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Libpd and OpenAL (C / C++)
  • fuzzylumpkinsfuzzylumpkins

    Having a hard time getting OpenAL to play any patch (using libpd). I was wondering if someone out there could help me out and explain what I'm doing wrong. I'm getting some output, but it's not the patch, it's just a repetitive buzz sound, which leads me to think that I'm doing something wrong per frame, rather than with initialization;

    void update(double timeSinceLastFrame) {

    pdBase->processFloat(1, inbuf, outbuf);
    alBufferData(_bufferHandle, AL_FORMAT_STEREO16, outbuf, 128, srate); alSourcei(_sourceHandle, AL_BUFFER, _bufferHandle); alSourcePlay(_sourceHandle);

    }

    Is this the generally used method for getting OpenAL to play the output of a patch?

  • pbrinkmannpbrinkmann

    I'm not really familiar with OpenAL, but it looks to me like you have a sample format mismatch -- you're computing float samples with libpd, but you're telling OpenAL to expect short int samples. That would explain the sort of buzz you're hearing; I once almost fried my studio monitors that way. Try pbBase->processShort instead.

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