DLS fails at big audio frame sizes (was QuickTime Music Synthesizer + Core Audio)
DLS fails at big audio frame sizes (was QuickTime Music Synthesizer + Core Audio)
- Subject: DLS fails at big audio frame sizes (was QuickTime Music Synthesizer + Core Audio)
- From: Jeremy Sagan <email@hidden>
- Date: Tue, 31 Jan 2006 17:24:49 -0500
I included the old topic because I think they may be related but I
just wanted to give a heads up that I posted this in bug reporter:
radar://4428444
DLS Music Device drops sounds and play incorrectly when the core
audio packet size (kAudioDevicePropertyBufferFrameSize) is set to
3072 (probably anything greater than 1024 will exhibit this problem).
I also included a MIDI file with the bug report that reproduces the
drop outs.
When the packet size is set to 1024 or less it plays back fine.
Jeremy
On Dec 14, 2005, at 2:29 PM, Jeremy Sagan wrote:
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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