Patch by James Zern, jzern at google

Originally committed as revision 24430 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24429 to svn://svn.ffmpeg.org/ffmpeg/trunk

Not necessary with the previous patch.

Originally committed as revision 24427 to svn://svn.ffmpeg.org/ffmpeg/trunk

Uses a slightly nonintuitive ring buffer size of (width+height*2) to simplify
addressing logic.
Also split out the segmentation map to a separate structure, necessary to
implement the ring buffer.

Originally committed as revision 24426 to svn://svn.ffmpeg.org/ffmpeg/trunk

Gives better cache locality, since the VP8Macroblock structs are still in cache.
Inspired by the way x264 does it.

Originally committed as revision 24417 to svn://svn.ffmpeg.org/ffmpeg/trunk

As in the previous commit, they aren't used for context selection, so it saves
memory this way.

Originally committed as revision 24416 to svn://svn.ffmpeg.org/ffmpeg/trunk

In VP8, i4x4 only uses contexts based on neighbors in I-frames.

Originally committed as revision 24415 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24414 to svn://svn.ffmpeg.org/ffmpeg/trunk

Avoid edge emulation -- it isn't needed if there isn't any subpel.

Originally committed as revision 24413 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24412 to svn://svn.ffmpeg.org/ffmpeg/trunk

Saves nothing except a bit of memory/cache now, but will allow future
optimizations.

Originally committed as revision 24411 to svn://svn.ffmpeg.org/ffmpeg/trunk

~5% faster overall, probably depends on CPU and resolution.

Originally committed as revision 24410 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24409 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24408 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24406 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24405 to svn://svn.ffmpeg.org/ffmpeg/trunk

SSSE3 versions, improve SSE2 versions a bit.
SSE2/SSSE3 mbedge h functions are currently broken, so explicitly disable them.

Originally committed as revision 24403 to svn://svn.ffmpeg.org/ffmpeg/trunk

Avoid pextrw, since it's slow on many older CPUs.
Now it doesn't require mmxext either.

Originally committed as revision 24397 to svn://svn.ffmpeg.org/ffmpeg/trunk

The ff_inverse table is used by FASTDIV macro, defined in libavutil, but up
to now the table was defined only in libavcodec.

After this change, the main copy of ff_inverse is part of libavutil (just
like FASTDIV), but if CONFIG_SMALL is unset, then a different copy is made
available to libavcodec, to avoid the performance penalty of using an
external look up table.

Dynamic linking works, because the libraries are linked with -Bsymbolic, so
the local copy of the symbol has priority over the external; static linking
works because the table is on a standalone object file in both libraries,
so the linker is able to discard one of the two.

Tested on Linux/x86-64 and Mac OS X/x86-64.

Originally committed as revision 24383 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24381 to svn://svn.ffmpeg.org/ffmpeg/trunk

Should fix compilation with icc and should help prevent any future duplicates

Originally committed as revision 24380 to svn://svn.ffmpeg.org/ffmpeg/trunk

and chroma (width=8).

Originally committed as revision 24378 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24377 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24375 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24368 to svn://svn.ffmpeg.org/ffmpeg/trunk

This is the correct solution to the warning "fixed" in the previous
commit.

Originally committed as revision 24367 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vp8.c:892: warning: suggest explicit braces to avoid ambiguous `else'

Originally committed as revision 24366 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24361 to svn://svn.ffmpeg.org/ffmpeg/trunk

wrong with it tomorrow or so, then re-submit.

Originally committed as revision 24341 to svn://svn.ffmpeg.org/ffmpeg/trunk

regular MMX code. Examples of this are the Core1 CPU. Instead, set a new flag,
FF_MM_SSE2/3SLOW, which can be checked for particular SSE2/3 functions that
have been checked specifically on such CPUs and are actually faster than
their MMX counterparts.

In addition, use this flag to enable particular VP8 and LPC SSE2 functions
that are faster than their MMX counterparts.

Based on a patch by Loren Merritt <lorenm AT u washington edu>.

Originally committed as revision 24340 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24339 to svn://svn.ffmpeg.org/ffmpeg/trunk

for x86-32, or 2 MM registers on x86-64.

Originally committed as revision 24338 to svn://svn.ffmpeg.org/ffmpeg/trunk

so that it does both U and V planes at the same time. This will have speed
advantages when using SSE2 (or higher) optimizations, since we can do both
the U and V rows together in a single xmm register.

This also renames filter16 to filter16y and filter8 to filter8uv so that it's
more obvious what each function is used for.

Originally committed as revision 24337 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24336 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24333 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Nathan Caldwell <saintdev@gmail.com>

Originally committed as revision 24332 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Nathan Caldwell <saintdev@gmail.com>

Originally committed as revision 24331 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24326 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24308 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by flybird2k at gmail

Originally committed as revision 24307 to svn://svn.ffmpeg.org/ffmpeg/trunk