Change-Id: Icf8ad313c543462e523bff89690e5daa8d49bcc0

Experiments with a larger set of contexts and some
clean up to replace magic numbers regarding the
number of contexts.

The starting values and rate of backwards adaption
are still suspect and based on a small set of tests.
Added forwards adjustment of probabilities.

The net result of adding the new context and forward
update is small compared to the old context from the
legacy find_near function.  (down a little on derf but
up by a similar amount for HD)

HOWEVER.... with the new context and forward update
the impact of disabling the reverse update (which may be
necessary in some use cases to facilitate parallel decoding)
is hugely reduced.

For the old context without forward update, the impact of
turning off reverse update (Experiment was with SB off) was
Derf - 0.9, Yt -1.89, ythd -2.75 and sthd -8.35. The impact was
mainly at low data rates.

With the new context and forward update enabled the impact
for all the test sets was no more than 0.5-1% (again most at
the low end).

Change-Id: Ic751b414c8ce7f7f3ebc6f19a741d774d2b4b556

added additional motion vectors at close neighborhood of a superblock
to the list of candiate motion vectors, and removed a couple that are
further away.

The change helped std-hd set about .8% (all metrics) and smaller gain
for derf set.

Change-Id: Iaa69b98614db43420ed3fd4738d0ca5587b90045

A patch on compound inter-intra prediction.

In compound inter-intra prediction, a new predictor for
16x16 inter coded MBs are obtained by combining a single
inter predictor with a 16x16 intra predictor, in a manner
that the weight varies with distance from the top/left
boundary. The current search strategy is to combine the best
inter mode with the best intra mode obtained independently.

Results so far:

derf +0.31%
yt +0.32%
std-hd +0.35%
hd +0.42%

It is conceivable that the results would improve somewhat
with a more thorough search strategy where all intra modes
are searched given the best mv, or even a joint search for
the best mv and the best intra mode.

Change-Id: I7951f1ed0d6eb31ca32ac24d120f1585bcd8d79b

Tags VP9 tracks with the V_VP9 video type when writing to .webm files,
and supports decoding both from vpxdec without specifying --codec.

Change-Id: I0ef61dee06f4db2a74032b142a4b4976c51faf6e

duplicate code clean-up and variable name corrections

Change-Id: Ibc4703228e652ec425125de5e7bc038fa46595c5

this commit changed the asm file compiling in MSVC to use individually
customized build command line with object filename specified for each
input file. This allows object filenames prefixed with path name, and
avoid name collision in link time

Change-Id: I996098643dcadc393af57035a04bef3877f45424

Change-Id: Ib8f8a66c9fd31e508cdc9caa662192f38433aa3d

Rather than building an object file directory heirarchy matching the
source tree's layout, rename the object files so that the object
file name contains the path in the source file tree. The intent here
is to allow two files in different parts of the source tree to have
the same name and still not collide when put into an ar archive.

Change-Id: Id627737dc95ffc65b738501215f34a995148c5a2

Update decode_coefs() to break when c >= eob, since it's possible that
c starts the loop from 1 and eob is 0. The loop won't terminate in that
case.

Add new get_eob() function to consistently clamp the eob based on the
segment level EOB and the block size. It's possible to code a segment
level EOB that's greater than the block size, and that leads to an
out of bounds access.

Change-Id: I859563b30414615cf1b30dcc2aef8a1de358c42d

* changes:
  Segment mode coding bug.
  Silenced a few warnings.

Change-Id: Ia24e0fddcca9125f8e41e95dbb22444dc51767c7

Change-Id: I8e12fbab7ec4732b6400ae3a6964749d818c90c9

Change-Id: I478878c78ef8a770186622d987d318176827ef5f

This is in line with other cases where we disable ADST if prediction
size and transform size don't match. Before this patch, the RD loop
will use ADST for superblocks, but frame encoding/decoding won't.

Change-Id: I700368c632eb72b5e089c22ef25649d99d7697d0

There are now more than 16 possible modes so 5
bits required for segment mode feature.

Note that it is likely that the mode feature and how it is
coded will change but for now the 4 bits was a bug.

Change-Id: I63348ae3a9cc31566a656c2dc78f09f5e1a9dcc9

Silenced a few VS compiler warnings.

Change-Id: I658ea409c36c05cd11042675e2e42ccde0ef2420

CONFIG_DEBUG was turning on some code to dump the reconstructed frame
to a buffer from within the decoder. Move this code to a more specific
debugging define.

Change-Id: I3ca9ea634bdbd186f2470bd644d3695ee0ab3037

If the SEG_LVL_MODE is an intra mode, then the reference frame must be
INTRA_FRAME.

Change-Id: I2cdeeac3780c077c74b39ce89a528bc280674231

Change-Id: I7b6f27826052eb706fc6080d4e3a940dff7d3a58

This fix ensures that the forward prob update is not turned off for
motion vectors.

Change-Id: I0b63c9401155926763c6294df6cca68b32bac340

Change-Id: I417e39867c020a17d85370972446a8ce2bbe9a6d

Change-Id: Ia1eddb108ec463835e9de8769572d698e21bca49

This change is a fix / extension of the newbestrefmv
experiment. As such it is presented without IFDEF.

The change creates a new context for coding inter modes
in vp9_find_mv_refs(). This replaces the context that
was previously calculated in vp9_find_near_mvs().
The new context is unoptimized and not necessarily
any better at this stage (results pending), but eliminates
the need for a legacy call to vp9_find_near_mvs().
Based on numbers from Scott, this could help decode
speed by several %.

In a later patch I will add support for forward update of
context (assuming this helps) and refine the context as
necessary.

Change-Id: I1cd991b82c8df86cc02237a34185e6d67510698a

Experiment to test speed trade off of reducing the
extent of the ref mv search.

Reducing the maximum number of tested candidates to 9 had
minimal net effect on quality in any of the tests sets.

Reduction to 7 has a small negative impact (worst was STD-HD
at about -0.2%).

This change is in response to the apparently high number of
decode cycles reported in regard to mv-ref selection.

Change-Id: I0e92e92e324337689358495a1ec9ccdeb23dc774