JVET-O0256: Non-CE: Fast encoder with adjusted threshold in dependent quantization

source/Lib/CommonLib/DepQuant.cpp

@@ -679,7 +679,11 @@ namespace DQIntern
     m_QScale                    = g_quantScales[needsSqrt2ScaleAdjustment?1:0][ qpRem ];
     const unsigned    qIdxBD    = std::min<unsigned>( maxLog2TrDynamicRange + 1, 8*sizeof(Intermediate_Int) + invShift - IQUANT_SHIFT - 1 );
     m_maxQIdx                   = ( 1 << (qIdxBD-1) ) - 4;
+#if JVET_O0256_ADJUST_THD_DEPQUANT
+    m_thresLast                 = TCoeff((int64_t(4) << m_QShift));
+#else
     m_thresLast                 = TCoeff((int64_t(3) << m_QShift));
+#endif
     m_thresSSbb                 = TCoeff((int64_t(3) << m_QShift));
     // distortion calculation parameters
     const int64_t qScale        = (gValue==-1) ? m_QScale : gValue;

source/Lib/CommonLib/TypeDef.h

@@ -52,6 +52,8 @@
 
 #define JVET_O0216_ALF_COEFF_EG3                          1 // JVET-O0216/O0302/O0648: using EG3 for ALF coefficients coding
 
+#define JVET_O0256_ADJUST_THD_DEPQUANT                    1 // JVET-O0256: Fast encoder with adjusted threshold in dependent quantization
+
 #define JVET_O0272_LMCS_SIMP_INVERSE_MAPPING              1 // JVET-O0272: LMCS simplified inverse mapping
 
 #define JVET_O0247_ALF_CTB_CODING_REDUNDANCY_REMOVAL      1 // JVET-O0247: not signal APS index when number APS is 2