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Since CB4X4 is adopted and without it the codec does not work,
it is better to remove it and simplify the code.

Change-Id: I51019312846928069727967e3b2bbb60f0fba80d

This experiment has been adopted, we can simplify the code
by dropping the associated preprocessor conditionals.

Change-Id: I4705652ac8231ee25f960e8096dc97c2aeed1d20

While finding the reference MV for a block, if one neighbouring block's
motion mode is warped motion mode, instead of directly adding that
block's MV to the candidate MV list, we use that neighbouring block's
warped motion parameters to compute a MV for the center point of the
current block, and then add that MV to the candidate MV list.

Borg test result:
             avg_psnr ovr_psnr ssim
cam_lowres:  -0.507   -0.514  -0.685
lowres:      -0.114   -0.122  -0.180

The change is added under ext_warped_motion config flag.

Change-Id: I3ce6290a1fd512b613eab5d7620c8bcb08f189a6

Change-Id: Ic4e04ef959e10b60dae6de8d6da50e7a281e654c

Frame sign bias value will not be signaled in frame header. Instead,
the sign bias of reference frames are derived from their corresponding
frame offsets at both encoder and decoder.

The tool of 'frame_sign_bias' is dependent of 'frame_marker'. Compared
against baseline, the enabling of both tools obtains a small coding gain
of -0.08 ~ -0.11% in BDRate over Google lowres/midres tests.

Change-Id: I8d85dc427ced0b2152712ccf61be4be6068075b9

Add an experiment "tmp", which includes:
1. Always use larger block size while storing frame MVs and make
it consistent for CB4X4 or non-CB4X4 cases. Namely, use 8x8 for
4x4 mi size and 16x16 for 8x8 mi size.
2. Allocate smaller buffer for frame MVs and save memory usage.
3. Use nearby 8x8 or 16x16 location's previous frame MVs, and make
the logic simple.
4. Reduce the number of copying for frame MVs, that is very costly
in decoder.

Baseline decoder got 5+% speedup. Borg test on lowres set showed a
+0.009% PSNR difference before/after the patch.

Change-Id: I61e14e95fd35bea88f338931b4f43c44f4e4cf1f

This experiment has been adopted, we can simplify the code
by dropping the associated preprocessor conditionals.

Change-Id: Ic077963f72e8cc2ae9872b58c8a0241988384110

Move functions related to frame index in natural order setup into
a root experiment.

Change-Id: Iebc71514b951dbb658cf0e1c3d42bb2b180d830f

Change-Id: Ic3c93a5d2e427ce1ed578389196a265245063821

Change-Id: Ie67266538db41c6aa7d79a5c270c26c021583c48

Enable the use of motion field estimation in the dynamic motion
vector referencing system. With default experiments on, it improves
the compression performance:

lowres 1.2%
midres 1.5%

Change-Id: Ifc5b15a7239b5c3212ea50f326ab99d372034658

Add frame index to the deocded frames. Store such information to
the reference frame buffer pool. This design allows each frame
to know its index in natural order, as well as its reference
frames positions.

Change-Id: I5bb36928dc5750a4fdcc582dca0d244d6482f400

This patch eliminates the is_inside() checking for each neighouring
block in scan_row_mbmi() and scan_col_mbmi(). Instead, in
setup_ref_mv_list(), find maximum above row_offset and left col_offset
for current block, and use them to decide which above rows and left
columns to search on. This patch doesn't change bitstream. No
noticeable speedup is seen.

Change-Id: Ic4ae74412605d86e9e675f86d23de3a69c04e8f3

This experiment has been adopted as it has been cleared by Tapas.

Change-Id: I0682face60f62dd43091efa0a92d09d846396850

Tile groups are now an integral part of the codec.

Change-Id: I620a88ec7a44b057d5cce0bf6cf602822a3339a9

This CL adds an extra alt-ref reference frame, namely ALTREF2_FRAME,
and designs the contexts for ALTREF2_FRAME.

