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Update the first PARTITION_PLOFFSET (4) contexts with the four classic
partitions. The extended partitions are only codable above 8x8, but
there are PARTITION_PLOFFSET (4) contexts for dropping below 8x8.

Change-Id: Ib3291dded6dc24103222e8f470504c20e29adb88

The initial CDF for each frame is stored in
the frame context. CDFs for actual coding are
stored in the tile structures, and these are
what get adapted. The initial CDF is replaced
by an average CDF derived from these tile CDFs.
This is carried forward to future frames when
backward adaptation is on.

CDFs are no longer set from the 8 bit probabilities
in backwards adaptation.

For now, 8 bit probabilities are maintained for
use in the encoder and for symbols which do not
have a CDF.

Change-Id: I106b30510bfad1fa57d077f7702acc1864378a09

Generated using av1_tree_to_cdf().

Note: These are currently overwritten by CDFs generated from default
probability tables. But they will be used eventually when we remove the
default probability tables.

Change-Id: I41a6047fd13e05156a50b2d54349ffdd7e1e4c4a

Add extra entries to the 'default_intra_ext_tx_prob' table when
ALT_INTRA is on.

Change-Id: I1b3d28fa06852b4b7c68b061c44318ec83be77b6

Removes domain transform recursive filters and non-approximate
guided filter code.

Change-Id: Ib7ae7a6b6526a0908b3dc1787ab3561442da4e2d

Also remove forward updates for delta_q when EC_ADAPT
is enabled.

Change-Id: Idf71b57bfe7763bc60595bc45768e624dd7b67bd

Change-Id: I49fc7c63b5a8db648856ee046e3209dc577f4067

Delta Q is coded with a single tree context.

Change-Id: Ie1e56c70285e948232049bfb4a51ad0e9ee25f75

No change in BDR.

Change-Id: I77551120a2e94dcbf818b039154495f0f9b21755

This will make it easier to add native CDFs for all the
dependent experiments without excessive macros.

Change-Id: Iee4710f0fe1c1b4300f686cdf2c5b879a36de987

This CL allow us to change filter coefficients easily for SIMD
implementation of high bitdepth convolution functions

Change-Id: I454a5c76d3ba9e4454118c6a9d87737b3aa24898

Change-Id: If5d4f6d261276d9cfdd59fd7779467d92f56c395

This commit produces a bit-exact bitstream because prior calls to code
 the tx_size using aom_write_tree() would automatically convert the
 aom_tree_index on the fly to a CDF.
The tx_size_cdf[]'s are now computed once per frame.
Based on recent tests, this patch reduces decode time by 4%.

Change-Id: I920dbf036b8a9574ea6e65ae5f9c43eef1c3f864

Symbol count is maintained in the position after the
last CDF value.

Change-Id: I1882e48bfb1404ea7b83ef410298484939601796

Change-Id: Ib1b5dde5d4c6479c968cd7d7a4a1d01abae1fcf6

Allows DomainTxfm filters to be turned off for experimentation.
Also expands the parameter set for the Self guided filters.

Change-Id: I68fdb8e079a2464d80b3a4a990005c49baaaf0b8

Change-Id: I070ee1acde80c99576d30f2611b6c653834b3e9b

BUG=aomedia:313

Change-Id: Ic1a9e20e5fd3f645d3be851d7be759cf4caf7c02

- Added comments for some tables and #defines for clarity.
- Renamed some variables to ensure we use "color_index" instead of
"color" for palette color index related variables.

Change-Id: Ica95a26e0f171a41a3259c8e6b3b891b8cd10151

Now that we have small number of contexts (5), use hash multipliers
(instead of base 11), so that color context hash is within a small
range. This allows us to use a lookup table to get color context
instead of a for loop.

Output bitstreams are bit-exact, so no change in compression.

Change-Id: I8cd8c893048c2fc6b22ccbd56f652d11486e2ee9

This reduces the complexity in a number of ways:
- We need just 3 neighbors instead of 4.
- Possible contexts reduce from 16 to 5.
- On hardware side, getting the contexts for a whole block will be more
parallelizable.

At the same time, compression performance improves very slightly:
- Screen-content set (videos) (Google): BDRate improved by 0.32
- screenshots set (images) (AWCY): PSNR improved by 0.62:
https://arewecompressedyet.com/?job=palette_withTR2%402017-01-27T21%3A30%3A28.890Z&job=palette_noTR2%402017-01-27T21%3A41%3A34.312Z

Change-Id: Ie84ca32f05d55ad481a51c2d3abc579468597189

If part of a block falls outside right and/or bottom image boundary,
then only store tokens for the part of it within the boundary.

Also, consider only the part of the block within the boundary when
calculating the number of colors in the image, deciding the base
colors for palette, RD calculation etc.

The part of color map corresponding to pixels outside the image
boundary is padded with color indices copied from same row/column.
This behavior is similar to how pixels outside the boundary are padded.

For screen_content set, this is improves compression performance by
0.038 overall. One clip, in particular, has a significant gain of 0.8.

Change-Id: I745ca032f313c5041aacc98c03ae4bfc33d840de

Resolve the broken coding pipeline in ext-inter experiment when
cb4x4 mode is enabled. Turn off rectangular inter-intra mode.
This needs some more work to hook up. Given that it gives fairly
limited coding performance gains, disable it for the moment.

BUG=aomedia:309

Change-Id: I9b406df6183f75697bfd4eed5125a6e9436d84b0

Change-Id: Id01c785ad48134075c4f6643233413564f0b8fbc

Change-Id: I2e39d2f23c8bb18878597e198b5ba7f98f07ecef

Offset the default probability set in motion_var to account for
the added block sizes in cb4x4 mode.

Change-Id: I18d90fda1678fad2fc738036e0d9caff6ac894b7

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

While sorting, preserving the order of the rest of the list when moving
an element to the top of list makes hardware implementation much simpler.

The compression performance is roughly same: overall, avg performance on
screen-content set is 0.137% better than before in fact.

Bug=aom:127

Change-Id: Id1aa1e90254b44eae9133b47bca8f853f6a62c6b

Change-Id: I0ebd6951d2b42869ae872b33f63a07db03e99c62

Change-Id: I0cacd4e8cdd07458b36bbdd56e4f005327854b34

Change-Id: Ic0eba16329d7b63dd7d18e9cd28b89be4b5f2710

Change-Id: Ia5046d9158d5421a7f6e0397f4fa1e1925ae2ccb

Change-Id: I1cf27d2f029c1e985cafb468f60e7117d92593f5

Change-Id: I3f7eeff102fc30e2cef59c2c07df94826587d100

Change-Id: I21785bec0563299b4b0c1d17aaaa788e4e8df4d7

Change-Id: I76259d6ec925a0c7024e7c70a517debe2d3bf1ab

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