[Openal-devel] Waveform and queued buffers

[Daniel PEACOCK]

Hi Tobias,

The problem is that you have enabled Looping on the Source.   A looped
Source will never set queued buffers as processed because they are
effectively always pending in this scenario.    So, take this line ...

alSourcei(uiSource, AL_LOOPING, AL_TRUE);

out and the buffers will be marked as processed enabling you to unqueue
them.

Dan
Creative Labs (UK) Ltd.

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             -Tobias-                                                      
             <superplus at gmx.ne                                             
             t>                                                         To 
             Sent by:                  openal-devel at opensource.creative.co 
             openal-devel-boun         m                                   
             ces at opensource.cr                                          cc 
             eative.com                                                    
                                                                   Subject 
                                       Re: [Openal-devel] Waveform and     
             10/24/2008 07:09          queued buffers                      
             AM                                                            
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           





Hi,

meanwhile, I switched to the ALUT routines to generate sound which works
fine. No I still have the problem to change the queue content - I hear the
sound (2 different buffers), but when I try to remove the last played one,
I
always get the information that there are no processed buffers...

mexPrintf("Initializing OpenAL...");
    if (!alutInit (NULL, NULL))
    {
        mexPrintf("Failed to initialize OpenAL\n");
        return;
    }else
        mexPrintf("done!\n");

    uiBuffers[0] = alutCreateBufferWaveform(ALUT_WAVEFORM_SINE, 60.0, 0.0,
0.1);
    uiBuffers[1] = alutCreateBufferWaveform(ALUT_WAVEFORM_SINE, 100.0, 0.0,
0.1);

    alGenSources( 1, &uiSource );

    alSourceQueueBuffers(uiSource,2,uiBuffers);
    alSourcei(uiSource, AL_LOOPING, AL_TRUE);
    alSourcePlay( uiSource );

    Sleep(1000);

    alGetSourcei(uiSource, AL_BUFFERS_QUEUED, &processed);
    mexPrintf("Number of loaded buffers: %i\n",processed);

    alGetSourcei(uiSource, AL_BUFFERS_PROCESSED, &processed);
    mexPrintf("Number of processed buffers: %i\n",processed);
    while(processed--)
    {
        ALuint buffer;
        mexPrintf("Unqueuing buffers...");
        alSourceUnqueueBuffers(uiSource, 1, &buffer);
        mexPrintf("done!\n");
        mexPrintf("Generate waveform...");
        uiBuffer = alutCreateBufferWaveform(ALUT_WAVEFORM_SINE, 1000.0,
0.0,
0.1);
        mexPrintf("done!\n");
        mexPrintf("Queuing buffers...");
        alSourceQueueBuffers(uiSource, 1, &buffer);
        mexPrintf("done!\n");
    }

Output:
Initializing OpenAL...done!
Number of loaded buffers: 2
Number of processed buffers: 0

What's the problem here?

Thanks a lot and best regards,

Tobias

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