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Thread-Topic: Multi-channel sound output
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From: "Yuriy Tsibizov" <Yuriy.Tsibizov@gfk.ru>
To: "Hans-Werner Braun" <hwb@hpwren.ucsd.edu>, <freebsd-multimedia@freebsd.org>
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Subject: RE: Multi-channel sound input (WAS: Multi-channel sound output)
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> For example,
> once I get the output working, a next question will be how to read
> from a microphone-quad (or more) while still getting phasing/etc.
> right.
As I know, there are no multichannel recording hardware with FreeBSD =
drivers available. It can be possible to use multichannel audio over =
FireWire  (like http://mackie.com/products/onyx1220/index.html mixer =
with FireWire option card) if you need exact phasing, but I'm not shure =
they use "Audio and Music Data Transmission Protocol 2.1" =
Audio-Over-Firewire =
(http://www.1394ta.org/Technology/Specifications/specifications.htm) =
that will be possible to implement or some proprietary protocol (and you =
will need to get technical info from Mackie). It will be possible that =
you will need to write non-audio driver to send raw FireWire data and =
process it later, to avoid small delays when you demultiplex several =
channels into separate PCM streams that can cause phase shifts.

Yuriy.