MJPEG Tools Svn

Set-up yuvplay to use the 'new, enhanced' features of YUV4MPEG2 streams.

It still can only display 4:2:0 streams. Anything else will require
more real hacking. (Why doesn't Xv/SDL support any other kind of overlay
mode? I'm sure the graphics card's hardware scalers can handle all kinds
of factors. Perhaps no one in the Xv camp has realized the need?)

o Fix two little bugs involving "spatial sampling mode".
o Break out data-only versions of read/write frame/fields functions
(which are useful when how one accesses a frame is predicated on
what the format of the frame is --- i.e. mixed-mode streams).

update the comment at the top which lists the functions in the file. replace
the intsamesign (removed earlier) with rnddiv2 (recently added but not used
anywhere yet).

Merge Scott's inline SSE/MMX DCT and transform routines

Merged updates since last release ready for copying back into HEAD

Seems that an athlon64 can return 31.

Operton and AMD64 update from Gert Vervoort

AMD64 fixes from gert dot vervoort at hccnet dot nl

This commit was manufactured by cvs2svn to create tag
'PRE_BACKMERGE_MPEG_DEVEL'.

This commit was manufactured by cvs2svn to create tag
'LAST_MPEG_DEVEL_MERGE'.