Ronald S. Bultje [Mon, 20 Aug 2012 21:43:34 +0000 (14:43 -0700)]
Superblock coding.
This commit adds a pick_sb_mode() function which selects the best 32x32
superblock coding mode. Then it selects the best per-MB modes, compares
the two and encodes that in the bitstream.
The bitstream coding is rather simplistic right now. At the SB level,
we code a bit to indicate whether this block uses SB-coding (32x32
prediction) or MB-coding (anything else), and then we follow with the
actual modes. This could and should be modified in the future, but is
omitted from this commit because it will likely involve reorganizing
much more code rather than just adding SB coding, so it's better to let
that be judged on its own merits.
Gains on derf: about even, YT/HD: +0.75%, STD/HD: +1.5%.
Ronald S. Bultje [Thu, 16 Aug 2012 18:09:31 +0000 (11:09 -0700)]
Set a default mv entropy if no tokens are coded.
This doesn't affect the result, since there are no MVs coded using this
entropy. It does, however, silence valgrind warnings about uninitialized
variables.
Yaowu Xu [Mon, 6 Aug 2012 17:51:20 +0000 (10:51 -0700)]
Changed to use reference mv as nearest mv
The reference motion vector selected by surrounding pixels that has
the best matching score is used as nearest motion vector.
The change has shown consistent gain on all test sets, compression
gains range from .2% to .6%. The variation is largely dependent on
various other experiments on or off.
Paul Wilkins [Fri, 10 Aug 2012 13:12:43 +0000 (14:12 +0100)]
Code cleanup.
Add local variable in several places to reference the MB mode
info structure. Currently this is usually accessed in the code as
x->e_mbd.mode_info_context->mbmi.* or in some places
xd->mode_info_context->mbmi.*
Resolved some uses of x-> for the MACROBLOCKD structure.
Rebased without dependency on motion reference experiment.
Merge "Cleanup and commenting of the sub-pixel interpolation functions. Mostly as a preparation for the upcoming vectorized implementation." into experimental
Yaowu Xu [Tue, 7 Aug 2012 20:55:49 +0000 (13:55 -0700)]
A bit of temporary relief on encoder slowness
The commit replaces run-time initialization of cosine constants with
static constant values, which provides ~30% relief on slow speed. The
real solution, however will be to implement integer versions of those
functions that current use float/double.
Yaowu Xu [Fri, 3 Aug 2012 19:31:38 +0000 (12:31 -0700)]
enable interleaved decoding of mode and mv
Previouly, the decoding of mode and motion vector are done a per frame
basis followed by residue decoding and reconstuction. The commit added
the option to allow decoder to interleave the decoding of mode and mvs
with the residue decoding on a per MB basis.
Daniel Kang [Fri, 3 Aug 2012 00:03:14 +0000 (17:03 -0700)]
16x16 DCT blocks.
Set on all 16x16 intra/inter modes
Features:
- Butterfly fDCT/iDCT
- Loop filter does not filter internal edges with 16x16
- Optimize coefficient function
- Update coefficient probability function
- RD
- Entropy stats
- 16x16 is a config option
Jingning Han [Wed, 1 Aug 2012 17:18:25 +0000 (10:18 -0700)]
Use 8x8 DCT transform for I8X8 prediction mode
Apply 2D-DCT transform of dimension 8x8 to encode prediction
residuals of I8X8 mode.
Brought back block type 3 probability context model for 8x8 tokens,
which is used for the coefficients of Y blocks in I8x8 modes. The
coefficient costs estimate of I8X8 mode in rate-distortion is also
changed appropriately.
Performance results:
derf: 0.246
yt: 0.114
std-hd: 0.730
hd: 0.670
Deb Mukherjee [Sat, 28 Jul 2012 00:46:33 +0000 (17:46 -0700)]
Merging and bug-fix in enhanced_interp experiment
Merged the enhanced_interp experiment.
Found and fixed a bug in the include files framework, whereby
certain encoder files were still using the old INTERP_EXTEND
value of 3 instead of 4. The thresholds for mv range mcomp.c
need a small adjustment to prevent crashes.
Deb Mukherjee [Wed, 18 Jul 2012 20:43:01 +0000 (13:43 -0700)]
Adds support for switchable interpolation filters.
Allows for swtiching/setting interpolation filters at the MB
level. A frame level flag indicates whether to use a specifc
filter for the entire frame or to signal the interpolation
filter for each MB. When switchable filters are used, the
encoder chooses between 8-tap and 8-tap sharp filters. The
code currently has options to explore other variations as well,
which will be cleaned up subsequently.
One issue with the framework is that encoding is slow. I
tried to do some tricks to speed things up but it is still slow.
Decoding speed should not be affected since the number of
filter taps remain unchanged.
With the current version, we are up 0.5% on derf on average but
some videos city/mobile improve by close to 4 and 2% respectively.
If we did a full-search by turning the SEARCH_BEST_FILTER flag
on, the results are somewhat better.
The framework can be combined with filtered prediction, and I
seek feedback regarding that.
Deb Mukherjee [Fri, 27 Jul 2012 18:29:46 +0000 (11:29 -0700)]
Merges several experiments
The following five experiments are merged:
newentropy
newupdate
adaptive_entropy (also includes a couple of parameter changes
that improves results a little
in common/entropymode.c and encoder/modecosts.c
that were not merged from the internal branch)
newintramodes
expanded_coef_context
Jingning Han [Mon, 25 Jun 2012 19:26:09 +0000 (12:26 -0700)]
Adds hybrid transform
Adds ADST/DCT hybrid transform coding for Intra4x4 mode.
The ADST is applied to directions in which the boundary
pixels are used for prediction, while DCT applied to
directions without corresponding boundary prediction.
Adds enum TX_TYPE in b_mode_infor to indicate the transform
type used.
Make coding style consistent with google style.
Fixed the commented issues.
Experimental results in terms of bit-rate reduction:
derf: 0.731%
yt: 0.982%
std-hd: 0.459%
hd: 0.725%
the integer version has very good precision, the float version is no
longer useful. this commit also removes the experiment option from
configure script.
this commit removes a number of experiment options from configure
script. the associated experiments are already fully merged, the
options in configure script have no effect at all.
projects / libvpx / log