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ac3dec - a free AC-3 stream decoder

Written by Aaron Holtzman (aholtzma@engr.uvic.ca)

Contributors:
  Michael Holzt <kju@flummi.de> - OSS output.c and misc errata
	Jim Miller <jmiller@heli.engr.sgi.com> - IRIX output.c
	Angelos Keromytis <angelos@dsl.cis.upenn.edu> - OpenBSD fixes
	Don Mahurin <dmahurin@dma.org> - stdin support for extract_ac3
	Takefumi SAYO <stake@niagara.shiojiri.ne.jp> - FreeBSD tweak
	Charles M. Hannum <root@ihack.net> - fixes


See the file COPYING for license details.

The currently supported platforms are Linux, Solaris, IRIX, OpenBSD, and
FreeBSD. If you want support for other platforms, take a look at 
output_*.c for an idea of what you need to do.

This software is completely useless to 99.99 percent of users
out there. It is mostly of use to those interested in audio
coding research and evaluating codecs. It could theoretically
be used as a portion of a DVD playback system for unix systems. 

HOW TO COMPILE

Building ac3dec should be easy. Here's how:

./configure && make all

USAGE

To find AC-3 streams on the internet, use www.google.com and 
search for "vob trailer". A vob is a "Video Object" which is
just 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 if
it exists. You can easily pipe this data to the ac3 player like
this:

  ./tools/extract_ac3 foo.vob | ./ac3dec/

You can also get AC-3 streams on a DVD. Check out 
http://www.linuxvideo.org for details.

DEBUG OUTPUT

You can get a whole pile of debug info by setting the environment
variable AC3_DEBUG=1. Be sure to pipe stderr to a file or you probably
won't get realtime playback. You can pipe stderr to a file like so:

  ./ac3dec foo.ac3 2> debug.out

 Name                                                                   Last modified      Size  
 Parent Directory                                                                            -   
 libac3/                                                                05-Feb-2008 10:25    -   
 test/                                                                  05-Feb-2008 10:25    -   
 tools/                                                                 05-Feb-2008 10:25    -   
 COPYING                                                                05-Feb-2008 10:25   18K  
 Changelog                                                              05-Feb-2008 10:25  2.5K  
 Makefile.am                                                            05-Feb-2008 10:25  503   
 Makefile.in                                                            05-Feb-2008 10:25   22K  
 README                                                                 05-Feb-2008 10:25  1.8K  
 TODO                                                                   05-Feb-2008 10:25  1.0K  
 ac3dec.c                                                               05-Feb-2008 10:25  5.9K  
 ac3spdif.c                                                             05-Feb-2008 10:25  4.3K  
 aclocal.m4                                                             05-Feb-2008 10:25   36K  
 autogen.sh                                                             05-Feb-2008 10:25  1.5K  
 config.guess                                                           05-Feb-2008 10:25   43K  
 config.h.in                                                            05-Feb-2008 10:25  1.6K  
 config.sub                                                             05-Feb-2008 10:25   32K  
 configure                                                              05-Feb-2008 10:25  173K  
 configure.in                                                           05-Feb-2008 10:25  846   
 depcomp                                                                05-Feb-2008 10:25   16K  
 install-sh                                                             05-Feb-2008 10:25  9.0K  
 missing                                                                05-Feb-2008 10:25   11K  
 output.c                                                               05-Feb-2008 10:25  5.8K  
 output.h                                                               05-Feb-2008 10:25  1.2K  
 plot_spectrum.m                                                        05-Feb-2008 10:25  323   

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