Java 类com.google.android.exoplayer.extractor.mp4.Track 实例源码

private SmoothStreamingChunkSource(ManifestFetcher<SmoothStreamingManifest> manifestFetcher,
    SmoothStreamingManifest initialManifest, int streamElementIndex, int[] trackIndices,
    DataSource dataSource, FormatEvaluator formatEvaluator, long liveEdgeLatencyMs) {
  this.manifestFetcher = manifestFetcher;
  this.streamElementIndex = streamElementIndex;
  this.currentManifest = initialManifest;
  this.dataSource = dataSource;
  this.formatEvaluator = formatEvaluator;
  this.liveEdgeLatencyUs = liveEdgeLatencyMs * 1000;

  StreamElement streamElement = getElement(initialManifest);
  trackInfo = new TrackInfo(streamElement.tracks[0].format.mimeType, initialManifest.durationUs);
  evaluation = new Evaluation();

  TrackEncryptionBox[] trackEncryptionBoxes = null;
  ProtectionElement protectionElement = initialManifest.protectionElement;
  if (protectionElement != null) {
    byte[] keyId = getKeyId(protectionElement.data);
    trackEncryptionBoxes = new TrackEncryptionBox[1];
    trackEncryptionBoxes[0] = new TrackEncryptionBox(true, INITIALIZATION_VECTOR_SIZE, keyId);
    DrmInitData.Mapped drmInitData = new DrmInitData.Mapped(MimeTypes.VIDEO_MP4);
    drmInitData.put(protectionElement.uuid, protectionElement.data);
    this.drmInitData = drmInitData;
  } else {
    drmInitData = null;
  }

  int trackCount = trackIndices != null ? trackIndices.length : streamElement.tracks.length;
  formats = new Format[trackCount];
  extractorWrappers = new SparseArray<>();
  mediaFormats = new SparseArray<>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < trackCount; i++) {
    int trackIndex = trackIndices != null ? trackIndices[i] : i;
    formats[i] = streamElement.tracks[trackIndex].format;
    maxWidth = Math.max(maxWidth, formats[i].width);
    maxHeight = Math.max(maxHeight, formats[i].height);

    MediaFormat mediaFormat = getMediaFormat(streamElement, trackIndex);
    int trackType = streamElement.type == StreamElement.TYPE_VIDEO ? Track.TYPE_VIDEO
        : Track.TYPE_AUDIO;
    FragmentedMp4Extractor extractor = new FragmentedMp4Extractor(
        FragmentedMp4Extractor.WORKAROUND_EVERY_VIDEO_FRAME_IS_SYNC_FRAME);
    extractor.setTrack(new Track(trackIndex, trackType, streamElement.timescale,
        initialManifest.durationUs, mediaFormat, trackEncryptionBoxes,
        trackType == Track.TYPE_VIDEO ? 4 : -1));
    extractorWrappers.put(trackIndex, new ChunkExtractorWrapper(extractor));
    mediaFormats.put(trackIndex, mediaFormat);
  }
  this.maxWidth = maxWidth;
  this.maxHeight = maxHeight;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

private SmoothStreamingChunkSource(ManifestFetcher<SmoothStreamingManifest> manifestFetcher,
    SmoothStreamingManifest initialManifest, int streamElementIndex, int[] trackIndices,
    DataSource dataSource, FormatEvaluator formatEvaluator, long liveEdgeLatencyMs) {
  this.manifestFetcher = manifestFetcher;
  this.streamElementIndex = streamElementIndex;
  this.currentManifest = initialManifest;
  this.dataSource = dataSource;
  this.formatEvaluator = formatEvaluator;
  this.liveEdgeLatencyUs = liveEdgeLatencyMs * 1000;

  StreamElement streamElement = getElement(initialManifest);
  trackInfo = new TrackInfo(streamElement.tracks[0].format.mimeType, initialManifest.durationUs);
  evaluation = new Evaluation();

  TrackEncryptionBox[] trackEncryptionBoxes = null;
  ProtectionElement protectionElement = initialManifest.protectionElement;
  if (protectionElement != null) {
    byte[] keyId = getKeyId(protectionElement.data);
    trackEncryptionBoxes = new TrackEncryptionBox[1];
    trackEncryptionBoxes[0] = new TrackEncryptionBox(true, INITIALIZATION_VECTOR_SIZE, keyId);
    DrmInitData.Mapped drmInitData = new DrmInitData.Mapped(MimeTypes.VIDEO_MP4);
    drmInitData.put(protectionElement.uuid, protectionElement.data);
    this.drmInitData = drmInitData;
  } else {
    drmInitData = null;
  }

  int trackCount = trackIndices != null ? trackIndices.length : streamElement.tracks.length;
  formats = new Format[trackCount];
  extractorWrappers = new SparseArray<>();
  mediaFormats = new SparseArray<>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < trackCount; i++) {
    int trackIndex = trackIndices != null ? trackIndices[i] : i;
    formats[i] = streamElement.tracks[trackIndex].format;
    maxWidth = Math.max(maxWidth, formats[i].width);
    maxHeight = Math.max(maxHeight, formats[i].height);

    MediaFormat mediaFormat = getMediaFormat(streamElement, trackIndex);
    int trackType = streamElement.type == StreamElement.TYPE_VIDEO ? Track.TYPE_VIDEO
        : Track.TYPE_AUDIO;
    FragmentedMp4Extractor extractor = new FragmentedMp4Extractor(
        FragmentedMp4Extractor.WORKAROUND_EVERY_VIDEO_FRAME_IS_SYNC_FRAME);
    extractor.setTrack(new Track(trackIndex, trackType, streamElement.timescale,
        initialManifest.durationUs, mediaFormat, trackEncryptionBoxes,
        trackType == Track.TYPE_VIDEO ? 4 : -1));
    extractorWrappers.put(trackIndex, new ChunkExtractorWrapper(extractor));
    mediaFormats.put(trackIndex, mediaFormat);
  }
  this.maxWidth = maxWidth;
  this.maxHeight = maxHeight;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}