Re: Use a plughw device inside the dmix plugin.

[Juan Zapatero <jazc@gmvsistemas.es>]

Because what is written to the sound card is pcm, I do a little tricky
processing on the buffers and make a one channel stereo out of a mono
stream...

What about the hardware, it is a Intel Corporation 82801FB/FBM/FR/FW/FRW
(ICH6 Family) AC'97 Audio Controller (rev 03).



El mié, 19-04-2006 a las 14:36 +0200, Takashi Iwai escribió:
> At Wed, 19 Apr 2006 13:51:13 +0200,
> Juan Zapatero wrote:
> > 
> > Ok as the VoIP is intendeed to work over GPRS links, it uses as
> > configuration:
> > 
> > Capture:
> > 	-16bitLE
> > 	-8000Hz
> > 	-1 channel
> > 
> > Playback:although the stream is of the same type as the one captured and
> > sent, in playback, it's needed for other reasons to process it into a
> > one channel stereo(meaning it is a stereo stream with audio only in one
> > of the channels), so the configuration is:
> > 	-16bitLE
> > 	-8000Hz
> > 	-2 channels 
> 
> Does it mean that the appliction packs the mono stream to a
> interleaved stereo by itself or lets alsa-lib do it?
> 
> And what about the hardware side?  The above are limitations of the
> application.  The plugins are used to absorb the difference between
> the hardware and application requirements.
> 
> 
> Takashi
> 
> 
> > El mié, 19-04-2006 a las 13:46 +0200, Takashi Iwai escribió:
> > > At Wed, 19 Apr 2006 13:39:13 +0200,
> > > Juan Zapatero wrote:
> > > > 
> > > > No I don't know why 1 channel configuration is only available through
> > > > plughw,
> > > 
> > > That's what I don't understand.  What configuration did you try?
> > > 
> > > > but it is, so I want to know if there is a way to force the dmix
> > > > plugin to work over plughw insted of hw:0,0 as actually it does.
> > > 
> > > No way.  Use plug _over_ dmix instead of _under_ dmix.
> > > 
> > > 
> > > Takashi
> > > 
> > > 
> > > > El mié, 19-04-2006 a las 13:33 +0200, Takashi Iwai escribió:
> > > > > At Wed, 19 Apr 2006 13:24:20 +0200,
> > > > > Juan Zapatero wrote:
> > > > > > 
> > > > > > By doing so, I would not be able to use dmixing...
> > > > > > The problem is that capture must be configured in 1 channel, and
> > > > > > playback in two, but, 1 channel setup can only be made through plughw.
> > > > > 
> > > > > Then I don't understand your requirment at all...
> > > > > 
> > > > > You just want to wrap plug over dmix for channel shrink/expansion?
> > > > > 
> > > > > 
> > > > > Takashi
> > > > > 
> > > > > > El mié, 19-04-2006 a las 13:19 +0200, Takashi Iwai escribió:
> > > > > > > At Wed, 19 Apr 2006 12:53:18 +0200,
> > > > > > > Juan Zapatero wrote:
> > > > > > > > 
> > > > > > > > I am using a VoIP application which uses different devices for capturing
> > > > > > > > and playback, because some audio processing is needed between audio
> > > > > > > > reception and playback. I have configured my default to use dmix plugin,
> > > > > > > > because it is required to be able to play different audio streams at
> > > > > > > > once. I can force the capture device to use 'default' plugin, but the
> > > > > > > > playback device only works under plughw. So, is there a way to use a
> > > > > > > > plughw device inside the dmix plugin?
> > > > > > > 
> > > > > > > You can override the definition of plughw, such as
> > > > > > > 
> > > > > > > 	pcm.!plughw "default"
> > > > > > > 
> > > > > > > But, fixing the app would be a better option, of course.
> > > > > > > 
> > > > > > > 
> > > > > > > Takashi
> > > > > > 
> > > > > > 
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 en el marco de su Sistema de Gestion de Seguridad de la 
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prohibida su divulgacion copia o distribucion a terceros sin la 
autorizacion expresa del remitente. Si Vd. ha recibido este mensaje 
 erroneamente, se ruega lo notifique al remitente y proceda a su borrado. 
Gracias por su colaboracion.
______________________
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information, according to our Information Security Management System,
 and intended solely for a specific individual to whom they are addressed.
 Any unauthorised copy, disclosure or distribution of this message
 is strictly forbidden. If you have received this transmission in error,
 please notify the sender immediately and delete it.
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