1. 27 Mar, 2013 4 commits
    • Dmitry Kovalev's avatar
      Extract setup_frame_size and update_frame_context functions. · 8c69c193
      Dmitry Kovalev authored
      Extracting setup_frame_size and update_frame_context functions. Introducing
      vp9_read_prob function as shortcut for (vp9_prob)vp9_read_literal(r, 8).
      
      Change-Id: Ia5c68fd725b2d1b9c5eb20f69cacb62361b5a3dd
      8c69c193
    • Yunqing Wang's avatar
      Modify idct code to use macro · c6c0657c
      Yunqing Wang authored
      Small modification of idct code.
      
      Change-Id: I5c4e3223944c68e4ccf762f6cf07c990250e4290
      c6c0657c
    • Yunqing Wang's avatar
      Optimize 32x32 idct function · 21a718d9
      Yunqing Wang authored
      Wrote sse2 version of vp9_short_idct_32x32 function. Compared
      to c version, the sse2 version is 5X faster.
      
      Change-Id: I071ab7378358346ab4d9c6e2980f713c3c209864
      21a718d9
    • Ronald S. Bultje's avatar
      Scatter-based scantables. · 513157e0
      Ronald S. Bultje authored
      This gains about 0.2% on derf, 0.1% on hd and 0.4% on stdhd. I can put
      this under an experimental flag if wanted, just trying to get my patch
      queue in shape.
      
      Change-Id: Ibe1a30fe0e0b07bec4802e0f3ff0ba22e505f576
      513157e0
  2. 26 Mar, 2013 7 commits
    • Deb Mukherjee's avatar
      Implicit weighted prediction experiment · 23144d23
      Deb Mukherjee authored
      Adds an experiment to use a weighted prediction of two INTER
      predictors, where the weight is one of (1/4, 3/4), (3/8, 5/8),
      (1/2, 1/2), (5/8, 3/8) or (3/4, 1/4), and is chosen implicitly
      based on consistency of the predictors to the already
      reconstructed pixels to the top and left of the current macroblock
      or superblock.
      
      Currently the weighting is not applied to SPLITMV modes, which
      default to the usual (1/2, 1/2) weighting. However the code is in
      place controlled by a macro. The same weighting is used for Y and
      UV components, where the weight is derived from analyzing the Y
      component only.
      
      Results (over compound inter-intra experiment)
      derf: +0.18%
      yt: +0.34%
      hd: +0.49%
      stdhd: +0.23%
      
      The experiment suggests bigger benefit for explicitly signaled weights.
      
      Change-Id: I5438539ff4485c5752874cd1eb078ff14bf5235a
      23144d23
    • 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
    • Ronald S. Bultje's avatar
      Redo banding for all transforms. · 3120dbdd
      Ronald S. Bultje authored
      Now that the first AC coefficient in both directions use the same DC
      as their context, there no longer is a purpose in letting both have
      their own band. Merging these two bands allows us to split bands for
      some of the very high-frequency AC bands.
      
      In addition, I'm redoing the banding for the 1D-ADST col/row scans. I
      don't think the old banding made any sense at all (it merged the last
      coefficient of the first row/col in the same band as the first two of
      the second row/col), which was clearly an oversight from the band being
      applied in scan-order (rather than in their actual position). Now,
      coefficients at the same position will be in the same band, regardless
      what scan order is used. I think this makes most sense for the purpose
      of banding, which is basically "predict energy for this coefficient
      depending on the energy of context coefficients" (i.e. pt).
      
      After full re-training, together with previous patch, derf gains about
      1.2-1.3%, and hd/stdhd gain about 0.9-1.0%.
      
      Change-Id: I7a0cc12ba724e88b278034113cb4adaaebf87e0c
      3120dbdd
    • Ronald S. Bultje's avatar
      Use above/left (instead of previous in scan-order) as token context. · 790fb132
      Ronald S. Bultje authored
      Pearson correlation for above or left is significantly higher than for
      previous-in-scan-order (absolute values depend on position in scan, but
      in general, we gain about 0.1-0.2 by using either above or left; using
      both basically just makes this even better). For eob branch skipping,
      we continue to use the previous token in scan order.
      
