[Alsa-user] VIA 8235 - CMI9761A AC'97: 5.1 channel setup

[thomas s. <t.s...@gm...>]

hi

1.
using ac3dec with vdr or /usr/bin/speaker-test with plug:surround51 (/usr/share/alsa/pcm/surround51.conf)
on a (crosschecked) sunnyline 5.1 headset it turns out here that the channels arrangement on the analog output jacks does not 
conform to the "reference" channels arrangement of the cmedia ms-windows driver/user space sw...

a)
BTW in this operating mode the mixer controls have no effects here and sounds seems to lack LFE.
VLC fails using the 5.1 mode of this device, too.

b)
is there a way to change the channel arrangement (especially C/LFE swap) in userspace?

yes, ive read most of the availlable conf docs at the project site but this rests as "cryptic code" to me,
who can read and understand this pcm conf stuff language? nor i can find a starting point for 
days now. ok, the driver loads and asound.state is restored but how are these conf files involved, i cant 
see the flow chain for now.

if the ac'97 patch source of the driver is incomplete or unadapted i would gladly help out on the dev list 
then.

and c-media corp. are cool guys, look there ;) http://www.cmedia.com.tw/ :

Product	File
(Click to Download) 	Version	Release Date 	OS	Category
CMI9761 	Please visit http://www.alsa-project.org/ 	  	  	Linux  	Hyperlink

:D ... so I hope the devs have got the "actual" specs availlable if they are supposed to do support 
work (in agreement?) for cmedia...

2.
to get software controls and equalizer ive first tried to pipe through mplayer but expectedly 
didnt work. can i use gstreamer...?


regards,
tom