1. 04 Nov, 2017 1 commit
  2. 02 Nov, 2017 2 commits
    • Sebastien Alaiwan's avatar
      Remove experimental flag of EXT_TX · 3bac9928
      Sebastien Alaiwan authored
      This experiment has been adopted, we can simplify the code
      by dropping the associated preprocessor conditionals.
      
      Change-Id: I02ed47186bbc32400ee9bfadda17659d859c0ef7
      3bac9928
    • Dake He's avatar
      [level map] simplified context derivation · 03a32926
      Dake He authored
      This CL simplifies context derivation for nz and base level flags in
      level map.
      1. Reduce SIG_COEF_CONTEXTS from 58 to 42.
      2. NZ and base level flags share the same context offsets derived from a
      template of size 5 (down from 7).
      
      In limited runs, compression performance seems neutral if not better.
      Encoding time for a key frame on a local linux machine is reduced by about 25% or more.
      
      Change-Id: Ibd93b21c839154bc5ae26b993f9e66537cbf5942
      03a32926
  3. 01 Nov, 2017 5 commits
    • Sarah Parker's avatar
      Rename ZEROMV to GLOBALMV · 2b9ec2ea
      Sarah Parker authored
      This name better reflects the functionality of the mode.
      
      Change-Id: Idc2372e7c7b226f70f63fa4f272a88cb4d857089
      2b9ec2ea
    • Yue Chen's avatar
      Remove CONFIG_INTERINTRA · 670b660d
      Yue Chen authored
      Change-Id: Icbedc16b01adf9b48f0f357ec89143462865d54e
      670b660d
    • Zoe Liu's avatar
      Add decoder support to ext_skip · f704a1c8
      Zoe Liu authored
      At the frame header level, add the checking on whether an inter-coded
      frame allows the use of 'skip_mode'. At the block level, add the
      decoding of 'skip_mode' for all the blocks if 'skip_mode' is allowed
      for the current frame. If 'skip_mode' is set, no further bit needs to
      read out, and the block is set as:
      - Inter-coded in compound mode;
      - With the nearest forward and backward reference frames;
      - In NEAREST_NEARESTMV mode;
      - In SIMPLE_TRANSLATION motion mode;
      - In COMPOUND_AVERAGE compound type; and
      - Skip set for residual.
      
      Change-Id: I50297f63a81135109332c4a51b516bffd7726777
      f704a1c8
    • Jingning Han's avatar
      Reduce the context model size for base level · 819f45a3
      Jingning Han authored
      Further reduce the context model size needed for base levels down
      to 25 per transform size.
      
      Change-Id: I9df4870d2b027cdb1356de0fc4d5bcc22155319e
      819f45a3
    • Jingning Han's avatar
      Re-design base level context modeling · e775b8bc
      Jingning Han authored
      Reduce the context model size required to code the base level
      syntax values from 42 to 32 per transform size.
      
      Change-Id: I08485fdb563bc5c3323b0e147d69b47c286b9bb5
      e775b8bc
  4. 31 Oct, 2017 2 commits
  5. 30 Oct, 2017 1 commit
  6. 28 Oct, 2017 2 commits
    • Jingning Han's avatar
      Extend the eob context model · 35deaa73
      Jingning Han authored
      Account for 1-D/2-D transform kernels for the eob modeling. To
      maintain a smaller context cardinality, set the two 1-D transform
      kernels in the same category. The difference in directions should
      be largely covered by the scan order.
      
      This and the previous CLs on nz_map context modeling together
      improve the compression performance of level-map coefficient coding
      system by 0.4% for lowres.
      
      Change-Id: I8c4f03ca01ce3d248950d04bd1266f445b4227a0
      35deaa73
    • Jingning Han's avatar
      Account for rectangular transform block sizes in lv-map ctx · a24a6900
      Jingning Han authored
      Account for the rectangular transform block sizes in the non-zero
      map context model.
      
      Change-Id: I16cf21a4120c10c213df10950aeb4ef0ea40c477
      a24a6900
  7. 27 Oct, 2017 2 commits
    • Joe Young's avatar
      Ext-intra modification/tuning · 3ca43bf0
      Joe Young authored
      For ext-intra direcation intra modes:
      
      1. Use neighbor block modes to modify edge filtering strength
         Coding gain (lowres/midres/hdres):
           (8 keyframes)
           PSNR: -0.19 -0.22 -0.10
           SSIM: -0.29 -0.27 -0.13
      
      2. Use context-based cdf to code angle_delta syntax
           (8 keyframes)
           PSNR: -0.20 -0.24 -0.27
           SSIM: -0.29 -0.33 -0.37
      
      3. Filter corner sample:
           (8 keyframes)
           PSNR: -0.01 -0.02 -0.05
           SSIM: -0.03 -0.04 -0.05
      
      Combined Bd-rate improvement for 8 keyframes
           PSNR: -0.40 -0.47 -0.40
           SSIM: -0.57 -0.60 -0.51
      
      Change-Id: Id47ac17b6bf91cd810b70cacfc5b457341f417f3
      3ca43bf0
    • Cheng Chen's avatar
      JNT_COMP: 4. add context and entropy read/write · 0a7f2f51
      Cheng Chen authored
      Change-Id: I0e6f7ab981e31f7120105515f6204568b6dc82d3
      0a7f2f51
  8. 26 Oct, 2017 3 commits
  9. 25 Oct, 2017 1 commit
    • Yue Chen's avatar
      Optimizations for filter_intra · 57b8ff68
      Yue Chen authored
      Reduce number of modes from 10 to 6, and disable fi modes in UV.
      To reduce complexity, apply filter directly without subtracting
      the estimated means.
      
