1. 26 Mar, 2013 1 commit
    • Deb Mukherjee's avatar
      Modeling default coef probs with distribution · fd18d5df
      Deb Mukherjee authored
      Replaces the default tables for single coefficient magnitudes with
      those obtained from an appropriate distribution. The EOB node
      is left unchanged. The model is represeted as a 256-size codebook
      where the index corresponds to the probability of the Zero or the
      One node. Two variations are implemented corresponding to whether
      the Zero node or the One-node is used as the peg. The main advantage
      is that the default prob tables will become considerably smaller and
      manageable. Besides there is substantially less risk of over-fitting
      for a training set.
      
      Various distributions are tried and the one that gives the best
      results is the family of Generalized Gaussian distributions with
      shape parameter 0.75. The results are within about 0.2% of fully
      trained tables for the Zero peg variant, and within 0.1% of the
      One peg variant.
      
      The forward updates are optionally (controlled by a macro)
      model-based, i.e. restricted to only convey probabilities from the
      codebook. Backward updates can also be optionally (controlled by
      another macro) model-based, but is turned off by default. Currently
      model-based forward updates work about the same as unconstrained
      updates, but there is a drop in performance with backward-updates
      being model based.
      
      The model based approach also allows the probabilities for the key
      frames to be adjusted from the defaults based on the base_qindex of
      the frame. Currently the adjustment function is a placeholder that
      adjusts the prob of EOB and Zero node from the nominal one at higher
      quality (lower qindex) or lower quality (higher qindex) ends of the
      range. The rest of the probabilities are then derived based on the
      model from the adjusted prob of zero.
      
      Change-Id: Iae050f3cbcc6d8b3f204e8dc395ae47b3b2192c9
      fd18d5df
  2. 19 Mar, 2013 1 commit
  3. 18 Mar, 2013 15 commits
  4. 17 Mar, 2013 1 commit
  5. 16 Mar, 2013 4 commits
  6. 15 Mar, 2013 4 commits
  7. 14 Mar, 2013 5 commits
    • Dmitry Kovalev's avatar
      Cleaning up frame decoding functionality. · 9285703e
      Dmitry Kovalev authored
      Change-Id: I25424904fb8541fc19d00d9fbc592379374b98c0
      9285703e
    • Yaowu Xu's avatar
      force lossless coding at very high quality end · 374a1736
      Yaowu Xu authored
      Change-Id: I75fc4eee10bee9efd419d248827290cce8e6d637
      374a1736
    • Yaowu Xu's avatar
      Remove leftover reference to 2nd order dc/ac quant · f4d2ad69
      Yaowu Xu authored
      Change-Id: Ib8dacf1d2797743569771b8f699e40e1aeb085cb
      f4d2ad69
    • John Koleszar's avatar
      Fix pulsing issue with scaling · 9b7be888
      John Koleszar authored
      Updates the YV12_BUFFER_CONFIG structure to be crop-aware. The
      exiting width/height parameters are left unchanged, storing the
      width and height algined to a 16 byte boundary. The cropped
      dimensions are added as new fields.
      
      This fixes a nasty visual pulse when switching between scaled and
      unscaled frame dimensions due to a mismatch between the scaling
      ratio and the 16-byte aligned sizes.
      
      Change-Id: Id4a3f6aea6b9b9ae38bdfa1b87b7eb2cfcdd57b6
      9b7be888
    • John Koleszar's avatar
      Add VP9_GET_REFERENCE control · b3c350a1
      John Koleszar authored
      This is like VP8_COPY_REFERENCE, but returns a pointer to the reference
      frame rather than a copy of it. This is useful when the application
      doesn't know what the size of the reference is, as is the case when
      scaling is in effect.
      
      Change-Id: I63667109f65510364d0e397ebe56217140772085
      b3c350a1
  8. 13 Mar, 2013 4 commits
    • 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
    • Yaowu Xu's avatar
      put refmvselection under experiment · 88862c04
      Yaowu Xu authored
      and turn the experiment off by default.
      
      Change-Id: If9e684aa6cc49eacd39f36645a110a447e38d2de
      88862c04
    • Yaowu Xu's avatar
      removed reference to "LLM" and "x8" · 00555263
      Yaowu Xu authored
      The commit changed the name of files and function to remove obselete
      reference to LLM and x8.
      
      Change-Id: I973b20fc1a55149ed68b5408b3874768e6f88516
      00555263
    • John Koleszar's avatar
      fix superframe index marker masks · bd9cd9a1
      John Koleszar authored
      The superframe index marker byte carries data in the lower 5 bits. Only the
      upper 3 should be used as part of the mask to detect it. By masking with
      0xf0, the previous code was incorrect for frames over 65k bytes.
      
      Change-Id: I6248889f5af227457f359a56b2348ef6db87a3b4
      bd9cd9a1
  9. 12 Mar, 2013 5 commits