VisClient/org/dronus/al/ALUtil.java

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package org.dronus.al;

import java.io.File;
import java.net.MalformedURLException;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;

import org.dronus.gl.Buffers;
import org.hfbk.vis.Prefs;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.openal.AL;
import org.lwjgl.openal.AL10;
import org.lwjgl.util.WaveData;
import org.lwjgl.util.vector.Vector3f;

public class ALUtil {

        public static boolean closed=false;

        public static void enable(boolean enabled){
                init();
                if (AL.isCreated())
                        AL10.alListenerf(AL10.AL_GAIN, enabled ? 1 : 0);
        }
        
        public static void init() {
                if (closed || AL.isCreated()) return;
                try {
                        AL.create(null, 15, 22050, true);
                        if (AL10.alGetError() != AL10.AL_NO_ERROR)
                                throw new RuntimeException("ALUtil: Cannot open Al Context.");
                        
                        AL10.alListenerf(AL10.AL_GAIN,0); //mute until enable(true).
                        AL10.alDopplerFactor(0);
                        //AL10.alDopplerVelocity(10);
                        
                        Runtime.getRuntime().addShutdownHook(new Thread(){
                                public void run() {
                                        if (AL.isCreated()){
                                                closed=true;
                                                AL.destroy();
                                                if(Prefs.current.verbose) System.out.println("AL destroyed!");
                                        }
                                }
                        });
                        
                } catch (LWJGLException le) {
                        closed=true;
                        System.out.println("No audio support.");
                }
        }

        public static void setSourceOrientation(int source, Vector3f dir, Vector3f up) {
                FloatBuffer b = BufferUtils.createFloatBuffer(6);
                dir.store(b);
                up.store(b);
                b.flip();
                AL10.alSource(source, AL10.AL_ORIENTATION, b);
        }

        public static int createSource() {
                init();
                
                IntBuffer b = Buffers.getIntBuffer();
                AL10.alGenSources(b);
                int source = b.get(0);

                AL10.alSourcef(source, AL10.AL_PITCH, 1f);
                AL10.alSourcef(source, AL10.AL_GAIN, 1f);
                
                AL10.alSourcef(source, AL10.AL_REFERENCE_DISTANCE, 15f);

                return source;
        }

        public static void setListenerOrientation(Vector3f dir, Vector3f up) {
                FloatBuffer b = BufferUtils.createFloatBuffer(6);
                dir.store(b);
                up.store(b);
                b.flip();
                AL10.alListener(AL10.AL_ORIENTATION, b);
        }

        public static int createBuffer(WaveData wav) throws MalformedURLException {
                init();
                
                IntBuffer b = Buffers.getIntBuffer();
                AL10.alGenBuffers(b);
                int buffer = b.get(0);

                AL10.alBufferData(buffer, wav.format, wav.data, wav.samplerate);
                return buffer;
        }
        public static WaveData loadWav(String wavFileName) throws MalformedURLException {
                File f=new File(wavFileName);
                return WaveData.create(f.toURI().toURL());
        }
        
        public static short[] sample(WaveData wav, int step){
                
                ByteBuffer b=wav.data;
                b.rewind();
                int len=b.remaining()/2/step;
                
                short[] sample=new short[len];
                
                for (int i=0; i<len; i++){
                        sample[i]=b.getShort(i*2*step);
                }                       
                
                return sample;          
        }
}

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