L0124 & L0208 Triangular shape prediction unit with the bug fix

cfg/encoder_lowdelay_vtm.cfg

@@ -130,6 +130,7 @@ ALF                          : 1
 GBi                          : 1 
 GBiFast                      : 1 
 MHIntra                      : 1
+Triangle                     : 1
 
 # Fast tools
 PBIntraFast                  : 1

cfg/encoder_randomaccess_vtm.cfg

@@ -145,6 +145,7 @@ GBi                          : 1
 GBiFast                      : 1
 BIO                          : 1 
 MHIntra                      : 1
+Triangle                     : 1
 
 # Fast tools
 PBIntraFast                  : 1

source/App/EncoderApp/EncApp.cpp

@@ -263,6 +263,9 @@ void EncApp::xInitLibCfg()
 #endif  
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   m_cEncLib.setUseMHIntra                                        ( m_MHIntra );
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+  m_cEncLib.setUseTriangle                                       ( m_Triangle );
 #endif
   // ADD_NEW_TOOL : (encoder app) add setting of tool enabling flags and associated parameters here
 

source/App/EncoderApp/EncAppCfg.cpp

@@ -868,6 +868,9 @@ bool EncAppCfg::parseCfg( int argc, char* argv[] )
 #endif
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   ("MHIntra",                                         m_MHIntra,                                        false, "Enable MHIntra mode")
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+  ("Triangle",                                        m_Triangle,                                       false, "Enable triangular shape motion vector prediction (0:off, 1:on)  [default: on]")
 #endif
   // ADD_NEW_TOOL : (encoder app) add parsing parameters here
 
@@ -1966,6 +1969,9 @@ bool EncAppCfg::xCheckParameter()
 #if JVET_L0646_GBI
     xConfirmPara( m_GBi, "GBi is only allowed with NEXT profile" );
     xConfirmPara( m_GBiFast, "GBiFast is only allowed with NEXT profile" );
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+    xConfirmPara( m_Triangle, "Triangle is only allowed with NEXT profile" );
 #endif
     // ADD_NEW_TOOL : (parameter check) add a check for next tools here
   }
@@ -3191,6 +3197,9 @@ void EncAppCfg::xPrintParameter()
 #endif
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
     msg(VERBOSE, "MHIntra:%d ", m_MHIntra);
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+    msg( VERBOSE, "Triangle:%d ", m_Triangle );
 #endif
   }
   // ADD_NEW_TOOL (add some output indicating the usage of tools)

source/App/EncoderApp/EncAppCfg.h

@@ -240,6 +240,9 @@ protected:
 
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   bool      m_MHIntra;
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+  bool      m_Triangle;
 #endif
   // ADD_NEW_TOOL : (encoder app) add tool enabling flags and associated parameters here
 

source/Lib/CommonLib/CodingStatistics.h

@@ -108,6 +108,10 @@ enum CodingStatisticsType
   STATS__TOOL_EMT,
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   STATS__CABAC_BITS__MH_INTRA_FLAG,
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+  STATS__CABAC_BITS__TRIANGLE_FLAG,
+  STATS__CABAC_BITS__TRIANGLE_INDEX,
 #endif
   STATS__TOOL_TOTAL,
   STATS__NUM_STATS
@@ -183,6 +187,10 @@ static inline const char* getName(CodingStatisticsType name)
     "CABAC_BITS__EMT_TU_INDX",
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
     "CABAC_BITS__MH_INTRA_FLAG",
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+    "CABAC_BITS__TRIANGLE_FLAG",
+    "CABAC_BITS__TRIANGLE_INDEX",
 #endif
     "CABAC_BITS__OTHER",
     "CABAC_BITS__INVALID",

source/Lib/CommonLib/CommonDef.h

@@ -415,6 +415,14 @@ static const int MAX_LADF_INTERVALS       =                         5; /// max n
 static const int NTAPS_BILINEAR           =                         2; ///< Number of taps for bilinear filter
 #endif
 
