Java TrackOutput.sampleData方法代码示例

import com.google.android.exoplayer2.extractor.TrackOutput; //导入方法依赖的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; //导入方法依赖的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; //导入方法依赖的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; //导入方法依赖的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; //导入方法依赖的package包/类
@SuppressWarnings("NonAtomicVolatileUpdate")
@Override
public void load() throws IOException, InterruptedException {
  DataSpec loadDataSpec = Util.getRemainderDataSpec(dataSpec, bytesLoaded);
  try {
    // Create and open the input.
    long length = dataSource.open(loadDataSpec);
    if (length != C.LENGTH_UNSET) {
      length += bytesLoaded;
    }
    ExtractorInput extractorInput = new DefaultExtractorInput(dataSource, bytesLoaded, length);
    BaseMediaChunkOutput output = getOutput();
    output.setSampleOffsetUs(0);
    TrackOutput trackOutput = output.track(0, trackType);
    trackOutput.format(sampleFormat);
    // Load the sample data.
    int result = 0;
    while (result != C.RESULT_END_OF_INPUT) {
      bytesLoaded += result;
      result = trackOutput.sampleData(extractorInput, Integer.MAX_VALUE, true);
    }
    int sampleSize = bytesLoaded;
    trackOutput.sampleMetadata(startTimeUs, C.BUFFER_FLAG_KEY_FRAME, sampleSize, 0, null);
  } finally {
    Util.closeQuietly(dataSource);
  }
  loadCompleted = true;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入方法依赖的package包/类
@SuppressWarnings("NonAtomicVolatileUpdate")
@Override
public void load() throws IOException, InterruptedException {
  DataSpec loadDataSpec = dataSpec.subrange(bytesLoaded);
  try {
    // Create and open the input.
    long length = dataSource.open(loadDataSpec);
    if (length != C.LENGTH_UNSET) {
      length += bytesLoaded;
    }
    ExtractorInput extractorInput = new DefaultExtractorInput(dataSource, bytesLoaded, length);
    BaseMediaChunkOutput output = getOutput();
    output.setSampleOffsetUs(0);
    TrackOutput trackOutput = output.track(0, trackType);
    trackOutput.format(sampleFormat);
    // Load the sample data.
    int result = 0;
    while (result != C.RESULT_END_OF_INPUT) {
      bytesLoaded += result;
      result = trackOutput.sampleData(extractorInput, Integer.MAX_VALUE, true);
    }
    int sampleSize = bytesLoaded;
    trackOutput.sampleMetadata(startTimeUs, C.BUFFER_FLAG_KEY_FRAME, sampleSize, 0, null);
  } finally {
    Util.closeQuietly(dataSource);
  }
  loadCompleted = true;
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入方法依赖的package包/类
private void processSample() throws ParserException {
  ParsableByteArray webvttData = new ParsableByteArray(sampleData);

  // Validate the first line of the header.
  try {
    WebvttParserUtil.validateWebvttHeaderLine(webvttData);
  } catch (SubtitleDecoderException e) {
    throw new ParserException(e);
  }

  // Defaults to use if the header doesn't contain an X-TIMESTAMP-MAP header.
  long vttTimestampUs = 0;
  long tsTimestampUs = 0;

  // Parse the remainder of the header looking for X-TIMESTAMP-MAP.
  String line;
  while (!TextUtils.isEmpty(line = webvttData.readLine())) {
    if (line.startsWith("X-TIMESTAMP-MAP")) {
      Matcher localTimestampMatcher = LOCAL_TIMESTAMP.matcher(line);
      if (!localTimestampMatcher.find()) {
        throw new ParserException("X-TIMESTAMP-MAP doesn't contain local timestamp: " + line);
      }
      Matcher mediaTimestampMatcher = MEDIA_TIMESTAMP.matcher(line);
      if (!mediaTimestampMatcher.find()) {
        throw new ParserException("X-TIMESTAMP-MAP doesn't contain media timestamp: " + line);
      }
      vttTimestampUs = WebvttParserUtil.parseTimestampUs(localTimestampMatcher.group(1));
      tsTimestampUs = TimestampAdjuster.ptsToUs(
          Long.parseLong(mediaTimestampMatcher.group(1)));
    }
  }

