1. 22 May, 2013 1 commit
  2. 16 May, 2013 1 commit
    • Paul Wilkins's avatar
      New inter mode context. · 6ff3eb16
      Paul Wilkins authored
      This patch creates a new inter mode contest that avoids
      a dependence on the reconstructed motion vectors from
      neighboring blocks. This was a change requested by
      a hardware vendor to improve decode performance.
      
      As part of this change I have also made some modifications
      to stats output code (under a flag) to allow accumulation of
      inter mode context flags over multiple clips
      
      Some further changes will be required to accommodate the
      deprecation of the split mv mode over the next few days.
      
      Performance as stands is around -0.25% on derf and
      std-hd but up on the YT and YT-HD sets. With further tuning
      or some adjustment to the context criteria it should be
      possible to make this change broadly neutral.
      
      Change-Id: Ia15cb4470969b9e87332a59c546ae0bd40676f6c
      6ff3eb16
  3. 10 May, 2013 1 commit
    • Yunqing Wang's avatar
      Add joint motion search in comp_inter_inter mode(experiment) · 9f5811c2
      Yunqing Wang authored
      In current code, motion vectors got from single prediction mode are used
      in compound prediction mode directly. These motion vectors may not give
      accurate prediction since they are searched independently. In this patch,
      we took Pascal's suggestion, and did joint motion search in compound
      prediction mode to find better motion vectors in this situation.
      Test results:
      Overall PSNR: 0.570%(derf), 0.918%(stdhd);
      SSIM: 0.572%(derf), 1.009%(stdhd);
      
      The encoder is a little slower. This can be improved since some c
      code is used in motion search.
      
      Change-Id: Ib30c9240f6c56c9b070867b4ca89412a76d9f3c6
      9f5811c2
  4. 26 Apr, 2013 2 commits
    • John Koleszar's avatar
      Remove BLOCKD structure · bb41ab4a
      John Koleszar authored
      All members can be referenced from their per-plane counterparts, and
      removes assumptions about 24 blocks per macroblock.
      
      Change-Id: I7ff2fa72d22c29163eb558981c8193765a8113d9
      bb41ab4a
    • Scott LaVarnway's avatar
      Removed bmi from blockd · 57f180b3
      Scott LaVarnway authored
      This originally was "Removed update_blockd_bmi()".  Now,
      this patch removed bmi from blockd and uses the bmi found
      in mode_info_context.  Eliminates unnecessary bmi copies between
      blockd and mode_info_context.
      
      Change-Id: I287a4972974bb363f49e528daa9b2a2293f4bc76
      57f180b3
  5. 25 Apr, 2013 1 commit
    • John Koleszar's avatar
      Remove BLOCK structure · 4bd0f4f6
      John Koleszar authored
      All members can be referenced from their per-plane counterparts, and
      removes assumptions about 24 blocks per macroblock.
      
      Change-Id: I593fb0715e74cd84b48facd1c9b18c3ae1185d4b
      4bd0f4f6
  6. 13 Mar, 2013 1 commit
    • Jingning Han's avatar
      Support +/-2048 motion vector coding · 76c12ab9
      Jingning Han authored
      Enable entropy coding of motion vectors up to +/-2048. Also
      extend the motion search range accordingly.
      
      Change-Id: Iac2bb015e8934521cef83a19edbe967d9f097436
      76c12ab9
  7. 08 Mar, 2013 1 commit
    • Jingning Han's avatar
      Extend diff MV limit from +/-256 to +/-1024 · 2a5278bd
      Jingning Han authored
      Increase the motion search range by 4x. Change MV_CLASS tree of the
      entropy coding to allow two additional mv classes to cover the
      extended motion vector limit. The codec determines the effective
      motion search range conditioned on the actual frame dimension.
      
      It provides coding gains:
      
      stdhd 0.39%
      yt    0.56%
      hd    0.47%
      
      Major coding performance gains are packed in several sequences with
      intense motion activities, e.g., ped_1080p gains 7% at high bit-rates,
      and on average 3%.
      
      TODO: Need to further tune the rate control and motion search units.
      
      Change-Id: Ib842540a6796fbee5a797809433ef6a477c6d78d
      2a5278bd
  8. 28 Feb, 2013 1 commit
    • Dmitry Kovalev's avatar
      Code cleanup. · dcbdda8e
      Dmitry Kovalev authored
      Lower case variable names, converting while loops to for loops.
      
      Change-Id: Ic3b973391eef7472a99d18d02fe79cfef5e04e62
      dcbdda8e
  9. 20 Feb, 2013 1 commit
  10. 18 Dec, 2012 1 commit
  11. 08 Dec, 2012 1 commit
    • Ronald S. Bultje's avatar
      Introduce vp9_coeff_probs/counts/stats/accum types. · 885cf816
      Ronald S. Bultje authored
      Use these, instead of the 4/5-dimensional arrays, to hold statistics,
      counts, accumulations and probabilities for coefficient tokens. This
      commit also re-allows ENTROPY_STATS to compile.
      
