1. 12 Feb, 2013 1 commit
  2. 08 Feb, 2013 2 commits
    • John Koleszar's avatar
      Initial support for resolution changes on P-frames · 393b4856
      John Koleszar authored
      Allows inter-frames to change resolution. Currently these are
      almost equivalent to keyframes, as only intra prediction modes
      are allowed, but without the other context resets that occur on
      keyframes.
      
      Change-Id: Icd1a2a5af0d9462cc792588427b0a1f5b12e40d3
      393b4856
    • Paul Wilkins's avatar
      Nearest / Zero Mv default entropy tweak. · bbede82f
      Paul Wilkins authored
      Tweak to default mode context to account for the fact
      that when there are no non zero motion candidates
      Nearest is now the preferred mode for coding a 0,0
      vector.
      
      Also resolve duplicate function name and typos.
      
      Change-Id: I76802788d46c84e3d1c771be216a537ab7b12817
      bbede82f
  3. 06 Feb, 2013 1 commit
  4. 05 Feb, 2013 1 commit
    • Ronald S. Bultje's avatar
      [WIP] Add column-based tiling. · 1407bdc2
      Ronald S. Bultje authored
      This patch adds column-based tiling. The idea is to make each tile
      independently decodable (after reading the common frame header) and
      also independendly encodable (minus within-frame cost adjustments in
      the RD loop) to speed-up hardware & software en/decoders if they used
      multi-threading. Column-based tiling has the added advantage (over
      other tiling methods) that it minimizes realtime use-case latency,
      since all threads can start encoding data as soon as the first SB-row
      worth of data is available to the encoder.
      
      There is some test code that does random tile ordering in the decoder,
      to confirm that each tile is indeed independently decodable from other
      tiles in the same frame. At tile edges, all contexts assume default
      values (i.e. 0, 0 motion vector, no coefficients, DC intra4x4 mode),
      and motion vector search and ordering do not cross tiles in the same
      frame.
      t log
      
      Tile independence is not maintained between frames ATM, i.e. tile 0 of
      frame 1 is free to use motion vectors that point into any tile of frame
      0. We support 1 (i.e. no tiling), 2 or 4 column-tiles.
      
      The loopfilter crosses tile boundaries. I discussed this briefly with Aki
      and he says that's OK. An in-loop loopfilter would need to do some sync
      between tile threads, but that shouldn't be a big issue.
      
      Resuls: with tiling disabled, we go up slightly because of improved edge
      use in the intra4x4 prediction. With 2 tiles, we lose about ~1% on derf,
      ~0.35% on HD and ~0.55% on STD/HD. With 4 tiles, we lose another ~1.5%
      on derf ~0.77% on HD and ~0.85% on STD/HD. Most of this loss is
      concentrated in the low-bitrate end of clips, and most of it is because
      of the loss of edges at tile boundaries and the resulting loss of intra
      predictors.
      
      TODO:
      - more tiles (perhaps allow row-based tiling also, and max. 8 tiles)?
      - maybe optionally (for EC purposes), motion vectors themselves
        should not cross tile edges, or we should emulate such borders as
        if they were off-frame, to limit error propagation to within one
        tile only. This doesn't have to be the default behaviour but could
        be an optional bitstream flag.
      
      Change-Id: I5951c3a0742a767b20bc9fb5af685d9892c2c96f
      1407bdc2
  5. 30 Jan, 2013 1 commit
  6. 28 Jan, 2013 1 commit
    • 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
  7. 26 Jan, 2013 1 commit
    • Deb Mukherjee's avatar
      Adding a frame parallel decoding mode · dfd89f2e
      Deb Mukherjee authored
      Adds a flag to disable features that would inhibit frame parallel
      decoding. This includes backward adaptation and MV sorting based
      on search in ref frame buffer.
      
      Also includes some minor clean-ups.
      
      Change-Id: I434846717a47b7bcb244b37ea670c5cdf776f14d
      dfd89f2e
  8. 24 Jan, 2013 1 commit
    • Deb Mukherjee's avatar
      Adds an error-resilient mode with test · 01cafaab
      Deb Mukherjee authored
      Adds an error-resilient mode where frames can be continued
      to be decoded even when there are errors (due to network losses)
      on a prior frame. Specifically, backward updates are turned off
      and probabilities of various symbols are reset to defaults at
      the beginning of each frame. Further, the last frame's mvs are
      not used for the mv reference list, and the sorting of the
      initial list based on search on previous frames is turned off
      as well.
      
