[alsa-devel] ALSA, GStreamer and surround

[Christian F.K. Schaller]

On Thu, 2007-03-29 at 16:17 +0200, Takashi Iwai wrote:
> At Thu, 29 Mar 2007 15:57:22 +0200,
> Christian F.K. Schaller wrote:
> > 
> > On Thu, 2007-03-29 at 14:01 +0200, Takashi Iwai wrote:
> > 
> > <snip>
> > > > Since Jan brought up the issue of behaviour differences between
> > > > plug:surround51 ad surround51 I thought I give you the output of that
> > > > too.
> > > > 
> > > > aplay -D surround51:0 dust51.wav 
> > > > Playing WAVE 'dust51.wav' : Signed 16 bit Little Endian, Rate 48000 Hz,
> > > > Channels 6
> > > > aplay: set_params:878: Broken configuration for this PCM: no
> > > > configurations available
> > > > 
> > > > aplay -D plug:surround51:0 dust51.wav 
> > > > Playing WAVE 'dust51.wav' : Signed 16 bit Little Endian, Rate 48000 Hz,
> > > > Channels 6
> > > > ALSA lib pcm_params.c:2152:(snd_pcm_hw_refine_slave) Slave PCM not
> > > > usable
> > > > aplay: set_params:878: Broken configuration for this PCM: no
> > > > configurations available
> > > 
> > > Which hardware do you have and which alsa-lib version are you using?
> > > surround51 should work in this case...
> > 
> > [cschalle at localhost Desktop]$ aplay -l
> > **** List of PLAYBACK Hardware Devices ****
> > card 0: I82801DBICH4 [Intel 82801DB-ICH4], device 0: Intel ICH [Intel
> > 82801DB-ICH4]
> >   Subdevices: 1/1
> >   Subdevice #0: subdevice #0
> > card 0: I82801DBICH4 [Intel 82801DB-ICH4], device 4: Intel ICH - IEC958
> > [Intel 82801DB-ICH4 - IEC958]
> >   Subdevices: 1/1
> >   Subdevice #0: subdevice #0
> > 
> > [cschalle at localhost Desktop]$ rpm -qa|grep alsa
> > alsa-lib-1.0.14-0.1.rc1.fc6
> > alsa-lib-devel-1.0.14-0.1.rc1.fc6
> > alsa-tools-1.0.12-4.fc6
> > alsa-utils-1.0.14-0.1.rc1.fc6
> 
> So far, so good.  And which codec chip?
> 
> You may see more (sometimes too) verbose errors when you set
> the environment variable LIBASOUND_DEBUG=1 or 2.  Give it a try.
> 
Hi Takashi

How do I figure out the codec chip? Also I am not sure what you are
looking for here, are you saying that the surround51 device should work
even on stereo only soundcards? and by using that Alsa should
automatically downmix?

Christian