Short Script that creates a streaming setup in pulseaudio.

pulse-appmic-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
#2. Create remap-source as Virtual Microphone; AppSource
#3. Loopback the the ApplicationSink's audio back to the systems default audio output
#4. Loopback AppSink into virtual microphone AppSource

#                   ┌────────────┐
#                   │ AppSource  │
#                   └─────▲──────┘
#                         │
#┌────────────┐     ┌─────┴──────┐
#│ 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")


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

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