#!/bin/bash

i=$1 
rm -f $i-*.avi

if [ -z $2 ] ; then
	WIDTH=$(ffmpeg/ffprobe -show_streams $i | grep width | awk -F= '{ print $2}')
else 
	WIDTH=$2
fi

if [ -z $3 ] ; then
	HEIGHT=$(ffmpeg/ffprobe -show_streams $i | grep height | awk -F= '{ print $2}')
else
	HEIGHT=$3
fi

# screens are 41x31 with a 4cm gap
CROPWIDTH=$(expr $WIDTH '*' 41 / 132)
CROPHEIGHT=$(expr $HEIGHT '*' 31 / 66)

XOFFSET=$(expr $WIDTH '*' 4 / 132)
YOFFSET=$(expr $WIDTH '*' 4 / 66)

echo "$WIDTH:$HEIGHT:$CROPWIDTH:$CROPHEIGHT"

if [ $WIDTH -lt $(expr $HEIGHT '*' 2) ] ; then
	echo "pad left and right"
	HPAD=$(expr $HEIGHT - $WIDTH / 2)
	#pad=width:height:x:y:black
	#tl pad=$(expr $HPAD + CROPWIDTH):$CROPHEIGHT:$HPAD:0:black
	#bl pad=$(expr $HPAD + CROPWIDTH):$CROPHEIGHT:$HPAD:0:black
	#tr pad=$(expr $HPAD + CROPWIDTH):$CROPHEIGHT:0:0:black
	#br pad=$(expr $HPAD + CROPWIDTH):$CROPHEIGHT:0:0:black
	echo ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:0:0","pad=$(expr $HPAD + $CROPWIDTH):$CROPHEIGHT:$HPAD:0:black" $i-tl.avi
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:0:0","pad=$(expr $HPAD + $CROPWIDTH):$CROPHEIGHT:$HPAD:0:black" $i-tl.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr $CROPWIDTH + $XOFFSET):0" $i-tm.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr \( $CROPWIDTH + $XOFFSET \) '*' 2):0","pad=$(expr $HPAD + $CROPWIDTH):$CROPHEIGHT:0:0:black" $i-tr.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:0:$(expr $CROPHEIGHT + $YOFFSET)","pad=$(expr $HPAD + $CROPWIDTH):$CROPHEIGHT:$HPAD:0:black" $i-bl.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr $CROPWIDTH + $XOFFSET):$(expr $CROPHEIGHT + $YOFFSET)" $i-bm.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr \( $CROPWIDTH + $XOFFSET \) '*' 2):$(expr $CROPHEIGHT + $YOFFSET)","pad=$(expr $HPAD + $CROPWIDTH):$CROPHEIGHT:0:0:black" $i-br.avi &

else
	echo "pad top and bottom"
	VPAD=$(expr $WIDTH / 4 - $HEIGHT / 2)
	#tl "pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:$VPAD:black" 
	#bl "pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:0:black"
	echo ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:0:0","pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:$VPAD:black" $i-tl.avi
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:0:0","pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:$VPAD:black" $i-tl.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr $CROPWIDTH + $XOFFSET):0","pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:$VPAD:black" $i-tm.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr \( $CROPWIDTH + $XOFFSET \) '*' 2):0","pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:$VPAD:black" $i-tr.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:0:$(expr $CROPHEIGHT + $YOFFSET)","pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:0:black" $i-bl.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr $CROPWIDTH + $XOFFSET):$(expr $CROPHEIGHT + $YOFFSET)","pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:0:black" $i-bm.avi &
	ffmpeg/ffmpeg -qscale 3 -an -i $i -vf "crop=$CROPWIDTH:$CROPHEIGHT:$(expr \( $CROPWIDTH + $XOFFSET \) '*' 2):$(expr $CROPHEIGHT + $YOFFSET)","pad=$CROPWIDTH:$(expr $CROPHEIGHT + $VPAD):0:0:black" $i-br.avi &
fi