JVET-R0130 on cleanup of tC derivation

source/Lib/CommonLib/LoopFilter.cpp

@@ -1041,7 +1041,12 @@ void LoopFilter::xEdgeFilterLuma( const CodingUnit& cu, const DeblockEdgeDir edg
       const int iIndexTC  = Clip3(0, MAX_QP + DEFAULT_INTRA_TC_OFFSET, int(iQP + DEFAULT_INTRA_TC_OFFSET*(uiBs - 1) + (tcOffsetDiv2 << 1)));
       const int iIndexB   = Clip3(0, MAX_QP, iQP + (betaOffsetDiv2 << 1));
 
+#if JVET_R0130_TC_DERIVATION_BUGFIX
+      const int roundOffset = 1 << (9 - bitDepthLuma);
+      const int iTc = bitDepthLuma < 10 ? ((sm_tcTable[iIndexTC] + roundOffset) >> (10 - bitDepthLuma)) : ((sm_tcTable[iIndexTC]) << (bitDepthLuma - 10));
+#else
       const int iTc = bitDepthLuma < 10 ? ((sm_tcTable[iIndexTC] + 2) >> (10 - bitDepthLuma)) : ((sm_tcTable[iIndexTC]) << (bitDepthLuma - 10));
+#endif
       const int iBeta     = sm_betaTable[iIndexB ] * iBitdepthScale;
       const int iSideThreshold = ( iBeta + ( iBeta >> 1 ) ) >> 3;
       const int iThrCut   = iTc * 10;

source/Lib/CommonLib/TypeDef.h

@@ -51,6 +51,8 @@
 #include <cassert>
 
 //########### place macros to be removed in next cycle below this line ###############
+#define JVET_R0130_TC_DERIVATION_BUGFIX                   1 // JVET-R0130: Cleanup of tC derivation for deblocking filter
+
 #define JVET_R0205                                        1 // JVET-R0205: Condition presence of inter_layer_ref_pics_present_flag on sps_video_parameter_set_id 
 
 #define JVET_R0186_CLEANUP                                1 // JVET-R0186 aspect 1: Signal the pps_no_pic_partition_flag ahead in the PPS.