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The dc_pred values stored in the CfL context are in Q8.7 (Worst case
division will be of 1/128).

Results on Subset1 (compared to f9684d222 with CfL enabled)

  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0118 | -0.0181 | -0.0109 |   0.0086 | 0.0086 |  0.0196 |     0.0018

Change-Id: I0701e04fb76f03eff12ed01fd5fda675fbb15e32

This change does not impact the bitstream as no loss is incured by using
a fixed point value for the transform size average.

For low bit depth, the transform size average is stored using Q8.10
fixed point format. Worst case, smallest fraction is 1/1024.

Results on Subset1 (Compared to 366b74 with CfL)

  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0000 |  0.0000 |  0.0000 |   0.0000 | 0.0000 |  0.0000 |     0.0000

Change-Id: Ia5b046b92a0e4c40e413b16af3394bdc0a8c8cd9

When computing alpha, multiple averages are computed, one for each
transform block. The CfL prediction now uses the transform block average
instead of partition block average.

This allows the decoder to build the CfL prediction by using only the
collocated reconstructed luma values for the current transform size and
not the entire partition.

Results on Subset 1 (Compared to 0e81b97c with CfL)

  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0180 |  0.2627 |  0.2274 |   0.0233 | 0.0301 |  0.0312 |     0.1506

A small regression is expected, this change was made to simplify
hardware implementations.

Change-Id: Ib2ce2a3053b85300c5c62ef0e3270af489568a38

Adjust row and col offset for sub8x8 blocks to allow the CfL prediction
to use all available reconstructed luma pixels.

Results on Subset 1 (Compared to b03c2f44 with CfL)

   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.1355 | -0.8517 | -0.4481 |  -0.0579 | -0.0237 | -0.0203 |    -0.2765

Change-Id: Ia91f0a078f0ff4f28bb2d272b096f579e0d04dac

The function cfl_compute_parameters is added and contains the logic
related to building the CfL context parameters. As such, many cfl
functions can now be encapsulated inside of cfl.c and not exposed to the
rest of AV1.

This also allows for supplemental asserts that validate that the CfL
context is properly built.

Results on Subset1 (compared to 9c6f8547 with CfL)

  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0000 |  0.0000 |  0.0000 |   0.0000 | 0.0000 |  0.0000 |     0.0000

Change-Id: I6d14a426416b3af5491bdc145db7281b5e988cae

Results on Subset 1 (Compared to a0f8c145 with CfL)

  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0677 | -0.3359 | -0.2115 |   0.0529 | 0.0735 |  0.0495 |    -0.0907

Change-Id: Ib61ff862e8cfbdf0c693a4eba5f2712a6e9ab819
Signed-off-by: David Michael Barr <b@rr-dav.id.au>

In 84a44dbe, there was a transcription error in the table.
Point { 5, 3 } was duplicated and { 5, 0 } was missing.

While we are here, updated the order and CDF from subset3.

Results on subset1 (compared to cab68ae6 with CfL)
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
 0.0416 | -0.2732 | -0.3848 |   0.0385 | 0.0309 |  0.0230 |    -0.0178

Change-Id: I3244245792c5ab99b4149ae5f8a2439d4214ed69
Signed-off-by: David Michael Barr <b@rr-dav.id.au>

Extract the compution of the luma reconstructed average out of cfl_load
and into cfl_compute_average. The reconstructed luma average is stored
in the CFL_CONTEXT to avoid computing it for each transform block and
for each plane.

Results on subset1 (compared to 803bea26 with CfL)
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0474 | -0.1486 | -0.2931 |  -0.0358 | -0.0397 | -0.0127 |    -0.1162

Change-Id: I9e34af0fe5961ce8dbe70cb80aea2a16221d0d92

plane_bsize is now computed properly. This also includes support for the
special case of blocks < 4X4

Results on subset1 (compared to 8e689e4b with CfL)
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0218 | -0.2328 | -0.2555 |  -0.0230 | -0.0379 | -0.0723 |    -0.1205

Change-Id: I6ec87d818d8df6a40ecf3bb1b86954e59c952930

This change does not impact the bitstream
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0000 |  0.0000 |  0.0000 |   0.0000 | 0.0000 |  0.0000 |     0.0000

Change-Id: I6e131e91bad5efa345ed2542ae970eb6122eff51

Separate the codes into a table of distinct values
and an index into that table.
Pull the SSE calculation of the RDO loop and avoid
repeating for the same alpha values.

Change-Id: I8c4bd7eab6f8000e6aca9687d9190abc3e270c37
Signed-off-by: David Michael Barr <b@rr-dav.id.au>

Encapsulates the logic to update the rate of each CfL codeword.
The if statements are removed from the loop and the arrays are
stored in CFL_CTX instead of being declared every time.

Change-Id: I0cb208b14e6c6a888210dd33c5e8fe8d74dd87f4

Move cfl_idx_to_alpha in the header to facilitate inlining.
Remove the forward MB_MODE_INFO forward declaration

Change-Id: Id33fb0228d88b6285252843e2345a0d3ae875cd2

The prediction block level DC_PRED is stored and computed as double
instead of int.

Change-Id: I22766c102a7b62d4b5e7621438185808cc0ea8f4

Since the size used with cfl_load can either be based on the transform
block size and the prediction block size, width and height are used as
parameters instead of TX_SIZE.

This resolves a problem where cfl_compute_alpha_ind was reading
uninitialized memory.

Change-Id: I187dbdd5b2e8bd85e82bb77eb74859bee2cd3f1e

Writes and reads alpha to and from the bitstream.

