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1
2
3ABOUT LIBMPEG2
4
5libmpeg2 is a free library for decoding mpeg-2 and mpeg-1 video
6streams. It is released under the terms of the GPL license.
7
8The main goals in libmpeg2 development are:
9
10 * Conformance - libmpeg2 is able to decode all mpeg streams that
11 conform to certain restrictions: "constrained parameters" for
12 mpeg-1, and "main profile" for mpeg-2. In practice, this is
13 what most people are using. For streams that follow these
14 restrictions, we believe libmpeg2 is 100% conformant to the
15 mpeg standards - and we have a pretty extensive test suite to
16 check this.
17
18 * Speed - there has been huge efforts there, and we believe
19 libmpeg2 is the fastest library around for what it
20 does. Please tell us if you find a faster one ! With typical
21 video streams as found on DVD's, and doing only decoding with
22 no display, you should be able to get about 110 fps on a
23 PIII/666, or 150 fps on an Athlon/950. This is less than 20
24 cycles per output pixel. In a real player program, the display
25 routines will probably take as much time as the actual
26 decoding !
27
28 * Portability - most of the code is written in C, and when we
29 use platform-specific optimizations (typically assembly
30 routines, currently used for the motion compensation and the
31 inverse cosine transform stages) we always have a generic C
32 routine to fall back on. This should be portable to all
33 architectures - at least we have heard reports from people
34 running this code on x86, ppc, sparc, arm and
35 sh4. Assembly-optimized implementations are available on x86
36 (MMX) and ppc (altivec) architectures. Ultrasparc (VIS) is
37 probably the next on the list - we'll see.
38
39 * Reuseability - we do not want libmpeg2 to include any
40 project-specific code, but it should still include enough
41 features to be used by very diverse projects. We are only
42 starting to get there - the best way to help here is to give
43 us some feedback !
44
45The project homepage is at http://libmpeg2.sourceforge.net/
46
47
48MPEG2DEC
49
50mpeg2dec is a test program for libmpeg2. It decodes mpeg-1 and mpeg-2
51video streams, and also includes a demultiplexer for mpeg-1 and mpeg-2
52program streams. It is purposely kept simple : it does not include
53features like reading files from a DVD, CSS, fullscreen output,
54navigation, etc... The main purpose of mpeg2dec is to have a simple
55test bed for libmpeg2.
56
57The libmpeg2 source code is always distributed in the mpeg2dec
58package, to make it easier for people to test it.
59
60The basic usage is to just type "mpeg2dec file" where file is a
61demultiplexed mpeg video file.
62
63The "-s" option must be used for multiplexed (audio and video) mpeg
64files using the "program stream" format. These files are usualy found
65on the internet or on unencrypted DVDs.
66
67The "-t" option must be used for multiplexed (audio and video) mpeg
68files using the "transport stream" format. These files are usualy
69found in digital TV applications.
70
71The "-o" option is used to select a given output module - for example
72to redirect the output to a file. This is also used for performance
73testing and conformance testing.
74
75The "-c" option is used to disable all optimizations.
76
77
78OTHER PROJECTS USING LIBMPEG2
79
80libmpeg2 is being used by various other projects, including:
81
82 * xine (http://xine.sourceforge.net/) - started as a simple
83 mpeg-2 audio and video decoder, but it since became a
84 full-featured DVD and video media player.
85
86 * VideoLAN (http://www.videolan.org/) - video streaming over an
87 ethernet network, can also be used as a standalone player.
88
89 * MPlayer (http://www.MPlayerHQ.hu) - another good player, it is
90 also very robust against damaged streams.
91
92 * movietime (http://movietime.sourceforge.net/) - still quite
93 young, but it looks very promising !
94
95 * mpeg2decX (http://homepage1.nifty.com/~toku/software_en.html) -
96 a graphical interface for mpeg2dec for macintosh osX.
97
98 * TCVP (http://tcvp.sf.net) - video and music player for unix.
