Java 类com.google.android.exoplayer.chunk.Format.DecreasingBandwidthComparator 实例源码

项目：ExoPlayer-Demo 文件：SmoothStreamingChunkSource.java

@Override
public void adaptiveTrack(SmoothStreamingManifest manifest, int element, int[] trackIndices) {
  if (adaptiveFormatEvaluator == null) {
    // Do nothing.
    return;
  }
  MediaFormat maxHeightMediaFormat = null;
  StreamElement streamElement = manifest.streamElements[element];
  int maxWidth = -1;
  int maxHeight = -1;
  Format[] formats = new Format[trackIndices.length];
  for (int i = 0; i < formats.length; i++) {
    int manifestTrackIndex = trackIndices[i];
    formats[i] = streamElement.tracks[manifestTrackIndex].format;
    MediaFormat mediaFormat = initManifestTrack(manifest, element, manifestTrackIndex);
    if (maxHeightMediaFormat == null || mediaFormat.height > maxHeight) {
      maxHeightMediaFormat = mediaFormat;
    }
    maxWidth = Math.max(maxWidth, mediaFormat.width);
    maxHeight = Math.max(maxHeight, mediaFormat.height);
  }
  Arrays.sort(formats, new DecreasingBandwidthComparator());
  MediaFormat adaptiveMediaFormat = maxHeightMediaFormat.copyAsAdaptive(null);
  tracks.add(new ExposedTrack(adaptiveMediaFormat, element, formats, maxWidth, maxHeight));
}

项目：ExoPlayer-Demo 文件：DashChunkSource.java

@Override
public void adaptiveTrack(MediaPresentationDescription manifest, int periodIndex,
    int adaptationSetIndex, int[] representationIndices) {
  if (adaptiveFormatEvaluator == null) {
    Log.w(TAG, "Skipping adaptive track (missing format evaluator)");
    return;
  }
  AdaptationSet adaptationSet = manifest.getPeriod(periodIndex).adaptationSets.get(
      adaptationSetIndex);
  int maxWidth = 0;
  int maxHeight = 0;
  Format maxHeightRepresentationFormat = null;
  Format[] representationFormats = new Format[representationIndices.length];
  for (int i = 0; i < representationFormats.length; i++) {
    Format format = adaptationSet.representations.get(representationIndices[i]).format;
    if (maxHeightRepresentationFormat == null || format.height > maxHeight) {
      maxHeightRepresentationFormat = format;
    }
    maxWidth = Math.max(maxWidth, format.width);
    maxHeight = Math.max(maxHeight, format.height);
    representationFormats[i] = format;
  }
  Arrays.sort(representationFormats, new DecreasingBandwidthComparator());
  long trackDurationUs = live ? C.UNKNOWN_TIME_US : manifest.duration * 1000;
  String mediaMimeType = getMediaMimeType(maxHeightRepresentationFormat);
  if (mediaMimeType == null) {
    Log.w(TAG, "Skipped adaptive track (unknown media mime type)");
    return;
  }
  MediaFormat trackFormat = getTrackFormat(adaptationSet.type, maxHeightRepresentationFormat,
      mediaMimeType, trackDurationUs);
  if (trackFormat == null) {
    Log.w(TAG, "Skipped adaptive track (unknown media format)");
    return;
  }
  tracks.add(new ExposedTrack(trackFormat.copyAsAdaptive(null), adaptationSetIndex,
      representationFormats, maxWidth, maxHeight));
}

项目：android-exoplayer 文件：DashChunkSource.java

private DashChunkSource(ManifestFetcher<MediaPresentationDescription> manifestFetcher,
    MediaPresentationDescription initialManifest, int adaptationSetIndex,
    int[] representationIndices, DataSource dataSource, FormatEvaluator formatEvaluator,
    long liveEdgeLatencyUs) {
  this.manifestFetcher = manifestFetcher;
  this.currentManifest = initialManifest;
  this.adaptationSetIndex = adaptationSetIndex;
  this.representationIndices = representationIndices;
  this.dataSource = dataSource;
  this.evaluator = formatEvaluator;
  this.liveEdgeLatencyUs = liveEdgeLatencyUs;
  this.evaluation = new Evaluation();
  this.headerBuilder = new StringBuilder();

  psshInfo = getPsshInfo(currentManifest, adaptationSetIndex);
  Representation[] representations = getFilteredRepresentations(currentManifest,
      adaptationSetIndex, representationIndices);
  long periodDurationUs = (representations[0].periodDurationMs == TrackRenderer.UNKNOWN_TIME_US)
      ? TrackRenderer.UNKNOWN_TIME_US : representations[0].periodDurationMs * 1000;
  this.trackInfo = new TrackInfo(representations[0].format.mimeType, periodDurationUs);