      This helps about 0.9% on derf after re-training on a limited data set.
      Full re-training and results on larger-resolution clips are pending.
      
      Note that this commit breaks trellis, so we can probably get further
      gains out of it by fixing trellis at some later point.
      
      Change-Id: Iead68e296fc3a105cca746b5e3da9555d6010cfe
      790fb132
    • Dmitry Kovalev's avatar
      Cleaning up loopfilter code. · d7209b3a
      Dmitry Kovalev authored
      Lower case variable names, removing redundant variables, declaration and
      initialization on the same line.
      
      Change-Id: Ie0c6c95b14103990eb6a9d7784f8259c662e1251
      d7209b3a
    • John Koleszar's avatar
      Add an in-loop deringing experiment · 441e2eab
      John Koleszar authored
      Adds a per-frame, strength adjustable, in loop deringing filter. Uses
      the existing vp9_post_proc_down_and_across 5 tap thresholded blur
      code, with a brute force search for the threshold.
      
      Results almost strictly positive on the YT HD set, either having no
      effect or helping PSNR in the range of 1-3% (overall average 0.8%).
      Results more mixed for the CIF set, (-0.5 min, 1.4 max, 0.1 avg).
      This has an almost strictly negative impact to SSIM, so examining a
      different filter or a more balanced search heuristic is in order.
      
      Other test set results pending.
      
      Change-Id: I5ca6ee8fe292dfa3f2eab7f65332423fa1710b58
      441e2eab
    • 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
  3. 25 Mar, 2013 2 commits
    • Dmitry Kovalev's avatar
      Code cleanup. · 3644a5b6
      Dmitry Kovalev authored
      Fixing function arguments alignment, reusing MIN/MAX and clamp functions.
      
      Change-Id: I87dd5a40ffb65b521b8abbf0fccf2f50552c5309
      3644a5b6
    • Dmitry Kovalev's avatar
      Code cleanup. · 7cc14e59
      Dmitry Kovalev authored
      Lower case variable names, code simplification by using already defined
      clamp and read_le16 functions.
      
      Change-Id: I8fd544365bd8d1daed86d7b2ae0843e4ef80df08
      7cc14e59
  4. 21 Mar, 2013 2 commits
    • Yunqing Wang's avatar
      Optimize 16x16 idct10 function · 869d6c05
      Yunqing Wang authored
      Wrote sse2 version of vp9_short_idct10_16x16 function. Compared
      to c version, the sse2 version is 2.3X faster.
      
      Change-Id: I314c4f09369648721798321eeed6f58e38857f26
      869d6c05
    • Yunqing Wang's avatar
      Optimize 16x16 idct function · ec310066
      Yunqing Wang authored
      Wrote sse2 version of vp9_short_idct16x16 function. Compared to c
      version, the sse2 version is over 2.5X faster.
      
      Change-Id: I38536e2b846427a2cc5c5423aaf305fd0e605d61
      ec310066
  5. 20 Mar, 2013 1 commit
  6. 19 Mar, 2013 1 commit
  7. 18 Mar, 2013 2 commits
    • Yunqing Wang's avatar
      Optimize 8x8 idct function · 6344c84c
      Yunqing Wang authored
      Wrote sse2 functions of vp9_short_idct8x8 and vp9_short_idct10_8x8.
      Compared to c version, the sse2 version is 2X faster. The decoder
      test didn't show noticeable gain since 8x8 idct doesn't take much
      of decoding time (less than 1% in my test).
      
      Change-Id: I56313e18cd481700b3b52c4eda5ca204ca6365f3
      6344c84c
    • John Koleszar's avatar
      Replace scaling byte with explicit display size · 8a3f55f2
      John Koleszar authored
      If the intended display size is different than the size the frame is
      coded at, then send that size explicitly in the bitstream. Adds a new
      bit to the frame header to indicate whether the extra size fields
      are present.
      
