CS4205 SPDIF

[Matias Alejo Garcia <alsa@matiu.com.ar>]

Hi!

   I was able to use the SPDIF output of my Dell I8200 (CS4205 crappy
sound), by making the following small change in the alsa drivers:

===================================================================
RCS file: RCS/ac97_id.h,v
45c45,46
< #define AC97_ID_CS4205		0x43525958
---
> #define AC97_ID_CS4205		0x4352595B


Now, I have the IEC958 controls OK, and everything works, but, I still
wasn't able to output an AC3 stream into the SPDIF.

My card has no LFE, and REAR controls in the alsamixer. That is ok,
because the CS4205 is not a 5.1 sound card, at least in the 'analog'
sense.

If I try aplay -D plug:rear or aplay -D plug:lfe or aplay -D
plug:surround51 I get things like:
'aplay: set_params:764: Broken configuration for this PCM: no
configurations available'
which I think is ok. '-D plug:iec958' works.

BUT, what about sending a AC3 stream directly to the SPDIF?? How can I
do that??
I tried:
  ac3play --card 0,0 matrix.ac3
but I get nothing but noise. The same noise with
   mplayer -ao alsa9:iec958 -ac hwac3 -dvd 1

Mplayer tell me:
alsa-init: requested format: 48000 Hz, 2 channels, AC3
alsa-init: soundcard set to iec958:AES0=0x2,AES1=0x82,AES2=0x0,AES3=0x2

if I tried -channels 6, mplayer tried 'surround51' and I get other
error.

Any idea how can I try to do that??? Thank you very much!! 

Matias



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