  this.formats = new Format[representations.length];
  this.representationHolders = new HashMap<String, RepresentationHolder>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < representations.length; i++) {
    formats[i] = representations[i].format;
    maxWidth = Math.max(formats[i].width, maxWidth);
    maxHeight = Math.max(formats[i].height, maxHeight);
    Extractor extractor = mimeTypeIsWebm(formats[i].mimeType) ? new WebmExtractor()
        : new FragmentedMp4Extractor();
    representationHolders.put(formats[i].id,
        new RepresentationHolder(representations[i], extractor));
  }
  this.maxWidth = maxWidth;
  this.maxHeight = maxHeight;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：Exoplayer_VLC 文件：DashChunkSource.java

private DashChunkSource(ManifestFetcher<MediaPresentationDescription> manifestFetcher,
    MediaPresentationDescription initialManifest, int adaptationSetIndex,
    int[] representationIndices, DataSource dataSource, FormatEvaluator formatEvaluator,
    long liveEdgeLatencyUs) {
  this.manifestFetcher = manifestFetcher;
  this.currentManifest = initialManifest;
  this.adaptationSetIndex = adaptationSetIndex;
  this.representationIndices = representationIndices;
  this.dataSource = dataSource;
  this.evaluator = formatEvaluator;
  this.liveEdgeLatencyUs = liveEdgeLatencyUs;
  this.evaluation = new Evaluation();
  this.headerBuilder = new StringBuilder();

  psshInfo = getPsshInfo(currentManifest, adaptationSetIndex);
  Representation[] representations = getFilteredRepresentations(currentManifest,
      adaptationSetIndex, representationIndices);
  long periodDurationUs = (representations[0].periodDurationMs == TrackRenderer.UNKNOWN_TIME_US)
      ? TrackRenderer.UNKNOWN_TIME_US : representations[0].periodDurationMs * 1000;
  this.trackInfo = new TrackInfo(representations[0].format.mimeType, periodDurationUs);

  this.formats = new Format[representations.length];
  this.representationHolders = new HashMap<String, RepresentationHolder>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < representations.length; i++) {
    formats[i] = representations[i].format;
    maxWidth = Math.max(formats[i].width, maxWidth);
    maxHeight = Math.max(formats[i].height, maxHeight);
    Extractor extractor = mimeTypeIsWebm(formats[i].mimeType) ? new WebmExtractor()
        : new FragmentedMp4Extractor();
    representationHolders.put(formats[i].id,
        new RepresentationHolder(representations[i], extractor));
  }
  this.maxWidth = maxWidth;
  this.maxHeight = maxHeight;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：edx-app-android 文件：DashChunkSource.java

/**
 * @param dataSource A {@link DataSource} suitable for loading the media data.
 * @param evaluator Selects from the available formats.
 * @param representations The representations to be considered by the source.
 */
public DashChunkSource(DataSource dataSource, FormatEvaluator evaluator,
    Representation... representations) {
  this.dataSource = dataSource;
  this.evaluator = evaluator;
  this.formats = new Format[representations.length];
  this.extractors = new HashMap<String, Extractor>();
  this.segmentIndexes = new HashMap<String, DashSegmentIndex>();
  this.representations = new HashMap<String, Representation>();
  this.trackInfo = new TrackInfo(representations[0].format.mimeType,
      representations[0].periodDurationMs * 1000);
  this.evaluation = new Evaluation();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < representations.length; i++) {
    formats[i] = representations[i].format;
    maxWidth = Math.max(formats[i].width, maxWidth);
    maxHeight = Math.max(formats[i].height, maxHeight);
    Extractor extractor = formats[i].mimeType.startsWith(MimeTypes.VIDEO_WEBM)
        ? new WebmExtractor() : new FragmentedMp4Extractor();
    extractors.put(formats[i].id, extractor);
    this.representations.put(formats[i].id, representations[i]);
    DashSegmentIndex segmentIndex = representations[i].getIndex();
    if (segmentIndex != null) {
      segmentIndexes.put(formats[i].id, segmentIndex);
    }
  }
  this.maxWidth = maxWidth;
  this.maxHeight = maxHeight;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：miku 文件：DashChunkSource.java

