Here is a shell script that takes input from the mouse scroll wheel to
change the volume of the named local player. I wrote it with a view to
hacking a Poundland mouse plus rotary encoder to put a real volume knob
on my LMS / Squeezebox computer. I would welcome any comments or
suggestions.
Code:
--------------------
#!/bin/bash
#use command - xinput - to find id of mouse who's scroll wheel you want to use
mouseID=10
player='Dining Room'
IP="127.0.0.1 9090"
#Need to convert player name to mac address
#find number of players
nplayers=$(echo "player count ?" | nc -q1 $IP | tail -c 2 )
n=0
#loop through players to determine mac address of player
while [ $n -lt $nplayers ]
do
pmac=$(echo "player id $n ?" | nc -q1 $IP | tail -c 28 | sed -r
's/%3A/:/g' )
pname=$(echo "player name $n ?" | nc -q1 $IP | cut -c 15- | sed
-r 's/%20/ /g')
if [ "$pname" = "$player" ]; then
playerID=$pmac
echo
echo "$pname" "$pmac"
fi
n=$(($n + 1))
done
echo
OldScroll=$(xinput --query-state $mouseID | grep 'valuator\[2\]\=' | cut -c
14-)
echo "Initial wheel position: $OldScroll"
playerVOL=$(printf "$playerID mixer volume ?\nexit\n" | nc $IP | tail -c 3 |
tr -dc '0-9')
echo "Initial Volume: $playerVOL"
echo
# Infinite loop checks to see if mouse scroll wheel has turned and in which
direction - Ctrl C to quit
while :
do
scroll=$(xinput --query-state $mouseID | grep 'valuator\[2\]\=' | cut -c 14-)
if [ $OldScroll -gt $scroll ]; then
playerVOL=$(printf "$playerID mixer volume ?\nexit\n" | nc $IP | tail
-c 3 | tr -dc '0-9')
setVOL=`expr $playerVOL + 5`
printf "$playerID mixer volume $setVOL\nexit\n" | nc $IP
fi
if [ $scroll -gt $OldScroll ]; then
playerVOL=$(printf "$playerID mixer volume ?\nexit\n" | nc $IP | tail
-c 3 | tr -dc '0-9')
setVOL=`expr $playerVOL - 5`
printf "$playerID mixer volume $setVOL\nexit\n" | nc $IP
fi
OldScroll=$scroll
sleep 0.2
done
--------------------
------------------------------------------------------------------------
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