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/** \file     Contexts.cpp
 *  \brief    Classes providing probability descriptions and contexts (also contains context initialization values)
 */

#include "Contexts.h"

#include <algorithm>
#include <cstring>
#include <limits>

namespace vvdec
{

const uint8_t ProbModelTables::m_RenormTable_32[32] =
{
  6,  5,  4,  4,
  3,  3,  3,  3,
  2,  2,  2,  2,
  2,  2,  2,  2,
  1,  1,  1,  1,
  1,  1,  1,  1,
  1,  1,  1,  1,
  1,  1,  1,  1
};


void BinProbModel::init( int qp, int initId )
{
  int slope       =   ( initId >> 3 ) -  4;
  int offset      = ( ( initId  & 7 ) * 18 ) + 1;
  int inistate    = ( ( slope   * ( qp - 16 ) ) >> 1 ) + offset;
  int state_clip  = inistate < 1 ? 1 : inistate > 127 ? 127 : inistate;
  int p1          = ( state_clip << 8 );

  m_state[0]      = p1 & MASK_0;
  m_state[1]      = p1 & MASK_1;
}

CtxSet::CtxSet( std::initializer_list<CtxSet> ctxSets )
{
  uint16_t minOffset = std::numeric_limits<uint16_t>::max();
  uint16_t maxOffset = 0;
  for( auto& set: ctxSets )
  {
    minOffset = std::min<uint16_t>( minOffset, set.Offset );
    maxOffset = std::max<uint16_t>( maxOffset, set.Offset + set.Size );
  }
  Offset = minOffset;
  Size   = maxOffset - minOffset;
}

const std::vector<uint8_t>& ContextSetCfg::getInitTable( unsigned initId )
{
  CHECK( initId >= (unsigned)sm_InitTables.size(),
                     "Invalid initId (" << initId << "), only " << sm_InitTables.size() << " tables defined." );
  return sm_InitTables[initId];
}


CtxSet ContextSetCfg::addCtxSet( std::initializer_list<std::initializer_list<uint8_t>> initSet2d )
{
  const std::size_t startIdx  = sm_InitTables[0].size();
  const std::size_t numValues = ( *initSet2d.begin() ).size();
        std::size_t setId     = 0;
  for( auto& initSet: initSet2d )
  {
    if( setId >= sm_InitTables.size() )
      break;

    CHECK( initSet.size() != numValues,
                       "Number of init values do not match for all sets (" << initSet.size() << " != " << numValues << ")." );

    for( auto& elemIter: initSet )
    {
      sm_InitTables[setId].push_back( elemIter );
    }

    setId++;
  }
  return CtxSet( (uint16_t)startIdx, (uint16_t)numValues );
}


std::array<std::vector<uint8_t>, NUMBER_OF_SLICE_TYPES + 1> ContextSetCfg::sm_InitTables;

// clang-format off
const CtxSet ContextSetCfg::SplitFlag = ContextSetCfg::addCtxSet
({
  {  18,  27,  15,  18,  28,  45,  26,   7,  23, },
  {  11,  35,  53,  12,   6,  30,  13,  15,  31, },
  {  19,  28,  38,  27,  29,  38,  20,  30,  31, },
  {  12,  13,   8,   8,  13,  12,   5,   9,   9, },
});

const CtxSet ContextSetCfg::SplitQtFlag = ContextSetCfg::addCtxSet
({
  {  26,  36,  38,  18,  34,  21, },
  {  20,  14,  23,  18,  19,   6, },
  {  27,   6,  15,  25,  19,  37, },
  {   0,   8,   8,  12,  12,   8, },
});

const CtxSet ContextSetCfg::SplitHvFlag = ContextSetCfg::addCtxSet
({
  {  43,  42,  37,  42,  44, },
  {  43,  35,  37,  34,  52, },
  {  43,  42,  29,  27,  44, },
  {   9,   8,   9,   8,   5, },
});

const CtxSet ContextSetCfg::Split12Flag = ContextSetCfg::addCtxSet
({
  {  28,  29,  28,  29, },
  {  43,  37,  21,  22, },
  {  36,  45,  36,  45, },
  {  12,  13,  12,  13, },
});

const CtxSet ContextSetCfg::ModeConsFlag = ContextSetCfg::addCtxSet
({
  {  25,  20, },
  {  25,  12, },
  { CNU, CNU, },
  {   1,   0, },
});