DashChunkSource(ManifestFetcher<MediaPresentationDescription> manifestFetcher,
    MediaPresentationDescription initialManifest, int adaptationSetIndex,
    int[] representationIndices, DataSource dataSource, FormatEvaluator formatEvaluator,
    Clock systemClock, long liveEdgeLatencyUs, long elapsedRealtimeOffsetUs,
    boolean startAtLiveEdge, Handler eventHandler, EventListener eventListener) {
  this.manifestFetcher = manifestFetcher;
  this.currentManifest = initialManifest;
  this.adaptationSetIndex = adaptationSetIndex;
  this.representationIndices = representationIndices;
  this.dataSource = dataSource;
  this.formatEvaluator = formatEvaluator;
  this.systemClock = systemClock;
  this.liveEdgeLatencyUs = liveEdgeLatencyUs;
  this.elapsedRealtimeOffsetUs = elapsedRealtimeOffsetUs;
  this.startAtLiveEdge = startAtLiveEdge;
  this.eventHandler = eventHandler;
  this.eventListener = eventListener;
  this.evaluation = new Evaluation();
  this.headerBuilder = new StringBuilder();
  this.seekRangeValues = new long[2];

  drmInitData = getDrmInitData(currentManifest, adaptationSetIndex);
  Representation[] representations = getFilteredRepresentations(currentManifest,
      adaptationSetIndex, representationIndices);
  long periodDurationUs = (representations[0].periodDurationMs == TrackRenderer.UNKNOWN_TIME_US)
      ? TrackRenderer.UNKNOWN_TIME_US : representations[0].periodDurationMs * 1000;
  this.trackInfo = new TrackInfo(representations[0].format.mimeType, periodDurationUs);

  this.formats = new Format[representations.length];
  this.representationHolders = new HashMap<>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < representations.length; i++) {
    formats[i] = representations[i].format;
    maxWidth = Math.max(formats[i].width, maxWidth);
    maxHeight = Math.max(formats[i].height, maxHeight);
    Extractor extractor = mimeTypeIsWebm(formats[i].mimeType) ? new WebmExtractor()
        : new FragmentedMp4Extractor();
    representationHolders.put(formats[i].id,
        new RepresentationHolder(representations[i], new ChunkExtractorWrapper(extractor)));
  }
  this.maxWidth = maxWidth;
  this.maxHeight = maxHeight;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：miku 文件：SmoothStreamingChunkSource.java

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());
}

项目：android-exoplayer 文件：SmoothStreamingChunkSource.java

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].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);
    psshInfo = Collections.singletonMap(protectionElement.uuid, protectionElement.data);
  } else {
    psshInfo = null;
  }

  int trackCount = trackIndices != null ? trackIndices.length : streamElement.tracks.length;
  formats = new SmoothStreamingFormat[trackCount];
  extractors = new SparseArray<FragmentedMp4Extractor>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < trackCount; i++) {
    int trackIndex = trackIndices != null ? trackIndices[i] : i;
    TrackElement trackElement = streamElement.tracks[trackIndex];
    formats[i] = new SmoothStreamingFormat(String.valueOf(trackIndex), trackElement.mimeType,
        trackElement.maxWidth, trackElement.maxHeight, trackElement.numChannels,
        trackElement.sampleRate, trackElement.bitrate, trackIndex);
    maxWidth = Math.max(maxWidth, trackElement.maxWidth);
    maxHeight = Math.max(maxHeight, trackElement.maxHeight);

    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, mediaFormat,
        trackEncryptionBoxes));
    extractors.put(trackIndex, extractor);
  }
  this.maxHeight = maxHeight;
  this.maxWidth = maxWidth;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：Exoplayer_VLC 文件：SmoothStreamingChunkSource.java

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].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);
    psshInfo = Collections.singletonMap(protectionElement.uuid, protectionElement.data);
  } else {
    psshInfo = null;
  }

  int trackCount = trackIndices != null ? trackIndices.length : streamElement.tracks.length;
  formats = new SmoothStreamingFormat[trackCount];
  extractors = new SparseArray<FragmentedMp4Extractor>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < trackCount; i++) {
    int trackIndex = trackIndices != null ? trackIndices[i] : i;
    TrackElement trackElement = streamElement.tracks[trackIndex];
    formats[i] = new SmoothStreamingFormat(String.valueOf(trackIndex), trackElement.mimeType,
        trackElement.maxWidth, trackElement.maxHeight, trackElement.numChannels,
        trackElement.sampleRate, trackElement.bitrate, trackIndex);
    maxWidth = Math.max(maxWidth, trackElement.maxWidth);
    maxHeight = Math.max(maxHeight, trackElement.maxHeight);

    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));
    extractors.put(trackIndex, extractor);
  }
  this.maxHeight = maxHeight;
  this.maxWidth = maxWidth;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：edx-app-android 文件：SmoothStreamingChunkSource.java

