Following the cb4x4 design, the logic related to sub8x8 handling
can be simplifed.

Change-Id: I1ed0c0327a4498614408320a583ad37607bde4af

The get_y_mode function, is superfluous, not used consistently, and requires a
useless block_idx parameter than gets pass around a lot inside the
codebase for no apparent reason.

The block parameter is misleading, as it could cause people to think all these
functions actually use this value.

Change-Id: I7ae0a8d1282c009b9114c83771cce10f5c2ee397

Based on the HW Subgroup call of December 4th 2017, we limit luma partition to
32X32.

Regression on Subset 1
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
0.0881 |  1.3504 |  1.2936 |   0.0572 |  0.0182 |  0.0227 |     0.5204

https://two.arewecompressedyet.com/?job=CfL-PartU%402017-12-12T15%3A39%3A36.794Z&job=CfL-Max32x32%402017-12-12T16%3A10%3A09.989Z

Change-Id: I7e3cfd68097c0bc24b1426348b5fd574c4f638a0

To avoid a cascade of encodes when performing CfL RDO,
we compute DC_PRED on the partition unit. To do so, we
change the tx_size of CfL to match the size of the
partition unit (i.e. CfL partitions only contain 1
transform block).

This change requires disabling CfL when a chroma
partition-unit-sized DC_PRED is unavailable
(i.e. 4:1, 1:4 partitions and chroma partitions > 32X32).

Results on Subset1 (compared to disabling 4:1 and 1:4 partU):
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.1243 | -1.9286 | -2.0140 |  -0.1514 | -0.1512 | -0.1947 |    -0.8066

https://two.arewecompressedyet.com/?job=master%402017-12-12T14%3A53%3A01.451Z&job=CfL-PartU%402017-12-12T15%3A39%3A36.794Z

Change-Id: I2a4adde79c10089130775b8e0df5f9c198855cad

Also, remove warning prevention guard.

Change-Id: I7154f103669e0140068fa6bd7184a8ec34fc7ddf

Change-Id: I8f0f7b7ad996e331c1f1e499e0c6177de9024845

Also, make some locals 'const'.

Change-Id: I030c493b8bb7a1827df16a9feda38dd9dd1e424c

Make sure the ref dv is a valid dv.

Improves compression by about 0.3% on screen_content keyframes.

Change-Id: I3a20c1a04b0ebcad610276f21b410dcfc8ba4c4d

Change-Id: I030205931c78dc572c68661004bafbadd32e4d71

This patch updates also the default cdfs for skip mode. It also remove
the unneeded checking on whether the best obtained RD mode aligned
with the skip mode.

For 30 frames, on both AWCY and Google lowres/midres test sets, with
the following config, the coding gain ranges from ~-0.15% to -0.23%:

--disable-ext-partition --disable-ext-partition-types --disable-txmg
--enable-jnt-comp --enable-mfmv

Change-Id: I39aeeb9e7b27ca679c1b3f9c0eea67b5e1f694e2

Also, splits the sub_tx_size_map array into inter and intra
in order to enable the new 4:1 transforms for inter and
intra separately.
Includes refactoring such as removing the intra_tx_size_cat_lookup
array since it is unnecessary, and consolidating the
max_txsize_rect_lookup array for convenience.

Change-Id: I112553bab612dafb973611c87f36a43e1ac4be85

Adds spatial prediction to standard segmentation instead of a separate
segmentation feature.
When using temporal prediction skipped blocks are flagged as mispredicted.

Change-Id: I0c32281286d3fbce66d339c9247bcc6516f37a63

Also, reduce scope of one local.

Change-Id: I41cb53528d4b7bc88eb343d8c943ed241230af82

Currently 4:1 transforms have max 2 split levels:
4:1 -> 1:1 -> 0.5:0.5.

This refactor enables split levels:
4:1 -> 2:1 -> 1:1,

by simply changing the tables in common_data.h.

The actual switch will be made in a subsequent patch.

Change-Id: I33f8d9ca5159ba3e7d02ced449ddf6f804a8f12a

This experiment allows two choices for the frame-level reference
mode flag: SINGLE_REFERENCE and REFERENCE_MODE_SELECT. It removes
the choice of COMPOUND_REFERENCE, as it has been barely used.

Change-Id: I8af18acd2fe3c0d4928f2b05f35aad0ebcb1556a

This patch simplies the checking criteria for the two groups of
compound modes. It also makes the encoder side cdf update inside the
RD loop consistent with that in the bitstream.

Experimental results on Google test sets (30 frames of lowres and
midres) confirm this patch obtains identical coding performance.

Change-Id: I170eea91f7d2be2170df544cfc2c692b09aa82d6

Change-Id: I17a82393f1b7230119f499e2f9ed8d0b8fe5ba25

Moving CfL to using partition unit DC_PRED requires 4:1 and 1:4 DC_PRED,
which are not currently implemented. A simple solution is to disable CfL
for 4:1 and 1:4 partitions.

CfL is also disabled for luma intra partitions < 4x4. This is inherent
to luma intra prediction partition sizes. We add an assert to enforce
this.

Resulting in the following regression for Subset1
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
-0.0093 |  0.1803 |  0.1519 |  -0.0180 | 0.0256 |  0.0226 |     0.0352

https://two.arewecompressedyet.com/?job=CfL%402017-11-30T19%3A05%3A05.639Z&job=CfL-Disable-4to1%402017-11-30T19%3A04%3A00.761Z

Change-Id: Ie2c8b4d9cb6b6f33a103b540209e1a2fb6df74a7

Extend context model for comp_group_idx.
Save sending comp_group_idx when masked_compound is not allowed.

