1. 20 Sep, 2012 1 commit
  2. 17 Sep, 2012 1 commit
  3. 12 Sep, 2012 1 commit
  4. 11 Sep, 2012 1 commit
  5. 10 Sep, 2012 1 commit
    • Deb Mukherjee's avatar
      Hybrid transform cleanups · c5af82b7
      Deb Mukherjee authored
      Some cleanups that will make it easier to maintain the code
      and incorporate upcoming changes on  entropy coding for the
      hybrid transforms.
      
      Change-Id: I44bdba368f7b8bf203161d7a6d3b1fc2c9e21a8f
      c5af82b7
  6. 07 Sep, 2012 2 commits
    • Paul Wilkins's avatar
      Partial merge of NEWBESTREFMV and NEW_MVREF. · 778ec421
      Paul Wilkins authored
      This commit merges those parts of the CONFIG_NEW_MVREF
      that specifically relate to choosing a better set of candidate
      MV references into the NEWBESTREFMV experiment.
      
      CONFIG_NEW_MVREF will then be used for changes relating
      to the explicit coding of a cost optimized MV reference in the
      bitstream as part of MV coding.
      
      Change-Id: Ied982c0ad72093eab29e38b8cd74d5c3d7458b10
      778ec421
    • Paul Wilkins's avatar
      MV reference changes · 38e1c791
      Paul Wilkins authored
      Extend experiment to use both vectors from MBs
      coded using compound prediction as candidates.
      
      In final sort only consider best 4 candidates
      for now but make sure 0,0 is always one of them.
      
      Other minor changes to new MV reference code.
      Pass in Mv list to vp8_find_best_ref_mvs().
      
      Change-Id: Ib96220c33c6b80bd1d5e0fbe8b68121be7997095
      38e1c791
  7. 30 Aug, 2012 1 commit
    • Jingning Han's avatar
      hybrid transform of 16x16 dimension · de6dfa6b
      Jingning Han authored
      Enable ADST/DCT of dimension 16x16 for I16X16 modes. This change provides
      benefits mostly for hd sequences.
      
      Set up the framework for selectable transform dimension.
      
      Also allowing quantization parameter threshold to control the use
      of hybrid transform (This is currently disabled by setting threshold
      always above the quantization parameter. Adaptive thresholding can
      be built upon this, which will further improve the coding performance.)
      
      The coding performance gains (with respect to the codec that has all
      other configuration settings turned on) are
      
      derf:   0.013
      yt:     0.086
      hd:     0.198
      std-hd: 0.501
      
      Change-Id: Ibb4263a61fc74e0b3c345f54d73e8c73552bf926
      de6dfa6b
  8. 28 Aug, 2012 1 commit
  9. 24 Aug, 2012 1 commit
    • Paul Wilkins's avatar
      New Motion Reference Search · 2d60bee1
      Paul Wilkins authored
      Alternative strategy for finding a list of candidate motion
      vectors to use as reference values in mv coding and as
      nearest and near.
      
      Sort by sad in vp8_find_best_ref_mvs() rather than just
      pick the best. Allow 0,0 as a best ref option but not a
      nearest or near unless there are no alternatives.
      
      Encode/Decode verified on at least some clips.
      
      Some commented out experimental and stats code still in place.
      
      Gain over existing code averages about 1% on derf (alll metrics)
      with improvement on all clips. Other test results pending.
      
      The entropy coding of the mode (nearest/near etc) still
      depends upon and requires the old "findnear" code so
      this needs looking at and may provide room for further gains.
      
      Change-Id: I871d7cba1d1c379c4bad9bcccce1fb19c46b8247
      2d60bee1
  10. 21 Aug, 2012 1 commit
  11. 20 Aug, 2012 1 commit
    • Ronald S. Bultje's avatar
      Superblock coding. · 5d4cffb3
      Ronald S. Bultje authored
      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%.
      
      Change-Id: Iae313a7cbd8f75b3c66d04a68b991cb096eaaba6
      5d4cffb3
  12. 15 Aug, 2012 1 commit
    • Paul Wilkins's avatar
      Code clean up. · 77dc5c65
      Paul Wilkins authored
      Further cases of inconsistent naming convention.
      
      Change-Id: Id3411ecec6f01a4c889268a00f0c9fd5a92ea143
      77dc5c65
  13. 14 Aug, 2012 1 commit
  14. 10 Aug, 2012 1 commit
  15. 07 Aug, 2012 1 commit
    • Yaowu Xu's avatar
      a new way of determining reference motion vector · 8b2f57d0
      Yaowu Xu authored
      Using surrounding reconstructed pixels from left and above to select
      best matching mv to use as reference motion vector for mv encoding.
      
