[Ffmpeg-devel] [REQUEST] MMX/MMX2 and SSE optimizations for H.264 decoding
Thu Sep 15 13:02:22 CEST 2005
> On 9/14/05, Michael Niedermayer <michaelni at gmx.at> wrote:
>> why dont you try to become a programmer then?
> You know, the usual excuses; I'm too old, got too little free time, etc.
I think you've hit the nail on the head here... the main problem isn't
that the FFmpeg developers aren't aware of the areas where optimization
needs to be done or that they don't have the necessary manuals or
information (believe me, the guys who would be candidates for this
_know_ where to get the Intel Reference Manual...).
Besides, the H.264 code already uses MMX... it uses both the general MMX
routines from libavcodec/i386 and H.264-specific routines (take a look
at libavcodec/i386/h264dsp_mmx.c). Now, I don't know if that covers all
of the areas that could benefit from MMX (Michael?), but the point is:
H.264 _is_ a performance-hungry codec, even for decoding, and it may
just be too much for an Xbox...
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