select_usb_headset.sh

#!/bin/bash

# default headphone volume (40000 is 40%)
DEFAULT_HEADPHONE_VOLUME=${DEFAULT_HEADPHONE_VOLUME-40000}
# default microphone volume (80000 is 80%)
DEFAULT_MICROPHONE_VOLUME=${DEFAULT_MICROPHONE_VOLUME-80000}
# enable headphone
ENABLE_USB_HEADPHONE=${ENABLE_USB_HEADPHONE-1}
# enable microphone
ENABLE_USB_MICROPHONE=${ENABLE_USB_MICROPHONE-0}

# sleep so pulseaudio has time to enable the new sink
sleep 1

# Use grep to figure out the name of the usb speaker
speaker=$(pacmd list-sinks | grep 'name:' | grep usb | sed 's/.*<//g;s/>.*//g;' | head -n 1)

# Use grep to figure out the name of the usb microphone
mic=$(pacmd list-sources | grep 'name:' | grep input | grep usb | sed 's/.*<//g;s/>.*//g;' | head -n 1)

if [ "z$ENABLE_USB_HEADPHONE" = "z1" ] ; then 
	if [ "z$speaker" != "z" ]
	then
	# use this speaker
	pacmd  set-default-sink "$speaker" | grep -vE 'Welcome|>>> $'
	# unmute
	pacmd  set-sink-mute "$speaker" 0 | grep -vE 'Welcome|>>> $'
	# Set the volume.  20000 is 20%
	pacmd  set-sink-volume "$speaker" $DEFAULT_HEADPHONE_VOLUME | grep -vE 'Welcome|>>> $'
	fi

	#play a sound to let you know that it was plugged in
	play /usr/share/sounds/speech-dispatcher/test.wav 2> /dev/null
fi 

if [ "z$ENABLE_USB_MICROPHONE" = "z1" ] ; then
	if [ "z$mic" != "z" ]
	then
	# use this microphone
	pacmd  set-default-source "$mic" | grep -vE 'Welcome|>>> $'
	# unmute
	pacmd  set-source-mute "$mic" 0 | grep -vE 'Welcome|>>> $'
	# Set the volume.  80000 is 80%
	pacmd  set-source-volume "$mic" 80000 | grep -vE 'Welcome|>>> $'
	fi
fi