AVCSpecificBox.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.sampleentries.codec;

import java.io.IOException;
import net.sourceforge.jaad.mp4.MP4InputStream;

//defined in ISO 14496-15 as 'AVC Configuration Record'
public class AVCSpecificBox extends CodecSpecificBox {

	private int configurationVersion, profile, level, lengthSize;
	private byte profileCompatibility;
	private byte[][] sequenceParameterSetNALUnit, pictureParameterSetNALUnit;

	public AVCSpecificBox() {
		super("AVC Specific Box");
	}

	@Override
	public void decode(MP4InputStream in) throws IOException {
		configurationVersion = in.read();
		profile = in.read();
		profileCompatibility = (byte) in.read();
		level = in.read();
		//6 bits reserved, 2 bits 'length size minus one'
		lengthSize = (in.read()&3)+1;

		int len;
		//3 bits reserved, 5 bits number of sequence parameter sets
		final int sequenceParameterSets = in.read()&31;

		sequenceParameterSetNALUnit = new byte[sequenceParameterSets][];
		for(int i = 0; i<sequenceParameterSets; i++) {
			len = (int) in.readBytes(2);
			sequenceParameterSetNALUnit[i] = new byte[len];
			in.readBytes(sequenceParameterSetNALUnit[i]);
		}

		final int pictureParameterSets = in.read();

		pictureParameterSetNALUnit = new byte[pictureParameterSets][];
		for(int i = 0; i<pictureParameterSets; i++) {
			len = (int) in.readBytes(2);
			pictureParameterSetNALUnit[i] = new byte[len];
			in.readBytes(pictureParameterSetNALUnit[i]);
		}
	}

	public int getConfigurationVersion() {
		return configurationVersion;
	}

	/**
	 * The AVC profile code as defined in ISO/IEC 14496-10.
	 *
	 * @return the AVC profile
	 */
	public int getProfile() {
		return profile;
	}

	/**
	 * The profileCompatibility is a byte defined exactly the same as the byte
	 * which occurs between the profileIDC and levelIDC in a sequence parameter
	 * set (SPS), as defined in ISO/IEC 14496-10.
	 *
	 * @return the profile compatibility byte
	 */
	public byte getProfileCompatibility() {
		return profileCompatibility;
	}

	public int getLevel() {
		return level;
	}

	/**
	 * The length in bytes of the NALUnitLength field in an AVC video sample or
	 * AVC parameter set sample of the associated stream. The value of this
	 * field 1, 2, or 4 bytes.
	 *
	 * @return the NALUnitLength length in bytes
	 */
	public int getLengthSize() {
		return lengthSize;
	}

	/**
	 * The SPS NAL units, as specified in ISO/IEC 14496-10. SPSs shall occur in
	 * order of ascending parameter set identifier with gaps being allowed.
	 *
	 * @return all SPS NAL units
	 */
	public byte[][] getSequenceParameterSetNALUnits() {
		return sequenceParameterSetNALUnit;
	}

	/**
	 * The PPS NAL units, as specified in ISO/IEC 14496-10. PPSs shall occur in
	 * order of ascending parameter set identifier with gaps being allowed.
	 *
	 * @return all PPS NAL units
	 */
	public byte[][] getPictureParameterSetNALUnits() {
		return pictureParameterSetNALUnit;
	}
}