const CtxSet ContextSetCfg::SkipFlag = ContextSetCfg::addCtxSet
({
  {  57,  60,  46, },
  {  57,  59,  45, },
  {   0,  26,  28, },
  {   5,   4,   8, },
});

const CtxSet ContextSetCfg::MergeFlag = ContextSetCfg::addCtxSet
({
  {   6, },
  {  21, },
  {  26, },
  {   4, },
});

const CtxSet ContextSetCfg::RegularMergeFlag = ContextSetCfg::addCtxSet
({
  {  46,  15, },
  {  38,   7, },
  { CNU, CNU, },
  {   5,   5, },
});

const CtxSet ContextSetCfg::MergeIdx = ContextSetCfg::addCtxSet
({
  {  18, },
  {  20, },
  {  34, },
  {   4, },
});

const CtxSet ContextSetCfg::MmvdFlag = ContextSetCfg::addCtxSet
({
  {  25, },
  {  26, },
  { CNU, },
  {   4, },
});

const CtxSet ContextSetCfg::MmvdMergeIdx = ContextSetCfg::addCtxSet
({
  {  43, },
  {  43, },
  { CNU, },
  {  10, },
});

const CtxSet ContextSetCfg::MmvdStepMvpIdx = ContextSetCfg::addCtxSet
({
  {  59, },
  {  60, },
  { CNU, },
  {   0, },
});

const CtxSet ContextSetCfg::PredMode = ContextSetCfg::addCtxSet
({
  {  40,  35, },
  {  40,  35, },
  { CNU, CNU, },
  {   5,   1, },
});

const CtxSet ContextSetCfg::MultiRefLineIdx = ContextSetCfg::addCtxSet
({
  {  25,  59, },
  {  25,  58, },
  {  25,  60, },
  {   5,   8, },
});

const CtxSet ContextSetCfg::IPredMode[] =
{
  ContextSetCfg::addCtxSet
  ({
    {  44, },
    {  36, },
    {  45, },
    {   6, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  25, },
    {  25, },
    {  34, },
    {   5, },
  })
};

const CtxSet ContextSetCfg::IntraLumaPlanarFlag = ContextSetCfg::addCtxSet
({
  {  13,   6, },
  {  12,  20, },
  {  13,  28, },
  {   1,   5, },
});

const CtxSet ContextSetCfg::CclmModeFlag = ContextSetCfg::addCtxSet
({
  {  26, },
  {  34, },
  {  59, },
  {   4, },
});

const CtxSet ContextSetCfg::CclmModeIdx = ContextSetCfg::addCtxSet
({
  {  27, },
  {  27, },
  {  27, },
  {   9, },
});

const CtxSet ContextSetCfg::MipFlag = ContextSetCfg::addCtxSet
({
  {  56,  57,  50,  26, },
  {  41,  57,  58,  26, },
  {  33,  49,  50,  25, },
  {   9,  10,   9,   6, },
});

const CtxSet ContextSetCfg::DeltaQP = ContextSetCfg::addCtxSet
({
  { CNU, CNU, },
  { CNU, CNU, },
  { CNU, CNU, },
  { DWS, DWS, },
});

const CtxSet ContextSetCfg::InterDir = ContextSetCfg::addCtxSet
({
  {  14,  13,   5,   4,   3,  40, },
  {   7,   6,   5,  12,   4,  40, },
  { CNU, CNU, CNU, CNU, CNU, CNU, },
  {   0,   0,   1,   4,   4,   0, },
});

const CtxSet ContextSetCfg::RefPic = ContextSetCfg::addCtxSet
({
  {   5,  35, },
  {  20,  35, },
  { CNU, CNU, },
  {   0,   4, },
});

const CtxSet ContextSetCfg::SubblockMergeFlag = ContextSetCfg::addCtxSet
({
  {  25,  58,  45, },
  {  48,  57,  44, },
  { CNU, CNU, CNU, },
  {   4,   4,   4, },
});

const CtxSet ContextSetCfg::AffineFlag = ContextSetCfg::addCtxSet
({
  {  19,  13,   6, },
  {  12,  13,  14, },
  { CNU, CNU, CNU, },
  {   4,   0,   0, },
});

const CtxSet ContextSetCfg::AffineType = ContextSetCfg::addCtxSet
({
  {  35, },
  {  35, },
  { CNU, },
  {   4, },
});

const CtxSet ContextSetCfg::AffMergeIdx = ContextSetCfg::addCtxSet
({
  {   4, },
  {   5, },
  { CNU, },
  {   0, },
});

