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filter-chain: add example upmix filter

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Add an example filter of PSD upmixing, using filters, convolver and
delay to simulate the upmixing logic in audioconvert.
This commit is contained in:
Wim Taymans 2024-10-24 10:57:54 +02:00
parent 42b994204d
commit 66942e5654
2 changed files with 152 additions and 0 deletions
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1
src/daemon/filter-chain/meson.build
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@ -9,6 +9,7 @@ conf_files = [
[ 'sink-eq6.conf', 'sink-eq6.conf' ],
[ 'sink-matrix-spatialiser.conf', 'sink-matrix-spatialiser.conf' ],
[ 'source-rnnoise.conf', 'source-rnnoise.conf' ],
[ 'sink-upmix-5.1-filter.conf', 'sink-upmix-5.1-filter.conf' ],
]
foreach c : conf_files

151
src/daemon/filter-chain/sink-upmix-5.1-filter.conf Normal file
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@ -0,0 +1,151 @@
# Stereo to 5.1 upmix sink
#
# Copy this file into a conf.d/ directory such as
# ~/.config/pipewire/filter-chain.conf.d/
#
context.modules = [
{ name = libpipewire-module-filter-chain
args = {
node.description = "Upmix Sink"
filter.graph = {
nodes = [
{ type = builtin name = copyFL label = copy }
{ type = builtin name = copyFR label = copy }
{ type = builtin name = copyOFL label = copy }
{ type = builtin name = copyOFR label = copy }
{
# this mixes the front left and right together
# for filtering the center and subwoofer signal-
name = mixF
type = builtin
label = mixer
control = {
"Gain 1" = 0.707
"Gain 2" = 0.707
}
}
{
# filtering of the FC and LFE channel. We use a 2 channel
# parametric equalizer with custom filters for each channel.
# This makes it possible to run the filters in parallel.
type = builtin
name = eq_FC_LFE
label = param_eq
config = {
filters1 = [
# FC is a crossover filter (with 2 lowpass biquads)
{ type = bq_lowpass freq = 12000 },
{ type = bq_lowpass freq = 12000 },
]
filters2 = [
# LFE is first a gain adjustment (with a highself) and
# then a crossover filter (with 2 lowpass biquads)
{ type = bq_highshelf freq = 0 gain = -20.0 }, # gain -20dB
{ type = bq_lowpass freq = 120 },
{ type = bq_lowpass freq = 120 },
]
}
}
{
# for the rear channels, we subtract the front channels. Do this
# with a mixer with negative gain to flip the sign.
name = subR
type = builtin
label = mixer
control = {
"Gain 1" = 0.707
"Gain 2" = -0.707
}
}
{
# a delay for the rear Left channel. This can be
# replaced with the convolver below. */
type = builtin
name = delayRL
label = delay
config = { "max-delay" = 1 }
control = { "Delay (s)" = 0.012 }
}
{
# a delay for the rear Right channel. This can be
# replaced with the convolver below. */
type = builtin
name = delayRR
label = delay
config = { "max-delay" = 1 }
control = { "Delay (s)" = 0.012 }
}
{
# an optional convolver with a hilbert curve to
# change the phase. It also has a delay, making the above
# left delay filter optional.
type = builtin
name = convRL
label = convolver
config = {
gain = 1.0
delay = 0.012
filename = "/hilbert"
length = 33
}
}
{
# an optional convolver with a hilbert curve to
# change the phase. It also has a delay, making the above
# right delay filter optional.
type = builtin
name = convRR
label = convolver
config = {
gain = -1.0
delay = 0.012
filename = "/hilbert"
length = 33
}
}
]
links = [
{ output = "copyFL:Out" input="mixF:In 1" }
{ output = "copyFR:Out" input="mixF:In 2" }
{ output = "copyFL:Out" input="copyOFR:In" }
{ output = "copyFR:Out" input="copyOFL:In" }
{ output = "mixF:Out" input="eq_FC_LFE:In 1" }
{ output = "mixF:Out" input="eq_FC_LFE:In 2" }
{ output = "copyFL:Out" input="subR:In 1" }
{ output = "copyFR:Out" input="subR:In 2" }
# here we can choose to just delay or also convolve
#
#{ output = "subR:Out" input="delayRL:In" }
#{ output = "subR:Out" input="delayRR:In" }
{ output = "subR:Out" input="convRL:In" }
{ output = "subR:Out" input="convRR:In" }
]
inputs = [ "copyFL:In" "copyFR:In" ]
outputs = [
"copyOFL:Out"
"copyOFR:Out"
"eq_FC_LFE:Out 1"
"eq_FC_LFE:Out 2"
# here we can choose to just delay or also convolve
#
#"delayRL:Out"
#"delayRR:Out"
"convRL:Out"
"convRR:Out"
]
}
capture.props = {
node.name = "effect_input.upmix_5.1"
media.class = "Audio/Sink"
audio.position = [ FL FR ]
}
playback.props = {
node.name = "effect_output.upmix_5.1"
audio.position = [ FL FR FC LFE RL RR ]
stream.dont-remix = true
node.passive = true
}
}
}
]