private InterleaveChunkMdat(Movie movie, Map<Track, int[]> chunks, long contentSize) {
this.contentSize = contentSize;
this.tracks = movie.getTracks();
List<Track> tracks = new ArrayList<Track>(chunks.keySet());
Collections.sort(
tracks,
new Comparator<Track>() {
public int compare(Track o1, Track o2) {
return l2i(o1.getTrackMetaData().getTrackId() - o2.getTrackMetaData().getTrackId());
}
});
Map<Track, Integer> trackToChunk = new HashMap<Track, Integer>();
Map<Track, Integer> trackToSample = new HashMap<Track, Integer>();
Map<Track, Double> trackToTime = new HashMap<Track, Double>();
for (Track track : tracks) {
trackToChunk.put(track, 0);
trackToSample.put(track, 0);
trackToTime.put(track, 0.0);
}
while (true) {
Track nextChunksTrack = null;
for (Track track : tracks) {
if ((nextChunksTrack == null || trackToTime.get(track) < trackToTime.get(nextChunksTrack))
&&
// either first OR track's next chunk's starttime is smaller than nextTrack's next
// chunks starttime
// AND their need to be chunks left!
(trackToChunk.get(track) < chunks.get(track).length)) {
nextChunksTrack = track;
}
}
if (nextChunksTrack == null) {
break;
}
// found the next one
int nextChunksIndex = trackToChunk.get(nextChunksTrack);
int numberOfSampleInNextChunk = chunks.get(nextChunksTrack)[nextChunksIndex];
int startSample = trackToSample.get(nextChunksTrack);
double time = trackToTime.get(nextChunksTrack);
for (int j = startSample; j < startSample + numberOfSampleInNextChunk; j++) {
time +=
(double) nextChunksTrack.getSampleDurations()[j]
/ nextChunksTrack.getTrackMetaData().getTimescale();
}
chunkList.add(
nextChunksTrack
.getSamples()
.subList(startSample, startSample + numberOfSampleInNextChunk));
trackToChunk.put(nextChunksTrack, nextChunksIndex + 1);
trackToSample.put(nextChunksTrack, startSample + numberOfSampleInNextChunk);
trackToTime.put(nextChunksTrack, time);
}
}
/**
* Changes the time scale of the source track to the target time scale and makes sure that any
* rounding errors that may have summed are corrected exactly before the syncSamples.
*
* @param source the source track
* @param targetTimeScale the resulting time scale of this track.
* @param syncSamples at these sync points where rounding error are corrected.
*/
public ChangeTimeScaleTrack(Track source, long targetTimeScale, long[] syncSamples) {
this.source = source;
this.timeScale = targetTimeScale;
double timeScaleFactor = (double) targetTimeScale / source.getTrackMetaData().getTimescale();
ctts = adjustCtts(source.getCompositionTimeEntries(), timeScaleFactor);
decodingTimes =
adjustTts(
source.getSampleDurations(),
timeScaleFactor,
syncSamples,
getTimes(source, syncSamples, targetTimeScale));
}
protected void createStts(Track track, SampleTableBox stbl) {
TimeToSampleBox.Entry lastEntry = null;
List<TimeToSampleBox.Entry> entries = new ArrayList<TimeToSampleBox.Entry>();
for (long delta : track.getSampleDurations()) {
if (lastEntry != null && lastEntry.getDelta() == delta) {
lastEntry.setCount(lastEntry.getCount() + 1);
} else {
lastEntry = new TimeToSampleBox.Entry(1, delta);
entries.add(lastEntry);
}
}
TimeToSampleBox stts = new TimeToSampleBox();
stts.setEntries(entries);
stbl.addBox(stts);
}
private static long[] getTimes(Track track, long[] syncSamples, long targetTimeScale) {
long[] syncSampleTimes = new long[syncSamples.length];
int currentSample = 1; // first syncsample is 1
long currentDuration = 0;
int currentSyncSampleIndex = 0;
while (currentSample <= syncSamples[syncSamples.length - 1]) {
if (currentSample == syncSamples[currentSyncSampleIndex]) {
syncSampleTimes[currentSyncSampleIndex++] =
(currentDuration * targetTimeScale) / track.getTrackMetaData().getTimescale();
}
currentDuration += track.getSampleDurations()[currentSample - 1];
currentSample++;
}
return syncSampleTimes;
}
protected void createStco(
Track targetTrack, Movie movie, Map<Track, int[]> chunks, SampleTableBox stbl) {
if (chunkOffsetBoxes.get(targetTrack) == null) {
// The ChunkOffsetBox we create here is just a stub
// since we haven't created the whole structure we can't tell where the
// first chunk starts (mdat box). So I just let the chunk offset
// start at zero and I will add the mdat offset later.
long offset = 0;
// all tracks have the same number of chunks
if (LOG.isLoggable(Level.FINE)) {
LOG.fine(
"Calculating chunk offsets for track_" + targetTrack.getTrackMetaData().getTrackId());
}
List<Track> tracks = new ArrayList<Track>(chunks.keySet());
Collections.sort(
tracks,
new Comparator<Track>() {
public int compare(Track o1, Track o2) {
return l2i(o1.getTrackMetaData().getTrackId() - o2.getTrackMetaData().getTrackId());
}
});
Map<Track, Integer> trackToChunk = new HashMap<Track, Integer>();
Map<Track, Integer> trackToSample = new HashMap<Track, Integer>();
Map<Track, Double> trackToTime = new HashMap<Track, Double>();
for (Track track : tracks) {
trackToChunk.put(track, 0);
trackToSample.put(track, 0);
trackToTime.put(track, 0.0);
chunkOffsetBoxes.put(track, new StaticChunkOffsetBox());
}
while (true) {
Track nextChunksTrack = null;
for (Track track : tracks) {
// This always chooses the least progressed track
if ((nextChunksTrack == null || trackToTime.get(track) < trackToTime.get(nextChunksTrack))
&&
// either first OR track's next chunk's starttime is smaller than nextTrack's next
// chunks starttime
// AND their need to be chunks left!
(trackToChunk.get(track) < chunks.get(track).length)) {
nextChunksTrack = track;
}
}
if (nextChunksTrack == null) {
break; // no next
}
// found the next one
ChunkOffsetBox chunkOffsetBox = chunkOffsetBoxes.get(nextChunksTrack);
chunkOffsetBox.setChunkOffsets(
Mp4Arrays.copyOfAndAppend(chunkOffsetBox.getChunkOffsets(), offset));
int nextChunksIndex = trackToChunk.get(nextChunksTrack);
int numberOfSampleInNextChunk = chunks.get(nextChunksTrack)[nextChunksIndex];
int startSample = trackToSample.get(nextChunksTrack);
double time = trackToTime.get(nextChunksTrack);
for (int j = startSample; j < startSample + numberOfSampleInNextChunk; j++) {
offset += track2SampleSizes.get(nextChunksTrack)[j];
time +=
(double) nextChunksTrack.getSampleDurations()[j]
/ nextChunksTrack.getTrackMetaData().getTimescale();
}
trackToChunk.put(nextChunksTrack, nextChunksIndex + 1);
trackToSample.put(nextChunksTrack, startSample + numberOfSampleInNextChunk);
trackToTime.put(nextChunksTrack, time);
}
}
stbl.addBox(chunkOffsetBoxes.get(targetTrack));
}