Re: Play-through Support
Re: Play-through Support
- Subject: Re: Play-through Support
- From: "B.J. Buchalter" <email@hidden>
- Date: Mon, 21 Mar 2005 21:43:05 -0500
Jeff,
> 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.
I am ready to implement this stuff for the Mobile I/O, but I have nothing to
test it against, and we need a test case to ensure that we don't have
panic'ing code paths in the kernel extension. On top of that, I am not
really clear on how the routing controls are intended to be exposed and
implemented.
Is there any way you guys could write up small sample that would exercise
the DM properties on a driver as you expect them to work, and document what
properties are expected where -- even if it is in a totally arbitrary
virtual driver like the phantom audio driver?
It would be really great to break this logjam; I think that it is going to
require a bit more from the CA team to get things going...
Best regards,
B.J. Buchalter
Metric Halo
5 Donovan Drive
Hopewell Junction, NY 12533 USA
tel +1 845 223-6112
fax +1 603 250-2451
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