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This commit adds 2x2 transform block scan order to make the
adaptive scan order support cb4x4 mode.

BUG=aomedia:135

Change-Id: Ic8c3ae9ed65d577df629524b617b386b5e799d4c

The check condtion on block size is deprecated. No need to keep
this assertion around.

Change-Id: Icf2dde2a678cbbce837798877634b7be54e86e67

When segment feature is on, frame level cm->tx_mode can be set to
ONLY_4X4 only if all segments are lossless. Otherwise will cause
bugs when xd->lossless[i] is 0 and xd->lossless[0] is 1.
Also fix the condition of coding tx_type, which should be on when
the qindex of current segment is > 0.

BUG=aomedia:106
BUG=aomedia:104

Change-Id: Ic076083bb78b3b99a6f7d17ec82ee402c64bcc52

We need uint16_t buf for storing no-rounding prediction.
Add uint16_t buf in conv_params for that.
This CL let us avoid changing interface of convolve functions.

Change-Id: I079fad911327f40ffb98e17c73e7638b1719c975

Separate prediction code and parameter generating code.
This will not change bitstream statistics.

Change-Id: I194480166d3f8641592e53683029be1d466cfba9

At the final round of encoding of each superblock, will go through
each prediction block to check if ncobmc mode is better than non-
overlapped prediction. Note that causal obmc mode is dumped here.

PSNR gain (MOTION_VAR + NCOBMC): -2.845% lowres

Change-Id: Ibe504f7f1882446a08ba426e1e9824bca73bf655

While encoding a key frame with quantizer = 0 and aq-mode = 1,
for some segment_ids, the quantizer got modified and could be
> 0, and lossless[segment_id] might be 0 or 1 depending on the
segment_id. Namely, blocks with lossless[segment_id] = 0 were
allowed to choose transform sizes other than 4x4. This conflicted
with tx_mode which was a frame-level decision. In this patch,
the transform search condition was modified so that the transform
choice was consistent with tx_mode of that frame.

BUG=aomedia:104

Change-Id: Ia39127b5dee129283a133cf5e4000da62d9e0f1c

These are under EXT_TX + RECT_TX experiment combo.

Results
=======

Derf Set:
--------
All Intra frames: 1.8% avg improvement (and 1.78% BD-rate improvement)
Video: 0.230% avg improvement (and 0.262% BD-rate improvement)

Objective-1-fast set
--------------------
Video: 0.52 PSNR improvement

Change-Id: I1893465929858e38419f327752dc61c19b96b997

Change-Id: I0d9850e082b8da3b182a3bbaf6569c45317c9659

Those functions includes
av1_make_inter_predictor
av1_build_inter_predictor
inter_predictor

Change-Id: Ide3b744277cf30964e8b352fc8de91365d7217a8

At the edges of the picture only a subset of partitions are legal. Add
new contexts for these borders so they don't distort the probabilities of
the interior of the image where all partitions are legal.

Only include one context for each block size of each border direction
because so few blocks fall into these contexts to begin with.

objective-1-fast:
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0294 | -0.0911 | -0.2382 |  -0.0481 | -0.0441 | -0.0450 |    -0.0454

derf144: -0.135
lowres: -0.124
midres: -0.076
hdres: -0.078

Change-Id: I909b98eebb7e49273cde90154c8408febe334158

Adds a few options to make the compound mask lightly dependent on the
the two predictors.

Also adds high bit depth support

Change-Id: If57b6e8ddd140e0c00fd9d4738927d37225091cb

Call av1_convolve_init_# before testing convolve functionality.

Change-Id: I15c7c292251a7dbf2ea77a2778f8dc7049ae8334

Beside above and left positions, additional above-left,
above-right, and bottom-left positions are added as
neighbor candidates.

In av1_update_neighbors, two available positions will be picked as
context neighbors.

The picking priority is
above -> left -> above-left -> above->right -> bottom->left

Change-Id: I82eaf0b23d0189caaea008ecc86776492886a05b

Change-Id: I85f059b6e2c48bcdf2edd3b7bf896fdccbaaa703

- Adjust the accuracy value and fix,
  C/Trans4x4HT.AccuracyCheck/5,6,7 as CONFIG_AOM_HIGHBITDEPTH = 1.

Change-Id: I2f8d97b2e2c1ee45bfae613657ca01b5666d76ee

Change-Id: I77bc383d4b2526cd9bef4d806905db0111c04f65

- Turn on SSE2 unit tests

Change-Id: I285771b04c0dec0501210fde570b9ac3cb9c4be0

Change-Id: If38fa7e7816a556602c937f0526f5842cc216bf3

Rate and distortion stats were not correctly recorded.

Change-Id: I91829d66b42e7b7b5b8bf37a0c1c43d6b8206a9f

When both GLOBAL_MOTION and WARPED_MOTION are enabled, identify
the neighbors using global motion, and generate correct projection
samples, from which the local warped motion is estimated.

