[Openal-devel] Why does alDeleteBuffers gives a AL_INVALID_OPERATION error?

[Mentalray]

Hi,

I'm using OpenAL for an iPhone application, but I'm having a weird issue. 
At some point I need to clear all of the queued buffers from one source. 
Here's how I proceed (simplified version of the code):

alSourceStop( sourceId );
alGetSourcei( sourceId, AL_BUFFERS_PROCESSED, &numProcessed );
while( numProcessed-- ) {
    alSourceUnqueueBuffers( sourceId, 1, &bufferId );
    alDeleteBuffers( 1, bufferId ); // this fails with AL_INVALID_OPERATION
}

>From what I understand, AL_INVALID_OPERATION is returned from
alDeleteBuffers when the buffer is still in use.  This is not the case here.

I there any other things that I should check?

Any help would be appreciated,
Martin
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