Originally committed as revision 10449 to svn://svn.ffmpeg.org/ffmpeg/trunk
the remaining points shall be bilinearly interpolated from the
-up to 4 surrounding halfpel points, again rounding should be to nearest and
-halfway values rounded up
+up to 4 surrounding halfpel and fullpel points, again rounding should be to
+nearest and halfway values rounded up
compliant snow decoders MUST support 1-1/8 pel luma and 1/2-1/16 pel chroma
interpolation at least