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  Moving sound problems  (Read 2330 times)
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Offline Andrew Davison

Junior Member


Medals: 2



« Posted 2006-10-18 06:26:08 »

Dear All,

I've been unable to get a sound to fade by moving its position.
I'm using JOAL release build 1.1 b01 for Windows.
Here's a snippet of code that doesn't work:

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    if (e.getSource() == playButton) {
      al.alSourcePlay(source[0]);

      float step = 20.0f;
      float zPos = 0.0f;
      for(int i=0; i < 50; i++) {
        zPos += step;

        float[] pos = new float[]{0, 0, zPos};
        al.alSourcefv(source[0], AL.AL_POSITION, pos, 0);

        try {
          Thread.sleep(250);   // sleep for 0.25 secs
       }
        catch(InterruptedException ex) {}
      }
    }


Any suggestions about how to get it to work?

- Andrew

Dr. Andrew Davison
Dept. of Computer Engineering
Prince of Songkla University, Hat Yai
Songkhla 90112, Thailand
Offline ho

Senior Newbie





« Reply #1 - Posted 2006-10-18 08:59:30 »

Hi!

please check if the listener is setup correctly:

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al.alListenerfv(AL.AL_POSITION, listenerPos, 0);
al.alListenerfv(AL.AL_VELOCITY, listenerVel, 0);      
al.alListenerfv(AL.AL_ORIENTATION, listenerOri, 0);


try setting up the source with a distance model of you choice and make sure that all variables used by the distance formula are set correctly
look here for more information about that: http://www.openal.org/oalspecs-specs/attenuation-by-distance.html

last but not least also make sure that you are playing a MONO wav file, openal can't fade a source with Stereo data

i hope this will help you! if not please post more of the source code!
have a nice day!

greetings from austria
Offline Andrew Davison

Junior Member


Medals: 2



« Reply #2 - Posted 2006-10-19 03:48:32 »

The problem was that the sound was stereo. The code works when the file was saved in mono.

A quick way of finding out on Win XP is to right click on the properties menu for the audio file, and then look at the "Summary" tab.

Thanks,
  Andrew

Dr. Andrew Davison
Dept. of Computer Engineering
Prince of Songkla University, Hat Yai
Songkhla 90112, Thailand
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