simple shorten example

examples/src/main/java/com/googlecode/mp4parser/SingleTrackShortenExample.java

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+package com.googlecode.mp4parser;
+
+import com.coremedia.iso.boxes.Container;
+import com.googlecode.mp4parser.authoring.Movie;
+import com.googlecode.mp4parser.authoring.Track;
+import com.googlecode.mp4parser.authoring.builder.DefaultMp4Builder;
+import com.googlecode.mp4parser.authoring.container.mp4.MovieCreator;
+import com.googlecode.mp4parser.authoring.tracks.CroppedTrack;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * Shortens/Crops a track
+ */
+public class SingleTrackShortenExample {
+
+
+ public static void main(String[] args) throws IOException {
+ //Movie movie = new MovieCreator().build(new RandomAccessFile("/home/sannies/suckerpunch-distantplanet_h1080p/suckerpunch-distantplanet_h1080p.mov", "r").getChannel());
+ Movie movie = MovieCreator.build("C:\\content\\843D111F-E839-4597-B60C-3B8114E0AA72_ABR05.mp4");
+
+ List<Track> tracks = movie.getTracks();
+ assert tracks.size() == 1;
+ Track track = movie.getTracks().get(0);
+
+ movie.setTracks(new LinkedList<Track>());
+ // remove all tracks we will create new tracks from the old
+
+ double startTime = 10;
+ double endTime = 20;
+
+ long startSample = findNextSyncSample(track, startTime);
+ long endSample = findNextSyncSample(track, endTime);
+
+ movie.addTrack(new CroppedTrack(track, startSample, endSample));
+
+ Container out = new DefaultMp4Builder().build(movie);
+ FileOutputStream fos = new FileOutputStream(String.format("output-%f-%f.mp4", startTime, endTime));
+ FileChannel fc = fos.getChannel();
+ out.writeContainer(fc);
+ fc.close();
+ fos.close();
+ }
+
+
+ private static long findNextSyncSample(Track track, double cutHere) {
+ long currentSample = 0;
+ double currentTime = 0;
+ long[] durations = track.getSampleDurations();
+ long[] syncSamples = track.getSyncSamples();
+ for (int i = 0; i < durations.length; i++) {
+ long delta = durations[i];
+
+ if ((syncSamples == null || syncSamples.length > 0 || Arrays.binarySearch(syncSamples, currentSample + 1) >= 0)
+ && currentTime > cutHere) {
+ return i;
+ }
+ currentTime += (double) delta / (double) track.getTrackMetaData().getTimescale();
+ currentSample++;
+ }
+ return currentSample;
+ }
+
+
+}