      Test results:
             AVGPSNR  GLBPSNR VPXSSIM
      Derf:  1.107%   1.062%  0.992%
      Std-hd:1.209%   1.176%  1.029%
      
      Change-Id: I8f10e09ee6538c05df2fb9f069abcaf1edb3fca6
      8b2f57d0
  16. 03 Aug, 2012 3 commits
    • 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
    • Jingning Han's avatar
      Replacing the 8x8 DCT with 8x8 ADST/DCT for I8x8 · fcbff9ee
      Jingning Han authored
      Fixed the code review comments.
      
      Under the htrans8x8 experiment the 8X8 DCT in the
      I8X8 mode is replaced with a combination of 8X8 ADST and
      DCT.
      
      Overall coding gains with the htrans8x8 experiment are:
      derf:   0.486
      std-hd: 1.040
      hd:     1.063
      yt:     0.506
      
      Note that part of the gain comes from bigger transforms
      (8x8 instead of 4x4) and part comes from replacing the DCT
      wth the ADST.
      
      Change-Id: I92ca6bbfce11b4165d612b81d9adfad4d010c775
      fcbff9ee
    • Daniel Kang's avatar
      16x16 DCT blocks. · fed8a183
      Daniel Kang authored
      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
      
      Have not tested with experiments.
      
      hd:     2.60%
      std-hd: 2.43%
      yt:     1.32%
      derf:   0.60%
      
      Change-Id: I96fb090517c30c5da84bad4fae602c3ec0c58b1c
      fed8a183
  17. 31 Jul, 2012 1 commit
    • Deb Mukherjee's avatar
      Merging and bug-fix in enhanced_interp experiment · 0ebf548c
      Deb Mukherjee authored
      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.
      
      The results are more or less unchanged.
      
      Change-Id: Iac5008390f1efc97ce1102fbb5f8989c847fb579
      0ebf548c
  18. 30 Jul, 2012 1 commit
    • Deb Mukherjee's avatar
      Adds support for switchable interpolation filters. · 52597441
      Deb Mukherjee authored
      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.
      
      Rebased.
      
      Change-Id: I8f632cb2c111e76284140a2bd480945d6d42b77a
      52597441
  19. 27 Jul, 2012 1 commit
    • Deb Mukherjee's avatar
      Merges several experiments · 9984a155
      Deb Mukherjee authored
      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
      
      Change-Id: I8a142a831786ee9dc936f22be1d42a8bced7d270
      9984a155
  20. 19 Jul, 2012 1 commit
    • Jingning Han's avatar
      Adds hybrid transform · 9824230f
      Jingning Han authored
      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%
      
      Will be looking at 8x8 transforms next.
      
      Change-Id: I46dbd7b80dbb3e8856e9c34fbc58cb3764a12fcf
      9824230f
  21. 17 Jul, 2012 1 commit
  22. 27 Jun, 2012 1 commit
    • Adrian Grange's avatar
      Added Prediction Filter to Mode Selection · bbc926dc
      Adrian Grange authored
      Added the ability to optionally filter the prediction data
      when inter modes are selected (excludes SPLITMV, for now).
      
      The mode selection loop considers both the filtered and
      non-filtered prediction data when choosing mode. The filter
      can be turned on/off at the frame-level, or signaled for
      each MB.
      
      Change-Id: I1b783c71d95a361ab36c761b07e8a6b06bc36822
      bbc926dc
  23. 15 May, 2012 1 commit
  24. 04 May, 2012 1 commit
  25. 18 Apr, 2012 1 commit
  26. 11 Apr, 2012 1 commit
    • Adrian Grange's avatar
      Superblock encoding order · 9daf3154
      Adrian Grange authored
      This is the first patch to add superblock (32x32) coding
      order capabilities. It does not yet do any mode selection
      at the SB level, that will follow in a further patch.
      
      This patch encodes rows of SBs rather than
      MBs, each SB contains 2x2 MBs.
      
      Two intra prediction modes have been disabled since they
      require reconstructed data for the above-right MB which
      may not have been encoded yet (e.g. for the bottom right
      MB in each SB).
      
      Results on the one test clip I have tried (720p GIPS clip)
      suggest that it is somewhere around 0.2dB worse than the
      baseline version, so there may be bugs.
      
      It has been tested with no experiments enabled and with
      the following 3 experiments enabled:
        --enable-enhanced_interp
        --enable-high_precision_mv
        --enable-sixteenth_subpel_uv
      in each case the decode buffer matches the recon buffer
      (using "cmp" to compare the dumped/decoded frames).
      Note: Testing these experiments individually created
      errors.
      