const CtxSet ContextSetCfg::BcwIdx = ContextSetCfg::addCtxSet
({
  {   5, },
  {   4, },
  { CNU, },
  {   1, },
});

const CtxSet ContextSetCfg::Mvd = ContextSetCfg::addCtxSet
({
  {  51,  36, },
  {  44,  43, },
  {  14,  45, },
  {   9,   5, },
});

const CtxSet ContextSetCfg::BDPCMMode = ContextSetCfg::addCtxSet
({
  {  19,  21,   0,  28, },
  {  40,  36,   0,  13, },
  {  19,  35,   1,  27, },
  {   1,   4,   1,   0, },
});

const CtxSet ContextSetCfg::QtRootCbf = ContextSetCfg::addCtxSet
({
  {  12, },
  {   5, },
  {   6, },
  {   4, },
});

const CtxSet ContextSetCfg::ACTFlag = ContextSetCfg::addCtxSet
({
  {  46, },
  {  46, },
  {  52, },
  {   1, },
});

const CtxSet ContextSetCfg::QtCbf[] =
{
  ContextSetCfg::addCtxSet
  ({
    {  15,   6,   5,  14, },
    {  23,   5,  20,   7, },
    {  15,  12,   5,   7, },
    {   5,   1,   8,   9, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  25,  37, },
    {  25,  28, },
    {  12,  21, },
    {   5,   0, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {   9,  36,  45, },
    {  25,  29,  45, },
    {  33,  28,  36, },
    {   2,   1,   0, },
  })
};

const CtxSet ContextSetCfg::SigCoeffGroup[] =
{
  ContextSetCfg::addCtxSet
  ({
    {  25,  45, },
    {  25,  30, },
    {  18,  31, },
    {   8,   5, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  25,  14, },
    {  25,  45, },
    {  25,  15, },
    {   5,   8, },
  })
};

const CtxSet ContextSetCfg::SigFlag[] =
{
  ContextSetCfg::addCtxSet
  ({
    {  17,  41,  49,  36,   1,  49,  50,  37,  48,  51,  58,  45, },
    {  17,  41,  42,  29,  25,  49,  43,  37,  33,  58,  51,  30, },
    {  25,  19,  28,  14,  25,  20,  29,  30,  19,  37,  30,  38, },
    {  12,   9,   9,  10,   9,   9,   9,  10,   8,   8,   8,  10, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {   9,  49,  50,  36,  48,  59,  59,  38, },
    {  17,  34,  35,  21,  41,  59,  60,  38, },
    {  25,  27,  28,  37,  34,  53,  53,  46, },
    {  12,  12,   9,  13,   4,   5,   8,   9, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  26,  45,  53,  46,  49,  54,  61,  39,  35,  39,  39,  39, },
    {  19,  38,  38,  46,  34,  54,  54,  39,   6,  39,  39,  39, },
    {  11,  38,  46,  54,  27,  39,  39,  39,  44,  39,  39,  39, },
    {   9,  13,   8,   8,   8,   8,   8,   5,   8,   0,   0,   0, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  34,  45,  38,  31,  58,  39,  39,  39, },
    {  35,  45,  53,  54,  44,  39,  39,  39, },
    {  19,  46,  38,  39,  52,  39,  39,  39, },
    {   8,  12,  12,   8,   4,   0,   0,   0, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  19,  54,  39,  39,  50,  39,  39,  39,   0,  39,  39,  39, },
    {  19,  39,  54,  39,  19,  39,  39,  39,  56,  39,  39,  39, },
    {  18,  39,  39,  39,  27,  39,  39,  39,   0,  39,  39,  39, },
    {   8,   8,   8,   8,   8,   0,   4,   4,   0,   0,   0,   0, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  34,  38,  54,  39,  41,  39,  39,  39, },
    {  34,  38,  62,  39,  26,  39,  39,  39, },
    {  11,  39,  39,  39,  19,  39,  39,  39, },
    {   8,   8,   8,   8,   4,   0,   0,   0, },
  })
};

