X-Git-Url: http://git.cinelerra-gg.org/git/?a=blobdiff_plain;f=cinelerra-5.0%2Flibzmpeg3%2Fa52dec-0.7.3%2FREADME;fp=cinelerra-5.0%2Flibzmpeg3%2Fa52dec-0.7.3%2FREADME;h=0000000000000000000000000000000000000000;hb=30bdb85eb33a8ee7ba675038a86c6be59c43d7bd;hp=9865a17e622b76ae494a1d608a307a1d50122932;hpb=52fcc46226f9df46f9ce9d0566dc568455a7db0b;p=goodguy%2Fhistory.git diff --git a/cinelerra-5.0/libzmpeg3/a52dec-0.7.3/README b/cinelerra-5.0/libzmpeg3/a52dec-0.7.3/README deleted file mode 100644 index 9865a17e..00000000 --- a/cinelerra-5.0/libzmpeg3/a52dec-0.7.3/README +++ /dev/null @@ -1,177 +0,0 @@ - - -ABOUT LIBA52 - -liba52 is a free library for decoding ATSC A/52 streams. It is -released under the terms of the GPL license. The A/52 standard is used -in a variety of applications, including digital television and DVD. It -is also known as AC-3. - -The main goals in liba52 development are: - - * Portability - Currently all of the code is written in C, and - when we write platform-specific optimizations we will always - keep a generic C routine to fall back on. - - * Reuseability - we do not want liba52 to include any - project-specific code, but it should still include enough - features to be used by very diverse projects. - - * Precision - We are trying to implement all of the A/52 - standard, and to have a very precise output by doing all the - calculations in floating point. We have a test suite that - detects any deviation in the output when compared to previous - versions. We do not have access to official A/52 test vectors - though, so we have to use our judgement to ensure that such - deviations are only intruduced when we fix bugs ! - - * Speed - liba52 is really fast, on any modern PC it should take - only a few percent of CPU time. - -The project homepage is at http://liba52.sourceforge.net/ - - -A52DEC - -a52dec is a test program for liba52. It decodes ATSC A/52 streams, and -also includes a demultiplexer for mpeg-1 and mpeg-2 program streams. - -The liba52 source code is always distributed in the a52dec package, to -make sure it easier for people to test it. - -The basic usage is to just type "a52dec file" where file is an ATSC -A/52 file. - -The "-s" option must be used for multiplexed (audio and video) mpeg-2 -files. These files are usualy found on the internet or on unencrypted -DVDs. - -The "-o" option is used to select a given output layer. By default -a52dec does a stereo downmix and outputs to your speakers, but you can -try other choices using this option. This is also used for performance -testing and conformance testing. - -The "-c" option is used to disable all optimizations (currently only djbfft). - -The "-r" option is used to disable the dynamic range compression. - - -OTHER PROJECTS USING LIBA52 - -liba52 (and its ancestor libac3) is being used by various other -projects, including: - - * xine (http://xine.sourceforge.net/) - started as a simple - mpeg-2 audio and video decoder, but it since became a - full-featured DVD and video media player. - - * MPlayer (http://www.MPlayerHQ.hu) - another good player, it is - also very robust against damaged streams. - - * movietime (http://movietime.sourceforge.net/) - still quite - young, but it looks very promising ! - - * ffmpeg (http://ffmpeg.sourceforge.net/) - a nice audio/video - encoder and transcoder, uses liba52 for decoding A/52 streams. - - * Ogle (http://www.dtek.chalmers.se/groups/dvd/) - a good DVD - player with menu support - - * OMS (http://www.linuxvideo.org/oms/) - - * XMPS (http://xmps.sourceforge.net/) - - * GStreamer (http://www.gstreamer.net/) - a framework for - streaming media; it has an A/52 decoding plugin based on liba52. - - * mpeglib (http://mpeglib.sourceforge.net/) - a video decoding - library that usess liba52 when decoding A/52 streams. - -If you use liba52 in another project, let us know ! - -VideoLAN (http://www.videolan.org/) does not use liba52, but this is -still a cool project :) - - -TASKS - -There are several places where we could easily use some help: - - * Web design: This site sucks ! at the very least, we'd like to - come up with a nicer background picture and a logo. - - * Testing: If you find any stream that does not decode right - with liba52, let us know ! The best thing would be to mail to - the liba52-devel mailing list. Also if you have access to - encoders, we'd love to get test streams that would be free of - rights - so that we can put them on this server. - - * Coding: you can have a look in the TODO file first ! The most - important item is probably to make the code fully reentrant. - - * Porting: If you're porting to a new architecture, you might - want to experiment with the compile flags defined in - configure.in . When you figure out whats fastest on your - platform, send us a patch ! - - -REFERENCES - -The A/52 standard is publically available at these locations: - - * http://www.atsc.org/standards/a_52a.pdf - The main part of the - standard, as published by the ATSC. - - * http://www.dolby.com/tech/ATSC_err.pdf - A list of erratas in - the ATSC standard, published by Dolby. It applies to the - previous revision of the standard (A/52 not A/52a), but some - erratas have not been fixed in the updated standard yet ! - - -CVS SNAPSHOTS - -A daily snapshot is created using "make distcheck" every night and -uploaded to http://liba52.sourceforge.net/files/a52dec-snapshot.tar.gz . -It is easier to use than the CVS repository, because you do not need -to have the right versions of automake, autoconf and libtool -installed. It might be convenient when working on a liba52 port for -example. - - -CVS REPOSITORY - -The latest liba52 and a52dec source code can always be found by -anonymous CVS: - -# export CVSROOT=:pserver:anonymous@cvs.liba52.sourceforge.net:/cvsroot/liba52 -# cvs login (Just press Return when prompted for a password) -# cvs checkout a52dec - -You can also browse the latest changes online at -http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/liba52/a52dec/ - -The other CVS modules are ac3dec-livid for the CVS history of the -project while it was still hosted on the linuxvideo.org servers, and -ac3dec for the CVS history of the project while the linuxvideo.org -servers were down and before the library switched its name to liba52. - - -MAILING LISTS - -See the subscription information at http://liba52.sourceforge.net/lists.html - -liba52-devel - -This is the main mailing list for technical discussion about -liba52. Anyone wanting to work on liba52, or maybe just stay informed -about the development process, should probably subscribe to this list. - -liba52-checkins - -All liba52 checkins are announced there. This is a good way to keep -track of what goes into CVS. - -liba52-announce - -This is a very low traffic mailing list, only for announcements of new -versions of liba52. Only project administrators can post there.