Jingning Han [Thu, 21 May 2015 19:44:29 +0000 (12:44 -0700)]
Enable arbitrary tile size support
This commit allows the encoder to process tile coding per 64x64
block. The supported upper limit of tile resolution is the minimum
of frame size and 4096 in each dimension. To turn on, set
--experiment --row-tile
and compile.
It overwrite the old --tile-columns and --tile-rows configurations.
These two parameters now tell the encoder the width and height of
tile in the unit of 64x64 block. For example,
--tile-columns=1 --tile-rows=1
will make a tile contains a single 64x64 block.
Jingning Han [Wed, 20 May 2015 17:15:25 +0000 (10:15 -0700)]
Refactor internal tile_info variables to support 1024 tiles
Move the 2D tile info arrays as global variables. This resolves
the local function stack overflow issue due to excessively large
tile info variables. This allows the internal operation to support
up to 1024 row and column tiles.
Jingning Han [Wed, 20 May 2015 00:17:28 +0000 (17:17 -0700)]
Support up to 64 row tile coding
This commit allows the codec to use up to row tiles (optionally
in combination with up to 64 column tiles per row tile). The
minimum tile size is set to be 256x256 pixel block.
Jingning Han [Tue, 19 May 2015 22:21:46 +0000 (15:21 -0700)]
Rename variables in tile info decoding
The max and min tile number reference should be used to support
both row and column tiles. This commit renames the previous col
prefix to avoid confusion.
Julia Robson [Mon, 18 May 2015 10:52:44 +0000 (11:52 +0100)]
Fix mismatch in handling of 8x4/4x8 blocks with supertx
Test VP9/EndToEndTestLarge.EndtoEndPSNRTest/1 (422 stream) failed when
supertx enabled. This was because 4x8 and 8x4 blocks were not being
split into 4x4s during tokenization in the encoder. This patch
uses vp9_foreach_transformed_block() to fix this.
Zoe Liu [Sat, 11 Apr 2015 00:08:31 +0000 (17:08 -0700)]
Cleaned mv search code and added a few fixes on the experiments
Besides code cleaning, this patch contains 3 fixes:
(1) Fixed the COMPOUND_MODES for the NEW_NEWMV mode;
(2) Fixed the joint search when the NEAR_FORNEWMV mode (in NEWMVREF)
is being evaluated;
(3) Fixed the WEDGE_PARTITION when the NEAR_FORNEWMV mode (in NEWMVREF)
is being evaluated.
(4) Adjusted the entropy probability value for NEAR_FORNEW mode.
On derflr turning on all 14 experiments (except for global-motion), the
average gain w.r.t. PSNR is +0.07%:
Maximum on bridge_far_cif: +1.02%
Minimum on hallmonitor_cif: -0.16%
hui su [Tue, 21 Apr 2015 21:10:19 +0000 (14:10 -0700)]
Optimize entropy coding of non-transform tokens
Use separate token probabilities and counters for non-transform
blocks (pixel domain) . Initial probabilities are trained with screen_content
clips. On screen_content, it improves coding performance by about
2% (from +16.4% to +18.45%).
The initial probabilities are not optimized for natural videos. So it should
not be used for natural videos. Set FOR_SCREEN_CONTENT as 0/1 to specify
whether or not to enable this patch.
Implements a first version of global motion where the
existing ZEROMV mode is converted to a translation only
global motion mode.
A lot of the code for supporting a rotation-zoom affine
model is also incorporated.
WIP.
Peter de Rivaz [Thu, 11 Dec 2014 15:54:23 +0000 (15:54 +0000)]
Corrected optimization of 8x8 DCT code
The 8x8 DCT uses a fast version whenever possible.
There was a mistake in the checking code which
meant sometimes the fast version was used when it
was not safe to do so.
Peter de Rivaz [Mon, 10 Nov 2014 16:17:49 +0000 (16:17 +0000)]
Fixed idct16x16_10 highbitdepth transform
In the case when there are only non-zero coefficients
in the first 4x4 block a special routine is called.
The highbitdepth optimized version of this routine
examined the wrong positions when deciding whether
to call an assembler or C inverse transform.
Peter de Rivaz [Fri, 24 Oct 2014 07:37:39 +0000 (08:37 +0100)]
Refactored idct routines and headers
This change is made in preparation for a
subsequent patch which adds acceleration
for the highbitdepth transform functions.
The highbitdepth transform functions attempt
to use 16/32bit sse instructions where possible,
but fallback to using the C implementations if
potential overflow is detected. For this reason
the dct routines are made global so they can be
called from the acceleration functions in the
subsequent patch.
Zoe Liu [Thu, 30 Apr 2015 00:47:45 +0000 (17:47 -0700)]
Changed nearmv for one of the sub8x8 partitions
It is a minor change, but the essential idea is to use the mv of the
top right block as the nearmv for the bottom left partition in the
sub8x8 block. The change is under the experiment of NEWMVREF.