      Also adds a test where an arbitrary set of frames are skipped
      from decoding to simulate errors. The test verifies (1) that if
      the error frames are droppable - i.e. frame buffer updates have
      been turned off - there are no mismatch errors for the remaining
      frames after the error frames; and (2) if the error-frames are non
      droppable, there are not only no decoding errors but the mismatch
      PSNR between the decoder's version of the post-error frames and the
      encoder's version is at least 20 dB.
      
      Change-Id: Ie6e2bcd436b1e8643270356d3a930e8989ff52a5
      01cafaab
  9. 16 Jan, 2013 4 commits
    • John Koleszar's avatar
      Preserve the previous golden frame on golden updates · 26bd81b9
      John Koleszar authored
      This commit restores the quality lost when the buffer-to-buffer copy
      logic was removed. Note that this is specific to the current use of
      golden frames and will need rework when RTC functionality is added.
      
      Change-Id: I7324a75acd96eafd9e0f9b8633d782e390d5dc21
      26bd81b9
    • John Koleszar's avatar
      Generalize and increase frame coding contexts · 4b65837b
      John Koleszar authored
      Previously there were two frame coding contexts tracked, one for normal
      frames and one for alt-ref frames. Generalize this by signalling the
      context to use in the bitstream, rather than tieing it to the alt ref
      refresh bit. Also increase the number of contexts available to 4, which
      may be useful for temporal scalability.
      
      Change-Id: I7b66daaddd55c535c20cd16713541fab182b1662
      4b65837b
    • John Koleszar's avatar
      Start to anonymize reference frames · da832a80
      John Koleszar authored
      Remove lst_fb_idx, gld_fb_idx, alt_fb_idx, refresh_last_frame,
      refresh_golden_frame, refresh_alt_ref_frame from common. Gold/Alt are
      encode side conventions. From the decoder's perspective, we want to be
      dealing with numbered references.
      
      Updates to active_ref 2 signal mode context switches, vestigial from
      refresh_alt_ref_frame. This needs some clean up to make sense with
      increased numbers of reference frames, as well as reimplementing the
      swapping of alt/golden which was previously done using the
      buffer-to-buffer copy mechanism removed in an earlier commit.
      
      Change-Id: I7334445158b7666f9295d2a2dd22aa03f4485f58
      da832a80
    • John Koleszar's avatar
      Remove buffer-to-buffer copy logic · b8e02798
      John Koleszar authored
      This is the first in a series of commits to add additional reference
      frames to the codec. Each frame will be able to update any of the
      available references, but copying between references is not
      supported.
      
      Change-Id: I5945b5ce6cc3582c495102b4e7eed4f08c44d5a1
      b8e02798
  10. 14 Jan, 2013 1 commit
    • Ronald S. Bultje's avatar
      Remove compound intra-intra experiment. · c9071601
      Ronald S. Bultje authored
      This experiment gives little gains and adds relatively much code
      complexity (and it hinders other experiments), so let's get rid of
      it.
      
      Change-Id: Id25e79a137a1b8a01138aa27a1fa0ba4a2df274a
      c9071601
  11. 10 Jan, 2013 2 commits
  12. 09 Jan, 2013 1 commit
    • Adrian Grange's avatar
      New prediction filter · 7d6b5425
      Adrian Grange authored
      This patch removes the old pred-filter experiment and replaces it
      with one that is implemented using the switchable filter framework.
      
      If the pred-filter experiment is enabled, three interopolation
      filters are tested during mode selection; the standard 8-tap
      interpolation filter, a sharp 8-tap filter and a (new) 8-tap
      smoothing filter.
      
      The 6-tap filter code has been preserved for now and if the
      enable-6tap experiment is enabled (in addition to the pred-filter
      experiment) the original 6-tap filter replaces the new 8-tap smooth
      filter in the switchable mode.
      
      The new experiment applies the prediction filter in cases of a
      fractional-pel motion vector. Future patches will apply the filter
      where the mv is pel-aligned and also to intra predicted blocks.
      
      Change-Id: I08e8cba978f2bbf3019f8413f376b8e2cd85eba4
      7d6b5425
  13. 08 Jan, 2013 1 commit
  14. 06 Jan, 2013 1 commit
  15. 02 Jan, 2013 1 commit
  16. 26 Dec, 2012 1 commit
  17. 19 Dec, 2012 1 commit
    • John Koleszar's avatar
      Use boolcoder API instead of inlining · 05ec800e
      John Koleszar authored
      This patch changes the token packing to call the bool encoder API rather
      than inlining it into the token packing function, and similarly removes
      a special get_signed case from the detokenizer. This allows easier
      experimentation with changing the bool coder as a whole.
      
