import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public void consume(ParsableByteArray data) {
  if (writingSample) {
    if (bytesToCheck == 2 && !checkNextByte(data, 0x20)) {
      // Failed to check data_identifier
      return;
    }
    if (bytesToCheck == 1 && !checkNextByte(data, 0x00)) {
      // Check and discard the subtitle_stream_id
      return;
    }
    int dataPosition = data.getPosition();
    int bytesAvailable = data.bytesLeft();
    for (TrackOutput output : outputs) {
      data.setPosition(dataPosition);
      output.sampleData(data, bytesAvailable);
    }
    sampleBytesWritten += bytesAvailable;
  }
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
public void testCustomPesReader() throws Exception {
  CustomEsReaderFactory factory = new CustomEsReaderFactory();
  TsExtractor tsExtractor = new TsExtractor(new TimestampAdjuster(0), factory, false);
  FakeExtractorInput input = new FakeExtractorInput.Builder()
      .setData(TestUtil.getByteArray(getInstrumentation(), "ts/sample.ts"))
      .setSimulateIOErrors(false)
      .setSimulateUnknownLength(false)
      .setSimulatePartialReads(false).build();
  FakeExtractorOutput output = new FakeExtractorOutput();
  tsExtractor.init(output);
  tsExtractor.seek(input.getPosition());
  PositionHolder seekPositionHolder = new PositionHolder();
  int readResult = Extractor.RESULT_CONTINUE;
  while (readResult != Extractor.RESULT_END_OF_INPUT) {
    readResult = tsExtractor.read(input, seekPositionHolder);
  }
  CustomEsReader reader = factory.reader;
  assertEquals(2, reader.packetsRead);
  TrackOutput trackOutput = reader.getTrackOutput();
  assertTrue(trackOutput == output.trackOutputs.get(257 /* PID of audio track. */));
  assertEquals(
      Format.createTextSampleFormat("Overriding format", "mime", null, 0, 0, "und", null, 0),
      ((FakeTrackOutput) trackOutput).format);
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
public void createTracks(ExtractorOutput extractorOutput, TrackIdGenerator idGenerator) {
  for (int i = 0; i < outputs.length; i++) {
    idGenerator.generateNewId();
    TrackOutput output = extractorOutput.track(idGenerator.getTrackId(), C.TRACK_TYPE_TEXT);
    Format channelFormat = closedCaptionFormats.get(i);
    String channelMimeType = channelFormat.sampleMimeType;
    Assertions.checkArgument(MimeTypes.APPLICATION_CEA608.equals(channelMimeType)
        || MimeTypes.APPLICATION_CEA708.equals(channelMimeType),
        "Invalid closed caption mime type provided: " + channelMimeType);
    String formatId = channelFormat.id != null ? channelFormat.id : idGenerator.getFormatId();
    output.format(Format.createTextSampleFormat(formatId, channelMimeType, null, Format.NO_VALUE,
        channelFormat.selectionFlags, channelFormat.language, channelFormat.accessibilityChannel,
        null));
    outputs[i] = output;
  }
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public int read(ExtractorInput input, PositionHolder seekPosition)
    throws IOException, InterruptedException {
  if (streamReader == null) {
    if (!sniffInternal(input)) {
      throw new ParserException("Failed to determine bitstream type");
    }
    input.resetPeekPosition();
  }
  if (!streamReaderInitialized) {
    TrackOutput trackOutput = output.track(0, C.TRACK_TYPE_AUDIO);
    output.endTracks();
    streamReader.init(output, trackOutput);
    streamReaderInitialized = true;
  }
  return streamReader.read(input, seekPosition);
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public TrackOutput track(int id, int type) {
  int trackCount = sampleQueues.length;
