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End-to-end speed improvements: (measured on tempete_cif.y4m,
20 frames for encoder and all 260 frames for decoder)

* GLOBAL_MOTION encoder: ~10% faster
* GLOBAL_MOTION decoder: 100-200% faster depending on bitrate
* WARPED_MOTION encoder: ~2.5% faster
* WARPED_MOTION decoder: ~20-40% faster depending on bitrate

The improvement in the GLOBAL_MOTION decoder is particularly
large because its runtime is dominated by calls to warp_plane().

This introduces minor changes to the output of the warp filter,
but these should be rare.

Change-Id: I5813ab9e90311e27587045153c32d400b6b9eb92

- Witness the follow user-level speedup on AV1 baseline:
 Encoding time reduction: 4.26%
 Decoding time reduction: 25.35%

Change-Id: Ideaf3cd473ad45ed9256c80d5a5daed0a6e098cf

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

Replace hard coded numbers with macro defs.

Change-Id: I125ef4e4c8c3aead182c583522450626b730bbb3

Fix the corner case and use the right rate cost udpate for rd_debug.
This would make the var-tx pass rd_debug test.

Change-Id: Ib0fbd2d73030c0d150222c6b7c2dfffc0c6af085

Make the transform block partition context model support the
rectangular transform block size partition. The coding gains
from cb4x4 and var-tx are:
          cb4x4 + var-tx
lowres         4.3%
midres         2.6%

Change-Id: I6cc1413fbf6d7707ca7fd24300623a3f0118be7c

Replace all instances of Daala's OD_ACCOUNTING with those specified by
 CONFIG_ACCOUNTING.

Change-Id: Ibb59fc5df0ce4b0528b15296bf2f14029c414bc0

The generic coder now uses the AOM entropy coder API and no longer
 needs to include the entenc.h and entdec.h headers.

Change-Id: I213acb5b6bd8a3fe60dc096b83d76ae72315e9de

The functions aom_encode_pvq_split() and aom_decode_pvq_split() code
 the rest value as raw bits using the od_ec_enc_bits() and
 od_ec_dec_bits() functions.
These code bits in the reverse order as the aom_write_literal() and
 aom_read_literal() functions, so both the encoder and decoder must
 be changed at the same time.
This commit has no impact on metrics but is a bitstream change.

Change-Id: Iee79777f35aebbb23043a7efa7fe439af70348ba

The functions aom_laplace_encode_special() and
 aom_laplace_decode_special() code the rest value as raw bits using the
 od_ec_enc_bits() and od_ec_dec_bits() functions.
These code bits in the reverse order as the aom_write_literal() and
 aom_read_literal() functions, so both the encoder and decoder must
 be changed at the same time.
This commit has no impact on metrics but is a bitstream change.

Change-Id: I428d5a83dd108c3a54f3c1dbae2c7fd5e59f5726

A slight improvement for lowres and midres.

Change-Id: I377ba41034e1d70320e0c694d90a058e7809b129

Cherry-pick Daala da7896a7

Remove double negation and added a comment explaining that this is used
for visualization. This change does not alter the bitstream.

Change-Id: I2a01ed292cc5cfa4e1bfdbc08251da6bd2c27158

Change-Id: I4a0f0a775362e6e43cd28ed29bf83c912cdc7df5

Cherry-pick Daala 85433214
 Fully order the pvq search candidates
For portable and stable sorting, break ties.
Large differences in output were observed between AWCY and an OS X
 machine because of the platform qsort implementation.

Change-Id: I294dd2e167c1e0464c7f61f32d60ab478341446e

Change-Id: Id0653f8d3a643cbeb187b38d5067f5e36340f163

Change-Id: I1f66837151a955a9fde0c1b4670ab0fc1d318111

A previous commit 8e1d0f70 changed
the bitstreams due to change of scale of transforms. While the
change is expected, md5 for "decode_to_md5_av1" test needs to be
updated to reflected the change to avoid nightly test failures.

