Volume control script for PulseAudio

pavol.sh

#!/bin/bash
SINK="`pactl info | grep -P '^Default Sink: ' | sed 's/[^:]\+:\s\+//'`"
[[ -z "$SINK" ]] && exit 1

if [[ "$SINK" =~ DragonFly ]]; then
  INCR='24'
  MIN_VOLUME=65050
  MAX_VOLUME=65146
else
  INCR='2%'
  MIN_VOLUME=0
  MAX_VOLUME=65536
fi

function volume() {
  VOLUME="`pacmd dump | grep -P '^set-sink-volume.*\s+0x[1-9a-f][0-9a-f]*$'`"
  echo "$VOLUME" | grep -qF "$SINK"
  if [[ $? -eq 0 ]]; then
    VOLUME="`echo "$VOLUME" | grep -oP '0x[1-9a-f][0-9a-f]*$'`"
    printf "%d\n" "$VOLUME"
  else
    echo 0
  fi
  unset VOLUME
}

volume

if [[ -z "$1" ]]; then
  echo "Usage: $0 <up | down | mute | unmute | toggle>"
  exit 1
fi

case "$1" in
  up)
    pactl -- set-sink-volume "$SINK" "+$INCR"
    VOLUME="`volume`"
    if [[ $VOLUME -gt $MAX_VOLUME ]]; then
      pactl -- set-sink-volume "$SINK" "$MAX_VOLUME"
    fi
    ;;
  down)
    pactl -- set-sink-volume "$SINK" "-$INCR"
    VOLUME="`volume`"
    if [[ $VOLUME -lt $MIN_VOLUME ]]; then
      pactl -- set-sink-volume "$SINK" "$MIN_VOLUME"
    fi
    ;;
  mute)
    pactl -- set-sink-mute "$SINK" 1
    ;;
  unmute)
    pactl -- set-sink-mute "$SINK" 0
    ;;
  toggle)
    MUTED="`pacmd dump | grep -P '^set-sink-mute.*\s+yes$'`"
    echo "$MUTED" | grep -qF "$SINK"
    if [[ $? -eq 0 ]]; then
      pactl -- set-sink-mute "$SINK" 0
    else
      pactl -- set-sink-mute "$SINK" 1
    fi
    ;;
  *)
    echo "Unknown command: $1"
    exit 1
    ;;
esac

volume