[Bug 11764] Add support for multi-channel audio

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=11764

--- Comment #33 from Raymond <superquad.vortex2 at gmail.com> 2011-01-07 20:59:02 CST ---
That accelerated alsa driver for emu10k1 only provide stereo control of those
hardware mixing volume controls provided by snd-emu10k1 similar to

http://git.alsa-project.org/?p=alsa-tools.git;a=blob;f=hwmixvolume/hwmixvolume

It actually playback different openal mono source through different subdevices
instead of mixing those mono sources by openal 

That implementation is the basis if winealsa want to provide dsound hardware
secondary buffers for ds3d

you will need to enhance the openal-alsa-emu10k1 to control the rear speakers
since the volume of the rear speakers is controlled by another sets of "EMU10K1
PCM Volume" , "EMU10K1 PCM Send Route" and "EMU10K1 Send Volume" of the rear
device

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