Execute script (GPIO Relay) based on if sound is being played

[yep_DD]

Hi guys, I want to monitor if audio is being played, e.g:

cat /proc/asound/card*/pcm*/sub*/status

And if any status contains running I want to execute a script (in my case turn on the amplifier). I want a simple solution and initially I thought it might be possible with udev or python or bash. Does any of you have a great and easy idea?

Thanks

[yep_DD]

while sleep 1; do
  if grep -q 'RUNNING' '/proc/asound/card0/pcm0p/sub0/status';
  then
    echo "Running!"
  else
    echo "Not Running!"
  fi
done

this seems to work but the amplifier produces a too loud cracking sound when switching on, I have two spare relais und my MagicMirror, I will hook up the speakers to those and try again.