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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

ext_tile is not compatible with reference_buffer, this commit changes
to disable refrence_buffer when ext_tile is enabled.

BUG=aomedia:114

Change-Id: I6416f4c731bec1c4cfeab3cdb539f359627ed2e2

entropy_stats: to generate stats of various symbols encoded
masked_tx: new experiemnt for coding a smaller transform in a
           prediction block

Change-Id: I48baf0f1c37245c43031a9eda879ef49eee5e76b

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

Change-Id: I21eaa680b0b340da5401a2b893ad9c847495ab79

Change-Id: Ic587cddf04053bced6325b3cd5ce1b963e783393

Change-Id: I21013412174a2edefdc5e30ece0e8e857b99ac5e

This commit adds an experiment to interleave the coding of transform
coefficients from YUV planes.  The experiment can be enabled at config
time by --enable-coef-interleave.

Change-Id: Ifd92f9c367304bca9732f13fa026eb8996363677

Enable the ref-mv experiment by default.

Change-Id: Icb4f37aab0dc866430569f0ee82805de1498bee3

Change-Id: Iaaf9244678cde74cf3e216f3b8c9d293f206f27e

The rans experiment is dead. The ans experiment with the ec_multisymbol
experiment also turned on takes its place.

Change-Id: Ie9f30ec7cf73aae6b2ea580a7b1f208485a8a7a7

Change-Id: I9e2a8db4e59cb9c109e978e473749ebc4e910148

PVQ replaces the scalar quantizer and coefficient coding with a new
design originally developed in Daala. It currently depends on the
Daala entropy coder although it could be adapted to work with another
entropy coder if needed:
./configure --enable-experimental --enable-daala_ec --enable-pvq

The version of PVQ in this commit is adapted from the following
revision of Daala:
https://github.com/xiph/daala/commit/fb51c1ade6a31b668a0157d89de8f0a4493162a8

More information about PVQ:
- https://people.xiph.org/~jm/daala/pvq_demo/
- https://jmvalin.ca/papers/spie_pvq.pdf

The following files are copied as-is from Daala with minimal
adaptations, therefore we disable clang-format on those files
to make it easier to synchronize the AV1 and Daala codebases in the future:
 av1/common/generic_code.c
 av1/common/generic_code.h
 av1/common/laplace_tables.c
 av1/common/partition.c
 av1/common/partition.h
 av1/common/pvq.c
 av1/common/pvq.h
 av1/common/state.c
 av1/common/state.h
 av1/common/zigzag.h
 av1/common/zigzag16.c
 av1/common/zigzag32.c
 av1/common/zigzag4.c
 av1/common/zigzag64.c
 av1/common/zigzag8.c
 av1/decoder/decint.h
 av1/decoder/generic_decoder.c
 av1/decoder/laplace_decoder.c
 av1/decoder/pvq_decoder.c
 av1/decoder/pvq_decoder.h
 av1/encoder/daala_compat_enc.c
 av1/encoder/encint.h
 av1/encoder/generic_encoder.c
 av1/encoder/laplace_encoder.c
 av1/encoder/pvq_encoder.c
 av1/encoder/pvq_encoder.h

Known issues:
- Lossless mode is not supported, '--lossless=1' will give the same result as
'--end-usage=q --cq-level=1'.
- High bit depth is not supported by PVQ.

Change-Id: I1ae0d6517b87f4c1ccea944b2e12dc906979f25e

PVQ replaces the scalar quantizer and coefficient coding with a new
design originally developed in Daala. It currently depends on the
Daala entropy coder although it could be adapted to work with another
entropy coder if needed:
./configure --enable-experimental --enable-daala_ec --enable-pvq

The version of PVQ in this commit is adapted from the following
revision of Daala:
https://github.com/xiph/daala/commit/fb51c1ade6a31b668a0157d89de8f0a4493162a8

More information about PVQ:
- https://people.xiph.org/~jm/daala/pvq_demo/
- https://jmvalin.ca/papers/spie_pvq.pdf

The following files are copied as-is from Daala with minimal
adaptations, therefore we disable clang-format on those files
to make it easier to synchronize the AV1 and Daala codebases in the future:
 av1/common/generic_code.c
 av1/common/generic_code.h
 av1/common/laplace_tables.c
 av1/common/partition.c
 av1/common/partition.h
 av1/common/pvq.c
 av1/common/pvq.h
 av1/common/state.c
 av1/common/state.h
 av1/common/zigzag.h
 av1/common/zigzag16.c
 av1/common/zigzag32.c
 av1/common/zigzag4.c
 av1/common/zigzag64.c
 av1/common/zigzag8.c
 av1/decoder/decint.h
 av1/decoder/generic_decoder.c
 av1/decoder/laplace_decoder.c
 av1/decoder/pvq_decoder.c
 av1/decoder/pvq_decoder.h
 av1/encoder/daala_compat_enc.c
 av1/encoder/encint.h
 av1/encoder/generic_encoder.c
 av1/encoder/laplace_encoder.c
 av1/encoder/pvq_encoder.c
 av1/encoder/pvq_encoder.h

Known issues:
- Lossless mode is not supported, '--lossless=1' will give the same result as
'--end-usage=q --cq-level=1'.
- High bit depth is not supported by PVQ.

Change-Id: I1ae0d6517b87f4c1ccea944b2e12dc906979f25e

Change-Id: I9e2a8db4e59cb9c109e978e473749ebc4e910148