[mythtv-users] Surround Sound Processing in Linux
Karl Hegbloom
karlheg at gmail.com
Mon Mar 5 22:14:03 UTC 2007
On Mon, 2007-03-05 at 11:22 +0000, lists at higgers.me.uk wrote:
> Can anyone comment on their setup if their setup is slightly unusual
> and doesn't involve plain stereo into an amp or a digital feed into an amp?
>
> ANy info on a non-standard audio setup might give me some hints on how to
> configure my system.
>
> Thanks in advance,
>
> Steve.
The attached .asoundrc makes the default ALSA device be a 5.1 channel
surround sound device. It works for me with an Epox motherboard with
Nvidia NForce and the snd_intel8x0 driver.
I use the attached wrapper script to get surround audio from Xine and
Mplayer when it's run by MythTV. It lives in ~mythtv/bin, and in there
are symlinks to it named 'xine' and 'mplayer'. PATH is set so that the
~/bin directory is searched first. The .asound* files required by the
script are created by setting the mixer settings the way I want them and
then using 'alsactl' to dump them to the file.
I've found that DVD sound is much better - brighter - from Xine than
from MythTV's internal player.
--
Karl Hegbloom <karlheg at gmail.com>
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pcm.dmixs51 {
type dmix
ipc_key 1024
ipc_key_add_uid false # let multiple users share
ipc_perm 0660 # IPC permissions (octal, default 0600)
slave {
pcm "hw:0,0"
rate 48000
channels 6
period_time 0
period_size 1024
buffer_time 0
buffer_size 4096
}
bindings {
0 0
1 1
2 4
3 5
4 2
5 3
}
}
pcm.!default {
type plug
slave {
pcm "dmixs51"
}
}
pcm.asym51 {
type asym
playback.pcm "dmixs51"
capture.pcm "hw:0,0" # this might be "dsnoop:0"
}
pcm.dsp0 {
type plug
slave.pcm "asym51"
}
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