just a question i’m messing around with the space invaders demo, trying to understand how openal works, but i’m having problems playing more then one sound at a time if i do try play another sound the sound that is currently running restarts, and new one is not played, i’ve had a look at some of the tutorials but just can’t get it to run, i think it may need a for loop or something in the playSound() method, but not sure any help would, thx
package org.newdawn.spaceinvaders;
import java.nio.IntBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.openal.AL;
import org.lwjgl.openal.AL10;
import org.lwjgl.test.openal.WaveData;
/**
* $Id: SoundManager.java,v 1.1 2004/06/12 19:59:20 matzon Exp $
* <p>
* Simple sound manager for OpenAL using n sources accessed in
* a round robin schedule. Source n is reserved for a single buffer and checking for
* whether it's playing.
* </p>
* @author Brian Matzon <brian@matzon.dk>
* @version $Revision: 1.1 $
*/
public class SoundManager {
/** We support at most 256 buffers*/
private int[] buffers = new int[256];
/** Number of sources is limited tby user (and hardware) */
private int[] sources;
/** Our internal scratch buffer */
private IntBuffer scratchBuffer = BufferUtils.createIntBuffer(256);
/** Whether we're running in no sound mode */
private boolean soundOutput;
/** Current index in our buffers */
private int bufferIndex;
/** Current index in our source list */
private int sourceIndex;
/**
* Creates a new SoundManager
*/
public SoundManager() {
}
/**
* Plays a sound effect
* @param buffer Buffer index to play gotten from addSound
*/
public void playEffect(int buffer) {
if(soundOutput) {
// make sure we never choose last channel, since it is used for special sounds
int channel = sources[(sourceIndex++ % (sources.length-1))];
// link buffer and source, and play it
AL10.alSourcei(channel, AL10.AL_BUFFER, buffers[buffer]);
AL10.alSourcePlay(channel);
}
}
/**
* Plays a sound on last source
* @param buffer Buffer index to play gotten from addSound
*/
public void playSound(int buffer) {
if(soundOutput) {
AL10.alSourcei(sources[sources.length-1], AL10.AL_BUFFER, buffers[buffer]);
AL10.alSourcePlay(sources[sources.length-1]);
}
}
/**
* Whether a sound is playing on last source
* @return true if a source is playing right now on source n
*/
public boolean isPlayingSound() {
return AL10.alGetSourcei(sources[sources.length-1], AL10.AL_SOURCE_STATE) == AL10.AL_PLAYING;
}
/**
* Initializes the SoundManager
*
* @param sources Number of sources to create
*/
public void initialize(int channels) {
try {
AL.create();
// allocate sources
scratchBuffer.limit(channels);
AL10.alGenSources(scratchBuffer);
scratchBuffer.rewind();
scratchBuffer.get(sources = new int[channels]);
// could we allocate all channels?
if(AL10.alGetError() != AL10.AL_NO_ERROR) {
throw new LWJGLException("Unable to allocate " + channels + " sources");
}
// we have sound
soundOutput = true;
} catch (LWJGLException le) {
le.printStackTrace();
System.out.println("Sound disabled");
}
}
/**
* Adds a sound to the Sound Managers pool
*
* @param path Path to file to load
* @return index into SoundManagers buffer list
*/
public int addSound(String path) {
// Generate 1 buffer entry
scratchBuffer.rewind().position(0).limit(1);
AL10.alGenBuffers(scratchBuffer);
buffers[bufferIndex] = scratchBuffer.get(0);
// load wave data from buffer
WaveData wavefile = WaveData.create("sounds/" + path);
// copy to buffers
AL10.alBufferData(buffers[bufferIndex], wavefile.format, wavefile.data, wavefile.samplerate);
// unload file again
wavefile.dispose();
// return index for this sound
return bufferIndex++;
}
/**
* Destroy this SoundManager
*/
public void destroy() {
if(soundOutput) {
// stop playing sounds
scratchBuffer.position(0).limit(sources.length);
scratchBuffer.put(sources).flip();
AL10.alSourceStop(scratchBuffer);
// destroy sources
AL10.alDeleteSources(scratchBuffer);
// destroy buffers
scratchBuffer.position(0).limit(bufferIndex);
scratchBuffer.put(buffers, 0, bufferIndex).flip();
AL10.alDeleteBuffers(scratchBuffer);
// destory OpenAL
AL.destroy();
}
}
}
