+0.2% SSIM and glbPSNR on derfraw300.

Change-Id: I9cba0bca55e606a22f557c7732b064f738efe84d

Current partition checking starts from small sizes, and then goes up
to large sizes. This experiment uses the small partitions' motion
estimation result, which is already available, to speed up the
large partition's motion estimation. We can decide to skip some
patition checkings if they are unlikely choices. We could use the
motion vector(MV) result as current partition's prediction MV, limit
the search range and reference frame.

Current result at speed 1:
psnr loss: 1.19% for stdhd, 0.287% for derf.
speed gain: 14% for sunflower(hd), 11% for akiyo.

Further improvement will be done later.

Change-Id: I5abfd070e9cace2e91e2a0247d1325df313887ab

Use an estimate based on DC_PRED for intra uv cost
within the rd loop then only do a full uv mode analysis
if an intra mode is chosen.

Significant speed gains in some cases. Currently only
enabled for speed 2 pending speed/quality tests.

Change-Id: Ie851a12400d5483bce47ec0e3ccb8516041e91c0

Apply limit if search_method == USE_LARGESTALL
to the range of UV tx sizes searched.

Change-Id: I6db29f0dd237285ffc50d75a37e8b68151ad821c

This commit makes the encoder to perform motion search only once
per reference frame type for each 4x4/4x8/8x4 block. For bus_cif
at 2000 kbps, the runtime goes from 253812ms -> 217817ms
(14% speed-up) for speed 0.

Change-Id: I5f17599ccc8cfaf93ccb4f98fcb6008af6d79e92

Change-Id: I4884cdc2557d25d50c7c4f7e19b1ad8bdb93cd63

Removing tile_rows and tile_columns from VP9Common, removing redundant
constants MIN_TILE_WIDTH and MAX_TILE_WIDTH, changing signature of
vp9_get_tile_n_bits.

Change-Id: I8ff3104a38179b2c6900df965c144c1d6f602267

s/frame_rate/framerate/g

Change-Id: I6fc3e088e419c5f46e3a9390dd8a2cad2677a2fc

Making implementation of vp9_set_pred_flag_{seg_id, mbskip} consistent
with vp9_get_segment_id without using confusing sub(a, b) macro. Passing
mi_row and mi_col to functions explicitly instead of replying on
mb_to_right_edge and mb_to_bottom_edge.

Change-Id: I54c1087dd2ba9036f8ba7eb165b073e807d00435

Change-Id: I94b97a966b5efbc9a243048f1f5ddbbdc4b1846e

This is a short term optimization till we work out a decoder
implementation requiring no frame border extension.

Change-Id: I02d15bfde4d926b50a4e58b393d8c4062d1be70f

Removing unused and duplicated constants, moving them from *.h to *.c
if possible.

Change-Id: Ief4d6b984a3ca2e9b38504f0d855ed072cf7133f

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

Also inline some of the block calculations to assist the compiler to
not do silly things like calculating the same offset (or converting
between raster/transform block offset or block, mi and pixel unit)
many, many, many times.

Cycle times:
4x4:     584 ->   505 cycles (16% faster)
8x8:    1651 ->  1560 cycles (6% faster)
16x16:  7897 ->  7704 cycles (2.5% faster)
32x32: 16096 -> 15852 cycles (1.5% faster)

Overall, this saves about 0.5 seconds (1min49.8 -> 1min49.3) on the
first 50 frames of bus (speed 0) @ 1500kbps, i.e. 0.5% overall.

Change-Id: If3dd62453f8e2ab9d4ee616bc4ea956fb8874b80

Skip the inverse transform and reconstruction of inter-mode coded
blocks in the rate-distortion optimization loop, when skip_encode_sb
feature is turned on. This provides about 1% speed-up at speed 0,
and 1.5% speed-up at speed 1. No performance change in both settings.

Change-Id: I2932718bf4d007163702b61b16b6ff100cf9d007

This speed feature allows the encoder to largely remove the spatial
dependency between blocks inside a 64x64 superblock, thereby removing
the need to repeatedly encode superblocks per partition type in the
rate-distortion optimization loop.

A major challenge lies in the intra modes tested in the rate-distortion
optimization loop. The subsequent blocks do not have access to the
reconstructed boundary pixels without the intermediate coding steps.
This was resolved by using the original pixels for intra prediction
in the rd loop, followed by an appropriately designed distortion
modeling on the quantization parameters. Experiments also suggested
that the performance impact is more discernible at lower bit-rate/psnr
settings. Hence a quantizer dependent threshold is applied to deactivate
skip of block coding.

