 && !canUseRotationMetadata || !!crop;
      const alpha = trackOptions.alpha ?? "discard";
      if (!needsTranscode) {
        const source = new EncodedVideoPacketSource(sourceCodec);
        videoSource = source;
        this._registerTrackPump(async (pump) => {
          const sink = new EncodedPacketSink(track);
          const decoderConfig = await track.getDecoderConfig();
          const meta = { decoderConfig: decoderConfig ?? void 0 };
          for await (const packet of sink.packets(void 0, void 0, { verifyKeyPackets: true })) {
            if (this.state === "canceled") {
              break;
            }
            if (packet.timestamp >= this._endTimestamp) {
              break;
            }
            const modifiedPacket = packet.clone({
              timestamp: packet.timestamp - this._startTimestamp,
              sideData: alpha === "discard" ? {} : packet.sideData
            });
            assert(modifiedPacket.timestamp >= 0);
            this._reportProgress(outputTrackId, modifiedPacket.timestamp + modifiedPacket.duration);
            await source.add(modifiedPacket, meta);
            if (this._synchronizer.shouldWait(outputTrackId, modifiedPacket.timestamp)) {
              await this._synchronizer.wait(modifiedPacket.timestamp);
            }
            await this._checkpoint(pump, modifiedPacket.timestamp);
          }
          source.close();
          this._synchronizer.closeTrack(outputTrackId);
        });
      } else {
        const canDecode2 = await track.canDecode();
        if (!canDecode2) {
          this.discardedTracks.push({
            track,
            reason: "undecodable_source_codec",
            trackOptions
          });
          return;
        }
        if (trackOptions.codec) {
          videoCodecs = videoCodecs.filter((codec) => codec === trackOptions.codec);
        }
        const quality = resolveQuality(trackOptions.quality, trackOptions.bitrate) ?? new Quality("high");
        const encodableCodec = await getFirstEncodableVideoCodec(videoCodecs, {
          width: trackOptions.process && trackOptions.processedWidth ? trackOptions.processedWidth : width,
          height: trackOptions.process && trackOptions.processedHeight ? trackOptions.processedHeight : height,
          quality
        });
        if (!encodableCodec) {
          this.discardedTracks.push({
            track,
            reason: "no_encodable_target_codec",
            trackOptions
          });
          return;
        }
        const encodingConfig = {
          codec: encodableCodec,
          quality,
          keyFrameInterval: trackOptions.keyFrameInterval,
          sizeChangeBehavior: trackOptions.fit ?? "passThrough",
          alpha,
          hardwareAcceleration: trackOptions.hardwareAcceleration,
          transform: {}
        };
        assert(encodingConfig.transform);
        let needsRerender = width !== originalWidth || height !== originalHeight || totalRotation !== 0 && (!canUseRotationMetadata || trackOptions.process !== void 0) || !!crop || squarePixelWidth !== await track.getCodedWidth() || squarePixelHeight !== await track.getCodedHeight();
        if (!needsRerender) {
          var _stack = [];
          try {
            const tempOutput = new Output({
              format: new Mp4OutputFormat(),
              // Supports all video codecs
              target: new NullTarget()
            });
            const tempSource = new VideoSampleSource(encodingConfig);
            tempOutput.addVideoTrack(tempSource);
            await tempOutput.start();
            const sink = new VideoSampleSink(track);
            const firstSample = __using(_stack, await sink.getSample(firstTimestamp));
            if (firstSample) {
              try {
                await tempSource.add(firstSample);
                firstSample.close();
                await tempOutput.finalize();
              } catch (error) {
                Logging._warn(
                  "An error occurred when probing encoder support. Falling back to rerender path.",
                  error
                );
                void tempOutput.cancel();
                needsRerender = true;
                encodingConfig.transform.force = true;
              }
            } else {
              await tempOutput.cancel();
            }
          } catch (_) {
            var _error = _, _hasError = true;
          } finally {
            __callDispose(_stack, _error, _hasError);
          }
        }
        if (trackOptions.frameRate) {
          encodingConfig.transform.frameRate = trackOptions.frameRate;
        }
        if (trackOptions.process) {
          encodingConfig.transform.process = trackOptions.process;
        }
