Java Code Examples for com.google.android.exoplayer2.metadata.id3.Id3Decoder#ID3_HEADER_LENGTH

/**
 * Peeks ID3 data from the input and parses the first ID3 tag.
 *
 * @param input The {@link ExtractorInput} from which data should be peeked.
 * @param id3FramePredicate Determines which ID3 frames are decoded. May be null to decode all
 *     frames.
 * @return The first ID3 tag decoded into a {@link Metadata} object. May be null if ID3 tag is not
 *     present in the input.
 * @throws IOException If an error occurred peeking from the input.
 * @throws InterruptedException If the thread was interrupted.
 */
@Nullable
public Metadata peekId3Data(
    ExtractorInput input, @Nullable Id3Decoder.FramePredicate id3FramePredicate)
    throws IOException, InterruptedException {
  int peekedId3Bytes = 0;
  Metadata metadata = null;
  while (true) {
    try {
      input.peekFully(scratch.data, /* offset= */ 0, Id3Decoder.ID3_HEADER_LENGTH);
    } catch (EOFException e) {
      // If input has less than ID3_HEADER_LENGTH, ignore the rest.
      break;
    }
    scratch.setPosition(0);
    if (scratch.readUnsignedInt24() != Id3Decoder.ID3_TAG) {
      // Not an ID3 tag.
      break;
    }
    scratch.skipBytes(3); // Skip major version, minor version and flags.
    int framesLength = scratch.readSynchSafeInt();
    int tagLength = Id3Decoder.ID3_HEADER_LENGTH + framesLength;

    if (metadata == null) {
      byte[] id3Data = new byte[tagLength];
      System.arraycopy(scratch.data, 0, id3Data, 0, Id3Decoder.ID3_HEADER_LENGTH);
      input.peekFully(id3Data, Id3Decoder.ID3_HEADER_LENGTH, framesLength);

      metadata = new Id3Decoder(id3FramePredicate).decode(id3Data, tagLength);
    } else {
      input.advancePeekPosition(framesLength);
    }

    peekedId3Bytes += tagLength;
  }

  input.resetPeekPosition();
  input.advancePeekPosition(peekedId3Bytes);
  return metadata;
}
 

/**
 * Peeks ID3 data from the input and parses the first ID3 tag.
 *
 * @param input The {@link ExtractorInput} from which data should be peeked.
 * @param id3FramePredicate Determines which ID3 frames are decoded. May be null to decode all
 *     frames.
 * @return The first ID3 tag decoded into a {@link Metadata} object. May be null if ID3 tag is not
 *     present in the input.
 * @throws IOException If an error occurred peeking from the input.
 * @throws InterruptedException If the thread was interrupted.
 */
@Nullable
public Metadata peekId3Data(
    ExtractorInput input, @Nullable Id3Decoder.FramePredicate id3FramePredicate)
    throws IOException, InterruptedException {
  int peekedId3Bytes = 0;
  Metadata metadata = null;
  while (true) {
    try {
      input.peekFully(scratch.data, 0, Id3Decoder.ID3_HEADER_LENGTH);
    } catch (EOFException e) {
      // If input has less than ID3_HEADER_LENGTH, ignore the rest.
      break;
    }
    scratch.setPosition(0);
    if (scratch.readUnsignedInt24() != Id3Decoder.ID3_TAG) {
      // Not an ID3 tag.
      break;
    }
    scratch.skipBytes(3); // Skip major version, minor version and flags.
    int framesLength = scratch.readSynchSafeInt();
    int tagLength = Id3Decoder.ID3_HEADER_LENGTH + framesLength;

    if (metadata == null) {
      byte[] id3Data = new byte[tagLength];
      System.arraycopy(scratch.data, 0, id3Data, 0, Id3Decoder.ID3_HEADER_LENGTH);
      input.peekFully(id3Data, Id3Decoder.ID3_HEADER_LENGTH, framesLength);

      metadata = new Id3Decoder(id3FramePredicate).decode(id3Data, tagLength);
    } else {
      input.advancePeekPosition(framesLength);
    }

    peekedId3Bytes += tagLength;
  }

  input.resetPeekPosition();
  input.advancePeekPosition(peekedId3Bytes);
  return metadata;
}
 

