1. 29 Jun, 2012 3 commits
    • Christian Duvivier's avatar
      Get rid of some cast. · 5a5ced3e
      Christian Duvivier authored
      Change-Id: Iff5ccf2400bcb7b78c7b70f289ea65c982efddd5
      5a5ced3e
    • Christian Duvivier's avatar
      Fix warnings. · c5b70370
      Christian Duvivier authored
      Change-Id: I6dd27a0ea661e6f10a55d7841021b66ae4fc72ae
      c5b70370
    • Hui Su's avatar
      Add lossless compression mode. · e44ee38a
      Hui Su authored
      This commit adds lossless compression capability to the experimental
      branch. The lossless experiment can be enabled using --enable-lossless
      in configure. When the experiment is enabled, the encoder will use
      lossless compression mode by command line option --lossless, and the
      decoder automatically recognizes a losslessly encoded clip and decodes
      accordingly.
      
      To achieve the lossless coding, this commit has changed the following:
          1. To encode at lossless mode, encoder forces the use of unit
      quantizer, i.e, Q 0, where effective quantization is 1. Encoder also
      disables the usage of 8x8 transform and allows only 4x4 transform;
          2. At Q 0, the first order 4x4  DCT/IDCT have been switched over
      to a pair of forward and inverse Walsh-Hadamard Transform
      (http://goo.gl/EIsfy),  with proper scaling applied to match the range
      of the original 4x4 DCT/IDCT pair;
          3. At Q 0, the second order remains to use the previous
      walsh-hadamard transform pair. However, to maintain the reversibility
      in second order transform at Q 0, scaling down is applied to first
      order DC coefficients prior to forward transform, and scaling up is
      applied to the second order output prior to quantization. Symmetric
      upscaling and downscaling are added around inverse second order
      transform;
          4. At lossless mode, encoder also disables a number of minor
      features to ensure no loss is introduced, these features includes:
              a. Trellis quantization optimization
              b. Loop filtering
              c. Aggressive zero-binning, rounding and zero-bin boosting
              d. Mode based zero-bin boosting
      
      Lossless coding test was performed on all clips within the derf set,
      to verify that the commit has achieved lossless compression for all
      clips. The average compression ratio is around 2.57 to 1.
      (http://goo.gl/dEShs)
      
      Change-Id: Ia3aba7dd09df40dd590f93b9aba134defbc64e34
      e44ee38a
  2. 28 Jun, 2012 2 commits
  3. 27 Jun, 2012 2 commits
  4. 26 Jun, 2012 3 commits
  5. 25 Jun, 2012 1 commit
  6. 20 Jun, 2012 3 commits
  7. 19 Jun, 2012 3 commits
  8. 18 Jun, 2012 4 commits
  9. 15 Jun, 2012 2 commits
    • Deb Mukherjee's avatar
      Adaptive entropy coding of coefficients, modes, mv. · 1fe85a35
      Deb Mukherjee authored
      This patch incorporates adaptive entropy coding of coefficient tokens,
      and mode/mv information based on distributions encountered in a frame.
      Specifically, there is an initial forward update to the probabilities
      in the bitstream as before for coding the symbols in the frame, however
      at the end of decoding each frame, the forward update to the
      probabilities is reverted and instead the probabilities are updated
      towards the actual distributions encountered within the frame.
      The amount of update is weighted by the number of hits within each
      context.
      
      Results on derf/hd/std-hd are all up by 1.6%.
      
      On derf, the most of the gains come from coefficients, however for the
      hd and std-hd sets, the most of the gains come from the mode/mv
      information updates.
      
      Change-Id: I708c0e11fdacafee04940fe7ae159ba6844005fd
      1fe85a35
    • Daniel Kang's avatar
  10. 12 Jun, 2012 6 commits
    • Daniel Kang's avatar
      Adds x86inc.asm and update idct/dequant mmx · 7a000715
      Daniel Kang authored
      Updates idct/dequant mmx assembly to work with vpnext instead of vp8.
      
      Also adds x86inc.asm
      
      Change-Id: I6e147d5e89177ae449271e97e50d082eb11b078e
      7a000715
    • Yaowu Xu's avatar
      changed to use a fixed number for update probabity · 074a38b1
      Yaowu Xu authored
      This commit is to remove two arrays, which contain the probabilities
      of how likely each probability in coef_probs table is updated. The
      commit changed to use a fixed number "252".
      