      Change-Id: If441ffac936f52a3af91d8f2922ea8a0ceabdaa5
      885cf816
  12. 30 Nov, 2012 1 commit
  13. 28 Nov, 2012 2 commits
  14. 27 Nov, 2012 1 commit
    • John Koleszar's avatar
      Add vp9_ prefix to all vp9 files · fcccbcbb
      John Koleszar authored
      Support for gyp which doesn't support multiple objects in the same
      static library having the same basename.
      
      Change-Id: Ib947eefbaf68f8b177a796d23f875ccdfa6bc9dc
      fcccbcbb
  15. 08 Nov, 2012 1 commit
  16. 06 Nov, 2012 1 commit
  17. 01 Nov, 2012 2 commits
  18. 31 Oct, 2012 2 commits
  19. 22 Oct, 2012 1 commit
  20. 06 Sep, 2012 1 commit
    • Deb Mukherjee's avatar
      New motion vector entropy coding · 00f9eb65
      Deb Mukherjee authored
      Adds a new experiment with redesigned/refactored motion vector entropy
      coding. The patch also takes a first step towards separating the
      integer and fractional pel components of a MV. However the fractional
      pel encoding still depends on the integer pel part and so they are
      not fully independent. Further experiments are in progress to see
      how much they can be decoupled without affecting performance.
      All components including entropy coding/decoding, costing for MV
      search, forward updates and backward updates to probability tables,
      have been implemented.
      
      Results so far:
      derf: +0.19%
      std-hd: +0.28%
      yt: +0.80%
      hd: +1.15%
      
      Patch: Simplifies the fractional pel models:
      derf: +0.284%
      std-hd: +0.289%
      yt: +0.849%
      hd: +1.254%
      
      Patch: Some changes in the models, rebased.
      derf: +0.330%
      std-hd: +0.306%
      yt: +0.816%
      hd: +1.225%
      
      Change-Id: I646b3c48f3587f4cc909639b78c3798da6402678
      00f9eb65
  21. 09 Aug, 2012 1 commit
  22. 08 Aug, 2012 1 commit
  23. 07 Aug, 2012 1 commit
  24. 03 Aug, 2012 1 commit
    • Deb Mukherjee's avatar
      Merging in high_precision_mv experiment · 2af5473a
      Deb Mukherjee authored
      Merged in the high_precision_mv experiment to make it easier
      to work on new mv encoding strategies. Also removed
      coef_update_probs3().
      
      Change-Id: I82d3b0bb642419fe05dba82528bc9ba010e90924
      2af5473a
  25. 17 Jul, 2012 1 commit
  26. 11 Jun, 2012 1 commit
    • John Koleszar's avatar
      Fix pedantic compiler warnings · 0164a1cc
      John Koleszar authored
      Allows building the library with the gcc -pedantic option, for improved
      portabilty. In particular, this commit removes usage of C99/C++ style
      single-line comments and dynamic struct initializers. This is a
      continuation of the work done in commit 97b766a4, which removed most
      of these warnings for decode only builds.
      
      Change-Id: Id453d9c1d9f44cc0381b10c3869fabb0184d5966
      0164a1cc
  27. 15 Mar, 2012 1 commit
    • Yaowu Xu's avatar
      WebM Experimental Codec Branch Snapshot · 6035da54
      Yaowu Xu authored
      This is a code snapshot of experimental work currently ongoing for a
      next-generation codec.
      
      The codebase has been cut down considerably from the libvpx baseline.
      For example, we are currently only supporting VBR 2-pass rate control
      and have removed most of the code relating to coding speed, threading,
      error resilience, partitions and various other features.  This is in
      part to make the codebase easier to work on and experiment with, but
      also because we want to have an open discussion about how the bitstream
      will be structured and partitioned and not have that conversation
      constrained by past work.
      
      Our basic working pattern has been to initially encapsulate experiments
      using configure options linked to #IF CONFIG_XXX statements in the
      code. Once experiments have matured and we are reasonably happy that
      they give benefit and can be merged without breaking other experiments,
      we remove the conditional compile statements and merge them in.
      
      Current changes include:
      * Temporal coding experiment for segments (though still only 4 max, it
        will likely be increased).
      * Segment feature experiment - to allow various bits of information to
        be coded at the segment level. Features tested so far include mode
        and reference frame information, limiting end of block offset and
        transform size, alongside Q and loop filter parameters, but this set
        is very fluid.
      * Support for 8x8 transform - 8x8 dct with 2nd order 2x2 haar is used
        in MBs using 16x16 prediction modes within inter frames.
      * Compound prediction (combination of signals from existing predictors
        to create a new predictor).
      * 8 tap interpolation filters and 1/8th pel motion vectors.
      * Loop filter modifications.
      * Various entropy modifications and changes to how entropy contexts and
        updates are handled.
      * Extended quantizer range matched to transform precision improvements.
      