/**
 * Peeks ID3 data from the input and parses the first ID3 tag.
 *
 * @param input The {@link ExtractorInput} from which data should be peeked.
 * @param id3FramePredicate Determines which ID3 frames are decoded. May be null to decode all
 *     frames.
 * @return The first ID3 tag decoded into a {@link Metadata} object. May be null if ID3 tag is not
 *     present in the input.
 * @throws IOException If an error occurred peeking from the input.
 * @throws InterruptedException If the thread was interrupted.
 */
@Nullable
public Metadata peekId3Data(
    ExtractorInput input, @Nullable Id3Decoder.FramePredicate id3FramePredicate)
    throws IOException, InterruptedException {
  int peekedId3Bytes = 0;
  Metadata metadata = null;
  while (true) {
    try {
      input.peekFully(scratch.data, 0, Id3Decoder.ID3_HEADER_LENGTH);
    } catch (EOFException e) {
      // If input has less than ID3_HEADER_LENGTH, ignore the rest.
      break;
    }
    scratch.setPosition(0);
    if (scratch.readUnsignedInt24() != Id3Decoder.ID3_TAG) {
      // Not an ID3 tag.
      break;
    }
    scratch.skipBytes(3); // Skip major version, minor version and flags.
    int framesLength = scratch.readSynchSafeInt();
    int tagLength = Id3Decoder.ID3_HEADER_LENGTH + framesLength;

    if (metadata == null) {
      byte[] id3Data = new byte[tagLength];
      System.arraycopy(scratch.data, 0, id3Data, 0, Id3Decoder.ID3_HEADER_LENGTH);
      input.peekFully(id3Data, Id3Decoder.ID3_HEADER_LENGTH, framesLength);

      metadata = new Id3Decoder(id3FramePredicate).decode(id3Data, tagLength);
    } else {
      input.advancePeekPosition(framesLength);
    }

    peekedId3Bytes += tagLength;
  }

  input.resetPeekPosition();
  input.advancePeekPosition(peekedId3Bytes);
  return metadata;
}
 

/**
 * Peeks ID3 data from the input, including gapless playback information.
 *
 * @param input The {@link ExtractorInput} from which data should be peeked.
 * @throws IOException If an error occurred peeking from the input.
 * @throws InterruptedException If the thread was interrupted.
 */
private void peekId3Data(ExtractorInput input) throws IOException, InterruptedException {
  int peekedId3Bytes = 0;
  while (true) {
    input.peekFully(scratch.data, 0, Id3Decoder.ID3_HEADER_LENGTH);
    scratch.setPosition(0);
    if (scratch.readUnsignedInt24() != Id3Decoder.ID3_TAG) {
      // Not an ID3 tag.
      break;
    }
    scratch.skipBytes(3); // Skip major version, minor version and flags.
    int framesLength = scratch.readSynchSafeInt();
    int tagLength = Id3Decoder.ID3_HEADER_LENGTH + framesLength;

    if (metadata == null) {
      byte[] id3Data = new byte[tagLength];
      System.arraycopy(scratch.data, 0, id3Data, 0, Id3Decoder.ID3_HEADER_LENGTH);
      input.peekFully(id3Data, Id3Decoder.ID3_HEADER_LENGTH, framesLength);
      // We need to parse enough ID3 metadata to retrieve any gapless playback information even
      // if ID3 metadata parsing is disabled.
      Id3Decoder.FramePredicate id3FramePredicate = (flags & FLAG_DISABLE_ID3_METADATA) != 0
          ? GaplessInfoHolder.GAPLESS_INFO_ID3_FRAME_PREDICATE : null;
      metadata = new Id3Decoder(id3FramePredicate).decode(id3Data, tagLength);
      if (metadata != null) {
        gaplessInfoHolder.setFromMetadata(metadata);
      }
    } else {
      input.advancePeekPosition(framesLength);
    }