+#if JVET_L0124_L0208_TRIANGLE
+static const int TRIANGLE_MAX_NUM_UNI_CANDS =                       5;
+static const int TRIANGLE_MAX_NUM_CANDS_MEM =                       7;
+static const int TRIANGLE_MAX_NUM_CANDS =                          40;
+static const int TRIANGLE_MAX_NUM_SATD_CANDS =                      3;
+static const int TRIANGLE_MIN_SIZE =                            8 * 8;
+#endif
+
 // ====================================================================================================================
 // Macro functions
 // ====================================================================================================================

source/Lib/CommonLib/ContextModelling.cpp

@@ -359,6 +359,22 @@ unsigned DeriveCtx::CtxBTsplit(const CodingStructure& cs, Partitioner& partition
   return ctx;
 }
 
+#if JVET_L0124_L0208_TRIANGLE
+unsigned DeriveCtx::CtxTriangleFlag( const CodingUnit& cu )
+{
+  const CodingStructure *cs = cu.cs;
+  unsigned ctxId = 0;
+
+  const CodingUnit *cuLeft = cs->getCURestricted( cu.lumaPos().offset( -1, 0 ), cu, CH_L );
+  ctxId = ( cuLeft && cuLeft->triangle ) ? 1 : 0;
+
+  const CodingUnit *cuAbove = cs->getCURestricted( cu.lumaPos().offset( 0, -1 ), cu, CH_L );
+  ctxId += ( cuAbove && cuAbove->triangle ) ? 1 : 0;
+
+  return ctxId;
+}
+#endif
+
 
 void MergeCtx::setMergeInfo( PredictionUnit& pu, int candIdx )
 {

source/Lib/CommonLib/ContextModelling.h

@@ -353,6 +353,9 @@ unsigned CtxInterDir  ( const PredictionUnit& pu );
 unsigned CtxSkipFlag  ( const CodingUnit& cu );
 unsigned CtxIMVFlag   ( const CodingUnit& cu );
 unsigned CtxAffineFlag( const CodingUnit& cu );
+#if JVET_L0124_L0208_TRIANGLE
+unsigned CtxTriangleFlag( const CodingUnit& cu );
+#endif
 }
 
 #endif // __CONTEXTMODELLING__

source/Lib/CommonLib/Contexts.cpp

@@ -823,6 +823,22 @@ const CtxSet ContextSetCfg::MHIntraPredMode = ContextSetCfg::addCtxSet
 });
 #endif
 
+#if JVET_L0124_L0208_TRIANGLE
+const CtxSet ContextSetCfg::TriangleFlag = ContextSetCfg::addCtxSet
+({
+  { 151, 137, 154, },
+  { 151, 137, 154, },
+  { CNU, CNU, CNU, },
+});
+
+const CtxSet ContextSetCfg::TriangleIdx = ContextSetCfg::addCtxSet
+({
+  { 140, },
+  { 140, },
+  { CNU, },
+});
+#endif
+
 const unsigned ContextSetCfg::NumberOfContexts = (unsigned)ContextSetCfg::sm_InitTables[0].size();
 
 

source/Lib/CommonLib/Contexts.h

@@ -206,6 +206,10 @@ public:
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   static const CtxSet   MHIntraFlag;
   static const CtxSet   MHIntraPredMode;
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+  static const CtxSet   TriangleFlag;
+  static const CtxSet   TriangleIdx;
 #endif
   static const unsigned NumberOfContexts;
 

source/Lib/CommonLib/InterPrediction.h

@@ -91,6 +91,9 @@ protected:
   RdCost*              m_pcRdCost;
 
   int                  m_iRefListIdx;
+#if JVET_L0124_L0208_TRIANGLE
+  PelStorage           m_tmpTriangleBuf;
+#endif
 #if JVET_L0265_AFF_MINIMUM4X4
   Mv*                  m_storedMv;
 #endif
@@ -149,6 +152,11 @@ public:
   void    motionCompensation  (CodingUnit &cu,     const RefPicList &eRefPicList = REF_PIC_LIST_X
   );
 
