Date: Tue, 2 May 2006 11:09:14 +0400 From: "Yuriy Tsibizov" <Yuriy.Tsibizov@gfk.ru> To: "Hans-Werner Braun" <hwb@hpwren.ucsd.edu>, <freebsd-multimedia@freebsd.org> Subject: RE: Multi-channel sound input (WAS: Multi-channel sound output) Message-ID: <D6B2C454E5A77B4D8DA0B863D3D6D492CC315E@demon.hhp.local>
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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.
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