Short bash script to setup a streaming setup with pulseaudio.

pulse-streaming-setup.sh

#!/usr/bin/env bash

#Short script that creates a streaming setup in pulseaudio. It does the following:
#1. Create a null-sink as ApplicationSink to separate a single applications audio from the rest
#3. Create  another null-sink as Input-Combinator; CombineSink
#4. Create remap-source as Virtual Microphone; Vsource
#5. Loopback the the ApplicationSink's audio back to the systems default audio output
#6. Loopback ApplicationSink audio again, this time into the CombineSink
#7. Loopback actual microphone audio into the CombineSink as well
#8. Loopback combined application output and real-mic input from CombineSink into virtual microphone Vsource

#                   ┌────────────┐
#                   │ VSource    │
#                   └─────▲──────┘
#                         │
#┌────────────┐     ┌─────┴──────┐
#│SystemMic   ├────►│ CombineSink│
#└────────────┘     └─────▲──────┘
#                         │
#┌────────────┐     ┌─────┴──────┐
#│ App2Stream ├────►│   AppSink  │
#└────────────┘     └─────┬──────┘
#                         │
#┌────────────┐     ┌─────▼──────┐
#│OtherApps   ├────►│  SystemOut │
#└────────────┘     └────────────┘

#Function to choose a sink or source
function selectSinkOrSource(){
	local returnVal
	select i in $(pactl list $1 short | cut -f2); do returnVal=$i ; break ; done
	echo $returnVal
}

#Determine Sink to Redirect to Virtual Microphone
echo "Select output to redirect to virtual mic"
local selectedSink=$(selectSinkOrSource "sinks")

echo "Select real input to combine with virtual mic"
local selectedSource=$(selectSinkOrSource "sources")


pactl load-module module-null-sink sink_name=CombineSink sink_properties=device.description=CombineSink
pactl load-module module-null-sink sink_name=ApplicationSink sink_properties=device.description=ApplicationSink
pactl load-module module-remap-source master=CombineSink.monitor source_name=Vsource

#Loopback Output of ApplicationSink.monitor to System-Default-Out
pactl load-module module-loopback source=ApplicationSink.monitor sink="$selectedSink"

#Loopback Output of ApplicationSink.monitor to CombineSink
pactl load-module module-loopback source=ApplicationSink.monitor sink=CombineSink

#Loopback Output of Real-Microphone to CombineSink
pactl load-module module-loopback source="$selectedSource" sink=CombineSink