vp8_encode_inter_macroblock() is called in both pick_mb_modes() as
well as encode_sb(), thus the number of macroblocks in the counter
were twice as big as actual numbers. This doesn't affect output.

Change-Id: I6de8a996ee44d2f7f2080d8d2177dd7bc6207c93

This allows CONFIG_SUPERBLOCKS experiment to almost compile succesfully,
except for the missing pick_sb_modes() function.

Change-Id: Ib2322f2aacdc371e8066f2eb4a8d761c40490b4d

Also use the 8x8 transform in the RD loop.

Change-Id: If1a25aa15d3f64e05c9a31875e309d8cd5bc812d

Change-Id: Ibfecf1fb0fcf51fb349746fec015b1a3e44a4530

Change-Id: Iff5ccf2400bcb7b78c7b70f289ea65c982efddd5

Change-Id: I6dd27a0ea661e6f10a55d7841021b66ae4fc72ae

This commit adds lossless compression capability to the experimental
branch. The lossless experiment can be enabled using --enable-lossless
in configure. When the experiment is enabled, the encoder will use
lossless compression mode by command line option --lossless, and the
decoder automatically recognizes a losslessly encoded clip and decodes
accordingly.

To achieve the lossless coding, this commit has changed the following:
    1. To encode at lossless mode, encoder forces the use of unit
quantizer, i.e, Q 0, where effective quantization is 1. Encoder also
disables the usage of 8x8 transform and allows only 4x4 transform;
    2. At Q 0, the first order 4x4  DCT/IDCT have been switched over
to a pair of forward and inverse Walsh-Hadamard Transform
(http://goo.gl/EIsfy),  with proper scaling applied to match the range
of the original 4x4 DCT/IDCT pair;
    3. At Q 0, the second order remains to use the previous
walsh-hadamard transform pair. However, to maintain the reversibility
in second order transform at Q 0, scaling down is applied to first
order DC coefficients prior to forward transform, and scaling up is
applied to the second order output prior to quantization. Symmetric
upscaling and downscaling are added around inverse second order
transform;
    4. At lossless mode, encoder also disables a number of minor
features to ensure no loss is introduced, these features includes:
        a. Trellis quantization optimization
        b. Loop filtering
        c. Aggressive zero-binning, rounding and zero-bin boosting
        d. Mode based zero-bin boosting

Lossless coding test was performed on all clips within the derf set,
to verify that the commit has achieved lossless compression for all
clips. The average compression ratio is around 2.57 to 1.
(http://goo.gl/dEShs)

Change-Id: Ia3aba7dd09df40dd590f93b9aba134defbc64e34

Added the ability to optionally filter the prediction data
when inter modes are selected (excludes SPLITMV, for now).

The mode selection loop considers both the filtered and
non-filtered prediction data when choosing mode. The filter
can be turned on/off at the frame-level, or signaled for
each MB.

Change-Id: I1b783c71d95a361ab36c761b07e8a6b06bc36822

Incorporates mv_ref, mbsplit and second_mv into the adaptive
entropy framework. The mv_ref framework has been modified from
before.

Adds some clean-ups and fixes.

Results with the adaptive entropy experiment are currently up by
+1.93% on derf; +2.33% std-hd and +1.87% yt-hd.

Fixed a nasty intermittent bug.

Change-Id: I4b1ac9f9483b48432597595195bfec05f31d1e39

Change-Id: I883b4f63559c1cf66a25016e946b1b1ae98a20da

This patch incorporates adaptive entropy coding of coefficient tokens,
and mode/mv information based on distributions encountered in a frame.
Specifically, there is an initial forward update to the probabilities
in the bitstream as before for coding the symbols in the frame, however
at the end of decoding each frame, the forward update to the
probabilities is reverted and instead the probabilities are updated
towards the actual distributions encountered within the frame.
The amount of update is weighted by the number of hits within each
context.

Results on derf/hd/std-hd are all up by 1.6%.

On derf, the most of the gains come from coefficients, however for the
hd and std-hd sets, the most of the gains come from the mode/mv
information updates.

Change-Id: I708c0e11fdacafee04940fe7ae159ba6844005fd

This commit is to remove two arrays, which contain the probabilities
of how likely each probability in coef_probs table is updated. The
commit changed to use a fixed number "252".

Surprisedly, the overall impact on quality is close to zero, which
basically says the two big static arrays are not helpful at all.
derf: -0.016%, -0.020%
std-hd: 0.000%, -0.013%
yt: -0.022%, +0.007%
yt-hd: -0.038%, +0.034%

Change-Id: Ifee94d28a37dcab4f1d2b994bd5b07575be42b72

This commit added the ability to accumulate the coef stats across
different encodings using an intermediate binary stats files. The
accumulation happens only the binary stats file exists in current
directory. The encoder needs to be built with "ENTROPY_STATS" to
allow the output. The commit also fixed a few formating issues in
output stats file.

