/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.backends.lwjgl.audio;
import java.io.ByteArrayOutputStream;
import javazoom.jl.decoder.Bitstream;
import javazoom.jl.decoder.BitstreamException;
import javazoom.jl.decoder.Header;
import javazoom.jl.decoder.MP3Decoder;
import javazoom.jl.decoder.OutputBuffer;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.utils.GdxRuntimeException;
/** @author Nathan Sweet */
public class Mp3 {
static public class Music extends OpenALMusic {
// Note: This uses a slightly modified version of JLayer.
private Bitstream bitstream;
private OutputBuffer outputBuffer;
private MP3Decoder decoder;
public Music (OpenALAudio audio, FileHandle file) {
super(audio, file);
if (audio.noDevice) return;
bitstream = new Bitstream(file.read());
decoder = new MP3Decoder();
try {
Header header = bitstream.readFrame();
if (header == null) throw new GdxRuntimeException("empty ogg");
int channels = header.mode() == Header.SINGLE_CHANNEL ? 1 : 2;
outputBuffer = new OutputBuffer(channels, false);
decoder.setOutputBuffer(outputBuffer);
setup(channels, header.getSampleRate());
} catch (BitstreamException e) {
throw new GdxRuntimeException("error while preloading mp3", e);
}
}
public int read (byte[] buffer) {
try {
boolean setup = bitstream == null;
if (setup) {
bitstream = new Bitstream(file.read());
decoder = new MP3Decoder();
}
int totalLength = 0;
int minRequiredLength = buffer.length - OutputBuffer.BUFFERSIZE * 2;
while (totalLength <= minRequiredLength) {
Header header = bitstream.readFrame();
if (header == null) break;
if (setup) {
int channels = header.mode() == Header.SINGLE_CHANNEL ? 1 : 2;
outputBuffer = new OutputBuffer(channels, false);
decoder.setOutputBuffer(outputBuffer);
setup(channels, header.getSampleRate());
setup = false;
}
try {
decoder.decodeFrame(header, bitstream);
} catch (Exception ignored) {
// JLayer's decoder throws ArrayIndexOutOfBoundsException sometimes!?
}
bitstream.closeFrame();
int length = outputBuffer.reset();
System.arraycopy(outputBuffer.getBuffer(), 0, buffer, totalLength, length);
totalLength += length;
}
return totalLength;
} catch (Throwable ex) {
reset();
throw new GdxRuntimeException("Error reading audio data.", ex);
}
}
public void reset () {
if (bitstream == null) return;
try {
bitstream.close();
} catch (BitstreamException ignored) {
}
bitstream = null;
}
}
static public class Sound extends OpenALSound {
// Note: This uses a slightly modified version of JLayer.
public Sound (OpenALAudio audio, FileHandle file) {
super(audio);
if (audio.noDevice) return;
ByteArrayOutputStream output = new ByteArrayOutputStream(4096);
Bitstream bitstream = new Bitstream(file.read());
MP3Decoder decoder = new MP3Decoder();
try {
OutputBuffer outputBuffer = null;
int sampleRate = -1, channels = -1;
while (true) {
Header header = bitstream.readFrame();
if (header == null) break;
if (outputBuffer == null) {
channels = header.mode() == Header.SINGLE_CHANNEL ? 1 : 2;
outputBuffer = new OutputBuffer(channels, false);
decoder.setOutputBuffer(outputBuffer);
sampleRate = header.getSampleRate();
}
try {
decoder.decodeFrame(header, bitstream);
} catch (Exception ignored) {
// JLayer's decoder throws ArrayIndexOutOfBoundsException sometimes!?
}
bitstream.closeFrame();
output.write(outputBuffer.getBuffer(), 0, outputBuffer.reset());
}
bitstream.close();
setup(output.toByteArray(), channels, sampleRate);
} catch (Throwable ex) {
throw new GdxRuntimeException("Error reading audio data.", ex);
}
}
}
}