A previous commit 76feb965 made the vp8_mode_context adaptive on a frame
frame basis, this commit further made the coding context adaptive to two
frame types separately. Tests on derf set showed a further small gain on
all metrics: avg psnr 0.10%, glb psnr: 0.11%, ssim: 0.08%

http://www.corp.google.com/~yaowu/no_crawl/newNearMode_1209.html

Change-Id: I7b3e32ec8729de1903d14a3f1213f1624b78cdee

Experiment with old Q range but new higher precision quantizer
and transform code.

Change-Id: Id1ff4cb433e5775d709d0133e2aec0322975c292

The commit fixed a problem by capping cpi->active_best_quality to be
smaller than cpi->worst_quality.  Also fixed a few line of code that
was misplaced.

Change-Id: Ie908264b72140c669122a0afde5d886619c33474

This commit removed the macro CONFIG_MULCONTEXT, which was used to
indicate the experiment code for using separate context for altref
and normal frames. This commit made the change fully merged in.

Change-Id: I525f927f68e2365d37b340ef23b836a136a4f70b

This commit removed the macro CONFIG_I8X8, which was used to indicate
the 8x8 intra prediction experiment, made the change fully merged in.

Change-Id: Iafa4443781ce6e83f5591c12ba615a0e92ce0ea0

vp8_mode_contexts[] is an entropy table used to code inter mode
choices. It was a fixed constant table. This commit made the entropy
context adaptive. Tests on derf set showed very good consistent gains
on all metrics: avg psnr .47%, overall psnr .46% and ssim .40%.

http://www.corp.google.com/~yaowu/no_crawl/newModeContext.html

Change-Id: Ia62b14485c948e2b74586118619c5eb2068b43b2

The MODE_STATS macro was used to #ifdef around code for mode entropy
stats collection, this commit fixed a crash when MODE_STATS is on.
The commit also changed a number of array definitions to use defined
macros instead of hard-coded numbers.

Change-Id: I114592f53a1e44e31e455f5725f036ae6168735a

fixed issues caused by conflicts between two experiments.

Change-Id: I56a9bd69493e4850c121ea057a6233c55777c2a5

Because the variable doesn't distinguish between DC and non-DC
prediction, but rather between 16x16 or 4x4 prediction.

Change-ID: Ia4e7dda2bd6230c91515072e3277be2d64e42629

Change-Id: I5f9fc894e6a332d9be6d7336c7c5fe11e65b8498

This patch introduces the concept of dual inter16x16 prediction. A
16x16 inter-predicted macroblock can use 2 references instead of 1,
where both references use the same mvmode (new, near/est, zero). In the
case of newmv, this means that two MVs are coded instead of one. The
frame can be encoded in 3 ways: all MBs single-prediction, all MBs dual
prediction, or per-MB single/dual prediction selection ("hybrid"), in
which case a single bit is coded per-MB to indicate whether the MB uses
single or dual inter prediction.

In the future, we can (maybe?) get further gains by mixing this with
Adrian's 32x32 work, per-segment dual prediction settings, or adding
support for dual splitmv/8x8mv inter prediction.

Gain (on derf-set, CQ mode) is ~2.8% (SSIM) or ~3.6% (glb PSNR). Most
gain is at medium/high bitrates, but there's minor gains at low bitrates
also. Output was confirmed to match between encoder and decoder.

Note for optimization people: this patch introduces a 2nd version of
1...

Resolved or factored out some further issues with Q index.
Put in a 3rd order polynomial instead of less accurate power function
as the best fit on gf and kf boost adjustment.
Added avg_q value to use instead of ni_av_qi.
Compute segment delta Q values based on avg_q.
Fixed bug in adjust_maxq_qrange().

The extended range Q on the derf set, using standard data rates
(which do not extend high enough to get big benefits) still show
a shortfall of between 0.5 and 1% though so there would appear to
be further issues that need to be tracked down.

