alsa issue on duplex mode CMI87x8 bases soundcards SPDIF_IN to 6CH_ANALOG_OUT

[John Donson <millim1974@xxxxxxxxx>]

Hello,

I have encountered a strange behavior when using alsa utils arecord, aplay, and ac3dec in combination with the snd_cmipci driver for CMI87x8 bases soundcards on ubuntu 11.04.

When I use: 

    >arecord -Dspdif -traw -fdat -r48000 -c2 | ffmpeg -f spdif -acodec copy -i - -f s16le - | ac3dec

everything is working fine on 2 channels, but when I use 

    >arecord -Dspdif -traw -fdat -r48000 -c2 | ffmpeg -f spdif -acodec copy -i - -f s16le - | ac3dec -c6

on 6 channel surround I always getting:

   >Using PCM device 'plug:surround51'
   >snd_pcm_open: Device or resource busy
   >Output open failed

I think this has something to do with the strange 2nd DAC/ADC usage of the driver, even a bug in the driver?

The hardware does duplex capture at SPDIF-IN and playback on 6 Channles OUT simultaneously. I have verified on Windows XP.

Any ideas?

BTW, how can I set the alsa driver in debug mode? ("option snd debug=2" did not work in the alsa-base.conf, resulting in totally missing alsa)

And how can I force module loading/reloading snd_cmipci on demand for driver tweaking purpose? (insmod, rmmod simply not working)

Please Help?

------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure 
contains a definitive record of customers, application performance, 
security threats, fraudulent activity, and more. Splunk takes this 
data and makes sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-novd2d

_______________________________________________
Alsa-user mailing list
Alsa-user@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-user