+#if JVET_L0124_L0208_TRIANGLE
+  void    motionCompensation4Triangle( CodingUnit &cu, MergeCtx &TriangleMrgCtx, const bool SplitDir, const uint8_t CandIdx0, const uint8_t CandIdx1 );
+  void    TriangleWeighting          ( PredictionUnit &pu, bool ehanced, const bool SplitDir, int32_t channel, PelUnitBuf& PredDst, PelUnitBuf& PredSrc0, PelUnitBuf& PredSrc1 );
+#endif
+
 #if JVET_J0090_MEMORY_BANDWITH_MEASURE
   void    cacheAssign( CacheModel *cache );
 #endif

source/Lib/CommonLib/Rom.cpp

@@ -528,6 +528,30 @@ void initROM()
       //--------------------------------------------------------------------------------------------------
     }
   }
+
+#if JVET_L0124_L0208_TRIANGLE
+  for( int IdxH = MAX_CU_DEPTH - MIN_CU_LOG2; IdxH >= 0; --IdxH )
+  {
+    for( int IdxW = MAX_CU_DEPTH - MIN_CU_LOG2; IdxW >= 0; --IdxW )
+    {
+      int numW   = 1 << IdxW;
+      int numH   = 1 << IdxH;
+      int ratioW = std::max( 0, IdxW - IdxH );
+      int ratioH = std::max( 0, IdxH - IdxW );
+      int sum    = std::max( (numW >> ratioW), (numH >> ratioH) ) - 1;
+      for( int y = 0; y < numH; y++ )
+      {
+        int IdxY = y >> ratioH;
+        for( int x = 0; x < numW; x++ )
+        {
+          int IdxX = x >> ratioW;
+          g_TriangleMvStorage[TRIANGLE_DIR_135][IdxH][IdxW][y][x] = (IdxX == IdxY) ? 2 : (IdxX > IdxY ? 0 : 1);
+          g_TriangleMvStorage[TRIANGLE_DIR_45][IdxH][IdxW][y][x] = (IdxX + IdxY == sum) ? 2 : (IdxX + IdxY > sum ? 1 : 0);
+        }
+      }
+    }
+  }
+#endif
 }
 
 void destroyROM()
@@ -883,5 +907,65 @@ const uint8_t g_NonMPM[257] = { 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8 };
 
+#if JVET_L0124_L0208_TRIANGLE
+const Pel g_TrianglePelWeightedLuma[TRIANGLE_DIR_NUM][2][7] =
+{ 
+  { // TRIANGLE_DIR_135
+    { 1, 2, 4, 6, 7, 0, 0 },
+    { 1, 2, 3, 4, 5, 6, 7 }
+  },
+  { // TRIANGLE_DIR_45
+    { 7, 6, 4, 2, 1, 0, 0 },
+    { 7, 6, 5, 4, 3, 2, 1 }
+  }
+};
+const Pel g_TrianglePelWeightedChroma[2][TRIANGLE_DIR_NUM][2][7] =
+{
+  { // 444 format
+    { // TRIANGLE_DIR_135
+      { 1, 2, 4, 6, 7, 0, 0 },
+      { 1, 2, 3, 4, 5, 6, 7 }
+    },
+    { // TRIANGLE_DIR_45
+      { 7, 6, 4, 2, 1, 0, 0 },
+      { 7, 6, 5, 4, 3, 2, 1 }
+    }
+  },
+  { // 420 format
+    { // TRIANGLE_DIR_135
+      { 1, 4, 7, 0, 0, 0, 0 },
+      { 2, 4, 6, 0, 0, 0, 0 }
+    },
+    { // TRIANGLE_DIR_45
+      { 7, 4, 1, 0, 0, 0, 0 },
+      { 6, 4, 2, 0, 0, 0, 0 }
+    }
+  }
+};
+
+const uint8_t g_TriangleWeightLengthLuma[2] = { 5, 7 };
+const uint8_t g_TriangleWeightLengthChroma[2][2] = { { 5, 7 }, { 3, 3 } };
+
+      uint8_t g_TriangleMvStorage[TRIANGLE_DIR_NUM][MAX_CU_DEPTH - MIN_CU_LOG2 + 1][MAX_CU_DEPTH - MIN_CU_LOG2 + 1][MAX_CU_SIZE >> MIN_CU_LOG2][MAX_CU_SIZE >> MIN_CU_LOG2];
 
