/*
* Copyright (C) 2011 in-somnia
*
* This file is part of JAAD.
*
* JAAD is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* JAAD is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library.
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.sourceforge.jaad.mp4.boxes.impl;
import java.io.IOException;
import net.sourceforge.jaad.mp4.MP4InputStream;
import net.sourceforge.jaad.mp4.boxes.BoxTypes;
import net.sourceforge.jaad.mp4.boxes.FullBox;
/**
* This box contains the sample dependencies for each switching sample. The
* dependencies are stored in the table, one record for each sample. The size of
* the table is taken from the the Sample Size Box ('stsz') or Compact Sample
* Size Box ('stz2').
*
* @author in-somnia
*/
public class SampleDependencyBox extends FullBox {
private int[] dependencyCount;
private int[][] relativeSampleNumber;
public SampleDependencyBox() {
super("Sample Dependency Box");
}
@Override
public void decode(MP4InputStream in) throws IOException {
super.decode(in);
final int sampleCount = ((SampleSizeBox) parent.getChild(BoxTypes.SAMPLE_SIZE_BOX)).getSampleCount();
int j;
for(int i = 0; i<sampleCount; i++) {
dependencyCount[i] = (int) in.readBytes(2);
for(j = 0; j<dependencyCount[i]; j++) {
relativeSampleNumber[i][j] = (int) in.readBytes(2);
}
}
}
/**
* The dependency count is an integer that counts the number of samples
* in the source track on which this switching sample directly depends.
*
* @return all dependency counts
*/
public int[] getDependencyCount() {
return dependencyCount;
}
/**
* The relative sample number is an integer that identifies a sample in
* the source track. The relative sample numbers are encoded as follows.
* If there is a sample in the source track with the same decoding time,
* it has a relative sample number of 0. Whether or not this sample
* exists, the sample in the source track which immediately precedes the
* decoding time of the switching sample has relative sample number –1,
* the sample before that –2, and so on. Similarly, the sample in the
* source track which immediately follows the decoding time of the
* switching sample has relative sample number +1, the sample after that
* +2, and so on.
*
* @return all relative sample numbers
*/
public int[][] getRelativeSampleNumber() {
return relativeSampleNumber;
}
}