TrackFragmentRunBox.java

/*
 *  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.FullBox;

/**
 * Within the Track Fragment Box, there are zero or more Track Run Boxes. If the
 * duration-is-empty flag is set in the track fragment box, there are no track
 * runs. A track run documents a contiguous set of samples for a track.
 *
 * If the data-offset is not present, then the data for this run starts
 * immediately after the data of the previous run, or at the base-data-offset
 * defined by the track fragment header if this is the first run in a track
 * fragment.
 * If the data-offset is present, it is relative to the base-data-offset
 * established in the track fragment header.
 * 
 * @author in-somnia
 */
public class TrackFragmentRunBox extends FullBox {

	private int sampleCount;
	private boolean dataOffsetPresent, firstSampleFlagsPresent;
	private long dataOffset, firstSampleFlags;
	private boolean sampleDurationPresent, sampleSizePresent, sampleFlagsPresent,
			sampleCompositionTimeOffsetPresent;
	private long[] sampleDuration, sampleSize, sampleFlags, sampleCompositionTimeOffset;

	public TrackFragmentRunBox() {
		super("Track Fragment Run Box");
	}

	@Override
	public void decode(MP4InputStream in) throws IOException {
		super.decode(in);

		sampleCount = (int) in.readBytes(4);

		//optional fields
		dataOffsetPresent = ((flags&1)==1);
		if(dataOffsetPresent) dataOffset = in.readBytes(4);

		firstSampleFlagsPresent = ((flags&4)==4);
		if(firstSampleFlagsPresent) firstSampleFlags = in.readBytes(4);

		//all fields are optional
		sampleDurationPresent = ((flags&0x100)==0x100);
		if(sampleDurationPresent) sampleDuration = new long[sampleCount];
		sampleSizePresent = ((flags&0x200)==0x200);
		if(sampleSizePresent) sampleSize = new long[sampleCount];
		sampleFlagsPresent = ((flags&0x400)==0x400);
		if(sampleFlagsPresent) sampleFlags = new long[sampleCount];
		sampleCompositionTimeOffsetPresent = ((flags&0x800)==0x800);
		if(sampleCompositionTimeOffsetPresent) sampleCompositionTimeOffset = new long[sampleCount];

		for(int i = 0; i<sampleCount&&getLeft(in)>0; i++) {
			if(sampleDurationPresent) sampleDuration[i] = in.readBytes(4);
			if(sampleSizePresent) sampleSize[i] = in.readBytes(4);
			if(sampleFlagsPresent) sampleFlags[i] = in.readBytes(4);
			if(sampleCompositionTimeOffsetPresent) sampleCompositionTimeOffset[i] = in.readBytes(4);
		}
	}

	public int getSampleCount() {
		return sampleCount;
	}

	public boolean isDataOffsetPresent() {
		return dataOffsetPresent;
	}

	public long getDataOffset() {
		return dataOffset;
	}

	public boolean isFirstSampleFlagsPresent() {
		return firstSampleFlagsPresent;
	}

	public long getFirstSampleFlags() {
		return firstSampleFlags;
	}

	public boolean isSampleDurationPresent() {
		return sampleDurationPresent;
	}

	public long[] getSampleDuration() {
		return sampleDuration;
	}

	public boolean isSampleSizePresent() {
		return sampleSizePresent;
	}

	public long[] getSampleSize() {
		return sampleSize;
	}

	public boolean isSampleFlagsPresent() {
		return sampleFlagsPresent;
	}

	public long[] getSampleFlags() {
		return sampleFlags;
	}

	public boolean isSampleCompositionTimeOffsetPresent() {
		return sampleCompositionTimeOffsetPresent;
	}

	public long[] getSampleCompositionTimeOffset() {
		return sampleCompositionTimeOffset;
	}
}