VideoSampleEntry.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;

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

public class VideoSampleEntry extends SampleEntry {

	private int width, height;
	private double horizontalResolution, verticalResolution;
	private int frameCount, depth;
	private String compressorName;

	public VideoSampleEntry(String name) {
		super(name);
	}

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

		in.skipBytes(2); //pre-defined: 0
		in.skipBytes(2); //reserved
		//3x32 pre_defined
		in.skipBytes(4); //pre-defined: 0
		in.skipBytes(4); //pre-defined: 0
		in.skipBytes(4); //pre-defined: 0

		width = (int) in.readBytes(2);
		height = (int) in.readBytes(2);
		horizontalResolution = in.readFixedPoint(16, 16);
		verticalResolution = in.readFixedPoint(16, 16);
		in.skipBytes(4); //reserved
		frameCount = (int) in.readBytes(2);

		final int len = in.read();
		compressorName = in.readString(len);
		in.skipBytes(31-len);

		depth = (int) in.readBytes(2);
		in.skipBytes(2); //pre-defined: -1

		readChildren(in);
	}

	/**
	 * The width is the maximum visual width of the stream described by this
	 * sample description, in pixels.
	 */
	public int getWidth() {
		return width;
	}

	/**
	 * The height is the maximum visual height of the stream described by this
	 * sample description, in pixels.
	 */
	public int getHeight() {
		return height;
	}

	/**
	 * The horizontal resolution of the image in pixels-per-inch, as a floating
	 * point value.
	 */
	public double getHorizontalResolution() {
		return horizontalResolution;
	}

	/**
	 * The vertical resolution of the image in pixels-per-inch, as a floating
	 * point value.
	 */
	public double getVerticalResolution() {
		return verticalResolution;
	}

	/**
	 * The frame count indicates how many frames of compressed video are stored 
	 * in each sample.
	 */
	public int getFrameCount() {
		return frameCount;
	}

	/**
	 * The compressor name, for informative purposes.
	 */
	public String getCompressorName() {
		return compressorName;
	}

	/**
	 * The depth takes one of the following values
	 * DEFAULT_DEPTH (0x18) – images are in colour with no alpha
	 */
	public int getDepth() {
		return depth;
	}
}