Can I create a "fake" HAL device to receive samples?
Can I create a "fake" HAL device to receive samples?
- Subject: Can I create a "fake" HAL device to receive samples?
- From: Mark Coniglio <email@hidden>
- Date: Thu, 7 Jul 2005 07:24:18 -0400
In my application Isadora, I would like to be able to manipulate the
location of a QuickTime movie's sound on a multi-channel sound output
device connected to multiple (i.e., more than 2) speakers.
My previous method was to register a several Sound Output Components
for a specific HAL device, one SOC per each two channels on the HAL
device.But Sound Output Components are no longer used in QT7 -- so
that method is broken now.
Because you can assign a QT Movie to play on a specific audio device,
one idea that occurs to me is to create a "fake" HAL device for each
pair of channels, which would in turn feed the sound data to the
appropriate channels on the real HAL device. Then I could assign the
Audio Context for the movie to the fake HAL, which would in turn
route it to correct pair of channels on the real device.
(Of course, the problem in QuickTime is that you can only set the
Audio Context for the entire movie, not for individual tracks -- but
we'll leave that for the moment.)
The other possibility is to use the 3D Audio mixer Audio Unit. But
the problem with that is that it only supports up to 5.1, and can't
access _every_ channel on the device (e.g., all eight channels on my
MOTU 828.) And, it doesn't appear as a HAL device so I don't think I
can assign the output of the QuickTime movie to an Audio Graph.
Is it possible to register a 'fake" HAL device within my code, so
that I can route the QT Movie Sound data to that device.
Many Thanks,
Mark
--
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Mark Coniglio, Artistic Co-Director | email@hidden
Troika Ranch Dance Theater | http://www.troikaranch.org
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