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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

ext-tile is incompatible, so when it is enabled, tile groups
will be disabled.

Change-Id: Ibf1728a7b576c7c6ad92a2a0de3145a8ecbed6d8

This patch adds a decoder control that exposes frame data via a simple
 callback.

Change-Id: Icae73ae6b5da8a7783db9fadb1fff4a85d77174b

Change-Id: I93bfff59810fe2d8e880012de02921ae857f300b

Change-Id: I5a2469d10f7295f1b8a6bea64e36b8325c8dca22

Add temporal motion vector referencing experiment flag.

Change-Id: I9a0fced67f4f94071bd6a38eacf9e4f311099c79

This is for level-map coefficient coding experiment

Change-Id: Id16c64da3749c91558824f98bdfe4c4982cd03cc

* code the palette color index using 45 wavefront
* interleave the coeff and palette color index in
  transform block level
* the above change does not change code efficiency

Details: 
The 45 wavefront scan allows to compute the ctx of
the diagonal samples' indices  at the same time. 
Interleaving palette indices and palette residual
on a transform block basis means that the entropy
 decoding and further processing of the palette 
residual is not delayed by the entropy decoding 
of all the color indices of the palette encoded 
block.
Change-Id: Ie9f576002a9a68394b99c23b01e9730df06df070

This allows compiling a codec using the same operating path (the generic
"high-bitdepth" one), regardless of the profile of the input bitstream.
For now, keep the 16-bit (generic) pixel operating path disabled by default.

Change-Id: Idd31a842b801a82c4918b1cfa7cc0bff5b11d060

daala_ec now works without ec multisymbol, ec_multisymbol was accepted
at the face to face meeting. Enable ec_multisymbol on its own and not as
a carryover with daala_ec.

Change-Id: I2f9d2523decd0641be6bc476c78cfd60f2e83a02

Support 2x2 chroma block size.

Change-Id: I2e06b26b23bc2e2286825c1acd5a607b47b154d7

"palette" experiment was adopted during the F2F meeting.

Change-Id: I8f6d6864b6d729935bd0d89d10b32194d4161e4b

Change-Id: Ib3797b7e0ea6050225a56464042deaa856f6a72f

The result is identical to enabling both deringing and CLPF

Change-Id: I71db5ba9e21fcaf11ad87e94841eaf80be58c0a8

This commit implements a new rate control system which was ported from
Daala's rate control system (which was based off of Theora's rate
control system) to the encoder. Its aim is to address the weaknesses of
the current rate control system and eventually serve as its replacement.

This is still work in progress. So far this commit only implements
support for single pass encoding for constant quality and bitrate
targeting.
Additional commits which implement two-pass support and the rest to
match the feature set of the current rate control system are coming
soon.

The rate control system hasn't been fully tuned (and will likely need
additional tuning as the encoder's development progresses) and does
contain some "hacks", to convert the quality to a quantizer value
(empirical) and to tweak the quantizer in between golden frames (which
uses some code from the current rate control system as well as code
which attempts to model what that code does), the latter of which is
only in the constant quality codepath.

Bitrate targeting works much better than the current rate control
system's targeting and will actually closely match the rate specified by
the user without the current rate control system's bursty behaviour.

Change-Id: I588fbfd2e80a3d21ce7176903115d6a96ef1700a

It is now possible to use daala_ec without ec_multisymbol by running:
 ./configure --enable-experimental --disable-ec_mulitsymbol.

Change-Id: I55a0473b887846f01ef832059cdbe31aebebce05

The use of raw bits is now disabled by default and can be turned on with:
 ./configure --enable-experimental --enable-rawbits
This commit has a negligible impact on rate.

subset1:

master@2017-02-14T18:57:22.282Z -> no_rawbits@2017-02-14T18:57:41.977Z

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0000 | -0.0000 | -0.0000 |  -0.0000 | -0.0000 | -0.0000 |    -0.0000

objective-1-fast:

master@2017-02-14T18:52:48.425Z -> no_rawbits@2017-02-14T18:52:04.489Z

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0001 | -0.0001 | -0.0001 |  -0.0001 | -0.0001 | -0.0001 |    -0.0001

Change-Id: I01e79e9f314565a64b224ca41047f7bd7fe33f70

Noticed that some ALTREF_FRAMEs could have used compound modes for its
prediction but have been labeled as SINGLE_REFERENCE mode in the frame
header. This experiment is to remove the COMPOUND_REFERENCE mode from
the frame-level reference mode choices and only leave SINGLE_REFERENCE
and REFERENCE_MODE_SELECT the two choices in the frame header.

When turning on both ext-refs and ref-adapt, compared against ext-refs
itself, a small gain is achieved. In PSNR, the bitrate saving gains are
as follows:

lowres: Avg -0.120%; BDRate -0.128%
midres: Avg -0.155%; BDRate -0.128%

Change-Id: I2cfff8a6b7eaa65ef863dbdbc4dd086d3b586f8c

Change-Id: Ibf160e83e7cb1c7dce8b40e7cbead48416440974

The new_tokenset experiment replaces the unconstrained tokenset with a
multisymbol alphabet in an inventive way.