+const uint8_t g_TriangleCombination[TRIANGLE_MAX_NUM_CANDS][3] =
+{
+  { 0, 1, 0 }, { 1, 0, 1 }, { 1, 0, 2 }, { 0, 0, 1 }, { 0, 2, 0 }, 
+  { 1, 0, 3 }, { 1, 0, 4 }, { 1, 1, 0 }, { 0, 3, 0 }, { 0, 4, 0 }, 
+  { 0, 0, 2 }, { 0, 1, 2 }, { 1, 1, 2 }, { 0, 0, 4 }, { 0, 0, 3 }, 
+  { 0, 1, 3 }, { 0, 1, 4 }, { 1, 1, 4 }, { 1, 1, 3 }, { 1, 2, 1 }, 
+  { 1, 2, 0 }, { 0, 2, 1 }, { 0, 4, 3 }, { 1, 3, 0 }, { 1, 3, 2 }, 
+  { 1, 3, 4 }, { 1, 4, 0 }, { 1, 3, 1 }, { 1, 2, 3 }, { 1, 4, 1 }, 
+  { 0, 4, 1 }, { 0, 2, 3 }, { 1, 4, 2 }, { 0, 3, 2 }, { 1, 4, 3 }, 
+  { 0, 3, 1 }, { 0, 2, 4 }, { 1, 2, 4 }, { 0, 4, 2 }, { 0, 3, 4 }, 
+};
+
+const uint8_t g_TriangleIdxBins[TRIANGLE_MAX_NUM_CANDS] =
+{
+   2,  2,  4,  4,  4,  4,  6,  6,  6,  6,
+   6,  6,  6,  6,  8,  8,  8,  8,  8,  8,
+   8,  8,  8,  8,  8,  8,  8,  8,  8,  8,
+  10, 10, 10, 10, 10, 10, 10, 10, 10, 10
+};
+#endif
 //! \}

source/Lib/CommonLib/Rom.h

@@ -270,5 +270,15 @@ constexpr uint8_t g_tbMax[257] = { 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3,
 
 //! \}
 
+#if JVET_L0124_L0208_TRIANGLE
+extern const Pel     g_TrianglePelWeightedLuma[TRIANGLE_DIR_NUM][2][7];
+extern const Pel     g_TrianglePelWeightedChroma[2][TRIANGLE_DIR_NUM][2][7];
+extern const uint8_t g_TriangleWeightLengthLuma[2];
+extern const uint8_t g_TriangleWeightLengthChroma[2][2];
+extern       uint8_t g_TriangleMvStorage[TRIANGLE_DIR_NUM][MAX_CU_DEPTH - MIN_CU_LOG2 + 1][MAX_CU_DEPTH - MIN_CU_LOG2 + 1][MAX_CU_SIZE >> MIN_CU_LOG2][MAX_CU_SIZE >> MIN_CU_LOG2];
+extern const uint8_t g_TriangleCombination[TRIANGLE_MAX_NUM_CANDS][3];
+extern const uint8_t g_TriangleIdxBins[TRIANGLE_MAX_NUM_CANDS];
+#endif
+
 #endif  //__TCOMROM__
 

source/Lib/CommonLib/Slice.cpp

@@ -1651,6 +1651,9 @@ void Slice::updateMotionLUTs(LutMotionCand* lutMC, CodingUnit & cu)
 {
   PredictionUnit *selectedPU = cu.firstPU;
   if (cu.affine) { return; }
+#if JVET_L0124_L0208_TRIANGLE
+  if (cu.triangle) { return; }
+#endif
 
   MotionInfo newMi = selectedPU->getMotionInfo(); 
   addMotionInfoToLUTs(lutMC, newMi);
@@ -1757,6 +1760,9 @@ SPSNext::SPSNext( SPS& sps )
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   , m_MHIntra                   ( false )
 #endif
+#if JVET_L0124_L0208_TRIANGLE
+  , m_Triangle                  ( false )
+#endif
 #if ENABLE_WPP_PARALLELISM
   , m_NextDQP                   ( false )
 #endif

