add a checking for temporal Id of GDR picture

source/Lib/CommonLib/TypeDef.h

@@ -281,6 +281,7 @@
 #define JVET_N0100_PROPOSAL1                              1 // JVET-N0100: ltrp picture signalling
 
 #define JVET_N0865_SYNTAX                                 1 // JVET_N0865 syntax elements
+#define JVET_N0865_NONSYNTAX                              1 // JVET_N0865 other than syntax parts
 #define JVET_N0865_GRA2GDR                                1 // Changing the name of GRA to GDR
 
 #define EMULATION_PREVENTION_FIX                          1 // fix for start code emulation reported in #270. Diverges from specification text

source/Lib/DecoderLib/DecLib.cpp

@@ -1135,6 +1135,11 @@ bool DecLib::xDecodeSlice(InputNALUnit &nalu, int &iSkipFrame, int iPOCLastDispl
   m_apcSlicePilot->setNalUnitType(nalu.m_nalUnitType);
   m_apcSlicePilot->setTLayer(nalu.m_temporalId);
 
+#if JVET_N0865_NONSYNTAX
+  if (nalu.m_nalUnitType == NAL_UNIT_CODED_SLICE_GDR)
+    CHECK(nalu.m_temporalId != 0, "Current GDR picture has TemporalId not equal to 0");
+#endif
+
   m_HLSReader.setBitstream( &nalu.getBitstream() );
   m_HLSReader.parseSliceHeader( m_apcSlicePilot, &m_parameterSetManager, m_prevTid0POC );