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Keep track of the best and second best full pixel motion vector
candidates, and do subpel search around both of them.

Compression improvement:
lowres 0.22%   midres 0.23%   hdres 0.18%

No noticeable encoding speed changes observed on lowres test clips.

Change-Id: I5f4df2a03d1db061cfdfdba6138b27e9ea91f089

from PICK_MODE_CONTEXT and MACROBLOCK

Change-Id: I42f98ce51871948244bdcaaaeb3d0191622116ae

1. Add "best_mv" in MACROBLOCK to store the best motion vector
during motion search, so that we don't need to pass its pointer
to various motion search functions.

2. Declare some functions as static when possible.

3. Fix some indents.

Change-Id: I0778146c0866cbc55e245988c59222577ea8260e

Change-Id: I22f1299545d4c75d80e72d479be66f66ea142ef1

Commit 0d6980d7 removed some use
of the skip_txfm optimization, and the rest are not productive.

The current use of this optimization is only used with --good
and --cpu-used >= 3, however the overhead of this is higher than the
speedup it yields.

Removing this, and subsequently simplifying model_rd_for_sb yields
a net encoder speedup:
--cpu-used=0    ~1.5% faster
--cpu-used=3    ~2.0% faster

The code simplification is also significant.

Change-Id: I1dd668c32de15a2e912c59c42379d0f9e1032ff8

Add the ability to pick between 3 quantization profiles.
The profile is chosen based on the entropy context at the
block level.

Change-Id: Iaea0485798441b7d635962c2563f3a477f582dac

pred_variance in obmc experiment is equivalant to recon_variance in
baseline

Change-Id: Iba8fb9bd973898be5a0d87a507ceaf65c75bdc51

This is purely refactoring in preparation of fixing supertx segment
handling

Change-Id: I74bcae34241fdf2b592e1cd45b67af77b9e16c9a

This experiment implements non-uniform quantization where
the width of the bins increases gradually to more closely
match a laplacian distribution of the coeficcients.

Performance Gain:
derflr: 0.15%
hevcmr: 0.675%

Change-Id: I25234244e3bcd94b87c1f77cf682190b61c8ef94

The assumption doesn't hold true in the current codebase. Remove
this speed feature to simplify the codebase.

Change-Id: I9b69f484c9b7cd612b825047cc5b2fce63ee0af7

Seperate prediction mode and tx type search for inter
modes. Enabled for speed >=1.

baseline:
speed increase     40%
compression drop   0.30%/0.29% on lowres/midres

ext-tx:
speed increase    160%
compression drop  1.08%/0.95% on lowres/midres

Change-Id: Ieb34b1ee80df6980d16e26a5783e08cc0deae55b

Add a speed feature to seperate prediction mode and tx type search
for intra modes: search for best intra prediction mode with fixed
default tx type first, then choose the best tx type for the
selected mode.

Coding performance drop:
baseline
  lowres 0.10% midres 0.08% hdres 0.14%
with ext-tx
  lowres 0.14% midres 0.25% hdres 0.20%

Speed improvement is 20% for baseline and 17% for ext-tx.

It is turned on for speed >= 1.

Change-Id: Ia5e8d39e8a4e2e42c521bfde938f8b6a98ab24f9

This commit handles the zero motion vector residuals for single
and compound reference modes, respectively. It improves the coding
performance by 0.13% with no additional encoding complexity.

Change-Id: I16075a836025bd2746da2ff4698fb9261e4b08c1

Compute the reconstruction variance in the prediction mode search.

Change-Id: Id9c7635a9c9f5383e61c0e427e95234211834301

About 20% less time spent coding in vp10_k_means().

Change-Id: I5cf7605cde869a269776197bace70de353b07d83

Rename MI_BLOCK_SIZE.* -> MAX_MIB_SIZE.* (MIB is for MI Block).
Rename MI_MASK.* -> MAX_MIB_MASK.*

There are no functional changes.

This is in preparation for coding the superblock size at the frame
level, which will require some of these constants to become variables.
The new names better reflect future semantics, and hence make the code
clearer.

Change-Id: Iee08d97554cf4cc16a5dc166a3ffd1ab91529992

If --enable-ext-partition is used at build time, the superblock size
(sometimes also referred to as coding unit (CU) size) is extended to
128x128 pixels.

Change-Id: Ie09cec6b7e8d765b7555ff5d80974aab60803f3a

This patch fixes 2 issues in Palette mode:
1. More memory is needed in PALETTE_BUFFER for 444 video format.
2. A merge issue caused by
https://chromium-review.googlesource.com/#/c/333940/7

Change-Id: I2aedc7dfdfb6b66fbd600189ec6e1e2cc6120d40

Simple refactoring to 2 dimensional arrays, in preparation for 128
wide superblocks.

Change-Id: I40d447bd9fbd4f755534ea3cc82fc8f4676cea07

This commit fixes an encoding issue related to var-tx and ref-mv
experiments that causes the codec to use random values for transform
block skip flag.

Change-Id: I8daa6d6b88ea45b5bbeb81b43dd0eeff545c8e5a

Instead of using model_rd_for_sb() to estimate the cost and make the
decision on bmc/obmc, we use super_block_yrd/uvrd() to calculate and
compare the real rd costs of bmc and obmc.

Average bit-rate reduction(%) of obmc experiment:
derflr/derfhd/hevcmr/hevchd
2.353/TBD/TBD/TBD
Before the optimization, the coding gain was:
1.582/1.109/1.600/1.164

Note: there is still some mysterious bug because that compared to
the previous version, the performance at low bit rate drops a lot.