      Change-Id: Iaf78d92d31e4a7cc30ea7863b57a9611c5f503e6
      57b8ff68
  10. 24 Oct, 2017 4 commits
  11. 21 Oct, 2017 1 commit
  12. 19 Oct, 2017 1 commit
    • Cheng Chen's avatar
      Soft enable loopfilter_level · 9ac7a0f3
      Cheng Chen authored
      Enable it as it is adopted.
      Fix some compile warnings and compatibilities.
      
      Change-Id: If324e749e27ffa42f69a19ad5ebb39bc493b33ec
      9ac7a0f3
  13. 18 Oct, 2017 1 commit
  14. 17 Oct, 2017 1 commit
  15. 16 Oct, 2017 3 commits
  16. 13 Oct, 2017 1 commit
  17. 12 Oct, 2017 1 commit
    • Yue Chen's avatar
      filter_intra: make fi mode index entropy coded · 63ce36fc
      Yue Chen authored
      Make fi mode index entropy coded instead of using raw bits. Mode
      cost estimation in key-frame RDO is updated as well. Modification
      to inter frame RDO is not included in this patch.
      Also key-frame y mode cdf table is re-trained since fi modes are
      attached to DC_PRED
      
      Key frame BDRate:
      -0.399% lowres, -0.339% midres
      
      Change-Id: I9ccf478b0a2e48fb1870fe8451e45e2c858a5f63
      63ce36fc
  18. 11 Oct, 2017 1 commit
    • Cheng Chen's avatar
      Train LPF_SB cdf · 855f0fc7
      Cheng Chen authored
      Count filter level reuse, sign, and delta. And use counts to train
      default cdfs.
      Default cdf tables updated.
      
      Change-Id: If4fbf3e06ec7d568d940ca7b170bbbb4b778f176
      855f0fc7
  19. 10 Oct, 2017 1 commit
    • Lester Lu's avatar
      lgt-from-pred: transforms based on prediction · 432012f6
      Lester Lu authored
      In this experiment, sharp image discontinuity in the predicted
      block is detected. Based on this discontinuity, we choose
      particular LGTs as row and column transforms.
      
      Bitstream syntax, entropy coding, and RD search for LGT are added.
      One binary symbol is used to signal whether LGT is used. This
      experiment can work independently with the lgt experiment.
      
      lowres: -0.414% for key frames, -0.151% overall
      midres: -0.413% for key frames, -0.161% overall
      
      Change-Id: Iaa2f2c2839c34ca4134fa55e77870dc3f1fa879f
      432012f6
  20. 08 Oct, 2017 1 commit
  21. 06 Oct, 2017 1 commit
    • Jingning Han's avatar
      Rework key frame intra mode context model · a45d842d
      Jingning Han authored
      Reduce the context model size for key frame modes from 30240 bits
      to 4500 bits, i.e., less than 1/6 of the original context model.
      The coding performance loss on key frame is 0.14% for lowres and
      noise level difference for video sequence. The loss on key frame
      for midres is 0.05% and noise level for whole video. The change
      on hdres kf coding is 0.015%.
      
      Change-Id: I9e36825e5c5ee6ba35038c3ca349ad1ad3429910
      a45d842d
  22. 05 Oct, 2017 2 commits
  23. 04 Oct, 2017 2 commits
    • Zoe Liu's avatar
      Unify default probs for reference frame coding · e3c476e5
      Zoe Liu authored
      No performance change for scenario --disable-ext-comp-refs. For
      --enable-ext-comp-refs, a pretty tiny bitrate saving was resulted
      (-0.01~-0.02%).
      
      Change-Id: I7d12b28408bbfecc762108cbcf186b2a6ea07253
      e3c476e5
    • Cheng Chen's avatar
      LOOPFILTER_LEVEL: add flexibility for EXT_DELTA_Q · 880166ab
      Cheng Chen authored
      When experiment LOOPFILTER_LEVEL is on, there're four base filter levels
      for each frame. This patch enables one to use one delta or four deltas
      to update corresponding filter levels for each superblock in
      EXT_DELTA_Q.
      
      1 bit per frame is sent through bitstream to select one or four deltas.
      Now, we hard code to use one delta.
      
      Change-Id: I9c61a035064fa81878b0575ad21664e2b22a6a45
      880166ab