A script to fade volume when toggling MPD via mpc

mpd-fade

#!/bin/sh

# A script to fade volume when toggling MPD via mpc

mpc=`which mpc`

# volume commands, customize here
decrease="amixer -q set Master 1%-"
increase="amixer -q set Master 1%+"

if [ $# -ne 2 ] ; then
   echo "usage: mpc-fade <volume fade percentage> <fade length in secs>"
   # example: $ mpc-fade 20 4
   exit 1
fi

VOLUME=$1

fade() {
    while [ $VOLUME -ge 0 ] ; do
        $1
        VOLUME=$(($VOLUME-1))
        sleep .1 # 0.1 seconds
    done
}

playing=$(mpc status | grep playing)

if [ ${#playing} -gt 0 ] ; then
    fade "$decrease"
    mpc toggle -q
else
    mpc toggle -q
    fade "$increase"
fi

exit 0

# eof

https://gist.github.com/Pablo1107/1d61cfa39e683289d96301230bf88fa5

This also sets volume to current volume so the fade out always goes to 0 and you can pass an argument to set in how many seconds it fade out, the only bug is that always add 2 seconds for some reason. ¯\_(ツ)_/¯