Change-Id: I8dbee04a272190f10516a3953c1ae690f8136766

This commit unifies the motion vector cost buffers for full pixel
and sub-pixel motion search. The new motion vector coding system
provides 0.5% coding gains for 720p and above sequences and 0.2%
for lower resolution sets.

Change-Id: I927ec81eadc39d11a3c12b375221a1ddd2e8bf24

This commit accounts for the context based probability model for
motion vector cost estimate in rate-distortion optimization.

Change-Id: Ia068a9395dcb4ecc348f128b17b8d24734660b83

Brings the following commits to vp10:
269428e3 Tie the bit cost scale to a define.
d13385ce Switch to 9-bit rate cost constants built on a 256 probability denominator.
ad43a738 Fix a signed overflow in vp9 motion cost.
1c9b0918 Fix some interger overflow errors
fac947df Restore previous motion search bit-error scale.

Change-Id: I598ba7ee7efcde18439c31dfa96b86cbf297a580

Combinations of different mv modes for two reference frames
are allowed in compound inter modes. 9 options are enabled,
including NEAREST_NEARESTMV, NEAREST_NEARMV, NEAR_NEARESTMV,
NEAREST_NEWMV, NEW_NEARESTMV, NEAR_NEWMV, NEW_NEARMV, ZERO_ZEROMV,
and NEW_NEWMV.
This experiment is mostly deported from the nextgen branch.
It is made compatible with other experiments

Coding gain of EXT_INTER(derflr/hevcmr/hevchd): 0.533%/0.728%/0.639%

Change-Id: Id47e97284e6481b186870afbad33204b7a33dbb0

This commit allows the codec to add motion vector pairs into
the candidate list. It further improves the compression performance
by 0.1% across derf, hevcmr, stdhd, and hevchr sets without adding
encode/decode time.

Change-Id: I88d36da25a2a89bb506d411844af667081eba98b

This commit allows the codec to analyze the reference motion vector
candidate list and adaptively reduce the size of inter prediction
mode set.

Change-Id: Ied6a403843b860d66f26ed485c1825c05c71bdfc

This change has been imported from VP9 and
alters the nature and use of exhaustive motion search.

Firstly any exhaustive search is preceded by a normal step search.
The exhaustive search is only carried out if the distortion resulting
from the step search is above a threshold value.

Secondly the simple +/- 64 exhaustive search is replaced by a
multi stage mesh based search where each stage has a range
and step/interval size. Subsequent stages use the best position from
the previous stage as the center of the search but use a reduced range
and interval size.

For example:
  stage 1: Range +/- 64 interval 4
  stage 2: Range +/- 32 interval 2
  stage 3: Range +/- 15 interval 1

This process, especially when it follows on from a normal step
search, has shown itself to be almost as effective as a full range
exhaustive search with step 1 but greatly lowers the computational
complexity such that it can be used in some cases for speeds 0-2.

This patch also removes a double exhaustive search for sub 8x8 blocks
which also contained  a bug (the two searches used different distortion
metrics).

For best quality in my test animation sequence this patch has almost
no impact on quality but improves encode speed by more than 5X.

Restricted use in good quality speeds 0-2 yields significant quality gains
on the animation test of 0.2 - 0.5 db with only a small impact on encode
speed. On most natural video clips, however, where the step search
is performing well, the quality gain and speed impact are small.

Change-Id: Iac24152ae239f42a246f39ee5f00fe62d193cb98

It was removed by the master branch merge.

Change-Id: I4b2a524c9e052e41063359afcb4ba22bf78344cf

1) Add facade to quantize b/fp/dc version so that their interface
   are the same.
2) Merge vp10_xform_quant b/fp/dc version to one function so that
   the code flow in encodemb.c is clear

Change-Id: Ib62d6215438fc2d07f4e7e72393f964832d6746f

Store it in nextgenv2 for now.

Change-Id: Iab0af0e15246758e3b6e8bde4a74b13c410576fc

This commit ports the motion vector stack from motion field
analyzer to the encoding and decoding pipeline.

Change-Id: Ie283c1e1a15b4c17a1c7c175ce322bf053bb7840

Javan Whistling Duck release.

Change-Id: If44c9ca16a8188b68759325fbacc771365cb4af8

Allow the encoder to drop individual transform block coding.

Change-Id: I2c2b2985254cb92baf891f03daa33f067279373b

Add palette mode for keyframe luma channel. Palette mode is enabled
when using "--tune-content=screen" in encoding config parameters.

on screen_content testset:  +6.89%
on derlr                 :  +0.00%

Design doc (WIP):
https://goo.gl/lD4yJw

Change-Id: Ib368b216bfd3ea21c6c27436934ad87afdaa6f88

Resolved Conflicts in the following files:
        configure
        vp10/common/idct.c
        vp10/encoder/dct.c
        vp10/encoder/encodemb.c
        vp10/encoder/rdopt.c

Change-Id: I4cb3986b0b80de65c722ca29d53a0a57f5a94316

This is preparatory work for allowing per-segment lossless coding.

See issue 1035.

Change-Id: I9487d02717ee3e766aee61a487780056bb35d2d3

This is preparatory work for allowing per-segment lossless coding.

See issue 1035.

Change-Id: Idd72e2a42d90fa7319c10122032d1a7c7a54dc05

This commit removes mbmi_ext_base pointer from MACROBLOCK struct.
Its use case can be fully covered by cpi->mbmi_ext_base pointer.

Change-Id: I155351609336cf5b6145ed13c21b105052727f30

Change-Id: Ic39d4523e78863c816b0fc85f56ea5ae5e0b3310