Hello list,
I'm trying to get my surround system working, especially routing the 5.1
channels I have when there is only a stereo playback. This means that
the rear speakers and (especially) the subwoofer should output something
when I play "normal" music.
What I've got working so far: When playing back an AC3 stream in
passthrough mode, all six channels are working like a charm. In normal
"stereo" mode, however, only the two front channels work. When I issue a
$ speaker-test -c 6
I have output only on the front two speakers. So I tried to make ALSA
encode the whole stream to AC3 on-the-fly so my receiver recognizes it -
got some ideas off the net:
pcm.Filter_A52encode {
type a52
}
pcm.Filter_Upmix {
type upmix
slave.pcm "Filter_A52encode"
channels 6
}
However, ALSA complains:
ALSA lib pcm_direct.c:1464:(_snd_pcm_direct_get_slave_ipc_offset)
Invalid type 'a52' for slave PCM
There does not seem to be a "a52" plugin, although the web mentions it.
What am I doing wrong?
Please be patient with me, I promise to write a tutorial on how to do it
once I get it all done - it's already under construcion:
http://johannes-bauer.com/dolby/
Thanks in advance,
Greetings,
Johannes
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