Cycle times:
4x4:    151 to  131 cycles (15% faster)
8x8:    334 to  306 cycles (9% faster)
16x16: 1401 to 1368 cycles (2.5% faster)
32x32: 7403 to 7367 cycles (0.5% faster)

Total encode time of first 50 frames of bus @ 1500kbps (speed 0)
goes from 1min39.2 to 1min38.6, i.e. a 0.67% overall speedup.

Change-Id: I799a49460e5e3fcab01725564dd49c629bfe935f

Adding segmentation struct to vp9_seg_common.h. Struct members are from
macroblockd and VP9Common structs. Moving segmentation related constants
and enums to vp9_seg_common.h.

Change-Id: I23fabc33f11a359249f5f80d161daf569d02ec03

Encode time of bus (speed 0) 50 frames @ 1500kbps goes from 2min14.4 to
2min10.1, i.e. a 2.3% overall speed increase.

Change-Id: I3699580e74ec26c7d24e03681bc47ba25ee1ee87

Total encoding time for first 50 frames of bus (speed 0) @ 1500kbps
goes 2min34.8 to 2min14.4, i.e. a 10.4% overall speedup. The code is
x86-64 only, it needs some minor modifications to be 32bit compatible,
because it uses 15 xmm registers, whereas 32bit only has 8.

Change-Id: I2df53770c2e850813ffa713e1a91b45b0082b904

This commit replaces zrun_zbin_boost, a method of biasing non-zero
coefficients following runs of zero-coefficients to be rounded towards
zero, with an explicit skip-block choice in the RD loop.

The logic is basically that if individual coefficients should be rounded
towards zero (from a RD point of view), the trellis/optimize loop should
take care of it. If whole blocks should be zero (from a RD point of
view), a single RD check is much more efficient than a complete
serialization of the quantization loop.

Quality change: derf +0.5% psnr, +1.6% ssim; yt +0.6% psnr, +1.1% ssim.
SIMD for quantize will follow in a separate patch. Results for other
test sets pending.

Change-Id: Ife5fa641163ac5150ac428011e87188f1937c1f4

Encoding time of first 50 frames of bus @ 1500kbps (speed 0) goes from
3min15.0 to 3min10.9, i.e. 2.1% faster overall.

Change-Id: If592ee99be09bcd34a7c8498347f44e7305e982c

Optimized the quantization function by making it a two-pass
process. The first pass does a quick checking of the transform
coefficients against the base ZBIN, and only keep the good
enough set of coefficients for quantization. A skipping
check is added. If all coefficients are within the base ZBIN, no
quantization is needed. The second pass is the actual quantization
pass, which only processes the coefficient subset determined
in first pass. This reduces the computation. Furthermore, an
alternitive method is used for large transform size, which often
has sparse nonzero quantized coefficients.

Overall, the encoder speedup is about 4%. The quantization function
itself gets 20% faster.

Change-Id: I3a9dd0da6db030260b6d9c314a9fa48ecae89f22

Removal from under configure flag.
A bit  renaming

Change-Id: I2213229dfe852001dfec16b149f47c52ce88f3aa

This is a mostly-working implementation of an extra channel in the
bitstream. Configure with --enable-alpha to test. Notable TODOs:

 - Add extra channel to all mismatch tests, PSNR, SSIM, etc
 - Configurable subsampling
 - Variable number of planes (currently always uses all 4)
 - Loop filtering
 - Per-plane lossless quantizer
 - ARNR support

This implementation just uses the same contents as the Y channel
for the A channel, due to lack of content and general pain in
playing back 4 channel content. A later patch will use the actual
alpha channel passed in from outside the codec.

Change-Id: Ibf81f023b1c570bd84b3064e9b4b8ae52e087592

Change-Id: If57e360c187a475fc90edb8c7170f498efcb31a5

Skip Q values between the q.0 mode and a real q of
2.0 as these are not valuable from an RD perspective.

