import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
private Chunk newInitializationChunk(RangedUri initializationUri, RangedUri indexUri,
    Representation representation, ChunkExtractorWrapper extractor, DataSource dataSource,
    int trigger) {
  RangedUri requestUri;
  if (initializationUri != null) {
    // It's common for initialization and index data to be stored adjacently. Attempt to merge
    // the two requests together to request both at once.
    requestUri = initializationUri.attemptMerge(indexUri);
    if (requestUri == null) {
      requestUri = initializationUri;
    }
  } else {
    requestUri = indexUri;
  }
  DataSpec dataSpec = new DataSpec(requestUri.getUri(), requestUri.start, requestUri.length,
      representation.getCacheKey());
  return new InitializationChunk(dataSource, dataSpec, trigger, representation.format, extractor);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
private Chunk newInitializationChunk(RangedUri initializationUri, RangedUri indexUri,
    Representation representation, ChunkExtractorWrapper extractor, DataSource dataSource,
    int manifestIndex, int trigger) {
  RangedUri requestUri;
  if (initializationUri != null) {
    // It's common for initialization and index data to be stored adjacently. Attempt to merge
    // the two requests together to request both at once.
    requestUri = initializationUri.attemptMerge(indexUri);
    if (requestUri == null) {
      requestUri = initializationUri;
    }
  } else {
    requestUri = indexUri;
  }
  DataSpec dataSpec = new DataSpec(requestUri.getUri(), requestUri.start, requestUri.length,
      representation.getCacheKey());
  return new InitializationChunk(dataSource, dataSpec, trigger, representation.format,
      extractor, manifestIndex);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
protected Chunk newMediaChunk(
    PeriodHolder periodHolder, RepresentationHolder representationHolder, DataSource dataSource,
    MediaFormat mediaFormat, ExposedTrack enabledTrack, int segmentNum, int trigger) {
  Representation representation = representationHolder.representation;
  Format format = representation.format;
  long startTimeUs = representationHolder.getSegmentStartTimeUs(segmentNum);
  long endTimeUs = representationHolder.getSegmentEndTimeUs(segmentNum);
  RangedUri segmentUri = representationHolder.getSegmentUrl(segmentNum);
  DataSpec dataSpec = new DataSpec(segmentUri.getUri(), segmentUri.start, segmentUri.length,
      representation.getCacheKey());

  long sampleOffsetUs = periodHolder.startTimeUs - representation.presentationTimeOffsetUs;
  if (mimeTypeIsRawText(format.mimeType)) {
    return new SingleSampleMediaChunk(dataSource, dataSpec, Chunk.TRIGGER_INITIAL, format,
        startTimeUs, endTimeUs, segmentNum, enabledTrack.trackFormat, null,
        periodHolder.localIndex);
  } else {
    boolean isMediaFormatFinal = (mediaFormat != null);
    return new ContainerMediaChunk(dataSource, dataSpec, trigger, format, startTimeUs, endTimeUs,
        segmentNum, sampleOffsetUs, representationHolder.extractorWrapper, mediaFormat,
        enabledTrack.adaptiveMaxWidth, enabledTrack.adaptiveMaxHeight, periodHolder.drmInitData,
        isMediaFormatFinal, periodHolder.localIndex);
  }
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
private static Representation buildSegmentTimelineRepresentation(long timelineDurationMs,
    long timelineStartTimeMs) {
  List<SegmentTimelineElement> segmentTimeline = new ArrayList<>();
  List<RangedUri> mediaSegments = new ArrayList<>();
  long segmentStartTimeMs = timelineStartTimeMs;
  long byteStart = 0;
  // Create all but the last segment with LIVE_SEGMENT_DURATION_MS.
  int segmentCount = (int) Util.ceilDivide(timelineDurationMs, LIVE_SEGMENT_DURATION_MS);
  for (int i = 0; i < segmentCount - 1; i++) {
    segmentTimeline.add(new SegmentTimelineElement(segmentStartTimeMs, LIVE_SEGMENT_DURATION_MS));
    mediaSegments.add(new RangedUri("", "", byteStart, 500L));
    segmentStartTimeMs += LIVE_SEGMENT_DURATION_MS;
    byteStart += 500;
  }
  // The final segment duration is calculated so that the total duration is timelineDurationMs.
  long finalSegmentDurationMs = (timelineStartTimeMs + timelineDurationMs) - segmentStartTimeMs;
  segmentTimeline.add(new SegmentTimelineElement(segmentStartTimeMs, finalSegmentDurationMs));
  mediaSegments.add(new RangedUri("", "", byteStart, 500L));
  segmentStartTimeMs += finalSegmentDurationMs;
  byteStart += 500;
  // Construct the list.
  MultiSegmentBase segmentBase = new SegmentList(null, 1000, 0, 0, 0, segmentTimeline,
      mediaSegments);
  return Representation.newInstance(null, 0, REGULAR_VIDEO, segmentBase);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
private static Representation generateSegmentTimelineRepresentation(long segmentStartMs,
    long periodStartMs, long duration) {
  List<SegmentTimelineElement> segmentTimeline = new ArrayList<>();
  List<RangedUri> mediaSegments = new ArrayList<>();
  long segmentStartTimeMs = segmentStartMs;
  long byteStart = 0;
  for (int i = 0; i < (duration / LIVE_SEGMENT_DURATION_MS); i++) {
    segmentTimeline.add(new SegmentTimelineElement(segmentStartTimeMs, LIVE_SEGMENT_DURATION_MS));
    mediaSegments.add(new RangedUri("", "", byteStart, 500L));
    segmentStartTimeMs += LIVE_SEGMENT_DURATION_MS;
    byteStart += 500;
  }