Change-Id: Icfd49b9f401906ba487ef1bef7d397048295d959

CNT_INTRA has been used for counting (0,0) motion vectos, this commit
renames it to CNT_ZEROMV

Change-Id: I8f67c5468370090525faf84ba5b3f780d302443f

Change-Id: I17d9c1246d69e102297ec1c3efb359691b3da313

Added two experimental options to the configure script:
1. newnear:
   new scheme of doing mv encoding that include a motion vector from
   last frame in nearest and near mv search
2. mulcontext:
   tracks entropy context separately for regular frames and alt ref
   frames.

Change-Id: If6e0d5d593351707b497a26eb6a763e080f77e6f

This commit added code to keep track of separate entropy contexts for
normal frames and alt ref frames. The underly assumption was that the
two type of frames have different entropy characteristics given they
typically have quite different quantization levels. By keeping entropy
contexts separate, it helps the entropy context distribution to be more
closely adapted to each frame type.

Tests on derf set showed a good and very consistent gain on all clips
on all metrics, avg psnr: 0.89%, overall psnr: 0.84% and ssim 0.93%.

http://www.corp.google.com/~yaowu/no_crawl/mulcontext.html

Change-Id: I15bc9697f6ff7829042911fe0c62930585d7e65d

This commit enabled the usage of 8x8 intra prediction modes on inter
frames. There are a few TODO items related to this: 1)baseline entropy
need be calibrated; 2)cost of UV need to be done more properly rather
than using decision only relying on Y; 3)Threshold for allowing picking
8x8 intra prediction should be lowered to lower than the B_PRED.

Even with all the TODOs, tests showed consistent gain on derf set ~0.1%
(PSNR:0.08% and SSIM:0.14%). It is assumed that 8x8 intra prediction
will help more on large resolution clips, especially with above TODOs
addressed.

Change-Id: I398ada49dfc32575cfab962a569c2885111ae3ba

Fixed some further QIndex related issues and replaced some tables
(eg zbin and rounding)

Also Added function (currently disabled by default) to populate the
main AC and DC quantizer tables. Using the original AC range the
resulting computed DC values give behavior broadly comparable
on the DERF set. That is not to say that the equations will hold good
over a more extended range. The purpose of this code is to make it
easier to experiment with further alterations to the Q range and distribution
of Q values plus the relative weights given to AC and DC.

The function find_fp_qindex() ensures that changes to the Q tables
are reflected in the value passed in to the first pass code.

Slight experimental adjustment to static segment Q offset.

Change-Id: I36186267d55dfc2a3d565d0cff7218ef300d1cd5

Change-Id: I95fab6f51967008acf1bc9e98fdb7bb56974807f

this commit is to add an variable in the macroblock level mode
info structure to track the transform size used in each MB, so
the information can be used later in the loop filter to change
how loop filter works on MBs with different transform sizes.

Change-Id: Id0eeaba6cc854c6d1be00ed8d237b3d9e250e447

Slight tweaks to the new minq equations to bring results more into line with
original lookup tables.

Change-Id: I969fc87d95912df549b6775e83ee2345e84d4da0

Addressed a couple of other QIndex dependencies.

Change-Id: I15b224bffd0210d3c7065cb6905156f2ca8e9ea9

Fixed bug in firspass.c call to vp8_initialize_rd_consts()

This was passing in vp8_dc_quant(cm->base_qindex, cm->y1dc_delta_q)
 instead of (cm->base_qindex + cm->y1dc_delta_q).

It just so happens that for the value 26 used for cm->base_qindex in the
unextended Q case,  the two give similar results. However, when using
the extended Q range the two are very different.

Also added more stats output and partly disabled another broken feature.

Change-Id: Iddf6cf5ea8467c44b7c133f38e629f6ba6f2581e

This is an experiment to include a mv contribution from last frame to
nearest and near mv definition. Initial test showed some small though
consistent gain.

latest patch slightly better result ~.13%-~.18%.

TODO: the entropy used to encode the mode choice, i.e. the mv counts
based conditional distribution of modes should be re-collected to
reflect this change, it is expected that there is some further gain
from that.

