open al debugging problem

epp1075 · June 12, 2012, 09:34:41

hello there,
i've been trying recently to run some of the lessons of this site using openal but i get these messages from netbeans.
Any help appreciated

Exception in thread "main" java.lang.NullPointerException
   at lesson3.Lesson3.loadALData(Lesson3.java:93) // AL10.alBufferData(buffer.get(BATTLE), waveFile.format, waveFile.data, waveFile.samplerate);

   at lesson3.Lesson3.execute(Lesson3.java:184) // if(loadALData() == AL10.AL_FALSE)

   at lesson3.Lesson3.main(Lesson3.java:220) //new Lesson3().execute();
AL lib: ReleaseALC: 1 device not closed
Java Result: 1

That's the full code :

package lesson3;

import java.io.IOException;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.util.Random;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.openal.AL;
import org.lwjgl.openal.AL10;
import org.lwjgl.util.WaveData;

/**
* $Id$
* <p>
* Lesson 3: Multiple Sources
* </p>
* @author Brian Matzon <brian@matzon.dk>
* @version $Revision$
*/
public class Lesson3 {

   /** Maximum data buffers we will need. */
public static final int NUM_BUFFERS = 3;

/** Maximum emissions we will need. */
public static final int NUM_SOURCES = 3;

/** Index of battle sound */
public static final int BATTLE = 0;

/** Index of gun 1 sound */
public static final int GUN1 = 1;

/** Index of gun 2 sound */
public static final int GUN2 = 2;

   /** Buffers hold sound data. */
IntBuffer buffer = BufferUtils.createIntBuffer(NUM_BUFFERS);

/** Sources are points emitting sound. */
IntBuffer source = BufferUtils.createIntBuffer(NUM_BUFFERS);

/** Position of the source sound. */
FloatBuffer sourcePos = BufferUtils.createFloatBuffer(3*NUM_BUFFERS);

/*
* These are 3D cartesian vector coordinates. A structure or class would be
* a more flexible of handling these, but for the sake of simplicity we will
* just leave it as is.
*/

/** Velocity of the source sound. */
FloatBuffer sourceVel = BufferUtils.createFloatBuffer(3*NUM_BUFFERS);

/** Position of the listener. */
FloatBuffer listenerPos = BufferUtils.createFloatBuffer(3).put(new float[] { 0.0f, 0.0f, 0.0f });

/** Velocity of the listener. */
FloatBuffer listenerVel = BufferUtils.createFloatBuffer(3).put(new float[] { 0.0f, 0.0f, 0.0f });

/** Orientation of the listener. (first 3 elements are "at", second 3 are "up")
Also note that these should be units of '1'. */
FloatBuffer listenerOri = BufferUtils.createFloatBuffer(6).put(new float[] { 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f });

public Lesson3() {
   // CRUCIAL!
// any buffer that has data added, must be flipped to establish its position and limits
listenerPos.flip();
listenerVel.flip();
listenerOri.flip();
}

/**
* boolean LoadALData()
*
* This function will load our sample data from the disk using the Alut
* utility and send the data into OpenAL as a buffer. A source is then
* also created to play that buffer.
*/
int loadALData() {
// Load wav data into a buffers.
AL10.alGenBuffers(buffer);

if(AL10.alGetError() != AL10.AL_NO_ERROR)
return AL10.AL_FALSE;

WaveData waveFile = WaveData.create("C://battle.wav");
AL10.alBufferData(buffer.get(BATTLE), waveFile.format, waveFile.data, waveFile.samplerate); //93
waveFile.dispose();

waveFile = WaveData.create("Gun1.wav");
AL10.alBufferData(buffer.get(GUN1), waveFile.format, waveFile.data, waveFile.samplerate);
waveFile.dispose();

waveFile = WaveData.create("Gun2.wav");
AL10.alBufferData(buffer.get(GUN2), waveFile.format, waveFile.data, waveFile.samplerate);
waveFile.dispose();

// Bind buffers into audio sources.
AL10.alGenSources(source);

if(AL10.alGetError() != AL10.AL_NO_ERROR)
return AL10.AL_FALSE;

AL10.alSourcei(source.get(BATTLE), AL10.AL_BUFFER, buffer.get(BATTLE) );
AL10.alSourcef(source.get(BATTLE), AL10.AL_PITCH, 1.0f );
AL10.alSourcef(source.get(BATTLE), AL10.AL_GAIN, 1.0f );
AL10.alSource (source.get(BATTLE), AL10.AL_POSITION, (FloatBuffer) sourcePos.position(BATTLE*3));
AL10.alSource (source.get(BATTLE), AL10.AL_VELOCITY, (FloatBuffer) sourceVel.position(BATTLE*3));
AL10.alSourcei(source.get(BATTLE), AL10.AL_LOOPING, AL10.AL_TRUE );

