does a range of preparations, and then runs skype

sdmskype

#!/bin/bash 

# this program sets up skype to run on linux without pulseaudio
#
# already running. There are two options:
# 1.  run pulseaudio just before skype, then kill it when finished with skype
# 2.  use the apulse library to fool skype into thinking that there is pulse audio.
# 	  apulse relies on alsa - it just passes pulseaudio commands through to ALSA


# requirements: 
# xmessage (or some other messaging program)
# 
# if using pulseaudio:
# 		 pulseaudio (unless setting USE_REAL_PULSE to 0)
# 		 			(i.e. no '1' is passed to this script)
# 		 pavucontrol (iff using pulseaudio) (optional)
#		 
# if not using pulseaudio
# 		apulse, downloadable as 'apulse-master' from https://github.com/i-rinat/apulse
#		qasmixer (optional)
#		gksu (optional - the v4l2usp must be run as root: sudo will NOT do. )



# ----- parapmeters ----------------------------------

# read the single parameter: '1' means 'use the real pulseaudio'
USE_REAL_PULSE=0
if [[ "x$1" == "xpulse" ]]
then
	USE_REAL_PULSE=1
elif [[ "x$1" != "x" ]]
then
	xmessage "corrupt parameter ($1) to sdmskype";
	exit ;
fi



# ----- preparations  ---------------------------

# this blocks until dismissed
xmessage "Connect the webcam (if you want to)"

# if NOT using pulseaudio:
if [[ "x$USE_REAL_PULSE" == "x0" ]]
then
	# currently, with just alsa, alsa.conf
	# I cannot get the dmix bit to work, so can
	# only have one sound app running at one time
	# (multiple sound apps is the SOLE benefit of 
	# pulseaudio)

	xmessage "about to kill iceweasel and audacious"

	# currently 2015-11-18 only one program can use non-pulse sound
	killall audacious
	#killall firefox

	# the preload is for the update to skype 2014-09-09 or earlier
	# to make the video camera work
	export LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l1compat.so

	# these are the libraries to fool skype into thinking that it is running
	# pulseaudio
	# this is a separate directory for the 'apulse' libraries
	export LD_LIBRARY_PATH=/usr/lib/i386-linux-gnu/sdm_pulseRemoveLibs:$LD_LIBRARY_PATH 
fi








# ----- support programs ------------------------

if [[ $USE_REAL_PULSE == "1" ]]
then

	PULSE_ALREADYRUNNING=`sudo pidof pulseaudio`
	if [[ "x$PULSE_ALREADYRUNNING" == "x" ]]		
	then

		echo "==== Starting pulseaudio ==="

		# remove stale pids and shit
		rm -fr /run/user/1000/pulse
		rm -fr /run/shm/pulse-shm-*
		#NO: fucks the sound: export PULSE_LATENCY_MSEC=30 
		urxvt -g 200x100 -title "pulseaudio messages" -hold -e bash -c 'pulseaudio -vvvvv'  &
		pulseaudio_terminal_pid=$!

		sleep 3
	fi

	# pavucontrol &
	# pavucontrol_pid=$!
	killall xaumix;
	xaumix &

	sleep 3

	export QT_GRAPHICSSYSTEM="native" 
	export QT_X11_NO_MITSHM=1
	gksu v4l2ucp &
	v412ucp_pid=$!

	sleep 3 

else  # [[ "$USE_REAL_PULSE" == '0' ]]
	qasmixer &
	qasmixer_pid=$!

	sleep 10

	export QT_GRAPHICSSYSTEM="native" 
	export QT_X11_NO_MITSHM=1
	gksu v4l2ucp &
	v412ucp_pid=$!

	sleep 10
fi






# ----- now run skype --------------------------
export QT_GRAPHICSSYSTEM="native" 
export QT_X11_NO_MITSHM=1
/usr/bin/skype &
skype_pid=$!






# ----- killing skype when done ----------------

sleep 5;
echo
echo "**********************************"
echo "Type \"done\" when done with skype"
echo "**********************************"
echo

ENDSTRING="aaa";
while [[ "$ENDSTRING" != "done" ]]
do 
	aumix -i 100 ; 		# capture
#	aumix -m 100 ;		# mic playback, not capture
	sleep 0.5 ; 

	read -t 0.5 ENDSTRING ;
done 

kill $skype_pid

# mute the microphone now we are done
aumix -i 0;








# ----- clean-up now skype has finished -----------------------

if [[ $USE_REAL_PULSE == "1" ]]
then
	if [[ "x$PULSE_ALREADYRUNNING" == "x" ]]
	then
		kill $pulseaudio_terminal_pid;
		/usr/bin/killall -q  pulseaudio
	fi
	sudo /usr/bin/killall -q v4l2ucp
	sudo /usr/bin/killall -q "rtkit-daemon"
	sudo /usr/bin/killall -q timidity
	sleep 1
	if [[ "x$PULSE_ALREADYRUNNING" == "x" ]]
	then
		/usr/bin/killall -q -9  pulseaudio
		sudo rm -fr /tmp/pulse*
	fi
	sudo /usr/bin/killall -q -9 v4l2ucp
	sudo /usr/bin/killall -q -9 "rtkit-daemon"
	sudo /usr/bin/killall -q -9 timidity
	sudo rm -fr /tmp/skype*
else
	kill $qasmixer_pid;
	sudo /usr/bin/killall -q v4l2ucp
fi