Purpose of this script is to monitor HDMI state on my Raspberry PI and start XBMC / Kodi when output is plugged in and terminate it when it is unplugged. It is tested with Raspbian distribution and XBMC / Kodi compiled from git.

hdmi-monitor.sh

#!/bin/bash

##            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
##                    Version 2, December 2004
## 
## Copyright (C) 2013 Lukáš Karas <lukas.karas@centrum.cz>
## 
## Everyone is permitted to copy and distribute verbatim or modified
## copies of this license document, and changing it is allowed as long
## as the name is changed.
## 
##             DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
##   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
## 
##  0. You just DO WHAT THE FUCK YOU WANT TO.
 
## Purpose of this script is to monitor HDMI state on my Raspberry PI 
## and start XBMC when output is plugged in and terminate it when 
## it is unplugged. 
## It is tested with Raspbian distribution and XBMC compiled from git.

HOME=/root/
cd $HOME
## for debug, print variables
env
echo

## https://github.com/raspberrypi/userland/blob/4062ce5b2492b4eae4bb9816a7a43c00f7a216de/interface/vmcs_host/vc_hdmi.h#L468
# typedef enum {
# 	VC_HDMI_UNPLUGGED          = (1 << 0),  /**<HDMI cable is detached */
# 	VC_HDMI_ATTACHED           = (1 << 1),  /**<HDMI cable is attached but not powered on */
# 	VC_HDMI_DVI                = (1 << 2),  /**<HDMI is on but in DVI mode (no audio) */
# 	VC_HDMI_HDMI               = (1 << 3),  /**<HDMI is on and HDMI mode is active */
# 	VC_HDMI_HDCP_UNAUTH        = (1 << 4),  /**<HDCP authentication is broken (e.g. Ri mismatched) or not active */
# 	VC_HDMI_HDCP_AUTH          = (1 << 5),  /**<HDCP is active */
# 	VC_HDMI_HDCP_KEY_DOWNLOAD  = (1 << 6),  /**<HDCP key download successful/fail */
# 	VC_HDMI_HDCP_SRM_DOWNLOAD  = (1 << 7),  /**<HDCP revocation list download successful/fail */
# 	VC_HDMI_CHANGING_MODE      = (1 << 8),  /**<HDMI is starting to change mode, clock has not yet been set */
# } VC_HDMI_NOTIFY_T;

function try_start_xbmc {
	echo "try start up xbmc"
	if [ `ps aux | grep -Pc "[x]bmc|[k]odi"` -gt 0 ] ; then
		echo "Xbmc is running already"
	else
		echo "switching to vt7, and clear it"
		chvt 7
		# hide cursor
		echo -e '\033[?17;0;0c' > /dev/tty7 2>/dev/null
		# clear it 
		echo -e '\x1b\x5b\x48\x1b\x5b\x32\x4a' > /dev/tty7 2>/dev/null
		#reset
		#clear
		#clear_console
		
		if [ -f /usr/lib/kodi/kodi.bin ] ; then
			LD_PRELOAD=/usr/lib/libtag.so /usr/lib/kodi/kodi.bin --debug 2>&1 &
		else
			LD_PRELOAD=/usr/lib/libtag.so /usr/lib/xbmc/xbmc.bin --debug 2>&1 &
		fi
		PID=`ps | grep -P "[x]bmc|[k]odi" | head -1 | awk '{print $1}'`
		echo "started xbmc ($PID)"
		cpufreq-set -g performance
	fi
}

function try_shutdown_xbmc {
	echo "try shutdown xbmc"
	echo "sending Application.Quit command to localhost 9090"
	echo '{"jsonrpc": "2.0", "method": "Application.Quit", "id": 1}' | netcat localhost  9090
	echo 
	
	chvt 1
	sleep 10
	cpufreq-set -g ondemand
	
	PID=`ps | grep -P "[x]bmc|[k]odi" | head -1 | awk '{print $1}'`
	if [ `ps $PID | grep -Pc "[x]bmc|[k]odi"` -eq 1 ] ; then
		echo "xbmc is still live, killing pid $PID"
		kill $PID
	fi
}

function hdmi_event {
	event=$1
	date +"%Y-%m-%d %H:%M:%S $event"
	state=`tvservice -s | awk '{print $2}'`
	echo "tvservice state: $state ($(( $state & 0x03 )))"
	if  [ $(( $state & 0x03 )) -eq $(( 0x02 )) ] ; then # attached
		try_start_xbmc
	fi
	if  [ $(( $state & 0x03 )) -eq $(( 0x01 )) ] ; then # unplugged
		try_shutdown_xbmc
	fi
	echo
}

hdmi_event "startup"

tvservice -M 2>&1 | while read event ; do 
	
	hdmi_event "$event"
done