Re: Play-through Support
Re: Play-through Support
- Subject: Re: Play-through Support
- From: Jeff Moore <email@hidden>
- Date: Mon, 21 Mar 2005 14:16:52 -0800
Unfortunately, to my knowledge there aren't any drivers out there that support the newer monitor path controls. The best you are going to find are ones that support the monitor on/off control (aka kAudioDevicePropertyPlayThru).
The kAudioDevicePropertyPlayThruDestination family of properties are there to allow for a modest amount of routing, much like kAudioDevicePropertyDataSource. The tacit assumption is that each monitor channel corresponds to each input channel. Thus, the kAudioDevicePropertyDataSource controls where the data comes from for the input channel and kAudioDevicePropertyPlayThruDestination controls where the data goes along the monitor pathway.
On Mar 21, 2005, at 1:57 PM, Ethan Funk wrote: Does any one know which, if an audio interfaces currently support The CoreAudio playthough device properties?
I need to be able to use kAudioDevicePropertyPlayThru, kAudioDevicePropertyPlayThruVolumeScalar, and kAudioDevicePropertyPlayThruStereoPan to create a low latency monitor channel that will track the gains/balance of the real mix. And I need an interface to play with to make my code work.
I also need to understand how to use kAudioDevicePropertyPlayThruDestination and kAudioDevicePropertyPlayThruDestinations to set things up. I am assuming for example that kAudioDevicePropertyPlayThruDestinations would return the four stereo mix busses on a MOTU interface if the driver does support it. Is this correct? If so, it appears that only a single destination can be set for an input to play through, and in the case of MOTU, a single output pair for the mix bus, correct?
--
Jeff Moore
Core Audio
Apple
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