        if (needsRerender) {
          outputTrackRotation = 0;
          encodingConfig.transform.width = width;
          encodingConfig.transform.height = height;
          encodingConfig.transform.fit = trackOptions.fit ?? "fill";
          encodingConfig.transform.rotate = normalizeRotation(totalRotation - innateRotation);
          encodingConfig.transform.crop = crop;
          encodingConfig.transform.alpha = alpha;
        }
        let lastSampleTimestamp = null;
        encodingConfig.onEncodedSample = (sample) => {
          lastSampleTimestamp = sample.timestamp;
        };
        const source = new VideoSampleSource(encodingConfig);
        videoSource = source;
        this._registerTrackPump(async (pump) => {
          const sink = new VideoSampleSink(track);
          for await (var _sample of sink.samples(this._startTimestamp, this._endTimestamp)) {
            var _stack2 = [];
            try {
              const sample = __using(_stack2, _sample);
              if (this.state === "canceled") {
                break;
              }
              const adjustedSampleTimestamp = Math.max(sample.timestamp - this._startTimestamp, 0);
              sample.setTimestamp(adjustedSampleTimestamp);
              this._reportProgress(outputTrackId, sample.timestamp + sample.duration);
              await source.add(sample);
              sample.close();
              if (lastSampleTimestamp !== null) {
                if (this._synchronizer.shouldWait(outputTrackId, lastSampleTimestamp)) {
                  await this._synchronizer.wait(lastSampleTimestamp);
                }
                await this._checkpoint(pump, lastSampleTimestamp);
              }
            } catch (_2) {
              var _error2 = _2, _hasError2 = true;
            } finally {
              __callDispose(_stack2, _error2, _hasError2);
            }
          }
          source.close();
          this._synchronizer.closeTrack(outputTrackId);
        });
      }
      let ownGroup = null;
      if (!trackOptions.group && !this._composable) {
        ownGroup = new OutputTrackGroup();
      }
      const videoTrackLanguageCode = await track.getLanguageCode();
      this.output.addVideoTrack(videoSource, {
        frameRate: trackOptions.frameRate,
        // TODO: This condition can be removed when all demuxers properly homogenize to BCP47 in v2
        languageCode: isIso639Dash2LanguageCode(videoTrackLanguageCode) ? videoTrackLanguageCode : void 0,
        name: await track.getName() ?? void 0,
        disposition: await track.getDisposition(),
        rotation: outputTrackRotation,
        group: ownGroup ?? trackOptions.group
      });
      this.utilizedTracks.push(track);
      this._outputTrackIds.push(outputTrackId);
      this._outputOwnTrackGroups.push(ownGroup);
    }
    /** @internal */
    async _processAudioTrack(track, trackOptions, outputTrackId) {
      const sourceCodec = await track.getCodec();
      if (!sourceCodec) {
        this.discardedTracks.push({
          track,
          reason: "unknown_source_codec",
          trackOptions
        });
        return;
      }
      let audioSource;
      const originalNumberOfChannels = await track.getNumberOfChannels();
      const originalSampleRate = await track.getSampleRate();
      const firstTimestamp = await track.getFirstTimestamp();
      let numberOfChannels = trackOptions.numberOfChannels ?? originalNumberOfChannels;
      let sampleRate = trackOptions.sampleRate ?? originalSampleRate;
      const needsTrimming = firstTimestamp < this._startTimestamp;
      let needsPadding = firstTimestamp > this._startTimestamp && !this.output.format.supportsTimestampedMediaData;
      let audioCodecs = this.output.format.getSupportedAudioCodecs();
      if (!trackOptions.forceTranscode && !trackOptions.quality && !trackOptions.bitrate && numberOfChannels === originalNumberOfChannels && sampleRate === originalSampleRate && !needsTrimming && !needsPadding && audioCodecs.includes(sourceCodec) && (!trackOptions.codec || trackOptions.codec === sourceCodec) && !trackOptions.process && trackOptions.sampleFormat === void 0) {
        const source = new EncodedAudioPacketSource(sourceCodec);
        audioSource = source;
        this._registerTrackPump(async (pump) => {
          const sink = new EncodedPacketSink(track);
          const decoderConfig = await track.getDecoderConfig();
          const meta = { decoderConfig: decoderConfig ?? void 0 };
          for await (const packet of sink.packets()) {
            if (this.state === "canceled") {
              break;
            }
            if (packet.timestamp >= this._endTimestamp) {
              break;
            }
            const modifiedPacket = packet.clone({
