[alsa-devel] [Q] playing / recording mono on a stereo-only hardware

[Guennadi Liakhovetski]

On Sat, 30 Jan 2010, Michael Trimarchi wrote:

> Guennadi Liakhovetski wrote:
> > Hi
> > 
> > I know this question belongs rather to alsa-users, and I did ask it there,
> > but got no solution so far. Maybe someone here can help.
> > 
> > The recently posted SuperH SIU driver only supports stereo playback and
> > capture (channels_min = channels_max = 2). Is there a way to tell alsa-lib
> > to duplicate the mono-channel during playback and to mix recorded channels
> > (or use one of them), if mono recording is requested?
> >   
> I'm not an expert but I think that you can use plughw support of alsa-lib
> 
> pcm.record {
>       type plug
>       slave {
>               pcm record_hw
>       }
>       route_policy average
>       rate_converter "linear"
> }
> 
> I think that automatically change rate and channel for supporting mono channel
> too

Thanks for the snippet, but, I'm afraid, it didn't help either.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/