Volume control for crouton-based linux installations on chromebooks using PulseAudio

volume

#!/usr/bin/env bash

##
## Volume control script for PulseAudio and crouton chromebooks
##
## https://github.com/dnschneid/crouton/wiki/Keyboard
##
## v1.0: Initial release
## v1.1: Simplified mute toggle
## v1.2: Fixed (harmless) error that occured when capping max volume
##
## Usage:
##   volume down
##   volume up
##   volume mute
##

min_vol=0
max_vol=65536
vol_incr=4096

function set_relative_volume {
	volume=$(($1+$2))
	volume=$([ $volume -gt $(($max_vol)) ] && echo $max_vol || echo $volume)
	volume=$([ $volume -lt $(($min_vol)) ] && echo $min_vol || echo $volume) 
	new_volume=$(printf "0x%x" $volume)
	pactl set-sink-volume $3 $new_volume
}

sink="cras-sink"

volume=$(pacmd dump | grep "set-sink-volume $sink" | cut -d" " -f3)

case "$1" in
u*)
	set_relative_volume $volume $vol_incr $sink
;;
d*)
	set_relative_volume $volume -$vol_incr $sink
;;
m*)
	pactl set-sink-mute $sink toggle
;;
esac

hello, i'd like to be able to control volume with keyboard shortcuts on kde running 14.04 on my toshiba chromebook cb35. apparently, this is the script to use with crouton but i'm not sure how to implement it. do i just safe it as a file in my home directory and source it in .local?

There is an error:
File "volume", line 22
function set_relative_volume {
^
SyntaxError: invalid syntax

Any thoughts? Thanks!!

function set_relative_volume {
^
SyntaxError: invalid syntax

You saved the code as a py file and try to run it with python that's why the error.
Save it as volume.sh instead and run it with bash volume.sh
You can put this in the last row of the file so you will know if it runs or not.

echo "volume.sh script has finished"