AL10.alSourcei(source.get(GUN1), AL10.AL_BUFFER, buffer.get(GUN1) );
AL10.alSourcef(source.get(GUN1), AL10.AL_PITCH, 1.0f );
AL10.alSourcef(source.get(GUN1), AL10.AL_GAIN, 1.0f );
AL10.alSource (source.get(GUN1), AL10.AL_POSITION, (FloatBuffer) sourcePos.position(GUN1*3));
AL10.alSource (source.get(GUN1), AL10.AL_VELOCITY, (FloatBuffer) sourceVel.position(GUN1*3));
AL10.alSourcei(source.get(GUN1), AL10.AL_LOOPING, AL10.AL_FALSE );

AL10.alSourcei(source.get(GUN2), AL10.AL_BUFFER, buffer.get(GUN2) );
AL10.alSourcef(source.get(GUN2), AL10.AL_PITCH, 1.0f );
AL10.alSourcef(source.get(GUN2), AL10.AL_GAIN, 1.0f );
AL10.alSource (source.get(GUN2), AL10.AL_POSITION, (FloatBuffer) sourcePos.position(GUN2*3));
AL10.alSource (source.get(GUN2), AL10.AL_VELOCITY, (FloatBuffer) sourceVel.position(GUN2*3));
AL10.alSourcei(source.get(GUN2), AL10.AL_LOOPING, AL10.AL_FALSE );

// Do another error check and return.
if(AL10.alGetError() == AL10.AL_NO_ERROR)
return AL10.AL_TRUE;

return AL10.AL_FALSE;
}

/**
* void setListenerValues()
*
* We already defined certain values for the Listener, but we need
* to tell OpenAL to use that data. This function does just that.
*/
void setListenerValues() {
AL10.alListener(AL10.AL_POSITION, listenerPos);
AL10.alListener(AL10.AL_VELOCITY, listenerVel);
AL10.alListener(AL10.AL_ORIENTATION, listenerOri);
}

/**
* void killALData()
*
* We have allocated memory for our buffers and sources which needs
* to be returned to the system. This function frees that memory.
*/
void killALData() {
AL10.alDeleteSources(source);
AL10.alDeleteBuffers(buffer);
}

/**
* Check for keyboard hit
*/
private boolean kbhit() {
try {
return (System.in.available() != 0);
} catch (IOException ioe) {
}
return false;
}

public void execute() {
// Initialize OpenAL and clear the error bit.
try {
   AL.create();
} catch (LWJGLException le) {
   le.printStackTrace();
return;
}
AL10.alGetError();

// Load the wav data.
if(loadALData() == AL10.AL_FALSE) { //184
System.out.println("Error loading data.");
return;
}

setListenerValues();

AL10.alSourcePlay(source.get(BATTLE));

// loop
int play;
Random random = new Random();

System.out.println("Press ENTER to exit");

while(!kbhit()) {
for(int i=1; i<NUM_SOURCES; i++) {
play = AL10.alGetSourcei(source.get(i), AL10.AL_SOURCE_STATE);

if(play != AL10.AL_PLAYING) {
   double theta = (double) (random.nextInt() % 360) * 3.14 / 180.0;

sourcePos.put(i*3+0, -(float) (Math.cos(theta)));
sourcePos.put(i*3+1, -(float) (random.nextInt()%2));
sourcePos.put(i*3+2, -(float) (Math.sin(theta)));

AL10.alSource(source.get(i), AL10.AL_POSITION, (FloatBuffer) sourcePos.position(i*3));
AL10.alSourcePlay(source.get(i));
}
}
}

killALData();
}

   public static void main(String[] args) {
new Lesson3().execute(); //220
   }
}

Thanks in advance

Fool Running · June 12, 2012, 12:25:00

Without being able to actually run the code at the moment, I would guess that it can't find the wav files so waveFile is null:

WaveData waveFile = WaveData.create("C://Battle.wav");
...
    waveFile = WaveData.create("Gun1.wav");
...
    waveFile = WaveData.create("Gun2.wav");

epp1075 · June 12, 2012, 13:57:50

I guess too that it can't find the wav files, but i don't get the reason.

i put them at C:// and tried to run and also put them in a folder in the project, but always the same result.
why it doesn't read them?

News:

open al debugging problem

epp1075

Fool Running

epp1075