const CtxSet ContextSetCfg::ParFlag[] =
{
  ContextSetCfg::addCtxSet
  ({
    {  33,  40,  25,  41,  26,  42,  25,  33,  26,  34,  27,  25,  41,  42,  42,  35,  33,  27,  35,  42,  43, },
    {  18,  17,  33,  18,  26,  42,  25,  33,  26,  42,  27,  25,  34,  42,  42,  35,  26,  27,  42,  20,  20, },
    {  33,  25,  18,  26,  34,  27,  25,  26,  19,  42,  35,  33,  19,  27,  35,  35,  34,  42,  20,  43,  20, },
    {   8,   9,  12,  13,  13,  13,  10,  13,  13,  13,  13,  13,  13,  13,  13,  13,  10,  13,  13,  13,  13, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  33,  25,  26,  34,  19,  27,  33,  42,  43,  35,  43, },
    {  25,  25,  26,  11,  19,  27,  33,  42,  35,  35,  43, },
    {  33,  25,  26,  42,  19,  27,  26,  50,  35,  20,  43, },
    {   8,  12,  12,  12,  13,  13,  13,  13,  13,  13,  13, },
  })
};

const CtxSet ContextSetCfg::GtxFlag[] =
{
  ContextSetCfg::addCtxSet
  ({
    {  25,   0,   0,  17,  25,  26,   0,   9,  25,  33,  19,   0,  25,  33,  26,  20,  25,  33,  27,  35,  22, },
    {  17,   0,   1,  17,  25,  18,   0,   9,  25,  33,  34,   9,  25,  18,  26,  20,  25,  18,  19,  27,  29, },
    {  25,   1,  40,  25,  33,  11,  17,  25,  25,  18,   4,  17,  33,  26,  19,  13,  33,  19,  20,  28,  22, },
    {   1,   5,   9,   9,   9,   6,   5,   9,  10,  10,   9,   9,   9,   9,   9,   9,   6,   8,   9,   9,  10, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  25,   1,  25,  33,  26,  12,  25,  33,  27,  28,  37, },
    {  17,   9,  25,  10,  18,   4,  17,  33,  19,  20,  29, },
    {  40,   9,  25,  18,  26,  35,  25,  26,  35,  28,  37, },
    {   1,   5,   8,   8,   9,   6,   6,   9,   8,   8,   9, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {   0,   0,  33,  34,  35,  21,  25,  34,  35,  28,  29,  40,  42,  43,  29,  30,  49,  36,  37,  45,  38, },
    {   0,  17,  26,  19,  35,  21,  25,  34,  20,  28,  29,  33,  27,  28,  29,  22,  34,  28,  44,  37,  38, },
    {  25,  25,  11,  27,  20,  21,  33,  12,  28,  21,  22,  34,  28,  29,  29,  30,  36,  29,  45,  30,  23, },
    {   9,   5,  10,  13,  13,  10,   9,  10,  13,  13,  13,   9,  10,  10,  10,  13,   8,   9,  10,  10,  13, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {   0,  40,  34,  43,  36,  37,  57,  52,  45,  38,  46, },
    {   0,  25,  19,  20,  13,  14,  57,  44,  30,  30,  23, },
    {  40,  33,  27,  28,  21,  37,  36,  37,  45,  38,  46, },
    {   8,   8,   9,  12,  12,  10,   5,   9,   9,   9,  13, },
  })
};

const CtxSet ContextSetCfg::LastX[] =
{
  ContextSetCfg::addCtxSet
  ({
    {   6,   6,  12,  14,   6,   4,  14,   7,   6,   4,  29,   7,   6,   6,  12,  28,   7,  13,  13,  35, },
    {   6,  13,  12,   6,   6,  12,  14,  14,  13,  12,  29,   7,   6,  13,  36,  28,  14,  13,   5,  26, },
    {  13,   5,   4,  21,  14,   4,   6,  14,  21,  11,  14,   7,  14,   5,  11,  21,  30,  22,  13,  42, },
    {   8,   5,   4,   5,   4,   4,   5,   4,   1,   0,   4,   1,   0,   0,   0,   0,   1,   0,   0,   0, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  19,   5,   4, },
    {  12,   4,  18, },
    {  12,   4,   3, },
    {   5,   4,   4, },
  })
};

const CtxSet ContextSetCfg::LastY[] =
{
  ContextSetCfg::addCtxSet
  ({
    {   5,   5,  20,  13,  13,  19,  21,   6,  12,  12,  14,  14,   5,   4,  12,  13,   7,  13,  12,  41, },
    {   5,   5,  12,   6,   6,   4,   6,  14,   5,  12,  14,   7,  13,   5,  13,  21,  14,  20,  12,  34, },
    {  13,   5,   4,   6,  13,  11,  14,   6,   5,   3,  14,  22,   6,   4,   3,   6,  22,  29,  20,  34, },
    {   8,   5,   8,   5,   5,   4,   5,   5,   4,   0,   5,   4,   1,   0,   0,   1,   4,   0,   0,   0, },
  }),
  ContextSetCfg::addCtxSet
  ({
    {  11,   5,  27, },
    {  11,   4,  18, },
    {  12,   4,   3, },
    {   6,   5,   5, },
  })
};

