1. 26 Mar, 2013 2 commits
    • Ronald S. Bultje's avatar
      Add col/row-based coefficient scanning patterns for 1D 8x8/16x16 ADSTs. · d9094d8f
      Ronald S. Bultje authored
      These are mostly just for experimental purposes. I saw small gains (in
      the 0.1% range) when playing with this on derf.
      
      Change-Id: Ib21eed477bbb46bddcd73b21c5c708a5b46abedc
      d9094d8f
    • 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. 07 Mar, 2013 3 commits
    • Dmitry Kovalev's avatar
      Consistent usage of ROUND_POWER_OF_TWO macro. · 3603dfb6
      Dmitry Kovalev authored
      Change-Id: I44660975e9985310d8c654c158ee7a61291b5a08
      3603dfb6
    • Ronald S. Bultje's avatar
      Re-add support for ADST in superblocks. · d3724abe
      Ronald S. Bultje authored
      This also changes the RD search to take account of the correct block
      index when searching (this is required for ADST positioning to work
      correctly in combination with tx_select).
      
      Change-Id: Ie50d05b3a024a64ecd0b376887aa38ac5f7b6af6
      d3724abe
    • Deb Mukherjee's avatar
      Coding con-zero count rather than EOB for coeffs · eb6ef241
      Deb Mukherjee authored
      This patch revamps the entropy coding of coefficients to code first
      a non-zero count per coded block and correspondingly remove the EOB
      token from the token set.
      
      STATUS:
      Main encode/decode code achieving encode/decode sync - done.
      Forward and backward probability updates to the nzcs - done.
      Rd costing updates for nzcs - done.
      Note: The dynamic progrmaming apporach used in trellis quantization
      is not exactly compatible with nzcs. A suboptimal approach has been
      used instead where branch costs are updated to account for changes
      in the nzcs.
      
      TODO:
      Training the default probs/counts for nzcs
      
      Change-Id: I951bc1e22f47885077a7453a09b0493daa77883d
      eb6ef241
  3. 05 Mar, 2013 1 commit
    • Ronald S. Bultje's avatar
      Make superblocks independent of macroblock code and data. · 111ca421
      Ronald S. Bultje authored
      Split macroblock and superblock tokenization and detokenization
      functions and coefficient-related data structs so that the bitstream
      layout and related code of superblock coefficients looks less like it's
      a hack to fit macroblocks in superblocks.
      
      In addition, unify chroma transform size selection from luma transform
      size (i.e. always use the same size, as long as it fits the predictor);
      in practice, this means 32x32 and 64x64 superblocks using the 16x16 luma
      transform will now use the 16x16 (instead of the 8x8) chroma transform,
      and 64x64 superblocks using the 32x32 luma transform will now use the
      32x32 (instead of the 16x16) chroma transform.
      
      Lastly, add a trellis optimize function for 32x32 transform blocks.
      
      HD gains about 0.3%, STDHD about 0.15% and derf about 0.1%. There's
      a few negative points here and there that I might want to analyze
      a little closer.
      
      Change-Id: Ibad7c3ddfe1acfc52771dfc27c03e9783e054430
      111ca421
  4. 27 Feb, 2013 1 commit
  5. 22 Feb, 2013 1 commit
    • Paul Wilkins's avatar
      Experimental removal of over quant code · dbf49420
      Paul Wilkins authored
      The over quant code was added in VP8 post
      bitstream freeze to allow compression to lower
      data rates
      
      In VP9 the real qualtizer range has been greatly
      extended anyway.
      
      Change-Id: I5d384fa5e9a83ef75a3df34ee30627bd21901526
      dbf49420
  6. 19 Feb, 2013 1 commit
    • Yaowu Xu's avatar
      Use lossless for Q0 · 93d6b86c
      Yaowu Xu authored
      The commit changes the coding mode to lossless whenever the lowest
      quantizer is choosen.
      
      As expected, test results showed no difference for cif and std-hd
      set where Q0 is rarely used. For yt and yt-hd set, Q0 is used for
      a number of clips, where this commit helped a lot in the high end.
      
      Average over all clips in the sets:
      yt: 2.391% 1.017% 1.066%
      hd: 1.937%  .764%  .787%
      
      Change-Id: I9fa9df8646fd70cb09ffe9e4202b86b67da16765
      93d6b86c
  7. 15 Feb, 2013 2 commits
  8. 13 Feb, 2013 2 commits
    • Paul Wilkins's avatar
      Fixed encoder decoder mismatch. · 56049d94
      Paul Wilkins authored
      Reverted part of change
      I19981d1ef0b33e4e5732739574f367fe82771a84
      
      That gives rise to an enc/dec mismatch.
      As things stand the memsets are still needed.
      
      Change-Id: I9fa076a703909aa0c4da0059ac6ae19aa530db30
      56049d94
    • Yaowu Xu's avatar
      enable bitstream lossless support · 17db5d00
      Yaowu Xu authored
      1. Added a bit in frame header to  to indicate if a frame is encoded
      in lossless mode, so decoder does not make the decision based on Q0
      2. Minor changes to make sure that lossy coding works same as when
      the lossless experiment is not enabled.
      3. Renamed function pointers for transforms to be consistent, using
      prefix fwd_txm and inv_txm for forward and inverse respectively
      
      To encode in lossless mode, using "--lossless=1 --min-q=0 --max-q=0"
      with vpxenc.
      