Tested configurations:
new_tokenset + ec_adapt, new_tokenset, ec_multisymbol

Change-Id: I846ab2e51c2a1dc3f2f9904ed8c47a8e98f853c5

Change-Id: I1050b69045407381d4626b65a0bf6f35957a66f4

Change-Id: Ib90be26f69c658a6be6e133097c41845db58b6e1

This commit renames deblocking_across_tiles to loopfilter_across_tiles, 
to get ready for dering and clpf integration.

Change-Id: Id25b051da9b1e5cb92f35a9619662597462d9537

Change-Id: I02a019b1c11b3ee4ae32d424cb6ef2f8ae554824

This experiment implements the idea of the uniform tri-prediction,
which adds a 3rd inter prediction on top of the existing compound
inter bi-prediction. The final predictor for an inter-coded block is
the average of the compound bi-predictor and the third predictor,
which is indentified by a third reference frame and a third motion
vector.

Change-Id: I7ca8435a441960e7d9702fa09614ed7ae9d0ab02

Change-Id: I2a490e144099d7692296992528192c1f11d2c06f

this was superseded by the addition of -std=c99

BUG=aomedia:111

Change-Id: Ib89125b6f2e259b52ae35af26e882f9b02ef2c27

ext-partition needs a slightly bigger stack.

Change-Id: Ib727cfd5b3526b18d8c7306ddb33a490bb885834

Change-Id: Ieb2922c3df4ef4f8514b8a6df6f9a8fc45ef3cf4

This commit adds a new experiment, Daala's distortion function,
which is designed to better approximate perceptual distortion
in 8x8 pixel blocks.

This experiment is expected to work best with PVQ.

It measures the variance of overlapped 4x4 regions in the 8x8 area,
then uses these variances to scale the MSE of weighted frequency domain
distortion of 8x8 block.

Since AV1 calculates distortion in blocks as small as 4x4, it is not possible to
directly replace the existing distortion functions of AV1,
such as dist_block() and block_rd_txf().
Hence, there has been substantial changes in order to apply
Daala's 8x8 distortion function.
The daala distortion function is applied
after all 4x4 tx blocks in a 8x8 block are encoded (during RDO),
as in below two cases:
1) intra/inter sub8x8 predictions and
2) 4x4 transform with prediction size >= 8.

To enable this experiment, add '--enable-daala-dist' with configure.

TODO: Significant tuning of parameters is required since the function has
originally came from Daala thus most parameters would not work
correctly outside Daala.
The fact that chroma distortion is added to the distortion of AV1's RDO is
also critical since Daala's distortion function is applied to luma only
and chroma continues to use MSE.

Change-Id: If35fdd3aec7efe401f351ba1c99891ad57a3d957

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

NCOBMC (non-causal obmc) allows overlapped prediction that takes
mvs from blocks at positions with non-causal relation (e.g. at the
bottom, or to the right) to the current block.
This experiment will be a sub-experiment of MOTION_VAR, so will only
be effective when MOTION_VAR is on.

Change-Id: Ie3aa9591e1c15f5cc251664ea3c146210a5010cf

Change-Id: Ie308a855c9c713dc7876ea171aa812ce57663c39

Change-Id: I8dcf7b4284da391c63ae5afc4b7637394b862cd8

This commit adds a new experiment to allow disabling of loop filtering
on tile boundaries. It is implemented by adding a syntax field
"loopfilter_across_tiles_enabled" into the uncompressed frame header. 
If it is set to 0, decoder and encoder will disables loop filtering for
block edges that are also tile boundaries.

Change-Id: Ib80bfd82d49c74f1ba46ae18ceedb30704ac8aa5

this is a precursor to requiring toolchains to support c99

BUG=aomedia:111

Change-Id: Ic501ea074e738fe7870ce3f56fb6e87a509632fd

This commit adds a compiler flag to gcc to warn stack size greater
than 300Kbytes.

Change-Id: I4bd0680de435373fc46bfd8d5b80a610dbaddad8

Also make sure that qindex is clipped to the quantizer range.

Change-Id: I3163da4b45e190f9ab34982d1bbbefa5cba7514e

This patch reverts ca4782bb: Disable daala_ec when ext_tile is enabled.
Certain tests in superframe_test.cc were disabled for only ans that
 should have been disabled for both ans and daala_ec.
This was corrected in d526d0a8 and now the unit tests pass with
 --enable-daala_ec and --enable-ext_tile.

Change-Id: I76244bb4d687040dbd504475c31361933830943d

Experiment ext_tile is not compatible with daala_ec yet, this commit
disables daala_ec and enable ans if ext_tile is enabled.

A follow-up commit should resolve the underline conflicts within
ext-tile experiment.

BUG=aomedia:116

Change-Id: If60cb170e908a844dc8d22efce82f2a2c01b391b