Change-Id: I110c4858c57f97315953f4d88a2596d4764360df

Pull sb8x8 out of experimental list. verified via borg run tests.
Fixed unit test failures.

Change-Id: I12a4bbd17395930580c048ab68becad1ffe46e76

This allows removing a large number of transform size specific functions,
as well as supporting 444/alpha by routing all code through the
subsampling-aware path.

Change-Id: Ieb085cebe9f37f24fc24de179898b22abfda08a4

Creates a common encode (subtract, transform, quantize, optimize,
inverse transform, reconstruct) function for all sb sizes, including
the old 16x16 path.

Change-Id: I964dff1ea7a0a5c378046a069ad83495f54df007

Currently, only two values are used.  Removed the unused
values.

Change-Id: Idc5b8be354d84ffc68df39ea3e45f9f50d977b35

Work-in-progress, not yet ready for review. TODO items:
- bitstream writing (encoder) and reading (decoder)
- decoder reconstruction

Change-Id: I5afb7284e7e0480847b47cd0097cb469433c9081

Moving common code from encoder and decoder to vp9_get_qindex function.
Also moving quant-related constants from vp9_onyxc_int.h to
vp9_quant_common.h.

Change-Id: I70c5bfbaa1c8bf00fde0bfc459d077f88b6d46c8

Change-Id: I3a6d601e90e8740b9c26dd0afbfe9d467b75d367

There were 4 variants of the quantize loop in vp9_quantize.c, now
there is 1.

Change-Id: Ic853393411214b32d46a6ba53769413bd14e1cac

Basic assumption: when talking about transform units, use b_; when
talking about macroblock indices, use mb_.

Change-Id: Ifd163f595d4924ff892de4eb0401ccd56dc81884

This data can vary per-plane, but not per-block.

Change-Id: I1971b0b2c2e697d2118e38b54ef446e52f63c65a

This data is fixed at the MB level, so move it to the common part
of MACROBLOCK.

Change-Id: Idd8c87118e501cdf0a202bd84c28b502a8234edf

Quantizers can vary per plane, but not per block. Move these values to
the per-plane part of MACROBLOCK.

Change-Id: I320a55e38b7b28b29aec751a4aca5ccd0c9b9326

This commit moves the coeff storage from the MACROBLOCK struct to its
per-plane part. The next commit will remove the coeff member from the
BLOCK structure so that it is consistently accessed per-plane.

Also refactors vp9_sb_block_error_c and vp9_sb_uv_block_error_c to be
variable subsampling aware.

Change-Id: I18c30f87f27c3a012119b6c1970d5fa499804455

Change-Id: Id4306ef6d65d4a3984aed50b775bdf48d4f6c438

This patch does not seem to give any benefits.

Change-Id: I9d2b4091d6af3dfc0875f24db86c01e2de57f8db

New names are y_dc_delta_q, uv_dc_delta_q, uv_ac_delta_q.

Change-Id: I4acae1fc23a4697ce2c5a5becb8dc28ef0a4b552

Change-Id: I697514efd6024e1b4153bbde58ae5e323b030981

More specifically, remove vp9_quantize_mb*, vp9_optimize_mb*,
vp9_inverse_transform_mb* and vp9_transform_mb*. Instead, use the
generic _sb* functions that take a size argument, and call them with
BLOCK_SIZE_MB16X16.

Change-Id: I33024afea95d3a23ffbc1df7da426e4645110f29

Merge sb32x32 and sb64x64 functions; allow for rectangular sizes. Code
gives identical encoder results before and after. There are a few
macros for rectangular block sizes under the sbsegment experiment; this
experiment is not yet functional and should not yet be used.

Change-Id: I71f93b5d2a1596e99a6f01f29c3f0a456694d728

Renaming Y1dequant to y_dequant, UVdequant to uv_dequant, QIndex to qindex.