  // Find the first cue header and parse the start time.
  Matcher cueHeaderMatcher = WebvttParserUtil.findNextCueHeader(webvttData);
  if (cueHeaderMatcher == null) {
    // No cues found. Don't output a sample, but still output a corresponding track.
    buildTrackOutput(0);
    return;
  }

  long firstCueTimeUs = WebvttParserUtil.parseTimestampUs(cueHeaderMatcher.group(1));
  long sampleTimeUs = timestampAdjuster.adjustSampleTimestamp(
      firstCueTimeUs + tsTimestampUs - vttTimestampUs);
  long subsampleOffsetUs = sampleTimeUs - firstCueTimeUs;
  // Output the track.
  TrackOutput trackOutput = buildTrackOutput(subsampleOffsetUs);
  // Output the sample.
  sampleDataWrapper.reset(sampleData, sampleSize);
  trackOutput.sampleData(sampleDataWrapper, sampleSize);
  trackOutput.sampleMetadata(sampleTimeUs, C.BUFFER_FLAG_KEY_FRAME, sampleSize, 0, null);
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入方法依赖的package包/类
private void processSample() throws ParserException {
  ParsableByteArray webvttData = new ParsableByteArray(sampleData);

  // Validate the first line of the header.
  try {
    WebvttParserUtil.validateWebvttHeaderLine(webvttData);
  } catch (SubtitleDecoderException e) {
    throw new ParserException(e);
  }

  // Defaults to use if the header doesn't contain an X-TIMESTAMP-MAP header.
  long vttTimestampUs = 0;
  long tsTimestampUs = 0;

  // Parse the remainder of the header looking for X-TIMESTAMP-MAP.
  String line;
  while (!TextUtils.isEmpty(line = webvttData.readLine())) {
    if (line.startsWith("X-TIMESTAMP-MAP")) {
      Matcher localTimestampMatcher = LOCAL_TIMESTAMP.matcher(line);
      if (!localTimestampMatcher.find()) {
        throw new ParserException("X-TIMESTAMP-MAP doesn't contain local timestamp: " + line);
      }
      Matcher mediaTimestampMatcher = MEDIA_TIMESTAMP.matcher(line);
      if (!mediaTimestampMatcher.find()) {
        throw new ParserException("X-TIMESTAMP-MAP doesn't contain media timestamp: " + line);
      }
      vttTimestampUs = WebvttParserUtil.parseTimestampUs(localTimestampMatcher.group(1));
      tsTimestampUs = TimestampAdjuster.ptsToUs(Long.parseLong(mediaTimestampMatcher.group(1)));
    }
  }

  // Find the first cue header and parse the start time.
  Matcher cueHeaderMatcher = WebvttParserUtil.findNextCueHeader(webvttData);
  if (cueHeaderMatcher == null) {
    // No cues found. Don't output a sample, but still output a corresponding track.
    buildTrackOutput(0);
    return;
  }

  long firstCueTimeUs = WebvttParserUtil.parseTimestampUs(cueHeaderMatcher.group(1));
  long sampleTimeUs = timestampAdjuster.adjustTsTimestamp(
      TimestampAdjuster.usToPts(firstCueTimeUs + tsTimestampUs - vttTimestampUs));
  long subsampleOffsetUs = sampleTimeUs - firstCueTimeUs;
  // Output the track.
  TrackOutput trackOutput = buildTrackOutput(subsampleOffsetUs);
  // Output the sample.
  sampleDataWrapper.reset(sampleData, sampleSize);
  trackOutput.sampleData(sampleDataWrapper, sampleSize);
  trackOutput.sampleMetadata(sampleTimeUs, C.BUFFER_FLAG_KEY_FRAME, sampleSize, 0, null);
}
 

import com.google.android.exoplayer2.extractor.TrackOutput; //导入方法依赖的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;
  int sampleDescriptionIndex = trackFragment.header.sampleDescriptionIndex;
  TrackEncryptionBox encryptionBox = trackFragment.trackEncryptionBox != null
      ? trackFragment.trackEncryptionBox
      : trackBundle.track.getSampleDescriptionEncryptionBox(sampleDescriptionIndex);

  ParsableByteArray initializationVectorData;
  int vectorSize;
  if (encryptionBox.initializationVectorSize != 0) {
    initializationVectorData = trackFragment.sampleEncryptionData;
    vectorSize = encryptionBox.initializationVectorSize;
  } else {
    // The default initialization vector should be used.
    byte[] initVectorData = encryptionBox.defaultInitializationVector;
    defaultInitializationVector.reset(initVectorData, initVectorData.length);
    initializationVectorData = defaultInitializationVector;
    vectorSize = initVectorData.length;
  }

  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(initializationVectorData, vectorSize);
  // If we don't have subsample encryption data, we're done.
  if (!subsampleEncryption) {
    return 1 + vectorSize;
  }
  // Write the subsample encryption data.
  ParsableByteArray subsampleEncryptionData = trackFragment.sampleEncryptionData;
  int subsampleCount = subsampleEncryptionData.readUnsignedShort();
  subsampleEncryptionData.skipBytes(-2);
  int subsampleDataLength = 2 + 6 * subsampleCount;
  output.sampleData(subsampleEncryptionData, subsampleDataLength);
  return 1 + vectorSize + subsampleDataLength;
}