RandomVideo/buzzer.sh

#!/bin/sh
# SPDX-License-Identifier: Unlicense

configfile="config.json"

cmdjq="$(command -v jq)"
if [ -z "$cmdjq" ]; then
	echo "Missing \"jq\"!"
	exit 1
fi

cmdgpio="$(command -v gpio)"
if [ -z "$cmdgpio" ]; then
	echo "Missing \"gpio\"!"
	echo "This is a part of WiringPi-Package."
	exit 1
fi

player="$($cmdjq -r ".player" < $configfile)"
if [ -z "$(command -v $player)" ]; then
	echo "Missing \"$player\"!"
	exit 1
fi

buzzergpio="$($cmdjq -r ".buzzer | .buzzergpio" < $configfile)"
strobegpio="$($cmdjq -r ".buzzer | .strobegpio" < $configfile)"
swupgpio="$($cmdjq -r ".swupgpio"  < $configfile)"
swdowngpio="$($cmdjq -r ".buzzer | .swdowngpio" < $configfile)"

playerparam="$($cmdjq -r ".playerparam" < $configfile)"
playerloop="$($cmdjq -r ".buzzer | .playerloop" < $configfile)"

pgrepplayer="$($cmdjq -r ".pgrepplayer" < $configfile)"

pollingtime="$($cmdjq -r ".buzzer | .pollingtime" < $configfile)"
buzzertimeout="$($cmdjq -r ".buzzer | .buzzertimeout" < $configfile)"
strobeduration="$($cmdjq -r ".buzzer | .strobeduration" < $configfile)"

volumetimeout="$($cmdjq -r ".buzzer | .volumetimeout" < $configfile)"
volumedelay="$($cmdjq -r ".buzzer | .volumedelay" < $configfile)"
volumemax="$($cmdjq -r ".buzzer | .volumemax" < $configfile)"

playerfull="$(command -v $player) $playerparam"
cmdamixer="$(command -v amixer)"

$cmdgpio mode $buzzergpio in

$cmdgpio mode $strobegpio out
$cmdgpio write $strobegpio 1

$cmdgpio mode $swdowngpio in
$cmdgpio mode $swupgpio in

volumevalue=0
$cmdamixer -q -c 2 sset 'Speaker' $volumevalue%

while true; do

	buzzerstat="$($cmdgpio read $buzzergpio)"
	swupstat="$($cmdgpio read $swupgpio)"
	swdownstat="$($cmdgpio read $swdowngpio)"
	
	if [ "$buzzerstat" -eq 0 ] && [ "$swupstat" -eq 0 ]; then
		~/RandomVideo/RandomVideo.sh buzzer
		$cmdgpio write $strobegpio 0; sleep $strobeduration; $cmdgpio write $strobegpio 1 &
		sleep $buzzertimeout

	elif [ "$swupstat" -eq 1 ]; then

		if pgrep "$pgrepplayer" > /dev/null; then
               		pkill "$pgrepplayer"
		fi

		$playerfull $playerloop ~/RandomVideo/onair.mp4 &

		while [ "$swupstat" -eq 1 ]; do
			swupstat="$($cmdgpio read $swupgpio)"
			sleep $pollingtime
		done

               	pkill "$pgrepplayer"

	elif [ "$volumevalue" -eq 0 ] && [ "$swdownstat" -eq 1 ]; then
		
		while [ "$volumevalue" -lt "$volumemax" ] && [ "$buzzerstat" -eq 1 ]; do
			volumevalue=$((volumevalue + 1))
			$cmdamixer -q -c 2 sset 'Speaker' $volumevalue%
			buzzerstat="$($cmdgpio read $buzzergpio)"
			sleep $volumetimeout
		done
		
		sleep $volumedelay

	elif [ "$volumevalue" -gt 0 ] && [ "$swdownstat" -eq 0 ]; then

		while [ "$volumevalue" -gt 0 ] && [ "$swdownstat" -eq 0 ]; do
			volumevalue=$((volumevalue -1))
			$cmdamixer -q -c 2 sset 'Speaker' $volumevalue%
			swdownstat="$($cmdgpio read $swdowngpio)"
			sleep $volumetimeout
		done

		sleep $volumedelay

	elif [ "$buzzerstat" -eq 1 ] && [ "$swupstat" -eq 0 ]; then
		sleep $pollingtime

	fi

done