/**
 * @param baseUrl The base URL for the streams.
 * @param manifest The manifest parsed from {@code baseUrl + "/Manifest"}.
 * @param streamElementIndex The index of the stream element in the manifest to be provided by
 *     the source.
 * @param trackIndices The indices of the tracks within the stream element to be considered by
 *     the source. May be null if all tracks within the element should be considered.
 * @param dataSource A {@link DataSource} suitable for loading the media data.
 * @param formatEvaluator Selects from the available formats.
 */
public SmoothStreamingChunkSource(String baseUrl, SmoothStreamingManifest manifest,
    int streamElementIndex, int[] trackIndices, DataSource dataSource,
    FormatEvaluator formatEvaluator) {
  this.baseUrl = baseUrl;
  this.streamElement = manifest.streamElements[streamElementIndex];
  this.trackInfo = new TrackInfo(streamElement.tracks[0].mimeType, manifest.getDurationUs());
  this.dataSource = dataSource;
  this.formatEvaluator = formatEvaluator;
  this.evaluation = new Evaluation();

  TrackEncryptionBox[] trackEncryptionBoxes = null;
  ProtectionElement protectionElement = manifest.protectionElement;
  if (protectionElement != null) {
    byte[] keyId = getKeyId(protectionElement.data);
    trackEncryptionBoxes = new TrackEncryptionBox[1];
    trackEncryptionBoxes[0] = new TrackEncryptionBox(true, INITIALIZATION_VECTOR_SIZE, keyId);
  }

  int trackCount = trackIndices != null ? trackIndices.length : streamElement.tracks.length;
  formats = new SmoothStreamingFormat[trackCount];
  extractors = new SparseArray<FragmentedMp4Extractor>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < trackCount; i++) {
    int trackIndex = trackIndices != null ? trackIndices[i] : i;
    TrackElement trackElement = streamElement.tracks[trackIndex];
    formats[i] = new SmoothStreamingFormat(String.valueOf(trackIndex), trackElement.mimeType,
        trackElement.maxWidth, trackElement.maxHeight, trackElement.numChannels,
        trackElement.sampleRate, trackElement.bitrate, trackIndex);
    maxWidth = Math.max(maxWidth, trackElement.maxWidth);
    maxHeight = Math.max(maxHeight, trackElement.maxHeight);

    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, mediaFormat,
        trackEncryptionBoxes));
    if (protectionElement != null) {
      extractor.putPsshInfo(protectionElement.uuid, protectionElement.data);
    }
    extractors.put(trackIndex, extractor);
  }
  this.maxHeight = maxHeight;
  this.maxWidth = maxWidth;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：ExoPlayer 文件：DashChunkSource.java

DashChunkSource(ManifestFetcher<MediaPresentationDescription> manifestFetcher,
    MediaPresentationDescription initialManifest, int adaptationSetIndex,
    int[] representationIndices, DataSource dataSource, FormatEvaluator formatEvaluator,
    Clock systemClock, long liveEdgeLatencyUs, long elapsedRealtimeOffsetUs,
    boolean startAtLiveEdge, Handler eventHandler, EventListener eventListener) {
  this.manifestFetcher = manifestFetcher;
  this.currentManifest = initialManifest;
  this.adaptationSetIndex = adaptationSetIndex;
  this.representationIndices = representationIndices;
  this.dataSource = dataSource;
  this.formatEvaluator = formatEvaluator;
  this.systemClock = systemClock;
  this.liveEdgeLatencyUs = liveEdgeLatencyUs;
  this.elapsedRealtimeOffsetUs = elapsedRealtimeOffsetUs;
  this.startAtLiveEdge = startAtLiveEdge;
  this.eventHandler = eventHandler;
  this.eventListener = eventListener;
  this.evaluation = new Evaluation();
  this.headerBuilder = new StringBuilder();
  this.seekRangeValues = new long[2];

  drmInitData = getDrmInitData(currentManifest, adaptationSetIndex);
  Representation[] representations = getFilteredRepresentations(currentManifest,
      adaptationSetIndex, representationIndices);
  long periodDurationUs = (representations[0].periodDurationMs == TrackRenderer.UNKNOWN_TIME_US)
      ? TrackRenderer.UNKNOWN_TIME_US : representations[0].periodDurationMs * 1000;
  this.trackInfo = new TrackInfo(representations[0].format.mimeType, periodDurationUs);

  this.formats = new Format[representations.length];
  this.representationHolders = new HashMap<>();
  int maxWidth = 0;
  int maxHeight = 0;
  for (int i = 0; i < representations.length; i++) {
    formats[i] = representations[i].format;
    maxWidth = Math.max(formats[i].width, maxWidth);
    maxHeight = Math.max(formats[i].height, maxHeight);
    Extractor extractor = mimeTypeIsWebm(formats[i].mimeType) ? new WebmExtractor()
        : new FragmentedMp4Extractor();
    representationHolders.put(formats[i].id,
        new RepresentationHolder(representations[i], new ChunkExtractorWrapper(extractor)));
  }
  this.maxWidth = maxWidth;
  this.maxHeight = maxHeight;
  Arrays.sort(formats, new DecreasingBandwidthComparator());
}

项目：ExoPlayer 文件：SmoothStreamingChunkSource.java

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());
}