              timestamp: packet.timestamp - this._startTimestamp
            });
            assert(modifiedPacket.timestamp >= 0);
            this._reportProgress(outputTrackId, modifiedPacket.timestamp + modifiedPacket.duration);
            await source.add(modifiedPacket, meta);
            if (this._synchronizer.shouldWait(outputTrackId, modifiedPacket.timestamp)) {
              await this._synchronizer.wait(modifiedPacket.timestamp);
            }
            await this._checkpoint(pump, modifiedPacket.timestamp);
          }
          source.close();
          this._synchronizer.closeTrack(outputTrackId);
        });
      } else {
        const canDecode2 = await track.canDecode();
        if (!canDecode2) {
          this.discardedTracks.push({
            track,
            reason: "undecodable_source_codec",
            trackOptions
          });
          return;
        }
        let codecOfChoice = null;
        if (trackOptions.codec) {
          audioCodecs = audioCodecs.filter((codec) => codec === trackOptions.codec);
        }
        const quality = resolveQuality(trackOptions.quality, trackOptions.bitrate) ?? new Quality("high");
        const encodableCodecs = await getEncodableAudioCodecs(audioCodecs, {
          numberOfChannels: trackOptions.process && trackOptions.processedNumberOfChannels ? trackOptions.processedNumberOfChannels : numberOfChannels,
          sampleRate: trackOptions.process && trackOptions.processedSampleRate ? trackOptions.processedSampleRate : sampleRate,
          quality
        });
        if (!encodableCodecs.some((codec) => NON_PCM_AUDIO_CODECS.includes(codec)) && audioCodecs.some((codec) => NON_PCM_AUDIO_CODECS.includes(codec)) && (numberOfChannels !== FALLBACK_NUMBER_OF_CHANNELS || sampleRate !== FALLBACK_SAMPLE_RATE)) {
          const encodableCodecsWithDefaultParams = await getEncodableAudioCodecs(audioCodecs, {
            numberOfChannels: FALLBACK_NUMBER_OF_CHANNELS,
            sampleRate: FALLBACK_SAMPLE_RATE,
            quality
          });
          const nonPcmCodec = encodableCodecsWithDefaultParams.find((codec) => NON_PCM_AUDIO_CODECS.includes(codec));
          if (nonPcmCodec) {
            codecOfChoice = nonPcmCodec;
            numberOfChannels = FALLBACK_NUMBER_OF_CHANNELS;
            sampleRate = FALLBACK_SAMPLE_RATE;
          }
        } else {
          codecOfChoice = encodableCodecs[0] ?? null;
        }
        if (codecOfChoice === null) {
          this.discardedTracks.push({
            track,
            reason: "no_encodable_target_codec",
            trackOptions
          });
          return;
        }
        const encodingConfig = {
          codec: codecOfChoice,
          quality,
          transform: {
            sampleFormat: trackOptions.sampleFormat,
            process: trackOptions.process
          }
        };
        assert(encodingConfig.transform);
        if (numberOfChannels !== originalNumberOfChannels) {
          encodingConfig.transform.numberOfChannels = numberOfChannels;
        }
        if (sampleRate !== originalSampleRate) {
          encodingConfig.transform.sampleRate = sampleRate;
        }
        let lastSampleTimestamp = null;
        encodingConfig.onEncodedSample = (sample) => {
          lastSampleTimestamp = sample.timestamp;
        };
        const source = new AudioSampleSource(encodingConfig);
        audioSource = source;
        this._registerTrackPump(async (pump) => {
          const sink = new AudioSampleSink(track);
          for await (var _sample of sink.samples(this._startTimestamp, this._endTimestamp)) {
            var _stack3 = [];
            try {
              const sample = __using(_stack3, _sample);
              var _stack2 = [];
              try {
                if (this.state === "canceled") {
                  break;
                }
                if (needsPadding) {
                  var _stack = [];
                  try {
                    const paddingLength = firstTimestamp - this._startTimestamp;
                    const paddingLengthSamples = Math.round(paddingLength * originalSampleRate);
                    const bytesPerSample = getBytesPerSample(sample.format);
                    const data = new Uint8Array(bytesPerSample * paddingLengthSamples * originalNumberOfChannels);
                    if (sample.format === "u8" || sample.format === "u8-planar") {
                      data.fill(2 ** 7);
                    }
                    const silentSample = __using(_stack, new AudioSample({
                      data,
                      // Use the same format the decoder is spitting out. This avoids feeding changing sample
                      // formats to the audio encoder.
