JVET-K0122:

Sampes of a larger side are used to get DC value for non-square blocks
Square blocks processing is HEVC-compliant

source/Lib/CommonLib/IntraPrediction.cpp

@@ -208,17 +208,35 @@ Pel IntraPrediction::xGetPredValDc( const CPelBuf &pSrc, const Size &dstSize )
   Pel pDcVal;
   const int width  = dstSize.width;
   const int height = dstSize.height;
+#if JVET_K0122
+  const int iState      = (width == height) ? 0            : ((width > height) ? 1     : -1);
+  const SizeType iDenom = (width == height) ? (width << 1) : ((width > height) ? width : height);
+  const Int iDivShift   = g_aucLog2[iDenom];
+  const Int iDivOffset  = (iDenom >> 1);
 
+  if (iState >= 0) //width is a larger side or a block is square
+  {
+#endif
   for( iInd = 0; iInd < width; iInd++ )
   {
     iSum += pSrc.at( 1 + iInd, 0 );
   }
+#if JVET_K0122
+  }
+  if (iState <= 0) //height is a larger side or a block is square
+  {   
+#endif
   for( iInd = 0; iInd < height; iInd++ )
   {
     iSum += pSrc.at( 0, 1 + iInd );
+  }  
+#if JVET_K0122
   }
 
+  pDcVal = (iSum + iDivOffset) >> iDivShift;
+#else
   pDcVal = ( iSum + ( ( width + height ) >> 1 ) ) / ( width + height );
+#endif
   return pDcVal;
 }
 

source/Lib/CommonLib/TypeDef.h

@@ -59,6 +59,9 @@
 
 #define JVET_K0072                                        1
 
+#define JVET_K0122                                        1 // CE3-related: Alternative techniques for DC mode without division
+                                                            // Test 2: Samples are taken only along with a longer side
+
 #define JVET_K0220_ENC_CTRL                               1 // remove HM_NO_ADDITIONAL_SPEEDUPS when adopting
 #if JVET_K0220_ENC_CTRL
 #define REUSE_CU_RESULTS                                  1