AUHAL Full duplex issues
AUHAL Full duplex issues
- Subject: AUHAL Full duplex issues
- From: "Aridis-Lang, Simon" <email@hidden>
- Date: Fri, 6 Aug 2010 13:24:07 +1000
- Thread-topic: AUHAL Full duplex issues
Hi,
I'm having some trouble configuring an AUHAL device for full duplex operation. I have simplex built-in devices working well on a MBP, however some of my USB interfaces are presenting errors when calling AudioUnitRender.
My callbacks are configured as a kAudioUnitProperty_SetRenderCallback for scope 0 for simplex output and full duplex, and a kAudioOutputUnitProperty_SetInputCallback for scope 1 for simplex input devices.
Is this correct or do I need to register a callback for the input side as well and use bus numbers to determine which direction the unit is processing? I've found the TN for input configuration on an AUHAL, but can't find anything that talks about full duplex cases.
When I call AudioUnitRender I'm getting results varying from -50 (MOTU UltraLite Mk3) to a recursive call to the callback and a stack overflow!! (M-Audio Fast Track Ultra).
Also, one of my devices (an ESI U46) is not honouring calls to kAudioUnitProperty_MaximumFramesPerSlice, instead calling back with more frames than specified. Are there more steps to ensuring I get a callback with a fixed (or maximum) number of frames? Or do I need to realloc the AudioBuffer to fit the number of frames?
Regards,
Simon.
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