screenshot_functions.sh

function MAIN_SCREENSHOT_FUNCTION {
	echo "================== SCREENSHOT (tty5) ==========================="
	echo
	
	# only run screenshot function if cam found and screenshots are enabled
	if [ "$CAM" == "0" ] && [ "$ENABLE_SCREENSHOTS" == "Y" ]; then
	    echo "Waiting some time until everything else is running ..."
	    
		sleep 20
		
	    echo "Screenshots enabled - starting screenshot function ..."
		
	    screenshot_function
	fi
	
	echo "Screenshots not enabled in configfile or we are TX"
	
	sleep 365d
}

function screenshot_function {
    while true; do
		# pause loop while saving is in progress
		pause_while
		
		SCALIVE=`nice /home/pi/wifibroadcast-base/check_alive`
		LIMITFREE=3000 # 3 mbyte
		
		# do nothing if no video being received (so we don't take unnecessary screeshots)
		if [ "$SCALIVE" == "1" ]; then
			# check if tmp disk is full, if yes, do not save screenshot
			FREETMPSPACE=`df -P /wbc_tmp/ | awk 'NR==2 {print $4}'`
			
			if [ $FREETMPSPACE -gt $LIMITFREE ]; then
				PNG_NAME=/wbc_tmp/screenshot`ls /wbc_tmp/screenshot* | wc -l`.png
			
				echo "Taking screenshot: $PNG_NAME"
				
				ionice -c 3 nice -n 19 /home/pi/wifibroadcast-misc/raspi2png -p $PNG_NAME
			else
				echo "RAM disk full - no screenshot taken ..."
			fi
		else
			echo "Video not running - no screenshot taken ..."
		fi
		
		sleep 5
    done
}