#!/bin/bash
# Credit for code:
   #https://unix.stackexchange.com/users/14353/cliff-stanford
   #https://unix.stackexchange.com/users/231160/nik-gnomic
# Post on stackexchange: https://unix.stackexchange.com/questions/467456/how-to-mute-sound-when-xscreensaver-locks-screen/589614#589614

# Do nothing for a bit to ensure gdbus is up and awake, etc.
sleep 300

gdbus monitor -e -d org.xfce.ScreenSaver | grep -h ActiveChanged --line-buffered |
  while read LINE; do
    case "${LINE}" in
      *"(true,)"*)
        pactl set-sink-mute @DEFAULT_SINK@ on
        ;;
      *"(false,)"*)
        pactl set-sink-mute @DEFAULT_SINK@ off
        ;;
    esac
  done
exit