VorbisDecoder.java

/*
 *  This file is part of the Haven & Hearth game client.
 *  Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and
 *                     Björn Johannessen <johannessen.bjorn@gmail.com>
 *
 *  Redistribution and/or modification of this file is subject to the
 *  terms of the GNU Lesser General Public License, version 3, as
 *  published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *  Other parts of this source tree adhere to other copying
 *  rights. Please see the file `COPYING' in the root directory of the
 *  source tree for details.
 *
 *  A copy the GNU Lesser General Public License is distributed along
 *  with the source tree of which this file is a part in the file
 *  `doc/LPGL-3'. If it is missing for any reason, please see the Free
 *  Software Foundation's website at <http://www.fsf.org/>, or write
 *  to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *  Boston, MA 02111-1307 USA
 */

package haven;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import dolda.xiphutil.VorbisStream;

/*
 * Not that I'm ungrateful for the work the JCraft has done with
 * writing an Ogg/Vorbis decoder in Java, they really should try and
 * learn some rational API design.
 */
public class VorbisDecoder extends InputStream {
	public VorbisStream in;
	private byte[] buf;
	private int bufp;
	public final int chn, rate;

	public VorbisDecoder(InputStream in) throws IOException {
		this.in = new VorbisStream(in);
		chn = this.in.chn;
		rate = this.in.rate;
	}

	private boolean decode() throws IOException {
		float[][] inb = in.decode();
		if (inb == null) {
			buf = new byte[0];
			return (false);
		}
		buf = new byte[2 * chn * inb[0].length];
		int p = 0;
		for (int i = 0; i < inb[0].length; i++) {
			for (int c = 0; c < chn; c++) {
				int s = (int) (inb[c][i] * 32767);
				buf[p++] = (byte) s;
				buf[p++] = (byte) (s >> 8);
			}
		}
		bufp = 0;
		return (true);
	}

	public int read() throws IOException {
		byte[] rb = new byte[1];
		int ret;
		do {
			ret = read(rb);
			if (ret < 0)
				return (-1);
		} while (ret == 0);
		return (rb[0]);
	}

	public int read(byte[] dst, int off, int len) throws IOException {
		if ((buf == null) && !decode())
			return (-1);
		if (buf.length - bufp < len)
			len = buf.length - bufp;
		System.arraycopy(buf, bufp, dst, off, len);
		if ((bufp += len) == buf.length)
			buf = null;
		return (len);
	}

	public void close() throws IOException {
		in.close();
	}

	public static void main(String[] args) throws Exception {
		InputStream dec = new VorbisDecoder(new FileInputStream(args[0]));
		byte[] buf = new byte[4096];
		int ret;
		while ((ret = dec.read(buf)) >= 0)
			System.out.write(buf, 0, ret);
	}
}