#!/bin/sh
#
# Trancode NUV to DVD compliant MPEG2 (PAL or NTSC)
#
 
usage(){
    echo "Usage: `basename $0` [-h] | [-N] [-G WxH] nuvfile"
    echo
    echo "  -N   Set TV norm to NTSC (default: PAL)"
    echo
    echo "  -G   Set output geometry (Width x Height)"
    echo "       Admissible scales:"
    echo "       +---------------------------------------+"
    echo "       | PAL               | NTSC              |"
    echo "       +---------------------------------------+"
    echo "       | 352x288 (default) | 352x240 (default) |"
    echo "       | 352x576           | 352x480           |"
    echo "       | 704x576           | 704x480           |"
    echo "       | 720x576           | 720x480           |"
    echo "       +---------------------------------------+"
}

args=`getopt hNG: $*`
if [ $? != 0 ]; then
    usage
    exit 1
fi
set -- $args

for i ; do
    case "$i" in
	-h)
	usage
	exit 1
	;;
	-N)
	tvnorm="NTSC"
	shift
	;;
	-G) 
	scale="$2" 
	shift ; shift
	;;
	--) shift ; break
	;;
    esac
done

if [ "$tvnorm" = "NTSC" ]; then
    res="352x240"
else
    res="352x288"
    tvnorm="PAL"
fi

if [ "$scale" ]; then
    case $tvnorm in
	PAL)
	case $scale in
	    352x288|352x576|704x576|720x576) res=$scale
	    ;;
	    *) 
	    echo "Scale \"$scale\" is not admissible for $tvnorm." >&2
	    exit 1
	    ;;
	esac
	;;
	NTSC)
	case $scale in
	    352x240|352x480|704x480|720x480) res=$scale
	    ;;
	    *) 
	    echo "Scale \"$scale\" is not admissible for $tvnorm." >&2
	    exit 1
	    ;;
	esac
	;;
    esac
fi

# Allow to specify the input filename
# with or without the .nuv extension.
movie=""
[ "${1%.*}.nuv" = "$1" ] && movie=${1%.*}
[ "$movie" ] || movie=$1
if [ "$movie" -a ! -e $movie.nuv ]; then
    echo "No such file: $movie.nuv" >&2
    exit 1
elif [ -z "$movie" ]; then
    usage
    exit 1
fi

# We need nuvplay (provided by nuppelvideo), lame, as well as
# mpeg2enc and mplex (provided by mjpegtools) for transcoding.
retval=0
for PROG in nuvplay lame mpeg2enc mplex ; do
    which -s $PROG || retval=$?
    if [ $retval -ne 0 ]; then
	echo "Error: could't find '$PROG' on this system." >&2
	exit 1
    fi
done

nuvplay -e $movie.nuv | lame -s 44.1 -b 192 -q 2 -rx - $movie.mp3
exportvideo -Y 2 -G $res $movie.nuv | mpeg2enc -f 8 -o $movie.m2v
mplex -f 8 -o ${movie}_%d.mpg $movie.m2v $movie.mp3

exit 0