      There are also ongoing further experiments that we hope to merge in the
      near future: For example, coding of motion and other aspects of the
      prediction signal to better support larger image formats, use of larger
      block sizes (e.g. 32x32 and up) and lossless non-transform based coding
      options (especially for key frames). It is our hope that we will be
      able to make regular updates and we will warmly welcome community
      contributions.
      
      Please be warned that, at this stage, the codebase is currently slower
      than VP8 stable branch as most new code has not been optimized, and
      even the 'C' has been deliberately written to be simple and obvious,
      not fast.
      
      The following graphs have the initial test results, numbers in the
      tables measure the compression improvement in terms of percentage. The
      build has  the following optional experiments configured:
      --enable-experimental --enable-enhanced_interp --enable-uvintra
      --enable-high_precision_mv --enable-sixteenth_subpel_uv
      
      CIF Size clips:
      http://getwebm.org/tmp/cif/
      HD size clips:
      http://getwebm.org/tmp/hd/
      (stable_20120309 represents encoding results of WebM master branch
      build as of commit#7a159071)
      
      They were encoded using the following encode parameters:
      --good --cpu-used=0 -t 0 --lag-in-frames=25 --min-q=0 --max-q=63
      --end-usage=0 --auto-alt-ref=1 -p 2 --pass=2 --kf-max-dist=9999
      --kf-min-dist=0 --drop-frame=0 --static-thresh=0 --bias-pct=50
      --minsection-pct=0 --maxsection-pct=800 --sharpness=0
      --arnr-maxframes=7 --arnr-strength=3(for HD,6 for CIF)
      --arnr-type=3
      
      Change-Id: I5c62ed09cfff5815a2bb34e7820d6a810c23183c
      6035da54
  28. 06 Mar, 2012 1 commit
  29. 01 Mar, 2012 1 commit
  30. 30 Jan, 2012 1 commit
  31. 09 Dec, 2011 1 commit
  32. 30 Jun, 2011 1 commit
    • Yunqing Wang's avatar
      Bug fix in motion vector limit calculation · b7480454
      Yunqing Wang authored
      Motion vector limits are calculated using right shifts, which
      could give wrong results for negative numbers. James Berry's
      test on one clip showed encoder produced some artifacts. This
      change fixed that.
      
      Change-Id: I035fc02280b10455b7f6eb388f7c2e33b796b018
      b7480454
  33. 06 Jun, 2011 1 commit
  34. 25 May, 2011 1 commit
    • Yaowu Xu's avatar
      fix the mix use of errorperbit and sadperbit · d8c525b8
      Yaowu Xu authored
      error_per_bit and sad_per_bit were designed as estimates of a bit worth
      of sum squared error and sum absolute difference respectively. Under
      this assumption, error_per_bit should be used in combination with 2nd
      order errors (variance or sum squared error) while sad_per_bit should
      be used in combination with 1st order SADs in motion estimation. There
      were a few places where sad_per_bit has been misused with variances,
      this commit changes to use error_per_bit for those places, also changes
      parameter names to properly indicate which constant is being used.
      
      On cif set, the change has a universal gain by all metrics: 0.13% by
      average/overall psnr and 0.1% by ssim.
      
      Change-Id: I4850fdcc3fd6886b30f784bd843f13dd401215fb
      d8c525b8
  35. 12 May, 2011 1 commit
    • Scott LaVarnway's avatar
      Using int_mv instead of MV · 6b25501b
      Scott LaVarnway authored
      The compiler produces better assembly when using int_mv
      for assignments.  The compiler shifts and ors the two 16bit
      values when assigning MV.
      
      Change-Id: I52ce4bc2bfbfaf3f1151204b2f21e1e0654f960f
      6b25501b
  36. 09 May, 2011 1 commit
    • Yunqing Wang's avatar
      Use diamond search to replace full search in full-pixel refining search · cb7b1fb1
      Yunqing Wang authored
      In NEWMV mode, currently, full search is used as the refining search
      after n-step search. By replacing it with an iterative diamond search
      of radius 1 largely reduced the computation complexity, but still
      maintained the same encoding quality since the refining search is
      done for every macroblock instead of only a small precentage of
      macroblocks while using full search.
      
      Tests on the test set showed a 3.4% encoding speed increase with none
      psnr & ssim loss.
      
      Change-Id: Ife907d7eb9544d15c34f17dc6e4cfd97cb743d41
      cb7b1fb1