dvd2vob

#!/usr/bin/env zsh
#
# dvd2vob
#    Reads out a DVD and dumps the content to a .vob file.
#

# helper functions
usage() {
	echo
	echo "Usage: $1 [Device] [Track-ID] [Output file]"
	echo "   Device = DVD device, should be either the symlink /dev/dvd"
	echo "   or something matching /dev/sr?"
	echo "   Track-ID = ID of the track that contains the movie. Use lsdvd to find it."
	echo "   Output file = File, where the dump is saved to. Should have .vob suffix."
	echo
}
exit_usage() {
	usage $1
	exit 1
}
exit_file_exists() {
	echo "dvd2vob: ERROR: Output file \"$1\" alreaddy exists! Aborting." >&2
	exit 1
}
exit_mplayer_unavailable() {
	echo "dvd2vob: FATAL: mplayer not in PATH." >&2
	exit 1
}

# Check arguments
[ $# -eq 3 ] || exit_usage $0        # test if 3 arguments are passed
[ -b "$1" ] || exit_usage $0         # test if device really is a block special device
[ ! -e "$3" ] || exit_file_exists $3 # test it output file is not already there

# check if mplayer is available
which mplayer &>/dev/null || exit_mplayer_unavailable

# set up environment
DEVICE=$1
TRACK=$2
OUTPUT=$3

# if everything is correct, tell the user that that this could take a while,
# and give him a chance to abort it.
echo "dvd2vob: everything fine."
if [ "$RUNCONTEXT" \== "dvdrip" ]; then
	true
else
	echo "Everything looks fine, and therefore dvd2vob is"
	echo "ready to start dumping."
	echo 
	echo "Overview of what should be done:"
	echo " Device where the DVD disk is:"
	echo "  -> $DEVICE"
	echo "ID of the DVD track to dump:"
	echo "  -> $TRACK"
	echo "Output file name:"
	echo "  -> $OUTPUT"
	echo
	echo "The actual dump can take a long time. This is the last"
	echo "chance to abort the dump. Press Ctrl+C to abort,"
	echo "otherwise, press ENTER to continue."
	echo 
	read
fi

# start actual dump
echo "dvd2vob: Starting dump."
if [ "$RUNCONTEXT" \== "dvdrip" ]; then
	mplayer dvd://$TRACK -dvd-device $DEVICE -dumpstream -dumpfile $OUTPUT >/dev/null || exit 1
else
	mplayer dvd://$TRACK -dvd-device $DEVICE -dumpstream -dumpfile $OUTPUT || exit 1
fi
echo "dvd2vob: done."