Re: [Alsa-user] auto upmix in .asoundrc

[Clemens L. <cl...@la...>]

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.


HTH
Clemens