public static byte[] parseChildNalUnit(ParsableByteArray parsablebytearray)
{
int i = parsablebytearray.readUnsignedShort();
int j = parsablebytearray.getPosition();
parsablebytearray.skipBytes(i);
return CodecSpecificDataUtil.buildNalUnit(parsablebytearray.data, j, i);
}
/**
* Returns the AC-3 format given {@code data} containing the AC3SpecificBox according to ETSI TS
* 102 366 Annex F.
*/
public static MediaFormat parseAnnexFAc3Format(ParsableByteArray data) {
// fscod (sample rate code)
int fscod = (data.readUnsignedByte() & 0xC0) >> 6;
int sampleRate = SAMPLE_RATES[fscod];
int nextByte = data.readUnsignedByte();
// Map acmod (audio coding mode) onto a channel count.
int channelCount = CHANNEL_COUNTS[(nextByte & 0x38) >> 3];
// lfeon (low frequency effects on)
if ((nextByte & 0x04) != 0) {
channelCount++;
}
return MediaFormat.createAudioFormat(
MimeTypes.AUDIO_AC3, MediaFormat.NO_VALUE, channelCount, sampleRate, null);
}
/**
* Returns the AC-3 format given {@code data} containing the EC3SpecificBox according to ETSI TS
* 102 366 Annex F.
*/
public static MediaFormat parseAnnexFEAc3Format(ParsableByteArray data) {
data.skipBytes(2); // Skip data_rate and num_ind_sub.
// Read only the first substream.
// TODO: Read later substreams?
// fscod (sample rate code)
int fscod = (data.readUnsignedByte() & 0xC0) >> 6;
int sampleRate = SAMPLE_RATES[fscod];
int nextByte = data.readUnsignedByte();
// Map acmod (audio coding mode) onto a channel count.
int channelCount = CHANNEL_COUNTS[(nextByte & 0x0E) >> 1];
// lfeon (low frequency effects on)
if ((nextByte & 0x01) != 0) {
channelCount++;
}
return MediaFormat.createAudioFormat(
MimeTypes.AUDIO_EC3, MediaFormat.NO_VALUE, channelCount, sampleRate, null);
}
