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# From https://wiki.archlinux.org/title/Advanced_Linux_Sound_Architecture/Configuration_examples#Loopback_interface_with_dmix_external_interface
# Use this to output to external
pcm.dmixerout {
type dmix
ipc_key 1024
ipc_key_add_uid false
slave {
pcm "hw:CARDNAME,0"
channels 2
period_time 0
period_size 1024
buffer_size 4096
rate 44100
}
bindings {
0 0
1 1
}
}
# Use this to output to loopback
pcm.dmixerloop {
type dmix
ipc_key 2048
ipc_key_add_uid false
slave {
pcm "hw:Loopback,0,0"
channels 2
period_time 0
period_size 1024
buffer_size 4096
# If format is absent ALSA gives me slave PCM not usable, but it works w/o it for others
format S32_LE
rate 44100
}
bindings {
0 0
1 1
}
}
# Sends to the two dmix interfaces
pcm.quad {
type multi
# Necessary to have both slaves be dmix; both as hw doesn't give errors, but wouldn't
slaves.a.pcm "dmixerout"
slaves.a.channels 2
slaves.b.pcm "dmixerloop"
slaves.b.channels 2
bindings {
0 { slave a; channel 0; }
1 { slave a; channel 1; }
2 { slave b; channel 0; }
3 { slave b; channel 1; }
}
}
# Duplicates to quad, use this to output to loopback & external
pcm.stereo2quad {
type route
slave.pcm "quad"
# ttable.A.B G
# where A - input channel
# B - output channel
# G - volume gain (1.0 = original)
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
}
# Listens to loopback
# trying to play to stereo2quad when something is already listening gives me slave PCM not usable
# but listening when something is already playing on stereo2quad works
# and so does starting to listen, then playing to dmixerloop
pcm.loopin {
type dsnoop
ipc_key 1111
ipc_key_add_uid false
slave.pcm "hw:Loopback,1"
}
pcm.!default {
type asym
playback.pcm "plug:stereo2quad"
capture.pcm "plug:loopin"
}
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