Opened 12 years ago

Closed 11 years ago

#686 closed defect (fixed)

Difference between uiQtRootCbf and no_residual_syntax_flag

Reported by: tajime Owned by: bbross
Priority: minor Milestone: D9
Component: Text Version: D9 (K1003) v11
Keywords: Cc: fbossen, ksuehring, davidf, jct-vc@…


uiQtRootCbf in HM-8.0 is used as opposite meaning of no_residual_syntax_flag in the WD.

Subclause in the WD, the following appears:

if(PredMode[x0][y0]!=MODE_INTRA && !(PartMode==PART_2Nx2N && merge_flag[x0][y0]))
if(!no_residual_syntax_flag) {
 MaxTrafoDepth=(PredMode[x0][y0]==MODE_INTRA ? max_transform_hierarchy_depth_intra + IntraSplitFlag : max_transform_hierarchy_depth_inter)
 transform_tree( x0, y0 x0, y0, log2CbSize, 0, 0 )

In HM-8.0 TDecEntropy::decodeCoeff(), line 573:

 UInt uiQtRootCbf = 1;
 if( !( pcCU->getPartitionSize(uiAbsPartIdx)==SIZE_2Nx2N && pcCU->getMergeFlag( uiAbsPartIdx ) ) )
  m_pcEntropyDecoderIf->parseQtRootCbf(pcCU,uiAbsPartIdx,uiDepth,uiQtRootCbf );
xDecodeTransform(pcCU,uiLumaOffset,uiChromaOffset,uiAbsPartIdx, uiAbsPartIdx,uiDepth,uiWidth,uiHeight,0,0,bCodeDQP);

Change History (8)

comment:1 Changed 12 years ago by DefaultCC Plugin

  • Cc fbossen ksuehring davidf jct-vc@… added

comment:2 Changed 11 years ago by Parabola

I can confirm this report having discovered it independently.

In my opinion, this flag needs to be renamed in the specification to "residual_syntax_flag" -- boolean variables with negative semantics are not good style. If not present, residual_syntax_flag should be set to 1.
The condition in coding_unit() should then read: if (residual_syntax_flag) { .... transform_tree() .... }

Can this be changed to be a WD issue, not HM?

Last edited 11 years ago by Parabola (previous) (diff)

comment:3 Changed 11 years ago by ksuehring

  • Component changed from HM to Text
  • Milestone HM-8.1 deleted
  • Owner set to bbross
  • Status changed from new to assigned
  • Version changed from HM-8.0 to D9 (K1003) v9

In an offline discussion with a text editor we agreed that it would be preferable to align the text with the software because all similar flags have positive meaning and there would be no change in the context initializations need.

comment:4 Changed 11 years ago by bbross

  • Milestone set to D9
  • Version changed from D9 (K1003) v9 to D9 (K1003) v10

comment:5 Changed 11 years ago by bbross

  • Resolution set to fixed
  • Status changed from assigned to closed

comment:6 Changed 11 years ago by bbross

  • Resolution fixed deleted
  • Status changed from closed to new

comment:7 Changed 11 years ago by bbross

  • Version changed from D9 (K1003) v10 to D9 (K1003) v11

comment:8 Changed 11 years ago by bbross

  • Resolution set to fixed
  • Status changed from new to closed

Fixed in JCTVC-K1003_v13 by changing semantics according to HM and renaming no_residual_syntax_flag to rqt_root_cbf.

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These roles will be notified: Reporter, Owner, Subscriber, Participant

  • Benjamin Bross(Owner, Participant)
  • David Flynn(Subscriber)
  • Frank Bossen(Subscriber)
  • jct-vc@…(Subscriber)
  • John Funnell(Participant)
  • karl.sharman@…(Always)
  • Karsten Suehring(Subscriber, Participant, Always)
  • tajime(Reporter)