Change-Id: I12fe8629b868aebf6c2b54260fca5abc38f90ae6

Added a sample selection process in warped motion.
1. Gather more samples including multiple rows on the top, multiple
columns on the left, and the upper-right block.
2. Sort samples by the MV difference between the neighbour's MV and
the current block's MV. Trim the samples with considerably large MV
difference.

Borg test result:
             avg_psnr ovr_psnr ssim
cam_lowres:  -0.241   -0.243  -0.376
lowres:      -0.104   -0.110  -0.179

The changes are wrapped in WARPED_MOTION_SORT_SAMPLES macro.

Change-Id: I2730bb31a0a3ad28215ccd16fd6da0ea8b2ed404

(1) Work with var-refs to remove redundant bits in ref frame
    coding;
(2) Add a new uni-directional compound reference pair:
    (LAST_FRAME, LAST3_FRAME);
(3) Redesign the contexts for encoding uni-directional reference frame
    pairs;
(4) Use aom_entropy_optimizer to collect stats for all the default
    probability setups related to the coding of reference frames.

Compared against the baseline (default enabled tools excluding ext-tx
and global-motion for encoder speed concern) with one-sided-compound,
the coding gain of ext-comp-refs + var-refs - one-sided-compound is:

lowres: avg_psnr -0.385%; ovr_psnr -0.378% ssim -0.344%
midres: avg_psnr -0.466%; ovr_psnr -0.447% ssim -0.513%

AWCY - High Latency:
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.2758 | -0.1526 | -0.0965 |  -0.2581 | -0.2492 | -0.2534 |    -0.2118

AWCY - Low Latency:
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-1.0467 | -1.4500 | -0.9732 |  -0.9928 | -1.0407 | -1.0180 |    -1.0049

Compared against the baseline (default enabled tools excluding ext-tx
and global-motion for encoder speed concern) without
one-sided-compound, the coding gain of
ext-comp-refs + var-refs - one-sided-compound is:

lowres: avg_psnr -0.875%; ovr_psnr -0.877% ssim -0.895%
midres: avg_psnr -0.824%; ovr_psnr -0.802% ssim -0.843%

Change-Id: I8de774c9a74c20632ea93ccb0c17779fa94431cb

The tool of ext-comp-refs adds the uni-directional compound reference
prediction. In details, 3 pairs of uni-direcitonal compound references
are added for the comp ref prediction:
(LAST_FRAME, LAST2_FRAME),
(LAST_FRAME, GOLDEN_FRAME), and
(BWDREF_FRAME, ALTREF_FRAME).

This new tool of ext-comp-refs will eventually overwrite
one-side-compound and have the two coding tools to merge to one.

It achieves -0.35 ~ -0.55% coding gains in BDRate, compared against
AV1 baseline with the default experiments on, but without
one-sided-compound. It achieves -0.2% ~ -0.3% coding gains when
one-sided-compound is on. It achieves larger gains on higher
resolution.

Change-Id: Icbdb16e97b96aaebaf2213f5f72d5331e2e358eb

Now the single ref comp mode should work with WEDGE and
COMPOUND_SEGMENT. For motion_var, the OBMC_CAUSAL mode uses the 2nd
predictor if the neighboring block is single ref comp mode predicted.

This patch removes the mode of SR_NEAREST_NEWMV and leaves four
single ref comp modes in total:

SR_NEAREST_NEARMV
SR_NEAR_NEWMV
SR_ZERO_NEWMV
SR_NEW_NEWMV

Change-Id: If6140455771f0f1a3b947766eccf82f23cc6b67a

Also, add some asserts so that such mistakes don't happen later on.

