Control the alsa volume (up/down/mute/set to x%) from the command line or in scripts

logo.png

volume.sh

#!/bin/bash

AMIX=$(which amixer)
CHANNEL="Master"
MAX_VOL=65536
AFTER_MUTE=$(($MAX_VOL/5))
VOL_STEP=$(($MAX_VOL/20))

function get_volume {
	$AMIX | egrep -i "^ *front left" | cut -f 6 -d " " | head -n 1
}

function get_muted {
	MUTE=$($AMIX | egrep -i "^ *front left" | cut -f 8 -d " " | head -n 1)
	if [[ $MUTE == "[on]" ]]; then
		echo "false"
	else
		echo "true"
	fi
}

function volume_percent {
	echo $((100*$(get_volume)/$MAX_VOL))
}

function set_volume {
	$AMIX set $CHANNEL $1 > /dev/null
	#echo "New volume: $1"
}

function volume_up {
	set_volume $(($(get_volume)+$VOL_STEP))
}

function volume_down {
	if [[ $(volume_percent) != 0 ]]; then
		set_volume $(($(get_volume)-$VOL_STEP))
	fi
}

function volume_mute {
	if [[ "$(get_muted)" == "true" ]]; then
		$AMIX set $CHANNEL unmute > /dev/null
		if [[ $(volume_percent) == 0 ]]; then
			set_volume $AFTER_MUTE
		fi
	else
		$AMIX set $CHANNEL mute > /dev/null
	fi
}

function volume_status {
	PERCENT=$(volume_percent)
	if [[ "$(get_muted)" == "true" ]]; then
		echo "Volume $PERCENT% (muted)"
	else
		echo "Volume $PERCENT%"
	fi

}

function update_qtile {
	python2 -c "from libqtile.command import Client;\
Client().widget['volume'].update(\"$1\")"
}

function display_help {
	echo "Usage:"
	echo "$0 [up | down | mute | set {0-100} | help ]"
	echo "$0 without arguments will display current volume"
}

case "$1" in
	up)
		volume_up
		volume_status
		;;
	down)
		volume_down
		volume_status
		;;
	mute)
		volume_mute
		volume_status
		;;
	help)
		display_help
		;;
	set)
		if [[ ($2 -lt 101) && ($2 -gt -1) ]]; then
			NEW_VOL=$((($2*MAX_VOL)/100))
			set_volume $NEW_VOL
			volume_status
		else
			display_help
		fi
		;;
	*)
		volume_status
esac

#update_qtile "$(volume_status)"