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package jogamp.opengl.openal.av;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.lang.InterruptedException;
import jogamp.opengl.util.av.AudioSink;
import com.jogamp.common.nio.Buffers;
import com.jogamp.openal.*;
public class ALAudioSink implements AudioSink {
static ALC alc;
static AL al;
static ALCdevice device;
static ALCcontext context;
// AudioFormat parameters
public static final int SAMPLE_RATE = 44100;
// Chunk of audio processed at one time
public static final int BUFFER_SIZE = 1000;
public static final int SAMPLES_PER_BUFFER = BUFFER_SIZE / 2;
// Sample time values
public static final double SAMPLE_TIME_IN_SECS = 1.0 / SAMPLE_RATE;
public static final double BUFFER_TIME_IN_SECS = SAMPLE_TIME_IN_SECS * SAMPLES_PER_BUFFER;
private static int NUM_BUFFERS = 5;
private static int bufferNumber = 0;
private static int[] buffers = new int[NUM_BUFFERS];
private static int[] source = new int[1];
private static boolean initBuffer = true;
private static int frequency = 44100;
private static int format = AL.AL_FORMAT_STEREO16;
private static boolean available = false;
static {
boolean joalFound = false;
try {
Class.forName("com.jogamp.openal.ALFactory");
joalFound = true;
} catch(ClassNotFoundException e){
// Joal not found on classpath
}
if(joalFound) {
alc = ALFactory.getALC();
String deviceSpecifier;
// Get handle to default device.
device = alc.alcOpenDevice(null);
if (device == null) {
throw new ALException("Error opening default OpenAL device");
}
// Get the device specifier.
deviceSpecifier = alc.alcGetString(device, ALC.ALC_DEVICE_SPECIFIER);
if (deviceSpecifier == null) {
throw new ALException("Error getting specifier for default OpenAL device");
}
// Create audio context.
context = alc.alcCreateContext(device, null);
if (context == null) {
throw new ALException("Error creating OpenAL context");
}
// Set active context.
alc.alcMakeContextCurrent(context);
// Check for an error.
if (alc.alcGetError(device) != ALC.ALC_NO_ERROR) {
throw new ALException("Error making OpenAL context current");
}
al = ALFactory.getAL();
// Allocate buffers
al.alGenBuffers(NUM_BUFFERS, buffers, 0);
al.alGenSources(1, source, 0);
if(al.alGetError() != AL.AL_NO_ERROR) {
throw new ALException("Error generating :(");
}
System.out.println("OpenAL audio sink using device: " + deviceSpecifier);
available = true;
}
}
@Override
public boolean isDataAvailable(int data_size) {
return true;
}
@Override
public void writeData(byte[] sampleData, int data_size) {
// OpenAL consumes buffers in the background
// we first need to initialize the OpenAL buffers then
// start continous playback.
alc.alcMakeContextCurrent(context);
if(initBuffer) {
ByteBuffer data = Buffers.newDirectByteBuffer(sampleData);
al.alBufferData(buffers[bufferNumber], format, data, data_size, frequency);
int error = al.alGetError();
if(error != AL.AL_NO_ERROR) {
System.out.println("bufferNumber"+bufferNumber+" Data "+sampleData+" size"+data_size);
throw new ALException("Error loading :( error code: " + error);
}
if(bufferNumber==NUM_BUFFERS-1){
// all buffers queued
al.alSourceQueueBuffers(source[0], NUM_BUFFERS, buffers, 0);
// start playback
al.alSourcePlay(source[0]);
if(al.alGetError() != AL.AL_NO_ERROR) {
throw new ALException("Error starting :(");
}
initBuffer=false;
}
// update buffer number to fill
bufferNumber=(bufferNumber+1)%NUM_BUFFERS;
} else {
// OpenAL is playing in the background.
// one new frame with audio data is ready
// first wait for openal to release one buffer
int[] buffer=new int[1];
int[] val=new int[1];
do {
al.alGetSourcei(source[0], AL.AL_BUFFERS_PROCESSED, val, 0);
if(val[0] <= 0){
try {
Thread.sleep(1);
} catch (InterruptedException e){
}
}
} while (val[0] <= 0);
// fill and requeue the empty buffer
al.alSourceUnqueueBuffers(source[0], 1, buffer , 0);
Buffer data = Buffers.newDirectByteBuffer(sampleData);
al.alBufferData(buffer[0], format, data, data_size, frequency);
al.alSourceQueueBuffers(source[0], 1, buffer, 0);
if(al.alGetError() != AL.AL_NO_ERROR) {
throw new ALException("Error buffering :(");
}
// Restart openal playback if needed
al.alGetSourcei(source[0], AL.AL_SOURCE_STATE, val, 0);
if(val[0] != al.AL_PLAYING) {
al.alSourcePlay(source[0]);
}
}
}
@Override
public int getDataAvailable() {
int[] val=new int[1];
al.alGetSourcei(source[0], AL.AL_BUFFERS_PROCESSED, val, 0);
return (NUM_BUFFERS-val[0])*4096;
}
@Override
public boolean isAudioSinkAvailable() {
return available;
}
}
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