@Override
public void decode(MP4InputStream in) throws IOException {
super.decode(in);
trackID = in.readBytes(4);
// optional fields
baseDataOffsetPresent = ((flags & 1) == 1);
baseDataOffset = baseDataOffsetPresent ? in.readBytes(8) : 0;
sampleDescriptionIndexPresent = ((flags & 2) == 2);
sampleDescriptionIndex = sampleDescriptionIndexPresent ? in.readBytes(4) : 0;
defaultSampleDurationPresent = ((flags & 8) == 8);
defaultSampleDuration = defaultSampleDurationPresent ? in.readBytes(4) : 0;
defaultSampleSizePresent = ((flags & 16) == 16);
defaultSampleSize = defaultSampleSizePresent ? in.readBytes(4) : 0;
defaultSampleFlagsPresent = ((flags & 32) == 32);
defaultSampleFlags = defaultSampleFlagsPresent ? in.readBytes(4) : 0;
durationIsEmpty = ((flags & 0x10000) == 0x10000);
}
