spdif output and mono audio

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Hi,

I am using iec958 spdif output on gigabyte ga-965-ds3 motherboard with
onboard hda-intel, kernel 2.6.18.6 alsa 1.0.13, I dont have a
asound.conf or asoundrc. Most of my sound is coming from mythtv (ac3
and dts passthru enabled), this works really well provided I run the
following commands (just once) before running myth:

amixer set IEC958 mute
aplay -D spdif /usr/share/sounds/alsa/Front_Center.wav
amixer set IEC958 unmute

I dont know why that is necessary but without it I get silence or
"helecopter" noises, I think the aplay command actually errors as
well, it certainly doesnt output any sound,  which is even stranger..

Anyway thats not the problem, the problem is that a small number of
programmes that I watch have mono audio, when myth attempts to play
them back I get the following error and no sound:

2006-12-26 16:22:46.585 Opening ALSA audio device 'iec958'.
2006-12-26 16:22:46.586 AudioOutput Error: Channels count (1) not
available: Invalid argument
2006-12-26 16:22:46.586 AudioOutput Error: Unable to set ALSA parameters

I understand why this happens, iec958 does not support mono audio,
either its simply not possible or not supported on my chipset, Ive
tried changing options in myth but it doesnt make any difference, it
always tries to set the channel count to 1.

I have asked on the myth mailing list but nobody has been able to
help, I wonder if anything can be done from the alsa side of things?
Perhaps alsa could be configured to accept mono audio on the iec958
and to resample it to 2 channel?

Andy

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