Change-Id: I57e0318c081c7c0609fe7d5ee97543239ce162d0

Change-Id: I7320074ff7bd95d833cba8afb04fcc0730392f1e

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

Measure the accuracy of each transform in terms of per coefficient basis.
Set up a accuracy limit corresponding to current transform
implementation.

Change-Id: Ib7db9680c963427e94e728bf453b66180ce30b89

Change-Id: I7c992c9aae895aebcfb5c147cb179cf665c0ac10

Rename encode_inter_mb_segment() so that it tells readers
that the function is only used for sub8x8 case.

Change-Id: I2d86d9efaf0e1e96446d9e2dec8a8d97772489a7

In encode_inter_mb_segment(), when BLOCK_8X4 or BLOCK_4X8 is
passed, the nested loop inside it iterates always twice.
(For BLOCK_4X4, loop iterates only once because encode_inter_mb_segment()
is called for each of 4X4 block.)
Then, the k for 1st iteration is always zero, and the k for 2nd
iteration is always (idy * 2 + idx) with either idy == 1 or idx == 1
depending on the sb_type.

Using "+=" there could mislead readers expecting that
the # of iterations is more.
And probably using simple assignment would be more proper here.

Change-Id: I7a11255eca13403bc090ba4f0cd4785db9f0e541

Change-Id: Icbd238c73323d11d60ca4da755b52c83cb11b8b5

Change the od_decode_cdf_adapt() function to take an aom_reader
 struct instead of an od_ec_dec struct.
Rename od_decode_cdf_adapt() to aom_decode_cdf_adapt().

Change-Id: I0713d2f56acfea3f67f1b4087c0feee77c2e25cb

Change the laplace_decode_special() function to take an aom_reader
 struct instead of an od_ec_dec struct.
Rename laplace_decode_special() to aom_laplace_decode_special().

Change-Id: I137ae9a4df3fb0fd0b54dea09f787f70a7d287f5

Replace the passed in bit accounting string from OD_ACCOUNTING with the
 current function name as ACCT_STR in preparation for the migration to
 CONFIG_ACCOUNTING.

Change-Id: Ib9946232b37cacfd88f6ff914b99e91c3d7b650e

Slight improvement in midres and hdres sets of 0.02% and 0.0.9%
respectively.

This is also a better design anyways.

Change-Id: I15b60b8836070a2132641e5b1d8e9f68df426c08

Casting function pointers to void* is undefined or illegal (depending
on C/C++ dialect) and should be avoided.  Data and code could reside
in different memory.  In theory function pointers could be 64 bit and
data pointers could be 32 bit, so conversion to and from void* could
change the value.

Change-Id: Ibb70e35f21dc307cb236aecd001e15a8a8d7f9ea

Change-Id: I56e741551f74624a84250d7565520db9c5127d1b

Disable warped motion mode when the model parameters are out of the
range of the new interpolation algorithm.
Performance: 1.1% lowres (was 1.2%)

Change-Id: I947ce3fd07e0d574d66333c1a729e85ba0294b4a

Change-Id: I487995f51737be882d4f2a4c7bbd6b87297b4f55

Performance drop with ext_tx and rect_tx on
       BDRate
lowres -0.028
midres -0.075
hdres  -0.054

Change-Id: I50f89b9e9785d82ab05c3276a3c8b22b4dcfd408

Change-Id: Iab1217c7eb006c72e86e4261576b775b7debafd3

Change-Id: Ie308a855c9c713dc7876ea171aa812ce57663c39

This resolves an out-of-boundary memory access issue in the encoding
process.

Change-Id: I9363f5a5a012880289e3370f66507126c609a41f

Fix the computation of distortion for blocks at frame boundary.

Change-Id: Ib32b95f25e28af42abe9144a7f589030bbaab463

Change-Id: I5c2e92469d8f87f7c565acd77f12535b3f58929a

Change-Id: I6e60d9083da8a2d8f7e182e4f12704eddd170df6

Separate the aom_read_cdf() functionality from aom_read_symbol() which
 can optionally adapt the cdf when run with --enable-ec_adapt.

Change-Id: I5446d6402835dfcf68d3462a2bd8835704fe6603