MovieFragmentHeaderBox.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;

/**
 * The movie fragment header contains a sequence number, as a safety check. The
 * sequence number usually starts at 1 and must increase for each movie fragment
 * in the file, in the order in which they occur. This allows readers to verify
 * integrity of the sequence; it is an error to construct a file where the
 * fragments are out of sequence.
 */
public class MovieFragmentHeaderBox extends FullBox {

	private long sequenceNumber;

	public MovieFragmentHeaderBox() {
		super("Movie Fragment Header Box");
	}

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

		sequenceNumber = in.readBytes(4);
	}

	/**
	 * The ordinal number of this fragment, in increasing order.
	 */
	public long getSequenceNumber() {
		return sequenceNumber;
	}
}