> Hi there alsa-folks! So, I finally have a working ymf754-based card
> (Hoontech Digital XG) but I have no rear channel output. Is this
> supported in this driver? I can't seem to find an answer to this... but I
> will dive into the archives as soon as I finish with this e-missive to
> y'all. So, any thoughts on how to get the rear channel to show up? I've
> messed with all sorts of settings in alsamixer (which still doesn't save
> my settings, even when I use alsactl store).
> Thanks to everyone who's helped me get my card working, though. Great
> help, really! Todd Witter
Here's a quick summary :-)
There is, in fact, support for the rear output, but only with native Alsa
support. In other words, it's not directly supported in the OSS emulation
for the card.
You can map the output from the front speakers to the rear speakers by
adding the following lines to your .asoundrc file:
pcm.ch4dup {
type plug
slave.pcm surround40
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
}
pcm.dsp0 pcm.ch4dup
You can then play mp3 files with alsaplayer, and get rear output, by
doing:
$ alsaplayer -d ch4dup song.mp3
It would be nice if this was done automatically (the mapping of the front
output to the rear). I think this would let all OSS apps to use the rear
output as well. Jaroslav implied that this would be doable, but as far as
things go, it wasn't a priority for me and by the time I had some free
time to look at it, it had slipped my mind.
Adam
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