Change-Id: I1c356e5f886deb3f8807dc212de9799b55b09d58

Continue migrating data from BLOCKD/MACROBLOCKD to the per-plane
structures.

Change-Id: Ibbfa68d6da438d32dcbe8df68245ee28b0a2fa2c

Start grouping data per-plane, as part of refactoring to support
additional planes, and chroma planes with other-than 4:2:0
subsampling.

Change-Id: Idb76a0e23ab239180c818025bae1f36f1608bb23

These are mostly just for experimental purposes. I saw small gains (in
the 0.1% range) when playing with this on derf.

Change-Id: Ib21eed477bbb46bddcd73b21c5c708a5b46abedc

Replaces the default tables for single coefficient magnitudes with
those obtained from an appropriate distribution. The EOB node
is left unchanged. The model is represeted as a 256-size codebook
where the index corresponds to the probability of the Zero or the
One node. Two variations are implemented corresponding to whether
the Zero node or the One-node is used as the peg. The main advantage
is that the default prob tables will become considerably smaller and
manageable. Besides there is substantially less risk of over-fitting
for a training set.

Various distributions are tried and the one that gives the best
results is the family of Generalized Gaussian distributions with
shape parameter 0.75. The results are within about 0.2% of fully
trained tables for the Zero peg variant, and within 0.1% of the
One peg variant.

The forward updates are optionally (controlled by a macro)
model-based, i.e. restricted to only convey probabilities from the
codebook. Backward updates can also be optionally (controlled by
another macro) model-based, but is turned off by default. Currently
model-based forward updates work about the same as unconstrained
updates, but there is a drop in performance with backward-updates
being model based.

The model based approach also allows the probabilities for the key
frames to be adjusted from the defaults based on the base_qindex of
the frame. Currently the adjustment function is a placeholder that
adjusts the prob of EOB and Zero node from the nominal one at higher
quality (lower qindex) or lower quality (higher qindex) ends of the
range. The rest of the probabilities are then derived based on the
model from the adjusted prob of zero.

Change-Id: Iae050f3cbcc6d8b3f204e8dc395ae47b3b2192c9

Change-Id: I44660975e9985310d8c654c158ee7a61291b5a08

This also changes the RD search to take account of the correct block
index when searching (this is required for ADST positioning to work
correctly in combination with tx_select).

Change-Id: Ie50d05b3a024a64ecd0b376887aa38ac5f7b6af6

This patch revamps the entropy coding of coefficients to code first
a non-zero count per coded block and correspondingly remove the EOB
token from the token set.

STATUS:
Main encode/decode code achieving encode/decode sync - done.
Forward and backward probability updates to the nzcs - done.
Rd costing updates for nzcs - done.
Note: The dynamic progrmaming apporach used in trellis quantization
is not exactly compatible with nzcs. A suboptimal approach has been
used instead where branch costs are updated to account for changes
in the nzcs.

TODO:
Training the default probs/counts for nzcs

Change-Id: I951bc1e22f47885077a7453a09b0493daa77883d

Split macroblock and superblock tokenization and detokenization
functions and coefficient-related data structs so that the bitstream
layout and related code of superblock coefficients looks less like it's
a hack to fit macroblocks in superblocks.

In addition, unify chroma transform size selection from luma transform
size (i.e. always use the same size, as long as it fits the predictor);
in practice, this means 32x32 and 64x64 superblocks using the 16x16 luma
transform will now use the 16x16 (instead of the 8x8) chroma transform,
and 64x64 superblocks using the 32x32 luma transform will now use the
32x32 (instead of the 16x16) chroma transform.

Lastly, add a trellis optimize function for 32x32 transform blocks.

HD gains about 0.3%, STDHD about 0.15% and derf about 0.1%. There's
a few negative points here and there that I might want to analyze
a little closer.

Change-Id: Ibad7c3ddfe1acfc52771dfc27c03e9783e054430

Consistent with VP8.

Change-Id: I8c316ee49f072e15abbb033a80e9c36617891f07