My problems is as follows:
I have a soundstorm chip (nforce2) using the intel8x0 driver with asla
1.0.11rc2. Both are build into the kernel. I want a seperate device to
play the audio on the rear speakers, without blocking any other audio
streams. I do not have hw mixing so I have to use dmix. The idea was to
define a new device:
pcm.skype {
type plug
slave.pcm "skypeduplex"
}
pcm.skypeduplex {
type asym
playback.pcm "nfrear"
capture.pcm "input"
}
Which uses a playback device nfrear. And which routes the the audio to
the rear channels and gives it to a dmix plugin (output) which combines
all the streams.
# skype
pcm.nfrear {
type route
slave.pcm "output" # :0 here is 1st hardware card (hw:0,0)
slave.channels 6
ttable.0.2 1 #left stereo channel to left rear channel
ttable.1.3 1 #right stereo channel to right rear channel
}
Sadly, this does not work.
When I try to configure xmms to use the skype device I get the following
error message:
ALSA lib pcm_params.c:2152:(snd_pcm_hw_refine_slave) Slave PCM not
usable
** WARNING **: alsa_setup(): No configuration available for playback: No
such file or directory
But if I set
slave.pcm "snd_card"
I can play songs on the rear speakers with xmms.
What am I doing wrong? Any ideas?
Here is the rest of my .asoundrc
# Set default sound card
# Useful so that all settings can be changed to a different card here.
pcm.snd_card {
type hw
card 0
device 0
}
# Allow mixing of multiple output streams to this device
pcm.output {
type dmix
ipc_key 1024
ipc_perm 0660 # Sound for everybody in your group!
slave.pcm "snd_card"
slave {
# This stuff provides some fixes for latency issues.
# buffer_size should be set for your audio chipset.
channels 6
period_time 0
period_size 1024
buffer_size 8192
}
#bindings {
# 0 0
# 1 1
#}
}
# Allow reading from the default device.
# Also known as record or capture.
pcm.input {
type dsnoop
ipc_key 2048
slave.pcm "snd_card"
#Possible artsd full duplex fix:
slave {
period_time 0
period_size 1024
buffer_size 8192
}
bindings {
0 0
1 1
}
}
# This is what we want as our default device
# a fully duplex (read/write) audio device.
pcm.duplex {
type asym
playback.pcm "output"
capture.pcm "input"
}
###################
# CONVERSION PLUG #
###################
# Setting the default pcm device allows the conversion
# rate to be selected on the fly.
# duplex mode allows any alsa enabled app to read/write
# to the dmix plug (Fixes a problem with wine).
pcm.!default {
type plug
slave.pcm "duplex"
}
# Apparently this is wrong (breaks mplayer for me opening the device)
#ctl.!default {
# type plug
# slave.pcm "snd_card"
#}
########
# AOSS #
########
# OSS dsp0 device (OSS needs only output support, duplex will break some
stuff)
pcm.dsp0 {
type plug
slave.pcm "output"
}
# OSS control for dsp0 (needed?...this might not be useful)
ctl.dsp0 {
type plug
slave.pcm "snd_card"
}
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