  for (int i = 0; i < trackCount; i++) {
    if (sampleQueueTrackIds[i] == id) {
      return sampleQueues[i];
    }
  }
  SampleQueue trackOutput = new SampleQueue(allocator);
  trackOutput.setUpstreamFormatChangeListener(this);
  sampleQueueTrackIds = Arrays.copyOf(sampleQueueTrackIds, trackCount + 1);
  sampleQueueTrackIds[trackCount] = id;
  sampleQueues = Arrays.copyOf(sampleQueues, trackCount + 1);
  sampleQueues[trackCount] = trackOutput;
  return trackOutput;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
public void testCustomPesReader() throws Exception {
  CustomTsPayloadReaderFactory factory = new CustomTsPayloadReaderFactory(true, false);
  TsExtractor tsExtractor = new TsExtractor(TsExtractor.MODE_MULTI_PMT, new TimestampAdjuster(0),
      factory);
  FakeExtractorInput input = new FakeExtractorInput.Builder()
      .setData(TestUtil.getByteArray(getInstrumentation(), "ts/sample.ts"))
      .setSimulateIOErrors(false)
      .setSimulateUnknownLength(false)
      .setSimulatePartialReads(false).build();
  FakeExtractorOutput output = new FakeExtractorOutput();
  tsExtractor.init(output);
  PositionHolder seekPositionHolder = new PositionHolder();
  int readResult = Extractor.RESULT_CONTINUE;
  while (readResult != Extractor.RESULT_END_OF_INPUT) {
    readResult = tsExtractor.read(input, seekPositionHolder);
  }
  CustomEsReader reader = factory.esReader;
  assertEquals(2, reader.packetsRead);
  TrackOutput trackOutput = reader.getTrackOutput();
  assertTrue(trackOutput == output.trackOutputs.get(257 /* PID of audio track. */));
  assertEquals(
      Format.createTextSampleFormat("1/257", "mime", null, 0, 0, "und", null, 0),
      ((FakeTrackOutput) trackOutput).format);
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
private TrackOutput buildTrackOutput(long subsampleOffsetUs) {
  TrackOutput trackOutput = output.track(0, C.TRACK_TYPE_TEXT);
  trackOutput.format(Format.createTextSampleFormat(null, MimeTypes.TEXT_VTT, null,
      Format.NO_VALUE, 0, language, null, subsampleOffsetUs));
  output.endTracks();
  return trackOutput;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
public SampleReader(TrackOutput output, boolean allowNonIdrKeyframes,
    boolean detectAccessUnits) {
  this.output = output;
  this.allowNonIdrKeyframes = allowNonIdrKeyframes;
  this.detectAccessUnits = detectAccessUnits;
  sps = new SparseArray<>();
  pps = new SparseArray<>();
  previousSliceHeader = new SliceHeaderData();
  sliceHeader = new SliceHeaderData();
  buffer = new byte[DEFAULT_BUFFER_SIZE];
  bitArray = new ParsableNalUnitBitArray(buffer, 0, 0);
  reset();
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
public void createTracks(ExtractorOutput extractorOutput, TrackIdGenerator idGenerator) {
  for (int i = 0; i < outputs.length; i++) {
    idGenerator.generateNewId();
    TrackOutput output = extractorOutput.track(idGenerator.getTrackId(), C.TRACK_TYPE_TEXT);
    Format channelFormat = closedCaptionFormats.get(i);
    String channelMimeType = channelFormat.sampleMimeType;
    Assertions.checkArgument(MimeTypes.APPLICATION_CEA608.equals(channelMimeType)
        || MimeTypes.APPLICATION_CEA708.equals(channelMimeType),
        "Invalid closed caption mime type provided: " + channelMimeType);
    output.format(Format.createTextSampleFormat(idGenerator.getFormatId(), channelMimeType, null,
        Format.NO_VALUE, channelFormat.selectionFlags, channelFormat.language,
        channelFormat.accessibilityChannel, null));
    outputs[i] = output;
  }
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
/**
 * Sets the state to STATE_READING_SAMPLE.