Change-Id: Ib1a41180aa554845cf51e4421a230b128a3a82b4

Changes to calculation of  sr_coded_error to include 0,0 case.

Experimental use of sr_coded_error in calculating correction factor
for estimating the allowable Q range.

Reinstated some code needed for calculating section_intra_rating.

Add flash detection in calculation of KF boost

Increased tolerance in testing candidate key frames (needed with
longer motion search as this tends to slightly increase inter %.

Zbin changes for 8x8.

Other minor adjustments, refactoring and bug fixes.

Reinstated some motion break out clauses in boost loop
as their removal hurt a few 50fps  clips badly in the std set.
It may be possible to remove them again later if a better way
can be found of preventing overly long gf intervals.

Change-Id: Iee686d0c31072828bb1ccd2bc63f5f1c7c548ea2

Changes to the equations for kf and gf minQ and to
the boost calculations for kg and gf

Change-Id: I312031c910e6a575334f49075c32f49a8dfff239

Variables m & mi were being dereferenced when they might
hold invalid values.

The fix is simply to move these dereferences to after the
point at which mb_row and mb_col are tested for validity.

Change-Id: Ib16561efa9792dc469759936189ea379d374ad20

This fix addresses some problems with very complex clips like
handling of flashes on clips like crew (which was made worse
by an earlier patch (derf and std-hd)).

Most clips a small effect but some between 1 & 2%

Derf +0.039, +0.211%
YT +0.042, +0.083%

Change-Id: I65fc7c13afc31482040068544dd65b8808f5cb4a

Removed the local scaling factor est_max_qcorrection_factor
and related code to simplify estimateq calculation (little effect
anyway)

Cap range of total correction factor.

Slight change to break out case to turn off arf.

Change-Id: I748187737ba93cfadf016f3dfdf8d2741934067f

One more compiling issue, only happened in Visual C under a specific
combination of experiments.

Change-Id: Iba0775dc0ea7342b556348a9cdf60a05a59e0241

the commit fixed a number of compiling issues when some epxeriments
are turned on at the same time.

Change-Id: Idb15b215e2d2a7d25f2707f99ef55a34e7301ce7

The commit changed how baseline 8x8 coefficient probabilities are
initialized, to be consistent with the initialization of baseline
4x4 coefficient probabilities.

The commit does not have any effect on compression.

Change-Id: Ifb3902b5dc0b0c2e6dc3aa5d4a6589d528e58355

Remove dependency on amount and speed of motion as this
may not behave well across different image sizes.

Tweak impact of % inter.

Add in experimental adjustment based on relative quality of an
older second reference frame.

Cap range of decay values allowed.

Some small + effect on derf but -ve on yt & hd at this stage.

Change-Id: I390d6f6ebe67a2eb0b834980d0d4650124980d3e

I now see I didn't write a very long description, so let's do it
here then. We took a pretty big quality hit (0.1-0.2%) from my
recent fix of the inversion of arguments to vp8_cost_bit() in the
RD reference frame costing. I looked into it and basically the
costing prevented us from switching reference frames. This is of
course silly, since each frame codes its own prob_intra_coded, so
using last frame cost indications as a limiting factor can never
be right.

Here, I've rewritten that code to estimate costings based partially
on statistics from progress on current frame encoding. Overall,
this gives us a ~0.2%-0.3% improvement over what we had previously
before my argument-inversion-fix, and thus about ~0.4% over current
git (on derf-set), and a little more (0.5-1.0%) on HD/STD-HD/YT.

Change-Id: I79ebd4ccec4d6edbf0e152d9590d103ba2747775

base the static image test off a measure of 0,0 motion
instead of the decay accumulator value.

Change "transition to still detection" to compare the
decay rate from successive frames.

Minor tweak to the arf extra boost given based on the
number of frames affected.

Removed unused variable mod_err_per_mb_accumulator.

Change-Id: Idd8360083ad409e45f133ce97dd2488259003e64

Adds 6 directional intra predictiom modes for 16x16 and 8x8 blocks.

Change-Id: I25eccc0836f28d8d74922e4e9231568a648b47d1

The commit added an integer version of 8x8 forward DCT, based on the
orginal forward DCT from VP6. The constants, roundings, and shifts
were adjusted to improve the accuracy. The latest patch has a very
similar accuracy in term of round trip error against the floating
point version.

It should be noted here that the purpose of the patch is to help
encoding speed and facilitate all other experiments. There will be
futher review in combination with inverse DCT before finalization.

configure with "--enable--int_8x8fdct" to use the integer version

Change-Id: I5a4f80507429f0e07cf02a13768ec81cbfddc5bc

Some marginal impact due to the fact that it makes use of
arf more likely / stable even in hard sections.

