mute-music-player.sh

#!/bin/bash
# vim: set sts=2 sw=2 et :
#
# Author: Nirbheek Chauhan <nirbheek.chauhan@gmail.com>
# License: BSD
#
# Mutes $MUSIC_APP_NAME when $APP_NAME starts playing something

APP_NAME="lt-stream-app"
MUSIC_APP_NAME="Rhythmbox"
MUTED_BY_US=0

get_sink_input_id_from_app_name() {
  local app_name=$1
  pactl list sink-inputs | grep -B 20 "application.name = \"$app_name\"" \
    | grep "Sink Input" | cut -f2 -d\# 
}

while true; do
  sleep 0.5
  app_id=$(get_sink_input_id_from_app_name "$APP_NAME")
  music_id=$(get_sink_input_id_from_app_name "$MUSIC_APP_NAME")
  if [[ -z $music_id ]]; then
    echo "Music player is not playing?"
    continue
  fi
  if [[ -n $app_id ]]; then
    if [[ $MUTED_BY_US == 0 ]]; then
      pactl set-sink-input-mute "$music_id" 1
      MUTED_BY_US=1
      echo "Music player muted"
    fi
  elif [[ $MUTED_BY_US == 1 ]]; then
    pactl set-sink-input-mute "$music_id" 0
    echo "Music player unmuted"
    MUTED_BY_US=0
  fi
done