Fake Pulseaudio balanced mono-output

Fake Pulseaudio software balun

Creates a mono "balanced" output from a stereo unbalanced one.

swbalun1+.sh

#!/bin/bash

# Inverts only one channel + uses less remaps.

# shorthands
ldmap="pacmd load-module module-remap-sink"
ldplug="pacmd load-module module-ladspa-sink"
ldcomb="pacmd load-module module-combine-sink"

# find output soundcard
ALSA="$(pacmd list-sinks | grep 'name:' | grep alsa | tail -n1 | sed -E 's/.*<(.*)>.*/\1/')"

# more shorthands
CH1="channels=1"
CH2="channels=2"

OUTMAP="master_channel_map"
INMAP="channel_map"

DESC="sink_properties=device.description"

MIX="remix=yes"
NOMIX="remix=no"


# passthrough for non-inverted output
$ldmap  sink_name=passNon  "$CH1" master="$ALSA"   "$OUTMAP=front-left"  "$INMAP=mono"               "$NOMIX" "$DESC=PassNoInv"

# remap inv to side
$ldmap  sink_name=comboInv "$CH1" master="$ALSA"   "$OUTMAP=front-right" "$INMAP=mono"               "$NOMIX" "$DESC=MergeInv"

# invert inv channel
$ldplug sink_name=inv      "$CH1" master=comboInv  plugin=inv_1429 label=inv                                  "$DESC=Invert"

# duplicate mono channel 
$ldcomb sink_name=split    "$CH1" slaves=passNon,inv                                                          "$DESC=Duplicate"

# mix L/R to mono
$ldmap  sink_name=monomix  "$CH2" master=split     "$OUTMAP=mono,mono"   "$INMAP=mono,mono"            "$MIX" "$DESC=MonoMix"

# set default
pacmd set-default-sink monomix

swbalun1.sh

#!/bin/bash

# Inverts only one channel.

# shorthands
ldmap="pacmd load-module module-remap-sink"
ldplug="pacmd load-module module-ladspa-sink"
ldcomb="pacmd load-module module-combine-sink"

# find output soundcard
ALSA="$(pacmd list-sinks | grep 'name:' | grep alsa | head -n1 | sed -E 's/.*<(.*)>.*/\1/')"

# more shorthands
CH1="channels=1"
CH2="channels=2"

OUTMAP="master_channel_map"
INMAP="channel_map"

DESC="sink_properties=device.description"

MIX="remix=yes"
NOMIX="remix=no"


# remap inv/noninv back to R/L output
$ldmap  sink_name=comboNon "$CH1" master="$ALSA"   "$OUTMAP=front-left"  "$INMAP=mono"               "$NOMIX" "$DESC=MergeNoInv"
$ldmap  sink_name=comboInv "$CH1" master="$ALSA"   "$OUTMAP=front-right" "$INMAP=mono"               "$NOMIX" "$DESC=MergeInv"

# invert inv channel
$ldplug sink_name=inv      "$CH1" master=comboInv  plugin=inv_1429 label=inv                                  "$DESC=Invert"

# split mono/mono to individual inv/noninv
$ldmap  sink_name=splitNon "$CH1" master=comboNon  "$OUTMAP=mono" "$INMAP=front-left"                "$NOMIX" "$DESC=SplitNoInv"
$ldmap  sink_name=splitInv "$CH1" master=inv       "$OUTMAP=mono" "$INMAP=front-right"               "$NOMIX" "$DESC=SplitInv"

# duplicate mono/mono 
$ldcomb sink_name=split    "$CH2" slaves=splitNon,splitInv                                                    "$DESC=Duplicate"

# mix L/R to mono/mono
$ldmap  sink_name=monomix  "$CH2" master=split     "$OUTMAP=front-left,front-right" "$INMAP=mono,mono" "$MIX" "$DESC=MonoMix"

# set default
pacmd set-default-sink monomix

swbalun2.sh

#!/bin/bash

# Inverts two channels and then picks one.

# shorthands
ldmap="pacmd load-module module-remap-sink"
ldplug="pacmd load-module module-ladspa-sink"
ldcomb="pacmd load-module module-combine-sink"

# find output soundcard
ALSA="$(pacmd list-sinks | grep 'name:' | grep alsa | head -n1 | sed -E 's/.*<(.*)>.*/\1/')"

# more shorthands
CH1="channels=1"
CH2="channels=2"

OUTMAP="master_channel_map"
INMAP="channel_map"

DESC="sink_properties=device.description"

MIX="remix=yes"
NOMIX="remix=no"


# remap inv/noninv back to R/L output
$ldmap  sink_name=comboNon "$CH1" master="$ALSA" "$OUTMAP=front-left"  "$INMAP=front-left"         "$NOMIX" "$DESC=MergeNoInv"
$ldmap  sink_name=comboInv "$CH1" master="$ALSA" "$OUTMAP=front-right" "$INMAP=front-right"        "$NOMIX" "$DESC=MergeInv"

# invert inv channel
$ldplug sink_name=inv      "$CH2" master=comboInv  plugin=inv_1429 label=inv                                "$DESC=Invert"

# duplicate mono/mono 
$ldcomb sink_name=split    "$CH2" slaves=inv,comboNon                                                       "$DESC=Duplicate"

# mix L/R to mono/mono
$ldmap  sink_name=monomix  "$CH2" master=split   "$OUTMAP=front-left,front-right" "$INMAP=mono,mono" "$MIX" "$DESC=MonoMix"

# set default
pacmd set-default-sink monomix

swdel.sh

#!/bin/bash

# Unload modules.

pacmd unload-module module-combine-sink
pacmd unload-module module-remap-sink
pacmd unload-module module-ladspa-sink