A special case is needed on the encoder side to handle prediction block
skips. Since whether or not a prediction block is skipped during CfL, a
rollback is required if the block was skipped and the alpha index was
not zero. The advantage of this is that no signaling is required when
the prediction block is skipped as it is assumed tha the alpha index is
zero.

A encode facade is added to the intra prediction facade as CfL requires
special encoder side operations.

Change-Id: Ic3b11d0fdbd51389d862112eb09d8785127a6b06

Loads the stored reconstructed luma pixels for each trasnform block
inside a prediction block. Supports 4:4:4 and 4:2:0 chroma subsampling
modes.

The CFL_CTX struct is now in cfl.h with appropriate forward declarations

Change-Id: I44c117899414a10a8318d14ecaed402f803de97d

Stores the reconstructed luma pixels for each transform block inside a
prediction block. Rectangular transform blocks are supported.

As for RDO, after all the modes have been tested for luma, an extra
encoding is perform in order to store the reconstructed pixel values of
the best mode. These values are then used for RDO on the chromatic
planes.

Change-Id: I354d9827e32fd41065f1b2ce02832d943a6fa156

Change-Id: Ia97bc1c8b13f73b6dcdd40079535dba0b786c0c6

Adds the CfL experiment flag and computes a block-level DC_PRED that is
required by CfL in order to compute alpha_cb and alpha_cr.

The rate-distorsion impact of computing DC_PRED at the prediction block level
for chroma planes is rather small

Subset 1:
master_no_cdef@2017-04-18T20:37:05.712Z
  -> block_DCPRED_no_cdef@2017-04-18T20:38:07.381
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0712 |  0.0337 | -0.1692 |   0.0693 | 0.0814 |  0.0710 |    -0.0063
Note: CDEF was disabled because of problematic asserts.

Change-Id: I44d1cde8605b108366f4bd4cedbf5159dbbb5880

This minimize code differences between AOM master and nextgenv2

Change-Id: If144865bdf3ef0818e7aac11018b9e786444c550

Cherry-Picked the following commits:
0defd8f2 Changed "WebM" to "AOMedia" & "webm" to "aomedia"
54e66767 Replace "VPx" by "AVx"
5082a369 Change "Vpx" to "Avx"
7df44f17 Replace "Vp9" w/ "Av1"
967f722f Remove kVp9CodecId
828f30ce Change "Vp8" to "AOM"
030b5ffc AUTHORS regenerated
2524caee Add ref-mv experimental flag
016762be Change copyright notice to AOMedia form
81e55269 Replace vp9 w/ av1
9b94565b Add missing files
fa8ca9f2 Change "vp9" to "av1"
ec838b76  Convert "vp8" to "aom"
80edfa01 Change "VP9" to "AV1"
d1a11fb9 Change "vp8" to "aom"
7b582513 Point to WebM test data
dd1a5c8d Replace "VP8" with "AOM"
ff00fc0f Change "VPX" to "AOM"
01dee0bb Change "vp10" to "av1" in source code
cebe6f0c Convert "vpx" to "aom"
17b05679 rename vp10*.mk to av1_*.mk
fe5f8a8a rename files vp10_* to av1_*

Change-Id: I6fc3d18eb11fc171e46140c836ad5339cf6c9419

Change-Id: Iac1d97d84518649404e32b136b8fdd840723303c

Change-Id: I0d1e439b75eb749dd80a86474ac5f494478d0360

Change-Id: I5629de7726c65fb1463dff5fc5c1c82a3862a8f9

Change-Id: Ib8c9eb6263d6eba6b9d7b2e402b7e83a78c86be9

Right now only IVF format is supported which is enough for example code.
Other formats like y4m, webm, raw yuv will be supported later.

Change-Id: I34c6f20731c1851947587ca5c589d7856b675164

New API is supposed to be used from example code. Current implementation
only supports IVF containers (will be extended to Y4M).

Change-Id: Ib7da87237690b1a28297bdf03bc41c6836a84b7e

File type check inside ivf_read_frame() is not necessary (it is done
before this function get called).

Change-Id: Iede8feb358d25878b340473d85c3b01d701fc624

Change-Id: Ib8aafeee30d59521ee256dc1801e0db6b4b8a371

- Move IVF reading support into ivfdec.c and ivfdec.h
- Move IVF writing support into ivfenc.c and ivfenc.h
- Removed IVF writing code from the SVC example in favor of ivfenc.

Change-Id: I70adf6240d0320fdd232d8546ed573f0f68dd793

Values of MODE_UPDATE_PROB and VP9_COEF_UPDATE_PROB are equal, so replacing
them with one constant. Inlining appropriate arguments for functions:
  vp9_cond_prob_diff_update (encoder)
  vp9_diff_update_prob (decoder)

Change-Id: I1255a1cb477743b799b3bfbbcd8de6b32b067338

Change-Id: I5ae659c1bfb132428a7272d094b5287d144ec7c8

Change-Id: Idbb2ea80f764fa830fe2ddcfc54ef7fe232f05a8

Change-Id: Ic084c475844b24092a433ab88138cf58af3abbe4

Most of these were picked up by jenkins in the commit that changed
the vp8 namespace to vp9 in common/.

Change-Id: I5cbd56ffc753b92ef805133cda6acc1713a13878

Change-Id: Ic5a5f60e1ff9d9ccae4174160d36529466eeb509

Changes 'The VP8 project' to 'The WebM project', for consistency
with other webmproject.org repositories.

Fixes issue #97.

Change-Id: I37c13ed5fbdb9d334ceef71c6350e9febed9bbba

When the license headers were updated, they accidentally contained
trailing whitespace, so unfortunately we have to touch all the files
again.

Change-Id: I236c05fade06589e417179c0444cb39b09e4200d

Change-Id: Ieebea089095d9073b3a94932791099f614ce120c