      Change-Id: Ifae53b26d2ffbe378d707e29d96817b8a5e6c068
      17db5d00
  9. 12 Feb, 2013 1 commit
    • Christian Duvivier's avatar
      Faster vp9_regular_quantize_b_8x8. · 0e4397f0
      Christian Duvivier authored
      A couple of scalar optimizations speeding up quantization by about 1.6x. Overall encoder speedup is around 3%.
      
      Change-Id: I19981d1ef0b33e4e5732739574f367fe82771a84
      0e4397f0
  10. 29 Jan, 2013 1 commit
    • Paul Wilkins's avatar
      Remove eob_max_offset markers. · 93762ca9
      Paul Wilkins authored
      Remove eob_max_offset markers and replace
      with the generic skip_block flag to indicate
      to the quantizer that all coeffs to be set to 0
      and eob position set to 0;
      
      Change-Id: Id477e8f8d4ec1a5562758904071013c24b76bfd7
      93762ca9
  11. 28 Jan, 2013 2 commits
    • Paul Wilkins's avatar
      Segment Skip Flag · 0ff9b033
      Paul Wilkins authored
      First step in simplifying the segment mode and
      segment EOB flags into a simpler segment skip
      flag that implies 0,0 mv and EOB at position 0.
      
      Change-Id: Ib750cac31a7a02dc21082580498efd9f7d8d72a5
      0ff9b033
    • Paul Wilkins's avatar
      Simplify Zero bin and zero bin run code. · 8e2c03fb
      Paul Wilkins authored
      Simplification to eliminate a number of very large data
      data structures. All zero run, zbin boosts for different
      transform sizes are now limited to a maximum run length
      of 15 before they max out the boost.
      
      Some further work still needs be done to refactor, rationalize
      and optimize the multiple quantizer functions.
      
      The simplification coupled with tweaks to the 16 element array
      now used for all transform sizes, has minimal effect on quality.
      
      Change-Id: I6f3948b8ca0418b60d4db9030ff19026a34ed423
      8e2c03fb
  12. 10 Jan, 2013 1 commit
  13. 08 Jan, 2013 1 commit
  14. 18 Dec, 2012 2 commits
  15. 07 Dec, 2012 1 commit
    • Ronald S. Bultje's avatar
      32x32 transform for superblocks. · c456b35f
      Ronald S. Bultje authored
      This adds Debargha's DCT/DWT hybrid and a regular 32x32 DCT, and adds
      code all over the place to wrap that in the bitstream/encoder/decoder/RD.
      
      Some implementation notes (these probably need careful review):
      - token range is extended by 1 bit, since the value range out of this
        transform is [-16384,16383].
      - the coefficients coming out of the FDCT are manually scaled back by
        1 bit, or else they won't fit in int16_t (they are 17 bits). Because
        of this, the RD error scoring does not right-shift the MSE score by
        two (unlike for 4x4/8x8/16x16).
      - to compensate for this loss in precision, the quantizer is halved
        also. This is currently a little hacky.
      - FDCT and IDCT is double-only right now. Needs a fixed-point impl.
      - There are no default probabilities for the 32x32 transform yet; I'm
        simply using the 16x16 luma ones. A future commit will add newly
        generated probabilities for all transforms.
      - No ADST version. I don't think we'll add one for this level; if an
        ADST is desired, transform-size selection can scale back to 16x16
        or lower, and use an ADST at that level.
      
      Additional notes specific to Debargha's DWT/DCT hybrid:
      - coefficient scale is different for the top/left 16x16 (DCT-over-DWT)
        block than for the rest (DWT pixel differences) of the block. Therefore,
        RD error scoring isn't easily scalable between coefficient and pixel
        domain. Thus, unfortunately, we need to compute the RD distortion in
        the pixel domain until we figure out how to scale these appropriately.
      
      Change-Id: I00386f20f35d7fabb19aba94c8162f8aee64ef2b
      c456b35f
  16. 29 Nov, 2012 1 commit
    • Deb Mukherjee's avatar
      Fixing 8x8/4x4 ADST for intra modes with tx select · 0742b1e4
      Deb Mukherjee authored
      This patch allows use of 8x8 and 4x4 ADST correctly for Intra
      16x16 modes and Intra 8x8 modes when the block size selected
      is smaller than the prediction mode. Also includes some cleanups
      and refactoring.
      
      Rebase.
      
      Change-Id: Ie3257bdf07bdb9c6e9476915e3a80183c8fa005a
      0742b1e4
  17. 28 Nov, 2012 1 commit
  18. 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
  19. 01 Nov, 2012 1 commit
  20. 31 Oct, 2012 5 commits
  21. 30 Oct, 2012 1 commit
  22. 22 Oct, 2012 1 commit
  23. 19 Oct, 2012 1 commit
    • Deb Mukherjee's avatar
      Some cleanups and fixes. · f3208f36
      Deb Mukherjee authored
      Separates the logic on transform type selection previously spread out
      over a number of files into a separate function. Currently the tx_type
      field in b_mode_info is not used, but still left in there to eventually
      use for signaling the transform type in the bitstream.
      
      Also, now for tx_type = DCT_DCT, the regular integer DCT is used, as
      opposed to the floating point DCT used in conjuction with hybrid
      transform.
      
      Results change somewhat due to the transform change, but are within
      reasonable limits. The hd/std-hd sets are slightly up, while derf/yt
      are slightly down.
      
      Change-Id: I5776840c2239ca2da31ca6cfd7fd1148dc5f9e0f
      f3208f36
  24. 14 Oct, 2012 2 commits
  25. 11 Oct, 2012 1 commit
  26. 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
  27. 03 Aug, 2012 1 commit
    • 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
  28. 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