Change-Id: Ief1e284a36d8aa56b49ae5b360c91419ec494fa4

This comitt brings accross changes from the public branch
commit number Icf74d13af77437c08602571dc7a97e747cce5066.

The main puurpose of this comit relates to CQ mode but it
also includes some refactoring of the two pass code which
I hope will make tuning the experimental branch for the new
quantizer range a little less painfull.

Change-Id: I278e989436a928fc1fe7761068960048f9d7a376

This commit resolves further QIndex look up tables to facilitate
experimentation with the quantizer range.

In some cases  rather than remove the look up tables completely
I have created functions that are called once  to populate them
using a formulaic approach base on the actual quantizer.

The use of these functions based on best fit of data from the original
tables does affect the results on some clips but across the derf test
set the effect was broadly neutral.

Change-Id: I8baa61c97ce87dc09a6340d56fdeb681b9345793

Removed unused variables lf_or_gf and frame_lf_or_gf.

Change-Id: I88692cd7d53e532d303c4525ee4667c1ecea3026

One of the problems arising when tweaking or adjusting the quantizer
tables is that there are a lot of look up tables that depend on the QINDEX.
Any adjustment to the link between QINDEX and real quantizer therefore tends
to break aspects of for example the rate control.

In this check in I have replaced several of the look up tables with functions that
approximate the same results as the old Q luts but use a formulaic approach
based on real Q values rather than QIndex. This should hopefully make it easier
to experiment with changes to the Q tables without always having to go through
and hand optimize a set of look up tables. Once things stabilize we may choose
to re-instate luts for the sake of performance.

Patch 2:
    Addressed Ronald's comments.
    vp8_init_me_luts() Added so luts only initialized once.

Change-Id: Ic80db2212d2fd01e08e8cb5c7dca1fda1102be57

Corrected dc lookup table to maintain ac/dc balance
close to what it was previously.

Firstpass not being passed the adjusted Q index for
the extended range.

Change-Id: Ic0200dabda445fea03bf81067999cb2670e99b77

Clean up of vp8_kfread_modes().
Remove unnecessary indentation and enforce line length.

Change-Id: I0864d1aff55368126db01bb23efa815786b5245d

Fix decoder segmentation bug for temporal coding where the segment map
was first initialized on a key frame.

in vp8_kfread_modes() after reading the segment id it must be written to
the  pbi->segmentation_map[] for use in temporal coding on subsequent frames.

Change-Id: I1489305efc376564e734a216f69c2844646ee3d3

Block the selection of 4x4 modes in key frames if 8x8 is selected.

Change-Id: Ie5729ec22a999d9a1996f020bd4b941e29514992

The buffer level was able to increase indefinitely rather than
being clipped to the maximum buffer size specified by the user.

This change checks the buffrer level and prevents it from
going beyond the upper limit of the buffer.

Change-Id: Ifff55f79d3c018e4d3d77e554b11ada543cc1654

This commit has a few minor fixes to the 8x8 trellis quant, so to
make it work regardless if extend_qrange is enabled or not. It also
borrowed adaptive RDMULT constants from 4x4 trellis that was missed
in the 8x8 trellis quant.

Change-Id: I60d7769071f102c699b5084597e62bca87a1f759

Explicit inclusion of limits.h to satisfy unix build for definition of INT_MAX.
Some commented out code removed.

Change-Id: I5b5980dfaa9b4d2d12bfd729cfd35bd982106908

Removal of CONFIGURE_SEGMENTATION ifdefs.

Removal of legacy support code fo the old coding mechanism.

Use local reference "xd" for MACROBLOCKD structure in
encode_frame_to_data_rate()

Moved call to choose_segmap_coding_method() out of encode
loop as the cost of segmentation is not properly accounted
in the loop anyway. If this is desirable in the future it
can be moved back. The use of this function to do all the
analysis and set the probabilities also removes the need
to track segment useage in threading code.

Change-Id: I85bc8fd63440e7176c73d26cb742698f9b70cade