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This commit enables the cb4x4 mode to support ext-tx experiment. The
coding performance gains are:

       ext-tx   cb4x4    ext-tx + cb4x4
lowres  2.7%     2.6%      4.9%
midres  2.1%     1.2%      3.0%

Change-Id: I6c566b6073527262abcdbb1a0c6bcb8729988f3b

Remove unnecessary #if statements from the implementation.

Change-Id: I09c2f046aec2c43894f8dcfd99216fdf0a50451d

Change-Id: Id24b4ac814b8b9db8ca3dd8d8d0c19174f345c75

This commit makes the cb4x4 mode support supertx operation.

Change-Id: I1a713b2268c1029aebeb43aa6aeb0fa37b16810f

Replace hard coded numbers with table access. Avoid comparing
values from different enums.

Change-Id: I43216db4a9b13ee317e8e517683946f526e5ca0e

Change-Id: I62b662052a4b9b1de07575824410aa9b2ce2c924

Change-Id: I0005c896a243275c052a0163a5da0f9230071743

The main objective is to reduce computational complexity.
The domain transform filter has an effect of edge preserving smoothing
at a lower computational cost than the bilateral filter, and can be
readily paralelized.

A little drop in coding efficiency about 0.06% for lowres, 0.16% for
midres.

Change-Id: Id949406b7e5afe9b64588d130065c63a76e4f3f9

Change-Id: Id80f76ea2598daa93e693c5efe29b782abe33957

intra-interp experiment allows intra prediction to use different
interpolation filters. It was part of the ext-intra in the nextgenv2
branch.

Change-Id: I27ab692494dc79bb92e457dbf9a72988577f1c6d

This filter is meant to replace the bilateral filter,
but is currently added in addition to the bilateral filter
for testing.

Change-Id: Ia529701e69833d47c11b3367d5bf804eb8498079

No change in performance

Change-Id: Ie105a7baf6a2c2258d3ef117e727957e4393f51b

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

Change-Id: I43f742a02cdd43d13ef333a0a15087062ad020ab

Compression will drop slightly
       BDRate
lowres -0.096%
midres -0.069%
hdres  -0.084%

However, this will reduce the combinations of filter types needed to search in
dual_filter experiment

Change-Id: I75d4ddc73b91099e17fd52a1b1174bd3d2ab3e18

Generate simd filter structure in av1_convolve_init()
This will provide flexibility of changing filter coefficients.

Change-Id: If79f84c56483aa08c894d6b12e2b6ce10147f0ce

This is added as part of ALT_INTRA experiment.

This uses interpolation between top row and estimated bottom row; as
well as left column and estimated right column to generate the
predicted block.The interpolation is done using a predefined weight
array.

Based on experiments, the currently chosen weight array was created
to represent a quadratic curve, but can be tuned further if needed.

Improvement from baseline on Derf set:
ALL Keyframes: 1.279%

Improvement from existing ALT_INTRA:
ALL Keyframes: 1.146%

Change-Id: I12637fa1b91bd836f1c59b27d6caee2004acbdd4

Change-Id: I95455ed7e44f3a163c751bd8a89f6119c0055c71

Use the offset to code tx_size, which allows better scalability in
the implementation. This commit fixes the enc/dec mismatch issue
in cb4x4 experiment.

Change-Id: Ia814273b0be43819f92d1c41cfae4964cfb76ced

Generalize intra buffer size to cover 64x64 txfms.
Fix tx_size encodings.

Change-Id: Ibc219d291b850a600c3a1370d88769a7640fb4d2

The recursive transform block partitioning system naturally supports
the use of rectangular transform block size. Hence there is no need
to make a separate coding route for the rectangular transform block
size support there.

Change-Id: I709b61f94cd4a6ea3f33c05abe319488c7d24f5a

Includes:
Various table updates and fixes to support 64x64 transforms.
Entropymode updates to support tx_size expansion to 64x64.
tx_mode changes to support an ALLOW_64sXx64 transform mode.

Change-Id: Ib9098cfe27d0c015fe3be6ae13e7d09576771b9e

This is currently just a refactor and creates no change in performance.
It allows new compound types to be added easily in the future to
facilitate experiments with segmentation masks.