  int startNumber = (int) ((periodStartMs + segmentStartMs) / LIVE_SEGMENT_DURATION_MS);
  MultiSegmentBase segmentBase = new SegmentList(null, 1000, 0,
      TrackRenderer.UNKNOWN_TIME_US, startNumber, TrackRenderer.UNKNOWN_TIME_US, segmentTimeline,
      mediaSegments);
  return Representation.newInstance(periodStartMs, TrackRenderer.UNKNOWN_TIME_US, null, 0,
      REGULAR_VIDEO, segmentBase);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
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);

  int absoluteSegmentNum = segmentNum + representationHolder.segmentNumShift;
  boolean isLastSegment = !currentManifest.dynamic
      && segmentNum == segmentIndex.getLastSegmentNum();

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

  long sampleOffsetUs = representation.periodStartMs * 1000
      - representation.presentationTimeOffsetUs;
  if (representation.format.mimeType.equals(MimeTypes.TEXT_VTT)) {
    if (representationHolder.vttHeaderOffsetUs != sampleOffsetUs) {
      // Update the VTT header.
      headerBuilder.setLength(0);
      headerBuilder.append(C.WEBVTT_EXO_HEADER).append("=")
          .append(C.WEBVTT_EXO_HEADER_OFFSET).append(sampleOffsetUs)
          .append("\n");
      representationHolder.vttHeader = headerBuilder.toString().getBytes();
      representationHolder.vttHeaderOffsetUs = sampleOffsetUs;
    }
    return new SingleSampleMediaChunk(dataSource, dataSpec, Chunk.TRIGGER_INITIAL,
        representation.format, startTimeUs, endTimeUs, absoluteSegmentNum, isLastSegment,
        MediaFormat.createTextFormat(MimeTypes.TEXT_VTT), null, representationHolder.vttHeader);
  } else {
    return new ContainerMediaChunk(dataSource, dataSpec, trigger, representation.format,
        startTimeUs, endTimeUs, absoluteSegmentNum, isLastSegment, sampleOffsetUs,
        representationHolder.extractorWrapper, representationHolder.format, drmInitData, true);
  }
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
private Chunk newInitializationChunk(RangedUri initializationUri, RangedUri indexUri,
    Representation representation, Extractor extractor, DataSource dataSource,
    int trigger) {
  int expectedExtractorResult = Extractor.RESULT_END_OF_STREAM;
  long indexAnchor = 0;
  RangedUri requestUri;
  if (initializationUri != null) {
    // It's common for initialization and index data to be stored adjacently. Attempt to merge
    // the two requests together to request both at once.
    expectedExtractorResult |= Extractor.RESULT_READ_INIT;
    requestUri = initializationUri.attemptMerge(indexUri);
    if (requestUri != null) {
      expectedExtractorResult |= Extractor.RESULT_READ_INDEX;
      if (extractor.hasRelativeIndexOffsets()) {
        indexAnchor = indexUri.start + indexUri.length;
      }
    } else {
      requestUri = initializationUri;
    }
  } else {
    requestUri = indexUri;
    if (extractor.hasRelativeIndexOffsets()) {
      indexAnchor = indexUri.start + indexUri.length;
    }
    expectedExtractorResult |= Extractor.RESULT_READ_INDEX;
  }
  DataSpec dataSpec = new DataSpec(requestUri.getUri(), requestUri.start, requestUri.length,
      representation.getCacheKey());