      Surprisedly, the overall impact on quality is close to zero, which
      basically says the two big static arrays are not helpful at all.
      derf: -0.016%, -0.020%
      std-hd: 0.000%, -0.013%
      yt: -0.022%, +0.007%
      yt-hd: -0.038%, +0.034%
      
      Change-Id: Ifee94d28a37dcab4f1d2b994bd5b07575be42b72
      074a38b1
    • Yaowu Xu's avatar
      Added the ability to accumulate coef stats across encodings · bb25083d
      Yaowu Xu authored
      This commit added the ability to accumulate the coef stats across
      different encodings using an intermediate binary stats files. The
      accumulation happens only the binary stats file exists in current
      directory. The encoder needs to be built with "ENTROPY_STATS" to
      allow the output. The commit also fixed a few formating issues in
      output stats file.
      
      Change-Id: Ib1a41180aa554845cf51e4421a230b128a3a82b4
      bb25083d
    • Paul Wilkins's avatar
    • Paul Wilkins's avatar
    • Paul Wilkins's avatar
      Merge of further two pass rc clean up and adjustments. · 7eb66d82
      Paul Wilkins authored
      Changes to calculation of  sr_coded_error to include 0,0 case.
      
      Experimental use of sr_coded_error in calculating correction factor
      for estimating the allowable Q range.
      
      Reinstated some code needed for calculating section_intra_rating.
      
      Add flash detection in calculation of KF boost
      
      Increased tolerance in testing candidate key frames (needed with
      longer motion search as this tends to slightly increase inter %.
      
      Zbin changes for 8x8.
      
      Other minor adjustments, refactoring and bug fixes.
      
      Reinstated some motion break out clauses in boost loop
      as their removal hurt a few 50fps  clips badly in the std set.
      It may be possible to remove them again later if a better way
      can be found of preventing overly long gf intervals.
      
      Change-Id: Iee686d0c31072828bb1ccd2bc63f5f1c7c548ea2
      7eb66d82
  11. 08 Jun, 2012 1 commit
    • Paul Wilkins's avatar
      Key frame and GF sizing changes. · 0cb4985b
      Paul Wilkins authored
      Changes to the equations for kf and gf minQ and to
      the boost calculations for kg and gf
      
      Change-Id: I312031c910e6a575334f49075c32f49a8dfff239
      0cb4985b
  12. 31 May, 2012 1 commit
    • Adrian Grange's avatar
      Fixed bug where invalid pointer is dereferenced · 04fa2ecd
      Adrian Grange authored
      Variables m & mi were being dereferenced when they might
      hold invalid values.
      
      The fix is simply to move these dereferences to after the
      point at which mb_row and mb_col are tested for validity.
      
      Change-Id: Ib16561efa9792dc469759936189ea379d374ad20
      04fa2ecd
  13. 30 May, 2012 1 commit
    • Paul Wilkins's avatar
      Rate control fix. · b8c36905
      Paul Wilkins authored
      This fix addresses some problems with very complex clips like
      handling of flashes on clips like crew (which was made worse
      by an earlier patch (derf and std-hd)).
      
      Most clips a small effect but some between 1 & 2%
      
      Derf +0.039, +0.211%
      YT +0.042, +0.083%
      
      Change-Id: I65fc7c13afc31482040068544dd65b8808f5cb4a
      b8c36905
  14. 29 May, 2012 2 commits
  15. 26 May, 2012 1 commit
    • Yaowu Xu's avatar
      fixed one more compiling issue with VC · 2722cfb4
      Yaowu Xu authored
      One more compiling issue, only happened in Visual C under a specific
      combination of experiments.
      
      Change-Id: Iba0775dc0ea7342b556348a9cdf60a05a59e0241
      2722cfb4
  16. 25 May, 2012 2 commits
  17. 23 May, 2012 1 commit
    • Yaowu Xu's avatar
      changed the way that default probs for 8x8 is set. · e9818bb6
      Yaowu Xu authored
      The commit changed how baseline 8x8 coefficient probabilities are
      initialized, to be consistent with the initialization of baseline
      4x4 coefficient probabilities.
      
      The commit does not have any effect on compression.
      
      Change-Id: Ifb3902b5dc0b0c2e6dc3aa5d4a6589d528e58355
      e9818bb6
  18. 18 May, 2012 1 commit
  19. 17 May, 2012 1 commit
    • Paul Wilkins's avatar
      Experimental change to two pass prediction decay calculation. · f63894f6
      Paul Wilkins authored
      Remove dependency on amount and speed of motion as this
      may not behave well across different image sizes.
      
      Tweak impact of % inter.
      
      Add in experimental adjustment based on relative quality of an
      older second reference frame.
      
      Cap range of decay values allowed.
      
      Some small + effect on derf but -ve on yt & hd at this stage.
      
      Change-Id: I390d6f6ebe67a2eb0b834980d0d4650124980d3e
      f63894f6