Change-Id: I7c7f193dea8e99be31d048b3fe2b198887a52822

At this point, av1_adapt_intra_frame_probs() can be removed.

Change-Id: I7e9f97e8e782b88c10e108230e5d12309460c477

The FIXME is a leftover from the expired code flow. It is no longer
valid for the current codebase.

Change-Id: Ic498e6d5c59581b559eacc087a98479e8be37555

Part2 of ext-warped-motion experiment was removed.

Change-Id: I1b7aebad1fd7cb60d92c3ce959d5101228addae2

Enable palette mode for
4x4, 4x8, 8x4, 4x16, 16x4, 8x32, 32x8, 16x64, 64x16

0.8% gain on screen_content keyframe coding.

Change-Id: Ic3c089b74171ace9082a0d3ad9e27c8a27553789

Removing the drl dependency on the candidate list length appears
to incur more than 0.3% compression performance loss. Hence remove
this option from opt-ref-mv to allow better latency vs compression
performance trade off.

Change-Id: I6edaeb2d437996082b7bdd6cda7351426c5584b9

0.15% gain on the screen_content testset.

BUG=aomedia:998

Change-Id: Ia6484a90b92a00bb0073ecf988b5c164fe8ba84c

Use the number of pixels in a block as context, rather than the bsize
itself. The rectangular blocks therefore share the same context, e.g.
BLOCK_8X16 and BLOCK_16X8.

The number of contexts is reduced from 10 to 7.
Almost no coding performance changes.

Change-Id: Ib3241194580c2b93ad0e953957cdc9188393d055

This is a bitstream simplification.
It will reduce motion vector context model generating latency.

Change-Id: I98a496f5d72402ff51a478d5387a0653fa306dc1

For ext-skip, if a partition block uses the new skip mode,
NEAREST_NEARESTMV is the prediction mode. Other predictions were once
tried out but did not show noticeable coding gains.

Change-Id: I76c0aa0c68fe71f95cc4a09ef0de533e4ceb2f60

Clean up: clean up unused entropy related arrays
Bug-fixes: resolve compiling errors when it is enabled with
entropy_stats and ext_skip

Change-Id: I2893e1b5c09e847fb4677f6e62709464208b76f8

Change-Id: I17fd041e9e1cead6b2b6339f0efa55c1ee9938af

"+ 1" has been added in a few locations to match the indices for the
context for the CDFs and the motion vectors.

Suggested fix (of removing +1s entirely) can then be implemented
without further affecting the overall behaviour of the encoder and
decoder.

BUG=aomedia:858

Change-Id: I650a618d3fda1d27bd3550d25ad1ac52e4365061

For ext-skip, the use of distance-weighted prediction has only shown
a coding gain in the AMCY low delay scenario. It is hence not being
considered and compound-average is used exlusively.

Change-Id: I57439eda1246e179d6404bbec366c6c610af3a36

Change-Id: I92f73b78dfd0e25a61897e8b6e9e28ff210376d5

av1_mode_context_analyzer is always called with block == -1.

Change-Id: Ibc9e7e87ea95f3651f7505b82674a6fd795ae985

All compound predicted frames now have the choice to either turn on
or off the use of the skip mode. The current encoder design only
turns on the use of skip mode when the temporal distances of the two
reference frames to the current frame are only different by 1.

This patch also includes a fix on the calculating of the temporal
distance between the two reference frames to the current frame for
skip mode.

Performance wise, this patch does not have noticeable impact as the
encoder stays with the same choice with the frame-level skip mode
flag.

Change-Id: I34f370940b3b25d2ab429b8721344133ae6288ad

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

Change-Id: Idec45a597398ff4fddc6a040c3d7cb3a3c0029d6

For both low delay and high delay scenarios, the reference pair in
skip mode are specified as the closest fwd ref, together with the
closest bwd ref if there is any bwd ref, otherwise with the two
closest fwd refs.

Skip mode by default uses COMPOUND_AVERAGE. When all the reference
frames are on the same side, temporal-distance weighted compound is
considered, and a compound index is signaled to indicate whether
distance-weighted compound or compound-average is usd.

Whether to use distance-weighted compound for skip mode is still
under experimenting, hence a flag is temporarily added:
SKIP_MODE_WITH_JNT_COMP.

Following experimental results are obtained over 30 frames, using the
setup of --disable-ext-partition --disable-ext-partition-types
--disable-txmg --enable-jnt-comp --enable-mfmv --enable-ext-skip:

(1) High Latency:
For Google test sets (lowres/midres), the BDRate coding gain is ~0.2%;
For AWCY, the coding gain is ~0.1%.
(2) Low Latency:
No gain has been observed over Google sets and ~0.1% gain is obtained
only when temporal-distance weighted prediction is used.

Change-Id: I8c433357adebed0126ebfdd5c4d51aa71e64be57

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