QuickTime Music Synthesizer + Core Audio
QuickTime Music Synthesizer + Core Audio
- Subject: QuickTime Music Synthesizer + Core Audio
- From: Jeremy Sagan <email@hidden>
- Date: Wed, 14 Dec 2005 14:29:41 -0500
I just noticed today, since I now have the
kAudioUnitProperty_MaximumFramesPerSlice working, that if I set the
built-in audio device via kAudioDevicePropertyBufferFrameSize to a
value greater than 1024 then the internal voices (i.e QuickTime Music
synth) will be silent even when configured properly and sent
NAPlayNote events. I am using OS 10.4.3.
I suspect that this may be due to the fact that QT is not setting the
DLS MusicDevice to the correct slice size and the DLS MusicDevice is
in turn returning kAudioUnitErr_TooManyFramesToProcess errors.
However NAPlayNote is not returning any errors.
If I then revert to setting the kAudioDevicePropertyBufferFrameSize
<= 1024 then QT starts working again, although I have to deallocate
all voices and reallocate them.
Any ideas?
Should I cross post to the QuickTime mailing list?
Jeremy
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