/*
* Copyright (c) 2008, 2009, 2010, 2011 Denis Tulskiy
*
* This program 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.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with this work. If not, see <http://www.gnu.org/licenses/>.
*/
package com.tulskiy.musique.audio.formats.wavpack;
import com.tulskiy.musique.audio.Decoder;
import com.tulskiy.musique.playlist.Track;
import com.wavpack.decoder.Defines;
import com.wavpack.decoder.WavPackUtils;
import com.wavpack.decoder.WavpackContext;
import javax.sound.sampled.AudioFormat;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
* @Author: Denis Tulskiy
* @Date: 01.07.2009
*/
public class WavPackDecoder implements Decoder {
private static final int BUFFER_SIZE = Defines.SAMPLE_BUFFER_SIZE;
private AudioFormat audioFormat;
private WavpackContext wpc;
private int[] buffer = new int[BUFFER_SIZE];
private int channels;
private int bps;
private RandomAccessFile ras;
public boolean open(Track track) {
try {
logger.fine("Opening file: " + track.getTrackData().getFile());
ras = new RandomAccessFile(track.getTrackData().getFile(), "r");
wpc = WavPackUtils.WavpackOpenFileInput(ras);
if (wpc.isError()) {
logger.warning("WavPack error: " + wpc.getErrorMessage());
close();
return false;
}
channels = WavPackUtils.WavpackGetReducedChannels(wpc);
bps = WavPackUtils.WavpackGetBitsPerSample(wpc);
long samplerate = WavPackUtils.WavpackGetSampleRate(wpc);
audioFormat = new AudioFormat(samplerate, bps, channels, true, false);
return true;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return false;
}
public AudioFormat getAudioFormat() {
return audioFormat;
}
public void seekSample(long sample) {
WavPackUtils.setSample(wpc, sample);
}
public int decode(byte[] buf) {
int samplesUnpacked = (int) WavPackUtils.WavpackUnpackSamples(wpc, buffer, BUFFER_SIZE / channels);
if (samplesUnpacked <= 0) return -1;
samplesUnpacked *= channels;
format_samples(samplesUnpacked, buf);
return samplesUnpacked * bps / 8;
}
public void close() {
try {
if (ras != null)
ras.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private void format_samples(long samcnt, byte[] buf) {
int temp;
int counter = 0;
int counter2 = 0;
int bytesPerSample = bps / 8;
switch (bytesPerSample) {
case 1:
while (samcnt > 0) {
buf[counter] = (byte) (0x00FF & (buffer[counter] + 128));
counter++;
samcnt--;
}
break;
case 2:
while (samcnt > 0) {
temp = buffer[counter2];
buf[counter] = (byte) temp;
counter++;
buf[counter] = (byte) (temp >>> 8);
counter++;
counter2++;
samcnt--;
}
break;
case 3:
while (samcnt > 0) {
temp = buffer[counter2];
buf[counter] = (byte) temp;
counter++;
buf[counter] = (byte) (temp >>> 8);
counter++;
buf[counter] = (byte) (temp >>> 16);
counter++;
counter2++;
samcnt--;
}
break;
case 4:
while (samcnt > 0) {
temp = buffer[counter2];
buf[counter] = (byte) temp;
counter++;
buf[counter] = (byte) (temp >>> 8);
counter++;
buf[counter] = (byte) (temp >>> 16);
counter++;
buf[counter] = (byte) (temp >>> 24);
counter++;
counter2++;
samcnt--;
}
break;
}
}
}