Native Multi Channel Audio
Native Multi Channel Audio
- Subject: Native Multi Channel Audio
- From: Perry Longinotti <email@hidden>
- Date: Mon, 4 Feb 2002 15:15:48 -0700
I was just looking over the preliminary audio and midi documentation for
OSX. Some questions come to mind, I hope this is acceptable forum for these
types of questions.
1. Multichannel I/O: If Audiostreams can have n-channels, would a softDVD
application without Dolby Surround detect a 6-channel output device on a
typical Mac with onboard stereo? How is device detection handled by the HAL?
Does the HAL conduct a topography of input and output pins at boot, are
restarts required? If there is 6-channel audio input present (DVD playback)
where is the output down-mixed (is there a special AU or does it happen at
the HAL)? If a 6-channel output device is present, what happens to stereo
sound output (is it converted to 6-channels)? I read the NSSound handles
SRC, does it also down mix? Can it 'up mix?' I noticed the reverb AU, is
this compatible with EAX, A3D, etc?
Perry Longinotti
Product Manager
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QSound Labs, Inc