All,
Found the problem, so I thought I would post.
Although it is rarely mentioned in Digital Sound HowTos, the IEC958 (aka SPDIF) interface has field that indicates whether its sending 'audio' or not. This field can be set by a parameter called AES0 or a tool called iecset.
My SPDIF was working, and I could hear audio in 2 channels, but when you use passthrough dolby digital it needs the audio bit *unset* -- and neither Xine or Mplayer was doing this automatically. I made a little script that solved the problem, that looked like this:
#/bin/sh
iecset audio 0
xine <parameters>
iecset audio 1
...This disables the audio bit before xine plays (using passthrough) then enables it back again so MP3s and standard digital PCM can play when Xine is done. Now everything works great. :)
Regards,
--
Joe
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