After porting tile coding from VP9 to VP10, some performance
degradation was seen because of the difference between VP9 and
Vp10 baseline. This patch disabled some features in VP10 while
tile coding is turned on. Also, an encoder control API was added
back for this use case.
Change-Id: I8f736db8388408a8cc35320a2f80abb02906571c
If configured with --enable-ext-tile, the codec uses an alternative
tile coding syntax in the bitstream. Changes include::
- The maximum number of tile rows and columns is extended to 1024
each.
- The minimum tile width/height is 64 pixels (1 superblock).
- A tile copy mode is added where a tile directly reuse the coded
data of a previous tile
- The meaning of the tile-columns and tile-rows codec parameters are
overloaded to mean tile-width and tile-height in units of 64
pixels.
- All tiles should now be independent, including rows within the
same columns, so large scale parallel, or independent decoding is
possible.
- vpxdec also gained the options to decode only a particular tile,
tile row, or tile column.
Changes without --enable-ext-tile:
- All tiles should now be independent, including rows within the
same columns, so large scale parallel, or independent decoding is
possible.
- vpxenc default tile configuration changed to use 1 tile column.
Change-Id: I0cd08ad550967ac18622dae5e98ad23d581cb33e
This commit separates the predicted motion vector from the nearestmv
motion vector in the coding process for both regular and sub8x8
block sizes.
Change-Id: I703490513b0194e6669ebf719352db015facb3e1
This has been ported under ext_partition_types because it is due
to be combined with the coding_unit_size experiment which is
already being ported under ext_partition
Change-Id: I47af869ae123ddf0aa99160dac644059d14266ee
Merge the functions that generate prediction by above/left predictors
for the encoder and the decoder.
Change-Id: I57e53a8f2eb8d3028c4ed0c9abdcbf00503f95a0
This allows sharing more code paths with the rest of the code an allows
for easier compatibility with the other experiments.
Change-Id: Id288b533805a4d0657ec2f17542f2e6ad23ebdb4
Rework the interface to allow codec store the reference motion
vector list information for coding process.
Change-Id: I47e26587f6c0808655e4626f316ec7614a7ad8ed
This commit re-designs the probability model for the syntax elements
of the dynamic motion vector referencing system.
Change-Id: Icfb8203c7e8f64e10e99f5890e25e6f6b15fe5d1
This commit enables the dynamic motion vector predictor for NEWMV
mode. It allows the codec to select the best motion vector predictor
in a rate-distortion optimization framework for motion vector
residual coding. The compression performance is improved:
lowres 0.14%
midres 0.27%
hdres 0.24%
Change-Id: I6a601c74eb6cb0b71a613336d40363359f2edecd
This patch added two features to improve entropy coding efficiency
for coefficient tokens.
1. Choose 1 of 4 default probability tables based on q-index for
key-frames.
It is ported from nextgen branch:
https://chromium-review.googlesource.com/#/c/280586/
2. Do backward update after each superblock (64X64) row using
subframe token counts.
Coding gain: 0.1% on lowres; 0.42% on midres; 0.36% on hdres.
Much larger gain for key-frames: 2.6%, 2.3%, 1.7%.
Design doc: go/huisu-entropy
Change-Id: Ia3b6a615636be09247d70e4c520405637561532b
Coding gain on screen_content is 12.2% (was 6.6%).
Some features such as frame-level color buffer, adaptive
entropy coding, are coming in future patches.
Change-Id: I2658cf5ec0cbb02cff685475759f3b68c9807697
This commit enables the 1-D transform to use Manhattan grid vertical
and horizontal scan order for transform coefficient entropy coding.
Enabled in inter prediction mode, the hybrid 1D/2D transform coding
scheme outperforms the 2D-DCT based coding system used in VP9 by
lowres_all 1.7%
hdres_all 1.4%
As one coding option, in addition to the existing 17 other transform
types in ext-tx experiment, the 1D/2D hybrid transform improves
the coding gains:
lowres_all 2.2% -> 3.0%
Change-Id: I9cefa9d9e38224546d0afd67feecd9f8d4a16ab0
For left side obmc, the input of the mask function is corrected as
the column coordinate.
Also, minor fixes for a compiler warning.
Change-Id: Ia981ef443d5b0285a93d73e5c7ab83f8c3a23464
Make the RANS implementation operate on cumulative distribution
functions rather than individual probability distribution functions.
CDFs have shown themselves more flexible to work with.
Reduces decoding memory usage from scaling O(num_distributions *
symbol_resolution) to O(num_distributions).
No bitstream change. This is an purely implementation change.
Change-Id: I4e18d3a0a3d37a36a61487c3d778f9d088b0b374
Includes various cosmetic changes and refactoring including
naming the sharp filters differently (since they are no longer
8-tap).
Change-Id: Ida5a19ca0daa9f6a64a6734394c685b2a4a2564a
This commit unifies the encoder and decoder border extension and
motion compensated prediction process. Remove the decoder specific
flow to simplify the development flow.
Change-Id: I9c43bbe6d7c017e6da2db6a62c5bf3d0af7ccfce
The interintra experiment, which combines an inter prediction and an
inter prediction have been ported from the nextgen branch. The
experiment is merged into ext_inter, so there is no separate configure
option to enable it.
Change-Id: I0cc20cefd29e9b77ab7bbbb709abc11512320325
This commit converts the scalar motion vector probability model
into vector format for later precise estimate.
Change-Id: I7008d047ecc1b9577aa8442b4db2df312be869dc
In this experiment, an obmc inter prediction mode is enabled for
>= 8X8 inter blocks. When the obmc flag is on, the regular block-
based motion compensation will be refined by using predictors of
the above and left blocks.
Fixed some compatibility issues with vp9_highbitdepth, supertx,
ref_mv, and ext_interp.
Coding gain (%) on derflr/hevcmr/hevchd
OBMC:
1.047/1.022/0.708
OBMC + SUPERTX:
1.652/1.616/1.137
SUPERTX:
0.862/0.779/0.630
Change-Id: I5d8d3c4729c6d3ccb03ec7034563107893103b7f
Adds a wiener filter based restoration scheme in loop which can
be optionally selected instead of the bilateral filter.
The LMMSE filter generated per frame is a separable symmetric 7
tap filter. Three parameters for each of horizontal and vertical
filters are transmitted in the bitstream. The fourth parameter
is obtained assuming the sum is normalized to 1.
Also integerizes the bilateral filters, along with other
refactoring necessary in order to support the new switchable
restoration type framework.
derflr: -0.75% BDRATE
[A lot of videos still prefer bilateral, however since many frames
now use the simpler separable filter, the decoding speed is
much better].
Further experiments to follow, related to replacing the bilateral.
Change-Id: I6b1879983d50aab7ec5647340b6aef6b22299636
Setting FIXED_TX_TYPE as 1 makes the encoder skip tx_type search,
about twice as fast.
This speed feature is off by defualt; we can turn it on when we
want to quickly test new ideas.
Change-Id: Ieab5807d17fcd54fce3e8ae2f59a18b42eb79408