 *
 * @param outputToUse TrackOutput object to write the sample to
 * @param currentSampleDuration Duration of the sample to be read
 * @param priorReadBytes Size of prior read bytes
 * @param sampleSize Size of the sample
 */
private void setReadingSampleState(TrackOutput outputToUse, long currentSampleDuration,
    int priorReadBytes, int sampleSize) {
  state = STATE_READING_SAMPLE;
  bytesRead = priorReadBytes;
  this.currentOutput = outputToUse;
  this.currentSampleDuration = currentSampleDuration;
  this.sampleSize = sampleSize;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public void createTracks(ExtractorOutput extractorOutput, TrackIdGenerator idGenerator) {
  for (int i = 0; i < outputs.length; i++) {
    DvbSubtitleInfo subtitleInfo = subtitleInfos.get(i);
    idGenerator.generateNewId();
    TrackOutput output = extractorOutput.track(idGenerator.getTrackId(), C.TRACK_TYPE_TEXT);
    output.format(Format.createImageSampleFormat(idGenerator.getFormatId(),
        MimeTypes.APPLICATION_DVBSUBS, null, Format.NO_VALUE,
        Collections.singletonList(subtitleInfo.initializationData), subtitleInfo.language, null));
    outputs[i] = output;
  }
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public void packetFinished() {
  if (writingSample) {
    for (TrackOutput output : outputs) {
      output.sampleMetadata(sampleTimeUs, C.BUFFER_FLAG_KEY_FRAME, sampleBytesWritten, 0, null);
    }
    writingSample = false;
  }
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public void init(ExtractorOutput output) {
  TrackOutput trackOutput = output.track(0, C.TRACK_TYPE_AUDIO);
  output.endTracks();
  // TODO: fix the case if sniff() isn't called
  streamReader.init(output, trackOutput);
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
void init(ExtractorOutput output, TrackOutput trackOutput) {
  this.extractorOutput = output;
  this.trackOutput = trackOutput;
  this.oggPacket = new OggPacket();

  reset(true);
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
private void maybeInitExtraTracks() {
  if ((flags & FLAG_ENABLE_EMSG_TRACK) != 0 && eventMessageTrackOutput == null) {
    eventMessageTrackOutput = extractorOutput.track(trackBundles.size(), C.TRACK_TYPE_METADATA);
    eventMessageTrackOutput.format(Format.createSampleFormat(null, MimeTypes.APPLICATION_EMSG,
        Format.OFFSET_SAMPLE_RELATIVE));
  }
  if ((flags & FLAG_ENABLE_CEA608_TRACK) != 0 && cea608TrackOutputs == null) {
    TrackOutput cea608TrackOutput = extractorOutput.track(trackBundles.size() + 1,
        C.TRACK_TYPE_TEXT);
    cea608TrackOutput.format(Format.createTextSampleFormat(null, MimeTypes.APPLICATION_CEA608,
        null, Format.NO_VALUE, 0, null, null));
    cea608TrackOutputs = new TrackOutput[] {cea608TrackOutput};
  }
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
/**
 * Appends the corresponding encryption data to the {@link TrackOutput} contained in the given
 * {@link TrackBundle}.
 *
 * @param trackBundle The {@link TrackBundle} that contains the {@link Track} for which the
 *     Sample encryption data must be output.
 * @return The number of written bytes.
 */
private int appendSampleEncryptionData(TrackBundle trackBundle) {
  TrackFragment trackFragment = trackBundle.fragment;
  ParsableByteArray sampleEncryptionData = trackFragment.sampleEncryptionData;
  int sampleDescriptionIndex = trackFragment.header.sampleDescriptionIndex;
  TrackEncryptionBox encryptionBox = trackFragment.trackEncryptionBox != null
      ? trackFragment.trackEncryptionBox
      : trackBundle.track.sampleDescriptionEncryptionBoxes[sampleDescriptionIndex];
  int vectorSize = encryptionBox.initializationVectorSize;
  boolean subsampleEncryption = trackFragment
      .sampleHasSubsampleEncryptionTable[trackBundle.currentSampleIndex];

  // Write the signal byte, containing the vector size and the subsample encryption flag.
  encryptionSignalByte.data[0] = (byte) (vectorSize | (subsampleEncryption ? 0x80 : 0));
  encryptionSignalByte.setPosition(0);
  TrackOutput output = trackBundle.output;
  output.sampleData(encryptionSignalByte, 1);
  // Write the vector.
  output.sampleData(sampleEncryptionData, vectorSize);
  // If we don't have subsample encryption data, we're done.
  if (!subsampleEncryption) {
    return 1 + vectorSize;
  }
  // Write the subsample encryption data.
  int subsampleCount = sampleEncryptionData.readUnsignedShort();
  sampleEncryptionData.skipBytes(-2);
  int subsampleDataLength = 2 + 6 * subsampleCount;
  output.sampleData(sampleEncryptionData, subsampleDataLength);
  return 1 + vectorSize + subsampleDataLength;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
/**
 * Outputs up to {@code length} bytes of sample data to {@code output}, consisting of either
 * {@link #sampleStrippedBytes} or data read from {@code input}.
