1. 22 Feb, 2017 13 commits
  2. 18 Feb, 2017 4 commits
  3. 17 Feb, 2017 4 commits
    • Debargha Mukherjee's avatar
      Support trapezoidal models for global motion · 5dfa9300
      Debargha Mukherjee authored
      Adds functinoality for least-squares, RANSAC as well as encoding and
      decoding with new constrained homographies that warp blocks to horizontal
      and/or vertical trapezoids. This is for future experimentation. None
      of the models are actually enabled in the code.
      
      Change-Id: I1936018c6b11587d6fd83c3a2c63548cb641b33f
      5dfa9300
    • Nathan E. Egge's avatar
      Use tx_size_cdf with CONFIG_EC_MULTISYMBOL. · 2ea519e5
      Nathan E. Egge authored
      This commit produces a bit-exact bitstream because prior calls to code
       the tx_size using aom_write_tree() would automatically convert the
       aom_tree_index on the fly to a CDF.
      The tx_size_cdf[]'s are now computed once per frame.
      Based on recent tests, this patch reduces decode time by 4%.
      
      Change-Id: I920dbf036b8a9574ea6e65ae5f9c43eef1c3f864
      2ea519e5
    • Yushin Cho's avatar
      Remove PVQ_CHROMA_RD codes · 5c207296
      Yushin Cho authored
      Which was a workaround to balance the quality between
      luma and chroma when PVQ is enabled, by
      1) skipping PVQ DC RDO for chroma and
      2) using smaller lambda value (x0.5) for intra prediction of chroma,
      intended to spend more bits and thus improve quality for chroma.
      
      The change in metric for 5 frames of objective-1-fast is:
      PSNR  PSNR-HVS  SSIM  CIEDE-2000  PSNR Cb PSNR Cr  MS-SSIM
      -1.45 -1.54     -1.46 4.62        13.71   14.87     -1.47
      
      For still images (subset1)
      PSNR  PSNR-HVS  SSIM  CIEDE-2000  PSNR Cb PSNR Cr  MS-SSIM VMAF
      -1.52 -1.54     -1.60 2.56        11.92   12.17     -1.52  -1.66
      
      Change-Id: I31c4d7a7de2939f6004c112649f7303f0e944156
      5c207296
    • Rostislav Pehlivanov's avatar
      Implement a new rate control system · 002e7b7a
      Rostislav Pehlivanov authored
      This commit implements a new rate control system which was ported from
      Daala's rate control system (which was based off of Theora's rate
      control system) to the encoder. Its aim is to address the weaknesses of
      the current rate control system and eventually serve as its replacement.
      
      This is still work in progress. So far this commit only implements
      support for single pass encoding for constant quality and bitrate
      targeting.
      Additional commits which implement two-pass support and the rest to
      match the feature set of the current rate control system are coming
      soon.
      
      The rate control system hasn't been fully tuned (and will likely need
      additional tuning as the encoder's development progresses) and does
      contain some "hacks", to convert the quality to a quantizer value
      (empirical) and to tweak the quantizer in between golden frames (which
      uses some code from the current rate control system as well as code
      which attempts to model what that code does), the latter of which is
      only in the constant quality codepath.
      
      Bitrate targeting works much better than the current rate control
      system's targeting and will actually closely match the rate specified by
      the user without the current rate control system's bursty behaviour.
      
      Change-Id: I588fbfd2e80a3d21ce7176903115d6a96ef1700a
      002e7b7a
  4. 16 Feb, 2017 4 commits
  5. 15 Feb, 2017 1 commit
    • David Barker's avatar
      Speed up global motion determination · 15338d5f
      David Barker authored
      When global-motion is enabled, a considerable amount
      of encoder time is spent in the functions in corner_match.c.
      This patch optimizes those functions to be 3.5-4x as fast,
      leading to an end-to-end encoder speed improvement
      (on 20 frames of tempete_cif.y4m) of:
      
       200kbps: ~26% faster
       800kbps: ~19% faster
      2800kbps: ~12% faster
      
      Change-Id: I04d3f87484c36c41eb5a1e86e814f2accbe86297
      15338d5f
  6. 14 Feb, 2017 4 commits
  7. 13 Feb, 2017 3 commits
  8. 12 Feb, 2017 3 commits
    • Jingning Han's avatar
      Make adapt-scan support multi-thread encoding · 5d0b310b
      Jingning Han authored
      This commit makes the adaptive scan order system support multi-
      thread encoding. It fixes unit test failure issue associated with
      AV1/AVxEncoderThreadTest.EncoderResultTest/0.
      
