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Make TX_4x4 as the minimum selectable transform size form bit-stream
syntax perspective. Use value 0 as the minimum supported transform
size unit for the block coding.

Change-Id: Ieb3167216a96aaddb0810a424ccaaf8ae896fec5

Change-Id: I4a6d84007bc17b89cfd8d8f2440bf2968505bd6a

Change-Id: Ia09edf92bf9f7ecacc65c232ac6e656cde236634

Move computing the segmentation_probs.tree_cdf table per symbol to
 computing it only when the probabilities are updated.

Change-Id: I3826418094bbaca4ded87de5ff04d4b27c85e35a

Use lookup table to replace the arithmetic computation for transform
block step.

Change-Id: Ie7cb33e75e3b90aa9e9b46f8d11fa1d03e1ebe85

Use the table access to retrieve pixel numbers from tx_size.

Change-Id: Ibf392dcfdf80606b6ab972d60550ed75cbe652db

Palette code originally by huisu@. Gives 11.68% BDRate improvement on
screen content set.

Last 7 small speedup patches from me, giving 10% speedup overall for
screen content set.

From aomedia/master:
Revert 57fa6267 : Remove color_index_map

From libvpx/nextgenv2:
c93e5cc3 : Bring palette back to nextgenv2
827e1b3f : Add test for screen content coding tools in end to end test
78b0bd0a : Complete (mostly) migration of palette mode
8a128c2a : Fixes for Palette mode
4ab00912 : Palette mode: record selected transform type
cbb8be76 : Set block size upper bound for Palette mode
bb0e6921 : Convert palette from double to float.
a0a23b7f : faster code: replace nested for loops by memcpy().
016a5daa : Palette code: simpler and faster duplicate removal
d0000208 : Palette code cleanup
6dde8018 : Use built-in qsort(); create remove_dup() method.
f746c103 : Handle centroid rounding inside palette.c itself.
d68c7b6d : Palette: count Y colors only for screen content.
f1906e96 : Palette code: remove the use of same if condition twice.

Locally made sure all combinations of "--enable-ext-intra" and/or
"--enable-palette" and/or "--enable-aom-highbitdepth" build OK.

P.S. Note for future reference:
EXT_INTRA experiment has only been moved *partially* to aomedia at this
point. If and when the rest is moved to aomedia, EXT_INTRA + PALETTE
combo needs to be moved to aomedia as well.

Change-Id: I8826780014ec8a88281e56c8258b7c966121b46f

Change-Id: Ic3a6855799be010e69aeab924b013679282ab191

Dead code.

Change-Id: I13ed4007865e45e41fc79dfb63cbd01500a1d3ae

Cherry-pick vp10 fd96aec9: Don't send segment probability updates when
 the map isn't updated.
This patch only effects --enable-misc-fixes.

Change-Id: Ia1acfc59e4f2e5383a26c786bdd90c02ac49df9f

Change-Id: Ifc065eb3eee0960be2e085e7e18478bf91bf56dd

Cherry picked from libvpx: 511da8cb

Change-Id: I4f4132235495adcd445690d8f060f607b755cacd

Move computing the partition_cdf tables per symbol to
 computing them only when the probabilities are updated.

Change-Id: I442f9230ba00be7f5d0558d7c38d7324ad009ee8

Move computing the inter_ext_tx_cdf tables per symbol to
 computing them only when the probabilities are updated.

Change-Id: I5e1e62f8eae8f6b2edbbd378beeb786649502c10

Move computing the intra_ext_tx_cdf tables per symbol to
 computing them only when the probabilities are updated.

Change-Id: I26d5e419e103093e98a7d896c196176305b50fc9

While we are at it:
- Rename some variables to more meaningful names
- Reuse some common consts from a header instead of redefining them.

Change-Id: I110491c071ae6f68378030493679d49fe670129a

- Change struct name to all caps SCAN_ORDER to be locally consistent.
- Rename struct pointers to 'scan_order' instead of hard to read short
  names 'so' and 'sc'.

Change-Id: Ia131f14320c1a18aa12654cdb87bf8008878950a

Move from computing the switchable_interp_cdf per symbol to
 computing once per frame when the probabilities are adapted.

Change-Id: I6571126239f0327e22bb09ee8bad94114291683e

For now this is in its own experiment for benchmarking purposes, but it
will eventually be folded into the main ANS experiment.

Change-Id: Icdb54b6ca3c0191ba717d6d10aaaffb11e2bebea

Change-Id: I371297e6ee000e6dc01ba1544763cbed429b0e5a

Remove the separate implementations of set_contexts() in encoder
and decoder.

Change-Id: I9f6e9b075532faae0f74f885d9443589254258a7

Change-Id: I61eb08862a101df74a6b65ece459833401e81117

Change-Id: I14e66bb18959a3d78d8befb9858c192901e0406b

Change-Id: I3ba5f7061f7a76a76e5c906132f33d4110a0dd87

Following supports are added in the decoder:
(1) Decoder support to show_existing_frame == 1;
(2) Decoder support to avoid the referring to non-reference frames;
(3) Decoder support to handle the case when cm->prev_frame gets retired
    in the reference buffer.

Change-Id: Ibe8590da8db26e18bcf149b9f155db71636ba890

For the experiment of EXT_REFS, add the handling of the context
probabilities for both forward reference frames (namely
LAST/LAST2/LAST3/GOLDEN) and backward reference frames
(namely BWDREF/ALTREF).

Change-Id: Ibd991673acf6ff2fc9a56b8805eca9173cbf5fdc

The decision framework in enc (without obmc mv refinement) and
reconstruction at both sides is implemented.

Performance gain: 2.229/2.000/1.915% lowres/midres/hdres
Encodinig time: +13%

Change-Id: I5ab634c17d7050f15ecf5d4145626d0eaa425058

Change-Id: I5d30e8f07373482d7d7a4aff5a2026e4314e32b1

PSNR gain
hbd lowres dataset: 0.811%
lbd lowres dataset: 0.895%

Change-Id: Id6cc426883de725adf1a630f4151d5018c4b819b

Change-Id: I5d36aba6870f0783577b80d46defda7604029382

This commit makes the encoder and decoder use the same motion
compensated prediction functions to simplify the codebase.

Change-Id: Ic492700bd003aec658e95cb39bcc2ba60bc6e2e4

Change-Id: Id8f45d9c11406fc301b39801c5228ccd6aa2d5d6

Change-Id: I077b0e97186bdd292f925e08966a2ca3cf8c250d

this matches style guidelines and stabilizes successive runs of
clang-format across the tree. remaining types should be address in
successive commits.

Change-Id: I6ad3f69cf0a22cb9a9b895b272195f891f71170f

.c files were missed in the previous change

Change-Id: I9d22cd83e1f87472bfb09e6a38284396b2fcd860

This commit unifies the probability models for the dynamic motion
vector referencing system.

Change-Id: I2b8a5e3da9824b52779a6b8ef43b7a588eade93a

This commit converts the scalar motion vector probability model
into vector format for entropy coding contexted on the predicted
motion vector.

Change-Id: I09a17ed4d01efa49640c2882efbf78913b32556e

This commit enables entropy coding of the syntax elements used in
the dynamic motion vector referencing system.

Change-Id: If876c7df6402caf4b6daa3d511328da522e95233

This commit re-works the entropy coding scheme of the motion
compensated prediction modes. It allows a more flexible hyperplane
partition for precise classification.

Change-Id: Id02d4015a053affea9c19b1188873fbd7b906e92

Change-Id: If363eccaa8be7fb9f8cf41488bf3f5e6d4c00645