99
100 * drip (http://drip.sourceforge.net/) - a DVD to DIVX transcoder.
101
102 * PoMP
103 (http://www.dmclab.hanyang.ac.kr/research/project/PoDS/PoDS_sw.htm) -
104 a research player optimized to minimize disk power consumption.
105
106 * OMS (http://www.linuxvideo.org/oms/)
107
108 * XMPS (http://xmps.sourceforge.net/)
109
110 * GStreamer (http://www.gstreamer.net/) - a framework for
111 streaming media; it has an mpeg2 decoding plugin based on
112 libmpeg2.
113
114 * mpeglib (http://mpeglib.sourceforge.net/) - a video decoding
115 library that usess libmpeg2 when decoding mpeg streams.
116
117 * daphne (http://daphne.rulecity.com/) - a laserdisc arcade game
118 simulator.
119
120 * GOPchop (http://outflux.net/unix/software/GOPchop/) - a
121 GOP-accurate editor for MPEG2 streams.
122
123If you use libmpeg2 in another project, let us know !
124
125
126TASKS
127
128There are several places where we could easily use some help:
129
130 * Documentation: libmpeg2 still has no documentation. Every
131 project using it has had to figure things out by looking at
132 the header files, at the mpeg2dec sample application, and by
133 asking questions. Writing down a nice documentation would make
134 the code more easily reuseable.
135
136 * Testing: If you find any stream that does not decode right
137 with libmpeg2, let us know ! The best thing would be to mail
138 to the libmpeg2-devel mailing list. Also, it would be nice to
139 build a stress test so we can make sure libmpeg2 never crashes
140 on bad streams.
141
142 * Coding: There is a small TODO list in the mpeg2dec package,
143 you can have a look there ! Most items are pretty terse
144 though.
145
146 * Porting: If you're porting to a new architecture, you might
147 want to experiment with the compile flags defined in
148 configure.in . When you figure out whats fastest on your
149 platform, send us a patch !
150
151 * Assembly optimizations: We only have x86 and altivec
152 optimizations yet, it would be worthwhile writing routines for
153 other architectures, especially those that have SIMD
154 instruction set extensions ! Also the yuv2rgb x86 routines
155 could probably be optimized a lot.
156
157
158CVS SNAPSHOTS
159
160A daily snapshot is created using "make distcheck" every night and
161uploaded to http://libmpeg2.sourceforge.net/files/mpeg2dec-snapshot.tar.gz .
162It is easier to use than the CVS repository, because you do not need
163to have the right versions of automake, autoconf and libtool
164installed. It might be convenient when working on a libmpeg2 port for
165example.
166
167
168CVS REPOSITORY
169
170The latest libmpeg2 and mpeg2dec source code can always be found by
171anonymous CVS:
172
173# export CVSROOT=:pserver:anonymous@cvs.libmpeg2.sourceforge.net:/cvsroot/libmpeg2
174# cvs login (Just press Return when prompted for a password)
175# cvs checkout mpeg2dec
176
177You can also browse the latest changes online at
178http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/libmpeg2/mpeg2dec/
179
180The other CVS modules are mpeg2dec-streams for the test suite, and
181mpeg2dec-livid for the CVS history of the project while it was still
182hosted on the linuxvideo.org servers.
183
184
185MAILING LISTS
186
187See the subscription information at http://libmpeg2.sourceforge.net/lists.html
188
189libmpeg2-devel
190
191This is the main mailing list for technical discussion about
192libmpeg2. Anyone wanting to work on libmpeg2, or maybe just stay
193informed about the development process, should probably subscribe to
194this list.
195
196libmpeg2-checkins
197
198All libmpeg2 checkins are announced there. This is a good way to keep
199track of what goes into CVS.
200
201libmpeg2-announce
202
203This is a very low traffic mailing list, only for announcements of new
204versions of libmpeg2. Only project administrators can post there.