start_obs_with_zoom.sh

#/bin/bash

########################################
##          CC BY-NC-SA 4.0           ##
##  Original script by Peter Nerlich  ##
##  This code is provided as-is, you  ##
##  are responsible for anything you  ##
##  do with it and the consequences.  ##
########################################

dev="/dev/video10"  # The device file to create as a loopback device. Keeping this fixed speeds things up as you dont have to change it in OBS all the time.
devname="OBS"  # The name to give the device. Will show up in Zoom.
aj_file="my_snapshot.xml"  # The aj-snapshot file to restore from if you choose to do so.


function check_v4l2() {
	v4l2-ctl --list-devices | grep -Pzoq "v4l2loopback.*\n.*$dev"
}
function cleanup_v4l2() {
	sudo modprobe -r v4l2loopback
}
function setup_v4l2() {
	sudo modprobe v4l2loopback video_nr=10 exclusive_caps=1 card_label=$devname
}

function check_obs() {
	pgrep obs
}
function kill_obs() {
	pkill obs
}
function run_obs() {
	obs &> /dev/null &
}

function check_zoom() {
	pgrep zoom
}
function kill_zoom() {
	pkill zoom
}
function run_zoom() {
	XDG_CURRENT_DESKTOP=gnome flatpak run us.zoom.Zoom &> /dev/null &
}

function check_carla() {
	pgrep carla
}
function kill_carla() {
	pkill carla
}
function run_carla() {
	carla  &> /dev/null &
}

function run_aj_restore() {
	aj-snapshot -x -r "$aj_file"
}



check_v4l2
if [ $? -eq 0 ]; then
	echo "Video loopback device found."
	read -p "- Create video loopback device? (y[N]c)  " yn
	case $yn in
		[Cc]* ) cleanup_v4l2 && setup_v4l2;;
		[Yy]* ) setup_v4l2;;
		* ) ;;
	esac
else
	read -p "- Create video loopback device? ([Y]nc)  " yn
	case $yn in
		[Cc]* ) cleanup_v4l2 && setup_v4l2;;
		[Nn]* ) ;;
		* ) setup_v4l2;;
	esac
fi

echo ""

check_obs
if [ $? -eq 0 ]; then
	echo "OBS is running."
	read -p "- Start OBS? (y[N]c)  " yn
	case $yn in
		[Cc]* ) kill_obs && run_obs;;
		[Yy]* ) run_obs;;
		* ) ;;
	esac
else
	read -p "- Start OBS? ([Y]nc)  " yn
	case $yn in
		[Cc]* ) kill_obs && run_obs;;
		[Nn]* ) ;;
		* ) run_obs;;
	esac
fi
echo ""
echo "##############"
echo ""
echo "- start v4l2 output to $dev"
echo ""
echo "- ensure all videos are monitored"
echo "   (Advanced Audio Properties → Audio Monitoring → Monitor and Output"
echo "    view with 'Active Sources Only' unchecked)"
echo ""

check_zoom
if [ $? -eq 0 ]; then
	echo "Zoom is running."
	read -p "- Start Zoom? (y[N]c)  " yn
	case $yn in
		[Cc]* ) kill_zoom && run_zoom;;
		[Yy]* ) run_zoom;;
		* ) ;;
	esac
else
	read -p "- Start Zoom? ([Y]nc)  " yn
	case $yn in
		[Cc]* ) kill_zoom && run_zoom;;
		[Nn]* ) ;;
		* ) run_zoom;;
	esac
fi
echo ""
echo "##############"
echo ""
echo "- enter meeting"
echo ""
echo "- use $devname as webcam"
echo ""
echo "- Share Screen → Advanced → Computer Audio"
echo ""

check_carla
if [ $? -eq 0 ]; then
	echo "Carla is running."
	read -p "Start Carla? (y[N]c)  " yn
	case $yn in
		[Cc]* ) kill_carla && run_carla;;
		[Yy]* ) run_carla;;
		* ) ;;
	esac
else
	read -p "Start Carla? ([Y]nc)  " yn
	case $yn in
		[Cc]* ) kill_carla && run_carla;;
		[Nn]* ) ;;
		* ) run_carla;;
	esac
fi
echo ""
echo "##############"
echo ""
echo "- Assign each video of 'OBS/OBS-Monitor' to 'Zoom VoiceEngineLoopback'"

read -p "    Try to restore that from file '$aj_file' using aj-snapshot? All other audio connections will be removed! ([Y]n)  " yn
case $yn in
	[Nn]* ) ;;
	* ) run_aj_restore;;
esac

echo ""
echo "DONE!"