Re: Virtual Device Questions
Re: Virtual Device Questions
- Subject: Re: Virtual Device Questions
- From: "Jean-Alexis Montignies" <email@hidden>
- Date: Fri, 30 Jun 2006 14:03:51 +0200
On Thu, 29 Jun 2006 14:35:46 -0700
William Stewart <email@hidden> wrote:
You can make multiple virtuals (aggregates with just the one device in it)
- one for each of the stereo channels you want.
Then, make sure that for each of these you set the default stereo pair to
the 2 channels that you want to use for that particular device
Apps that are doing stereo output are expected to honour the stereo pair
designation - for instance, both iTunes and QT will, and I'd expect VLC to
as well.
As for efficiency, this depends in part on how the device is constructed.
For instance, if the device publishes its channels as a collection of stereo
pairs, (or mono channels), then the output units that we provide (AUHAL,
etc) will turn off those channels of the device that aren't being used.
So, I think what you need can already be supported.
Bill
On 29/06/2006, at 2:29 PM, Mike Silva wrote:
Oh, let's say I wanted to play audio out to multiple rooms using
different
instances of 'standard' apps (like VLC) with a single audio device
(for
example the Oxford Firewire-based chipset (OXFW971)).
Maybe there's a lot smarter way to do this w/ this kind of chipset.
Thanks,
Mike
On 6/29/06 5:22 PM, "William Stewart" <email@hidden> wrote:
No, but I'm also interested to know why you'd want to do this?
On 29/06/2006, at 1:59 PM, Mike Silva wrote:
On 6/29/06 4:01 PM, "William Stewart" <email@hidden> wrote:
(e.g. Create a virtual device using just 2
channels of an 8 channel audio output, so that the 2 channels are
accessible
to any core-audio app)
what apps are not dealing with 8 channel devices - that is a
problem
with those apps...
Bill
I was trying to see if I could 'break up' an existing 8 channel
device in to
4 completely independent stereo 'devices'. Is there any way to do
this such
that the device appears as 4 'devices' that can be used
independently?
Mike
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