Change-Id: Ic72fda0f63eefc9433914b5d9cd374d515810129

Removed unused function.

Added tentative code to take error score of an older frame
into account when calculating Q range. However, for now
it is disabled pending merging other changes and testing.

Change-Id: Ie89955e70319dac31b79e3b833e3352712a061ec

Remove testing of whether we estimate that it will be possible
to code an arf at a lower Q than the ambient Q.  This adds quite
a bit of extra code and complexity for marginal gain.

Factored out some code relating to ARNR selection to a separate
function as this is likely to be changed / simplified soon.

Change-Id: Ia1cf060405637ef5bbf7018355437be21d12375f

Removed odd *100 >> 4 factor from boost calculations. Not all the
calculations exactly match what was there before so there may be
some minor impact on results.

Some other minor tidying up in regard to coding conventions.

The specific values of factors and thresholds will likely change as
part of subsequent patches.

Change-Id: Id976321484ac02ba50294cf54fafbc17dda85686

These frames can force reference frame (arf), mode (zeromv) and skip,
which means that if we use compound prediction (i.e. arf+last), we
might use a blend of a perfect (arf) and an imperfect (last) predictor,
leading to semi-garbage display and thus a huge drop in SSIM/PSNR (up
to 10dB for some frames I analyzed).

Gives a +0.2% gain on YT.

Change-Id: If1f2b7899ad165684af3808fd379295e82558cbb

This is the first patch in a series of changes to the first
pass code. (Broken down for ease of testing/merging/review).

This patch introduces a new stats element "sr_coded_error".
This is the coded error recorded vs the second reference
frame (which is updated such that it lags by at least one frame).
No use is made of the new structure in this change so this patch
should have no material effect.

Removed some ifdefs and deprecated code (#if NEW_BOOST).
Removed twopass.gf_decay_rate (not used any more)

Change-Id: I1be672a73017f7c13fd50fb4f99236aa2ed30916

This commit changed the forward and the inverse 4x4 Walsh Hadamard
transform to a new pair, where the inverse transform can pefectly
reconstuct the input to forward transform. It also does so without
changing the input and output value range. Even more, it does not
change the complexity of the transforms.

While it was not expected to improve the results of our current test,
it does improve std-hd set by 0.2% on all metrics. No change on derf.

Change-Id: Ie4f23ddd3a0f3c5fbe97fb58399f860031f99337

Also includes some clean ups and refactoring.

Rebased.

Change-Id: I268c97fe325b4881103fe19f41ae818569e7ccf7

1. block types
There are only three types of blocks for 8x8 transformed MBs, i.e. Y
block with DC does not exist for 8x8 transformed MBs as all MB using
8x8 transform have 2nd order haar transform. This commit introduced
a new macro BLOCK_TYPES_8X8 to reflect such fact.

2. context counters
This commit also fixed the mixed of context_counters between 4x4 and
8x8 transformed MBs. The mixed use of the counters leads me to think
the existing the context probabilities were not properly generated
from 8x8 transformed MBs.

3. redundant collecting in recoding
The commit also corrected the code that accumulates entropy stats by
making sure stats only collected for final packing, not during the
recode loop

Change-Id: I029f09f8f60bd0c3240cc392ff5c6d05435e322c

This patch expands the set of prev contexts used for video coding
from 3 to 4.

There is a small improvement of the order of 0.08% for derf and
0.15% on the HD set. The tests were rerun after the various merges
last week. There are two columns in each test - the first are the
results with the mbskip change, and the second with expanded contexts
added on top of that.

Derf:
http://www.corp.google.com/~debargha/vp8_results/explibvpx_newentropy_expcontext.html

HD:
http://www.corp.google.com/~debargha/vp8_results/explibvpx_hd_newentropy_expcontext.html

Rebased.

Broke up 80 char lines.

Change-Id: I82d2e72d054e530cbf5ce9aa0e6d85c582965675

Change-Id: I9f1686249ac812f7b9b872eabe3970d1dfb25e56

Change-Id: I87291fb40c745f34c36b067f47abdf69774a812f

Removes a set of spurious declarations that were inadvertently checked
in.

Change-Id: I2f80b6b66d2ec9ea667c810eaf1a6e7d52478c67

The ARNR filter uses a motion compensated temporal filter,
but the motion estimation implementation accounts for the
cost of the mv in its decision making process. The ARNR
filter uses a dummy cost table initialized to 0 as a way
to ignore the mv costs (which are irrelevant to the filter).

This CL modifies the ARNR filter implementation to so that
the mv costing is ignored without the requirement for
dummy tables.

Change-Id: I0dd9620c3b70682f938b2a70912c11d4d7c9284c