Switch USB Audio mode (Headset <-> Speaker) on Ubuntu 16.04

usbaudioctl.sh

#!/bin/bash
set -e

# CARD=1
PROFILE_BASE=output:analog-stereo
DEVICE=usb-Generic_USB_Audio_200901010001-00
CARD_NAME="alsa_card.${DEVICE}"
SINK_BASE="alsa_output.${DEVICE}.analog-stereo"

# Find card index
while read -r card_line ; do
        read -r name_line
        CARD=$(echo $card_line | grep -oE '[0-9]+')
        # NAME=$(echo $name_line | grep -P '(?<=\s*name: ).*')
        NAME=$(echo $name_line | sed -n 's/^\s*name: <\(.*\)>/\1/p')
        if [ "$CARD_NAME" = "$NAME" ]; then
                break
        fi
done < <(pacmd list-cards | grep -E '(name|index):')

# Parse command
case $1 in
        # Headphones
h*)
        PROFILE="${PROFILE_BASE}-headphone+input:analog-stereo-mic";
        SINK="${SINK_BASE}-headphone"
;;
s*)
        PROFILE="${PROFILE_BASE}-speaker";
        SINK="${SINK_BASE}-speaker"
;;
*) echo "UNKNOWN PROFILE $1"; exit 1;;
esac

pacmd set-card-profile $CARD $PROFILE &&
pacmd set-default-sink $SINK