ac3dec - a free AC-3 stream decoderWritten by Aaron Holtzman (aholtzma@engr.uvic.ca)Contributors:  Michael Holzt <kju@flummi.de>See the file COPYING for license details.The currently supported platforms are Linux and Solaris. If you wantsupport for other plaforms, take a look at output_*.c for an ideaof what you need to do.This software is completely useless to 99.99 percent of usersout there. It is mostly of use to those interested in audiocoding research and evaluating codecs. It could theoreticallybe used as a portion of a DVD playback system for unix systems. There are issues with DVD encryption and licensing that need to beresolved however.HOW TO COMPILEBuilding ac3dec should be easy. Here's how:./configure && make allUSAGETo find AC-3 streams on the internet, use www.google.com and search for "vob trailer". A vob is a "Video Object" which isjust an MPEG-2 stream. The site www.hollywood.com has a few good MPEG-2s with AC-3 audio. The program tools/extract_ac3 will take an MPEG-2 stream and spit out AC-3 audio to stdout ifit exists. You can easily pipe this data to the ac3 player likethis:  ./tools/extract_ac3 foo.vob | ./decodeDEBUG OUTPUTYou can get a whole pile of debug info by setting the environmentvariable AC3_DEBUG=1. Be sure to pipe stderr to a file or you probablywon't get realtime playback. You can pipe stderr to a file like so:  ./decode foo.ac3 2> debug.out