      Change-Id: I525c66f22d207efaf1e5f903c6a2a91b80245854
      8a3f55f2
  8. 16 Mar, 2013 1 commit
    • Deb Mukherjee's avatar
      Context-pred fix to not use top/left on edges · b1921b2f
      Deb Mukherjee authored
      This fix resolves some of the mismatch issues being seen
      recently. While this is the right thing to do when tiling
      is used for this experiment, it is not the underlying cause
      of the the mismatches.
      Something else is causing writing outside of the allowable
      frame area in the encoder leading to this mismatch.
      
      Change-Id: If52c6f67555aa18ab8762865384e323b47237277
      b1921b2f
  9. 15 Mar, 2013 1 commit
    • Christian Duvivier's avatar
      Faster vp9_short_fdct16x16. · 4418b790
      Christian Duvivier authored
      Scalar path is about 1.5x faster (3.1% overall encoder speedup).
      SSE2 path is about 7.2x faster (7.8% overall encoder speedup).
      
      Change-Id: I06da5ad0cdae2488431eabf002b0d898d66d8289
      4418b790
  10. 14 Mar, 2013 3 commits
    • 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
  11. 13 Mar, 2013 3 commits
  12. 12 Mar, 2013 3 commits
  13. 11 Mar, 2013 3 commits
  14. 10 Mar, 2013 1 commit
    • John Koleszar's avatar
      Optimize vp9_tree_probs_from_distribution · bd84685f
      John Koleszar authored
      The previous implementation visited each node in the tree multiple times
      because it used each symbol's encoding to revisit the branches taken and
      increment its count. Instead, we can traverse the tree depth first and
      calculate the probabilities and branch counts as we walk back up. The
      complexity goes from somewhere between O(nlogn) and O(n^2) (depending on
      how balanced the tree is) to O(n).
      
      Only tested one clip (256kbps, CIF), saw 13% decoding perf improvement.
      
      Note that this optimization should port trivially to VP8 as well. In VP8,
      the decoder doesn't use this function, but it does routinely show up
      on the profile for realtime encoding.
      
      Change-Id: I4f2848e4f41dc9a7694f73f3e75034bce08d1b12
      bd84685f
  15. 09 Mar, 2013 1 commit
    • Deb Mukherjee's avatar
      Continued experiment with nonzero count · a28139c8
      Deb Mukherjee authored
      Adds probability updates for extra bits for the nzcs, code for
      getting nzc stats, plus some minor cleanups and fixes.
      
      Change-Id: If2814e7f04fb52f5025ad9f400f3e6c50a00b543
      a28139c8
  16. 08 Mar, 2013 2 commits
    • Yunqing Wang's avatar
      Add vp9_idct4_1d_sse2 · 11ca81f8
      Yunqing Wang authored
      Added SSE2 idct4_1d which is called by vp9_short_iht4x4. Also,
      modified the parameter type passed to vp9_short_iht functions to
      make it work with rtcd prototype.
      
      Change-Id: I81ba7cb4db6738f1923383b52a06deb760923ffe
      11ca81f8
    • Jingning Han's avatar
      Extend diff MV limit from +/-256 to +/-1024 · 2a5278bd
      Jingning Han authored
      Increase the motion search range by 4x. Change MV_CLASS tree of the
      entropy coding to allow two additional mv classes to cover the
      extended motion vector limit. The codec determines the effective
      motion search range conditioned on the actual frame dimension.
      
      It provides coding gains:
      
      stdhd 0.39%
      yt    0.56%
      hd    0.47%
      
      Major coding performance gains are packed in several sequences with
      intense motion activities, e.g., ped_1080p gains 7% at high bit-rates,
      and on average 3%.
      
      TODO: Need to further tune the rate control and motion search units.
      
      Change-Id: Ib842540a6796fbee5a797809433ef6a477c6d78d
      2a5278bd
  17. 07 Mar, 2013 3 commits