    peekedId3Bytes += tagLength;
  }

  input.resetPeekPosition();
  input.advancePeekPosition(peekedId3Bytes);
}
 

/**
 * @param dataSource The source from which the data should be loaded.
 * @param dataSpec Defines the data to be loaded.
 * @param initDataSpec Defines the initialization data to be fed to new extractors. May be null.
 * @param hlsUrl The url of the playlist from which this chunk was obtained.
 * @param muxedCaptionFormats List of muxed caption {@link Format}s.
 * @param trackSelectionReason See {@link #trackSelectionReason}.
 * @param trackSelectionData See {@link #trackSelectionData}.
 * @param startTimeUs The start time of the chunk in microseconds.
 * @param endTimeUs The end time of the chunk in microseconds.
 * @param chunkIndex The media sequence number of the chunk.
 * @param discontinuitySequenceNumber The discontinuity sequence number of the chunk.
 * @param isMasterTimestampSource True if the chunk can initialize the timestamp adjuster.
 * @param timestampAdjuster Adjuster corresponding to the provided discontinuity sequence number.
 * @param previousChunk The {@link HlsMediaChunk} that preceded this one. May be null.
 * @param encryptionKey For AES encryption chunks, the encryption key.
 * @param encryptionIv For AES encryption chunks, the encryption initialization vector.
 */
public HlsMediaChunk(DataSource dataSource, DataSpec dataSpec, DataSpec initDataSpec,
    HlsUrl hlsUrl, List<Format> muxedCaptionFormats, int trackSelectionReason,
    Object trackSelectionData, long startTimeUs, long endTimeUs, int chunkIndex,
    int discontinuitySequenceNumber, boolean isMasterTimestampSource,
    TimestampAdjuster timestampAdjuster, HlsMediaChunk previousChunk, byte[] encryptionKey,
    byte[] encryptionIv) {
  super(buildDataSource(dataSource, encryptionKey, encryptionIv), dataSpec, hlsUrl.format,
      trackSelectionReason, trackSelectionData, startTimeUs, endTimeUs, chunkIndex);
  this.discontinuitySequenceNumber = discontinuitySequenceNumber;
  this.initDataSpec = initDataSpec;
  this.hlsUrl = hlsUrl;
  this.muxedCaptionFormats = muxedCaptionFormats;
  this.isMasterTimestampSource = isMasterTimestampSource;
  this.timestampAdjuster = timestampAdjuster;
  // Note: this.dataSource and dataSource may be different.
  this.isEncrypted = this.dataSource instanceof Aes128DataSource;
  lastPathSegment = dataSpec.uri.getLastPathSegment();
  isPackedAudio = lastPathSegment.endsWith(AAC_FILE_EXTENSION)
      || lastPathSegment.endsWith(AC3_FILE_EXTENSION)
      || lastPathSegment.endsWith(EC3_FILE_EXTENSION)
      || lastPathSegment.endsWith(MP3_FILE_EXTENSION);
  if (previousChunk != null) {
    id3Decoder = previousChunk.id3Decoder;
    id3Data = previousChunk.id3Data;
    previousExtractor = previousChunk.extractor;
    shouldSpliceIn = previousChunk.hlsUrl != hlsUrl;
    needNewExtractor = previousChunk.discontinuitySequenceNumber != discontinuitySequenceNumber
        || shouldSpliceIn;
  } else {
    id3Decoder = isPackedAudio ? new Id3Decoder() : null;
    id3Data = isPackedAudio ? new ParsableByteArray(Id3Decoder.ID3_HEADER_LENGTH) : null;
    previousExtractor = null;
    shouldSpliceIn = false;
    needNewExtractor = true;
  }
  initDataSource = dataSource;
  uid = UID_SOURCE.getAndIncrement();
}
 

