Re: [linux-audio-dev] alsa mixing

Milan Mimica wrote:
> Hello!
>
> We're designing a new sound subsystem for allegro game programming
> library, and we would like to take advantages of multiple hardware voice
> capabilities.
>
> On linux, ALSA is the only software that possibly could expose API for
> such a capability, is that right? It is possible to open multiple PCM
> outputs and play sound at the same time on all of them. The problem is
> that we miss some basic mixing features, like panning a mono sound on
> multichannel output for example. A similar feature is implemented as
> 'route' ALSA plug-in that can be specified in .asoundrc file, but it is
> not flexible enough.
>
> So the question is, does ALSA provide such functionality? If not, which
> library could? Is it possible that linux OS doesn't provide any API to
> take advantage of such hardware capabilities?
>

Surely this is a task that is up to the app to handle?

You would have to provide a function to move the mono signal across the
channel array accounting for volume. It would not be too difficult once
the base code for the channel handling was in place.

-- 
Patrick Shirkey - Boost Hardware Ltd.
http://www.boosthardware.com
http://lau.linuxaudio.org - The Linux Audio Users guide
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