#!/bin/bash
#
# $Id: ac32wav,v 1.1 Wed Oct 27 05:20:46 CEST 2004 stock Crk $
# (c) 2003,2004 Robert M. Stockmann <stock@stokkie,net>
#
# This is a AC3 to wav and mp3 ripping tool, which uses transcode.
# Packager    : Lenz Grimmer <lenz@grimmer.com>
# URL         : http://zebra.fh-weingarten.de/~transcode/
# Summary     : A linux video stream processing utility
# 
# Its of typical use when extracting digital audio from DVD movie disks
# to a wave or mp3 file. 4-channel wav audio is possible by changing
# inside the sox command -c 2 to -c 4 .
# 
# 

if [ "$1" = "" -a  "$2" = "" ]; then
	echo ""
	echo " Usage : $0 [basename] [audio-amplifier] "
	echo ""
	echo "A file [basename].ac3 should exist and is converted to "
	echo "[basename].wav. [audio-amplifier] is a number between "
	echo "0.0 and 10.0 and should of course be greater dan 0.0 "
	echo ""
	echo "To obtain the 5.1 Digital Dolby AC3 sound from a DVD-movie "
	echo "use the following command : "
	echo ""
	echo "   tcextract -i VTS_01_1.VOB -a 0 -x ac3 -t vob > [basename].ac3 "
	echo ""
	echo "wav to mp3 is typically performed with lame. For best results "
	echo "use LAME version 3.92 from (http://www.mp3dev.org/). Its "
	echo "rumoured that higher versions are of "lame" quality :) "
	echo "The following command should be used : "
	echo ""
	echo "   lame --quiet -h -b 192 [basename].wav [basename].mp3 "
	echo ""
	exit 0
fi


cat $1.ac3 | tcdecode -x ac3 -s $2,$2,$2 -d 4 |\
	sox -t raw -r 48000 -s -w -c 2 - -t wav $1.wav

exit 0