#!/bin/sh
#
# Author: Örjan Persson <orange@fobie.net>
#
# Toggle the 'External Amplifier', useful to bind to a mute/unmute
# button found on some keyboards. (eg HP nc8000)
# 
# What's so special about that, you ask? A normal mute  works, but
# using the 'External Amplifier' toggles a red led on my laptop
# that indicates that sound is off.
#
# I mute PCM and Headphone instead of Master here. This is because
# if you use the gnome-volume-control, it will automatically set
# master volume to 0 if you mute master. (Volume lost when unmute.)

# Card number to control. ('hw:N' where N is the number)
CARD=0

EXTAMP=`amixer -c $CARD sget 'External Amplifier' \
        | grep 'Playback \[' | cut -d ' ' -f 5`

if [ "$EXTAMP" == "[on]" ];then
    amixer -c $CARD sset 'External Amplifier' off > /dev/null
    #amixer -c $CARD sset 'Master' unmute > /dev/null
    amixer -c $CARD sset 'PCM' mute > /dev/null
    amixer -c $CARD sset 'Headphone' mute > /dev/null
else
    amixer -c $CARD sset 'External Amplifier' on > /dev/null
    #amixer -c $CARD sset 'Master' unmute > /dev/null
    amixer -c $CARD sset 'PCM' unmute > /dev/null
    amixer -c $CARD sset 'Headphone' unmute > /dev/null
fi