source/Lib/CommonLib/Slice.h

@@ -823,6 +823,9 @@ private:
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   bool              m_MHIntra;
 #endif
+#if JVET_L0124_L0208_TRIANGLE
+  bool              m_Triangle;
+#endif
 #if ENABLE_WPP_PARALLELISM
   bool              m_NextDQP;
 #endif
@@ -972,6 +975,10 @@ public:
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   void      setUseMHIntra         ( bool b )                                        { m_MHIntra = b; }
   bool      getUseMHIntra         ()                                      const     { return m_MHIntra; }
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+  void      setUseTriangle        ( bool b )                                        { m_Triangle = b; }
+  bool      getUseTriangle        ()                                      const     { return m_Triangle; }
 #endif
   // ADD_NEW_TOOL : (sps extension) add access functions for tool enabling flags and associated parameters here
 

source/Lib/CommonLib/TypeDef.h

@@ -50,6 +50,8 @@
 #include <assert.h>
 #include <cassert>
 
+#define JVET_L0124_L0208_TRIANGLE                         1 // triangular shape prediction unit
+
 #define JVET_L0059_MTS_SIMP                               1 // Simpification on MTS signaling
 #define JVET_L0100_MULTI_HYPOTHESIS_INTRA                 1 // Combine intra mode with an extra merge indexed prediction
 
@@ -942,6 +944,14 @@ enum MergeType
   NUM_MRG_TYPE                   // 5
 };
 
+#if JVET_L0124_L0208_TRIANGLE
+enum TriangleSplit
+{
+  TRIANGLE_DIR_135 = 0,
+  TRIANGLE_DIR_45,
+  TRIANGLE_DIR_NUM
+};
+#endif
 
 //////////////////////////////////////////////////////////////////////////
 // Encoder modes to try out

source/Lib/CommonLib/Unit.cpp

@@ -258,6 +258,9 @@ CodingUnit& CodingUnit::operator=( const CodingUnit& other )
 #endif
   affine            = other.affine;
   affineType        = other.affineType;
+#if JVET_L0124_L0208_TRIANGLE
+  triangle          = other.triangle;
+#endif
   transQuantBypass  = other.transQuantBypass;
   ipcm              = other.ipcm;
   qp                = other.qp;
@@ -292,6 +295,9 @@ void CodingUnit::initData()
 #endif
   affine            = false;
   affineType        = 0;
+#if JVET_L0124_L0208_TRIANGLE
+  triangle          = false;
+#endif
   transQuantBypass  = false;
   ipcm              = false;
   qp                = 0;

source/Lib/CommonLib/Unit.h

@@ -300,6 +300,9 @@ struct CodingUnit : public UnitArea
 #endif
   bool           affine;
   int            affineType;
+#if JVET_L0124_L0208_TRIANGLE
+  bool           triangle;
+#endif
   bool           transQuantBypass;
   bool           ipcm;
   uint8_t          imv;

source/Lib/CommonLib/UnitTools.h

@@ -173,6 +173,13 @@ namespace PU
   int  getMHIntraMPMs                 (const PredictionUnit &pu, unsigned *mpm, const ChannelType &channelType = CHANNEL_TYPE_LUMA, const bool isChromaMDMS = false, const unsigned startIdx = 0);
   int  getNarrowShape                 (const int width, const int height);
 #endif
+#if JVET_L0124_L0208_TRIANGLE
+  void getTriangleMergeCandidates     (const PredictionUnit &pu, MergeCtx& TriangleMrgCtx);
+  bool isUniqueTriangleCandidates     (const PredictionUnit &pu, MergeCtx& TriangleMrgCtx);
+  bool isTriangleEhancedWeight        (const PredictionUnit &pu, MergeCtx &TriangleMrgCtx, const uint8_t CandIdx0, const uint8_t CandIdx1);
+  void spanTriangleMotionInfo         (      PredictionUnit &pu, MergeCtx &TriangleMrgCtx, const uint8_t MergeIdx, const bool SplitDir, const uint8_t CandIdx0, const uint8_t CandIdx1);
+  int32_t mappingRefPic               (const PredictionUnit &pu, int32_t refPicPoc, bool targetRefPicList);
+#endif
 }
 
