DeIM
Guru
Joined: 11 Apr 2006
Posts: 429
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 Posted: Fri Jan 05, 2024 9:35 am Post subject: pipewire 2 channel to 8 (7.1 / 2 + 5.1) channel filter |
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I was looking for something to distribute 2 channel audio source to 8 channel output (it's generic but my setup is something like headphones on FL FR and rest is connected to 5.1 loudspeaker)
I often got audio only from headphones. I manually connected channels in helvum but it was reset each time new audio played.
So I decided to solve it somehow and I found filter which makes opposite - 8 channels to 2 channels.
I made dirty custom changes which I would like to share, ask for review and tuning.
| Code: | # 2 to 8 channels sink
#
# Copy this file into a conf.d/ directory such as
# ~/.config/pipewire/filter-chain.conf.d/
#
context.modules = [
{ name = libpipewire-module-filter-chain
flags = [ nofail ]
args = {
node.description = "Virtual Surround Sink DeIM"
media.name = "Virtual Surround Sink DeIM"
filter.graph = {
nodes = [
# duplicate inputs
{ type = builtin label = copy name = copyFL }
{ type = builtin label = copy name = copyFR }
{ type = builtin label = copy name = copyFC }
{ type = builtin label = copy name = copyRL }
{ type = builtin label = copy name = copyRR }
{ type = builtin label = copy name = copySL }
{ type = builtin label = copy name = copySR }
{ type = builtin label = copy name = copyLFE }
# stereo output
{ type = builtin label = mixer name = mixFL }
{ type = builtin label = mixer name = mixFR }
{ type = builtin label = mixer name = mixFC }
{ type = builtin label = mixer name = mixLFE }
{ type = builtin label = mixer name = mixRL }
{ type = builtin label = mixer name = mixRR }
{ type = builtin label = mixer name = mixSL }
{ type = builtin label = mixer name = mixSR }
]
links = [
{ output = "copyFL:Out" input = "mixFL:In 1" }
{ output = "copyFR:Out" input = "mixFR:In 2" }
{ output = "copyFL:Out" input = "mixFC:In 3" }
{ output = "copyFR:Out" input = "mixLFE:In 4" }
{ output = "copyFL:Out" input = "mixRL:In 5" }
{ output = "copyFR:Out" input = "mixRR:In 6" }
{ output = "copyFL:Out" input = "mixSL:In 7" }
{ output = "copyFR:Out" input = "mixSR:In 8" }
]
inputs = [ "copyFL:In" "copyFR:In" "copyFC:In" "copyLFE:In" "copyRL:In" "copyRR:In" "copySL:In" "copySR:In" ]
outputs = [ "mixFL:Out" "mixFR:Out" "mixFC:Out" "mixLFE:Out" "mixRL:Out" "mixRR:Out" "mixSL:Out" "mixSR:Out" ]
}
capture.props = {
node.name = "effect_input.virtual-surround-7.1-deim"
media.class = Audio/Sink
audio.channels = 8
audio.position = [ FL FR FC LFE RL RR SL SR ]
}
playback.props = {
node.name = "effect_output.virtual-surround-7.1-deim"
node.passive = false
audio.channels = 8
audio.position = [ FL FR FC LFE RL RR SL SR ]
}
}
}
] |
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