private void parse(InputStream fin) throws IOException {
inputStream = fin;
bitRateAndFrameSizeTable = new int[19][2][3][2];
stts = new LinkedList<TimeToSampleBox.Entry>();
initBitRateAndFrameSizeTable();
if (!readVariables()) {
throw new IOException();
}
sampleDescriptionBox = new SampleDescriptionBox();
AudioSampleEntry audioSampleEntry = new AudioSampleEntry("ac-3");
audioSampleEntry.setChannelCount(2); // According to ETSI TS 102 366 Annex F
audioSampleEntry.setSampleRate(samplerate);
audioSampleEntry.setDataReferenceIndex(1);
audioSampleEntry.setSampleSize(16);
AC3SpecificBox ac3 = new AC3SpecificBox();
ac3.setAcmod(acmod);
ac3.setBitRateCode(frmsizecod >> 1);
ac3.setBsid(bsid);
ac3.setBsmod(bsmod);
ac3.setFscod(fscod);
ac3.setLfeon(lfeon);
ac3.setReserved(0);
audioSampleEntry.addBox(ac3);
sampleDescriptionBox.addBox(audioSampleEntry);
trackMetaData.setCreationTime(new Date());
trackMetaData.setModificationTime(new Date());
trackMetaData.setLanguage(lang);
trackMetaData.setTimescale(samplerate); // Audio tracks always use samplerate as timescale
samples = new LinkedList<ByteBuffer>();
if (!readSamples()) {
throw new IOException();
}
}
/**
* Gets an array of sample numbers that are meant to be the first sample of each chunk or
* fragment.
*
* @param track concerned track
* @param movie the context of the track
* @return an array containing the ordinal of each fragment's first sample
*/
public long[] sampleNumbers(Track track, Movie movie) {
if ("vide".equals(track.getHandler())) {
if (track.getSyncSamples() != null && track.getSyncSamples().length > 0) {
List<long[]> times = getSyncSamplesTimestamps(movie, track);
return getCommonIndices(
track.getSyncSamples(),
getTimes(movie, track),
times.toArray(new long[times.size()][]));
} else {
throw new RuntimeException(
"Video Tracks need sync samples. Only tracks other than video may have no sync samples.");
}
} else if ("soun".equals(track.getHandler())) {
Track referenceTrack = null;
for (Track candidate : movie.getTracks()) {
if (candidate.getSyncSamples() != null
&& "vide".equals(candidate.getHandler())
&& candidate.getSyncSamples().length > 0) {
referenceTrack = candidate;
}
}
if (referenceTrack != null) {
// Gets the reference track's fra
long[] refSyncSamples = sampleNumbers(referenceTrack, movie);
int refSampleCount = referenceTrack.getSamples().size();
long[] syncSamples = new long[refSyncSamples.length];
long minSampleRate = 192000;
for (Track testTrack : movie.getTracks()) {
if ("soun".equals(testTrack.getHandler())) {
AudioSampleEntry ase =
(AudioSampleEntry) testTrack.getSampleDescriptionBox().getSampleEntry();
if (ase.getSampleRate() < minSampleRate) {
minSampleRate = ase.getSampleRate();
long sc = testTrack.getSamples().size();
double stretch = (double) sc / refSampleCount;
for (int i = 0; i < syncSamples.length; i++) {
int start = (int) Math.ceil(stretch * (refSyncSamples[i] - 1)) + 1;
syncSamples[i] = start;
// The Stretch makes sure that there are as much audio and video chunks!
}
}
}
}
AudioSampleEntry ase = (AudioSampleEntry) track.getSampleDescriptionBox().getSampleEntry();
double factor = (double) ase.getSampleRate() / (double) minSampleRate;
if (factor != Math.rint(factor)) { // Not an integer
throw new RuntimeException(
"Sample rates must be a multiple of the lowest sample rate to create a correct file!");
}
for (int i = 1; i < syncSamples.length; i++) {
syncSamples[i] = (int) (1 + (syncSamples[i] - 1) * factor);
}
return syncSamples;
}
throw new RuntimeException(
"There was absolutely no Track with sync samples. I can't work with that!");
} else {
// Ok, my track has no sync samples - let's find one with sync samples.
for (Track candidate : movie.getTracks()) {
if (candidate.getSyncSamples() != null && candidate.getSyncSamples().length > 0) {
long[] refSyncSamples = sampleNumbers(candidate, movie);
int refSampleCount = candidate.getSamples().size();
long[] syncSamples = new long[refSyncSamples.length];
long sc = track.getSamples().size();
double stretch = (double) sc / refSampleCount;
for (int i = 0; i < syncSamples.length; i++) {
int start = (int) Math.ceil(stretch * (refSyncSamples[i] - 1)) + 1;
syncSamples[i] = start;
// The Stretch makes sure that there are as much audio and video chunks!
}
return syncSamples;
}
}
throw new RuntimeException(
"There was absolutely no Track with sync samples. I can't work with that!");
}
}
