Change-Id: I2d32d46002cb92c63050c2b8328865c406103621

Using ALLOWED_REFS_PER_FRAME constants instead of hard coded 3, replacing
memcpy with plain struct assignment.

Change-Id: Ibc86f5d175fcb3f3a3eddacf593525370f1f854c

Function set_mb_row() and set_mb_col() do similar work and are always
called together, this commit merged them into a single function for
clarity and easy maintainence.  This was a TODO item.

Change-Id: I956bd9ed6afb8b2b0469b20fd8bc893b26f8a0f3

Move rectangular superblock coding out of experimental list.

Change-Id: I96c37547d122330d666a67b4bf577ae54547857f

This commit enables selecting probability models for recursive block
partition information syntax, depending on its above/left partition
information, as well as the current block size. These conditional
probability models are reasonably stationary and consistent across
frames, hence the backward adaptive approach is used to maintain and
update the contextual models.

It achieves coding performance gains (on top of enabling rectangular
block sizes):
derf:   0.242%
yt:     0.391%
hd:     0.376%
stdhd:  0.645%

Change-Id: Ie513d9673337f0d27abd65fb566b711d0844ec2e

Change-Id: Icb671cd011f645a3361684207840d14330ca7488

Adding xd->up_available as additional check for above context.

Change-Id: If5654e4cae184b9c369b7b2e08076cb2951d00ed

Change-Id: I6ea9e110b5c5b07ab7d092886dbd51a6eccc0217

Also some further simplification following removal
of top node code.

There is an issue in regards to the shared file vp8cx.h
in regard to the roi_map as this interface assumes that
there are only 4 segments. I have left the value here as
4 for now meaning that the roi_map interface is broken
for VP9.

Note that this change would have been easier if I hadn't
had to search for hard wire instances of the number 4
and <= 3.

Change-Id: Ia8b6deea4be4dbd20deb1656e689dd43a5f190e8

Remove top node optimization.
The improvement this gives is not sufficient to justify
the extra complexity.

Change-Id: I2bb4a12a50ffd52cacfa4a3e8acbb2e522066905

Change-Id: Iaef16122732c2a81e0927f9862b51b68dc788712

This data is fixed at the MB level, so move it to the common part
of MACROBLOCK.

Change-Id: Idd8c87118e501cdf0a202bd84c28b502a8234edf

Quantizers can vary per plane, but not per block. Move these values to
the per-plane part of MACROBLOCK.

Change-Id: I320a55e38b7b28b29aec751a4aca5ccd0c9b9326

Lookup the data per-plane from the MACROBLOCK struct.

Change-Id: I9253c4d3cf886aa9ab4aeab23a2156bfcf994ede

Change-Id: If8ba37bf0b86e8dea88c27d911e8ddb0f6d5a3c5

This commit moves the coeff storage from the MACROBLOCK struct to its
per-plane part. The next commit will remove the coeff member from the
BLOCK structure so that it is consistently accessed per-plane.

Also refactors vp9_sb_block_error_c and vp9_sb_uv_block_error_c to be
variable subsampling aware.

Change-Id: I18c30f87f27c3a012119b6c1970d5fa499804455

Change-Id: Id06b7a299a26ed944a401faae51907537f722a7e

Change-Id: Ia7266b8d3aa3d5cff2db0c3b2f014def045759af

Change-Id: I62dde981f5201c5fbc22001609ee4b5fd0a9bdf5