When all 13 experiments are on (except for INTRABC), the gain is +0.05%:
Worse on bowing_cif: -0.17%
Best on foreman_cif: +0.42%; and bridge_far_cif: +0.40%
The total 13 experiments achieved a gain of +6.97% against base.
Alex Converse [Thu, 30 Apr 2015 19:52:36 +0000 (12:52 -0700)]
tx_skip: Avoid undefined shift behavior.
vp9_quantize_rect did illegal shifts but didn't use the results.
The shift |a << b| is unfortunately undefined if |a < 0|, but the
more verbose |a * (1 << b)| generates the same machine code.
James Zern [Sat, 14 Mar 2015 01:49:03 +0000 (18:49 -0700)]
usage.dox: fix doxygen warnings in 1.8.x
use \li to denote list items with \if.
fixes the following likely visible in <1.8.3:
usage.dox: warning: Invalid list item found
usage.dox: warning: End of list marker found without any preceding list items
* Uses double for RD cost computation to guard against overflow
for large resolution frames.
* Use previous frame's filter level to code the level better.
* Change precision of the filter parameters.
* Allow spatial variance for x and y to be different
Change-Id: I1669f65eb0ab1e8519962954c92d59e04f1277b7
derflr: +0.556% (a little up from before)
hui su [Mon, 30 Mar 2015 23:36:15 +0000 (16:36 -0700)]
tx-skip experiment: improve entropy coding of coeff tokens
This patch allows the prediction residues of tx-skipped blocks
to use probs that are different from regular transfrom
coefficients for token entropy coding. Prediction residues are
assumed as in band 6.
The initial value of probs is obtained with stats from limited
tests. The statistic model for constrained token nodes has not
been optimized. The probs for token extra bits have not been
optimized. These can be future work.
Certain coding improvment is observed:
derflr with all experiments: +6.26% (+0.10%)
screen_content with palette: +22.48% (+1.28%)
Zoe Liu [Tue, 17 Mar 2015 23:48:48 +0000 (16:48 -0700)]
Add a new PREDICTION mode using NEARMV as ref mv
This experiment, referred as NEWMVREF, also merged with NEWMVREF_SUB8X8
and the latter one has been removed. Runborgs results show that:
(1) Turning on this experiment only, compared against the base:
derflf: Average PSNR 0.40%; Overall PSNR 0.40%; SSIM 0.35%
(2) Turning on all the experiments including this feature, compared against
that without this feature, on the highbitdepth case using 12-bit:
derflf: Average PSNR 0.33%; Overall PSNR 0.32%; SSIM 0.30%.
Now for highbitdepth using 12-bit, compared against base:
derflf: Average PSNR 11.12%; Overall PSNR 11.07%; SSIM 20.27%.
hui su [Thu, 19 Mar 2015 22:55:29 +0000 (15:55 -0700)]
Palette experiment: encode color indices based on context
The basic idea is to use a pixel’s neighboring colors as
context to predict its own color. Up to 4 neighbors are
considered here: left, left-above, above, right-above.
To reduce the number of contexts, the combination of any
4 (or less) colors are mapped to a reduced number of
patterns. For example, 1111, 2222, 3333, … , can be mapped
to the same pattern: AAAA. SImilarly, 1122, 1133, 2233, …,
can be mapped to the pattern AABB. In this way, the total
number of color contexts is reduced to 16.
This almost doubles the gain of palette coding on screen
content videos.
on screen_content
--enable-palette +14.2%
--enable-palette --enable-tx-skip +21.2%
on derflr
--enable-palette +0.12%
with all other experiments +6.16%
hui su [Wed, 25 Feb 2015 18:00:40 +0000 (10:00 -0800)]
Add palette coding mode for inter frames
on screen_content
--enable-palette +6.74%
on derflr
with all other experiments +6.02%
(--enable-supertx --enable-copy-mode
--enable-ext-tx --enable-filterintra
--enable-tx64x64 --enable-tx-skip
--enable-interintra --enable-wedge-partition
--enable-compound-modes --enable-new-quant
--enable-palette)
Deb Mukherjee [Wed, 4 Mar 2015 22:04:11 +0000 (14:04 -0800)]
Non-uniform quantization experiment
This framework allows lower quantization bins to be shrunk down or
expanded to match closer the source distribution (assuming a generalized
gaussian-like central peaky model for the coefficients) in an
entropy-constrained sense. Specifically, the width of the bins 0-4 are
modified as a factor of the nominal quantization step size and from 5
onwards all bins become the same as the nominal quantization step size.
Further, different bin width profiles as well as reconstruction values
can be used based on the coefficient band as well as the quantization step
size divided into 5 ranges.
A small gain currently on derflr of about 0.16% is observed with the
same paraemters for all q values.
Optimizing the parameters based on qstep value is left as a TODO for now.
Results on derflr with all expts on is +6.08% (up from 5.88%).
Experiments are in progress to tune the parameters for different
coefficient bands and quantization step ranges.
projects / libvpx / log