Reduces the transform optons for INTRA as well as INTER when
transform size is 16x16 to not use any of the DSTs.
Thus, a total of 10 options are used for 16x16, while 4x4
and 8x8 still uses 17 options.
derflr/hevchd actually improves a little, while hevcmr drops
a little.
About 10% speed improvement.
Change-Id: I920a182231e052cdd622f8bb67085c16c572cb1e
Under the experiment of EXT_REFS: LAST2_FRAME, LAST3_FRAME, and
LAST4_FRAME.
Coding efficiency: derflr +1.601%; hevchr +1.895%
Speed: Encoder slowed down by ~75%
Change-Id: Ifeee5f049c2c1f7cb29bc897622ef88897082ecf
Remove MISC_FIXES flags except for the changes on MV precision, which
has a 0.1% performance drop.
On derflr, the impact is -0.012%.
Change-Id: I0a74e5a212dd0cb827192a318c92a714c9681e45
Reset the effective range of inter_tx_size, instead of the entire
array in the rate-distortion optimization loop.
Change-Id: Id453fbd6dddfe69f4e451ba8518c083326d5dd53
This commit re-designs the alternate reference frame generation
process. It employs non-local mean approach to produce more stable
pixel estimation for alternate reference frame. It improves the
compression performance gains:
derf 0.5%
hevcmr 0.8%
stdhd 1.3%
hevchr 1.0%
The encoding time at speed 0 is not affected.
Change-Id: Iaa757f0da189ce93812d69617a81bf630d449848
This commit fixes an encoding failure case triggered when early
termination feature is turned on for transform block size search.
It resolves the corresponding enc/dec mismatch issue.
Change-Id: I2c5b7d8b1efe25fe3810e6ed307f4b1865dede49
Adds a new interpolation experiment.
Improves entropy coding to send the filter type only if
the motion vectors have subpel components.
Adds one new 8-tap smooth filter, and tweaks the others.
derflr: +0.695%
hevcmr: +0.305%
About 5% encode slowdown. No visible impact for decoding.
Also makes the interpolation framework flexible to support both
strictly interpolating filters as well as non-interpolating
filters that filter integer offsets. This is mainly for
further experimentation and if not found useful the code will
be removed.
Change-Id: I8db9cde56ca916be771fe54a130d608bf10786e6
This commit refactors the rate-distortion optimization scheme for
transform block coding. When both ext-tx and var-tx experiments
are turned on, the encoding time for bus_cif at 1000 kbps goes down
from 706377 ms to 666503 ms (5.6% speed-up). The coding statics
remain unchanged.
Change-Id: I20835db573725580aad79c16220f799ce01f2093
Currently there are two parts in this experiment: extra directional intra
prediction modes and the filter intra modes migrated from the nextgen branch.
Several macros are defined in "blockd.h" to provide controls of the experiment
settings. Setting "DR_ONLY" as 1 (default is 0) means we only use directional
modes, and skip the filter-intra modes; "EXT_INTRA_ANGLES" (default is 128)
defines the number of different angles we want to support; setting
"ANGLE_FAST_SEARCH" as 1 (default is 1) means we use fast sub-optimal search
for the best prediction angle, instead of exhaustive search. The fast search
is about 6 times faster than the exhaustive search, while preserving about
60% of the coding gains.
With extra directional prediction modes (fast search), we observe the following
code gains (number in parentheses is for all-key-frame setting):
derflr +0.42% (+1.79%)
hevclr +0.78% (+2.19%)
hevcmr +1.20% (+3.49%)
stdhd +0.56%
Speed-wise, about 110% slower for key frames, and 30% slower overall.
The gains of filter intra modes mostly add up with the gains of directional
modes. The overall coding gain of this experiment:
derflr +0.94%
hevclr +1.46%
hevcmr +1.94%
stdhd +1.58%
Change-Id: Ida9ad00cdb33aff422d06eb42b4f4e5f25df8a2a
This patch eliminates the copying of data when using FLIPADST forward
transforms, by incorporating the necessary data flipping into the
load_buffer_* functions of the SSE2 optimized forward transforms. The
load_buffer_* functions are normally inlined, so the overhead of copying
the data is removed and the overhead of flipping is minimized. Left to
right flipping is still not free, as the columns need to be shuffled in
registers.
To preserve identity between the C and SSE2 implementations, the
appropriate C implementations now also do the data flipping as part of
the transform, rather than relying on the caller for flipping the input.
Overall speedup is about 1.5-2% in encode on my tests. Note that these
are only the forward transforms. Inverse transforms to come in a later
patch.
There are also a few code hygiene changes:
- Fixed some indents of switch statements.
- DCT_DCT transform now always use vp10_fht* functions, which dispatch
to vpx_fdct* for DCT_DCT (some of them used to call vpx_fdct*
directly, some of them used to call vp10_fht*).
Change-Id: I93439257dc5cd104ac6129cfed45af142fb64574
These tables were out of sync with the indexing enum since the
refactoring in commit 4f16f119 (change 303389), due to the removal
of the ext_tx_to_txtype lookup table. This patch just puts them
back in order.
Change-Id: Ieb7d57654f61b99b511d54c9ba09abbd5e8d0d14
This commit re-works the rate-distortion optimization scheme for
transform coding. It improves the overall compression performance.
For derf set, the ext-tx experiment provides 2.27% coding gains,
and the new scheme that integrates multiple transform type selection
and recursive transform block partitioning provides a total of 3.24%
coding gains.
Change-Id: Ia1887c4c44b73dfb915d091d96660a99f09d5cc3
This commit hooks up the rate-distortion optimization system to
fully exploit recursive transform block partition and multiple
transform type. The compression performance of the two experiments
largely adds up. For derf set, ext-tx provides additional 2.1%
coding gains on top of the gains due to recursive transform block
partition (0.69%).
Change-Id: I1091fb9545f74e489a6a2489dc3c12f5abd05043
Correctly compute the block size in bit-stream coefficient token
packing. This fixes an enc/dec mismatch at very high bit-rates.
Change-Id: I37bf084731dc660df0c695cad406ddcd0f9eb904
This commit allows the loop filter to account for the recursive
transform block partition when selecting the filter and mask.
Change-Id: I62b6c2dcc0497cbe1f264b03c46163f55d2c9752
This commit refactors the loop filter selection process to support
variable transform block sizes based filter mask. It disables the
multi-thread loop filter implementation to simplify the experiments.
The speed impact on speed 0 encoding is negligible.
Change-Id: Ia470b6da9ad833fe6eb72d2cbeda9296b21910ec
If a block has all coefficients quantized to zero, the codec will
assume that it uses largest transform block size.
Change-Id: Icd4e8e7cdc4b6af6974f87169e50b040ebfe9020
Allows inter and intra tx_types to have different sets of
transforms for different tx_size/sb_type combinations.
Change-Id: Ic0ac1daef7a9fb15c4210271e4d04cd36e5cec8e
Rework the rate distortion optimization pipeline. Use precise
distortion metric that accounts for the forward and inverse
transform rounding effect.
Change-Id: Ibe19ce9791ec3547739294cc3012dd9e11f4ea49
This commit makes the coefficient token packtization process account
for variable transform block sizes supported in a single processing
block. It fixes an enc/dec mismatch issue when var-tx, ext-tx, and
misc-fixes experiments are all turned on.
Change-Id: I2e8946e6f72de567603a568debbadad11196430c
Remove delta index 254 from probability remapping and subexp coding.
Saves 1-bit when the delta index is 129.
Change-Id: I88aba565fc766b1769165be458d2efd3ce45817e
