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It's less invasive and helps make future changes easier.

Change-Id: I0f858462f14109ace4d76a31daeac4289c94bc6e

EXT_TILE: allocate variables on the heap due to the potentially
large number of tiles.

ANS: initialise tile contexts.

EXT_INTER, MOTION_VAR, WARPED_MOTION: fix compilation.

Change-Id: I43a9d01c2442d97b6a8875712f77d932dce3740d

Shear parameters for global motion are now computed once
when the parameters are determined.

Change-Id: Idfd53410079a81a81ddd4728f173a0d0ec60230b

Change-Id: Ie18fd2b8a3caf3948748ee353fe41e37f5803ba3

Change-Id: I8cd35f4697bc5ee90cfcb1fd37042770d6b5a544

Replace multiple calls for partition_cdf with a unified variable
in ec-multisymbol. This siliences a compiler warning in the
ec-multisymbol.

Change-Id: I56b07579e89e8fba565c4960d081817c86bc0097

Replace the use of num_4x4_log2 with the actual block size as the
condition to check if a block is partitionable. This avoids conflict
issues when multiple experiments are turned on.

Change-Id: I666d52458590a6f88c3995a140d20b0d66d27bfb

A bit and a three bit literal have been added to the uncompressed frame
header for use by the frame superres experiment.

The bit is true if scaling is to be used, and is immediately followed by
a three bit literal that encodes the scale to use. If the first bit is
false, scaling is disabled and the scale factor numerator is set to the
denominator (ie. 1:1 scaling). No literal follows if scaling is
disabled.

The denominator has been defined as a constant 16. The literal is biased
by a defined constant of 8 - allowing fractions from 1/2 to 15/16
scaling in steps of 1/16 when scaling is used. Experimentation will be
needed to discover which of these are useful.

The bit and literal are immediately after the optional render_width and
render_height, so that the superres parameters can be written and read
just after the regular width and height, without interfering with the
render_size parameters.

This patch also adds an arbitrary write to make the scale 1:1, so as to
not trigger any scaling until it's ready.

Accompanying encode and decode helper functions are added.

Change-Id: I8caa6247c73f5c7f84ef1fde1e80eb9b20bde0e3

Adds a variable length binary code library for
coding various symbols for typical use in headers.

The main codes implemented are:
1. Coding a symbol from an n-ary alphabet using a
quasi-uniform code.
2. A bilevel code for coding symbols from an n-ary
alphabet based on a reference value for the symbol
also taken from the same alphabet.
The code has two steps. If the symbol is close to
the reference a shorter code is used, while if it is
farther away a longer code is used.
3. A finite (terminated) subexponential code that codes
a symbol from an n-ary alphabet using subexp parameter k.
4. A finite (terminated) subexponential code that codes
a symbol from an n-ary alphabet using subexp parameter k,
based on a given reference also taken from the same
alphabet. This code essentially reorders the values
before using the same code as 3.

Also adds corresponding encoder side functions to count
the number of bits used.

These codes will be subsequently used for more efficient
encoding of loop-restoration parameters and global motion
parameters.

Change-Id: I28c82b611925c1ab17f544c48c4b1287930764b7

Initializing the tile context from the frame context
was missing in decode_tiles_mt().

Change-Id: I7758377cae85f5cc8adedc01a3086104c10d507b

Change-Id: If3a4c7e6aee747afd675e0233560f6e721c10f79

Chroma now has a list of strenghts too, with the superblock signalling
shared between luma and chroma.

low-latency, cpu=4:

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
-0.0114 | -1.4626 | -1.4745 |  -0.0423 | 0.0430 | -0.0001 |    -0.7416

Change-Id: I389c77f1d80020f810e45f8502c656ad9d397c8c

Change-Id: I2f4a5c836905b089b91b211368bf3a0dea682b75

We now signal joint strengths and use a greedy algorithm for the search.

low-latency, cpu-used=4:

ll4-cdef@2017-03-22T03:42:10.815Z -> ll4-cdef-newsearch-var-header-newlambda-refine4@2017-03-22T15:56:46.471Z

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0792 |  0.3551 |  0.4393 |  -0.0108 | -0.1338 | -0.0141 |     0.1452

Change-Id: I619ae1c7c7d7ec04fe993cabc5773b07c3f5b201

The feature is implemented in the following two functions.
av1_write_txb_probs
av1_read_txb_probs

Change-Id: I0b646e17ec54d7a10a77a6853439217091455af1

Change-Id: I08e4bbbef788079e27410359e5e0b1ad8542f72a

Change-Id: Id70fbfbca6c53a0aa15ff5606bb972e7412b3ed0

Delta quant doesn't make sense if the intent is to encode
the frame in lossless mode.

