Originally committed as revision 8409 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 8408 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 8403 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 8402 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 8388 to svn://svn.ffmpeg.org/ffmpeg/trunk

and get rid of the data swapping.

Patch by Ian Braithwaite <dk dot braithwaite at ian>

Originally committed as revision 8387 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 8386 to svn://svn.ffmpeg.org/ffmpeg/trunk

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Originally committed as revision 8372 to svn://svn.ffmpeg.org/ffmpeg/trunk

so VARIANT0 will be big and a few % faster, VARIANT1/2 are unaffected

Originally committed as revision 8371 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 8370 to svn://svn.ffmpeg.org/ffmpeg/trunk