      Change-Id: I52c3625bbe4960b68cfb873b0e39ade0c82f9e91
      05ec800e
  18. 12 Dec, 2012 1 commit
    • Ronald S. Bultje's avatar
      Consistently use get_prob(), clip_prob() and newly added clip_pixel(). · 4d0ec7aa
      Ronald S. Bultje authored
      Add a function clip_pixel() to clip a pixel value to the [0,255] range
      of allowed values, and use this where-ever appropriate (e.g. prediction,
      reconstruction). Likewise, consistently use the recently added function
      clip_prob(), which calculates a binary probability in the [1,255] range.
      If possible, try to use get_prob() or its sister get_binary_prob() to
      calculate binary probabilities, for consistency.
      
      Since in some places, this means that binary probability calculations
      are changed (we use {255,256}*count0/(total) in a range of places,
      and all of these are now changed to use 256*count0+(total>>1)/total),
      this changes the encoding result, so this patch warrants some extensive
      testing.
      
      Change-Id: Ibeeff8d886496839b8e0c0ace9ccc552351f7628
      4d0ec7aa
  19. 10 Dec, 2012 1 commit
    • Paul Wilkins's avatar
      Further changes to mv reference code. · d1244659
      Paul Wilkins authored
      Some further changes and refactoring of mv
      reference code and selection of center point for
      searches. Mainly relates to not passing so many
      different local copies of things around.
      
      Some place holder comments.
      
      Change-Id: I309f10ffe9a9cde7663e7eae19eb594371c8d055
      d1244659
  20. 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
  21. 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
  22. 30 Nov, 2012 1 commit
  23. 29 Nov, 2012 4 commits
  24. 28 Nov, 2012 2 commits
    • Jim Bankoski's avatar
      fixed includes to be fully specified · c6787398
      Jim Bankoski authored
      Change-Id: Ia1cce221f8511561b9cbd8edb7726fbc286ff243
      c6787398
    • John Koleszar's avatar
      Clamp decoded feature data · a1f15814
      John Koleszar authored
      Not all segment feature data elements are full-range powers of two, so
      there are values that can be encoded that are invalid. Add a new function
      to clamp values to the maximum allowed.
      
      Change-Id: Ie47cb80ef2d54292e6b8db9f699c57214a915bc4
      a1f15814
  25. 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
  26. 16 Nov, 2012 3 commits
    • Ronald S. Bultje's avatar
      Support 32x32 intra modes in non-keyframe superblocks. · 5b11052a
      Ronald S. Bultje authored
      Change-Id: Icf8ad313c543462e523bff89690e5daa8d49bcc0
      5b11052a
    • Paul Wilkins's avatar
      Further experimentation with the mode context · a57dbd95
      Paul Wilkins authored
      Experiments with a larger set of contexts and some
      clean up to replace magic numbers regarding the
      number of contexts.
      
      The starting values and rate of backwards adaption
      are still suspect and based on a small set of tests.
      Added forwards adjustment of probabilities.
      
      The net result of adding the new context and forward
      update is small compared to the old context from the
      legacy find_near function.  (down a little on derf but
      up by a similar amount for HD)
      
      HOWEVER.... with the new context and forward update
      the impact of disabling the reverse update (which may be
      necessary in some use cases to facilitate parallel decoding)
      is hugely reduced.
      
      For the old context without forward update, the impact of
      turning off reverse update (Experiment was with SB off) was
      Derf - 0.9, Yt -1.89, ythd -2.75 and sthd -8.35. The impact was
      mainly at low data rates.
      
      With the new context and forward update enabled the impact
      for all the test sets was no more than 0.5-1% (again most at
      the low end).
      
      Change-Id: Ic751b414c8ce7f7f3ebc6f19a741d774d2b4b556
      a57dbd95
    • Deb Mukherjee's avatar
      Compound inter-intra experiment · 0c917fc9
      Deb Mukherjee authored
      A patch on compound inter-intra prediction.
      
      In compound inter-intra prediction, a new predictor for
      16x16 inter coded MBs are obtained by combining a single
      inter predictor with a 16x16 intra predictor, in a manner
      that the weight varies with distance from the top/left
      boundary. The current search strategy is to combine the best
      inter mode with the best intra mode obtained independently.
      
      Results so far:
      
      derf +0.31%
      yt +0.32%
      std-hd +0.35%
      hd +0.42%
      
      It is conceivable that the results would improve somewhat
      with a more thorough search strategy where all intra modes
      are searched given the best mv, or even a joint search for
      the best mv and the best intra mode.
      
      Change-Id: I7951f1ed0d6eb31ca32ac24d120f1585bcd8d79b
      0c917fc9
  27. 14 Nov, 2012 1 commit
  28. 13 Nov, 2012 2 commits