      Some problems were found with other experiments but it
      is unclear what state these experiments are in:
        --enable-comp_intra_pred
        --enable-newentropy
        --enable-uvintra
      
      This code has not been extensively tested yet, so there
      is every likelihood that further bugs remain. I also
      intend to do some code cleanup & refactoring in tandem
      with the next patch that adds the 32x32 modes.
      
      Change-Id: I1eba7f740a70b3510df58db53464535ef881b4d9
      9daf3154
  27. 21 Mar, 2012 1 commit
  28. 15 Mar, 2012 3 commits
    • Yaowu Xu's avatar
      added clamp for 2nd motion vector · 8055ccf9
      Yaowu Xu authored
      The commit added a clamp to the 2nd motion vector used in compound
      prediction to insure mv within UMV borders. The clamp is similar to
      that of the first motion vector except that No SPLITMV is ever used
      for the 2nd motion vector.
      
      Change-Id: I26dd63c304bd66b2e03a083749cc98c641667116
      8055ccf9
    • 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
    • Yaowu Xu's avatar
      added clamp for 2nd motion vector · 21d3612a
      Yaowu Xu authored
      The commit added a clamp to the 2nd motion vector used in compound
      prediction to insure mv within UMV borders. The clamp is similar to
      that of the first motion vector except that No SPLITMV is ever used
      for the 2nd motion vector.
      
      Change-Id: I26dd63c304bd66b2e03a083749cc98c641667116
      21d3612a
  29. 01 Mar, 2012 1 commit
  30. 29 Feb, 2012 1 commit
  31. 27 Feb, 2012 1 commit
    • Paul Wilkins's avatar
      Corrected spelling · b00ed02a
      Paul Wilkins authored
      Apparently the correct spelling of segement is segment !
      
      Change-Id: I88593ee0523f251b3a96794c6166ef8c7898a029
      b00ed02a
  32. 24 Feb, 2012 1 commit
  33. 23 Feb, 2012 1 commit
    • Deb Mukherjee's avatar
      Supporting high precision 1/8-pel motion vectors · 18e90d74
      Deb Mukherjee authored
      This is the initial patch for supporting 1/8th pel
      motion. Currently if we configure with enable-high-precision-mv,
      all motion vectors would default to 1/8 pel. Encode and
      decode syncs fine with the current code. In the next phase
      the code will be refactored so that we can choose the 1/8
      pel mode adaptively at a frame/segment/mb level.
      
      Derf results:
      http://www.corp.google.com/~debargha/vp8_results/enhinterp_hpmv.html
      (about 0.83% better than 8-tap interpoaltion)
      
      Patch 3: Rebased. Also adding 1/16th pel interpolation for U and V
      
      Patch 4: HD results.
      http://www.corp.google.com/~debargha/vp8_results/enhinterp_hd_hpmv.html
      Seems impressive (unless I am doing something wrong).
      
      Patch 5: Added mmx/sse for bilateral filtering, as well as enforced
      use of c-versions of subpel filters with 8-taps and 1/16th pel;
      Also redesigned the 8-tap filters to reduce the cut-off in order to
      introduce a denoising effect. There is a new configure option
      sixteenth-subpel-uv which will use 1/16 th pel interpolation for
      uv, if the motion vectors have 1/8 pel accuracy.
      
      With the fixes the results are promising on the derf set. The enhanced
      interpolation option with 8-taps alone gives 3% improvement over thei
      derf set:
      http://www.corp.google.com/~debargha/vp8_results/enhinterpn.html
      
      Results on high precision mv and on the hd set are to follow.
      
      Patch 6: Adding a missing condition for CONFIG_SIXTEENTH_SUBPEL_UV in
      vp8/common/x86/x86_systemdependent.c
      
      Patch 7: Cleaning up various debug messages.
      
      Patch 8: Merge conflict
      
      Change-Id: I5b1d844457aefd7414a9e4e0e06c6ed38fd8cc04
      18e90d74
  34. 16 Feb, 2012 2 commits
    • Yaowu Xu's avatar
      a bit code clean-up · 47d545f1
      Yaowu Xu authored
      Removed some transform code that is not in use.
      
      Change-Id: I9489af7e23d9d7fe052feb6c8bbafa62ebbda39c
      47d545f1
    • Yaowu Xu's avatar
      Reworked context conversion between 8x8 and 4x4 · b92a96d8
      Yaowu Xu authored
      The commit rationized and simplified the entropy context conversion
      betwen MB using 8x8 transform and MB using 4x4 transform. The old version
      had a number of weirdness in how 4x4 transform MB's context is used for
      8x8 blocks other than the first 8x8 within a MB.
      
      Test showed the change has a gain ~.1% for avg psnr, glb psnr and ssim on
      the limited HD set.
      
      Change-Id: I774536c416baa6845aa741f956d8a69fa40e5d47
      b92a96d8