Extend experiment to use both vectors from MBs
coded using compound prediction as candidates.

In final sort only consider best 4 candidates
for now but make sure 0,0 is always one of them.

Other minor changes to new MV reference code.
Pass in Mv list to vp8_find_best_ref_mvs().

Change-Id: Ib96220c33c6b80bd1d5e0fbe8b68121be7997095

Adds a new experiment with redesigned/refactored motion vector entropy
coding. The patch also takes a first step towards separating the
integer and fractional pel components of a MV. However the fractional
pel encoding still depends on the integer pel part and so they are
not fully independent. Further experiments are in progress to see
how much they can be decoupled without affecting performance.
All components including entropy coding/decoding, costing for MV
search, forward updates and backward updates to probability tables,
have been implemented.

Results so far:
derf: +0.19%
std-hd: +0.28%
yt: +0.80%
hd: +1.15%

Patch: Simplifies the fractional pel models:
derf: +0.284%
std-hd: +0.289%
yt: +0.849%
hd: +1.254%

Patch: Some changes in the models, rebased.
derf: +0.330%
std-hd: +0.306%
yt: +0.816%
hd: +1.225%

Change-Id: I646b3c48f3587f4cc909639b78c3798da6402678

Enable ADST/DCT of dimension 16x16 for I16X16 modes. This change provides
benefits mostly for hd sequences.

Set up the framework for selectable transform dimension.

Also allowing quantization parameter threshold to control the use
of hybrid transform (This is currently disabled by setting threshold
always above the quantization parameter. Adaptive thresholding can
be built upon this, which will further improve the coding performance.)

The coding performance gains (with respect to the codec that has all
other configuration settings turned on) are

derf:   0.013
yt:     0.086
hd:     0.198
std-hd: 0.501

Change-Id: Ibb4263a61fc74e0b3c345f54d73e8c73552bf926

Change-Id: I7524883fb29f42303fb46a5bc6772fbcf8781d1d

Change-Id: I323c429b453eec8c3b76c37f7e2a52da9dfe8d77

Change-Id: I3d585bae446c16fcf7a39d72c1bcd6468a7bb1a1

The transform functions in experimental branch absorbed a scaling
factor of 4 to allow quantization steps closer to unit quantizer.
This commit added scaling code in between forward and inverse
transform to properly account for the scaling factor.

Change-Id: I9a573ddc1ffa74973b34800a5da1a56dbabe0949

Alternative strategy for finding a list of candidate motion
vectors to use as reference values in mv coding and as
nearest and near.

Sort by sad in vp8_find_best_ref_mvs() rather than just
pick the best. Allow 0,0 as a best ref option but not a
nearest or near unless there are no alternatives.

Encode/Decode verified on at least some clips.

Some commented out experimental and stats code still in place.

Gain over existing code averages about 1% on derf (alll metrics)
with improvement on all clips. Other test results pending.

The entropy coding of the mode (nearest/near etc) still
depends upon and requires the old "findnear" code so
this needs looking at and may provide room for further gains.

Change-Id: I871d7cba1d1c379c4bad9bcccce1fb19c46b8247

Change-Id: If4eb0fd60cc5bc2f32254e82e8d6cfa4120cb558

Change-Id: I8d1a2c664cbeb939cf23bcd414b23e19da760a14

Change-Id: Ifff660de60fb12d745092eafc17f6a49f6e1fb53

About 20% overall encoder speedup (vs. about 30% for sse4 version).

Change-Id: Ibf608a6a1bc94b14ec47e8046d3206b275b5a8bd

Change-Id: I887cdcf90b87736f2a3805420aa41eed93324bee

Change-Id: I99311811820169d62fda3febac4bafacfc7a538b

Change-Id: I64c470fb5a4f32a862cfb5424fb95baac47fcc24

Allow sharding of the builds with the --shard= and --shards= options.

Change-Id: I9d5552ad2edc0b1210e96f0e94ce7dfd645c45f8

* changes:
  hybridtransform8x8: fix compilation
  comp_intra_pred: fix compilation

This is being reimplemented more generically in terms of affine
transforms.

Change-Id: I9300bfde5f8b93c708c64f59427087720f8ed782

corrected ifdefs to include CONFIG_HYBRIDTRANSFORM8X8 for missing
definitions

Change-Id: I96cd08c98d74b5ba10866f3fa30252073ce92fa5

Change-Id: Iccb56e3b966d1519ba49dfe4e1396479c6b54a6f

Added missing parameters to calls to:
  vp8_build_intra_predictors_internal
  vp8_build_intra_predictors_mbuv_internal

Change-Id: If8eeb8ff23eff4572397b404fe61be5d0c950bbe

Change-Id: I95217ce52675ad00637fc8f60d4d0dd054efd512

This commit adds a pick_sb_mode() function which selects the best 32x32
superblock coding mode. Then it selects the best per-MB modes, compares
the two and encodes that in the bitstream.

The bitstream coding is rather simplistic right now. At the SB level,
we code a bit to indicate whether this block uses SB-coding (32x32
prediction) or MB-coding (anything else), and then we follow with the
actual modes. This could and should be modified in the future, but is
omitted from this commit because it will likely involve reorganizing
much more code rather than just adding SB coding, so it's better to let
that be judged on its own merits.

Gains on derf: about even, YT/HD: +0.75%, STD/HD: +1.5%.

Change-Id: Iae313a7cbd8f75b3c66d04a68b991cb096eaaba6

Change-Id: I01dd96da18fe22450bb372b10ba90eab52e29bdf

Unroll horizontal pass, no more intermediate buffer, faster special transpose.

Change-Id: I05df75be4e5f01420066cdf3c61a2edf35bedb64

Resolved the decoder mismatch issue due to quantization parameter
threshold for hybrid transform coding. The macroblock dequantizer
initialization is moved to be performed before coefficient
detokenization, since the (de)tokenization is now dependent on the
macroblock level quantization parameter.

Change-Id: I443da4992ebb70ae4114750b2f1363c0c628580e

This doesn't affect the result, since there are no MVs coded using this
entropy. It does, however, silence valgrind warnings about uninitialized
variables.

Change-Id: I6e21ba92df6ce5381bf58b8c349ef4373294a0b6

Error was introduced in bf474e17

Change-Id: I55bf114a1938c3a8869d8ff49cbe076eb9e83ea0