Crop audio track about mp4parser HOT 6 CLOSED

String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getAbsolutePath();
String videoPath = path + "/" + "sas-video.mp4";

Movie orig_movie = MovieCreator.build(videoPath);

String filename = "finalaudiolong.aac";
File audioFile = new File(path, filename);

AACTrackImpl aacTrack = new AACTrackImpl(new FileDataSourceImpl(audioFile));

//get duration of video
IsoFile isoFile = new IsoFile(videoPath);
double lengthInSeconds = (double)
        isoFile.getMovieBox().getMovieHeaderBox().getDuration() /
        isoFile.getMovieBox().getMovieHeaderBox().getTimescale();


Track track = (Track) orig_movie.getTracks().get(0);

Track audioTrack = (Track) aacTrack;


double startTime1 = 0;
double endTime1 = lengthInSeconds;

boolean timeCorrected = false;

if (audioTrack.getSyncSamples() != null && audioTrack.getSyncSamples().length > 0) {
    if (timeCorrected) {

        throw new RuntimeException("The startTime has already been corrected by another track with SyncSample. Not Supported.");
    }
    startTime1 = correctTimeToSyncSample(audioTrack, startTime1, false);
    endTime1 = correctTimeToSyncSample(audioTrack, endTime1, true);
    timeCorrected = true;
}

long currentSample = 0;
double currentTime = 0;
double lastTime = -1;
long startSample1 = -1;
long endSample1 = -1;


for (int i = 0; i < audioTrack.getSampleDurations().length; i++) {
    long delta = audioTrack.getSampleDurations()[i];


    if (currentTime > lastTime && currentTime <= startTime1) {
        // current sample is still before the new starttime
        startSample1 = currentSample;
    }
    if (currentTime > lastTime && currentTime <= endTime1) {
        // current sample is after the new start time and still before the new endtime
        endSample1 = currentSample;
    }

    lastTime = currentTime;
    currentTime += (double) delta / (double) audioTrack.getTrackMetaData().getTimescale();
    currentSample++;
}

CroppedTrack cropperAacTrack = new CroppedTrack(aacTrack, startSample1, endSample1);

Movie movie = new Movie();

movie.addTrack(track);
movie.addTrack(cropperAacTrack);

Container mp4file = new DefaultMp4Builder().build(movie);

FileChannel fc = new FileOutputStream(new File(path,"sas-video-with-audio.mp4")).getChannel();
mp4file.writeContainer(fc);
fc.close();