Java 类com.google.android.exoplayer.chunk.Mp4MediaChunk 实例源码

private Chunk newMediaChunk(RepresentationHolder representationHolder, DataSource dataSource,
    int segmentNum, int trigger) {
  Representation representation = representationHolder.representation;
  DashSegmentIndex segmentIndex = representationHolder.segmentIndex;

  long startTimeUs = segmentIndex.getTimeUs(segmentNum);
  long endTimeUs = startTimeUs + segmentIndex.getDurationUs(segmentNum);

  boolean isLastSegment = !currentManifest.dynamic
      && segmentNum == segmentIndex.getLastSegmentNum();
  int nextAbsoluteSegmentNum = isLastSegment ? -1
      : (representationHolder.segmentNumShift + segmentNum + 1);

  RangedUri segmentUri = segmentIndex.getSegmentUrl(segmentNum);
  DataSpec dataSpec = new DataSpec(segmentUri.getUri(), segmentUri.start, segmentUri.length,
      representation.getCacheKey());

  long presentationTimeOffsetUs = representation.presentationTimeOffsetMs * 1000;
  if (representation.format.mimeType.equals(MimeTypes.TEXT_VTT)) {
    if (representationHolder.vttHeaderOffsetUs != presentationTimeOffsetUs) {
      // Update the VTT header.
      headerBuilder.setLength(0);
      headerBuilder.append(WebvttParser.EXO_HEADER).append("=")
          .append(WebvttParser.OFFSET).append(presentationTimeOffsetUs).append("\n");
      representationHolder.vttHeader = headerBuilder.toString().getBytes();
      representationHolder.vttHeaderOffsetUs = presentationTimeOffsetUs;
    }
    return new SingleSampleMediaChunk(dataSource, dataSpec, representation.format, 0,
        startTimeUs, endTimeUs, nextAbsoluteSegmentNum, null, representationHolder.vttHeader);
  } else {
    return new Mp4MediaChunk(dataSource, dataSpec, representation.format, trigger, startTimeUs,
        endTimeUs, nextAbsoluteSegmentNum, representationHolder.extractor, psshInfo, false,
        presentationTimeOffsetUs);
  }
}

private static MediaChunk newMediaChunk(Format formatInfo, Uri uri, String cacheKey,
    Extractor extractor, Map<UUID, byte[]> psshInfo, DataSource dataSource, int chunkIndex,
    boolean isLast, long chunkStartTimeUs, long nextChunkStartTimeUs, int trigger) {
  int nextChunkIndex = isLast ? -1 : chunkIndex + 1;
  long nextStartTimeUs = isLast ? -1 : nextChunkStartTimeUs;
  long offset = 0;
  DataSpec dataSpec = new DataSpec(uri, offset, -1, cacheKey);
  // In SmoothStreaming each chunk contains sample timestamps relative to the start of the chunk.
  // To convert them the absolute timestamps, we need to set sampleOffsetUs to -chunkStartTimeUs.
  return new Mp4MediaChunk(dataSource, dataSpec, formatInfo, trigger, chunkStartTimeUs,
      nextStartTimeUs, nextChunkIndex, extractor, psshInfo, false, -chunkStartTimeUs);
}

private Chunk newMediaChunk(Representation representation, DashSegmentIndex segmentIndex,
    Extractor extractor, DataSource dataSource, int segmentNum, int trigger) {
  int lastSegmentNum = segmentIndex.getLastSegmentNum();
  int nextSegmentNum = segmentNum == lastSegmentNum ? -1 : segmentNum + 1;
  long startTimeUs = segmentIndex.getTimeUs(segmentNum);
  long endTimeUs = segmentNum < lastSegmentNum ? segmentIndex.getTimeUs(segmentNum + 1)
      : startTimeUs + segmentIndex.getDurationUs(segmentNum);
  RangedUri segmentUri = segmentIndex.getSegmentUrl(segmentNum);
  DataSpec dataSpec = new DataSpec(segmentUri.getUri(), segmentUri.start, segmentUri.length,
      representation.getCacheKey());
  return new Mp4MediaChunk(dataSource, dataSpec, representation.format, trigger, startTimeUs,
      endTimeUs, nextSegmentNum, extractor, false, 0);
}

private static MediaChunk newMediaChunk(Format formatInfo, Uri uri, String cacheKey,
    Extractor extractor, DataSource dataSource, int chunkIndex,
    boolean isLast, long chunkStartTimeUs, long nextChunkStartTimeUs, int trigger) {
  int nextChunkIndex = isLast ? -1 : chunkIndex + 1;
  long nextStartTimeUs = isLast ? -1 : nextChunkStartTimeUs;
  long offset = 0;
  DataSpec dataSpec = new DataSpec(uri, offset, -1, cacheKey);
  // In SmoothStreaming each chunk contains sample timestamps relative to the start of the chunk.
  // To convert them the absolute timestamps, we need to set sampleOffsetUs to -chunkStartTimeUs.
  return new Mp4MediaChunk(dataSource, dataSpec, formatInfo, trigger, chunkStartTimeUs,
      nextStartTimeUs, nextChunkIndex, extractor, false, -chunkStartTimeUs);
}