 // TU tools

source/Lib/DecoderLib/CABACReader.cpp

@@ -1172,6 +1172,9 @@ void CABACReader::prediction_unit( PredictionUnit& pu, MergeCtx& mrgCtx )
       pu.intraDir[1] = DM_CHROMA_IDX;
     }
 #endif
+#if JVET_L0124_L0208_TRIANGLE
+    triangle_mode( *pu.cu );
+#endif
 #if JVET_L0054_MMVD
     if (pu.mmvdMergeFlag)
     {
@@ -1413,6 +1416,25 @@ void CABACReader::merge_idx( PredictionUnit& pu )
 #endif
   int numCandminus1 = int( pu.cs->slice->getMaxNumMergeCand() ) - 1;
   pu.mergeIdx       = 0;
+
+#if JVET_L0124_L0208_TRIANGLE
+  if( pu.cu->triangle )
+  {
+    RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__TRIANGLE_INDEX );
+    if( m_BinDecoder.decodeBin( Ctx::TriangleIdx() ) == 0 )
+    {
+      pu.mergeIdx += m_BinDecoder.decodeBinEP();
+    }
+    else
+    {
+      pu.mergeIdx += exp_golomb_eqprob( 2 ) + 2;
+    }
+
+    DTRACE( g_trace_ctx, D_SYNTAX, "merge_idx() triangle_idx=%d\n", pu.mergeIdx );
+    return;
+  }
+#endif
+
   if( numCandminus1 > 0 )
   {
     if( m_BinDecoder.decodeBin( Ctx::MergeIdx() ) )
@@ -1728,6 +1750,23 @@ void CABACReader::MHIntra_luma_pred_modes(CodingUnit &cu)
 }
 #endif
 
+#if JVET_L0124_L0208_TRIANGLE
+void CABACReader::triangle_mode( CodingUnit& cu )
+{
+  RExt__DECODER_DEBUG_BIT_STATISTICS_CREATE_SET( STATS__CABAC_BITS__TRIANGLE_FLAG );
+
+  if( !cu.cs->slice->getSPS()->getSpsNext().getUseTriangle() || !cu.cs->slice->isInterB() || cu.lwidth() * cu.lheight() < TRIANGLE_MIN_SIZE || cu.affine )
+  {
+    return;
+  }
+  
+  unsigned flag_idx = DeriveCtx::CtxTriangleFlag( cu );
+  cu.triangle = m_BinDecoder.decodeBin( Ctx::TriangleFlag(flag_idx) );
+
+
+  DTRACE( g_trace_ctx, D_SYNTAX, "triangle_mode() triangle_mode=%d pos=(%d,%d) size: %dx%d\n", cu.triangle, cu.Y().x, cu.Y().y, cu.lumaSize().width, cu.lumaSize().height );
+}
+#endif
 
 //================================================================================
 //  clause 7.3.8.7

source/Lib/DecoderLib/CABACReader.h

@@ -111,6 +111,9 @@ public:
   void        MHIntra_flag              ( PredictionUnit&               pu );
   void        MHIntra_luma_pred_modes   ( CodingUnit&                   cu );
 #endif
+#if JVET_L0124_L0208_TRIANGLE
+  void        triangle_mode             ( CodingUnit&                   cu );
+#endif
 
   // pcm samples (clause 7.3.8.7)
   void        pcm_samples               ( TransformUnit&                tu );

source/Lib/DecoderLib/DecCu.cpp

@@ -314,12 +314,28 @@ void DecCu::xFillPCMBuffer(CodingUnit &cu)
 
 void DecCu::xReconInter(CodingUnit &cu)
 {
+#if JVET_L0124_L0208_TRIANGLE
+  if( cu.triangle )
+  {
+    const uint8_t mergeIdx = cu.firstPU->mergeIdx;
+    const bool    SplitDir = g_TriangleCombination[mergeIdx][0];
+    const uint8_t CandIdx0 = g_TriangleCombination[mergeIdx][1];
+    const uint8_t CandIdx1 = g_TriangleCombination[mergeIdx][2];
+    m_pcInterPred->motionCompensation4Triangle( cu, m_TriangleMrgCtx, SplitDir, CandIdx0, CandIdx1 );
+    PU::spanTriangleMotionInfo( *cu.firstPU, m_TriangleMrgCtx, mergeIdx, SplitDir, CandIdx0, CandIdx1 );
+  }
+  else
+  {
+#endif
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   m_pcIntraPred->geneIntrainterPred(cu);
 #endif
 
