id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
337	Cross component prediction tool in VTM but not described in spec	jonathang		"In VTM 5.0 within CABACReader::transform_unit, the following code may result in the decoding of a CCP flag, and then a CCP alpha value
{{{ #!C++
        if( TU::hasCrossCompPredInfo( tu, compID ) )
        {
          cross_comp_pred( tu, compID );
        }


void CABACReader::cross_comp_pred( TransformUnit& tu, ComponentID compID )
{
  signed char alpha   = 0;
  unsigned    ctxBase = ( compID == COMPONENT_Cr ? 5 : 0 );
  unsigned    symbol  = m_BinDecoder.decodeBin( Ctx::CrossCompPred(ctxBase) );
  if( symbol )
  {
    // Cross-component prediction alpha is non-zero.
    symbol = m_BinDecoder.decodeBin( Ctx::CrossCompPred(ctxBase+1) );
    if( symbol )
    {
      // alpha is 2 (symbol=1), 4(symbol=2) or 8(symbol=3).
      // Read up to two more bits
      symbol += unary_max_symbol( Ctx::CrossCompPred(ctxBase+2), Ctx::CrossCompPred(ctxBase+3), 2 );
    }
    alpha = ( 1 << symbol );
    if( m_BinDecoder.decodeBin( Ctx::CrossCompPred(ctxBase+4) ) )
    {
      alpha = -alpha;
    }
  }
  tu.compAlpha[compID] = alpha;
}
}}}
In the current spec there are no syntax elements for CCP. Given the CCLM intra prediction mode and the joint chroma residual coding, is CCP to be removed?"	defect	closed	minor		VTM	VTM-5.0	fixed		ksuehring XiangLi fbossen jvet@…