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#!/bin/sh
if [ "$1" = "-h" ]; then
echo "usage: pwloop SOURCE TARGET [VOLUME]" >&2
exit 1
fi
source_name=$1
target_name=$2
volume=0.2
[ -n "$3" ] && volume=$3
# spawn pwloopback
pw-loopback \
-m '[[FL FR]]' \
-g 'pwloop' \
--capture-props='media.class=Audio/Sink/Virtual audio.position=[FL FR] node.description="pwloop sink" node.name=pwloop' \
--playback-props='media.class=Audio/Source/Virtual audio.position=[FL FR] node.description="pwloop source" node.name=pwloop' \
&
# save pid for later
pwloop_pid=$!
trap '{ kill $pwloop_pid; }' EXIT
set -x
# set monitor volume prop
pw-cli set-param "$pwloop_oid" 2 "{ \"monitorVolumes\": [$volume, $volume] }"
# connect ports to pwloop
pw-link "$(pw-link -o | grep "$source_name" | grep 'FL$')" pwloop:input_FL
pw-link "$(pw-link -o | grep "$source_name" | grep 'FR$')" pwloop:input_FR
# connect ports from pwloop
pw-link pwloop:capture_FL "$(pw-link -i | grep "$target_name" | grep -v monitor | grep 'FL$')"
pw-link pwloop:capture_FR "$(pw-link -i | grep "$target_name" | grep -v monitor | grep 'FR$')"
# get object.id
pwloop_oid=$(pw-dump | jq -r --arg name "pwloop" --arg s "Audio/Sink/Virtual" \
'.[]|select(.type=="PipeWire:Interface:Node" and .info.props["node.name"]==$name and .info.props["media.class"]==$s)|.info.props["object.id"]')
wait
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