   // inter prediction
   m_pcInterPred->motionCompensation( cu );
+#if JVET_L0124_L0208_TRIANGLE
+  }
+#endif
 #if JVET_L0266_HMVP
   cu.slice->updateMotionLUTs(cu.slice->getMotionLUTs(), cu);
 #endif
@@ -486,6 +502,14 @@ void DecCu::xDeriveCUMV( CodingUnit &cu )
       {
 #endif
       {
+#if JVET_L0124_L0208_TRIANGLE
+        if( pu.cu->triangle )
+        {
+          PU::getTriangleMergeCandidates( pu, m_TriangleMrgCtx );
+        }
+        else
+        {
+#endif
         if( pu.cu->affine )
         {
 #if JVET_L0632_AFFINE_MERGE
@@ -593,6 +617,9 @@ void DecCu::xDeriveCUMV( CodingUnit &cu )
 
           PU::spanMotionInfo( pu, mrgCtx );
         }
+#if JVET_L0124_L0208_TRIANGLE
+        }
+#endif
       }
 #if JVET_L0054_MMVD
       }

source/Lib/DecoderLib/DecCu.h

@@ -92,6 +92,10 @@ private:
 
 
   MotionInfo        m_SubPuMiBuf[(MAX_CU_SIZE * MAX_CU_SIZE) >> (MIN_CU_LOG2 << 1)];
+
+#if JVET_L0124_L0208_TRIANGLE
+  MergeCtx          m_TriangleMrgCtx;
+#endif
 };
 
 //! \}

source/Lib/DecoderLib/VLCReader.cpp

@@ -818,6 +818,9 @@ void HLSyntaxReader::parseSPSNext( SPSNext& spsNext, const bool usePCM )
 #if JVET_L0100_MULTI_HYPOTHESIS_INTRA
   READ_FLAG( symbol,  "mhintra_flag" );                           spsNext.setUseMHIntra             ( symbol != 0 );
 #endif
+#if JVET_L0124_L0208_TRIANGLE
+  READ_FLAG( symbol,    "triangle_flag" );                          spsNext.setUseTriangle            ( symbol != 0 );
+#endif
 #if ENABLE_WPP_PARALLELISM
   READ_FLAG( symbol,  "next_dqp_enabled_flag" );                  spsNext.setUseNextDQP             ( symbol != 0 );
 #else

source/Lib/EncoderLib/CABACWriter.cpp

@@ -1132,6 +1132,9 @@ void CABACWriter::prediction_unit( const PredictionUnit& pu )
       MHIntra_luma_pred_modes( *pu.cu );
     }
 #endif
+#if JVET_L0124_L0208_TRIANGLE
+    triangle_mode( *pu.cu );
+#endif
 #if JVET_L0054_MMVD
     if (pu.mmvdMergeFlag)
     {
@@ -1354,6 +1357,24 @@ void CABACWriter::merge_idx( const PredictionUnit& pu )
   }
   else
   {
+#endif
+#if JVET_L0124_L0208_TRIANGLE
+    if( pu.cu->triangle )
+    {
+      if( pu.mergeIdx < 2 )
+      {
+        m_BinEncoder.encodeBin( 0, Ctx::TriangleIdx() );
+        m_BinEncoder.encodeBinEP( pu.mergeIdx );
+      }
+      else
+      {
+        m_BinEncoder.encodeBin( 1, Ctx::TriangleIdx() );
+        exp_golomb_eqprob( pu.mergeIdx - 2, 2 );
+      }
+
+      DTRACE( g_trace_ctx, D_SYNTAX, "merge_idx() triangle_idx=%d\n", pu.mergeIdx );
+      return;
+    }
 #endif
   int numCandminus1 = int( pu.cs->slice->getMaxNumMergeCand() ) - 1;
   if( numCandminus1 > 0 )
@@ -1618,6 +1639,22 @@ void CABACWriter::MHIntra_luma_pred_modes(const CodingUnit& cu)
 }
 #endif
 
+#if JVET_L0124_L0208_TRIANGLE
+void CABACWriter::triangle_mode( const CodingUnit& cu )
+{
+  if( !cu.cs->slice->getSPS()->getSpsNext().getUseTriangle() || !cu.cs->slice->isInterB() || cu.lwidth() * cu.lheight() < TRIANGLE_MIN_SIZE || cu.affine )