At Fri, 27 Nov 2009 12:33:36 +0100,
Clemens Ladisch wrote:
>
> Christopher Schramm wrote:
> > I'm looking for a way to realize an automatic upmix function.
> >
> > What I got right now in my .asoundrc is a pcm of type route which
> > distributes channels 0 and 1 to a 7.1 signal.
> >
> > The problem is, when source is a surround signal, every other channel
> > than 0 or 1 gets lost. What I want is stereo signals getting upmixed and
> > everything with more than two channels not getting touched-
>
> The plug plugin can duplicate channels, like this:
>
> pcm.mysurround71 {
> type plug
> slave {
> pcm "hw:0,0"
> channels 8
> }
> route_policy duplicate
> }
>
> However, this will send left/right channels to the center/LFE outputs
> separately instead of mixing them; there is currently no plugin that
> could do this.
The upmix plugin in alsa-plugins is for such a purpose.
See alsa-plugins/doc/upmix.txt.
Takashi
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