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• Revision 1407cf8588 : Fix VP9_mode_order[] Mis-merge of the following change managed to break mode or

  13 septembre 2013, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Fix VP9_mode_order[]

  Mis-merge of the following change managed to break mode order
  and delete two mode options (new alt ref and near alt ref)
  It also created a situation where we could test two undefined
  modes off the end of the VP9_mode_order[] data structure.
  "clang warnings : remove split and i4x4_pred fake modes"
  "Change Id : I8ef3c*"

  Initial testing on Akiyo at speed 2.
  101.35 44.567 44.447 improves to
  96.82 44.915 44.815

  Approx 0.3-0.4db gain and 2.5% size reduction

  Change-Id : Icff813e7c0778d140ad4f0eea18cf1ed203c4e34

• Revision d9b62160a0 : Implements several heuristics to prune mode search Skips mode searches for intr

  3 juillet 2013, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Implements several heuristics to prune mode search

  Skips mode searches for intra and compound inter modes depending
  on the best mode so far and the reference frames. The various
  heuristics to be used are selected by bits from a flag. The
  previous direction based intra mode search pruning is also absorbed
  in this framework.

  Specifically the flags and their impact are :

  1) FLAG_SKIP_INTRA_BESTINTER (skip intra mode search for oblique
  directional modes and TM_PRED if the best so far is
  an inter mode)
  derfraw300 : -0.15%, 10% speedup

  2) FLAG_SKIP_INTRA_DIRMISMATCH (skip D27, D63, D117 and D153
  mode search if the best so far is not one of the closest
  hor/vert/diagonal directions.
  derfraw300 : -0.05%, about 9% speedup

  3) FLAG_SKIP_COMP_BESTINTRA (skip compound prediction mode
  search if the best so far is an intra mode)
  derfraw300 : -0.06%, about 7-8% speedup

  4) FLAG_SKIP_COMP_REFMISMATCH (skip compound prediction search
  if the best single ref inter mode does not have the same ref
  as one of the two references being tested in the compound mode)
  derfraw300 : -0.56%, about 10% speedup

  Change-Id : I1a736cd29b36325489e7af9f32698d6394b2c495

• Revision 8d3d2b76f3 : Tx size selection enhancements (1) Refines the modeling function and uses that

  22 juin 2013, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Tx size selection enhancements

  (1) Refines the modeling function and uses that to add some speed
  features. Specifically, intead of using a flag use_largest_txfm as
  a speed feature, an enum tx_size_search_method is used, of which
  two of the types are USE_FULL_RD and USE_LARGESTALL. Two other
  new types are added :
  USE_LARGESTINTRA (use largest only for intra)
  USE_LARGESTINTRA_MODELINTER (use largest for intra, and model for
  inter)

  (2) Another change is that the framework for deciding transform type
  is simplified to use a heuristic count based method rather than
  an rd based method using txfm_cache. In practice the new method
  is found to work just as well - with derf only -0.01 down.
  The new method is more compatible with the new framework where
  certain rd costs are based on full rd and certain others are
  based on modeled rd or are not computed. In this patch the existing
  rd based method is still kept for use in the USE_FULL_RD mode.
  In the other modes, the count based method is used.
  However the recommendation is to remove it eventually since the
  benefit is limited, and will remove a lot of complications in
  the code

  (3) Finally a bug is fixed with the existing use_largest_txfm speed feature
  that causes mismatches when the lossless mode and 4x4 WH transform is
  forced.

  Results on derf :
  USE_FULL_RD : +0.03% (due to change in the tables), 0% encode time reduction
  USE_LARGESTINTRA : -0.21%, 15% encode time reduction (this one is a
  pretty good compromise)
  USE_LARGESTINTRA_MODELINTER : -0.98%, 22% encode time reduction
  (currently the benefit of modeling is limited for txfm size selection,
  but keeping this enum as a placeholder) .
  USE_LARGESTALL : -1.05%, 27% encode-time reduction (same as existing
  use_largest_txfm speed feature).

  Change-Id : I4d60a5f9ce78fbc90cddf2f97ed91d8bc0d4f936