Change-Id: If48fed216d482454fabb45a304b4220ada0dbdee

BDRATE:
lowres: -1.01% (up from -0.7%)
midres: -1.90% (up from -1.5%)
hdres:  -2.11% (up from ~1.7%)

Change-Id: I1fe04ec9ef90ccc4cc990e09cd45eea82c752e0c

The switch to using daala_ec by default broke the compile
when used with ext-tx, as some code which should have been
inside #if !CONFIG_EXT_TX was not inside such a block.

Change-Id: I4cec9755bd4e6134a7d3036c4482f952a815cafc

Regression from commit 0929da52.

Change-Id: Ib9a9c903ba334c17023e898ce6eb4ff73bdf1389

Reverted commit: f8306bfd (with some changes).

Reason: This was triggering an assert in debug build because of zero
probability values. So, using an "UNUSED_PROB" macro to replace these to
retain clarity.

Assertion failure can be reproduced as follows:

$ make clean; extra_cflags='-O0 -g -fno-inline' ../../configure
--enable-debug --enable-experimental --enable-palette && make -j 16

$ ./aomenc -D --codec=av1 ~/videos/screen_content_set/gimp.y4m -o
/tmp/foo.webm --tune-content=screen --limit=50

Pass 1/2 frame   50/51      8976B    1436b/f   86169b/s 2902620 us
(17.23 fps)
Pass 2/2 frame   25/0          0B 2933053 us 8.52 fps [ETA  unknown]
aomenc: ../../av1/encoder/cost.c:46: cost: Assertion `prob != 0' failed.
Aborted (core dumped)

Change-Id: I47a76b8f415060909bc8448fae3002857eb61d8e

This commit allows the partition context model to account for the
maximum transform block size of the coding block.

Change-Id: I22b91e85fff70faa974afd362ce327d3f2eda81d

Change-Id: I252c2f06dfe256d2d33fd1abc42aaadf50273cc8

Ensure that cdfs are synced with pdfs after every
forward update.

Change-Id: I5677f78300156c8622f1728d7a343ff6c3a4ea64

For clarity, use separate variables for 'color_ctx_hash' and
'color_ctx' instead of reusing same variables for both.

BUG=webm:1324

Change-Id: I3a516ea54353e1f0737822c613a68da252e30c6e

Make the codec support 2x2 tranform block unit for chroma components.

Change-Id: Ic454535bd5620abe88a2e99789160cc4664ee518

Introduce the transform block partition depth macro definition.

Change-Id: I218dc77a77c8e967da4d270d4ec0d7691b712a5f

Performance improvement
        BDRate
lowres  0.921%
midres  0.730%
hdres   1.019%

Change-Id: I26208d6c0531937bff44de505b4ea355c7852802

It's clearer on inspection that the zero probabilities are unused.

Cherry-picked from aomedia/master: 8134db16

Change-Id: I56cddcb41ba256b7bb921d6a8538405165566dfb

consts, comments and other small readability improvements.

Change-Id: I40c5a652811a796fdb91dc7ca6b108e8871f72d1

Move computing the inter_mode_cdf tables per coded inter mode symbol to
 computing them only when the probabilities are updated.

Change-Id: I7a7b059ee75723cb6f278ed82a20cf34c27915d8

Move computing the uv_mode_cdf tables per coded intra mode symbol to
 computing them only when the probabilities are updated.

Change-Id: I627b59d30726c913f5d7ba7753cb0446a12655bb

Move computing the y_mode_cdf tables per coded intra mode symbol to
 computing them only when the probabilities are updated.

Change-Id: I8c43d09b8ef5febe2a3ec64bd51d28bd78ea73ed

Move computing the kf_y_mode_cdf tables per coded intra mode symbol to
 computing them only when the probabilities are updated.

Change-Id: I5999447050c2f7d5dbccde80bee05ecd1c5440ab

Ensure that cdfs are synced with pdfs after every
forward update.

Change-Id: I5677f78300156c8622f1728d7a343ff6c3a4ea64