Change-Id: Ia7ae53958c9e1c8fe07be4b14a425d9b8648082d

Remove COMPOUND_AVERAGE from compound_type_cdfs since it is now grouped
to compound_idx. However, COMPOUND_AVERAGE is still used elsewhere.

Change-Id: Ie0d460aabf9252e80eb4130cfef9aaf0efc3969d

Divide compound inter prediction modes into two groups:
Group A: jnt_comp, compound_average
Group B: interintra, compound_segment, wedge

Change-Id: I1142da2e3dfadf382d6b8183a87bde95119cf1b7

Re-design the dynamic motion vector index coding system to remove
the context parsing dependency on the reconstructed motion vectors.

Change-Id: I01dd6eda239a0bed32d8dc98f0f10f18249a76d4

Change-Id: I3923c7e8a41c33dfdb6c3b6f584abe8ab636ed5a

This patch fixes and enables rectangular intra transform
sizes for 4:1 partitions (that were turned off before).
4:1 partitions can now use rectangular intra predictions with
2:1 rectangular transform sizes.
BDRATE lowres (single keyframe): -0.612%

Change-Id: I6f062f7c08aae8eeb0a55d31e792c8f7e3f302a2

This will make txk_sel support maximum bsize to 128x128

Change-Id: I33941966cb1ae4406ac68a2124c859c833a084d8

Modified the warped motion mode context based on neighbor's motion modes
and current block's mode.

Change-Id: I77ca35fab37ec640bb38661ff1799f643d5aafdc

Change-Id: I244a7285e7a21fbb4dbe8ad9f6ff7c966a0bd601

Previously CDEF was implicitly disabled for a filter block if all its
sub-blocks were skip, and no bits for that block was signalled.  That
required the CDEF signal to be transmitted at the end of the block,
and it was not possible to begin the filtering of the block before
that.

This patch moves the signalling to just after the first zero skip bit
within a 64x64, 128x64, 64x128 or 128x128 block.  If sub-blocks are
skip, then no CDEF bits will be signalled, as before.  Also, the skip
condition flag has been removed so it's always known at the skip flag
whether a coding block is to be filtered or not.

Change-Id: I3adfa3d2d01e288b7db876198aa9985ee9f53917

cfl.h is no longer included in the onyxc_int.h. cfl.h is now included in
each file that uses cfl functions.

Change-Id: I80a2e57159217b0ee20b2562fc9711d929472b8c

The CfL context is now stored inside MACROBLOCKD instead of
MACROBLOCKD only storing a pointer to the CfL context.
The intent is to avoid race conditions as MACROBLOCKD is stored
inside ThreadData. This change also simplifies CfL Initialization.

Change-Id: I991503716b21fc9aca60caddb2008b8bff397e6d

Current encoding of single ref assigns bit 0 to LAST_FRAME and bit 1
to LAST2_frame, whereas the encoding of compound ref assigns bit 1 to
LAST_FRAME and bit 0 to LAST_FRAME. This patch unifies the design and
makes the binary symbol assignment for LAST/LAST2 consistent
regardless of the single/compound ref scenarios.

This patch incurs a small syntax change but should not have noticeable
coding performance impact. Once BUG 973 is fully addressed, default
cdfs for reference frame coding will be updated.

BUG=aomedia:973

Change-Id: I1f3027965c0bb2d343bc8ad873f7c0015123f151

BUG=b/69488541

Change-Id: I2113bba4589f61a09d0dd07c64a522f4d0ae304b
(cherry picked from commit cccda0db727c2282375b174104294b40911d1447)

The fixes in rdopt.c improves the coding performance of
4:1 transforms significantly.

Change-Id: I0e8db93e3f6d9bf0b2de01f2ce83c305d78d2262

A new block mode, referred to as skip_mode is added. If a block is
coded as skip_mode, it will be inter-coded, with its references and
motion vectors derived from its neighboring blocks with zero-residue.
Otherwise, the block can be coded in the current intra or inter mode.

The computational load on skip_mode evaluation at the encoder should
be kept minimum. No transform size / type evaluations are needed.

Change-Id: I5aef0159c7d5ecd64258510835903375d6c536d6

Change-Id: Idc72cff4ab9ba1691a7f5c72366a61be9569d370

If a block's motion_mode is WARPED_CAUSAL and its mode is NEARESTMV, search
its immediate above and left neighbors to get the set of neighbor blocks
using WARPED_CAUSAL motion mode, pick the one with largest block size, and
use that neighbor's warped motion parameters directly for the current block.
If none of the neighbors uses WARPED_CAUSAL motion mode, we estimate the
current block's warped motion parameters.

Before this patch, for every block, we estimate its warped motion parameters.
With this patch, we reduce the number of blocks doing parameter estimation.
Here are results by testing on clips with camera motions.
                    WARPED_CAUSAL blocks   blocks reusing parameters
station2_240p(30f):     3857                    1678
netflix_arieal(30f):     692                     223

No noticable changes in coding gain. Borg test result showed a PSNR
change of +0.006% on cam_lowres set, and -0.014% on lowres set.

Change-Id: If12387ad0ca8a1996ea4c3f1bedcb269ebf78c6c

Change-Id: Ifa2cdc2d2230dfa11396ee3e547653180f96b795

In read_intrabc_info() and assign_dv().

BUG=aomedia:1037

Change-Id: Ic430147a9a15024d942bde361be0c4a603f812e4

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

Change-Id: I6ac62c2825eabcba8f854cfa25c84638d9a73872

This experiment has been abandonned for AV1.

Change-Id: I3501181d096873dec35ea58e4b55530fa76e683f