BUG=aomedia:393

Change-Id: Ic26e30267dd3a061d7ee5e980b6950366f06b32f

Change-Id: I4d43d33725a5a0e6fdfa1168d1397cb122366b19

Change-Id: I45c8e26214cedb822ee5c38556ad03e3f2ad66a5

Change-Id: Id7cbb89ba344770297ef42bf1b09a2b9ba5a1378

Use cdf to signal intra filter type.
Skip forward update when ec-adapt is on.

Change-Id: Idd446e081b8e9ea33356e60423b372bfd85a80db

Change-Id: I3f059dc16124bbce2210296de5b884b5906ec182

ec_multisymbol+ext_partition_types:
base_ext_types@2017-03-15T18:24:38.012Z -> 8565_3_ext_types@2017-03-17T18:29:48.794Z

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0346 | -0.0343 | -0.0341 |  -0.0345 | -0.0345 | -0.0344 |    -0.0345

ec_multisymbol+ec_adapt+ext_partition_types:
base_adapt_ext_types@2017-03-15T18:27:31.704Z -> 8565_3_adapt_ext_types@2017-03-17T18:30:01.108Z

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0422 | -0.0420 |     N/A |  -0.0425 | -0.0423 | -0.0423 |    -0.0420

Change-Id: Ia40f118f0faf546be13e02ec9ed584dd38529a59

Enabling SEPARATE_GLOBAL_MOTION will remove the ability for
a block that uses zeromv with global motion to pick warped_causal
or obmc_causal as the motion mode. When this is enabled there is:

0.05% drop on lowres for global + warped enabled
0.15% drop on midres for global + warped enabled

0.12% drop on lowres with global + motion var enabled
0.07% drop on midres with global + motion var enabled
No performance change for global, warped, or motion var individually.

Change-Id: Idbfb8dd7a93da14902438504b06a08e5212e48cb

* Dering and clpf were merged into a single pass.
* 32x32 and 128x128 filter block sizes for clpf were removed.
* RDO for dering and clpf merged and improved:
  - "0" no longer required to be in the strength selection
  - Dering strength can now be 0, 1 or 2 bits per block

              LL    HL
PSNR:       -0.04 -0.01
PSNR HVS:   -0.27 -0.18
SSIM:       -0.15 +0.01
CIEDE 2000: -0.11 -0.03
APSNR:      -0.03 -0.00
MS SSIM:    -0.18 -0.11

Change-Id: I9f002a16ad218eab6007f90f1f176232443495f0

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

This function allows us to set breakpoint when error happens.

Change-Id: I0074a26142625fb95728ed6aa003453ab4203c0f

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

Change-Id: Ib7ae7a6b6526a0908b3dc1787ab3561442da4e2d

The restoration tilesize can be now chosen as either 256, 128
or 64 at the frame header.

Change-Id: I852fc42afedc053484d657bdca522de73aaacd67

The variable "use_hbd" was defined but not used in four places in the
codebase. The warning that it wasn't used was missed by Jenkins
because it only tries one experimental flag at a time, but these
definitions were inside nested experimental flag conditions. Both
CONFIG_WARPED_MOTION and CONFIG_AOM_HIGHBITDEPTH had to be set for the
variables to be defined.

This patch deletes the unused definitions to remove the unused variable
warnings when the AV1 encoder and/or decoder are built with warped
motion and high bitdepth configured.

Change-Id: I9e80523db05a7a19cebe3ec8085a4a1e4b198c52

Change-Id: Ie20bd0b05bbf3128933f10787aade7b63c98b52a

* Run 45 degree wavefront coding for palette index
with palette_throughput experiment.
* Remove palette index interleave.

Change-Id: Ibb57004401f817dec8b00bc2a941d70a26783ff9

Also remove forward updates for delta_q when EC_ADAPT
is enabled.

Change-Id: Idf71b57bfe7763bc60595bc45768e624dd7b67bd

Change-Id: I378eb5b2c03a4c30d261128bcf9ef00ea987ed40

Split it into two experiments:
q_adapt_probs: multiple initial coeff prob tables based on q-index
subframe_prob_update: multiple backward prob updates within frame

Change-Id: I78041ebd4ba34afc9152f6861225f63c2e8eb686

Delta Q is coded with a single tree context.

Change-Id: Ie1e56c70285e948232049bfb4a51ad0e9ee25f75

Removes redundant deblocking filtering operations and buffer copies,
during search for the restoration filters.
Also, makes the order of cdef and loop-restoration consistent.

BUG=AOMEDIA:373

Change-Id: I571e331f9dfadfd2c1494f279e50510ec212ea29

This change improves efficiency and means that tile groups
cause negligible loss (+0.03% BDR) in the current default
encoding configurations (1 tile group no matter how many tiles)
with frame-based wrapping.

In future, when wrapper formats support tile groups, lengths
can be omitted from the last tile in every tile group.

Change-Id: Ia701e6720208fbfa727f9aef0b692a6aafbcc93f