For bus_cif at 2000 kbps,
speed 0: runtime 269854ms -> 237774ms (12% speed-up) at 0.05dB
         performance loss.

speed 1: runtime 65312ms  -> 61536ms, (7...

frames_since_golden / frames_till_alt_ref_frame are unused.

Change-Id: I348e7689d4d75412cf4de7703d885be942e4a26b

Change-Id: Id9b6ceeddca3f9b34bfada5c499b1e7a2f42c30b

this was never fleshed out in the context of VP8, for which it was
added. for VP9 it has no meaning.

Change-Id: Iba2ecc026d9e947067b96690245d337e51e26eff

Also removing unused declarations from vp9_entropymode.h file.

Change-Id: Ib9c5826db3584a32f6bb3297a76c522b99d83402

Change-Id: I23a75c495ed7ea917d7f312bef0990e20a6b53d9

lg2 -> log2

Change-Id: I0602ddff49e42c9c40c29c084d04b7592b9f8edf

Implements some of the helper functions more efficiently with
lookups rathers than branches. Modeling function is consolidated
to reduce some computations.

Also merged the two enums BLOCK_SIZE_TYPES and BlockSize into
one because there is no need to keep them separate (even though
the semantics are a little different).

No bitstream or output change.

About 0.5% speedup

Change-Id: I7d71a66e8031ddb340744dc493f22976052b8f9f

Removing redundant function arguments and curly braces.

Change-Id: I46e02561f33fe02e84a3b19756f03b9504bd6a1b

For some reason iOS builds take a really long time to sort this
function out.

It's not used anywhere so remove it.

Change-Id: Ia5c8513a0d9c7eb32641cca58ca1c1113e2dd9f4

Change-Id: I78a79fc51c2d7cc3c261f35b569155397f3dc0c4

Change-Id: Iccd4ab95ea51a6d57ed43947f2fd7ad92e8979cf

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

The function encode_block is called only by inter-prediction modes,
hence removing the transform type branching there.

Change-Id: I34a3172e28ce2388835efd0f8781922211bff857

With sf->auto_mv_step_size on it is questionable
whether sf->reduce_first_step_size is worthwhile.
At speed 2 it was not having a big impact.

Even at speed 2 sf->optimize_coefficients = 0 is not
having a big speed imapct so for now I have moved it
down into a higher speed setting.

Change-Id: I8a54de76d486ad37aabce76474889da2768b14c1

Change-Id: Ia942e56cf322821d42ba06178672791eeee2847e

Change-Id: I0543e72fa092eef3976b65e16bb597197c364873

This commit fixed the mis-use of the tx_type for inverse transform
in intra4x4 rate-distortion optimization loop. It improves the
overall coding performance.

Change-Id: I7fe9953175b74890357dbcee33c138573766e980

Change-Id: Ic5257fa8278e9b6297de230e4fd26a1e23ad2bb7

Change-Id: I5dea4570cb05df27a522abf6e7b695998654284a

Change-Id: Ie0cb732fdcb98616a422c4463bff80642248d136

Adds a speed feature to eliminate full-rd computation if the modeled
rd or rd based on a different parameter in the same mode is already
a lot larger than the best rd yet.

Specifically, only search the sharp and smooth filters if the modeled
rd cost based on the  regular filter is within a certain factor of the
best rd cost so far. Also, skip full-rd computation of non splitmv
inter modes if the modeled rd cost based on pred error is within the
same factor of the best rd cost so far.

Also adds some enhancements in the rd search for splitmv mode to
speed things up by early breakouts. Negligible impact on performance.

Resuts on derfraw300:
psnr:    -0.013% with the splitmv enhancements, -0.24% with the rd
         breakout feature on.
speedup: 6% with splitmv enhancements, 20% with also residual breakout
         (tested on football sequence at 600 Kbps)

Change-Id: I37abc308ea9f110c1679ce649b6a7e73ab1ad5fc

This commit enables 16x16 ADST/DCT forward hybrid transform using SSE2
operations. It reduces the runtime from 5433 cycles to 1621 cycles, at
no compression performance loss.

Change-Id: I75fd7f1984e9e28846af459f810ff0d6ae125230

Encode time of first 50 frames of bus (speed 0) @ 1500kbps goes from
2min4.9 to 2min3.1, i.e. a 1.4% speedup overall.

Change-Id: I9b25e87974430cb942caa276410bb2eda815bd83

Change-Id: I721ebdeef2b53ce3e5c3eba3f7462ae2103c95a8