Fix #1409: Don't scale 15/16 bit sequences to lower bit depths if...

Fix #1409: Don't scale 15/16 bit sequences to lower bit depths if JVET_R0351_HIGH_BIT_DEPTH_ENABLED is not set

source/Lib/Utilities/VideoIOYuv.cpp

@@ -952,6 +952,12 @@ bool VideoIOYuv::read ( PelUnitBuf& pic, PelUnitBuf& picOrg, const InputColourSp
       {
          EXIT("Source image contains values outside the specified bit range!");
       }
+#if !JVET_R0351_HIGH_BIT_DEPTH_ENABLED
+      if (m_fileBitdepth[chType] > 14 && m_bitdepthShift[chType] < 0)
+      {
+        EXIT("JVET_R0351_HIGH_BIT_DEPTH_ENABLED must be enabled for bit depths above 14 if INTERNALBITDEPTH < INPUTBITDEPTH");
+      }
+#endif
       scalePlane( picOrg.get(compID), m_bitdepthShift[chType], minval, maxval);
     }
   }