the new code
* added PAVGP macros for parallel processing to safe few more cycles on
  celerons

Originally committed as revision 625 to svn://svn.ffmpeg.org/ffmpeg/trunk

  and being compiled in the same way as _avg.h
* PAVG_MMX macros accept also output parameter
* implemented faster put_pixels_xy2, but it has slightly smaller precission.
  But there is not visible difference in the image quality - might be eventualy
  easily switched back (#if 0 #endif)- please check

Originally committed as revision 624 to svn://svn.ffmpeg.org/ffmpeg/trunk

  for now it's rather sneak preview (new functions are nearly 100% faster)

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  at different frame rates).
* Do the av_abort() change that is not otherwise worth checking in.

Originally committed as revision 620 to svn://svn.ffmpeg.org/ffmpeg/trunk

* minor speedup for put_pixels_x2 & cleanup

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  as its functionality is used even in those parts which are being
  compiled without this flag
  - generaly this would require more complicated cleanup patch
  - for now leaving for the main author

Originally committed as revision 614 to svn://svn.ffmpeg.org/ffmpeg/trunk

* fixed busy loop test bug on mmx-only machine

Originally committed as revision 613 to svn://svn.ffmpeg.org/ffmpeg/trunk

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  (though I'm not sure which one is correct - but they should match)

Originally committed as revision 610 to svn://svn.ffmpeg.org/ffmpeg/trunk

  (how about making all headers in ffmpeg working this way ?)

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  requests. The current state is that at startup, WMP will get the
  best stream that it can handle. However, subsequent rate switching
  only puts a message in the log saying what the new stream ought to
  be. Solving this will be tricky. I guess that we would have to wait for
  key frames to appear in the new stream, and then switch over to it.
  Some care would be needed to deal with the PTS of the new stream
  versus the old stream.

Originally committed as revision 602 to svn://svn.ffmpeg.org/ffmpeg/trunk

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