const CtxSet ContextSetCfg::MVPIdx = ContextSetCfg::addCtxSet
({
  {  34, },
  {  34, },
  {  42, },
  {  12, },
});

const CtxSet ContextSetCfg::SmvdFlag = ContextSetCfg::addCtxSet
({
  {  28, },
  {  28, },
  { CNU, },
  {   5, },
});

const CtxSet ContextSetCfg::SaoMergeFlag = ContextSetCfg::addCtxSet
({
  {   2, },
  {  60, },
  {  60, },
  {   0, },
});

const CtxSet ContextSetCfg::SaoTypeIdx = ContextSetCfg::addCtxSet
({
  {   2, },
  {   5, },
  {  13, },
  {   4, },
});

const CtxSet ContextSetCfg::LFNSTIdx = ContextSetCfg::addCtxSet
({
  {  52,  37,  27, },
  {  37,  45,  27, },
  {  28,  52,  42, },
  {   9,   9,  10, },
});

const CtxSet ContextSetCfg::RdpcmFlag = ContextSetCfg::addCtxSet
({
  { CNU, CNU, },
  { CNU, CNU, },
  { CNU, CNU, },
  { DWS, DWS, },
});

const CtxSet ContextSetCfg::RdpcmDir = ContextSetCfg::addCtxSet
({
  { CNU, CNU, },
  { CNU, CNU, },
  { CNU, CNU, },
  { DWS, DWS, },
});

const CtxSet ContextSetCfg::MTSIndex = ContextSetCfg::addCtxSet
({
  {  45,  25,  27,   0,  25,   17, },
  {  45,  40,  27,   0,  25,    9, },
  {  29,   0,  28,   0,  25,    9, },
  {   8,   0,   9,   0,   1,    1, },
});

const CtxSet ContextSetCfg::ISPMode = ContextSetCfg::addCtxSet
({
  {  33,  43, },
  {  33,  36, },
  {  33,  43, },
  {   9,   2, },
});

const CtxSet ContextSetCfg::SbtFlag = ContextSetCfg::addCtxSet
({
  {  41,  57, },
  {  56,  57, },
  { CNU, CNU, },
  {   1,   5, },
});

const CtxSet ContextSetCfg::SbtQuadFlag = ContextSetCfg::addCtxSet
({
  {  42, },
  {  42, },
  { CNU, },
  {  10, },
});

const CtxSet ContextSetCfg::SbtHorFlag = ContextSetCfg::addCtxSet
({
  {  35,  51,  27, },
  {  20,  43,  12, },
  { CNU, CNU, CNU, },
  {   8,   4,   1, },
});

const CtxSet ContextSetCfg::SbtPosFlag = ContextSetCfg::addCtxSet
({
  {  28, },
  {  28, },
  { CNU, },
  {  13, },
});

const CtxSet ContextSetCfg::ChromaQpAdjFlag = ContextSetCfg::addCtxSet
({
  { CNU, },
  { CNU, },
  { CNU, },
  { DWS, },
});

const CtxSet ContextSetCfg::ChromaQpAdjIdc = ContextSetCfg::addCtxSet
({
  { CNU, },
  { CNU, },
  { CNU, },
  { DWS, },
});

const CtxSet ContextSetCfg::ImvFlag = ContextSetCfg::addCtxSet
({
  {  59,  26,  50,  60,  38, },
  {  59,  48,  58,  60,  60, },
  { CNU,  34, CNU, CNU, CNU, },
  {   0,   5,   0,   0,   4, },
});

const CtxSet ContextSetCfg::ctbAlfFlag = ContextSetCfg::addCtxSet
({
  {  33,  52,  46,  25,  61,  54,  25,  61,  54, },
  {  13,  23,  46,   4,  61,  54,  19,  46,  54, },
  {  62,  39,  39,  54,  39,  39,  31,  39,  39, },
  {   0,   0,   0,   4,   0,   0,   1,   0,   0, },
});