/**
 * Peeks ID3 data from the input and parses the first ID3 tag.
 *
 * @param input The {@link ExtractorInput} from which data should be peeked.
 * @param id3FramePredicate Determines which ID3 frames are decoded. May be null to decode all
 *     frames.
 * @return The first ID3 tag decoded into a {@link Metadata} object. May be null if ID3 tag is not
 *     present in the input.
 * @throws IOException If an error occurred peeking from the input.
 * @throws InterruptedException If the thread was interrupted.
 */
@Nullable
public Metadata peekId3Data(
    ExtractorInput input, @Nullable Id3Decoder.FramePredicate id3FramePredicate)
    throws IOException, InterruptedException {
  int peekedId3Bytes = 0;
  Metadata metadata = null;
  while (true) {
    try {
      input.peekFully(scratch.data, 0, Id3Decoder.ID3_HEADER_LENGTH);
    } catch (EOFException e) {
      // If input has less than ID3_HEADER_LENGTH, ignore the rest.
      break;
    }
    scratch.setPosition(0);
    if (scratch.readUnsignedInt24() != Id3Decoder.ID3_TAG) {
      // Not an ID3 tag.
      break;
    }
    scratch.skipBytes(3); // Skip major version, minor version and flags.
    int framesLength = scratch.readSynchSafeInt();
    int tagLength = Id3Decoder.ID3_HEADER_LENGTH + framesLength;

    if (metadata == null) {
      byte[] id3Data = new byte[tagLength];
      System.arraycopy(scratch.data, 0, id3Data, 0, Id3Decoder.ID3_HEADER_LENGTH);
      input.peekFully(id3Data, Id3Decoder.ID3_HEADER_LENGTH, framesLength);

      metadata = new Id3Decoder(id3FramePredicate).decode(id3Data, tagLength);
    } else {
      input.advancePeekPosition(framesLength);
    }

    peekedId3Bytes += tagLength;
  }

  input.resetPeekPosition();
  input.advancePeekPosition(peekedId3Bytes);
  return metadata;
}
 

/**
 * Peeks ID3 data from the input and parses the first ID3 tag.
 *
 * @param input The {@link ExtractorInput} from which data should be peeked.
 * @param id3FramePredicate Determines which ID3 frames are decoded. May be null to decode all
 *     frames.
 * @return The first ID3 tag decoded into a {@link Metadata} object. May be null if ID3 tag is not
 *     present in the input.
 * @throws IOException If an error occurred peeking from the input.
 * @throws InterruptedException If the thread was interrupted.
 */
@Nullable
public Metadata peekId3Data(
    ExtractorInput input, @Nullable Id3Decoder.FramePredicate id3FramePredicate)
    throws IOException, InterruptedException {
  int peekedId3Bytes = 0;
  Metadata metadata = null;
  while (true) {
    try {
      input.peekFully(scratch.data, 0, Id3Decoder.ID3_HEADER_LENGTH);
    } catch (EOFException e) {
      // If input has less than ID3_HEADER_LENGTH, ignore the rest.
      break;
    }
    scratch.setPosition(0);
    if (scratch.readUnsignedInt24() != Id3Decoder.ID3_TAG) {
      // Not an ID3 tag.
      break;
    }
    scratch.skipBytes(3); // Skip major version, minor version and flags.
    int framesLength = scratch.readSynchSafeInt();
    int tagLength = Id3Decoder.ID3_HEADER_LENGTH + framesLength;

    if (metadata == null) {
      byte[] id3Data = new byte[tagLength];
      System.arraycopy(scratch.data, 0, id3Data, 0, Id3Decoder.ID3_HEADER_LENGTH);
      input.peekFully(id3Data, Id3Decoder.ID3_HEADER_LENGTH, framesLength);

      metadata = new Id3Decoder(id3FramePredicate).decode(id3Data, tagLength);
    } else {
      input.advancePeekPosition(framesLength);
    }

    peekedId3Bytes += tagLength;
  }

  input.resetPeekPosition();
  input.advancePeekPosition(peekedId3Bytes);
  return metadata;
}
 

public Id3Peeker() {
  scratch = new ParsableByteArray(Id3Decoder.ID3_HEADER_LENGTH);
}
 

public Id3Peeker() {
  scratch = new ParsableByteArray(Id3Decoder.ID3_HEADER_LENGTH);
}
 

public Id3Peeker() {
  scratch = new ParsableByteArray(Id3Decoder.ID3_HEADER_LENGTH);
}
 

public Id3Peeker() {
  scratch = new ParsableByteArray(Id3Decoder.ID3_HEADER_LENGTH);
}
 

public Id3Peeker() {
  scratch = new ParsableByteArray(Id3Decoder.ID3_HEADER_LENGTH);
}