#!/bin/bash

function usage()
{
	if [[ "$*" ]]; then
		echo "$*" >&2
	fi

	cat >&2 <<EOF
Usage: $(basename $0) OPTIONS FILE.mpeg
  --left          Add logo on left side
  --right         Add logo on right side
  --remove-audio  Remove audio stream from converted videos
EOF
	exit 1
}

function error()
{
	echo "$*" >&2
	exit 1
}


#######################################################################
left=0
right=0
remove_audio=0
mpeg=
while [[ "$1" ]]
do
	case "$1" in
	--left)
		left=1
		right=0
		shift
		;;
	--right)
		left=0
		right=1
		shift
		;;
	--remove-audio)
		remove_audio=1
		shift
		;;
	-*)
		usage "Unrecognized option $1"
		;;
	*)
		if [[ "$mpeg" ]]; then usage "Unexpected argument: $1"; fi
		mpeg=$1
		shift
		mext="${mpeg#*.}"
		if [[ "$mext" != 'mpeg' ]]; then error "Invalid mpeg file: $mpeg"; fi
		;;
	esac
done

if [[ ! "$mpeg" ]]; then usage; fi

geometry=$(file $mpeg | grep -P -o '\d+ x \d+' | tr -d ' ')
if   [[ $left -eq 1 ]]; then
	logo=logo-left-$geometry.jpg
elif [[ $right -eq 1 ]]; then
	logo=logo-right-$geometry.jpg
else
	error "Specify one of --left or --right"
fi

if [[ ! -f $logo ]]; then error "Logo file not found: $logo"; fi

if [[ $remove_audio -ne 0 ]]; then opts='-an'; fi

mp4=$(basename $mpeg .mpeg).mp4
ogv=$(basename $mpeg .mpeg).ogv

rm -f $mp4 $ogv
ffmpeg -sameq $opts -i $mpeg -vhook "/usr/lib64/vhook/watermark.so -f $logo" $mp4
ffmpeg -sameq $opts -i $mp4 $ogv


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