const CtxSet ContextSetCfg::ctbAlfAlternative = ContextSetCfg::addCtxSet
({
  {  11,  26, },
  {  20,  12, },
  {  11,  11, },
  {   0,   0, },
});

const CtxSet ContextSetCfg::AlfUseTemporalFilt = ContextSetCfg::addCtxSet
({
  {  46, },
  {  46, },
  {  46, },
  {   0, },
});

const CtxSet ContextSetCfg::CcAlfFilterControlFlag = ContextSetCfg::addCtxSet
({
  {  25,  35,  38,  25,  28,  38, },
  {  18,  21,  38,  18,  21,  38, },
  {  18,  30,  31,  18,  30,  31, },
  {   4,   1,   4,   4,   1,   4, },
});

const CtxSet ContextSetCfg::CiipFlag = ContextSetCfg::addCtxSet
({
  {  57, },
  {  57, },
  { CNU, },
  {   1, },
});

const CtxSet ContextSetCfg::IBCFlag = ContextSetCfg::addCtxSet
({
  {   0,  43,  45, },
  {   0,  57,  44, },
  {  17,  42,  36, },
  {   1,   5,   8, },
});

const CtxSet ContextSetCfg::JointCbCrFlag = ContextSetCfg::addCtxSet
({
  {  42,  43,  52, },
  {  27,  36,  45, },
  {  12,  21,  35, },
  {   1,   1,   0, },
});

const CtxSet ContextSetCfg::TsSigCoeffGroup = ContextSetCfg::addCtxSet
({
  {  18,  35,  45, },
  {  18,  12,  29, },
  {  18,  20,  38, },
  {   5,   8,   8, },
});

const CtxSet ContextSetCfg::TsSigFlag = ContextSetCfg::addCtxSet
({
  {  25,  50,  37, },
  {  40,  35,  44, },
  {  25,  28,  38, },
  {  13,  13,   8, },
});

const CtxSet ContextSetCfg::TsParFlag = ContextSetCfg::addCtxSet
({
  {  11, },
  {   3, },
  {  11, },
  {   6, },
});

const CtxSet ContextSetCfg::TsGtxFlag = ContextSetCfg::addCtxSet
({
  { CNU,   3,   4,   4,   5, },
  { CNU,   2,  10,   3,   3, },
  { CNU,  10,   3,   3,   3, },
  { DWS,   1,   1,   1,   1, },
});

const CtxSet ContextSetCfg::TsLrg1Flag = ContextSetCfg::addCtxSet
({
  {  19,  11,   4,   6, },
  {  18,  11,   4,  28, },
  {  11,   5,   5,  14, },
  {   4,   2,   1,   6, },
});

const CtxSet ContextSetCfg::TsResidualSign = ContextSetCfg::addCtxSet
({
  {  35,  25,  46,  28,  33,  38, },
  {   5,  10,  53,  43,  25,  46, },
  {  12,  17,  46,  28,  25,  46, },
  {   1,   4,   4,   5,   8,   8, },
});
// clang-format on

const unsigned ContextSetCfg::NumberOfContexts = (unsigned)ContextSetCfg::sm_InitTables[0].size();

// combined sets
const CtxSet ContextSetCfg::Sao = { ContextSetCfg::SaoMergeFlag, ContextSetCfg::SaoTypeIdx };

const CtxSet ContextSetCfg::Alf = { ContextSetCfg::ctbAlfFlag, ContextSetCfg::ctbAlfAlternative, ContextSetCfg::AlfUseTemporalFilt };


void Ctx::init(int qp, int initId)
{
  const auto& initTable = ContextSetCfg::getInitTable( initId );
  CHECK( m_CtxBuffer.size() != initTable.size(),
                     "Size of init table (" << initTable.size() << ") does not match size of context buffer (" << m_CtxBuffer.size() << ")." );

  const auto& rateInitTable = ContextSetCfg::getInitTable( NUMBER_OF_SLICE_TYPES );
  CHECK( m_CtxBuffer.size() != rateInitTable.size(),
                     "Size of rate init table (" << rateInitTable.size() << ") does not match size of context buffer (" << m_CtxBuffer.size() << ")." );

  const int clippedQP = Clip3( 0, MAX_QP, qp );
  for( std::size_t k = 0; k < m_CtxBuffer.size(); k++ )
  {
    m_CtxBuffer[k].init( clippedQP, initTable[k] );
    m_CtxBuffer[k].setLog2WindowSize( rateInitTable[k] );
  }
}

}