Change-Id: I13556a49649208e6f4d30bc570a41074aabc8ae6

Change-Id: Id2537c8826e07ad6605aaa9858ba6d797bcd23a5

In order to use mvs from a future block in obmc, we first send mbmi
info for the entire superblock, and then call another recursion to
handle the coeffs and recon.

Note: this change is currently not compatible with SUPERTX, later I
will move detoken and recon for supertx to a proper place

Change-Id: I19ab77fa137f53a370e68ea777f70d0306e3e303

Simplify code.

Change-Id: Ifa65ea66e55c52ab79f32de1fc27121ddf088fc3

Also fix warning.

Change-Id: Ia515360af9c3269901eb0d002d326b7af43a00e7

Use a round flag in ConvolveParams to indicate if the destination buffer
has the result rounded by FILTER_BITS or not.
This CL is part of the goal of reducing interpolation rounding error in
compound prediction mode.

Change-Id: I49e522a89a67a771f5a6e7fbbc609e97923aecb6

Change-Id: Ia4779ffb47de333d670ae110cbdfb6cc567da910

In order to reduce the code complexity for handling parameter
coding and recon separately for each 64x64 in non-causal obmc
experiment, we break them down to two steps calling separate
functions, one for params, the other dealing with coefficients
and recon(decoder side).
Note: actually the non-causal prediction can use the original
syntax, but right now in the decoder coeff detoken and recon are
heavily nested.

Change-Id: I72d9c42ab8f38b57850d6b0481551893f1702822

End-to-end speed improvements: (measured on tempete_cif.y4m,
20 frames for encoder and all 260 frames for decoder)

* GLOBAL_MOTION encoder: ~10% faster
* GLOBAL_MOTION decoder: 100-200% faster depending on bitrate
* WARPED_MOTION encoder: ~2.5% faster
* WARPED_MOTION decoder: ~20-40% faster depending on bitrate

The improvement in the GLOBAL_MOTION decoder is particularly
large because its runtime is dominated by calls to warp_plane().

This introduces minor changes to the output of the warp filter,
but these should be rare.

Change-Id: I5813ab9e90311e27587045153c32d400b6b9eb92

- Witness the follow user-level speedup on AV1 baseline:
 Encoding time reduction: 4.26%
 Decoding time reduction: 25.35%

Change-Id: Ideaf3cd473ad45ed9256c80d5a5daed0a6e098cf

NCOBMC (non-causal obmc) allows overlapped prediction that takes
mvs from blocks at positions with non-causal relation (e.g. at the
bottom, or to the right) to the current block.
This experiment will be a sub-experiment of MOTION_VAR, so will only
be effective when MOTION_VAR is on.

Change-Id: Ie3aa9591e1c15f5cc251664ea3c146210a5010cf

Replace hard coded numbers with macro defs.

Change-Id: I125ef4e4c8c3aead182c583522450626b730bbb3

Fix the corner case and use the right rate cost udpate for rd_debug.
This would make the var-tx pass rd_debug test.

Change-Id: Ib0fbd2d73030c0d150222c6b7c2dfffc0c6af085

Make the transform block partition context model support the
rectangular transform block size partition. The coding gains
from cb4x4 and var-tx are:
          cb4x4 + var-tx
lowres         4.3%
midres         2.6%

Change-Id: I6cc1413fbf6d7707ca7fd24300623a3f0118be7c

Replace all instances of Daala's OD_ACCOUNTING with those specified by
 CONFIG_ACCOUNTING.

Change-Id: Ibb59fc5df0ce4b0528b15296bf2f14029c414bc0

The generic coder now uses the AOM entropy coder API and no longer
 needs to include the entenc.h and entdec.h headers.

Change-Id: I213acb5b6bd8a3fe60dc096b83d76ae72315e9de

The functions aom_encode_pvq_split() and aom_decode_pvq_split() code
 the rest value as raw bits using the od_ec_enc_bits() and
 od_ec_dec_bits() functions.
These code bits in the reverse order as the aom_write_literal() and
 aom_read_literal() functions, so both the encoder and decoder must
 be changed at the same time.
This commit has no impact on metrics but is a bitstream change.

Change-Id: Iee79777f35aebbb23043a7efa7fe439af70348ba

The functions aom_laplace_encode_special() and
 aom_laplace_decode_special() code the rest value as raw bits using the
 od_ec_enc_bits() and od_ec_dec_bits() functions.
These code bits in the reverse order as the aom_write_literal() and
 aom_read_literal() functions, so both the encoder and decoder must
 be changed at the same time.
This commit has no impact on metrics but is a bitstream change.

Change-Id: I428d5a83dd108c3a54f3c1dbae2c7fd5e59f5726

A slight improvement for lowres and midres.

Change-Id: I377ba41034e1d70320e0c694d90a058e7809b129

Cherry-pick Daala da7896a7

Remove double negation and added a comment explaining that this is used
for visualization. This change does not alter the bitstream.

Change-Id: I2a01ed292cc5cfa4e1bfdbc08251da6bd2c27158