Re: Problems with alSourceQueueBuffers on MacOSX

Good morning!

Jason, Eric, thanks for your reply.
alGetError() after alSourceQueueBuffers() returns -50. I don't understand
that, -50 is not a valid return value for alGetError.
But I found some new. alSourceQueueBuffers returns some error (???) because
the buffer is corrupt.

I'll try to explain what happens with the code

ALenum err = alGetError(); *// at this point alGetError returns AL_NO_ERROR*

// Is the buffer empty?
alGetSourcei(uiSource, AL_BUFFERS_QUEUED, &iQueuedBuffers); *// iQueuedBuffers
is 0*
err = alGetError(); *// at this point alGetError returns AL_NO_ERROR*
if (iQueuedBuffers == 0)
{
    // Fill all the Buffers with decoded audio data from the OggVorbis file
    for (iLoop = 0; iLoop < PS_NUM_BUFFERS; iLoop++) *// PS_NUM_BUFFERS = 2*
    {
        ulBytesWritten = DecodeOggVorbis(&sOggVorbisFile, pDecodeBuffer,
ulBufferSize, ulChannels);
        if (ulBytesWritten)
        {
            alGetError();
            *// ulFormat is AL_FORMAT_STEREO16, pDecodeBuffer type is
(ALchar *), ulBytesWritten is 44100, ulFrequency is 44100*
               alBufferData(uiBuffers[iLoop], ulFormat, pDecodeBuffer,
ulBytesWritten, ulFrequency);
            err = alGetError(); *// at this point alGetError
returns AL_NO_ERROR!!!*
        }
    }

ALboolean bTest = alIsBuffer(uiBuffers[0]); *// bTest = AL_TRUE*
bTest = alIsBuffer(uiBuffers[1]); *// bTest = AL_TRUE*

ALint res;
alGetBufferi(uiBuffers[0], AL_BITS, &res); *// res = 16 (this is OK)*
alGetBufferi(uiBuffers[0], AL_CHANNELS, &res); *// res = 2 (this is OK)*
alGetBufferi(uiBuffers[0], AL_SIZE, &res); *// res = 44100 (this is OK)*
alGetBufferi(uiBuffers[0], AL_FREQUENCY, &res); *// res = -2147483648 (this
is CORRUPT!)*
*// uiBuffers[1] returns the same values*

err = alGetError(); *// at this point alGetError returns AL_NO_ERROR!!!*
alSourceQueueBuffers(uiSource, PS_NUM_BUFFERS, uiBuffers);
err = alGetError(); *// err is -50 ?¿?¿?¿?¿*
}

Thanks for your time!

El 14 de julio de 2011 23:15, Eric Wing <[email protected]> escribió:

> On 7/14/11, Juan Miguel Martín Muñoz <[email protected]> wrote:
> > Hi!
> >
> > I've this code to fill buffers with decode audio data
> >
> > // Is the buffer empty?
> > alGetSourcei(uiSource, AL_BUFFERS_QUEUED, &iQueuedBuffers);
> > if (iQueuedBuffers == 0)
> > {
> > // Fill all the Buffers with decoded audio data from the OggVorbis file
> > for (iLoop = 0; iLoop < PS_NUM_BUFFERS; iLoop++)
> > {
> > ulBytesWritten = DecodeOggVorbis(&sOggVorbisFile, pDecodeBuffer,
> > ulBufferSize, ulChannels);
> > if (ulBytesWritten)
> > {
> > alBufferData(uiBuffers[iLoop], ulFormat, pDecodeBuffer, ulBytesWritten,
> > ulFrequency);
> > }
> > }
> > alGetError();
> > alSourceQueueBuffers(uiSource, PS_NUM_BUFFERS, uiBuffers);
> > ALenum err = alGetError();
> > }
> >
> > // Start playing source
> > alSourcePlay(uiSource);
> >
> > This code works fine on PC but on MacOSX (10.6) I ger an error code "-50"
> > after alSourceQueueBuffers.
> >
> > Thanks in advance!
> >
>
> What does alGetString(err) say?
> Does alGetError return an error for any of your other OpenAL commands?
>
> Random guess: maybe you need more syntax:
> alSourceQueueBuffers(uiSource, PS_NUM_BUFFERS, &uiBuffers);
> or
> alSourceQueueBuffers(uiSource, PS_NUM_BUFFERS, &uiBuffers[0]);
>
> -Eric
> --
> Beginning iPhone Games Development
> http://playcontrol.net/iphonegamebook/
>

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