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(c) 2003 Diego Casorran
MPEG-2 Decoder
Based on mpeg2decode
Copyright (c) 1996
MPEG Software Simulation Group
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MPEG-2 Video is a generic method for compressed representation of video sequences using a common coding syntax defined in the document ISO/IEC 13818 Part 2 by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), in collaboration with the International Telecommunications Union (ITU) as Recommendation H.262. The MPEG-2 concept is similar to MPEG-1, but includes extensions to cover a wider range of applications.
The primary application targeted during the MPEG-2 definition process was the all-digital transmission of interlaced broadcast TV quality video at coded bitrates between 4 and 9 Mbit/sec. However, the MPEG-2 syntax has been found to be efficient for other applications such as those at higher bit rates and sample rates (e.g. HDTV).
The most significant enhancement over MPEG-1 is the addition of syntax for efficient coding of interlaced video (e.g. 16x8 block sizes for motion compensation, field dct organization, Dual Prime prediction, et al). Several other more subtle enhancements (e.g. 10-bit DCT DC precision, non-linear macroblock scale quantizer, intra VLC tables, improved IDCT mismatch control) were adopted which have a moderate improvement in coding efficiency.... even for progressive video sequences.
Other key features of MPEG-2 are the scalable extensions which permit the division of a continuous video signal into two or more coded bitstreams representing the video at different resolutions (spatial scalability), picture quality (SNR scalability and data partioning), or frame rates (temporal scalability).
The MPEG Software Simulation Group is currently developing MPEG software with the purpose of providing aid in understanding the various algorithms which comprise an encoder and decoder, and giving a sample implementation based on advanced encoding models. The MPEG-2 software project is an on-going development. Since the current version of the encoder already employs a reasonable (and the most popular) subset of the MPEG-2 signal coding toolkit (MPEG-1 and MPEG-2 Main Profile), and there appears to be sufficient public interest, we have decided to make a public release of the code.
The encoder can also be used for generating good quality constant bitrate MPEG-1 sequences and is (to our knowledge) the first publicly available encoder based on the relatively sophisticated TM5 coding model.
mpg2ppm have been compiled and tested on the following platforms:
- SUN SPARCstation 10, SunOS 4.1.3, (gcc compiler)
- '386-PC, MSDOS 5.0, djgpp v1.11, gcc v2.5.7 and MS Visual C++ 4.0
- AmigaOS (using GeekGadgets/gcc 2.95.3)
The source code should compile without major modifications on other 32 bit systems with ANSI C compliant compilers. Systems with 16 bit 'int' variables or segmented memory models are not supported.
Please report any modifications you had to apply in order to install the programs on your system to the address diegocr@users.sourceforge.net
Step 1: edit Makefile
You may have to set CC to your C compiler and CFLAGS to the flags required by the compiler. It is sufficient to set these variables in the top directory Makefile. They are propagated to the individual Makefiles of the encoder and decoder. Any other changes have to be applied to the individual Makefiles, however.
Step 2: edit src/config.h
In most cases, no modification should be required. If your C library doesn't accept "rb" / "wb" parameters in fopen() (required to disable LF <-> CR/LF conversion on MSDOS systems), change the #defines RB and WB to "r" and "w".
Step 3: make
Type 'make' from the top directory. On a PC with DJGPP installed you have to enter 'make pc' in the individual source directories to produce .exe files.
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The changes made to the original mpeg2decode source core are the follows:
- It extract to PPM format only
- Added methods to dump between frames/GOPs
- Rewrited the proccess_options procedure
- Removed the code to decode P & B frames (this speed up the program!)..
- Added functions imp() and getime()
- ...may others but I dont remember now ;)
I want to thank a lot to Christian Effenberger, for all your notes about how mpg2ppm must work, without him I was not able to do this...