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3.2% gains on std/hd, 1.0% gains on hd.

Change-Id: I481d5df23d8a4fc650a5bcba956554490b2bd200

This experimental change reorders the search so
that all possible references that match the target
reference frame are tested first and these in order
of distance from the current block. These will usually
be the highest scoring candidates.

If we do not find enough good candidates this way
we try non matching cases. These will usually be lower
scoring candidates.

The change in order together with breakouts when
we have found enough candidates should reduce
the computational cost and especially reduce the number
of sort operations.

Quality Results:
Std Hd +0.228%, Hd +0.074%, YT +0.046%, derf +0.137%

This effect is probably due to the fact that more distant
weak candidates are now less likely to get "promoted" over
near candidates even if they are repeated.

Change-Id: Iec37e77d88a48ad0ee1f315b14327a95d63f81f6

Part of NEW_MVREF experiment.
Added update-able probabilities.

Change-Id: I5a4fcf4aaed1d0d1dac980f69d535639a3d59401

The 2-D inverse transform X = M1*Z*Transposed_M2 was calculated
in 2 steps from left to right:
1. Vertical transform: Y = M1*Z
2. Horizontal transform: X= Y*Transposed_M2
In SIMD, a transpose is needed in vertical transform.

Here, switched the calculation order to do it from right to left.
In this way, we could eliminate that transpose by writing the
intermediate results out to their transposed positions.

Change-Id: I34dfe5eb01292f6e363712420d99475e2e81e12c

These filters will not work with VP9.

Change-Id: Ic26c77961084fcea6bfa97f4cd95afdea2282e85

Adds an experiment to derive the previous context of a coefficient
not just from the previous coefficient in the scan order but from a
combination of several neighboring coefficients previously encountered
in scan order.  A precomputed table of neighbors for each location
for each scan type and block size is used. Currently 5 neighbors are
used.

Results are about 0.2% positive using a strategy where the max coef
magnitude from the 5 neigbors is used to derive the context.

Change-Id: Ie708b54d8e1898af742846ce2d1e2b0d89fd4ad5

For coefficients, use int16_t (instead of short); for pixel values in
16-bit intermediates, use uint16_t (instead of unsigned short); for all
others, use uint8_t (instead of unsigned char).

Change-Id: I3619cd9abf106c3742eccc2e2f5e89a62774f7da

Fixed the warning: the size of array ‘intermediate_buffer’ can’t
be evaluated [-Wvla].

Change-Id: Ibcffd6969bd71cee0c10f7cf18960e58cd0bd915

This matches the names of tables for all other transform sizes.

Change-Id: Ia7681b7f8d34c97c27b0eb0e34d490cd0f8d02c6

Change-Id: I9548891d7b8ff672a31579bcdce74e4cea529883

Prefer the standard fixed-size integer typedefs.

Change-Id: Iad75582350669e49a8da3b7facb9c259e9514a5b

not defined in msvc

Change-Id: I8fe8462a0c2f636d8b43c0243832ca67578f3665

Modifies the scanning pattern and uses a floating point 16x16
dct implementation for now to handle scaling better.
Also experiments are in progress with 2/6 and 9/7 wavelets.

Results have improved to within ~0.25% of 32x32 dct for std-hd
and about 0.03% for derf. This difference can probably be bridged by
re-optimizing the entropy stats for these transforms. Currently
the stats used are common between 32x32 dct and dwt/dct.

Experiments are in progress with various scan pattern - wavelet
combinations.

Ideally the subbands should be tokenized separately, and an
experiment will be condcuted next on that.

Change-Id: Ia9cbfc2d63cb7a47e562b2cd9341caf962bcc110

Gives 0.5-0.6% improvement on derf and stdhd, and 1.1% on hd. The
old tables basically derive from times that we had only 4x4 or
only 4x4 and 8x8 DCTs.

Note that some values are filled with 128, because e.g. ADST ever
only occurs as Y-with-DC, as does 32x32; 16x16 ever only occurs
as Y-with-DC or as UV (as complement of 32x32 Y); and 8x8 Y2 ever
only has 4 coefficients max. If preferred, I can add values of
other tables in their place (e.g. use 4x4 2nd order high-frequency
probabilities for 8x8 2nd order), so that they make at least some
sense if we ever implement a larger 2nd order transform for the
8x8 DCT (etc.), please let me know

Change-Id: I917db356f2aff8865f528eb873c56ef43aa5ce22

Add a function clip_pixel() to clip a pixel value to the [0,255] range
of allowed values, and use this where-ever appropriate (e.g. prediction,
reconstruction). Likewise, consistently use the recently added function
clip_prob(), which calculates a binary probability in the [1,255] range.
If possible, try to use get_prob() or its sister get_binary_prob() to
calculate binary probabilities, for consistency.

Since in some places, this means that binary probability calculations
are changed (we use {255,256}*count0/(total) in a range of places,
and all of these are now changed to use 256*count0+(total>>1)/total),
this changes the encoding result, so this patch warrants some extensive
testing.

Change-Id: Ibeeff8d886496839b8e0c0ace9ccc552351f7628

Change-Id: I0c1be01aae933243311ad321b6c456adaec1a0f5

Some further changes and refactoring of mv
reference code and selection of center point for
searches. Mainly relates to not passing so many
different local copies of things around.

Some place holder comments.

Change-Id: I309f10ffe9a9cde7663e7eae19eb594371c8d055

This commit changed the ENTROPY_CONTEXT conversion between MBs that
have different transform sizes.

