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libmpeg2-0: MPEG-2 Video Stream Decoder
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- Zusammenfassung (meist engl.)
- libmpeg2 is a free library for decoding mpeg-2 and mpeg-1 video streams. It is
released under the terms of the GPL license.
The main goals in libmpeg2 development are:
* Conformance - libmpeg2 is able to decode all mpeg streams that conform to
certain restrictions: "constrained parameters" for mpeg-1, and "main profile"
for mpeg-2. In practice, this is what most people are using. For streams that
follow these restrictions, we believe libmpeg2 is 100% conformant to the mpeg
standards - and we have a pretty extensive test suite to check this.
* Speed - there has been huge efforts there, and we believe libmpeg2 is the
fastest library around for what it does. Please tell us if you find a faster
one ! With typical video streams as found on DVD's, and doing only decoding
with no display, you should be able to get about 110 fps on a PIII/666, or 150
fps on an Athlon/950. This is less than 20 cycles per output pixel. In a real
player program, the display routines will probably take as much time as the
actual decoding !
* Portability - most of the code is written in C, and when we use
platform-specific optimizations (typically assembly routines, currently used
for the motion compensation and the inverse cosine transform stages) we
always have a generic C routine to fall back on. This should be portable to
all architectures - at least we have heard reports from people running this
code on x86, ppc, sparc, arm and sh4. Assembly-optimized implementations are
available on x86 (MMX) and ppc (altivec) architectures. Ultrasparc (VIS) is
probably the next on the list - we'll see.
* Reuseability - we do not want libmpeg2 to include any project-specific code,
but it should still include enough features to be used by very diverse
projects. We are only starting to get there - the best way to help here is to
give us some feedback !
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