On Mon, 3 Feb 2003, Stuart Clarke wrote:
> 'Lo all,
>
> I'm attempting to play XVID movies (with AC3 sound) using mplayer and the ALSA
> 0.9 system of sound drivers. I only have one sound card (ICH - Intel
> 82801CA-ICH3) which has an SP/DIF output port. I would therefore like to
> route the movies' AC3 sound through the SP/DIF port to my external decoder.
> Now, as I understand it, ALSA normally places a sound card's digital
> pass-through device at device number 3 (index 2) of a particular card.
Not really. It's hardware dependant. We have abstract names for S/PDIF out
(iec958 or spdif) and alsa-lib routes signal to right device.
> Listing the sound card devices in /proc/asound/card0, however, gives the
> following:
>
> beef@weenerbo:~$ ls -la /proc/asound/card0
> total 0
> dr-xr-xr-x 5 root root 0 Feb 3 02:06 .
> dr-xr-xr-x 6 root root 0 Feb 3 02:06 ..
> -rw-r--r-- 1 root root 0 Feb 3 02:06 ac97#0
> -rw-r--r-- 1 root root 0 Feb 3 02:06 ac97#0regs
> -rw-r--r-- 1 root root 0 Feb 3 02:06 ac97#1-1
> -rw-r--r-- 1 root root 0 Feb 3 02:06 ac97#1-1regs
> -r--r--r-- 1 root root 0 Feb 3 02:06 id
> -rw-r--r-- 1 root root 0 Feb 3 02:06 intel8x0
> -rw-r--r-- 1 root root 0 Feb 3 02:06 oss_mixer
> dr-xr-xr-x 3 root root 0 Feb 3 02:06 pcm0c
> dr-xr-xr-x 3 root root 0 Feb 3 02:06 pcm0p
> dr-xr-xr-x 3 root root 0 Feb 3 02:06 pcm1c
> beef@weenerbo:~$
>
> Shouldn't there be a directory entry called 'pcm2p'?
>
> I've tried to use the hw:0,0 device instead, but it simply gives me sound from
> my laptop's speakers.
Try to use the 'spdif' device (aplay -Dplug:spdif <somefile>).
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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