In additioin, this commit also did a number of cleanup/bug fix:
1. removed duplicate function vp9_fix_contexts() and changed to use
vp8_reset_mb_token_contexts() for both encoder and decoder
2. fixed a bug in stuff_mb_16x16 where wrong context was used for
the UV.
3. changed reset all context to 0 if a MB is skipped to simplify the
logic.

Change-Id: I7bc57a5fb6dbf1f85eac1543daaeb3a61633275c

Use these, instead of the 4/5-dimensional arrays, to hold statistics,
counts, accumulations and probabilities for coefficient tokens. This
commit also re-allows ENTROPY_STATS to compile.

Change-Id: If441ffac936f52a3af91d8f2922ea8a0ceabdaa5

Change-Id: I1eb7433061a6c529471026e0ebdc6467942062eb

This adds Debargha's DCT/DWT hybrid and a regular 32x32 DCT, and adds
code all over the place to wrap that in the bitstream/encoder/decoder/RD.

Some implementation notes (these probably need careful review):
- token range is extended by 1 bit, since the value range out of this
  transform is [-16384,16383].
- the coefficients coming out of the FDCT are manually scaled back by
  1 bit, or else they won't fit in int16_t (they are 17 bits). Because
  of this, the RD error scoring does not right-shift the MSE score by
  two (unlike for 4x4/8x8/16x16).
- to compensate for this loss in precision, the quantizer is halved
  also. This is currently a little hacky.
- FDCT and IDCT is double-only right now. Needs a fixed-point impl.
- There are no default probabilities for the 32x32 transform yet; I'm
  simply using the 16x16 luma ones. A future commit will add newly
  generated probabilities for all transforms.
- No ADST version. I don't think we'll add one for this level; if an
  ADST is desired, transform-size selection can scale back to 16x16
  or lower, and use an ADST at that level.

Additional notes specific to Debargha's DWT/DCT hybrid:
- coefficient scale is different for the top/left 16x16 (DCT-over-DWT)
  block than for the rest (DWT pixel differences) of the block. Therefore,
  RD error scoring isn't easily scalable between coefficient and pixel
  domain. Thus, unfortunately, we need to compute the RD distortion in
  the pixel domain until we figure out how to scale these appropriately.

Change-Id: I00386f20f35d7fabb19aba94c8162f8aee64ef2b

Change-Id: I178352813d2b8702d081caf405de9dbad9af2cc3

Only declare the functions in vpx_scale RTCD and include the relevant
header.

Remove unused files and functions in vpx_scale to avoid wasting time
renaming. vpx_scale/win32/scaleopt.c contains functions which have not
been called in a long time but are potentially optimized.

The 'vp8' functions have not been renamed yet. That is for after the
cleanup.

Change-Id: I2c325a101d60fa9d27e7dfcd5b52a864b4a1e09c

Change-Id: I9f0ae635fb9a95c4aa1529c177ccb07e2b76970b

This patch reduces the cpu cost of the MV ref
search by only allowing insert for candidates
that would be in the current top 4.

This could alter the outcome and slightly favors
near candidates which are tested first but also
limits the worst case loop count to 4 and means in
many cases it will drop out and not happen.

Change-Id: Idd795a825f9fd681f30f4fcd550c34c38939e113

Only declare the functions in vpx_scale RTCD and include the relevant
header.

Remove unused files and functions in vpx_scale to avoid wasting time
renaming. vpx_scale/win32/scaleopt.c contains functions which have not
been called in a long time but are potentially optimized.

The 'vp8' functions have not been renamed yet. That is for after the
cleanup.

Change-Id: I2c325a101d60fa9d27e7dfcd5b52a864b4a1e09c

Change-Id: I9f0ae635fb9a95c4aa1529c177ccb07e2b76970b

Change-Id: I467bf0fdf3b35326bcce58d5459e6d2dbfd6c5e5

Adds support for compound inter-intra prediction with superblocks.
Also, fixes a bug that disabled intra modes for superblocks.

Change-Id: I4d711317e1bc19df8c2f32dc645429f7fff31036

Allows switchbale filters to be used without mismatch when the
superblock experiment is on.

Also removes a spurious clamping code in decodemv.c which causes
rare encode/decode mismatches.

Change-Id: I809d9ee0b2859552b613500b539a615515b863ae

Change-Id: Ib5106d4772450f8026f823dd743f162ab833b1d6

Change-Id: I2c252f3ddcc99e96c1f5d3dab8bcb25a2a3637ea

Change-Id: Ie34820c1b6eaba9cf9316415a46f48af79c41646

clears up some warnings

Change-Id: I9899637497c6ad7519f098e055ab98580ae6d688

Change-Id: I20c426e91ee49666db42e20eb074095ab6b8ec5d

Change-Id: Ieefd76e164ca4aa87597da0412977614ddfbacb7

This patch allows use of 8x8 and 4x4 ADST correctly for Intra
16x16 modes and Intra 8x8 modes when the block size selected
is smaller than the prediction mode. Also includes some cleanups
and refactoring.

Rebase.

Change-Id: Ie3257bdf07bdb9c6e9476915e3a80183c8fa005a

Given the way mode_context is updated, the benefit of an additional
default is not signficant.

Change-Id: I67489453e8781340b18e26a1cc2f04e9221004a2

Change-Id: Ia1cce221f8511561b9cbd8edb7726fbc286ff243

and some miscellaneous invoke left overs

Change-Id: I63191b1bfd3bea4ce30cceaeb686ec850570fc43