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/** \file     TrQuant.cpp

    \brief    transform and quantization class

*/

#include "TrQuant.h"

#include "TrQuant_EMT.h"

#include "UnitTools.h"

#include "ContextModelling.h"

#include "CodingStructure.h"

#include "TimeProfiler.h"

#include "Quant.h"

#include "InterPrediction.h"

#include "dtrace_buffer.h"

#include <stdlib.h>

#include <limits>

#include <memory.h>

#include "Quant.h"

namespace vvdec

{

InvTrans *fastInvTrans[NUM_TRANS_TYPE][g_numTransformMatrixSizes] =

{

  { fastInverseDCT2_B2, fastInverseDCT2_B4, fastInverseDCT2_B8, fastInverseDCT2_B16, fastInverseDCT2_B32, fastInverseDCT2_B64 },

  { nullptr,            fastInverseDCT8_B4, fastInverseDCT8_B8, fastInverseDCT8_B16, fastInverseDCT8_B32, nullptr },

  { nullptr,            fastInverseDST7_B4, fastInverseDST7_B8, fastInverseDST7_B16, fastInverseDST7_B32, nullptr },

};

//! \ingroup CommonLib

//! \{

static void invLfnstNxNCore( int* src, int* dst, const uint32_t mode, const uint32_t index, const uint32_t size, int zeroOutSize )

{

  int             maxLog2TrDynamicRange =  15;

  const TCoeff    outputMinimum         = -( 1 << maxLog2TrDynamicRange );

  const TCoeff    outputMaximum         =  ( 1 << maxLog2TrDynamicRange ) - 1;

  const int8_t*   trMat                 =  ( size > 4 ) ? g_lfnst8x8[ mode ][ index ][ 0 ] : g_lfnst4x4[ mode ][ index ][ 0 ];

  const int       trSize                =  ( size > 4 ) ? 48 : 16;

  int             resi;

  int*            out                   =  dst;

  CHECK( index > 2, "wrong" );

  for( int j = 0; j < trSize; j++, trMat += 16 )

  {

    resi = 0;

    const int8_t* trMatTmp = trMat;

    int*          srcPtr   = src;

    for( int i = 0; i < zeroOutSize; i++ )

    {

      resi += *srcPtr++ * *trMatTmp++;

    }

    *out++ = Clip3( outputMinimum, outputMaximum, ( int ) ( resi + 64 ) >> 7 );

  }

}

static inline int64_t square( const int d ) { return d * (int64_t)d; }

template<int signedMode> void invTransformCbCr( PelBuf &resCb, PelBuf &resCr )

{

  Pel*  cb  = resCb.buf;

  Pel*  cr  = resCr.buf;

  for( SizeType y = 0; y < resCb.height; y++, cb += resCb.stride, cr += resCr.stride )

  {

    for( SizeType x = 0; x < resCb.width; x++ )

    {

      if      ( signedMode ==  1 )  { cr[x] =  cb[x] >> 1;  }

      else if ( signedMode == -1 )  { cr[x] = -cb[x] >> 1;  }

      else if ( signedMode ==  2 )  { cr[x] =  cb[x]; }

      else if ( signedMode == -2 )  { cr[x] = -cb[x]; }

      else if ( signedMode ==  3 )  { cb[x] =  cr[x] >> 1; }

      else if ( signedMode == -3 )  { cb[x] = -cr[x] >> 1; }

    }

  }

}

Unexecuted instantiation: void vvdec::invTransformCbCr<0>(vvdec::AreaBuf<short>&, vvdec::AreaBuf<short>&)

Unexecuted instantiation: void vvdec::invTransformCbCr<1>(vvdec::AreaBuf<short>&, vvdec::AreaBuf<short>&)

Unexecuted instantiation: void vvdec::invTransformCbCr<-1>(vvdec::AreaBuf<short>&, vvdec::AreaBuf<short>&)