Change-Id: I61c5f1bcb4db5903f961c94086f1103deead3d85

Change-Id: I640cf08ac583ff5092a18e81cd0e33f05609db6b

wikipedia_420.y4m
PSNR: -1.5035 PSNR-HVS: -1.2607 SSIM: -1.1581

Change-Id: I6e6c4bd9671427b99299df39ff0f42af7daf8ce7

Change-Id: I96e386678f6227f3ca735c9be2725cb9795b3296

The hookup with the encoder-decoder pipeline will be in the following
CLs. This is under the experiment of compound-singleref, with ext-
inter enabled.

Change-Id: I6523a1a6525539eb7c6aa6c5e11724a694e8bf6c

Missing features:
* RDOPT (Forced on for certain blocks)
* Any form of border extension
* Non MI sized right and bottom edges
* MV prediction

Present features:
* Force intrabc for some blocks
* Carry intrabc in the bitstream
* Validate DV is causal
* Reconstruct intrabc block assuming border extension is unnecessary

Change-Id: Ib1f6868e89bfacc2a4edfc876485bad1b347263b

Change-Id: I246da885154303d139f5d97c53ebfc55d6dc82ca

Currently, mbmi->ref_mv_idx can be set to a nonzero value
on the encoder side if mbmi->mode is one of NEARMV, NEWMV,
NEAR_NEARMV, or NEW_NEWMV. But it can only be nonzero on the
decoder side if the mode is NEARMV or NEWMV. Hence av1_nmv_ctx
has previously been disabled when ext-inter is enabled, to
prevent a mismatch due to this.

This patch changes the encoder behaviour to match the decoder
behaviour.

Change-Id: Icfe41fb72e76731ae373fe8c6065f5e003f6414f

This commit changes is_inside() function to reduce the code polution
of CONFIG_DEPENDENT_HORZTILES.

Change-Id: Ic065cc337e0246379d87966a49ddeb48b975c5be

Change-Id: I378eb5b2c03a4c30d261128bcf9ef00ea987ed40

Lowres: 0.03% improvement, 1% improvement on waterfall_cif.y4m
Midres: 0.085% overall improvement, 1.253% improvement on station2_480p25.y4m
Change-Id: I3872934d978bb4ca828c6b9acd2fdb951d9da299

Also supports homography models for future experiments.

Change-Id: I4510540f54133e063891ed491c95c087222f7810

Integerizes computation of the least squares for warped motion.
The model is restricted to only Affine. Affine seems easiest
to compute and integerize since it can be split into two 3-dim
least squares problems, as opposed to rotation-zoom which needs
a 4-dim least-squares problem to be solved.
The current implementation requires only one division per block.

BDRATE impact is mminimal. The upgrade to the affine model improves
coding efficiency but integerization also degrades efficiency a
little. Overall there is a net gain of about -0.07% BDRATE on
the lowres set.
BDRATE lowres: -1.113% with ----enable-warped-motion vs. without
(up from -1.044%).

Change-Id: I6b9216ac0737d76f59054293eabee48e17739ec4

Change-Id: I1050b69045407381d4626b65a0bf6f35957a66f4

This follows the naming for the other frame types, and allows libaom
to be compiled against other libraries that also #define NONE.

Change-Id: Ic2e2814587bbc5ea67385a9af775396d29b7dde0

Take out the functions set for sub8x8 block sizes.

Change-Id: I15836df44051f2c8679c317d52eab9ef55fb5b17

Updates to enums and mappings as needed.

Change-Id: Ie3a71031c74a5d4caa5308f0e210ed23c2361e95

Performance gain (REF_MV on by default)
WARPED_MOTION: 1.061%
WARPED_MOTION+MOTION_VAR: 2.917%
MOTION_VAR: 2.337%

Change-Id: I43f742a02cdd43d13ef333a0a15087062ad020ab

This also fix a few compiler warnings of comparison between signed
and unsigned values.

Change-Id: I1d633f4dfdffff73743dc3f373564056c6d58813

simp_mv_pred is now merged into ref-mv, this commit removes the code
that is leftover. Removing them fixes compiler warnings.

Change-Id: Iad0c521d10924d0eeeaad0b5022beddf9d2bacce