      BUG=aomedia:353
      
      Change-Id: I61cbf9531c8deab97fb3bb17428d0b2a63cf309a
      5d0b310b
    • Jingning Han's avatar
      Separate intra tx_size logic between var-tx and rect-tx · cb512283
      Jingning Han authored
      Skip rectangular transform block size coding for intra coded block
      in var-tx mode, when the rect-tx is disabled.
      
      Change-Id: If3a091d25f19bf4a67485b5d235bb3d7d0c2cd03
      cb512283
    • David Barker's avatar
      Fix segfault with loop-restoration on x86. · befcc425
      David Barker authored
      The WienerInfo struct requires a 16-byte alignment on x86,
      since it contains filter coefficients which are loaded using
      SSE aligned load instructions. But on 32-bit x86, the default
      alignment of aom_malloc/aom_realloc is only 8 bytes, leading
      to occasional segfaults.
      
      To fix this, rather than using aom_realloc to resize WienerInfo
      structures, we always free and re-allocate them using aom_memalign
      
      BUG=aomedia:345
      
      Change-Id: Ib1b2a42d4a2fa215dcc81ea481c51271ab068a37
      befcc425
  9. 11 Feb, 2017 1 commit
    • Zoe Liu's avatar
      Add a new experiment of REF_ADAPT · b05e5d10
      Zoe Liu authored
      Noticed that some ALTREF_FRAMEs could have used compound modes for its
      prediction but have been labeled as SINGLE_REFERENCE mode in the frame
      header. This experiment is to remove the COMPOUND_REFERENCE mode from
      the frame-level reference mode choices and only leave SINGLE_REFERENCE
      and REFERENCE_MODE_SELECT the two choices in the frame header.
      
      When turning on both ext-refs and ref-adapt, compared against ext-refs
      itself, a small gain is achieved. In PSNR, the bitrate saving gains are
      as follows:
      
      lowres: Avg -0.120%; BDRate -0.128%
      midres: Avg -0.155%; BDRate -0.128%
      
      Change-Id: I2cfff8a6b7eaa65ef863dbdbc4dd086d3b586f8c
      b05e5d10
  10. 10 Feb, 2017 1 commit
    • Steinar Midtskogen's avatar
      Retune the CLPF kernel · 4f0b3ed8
      Steinar Midtskogen authored
      CLPF performance had degraded by about 0.5% over the past six months,
      which isn't totally surprising since the codec is a moving target.
      About half of that degradation comes from the improved 7 bit filter
      coefficients.  Therefore, CLPF needs to be retuned for the current
      codec.
      
      This patch makes two (normative) changes to the CLPF kernel:
      
      * The clipping function was changed from clamp(x, -s, s) to
            sign(x) * max(0, abs(x) - max(0, abs(x) - s +
                   (abs(x) >> (bitdepth - 3 - log2(s)))))
        This adds a rampdown to 0 at -32 and 32 (for 8 bit, -128 & 128
        for 10 bit, etc), so large differences are ignored.
      
      * 8 taps instead of 6 taps:
                     1
          4          3
        13 31  ->  13 31
          4          3
                     1
      
      AWCY results: low delay  high delay
      PSNR:           -0.40%     -0.47%
      PSNR HVS:        0.00%     -0.11%
      SSIM:           -0.31%     -0.39%
      CIEDE 2000:     -0.22%     -0.31%
      APSNR:          -0.40%     -0.48%
      MS SSIM:         0.01%     -0.12%
      
      About 3/4 of the gains come from the new clipping function.
      
      Change-Id: Idad9dc4004e71a9c7ec81ba62ebd12fb76fb044a
      4f0b3ed8
  11. 09 Feb, 2017 1 commit
  12. 08 Feb, 2017 1 commit