                      format: sample.format,
                      numberOfChannels: originalNumberOfChannels,
                      sampleRate: originalSampleRate,
                      timestamp: 0
                    }));
                    await this._registerAudioSample(
                      pump,
                      silentSample,
                      source,
                      outputTrackId,
                      () => lastSampleTimestamp
                    );
                    needsPadding = false;
                  } catch (_) {
                    var _error = _, _hasError = true;
                  } finally {
                    __callDispose(_stack, _error, _hasError);
                  }
                }
                let startFrame = 0;
                let endFrame = sample.numberOfFrames;
                if (sample.timestamp < this._startTimestamp) {
                  startFrame = Math.round((this._startTimestamp - sample.timestamp) * sample.sampleRate);
                }
                if (sample.timestamp + sample.duration > this._endTimestamp) {
                  endFrame = Math.round((this._endTimestamp - sample.timestamp) * sample.sampleRate);
                }
                let finalSampleLet;
                if (startFrame > 0 || endFrame < sample.numberOfFrames) {
                  const trimmedSample = sample.trim(startFrame, endFrame);
                  sample.close();
                  finalSampleLet = trimmedSample;
                  if (trimmedSample.numberOfFrames === 0) {
                    trimmedSample.close();
                    continue;
                  }
                } else {
                  finalSampleLet = sample;
                }
                const finalSample = __using(_stack2, finalSampleLet);
                finalSample.setTimestamp(finalSample.timestamp - this._startTimestamp);
                await this._registerAudioSample(
                  pump,
                  finalSample,
                  source,
                  outputTrackId,
                  () => lastSampleTimestamp
                );
              } catch (_2) {
                var _error2 = _2, _hasError2 = true;
              } finally {
                __callDispose(_stack2, _error2, _hasError2);
              }
            } catch (_3) {
              var _error3 = _3, _hasError3 = true;
            } finally {
              __callDispose(_stack3, _error3, _hasError3);
            }
          }
          source.close();
          this._synchronizer.closeTrack(outputTrackId);
        });
      }
      let ownGroup = null;
      if (!trackOptions.group && !this._composable) {
        ownGroup = new OutputTrackGroup();
      }
      const audioTrackLanguageCode = await track.getLanguageCode();
      this.output.addAudioTrack(audioSource, {
        // TODO: This condition can be removed when all demuxers properly homogenize to BCP47 in v2
        languageCode: isIso639Dash2LanguageCode(audioTrackLanguageCode) ? audioTrackLanguageCode : void 0,
        name: await track.getName() ?? void 0,
        disposition: await track.getDisposition(),
        group: ownGroup ?? trackOptions.group
      });
      this.utilizedTracks.push(track);
      this._outputTrackIds.push(outputTrackId);
      this._outputOwnTrackGroups.push(ownGroup);
    }
    /** @internal */
    async _registerAudioSample(pump, sample, source, outputTrackId, getLastSampleTimestamp) {
      this._reportProgress(outputTrackId, sample.timestamp + sample.duration);
      await source.add(sample);
      sample.close();
      const lastSampleTimestamp = getLastSampleTimestamp();
      if (lastSampleTimestamp !== null) {
        if (this._synchronizer.shouldWait(outputTrackId, lastSampleTimestamp)) {
          await this._synchronizer.wait(lastSampleTimestamp);
        }
        await this._checkpoint(pump, lastSampleTimestamp);
      }