 */
private int readToOutput(ExtractorInput input, TrackOutput output, int length)
    throws IOException, InterruptedException {
  int bytesRead;
  int strippedBytesLeft = sampleStrippedBytes.bytesLeft();
  if (strippedBytesLeft > 0) {
    bytesRead = Math.min(length, strippedBytesLeft);
    output.sampleData(sampleStrippedBytes, bytesRead);
  } else {
    bytesRead = output.sampleData(input, length, false);
  }
  sampleBytesRead += bytesRead;
  sampleBytesWritten += bytesRead;
  return bytesRead;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
/**
 * Consumes the unescaped content of an SEI NAL unit, writing the content of any CEA-608 messages
 * as samples to all of the provided outputs.
 *
 * @param presentationTimeUs The presentation time in microseconds for any samples.
 * @param seiBuffer The unescaped SEI NAL unit data, excluding the NAL unit start code and type.
 * @param outputs The outputs to which any samples should be written.
 */
public static void consume(long presentationTimeUs, ParsableByteArray seiBuffer,
    TrackOutput[] outputs) {
  while (seiBuffer.bytesLeft() > 1 /* last byte will be rbsp_trailing_bits */) {
    int payloadType = readNon255TerminatedValue(seiBuffer);
    int payloadSize = readNon255TerminatedValue(seiBuffer);
    // Process the payload.
    if (payloadSize == -1 || payloadSize > seiBuffer.bytesLeft()) {
      // This might occur if we're trying to read an encrypted SEI NAL unit.
      Log.w(TAG, "Skipping remainder of malformed SEI NAL unit.");
      seiBuffer.setPosition(seiBuffer.limit());
    } else if (isSeiMessageCea608(payloadType, payloadSize, seiBuffer)) {
      // Ignore country_code (1) + provider_code (2) + user_identifier (4)
      // + user_data_type_code (1).
      seiBuffer.skipBytes(8);
      // Ignore first three bits: reserved (1) + process_cc_data_flag (1) + zero_bit (1).
      int ccCount = seiBuffer.readUnsignedByte() & 0x1F;
      // Ignore em_data (1)
      seiBuffer.skipBytes(1);
      // Each data packet consists of 24 bits: marker bits (5) + cc_valid (1) + cc_type (2)
      // + cc_data_1 (8) + cc_data_2 (8).
      int sampleLength = ccCount * 3;
      int sampleStartPosition = seiBuffer.getPosition();
      for (TrackOutput output : outputs) {
        seiBuffer.setPosition(sampleStartPosition);
        output.sampleData(seiBuffer, sampleLength);
        output.sampleMetadata(presentationTimeUs, C.BUFFER_FLAG_KEY_FRAME, sampleLength, 0, null);
      }
      // Ignore trailing information in SEI, if any.
      seiBuffer.skipBytes(payloadSize - (10 + ccCount * 3));
    } else {
      seiBuffer.skipBytes(payloadSize);
    }
  }
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public TrackOutput track(int id, int type) {
  BindingTrackOutput bindingTrackOutput = bindingTrackOutputs.get(id);
  if (bindingTrackOutput == null) {
    // Assert that if we're seeing a new track we have not seen endTracks.
    Assertions.checkState(sampleFormats == null);
    bindingTrackOutput = new BindingTrackOutput(id, type, manifestFormat);
    bindingTrackOutput.bind(trackOutputProvider);
    bindingTrackOutputs.put(id, bindingTrackOutput);
  }
  return bindingTrackOutput;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入依赖的package包/类
@Override
public TrackOutput track(int id, int type) {
  for (int i = 0; i < trackTypes.length; i++) {
    if (type == trackTypes[i]) {
      return trackOutputs[i];
    }
  }
  Log.e(TAG, "Unmatched track of type: " + type);
  return new DummyTrackOutput();
}