  return new InitializationLoadable(dataSource, dataSpec, trigger, representation.format,
      extractor, expectedExtractorResult, indexAnchor);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
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);
  }
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
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.presentationTimeOffsetUs;
  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 ContainerMediaChunk(dataSource, dataSpec, representation.format, trigger,
        startTimeUs, endTimeUs, nextAbsoluteSegmentNum, representationHolder.extractor, psshInfo,
        false, presentationTimeOffsetUs);
  }
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
private Chunk newInitializationChunk(RangedUri initializationUri, RangedUri indexUri,
    Representation representation, Extractor extractor, DataSource dataSource,
    int trigger) {
  int expectedExtractorResult = Extractor.RESULT_END_OF_STREAM;
  long indexAnchor = 0;
  RangedUri requestUri;
  if (initializationUri != null) {
    // It's common for initialization and index data to be stored adjacently. Attempt to merge
    // the two requests together to request both at once.
    expectedExtractorResult |= Extractor.RESULT_READ_INIT;
    requestUri = initializationUri.attemptMerge(indexUri);
    if (requestUri != null) {
      expectedExtractorResult |= Extractor.RESULT_READ_INDEX;
      if (extractor.hasRelativeIndexOffsets()) {
        indexAnchor = indexUri.start + indexUri.length;
      }
    } else {
      requestUri = initializationUri;
    }
  } else {
    requestUri = indexUri;
    if (extractor.hasRelativeIndexOffsets()) {
      indexAnchor = indexUri.start + indexUri.length;
    }
    expectedExtractorResult |= Extractor.RESULT_READ_INDEX;
  }
  DataSpec dataSpec = new DataSpec(requestUri.getUri(), requestUri.start, requestUri.length,
      representation.getCacheKey());
  return new InitializationLoadable(dataSource, dataSpec, trigger, representation.format,
      extractor, expectedExtractorResult, indexAnchor);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
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);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
@Override
public RangedUri getSegmentUrl(int segmentNum) {
  return new RangedUri(uri, null, chunkIndex.offsets[segmentNum], chunkIndex.sizes[segmentNum]);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
public RangedUri getSegmentUrl(int segmentNum) {
  return segmentIndex.getSegmentUrl(segmentNum - segmentNumShift);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
private static Representation buildVodRepresentation(Format format) {
  RangedUri rangedUri = new RangedUri("https://example.com/1.mp4", null, 0, 100);
  SingleSegmentBase segmentBase = new SingleSegmentBase(rangedUri, 1, 0,
      "https://example.com/1.mp4", 0, -1);
  return Representation.newInstance(null, 0, format, segmentBase);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
@Override
public RangedUri getSegmentUrl(int segmentNum) {
  return new RangedUri(uri, null, indexAnchor + segmentIndex.offsets[segmentNum],
      segmentIndex.sizes[segmentNum]);
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
/**
 * @param startTimeUs The start time of the segment, in microseconds.
 * @param durationUs The duration of the segment, in microseconds.
 * @param uri A {@link RangedUri} defining the location of the segment data.
 */
public DashSingleSegmentIndex(long startTimeUs, long durationUs, RangedUri uri) {
  this.startTimeUs = startTimeUs;
  this.durationUs = durationUs;
  this.uri = uri;
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
@Override
public RangedUri getSegmentUrl(int segmentNum) {
  return uri;
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
@Override
public final void getChunkOperation(List<? extends MediaChunk> queue, long seekPositionUs,
    long playbackPositionUs, ChunkOperationHolder out) {
  evaluation.queueSize = queue.size();
  if (evaluation.format == null || !lastChunkWasInitialization) {
    evaluator.evaluate(queue, playbackPositionUs, formats, evaluation);
  }
  Format selectedFormat = evaluation.format;
  out.queueSize = evaluation.queueSize;

  if (selectedFormat == null) {
    out.chunk = null;
    return;
  } else if (out.queueSize == queue.size() && out.chunk != null
      && out.chunk.format.id.equals(selectedFormat.id)) {
    // We already have a chunk, and the evaluation hasn't changed either the format or the size
    // of the queue. Leave unchanged.
    return;
  }

  Representation selectedRepresentation = representations.get(selectedFormat.id);
  Extractor extractor = extractors.get(selectedRepresentation.format.id);

  RangedUri pendingInitializationUri = null;
  RangedUri pendingIndexUri = null;
  if (extractor.getFormat() == null) {
    pendingInitializationUri = selectedRepresentation.getInitializationUri();
  }
  if (!segmentIndexes.containsKey(selectedRepresentation.format.id)) {
    pendingIndexUri = selectedRepresentation.getIndexUri();
  }
  if (pendingInitializationUri != null || pendingIndexUri != null) {
    // We have initialization and/or index requests to make.
    Chunk initializationChunk = newInitializationChunk(pendingInitializationUri, pendingIndexUri,
        selectedRepresentation, extractor, dataSource, evaluation.trigger);
    lastChunkWasInitialization = true;
    out.chunk = initializationChunk;
    return;
  }

  int nextSegmentNum;
  DashSegmentIndex segmentIndex = segmentIndexes.get(selectedRepresentation.format.id);
  if (queue.isEmpty()) {
    nextSegmentNum = segmentIndex.getSegmentNum(seekPositionUs);
  } else {
    nextSegmentNum = queue.get(out.queueSize - 1).nextChunkIndex;
  }

  if (nextSegmentNum == -1) {
    out.chunk = null;
    return;
  }

  Chunk nextMediaChunk = newMediaChunk(selectedRepresentation, segmentIndex, extractor,
      dataSource, nextSegmentNum, evaluation.trigger);
  lastChunkWasInitialization = false;
  out.chunk = nextMediaChunk;
}
 

import com.google.android.exoplayer.dash.mpd.RangedUri; //导入依赖的package包/类
/**
 * Returns a {@link RangedUri} defining the location of a segment.
 *
 * @param segmentNum The segment number.
 * @return The {@link RangedUri} defining the location of the data.
 */
RangedUri getSegmentUrl(int segmentNum);