    }
    /** @internal */
    _registerTrackPump(fn) {
      const pump = {
        done: false,
        resolvers: promiseWithResolvers(),
        wake: null,
        start: () => {
          void fn(pump).then(() => {
            pump.done = true;
            pump.resolvers.resolve();
          }, (error) => {
            pump.resolvers.reject(error);
          });
        }
      };
      this._trackPumps.push(pump);
    }
    /** @internal */
    async _checkpoint(pump, timestamp) {
      while (this.state !== "canceled" && (timestamp >= this._executionUntil || this._pauseRequested)) {
        pump.resolvers.resolve();
        const { promise, resolve } = promiseWithResolvers();
        pump.wake = resolve;
        await promise;
      }
    }
    /** @internal */
    _reportProgress(trackId, endTimestamp) {
      if (!this._computeProgress) {
        return;
      }
      assert(this._totalDuration !== null);
      this._maxTimestamps.set(
        trackId,
        Math.max(endTimestamp, this._maxTimestamps.get(trackId))
      );
      const minTimestamp = Math.min(...this._maxTimestamps.values());
      const newProgress = clamp(minTimestamp / this._totalDuration, 0, 1);
      if (newProgress !== this._lastProgress) {
        this._lastProgress = newProgress;
        this.onProgress?.(newProgress, minTimestamp);
      }
    }
  };
  var ConversionCanceledError = class extends Error {
    /** Creates a new {@link ConversionCanceledError}. */
    constructor(message = "Conversion has been canceled.") {
      super(message);
      this.name = "ConversionCanceledError";
    }
  };
  var MAX_TIMESTAMP_GAP = 1;
  var TrackSynchronizer = class {
    constructor(conversion) {
      this.maxTimestamps = /* @__PURE__ */ new Map();
      // Track ID -> timestamp
      this.resolvers = [];
      this.conversion = conversion;
    }
    declareTrack(trackId) {
      this.maxTimestamps.set(trackId, 0);
    }
    shouldWait(trackId, timestamp) {
      const currentValue = this.maxTimestamps.get(trackId);
      assert(currentValue !== void 0);
      this.maxTimestamps.set(trackId, Math.max(timestamp, currentValue));
      const newMin = this.computeMinAndMaybeResolve();
      if (this.conversion.state === "canceled" || this.conversion._pauseRequested || timestamp >= this.conversion._executionUntil) {
        return false;
      }
      return timestamp - newMin > MAX_TIMESTAMP_GAP;
    }
    wait(timestamp) {
      const { promise, resolve } = promiseWithResolvers();
      this.resolvers.push({
        timestamp,
        resolve
      });
      return promise;
    }
    closeTrack(trackId) {
      this.maxTimestamps.delete(trackId);
      this.computeMinAndMaybeResolve();
    }
    resolveAll() {
      for (const entry of this.resolvers) {
        entry.resolve();
      }
      this.resolvers.length = 0;
    }
    computeMinAndMaybeResolve() {
      let newMin = Infinity;
      for (const [, timestamp] of this.maxTimestamps) {
        newMin = Math.min(newMin, timestamp);
      }
      for (let i = 0; i < this.resolvers.length; i++) {
        const entry = this.resolvers[i];
        if (entry.timestamp - newMin < MAX_TIMESTAMP_GAP) {
          entry.resolve();
          this.resolvers.splice(i, 1);
          i--;
        }
      }
      return newMin;
    }
  };

  // src/index.ts
  var MEDIABUNNY_LOADED_SYMBOL = Symbol.for("mediabunny loaded");
  if (globalThis[MEDIABUNNY_LOADED_SYMBOL]) {
    Logging._error(
      "[WARNING]\nMediabunny was loaded twice. This will likely cause Mediabunny not to work correctly. Check if multiple dependencies are importing different versions of Mediabunny, or if something is being bundled incorrectly."
    );
  }
  globalThis[MEDIABUNNY_LOADED_SYMBOL] = true;
  return __toCommonJS(index_exports);
})();
if (typeof module === "object" && typeof module.exports === "object") Object.assign(module.exports, Mediabunny)