Unexecuted instantiation: void vvdec::invTransformCbCr<2>(vvdec::AreaBuf<short>&, vvdec::AreaBuf<short>&)

Unexecuted instantiation: void vvdec::invTransformCbCr<-2>(vvdec::AreaBuf<short>&, vvdec::AreaBuf<short>&)

Unexecuted instantiation: void vvdec::invTransformCbCr<3>(vvdec::AreaBuf<short>&, vvdec::AreaBuf<short>&)

Unexecuted instantiation: void vvdec::invTransformCbCr<-3>(vvdec::AreaBuf<short>&, vvdec::AreaBuf<short>&)

// ====================================================================================================================

// TrQuant class member functions

// ====================================================================================================================

TrQuant::TrQuant( class InterPrediction* ip, const TrQuant* other ) : Quant( other )

{

  // allocate temporary buffers

  m_invICT      = m_invICTMem + maxAbsIctMode;

  m_invICT[ 0]  = invTransformCbCr< 0>;

  m_invICT[ 1]  = invTransformCbCr< 1>;

  m_invICT[-1]  = invTransformCbCr<-1>;

  m_invICT[ 2]  = invTransformCbCr< 2>;

  m_invICT[-2]  = invTransformCbCr<-2>;

  m_invICT[ 3]  = invTransformCbCr< 3>;

  m_invICT[-3]  = invTransformCbCr<-3>;

  m_invLfnstNxN = invLfnstNxNCore;

  static_assert( sizeof( ip->m_acYuvPred[0] ) > sizeof( TCoeff ) * ( MAX_TU_SIZE_FOR_PROFILE * MAX_TU_SIZE_FOR_PROFILE + MEMORY_ALIGN_DEF_SIZE ), "Buffer to small to be reused!" );

  static_assert( sizeof( ip->m_acYuvPred[1] ) > sizeof( TCoeff ) * ( MAX_TU_SIZE_FOR_PROFILE * MAX_TU_SIZE_FOR_PROFILE + MEMORY_ALIGN_DEF_SIZE ), "Buffer to small to be reused!" );

  static_assert( sizeof( ip->m_acYuvPred[2] ) > sizeof( TCoeff ) * ( MAX_TU_SIZE_FOR_PROFILE * MAX_TU_SIZE_FOR_PROFILE + MEMORY_ALIGN_DEF_SIZE ), "Buffer to small to be reused!" );

  char* tmp  = ( char* ) ip->m_acYuvPred[0];

  char* blk  = ( char* ) ip->m_acYuvPred[1];

  char* dqnt = ( char* ) ip->m_acYuvPred[2];

  m_tmp  = ( TCoeff* ) ( ( ptrdiff_t ) tmp  + ( MEMORY_ALIGN_DEF_SIZE - ( ( ptrdiff_t ) tmp  & ( MEMORY_ALIGN_DEF_SIZE - 1 ) ) ) );

  m_blk  = ( TCoeff* ) ( ( ptrdiff_t ) blk  + ( MEMORY_ALIGN_DEF_SIZE - ( ( ptrdiff_t ) blk  & ( MEMORY_ALIGN_DEF_SIZE - 1 ) ) ) );

  m_dqnt = ( TCoeff* ) ( ( ptrdiff_t ) dqnt + ( MEMORY_ALIGN_DEF_SIZE - ( ( ptrdiff_t ) dqnt & ( MEMORY_ALIGN_DEF_SIZE - 1 ) ) ) );

#if defined( TARGET_SIMD_X86 ) && ENABLE_SIMD_TCOEFF_OPS

  initTrQuantX86();

#endif

}

void TrQuant::xDeQuant(const TransformUnit &tu,

                             CoeffBuf      &dstCoeff,

                       const ComponentID   &compID,

                       const QpParam       &cQP)

{

  PROFILER_SCOPE_AND_STAGE_EXT( 1, g_timeProfiler, P_PARSERESIDUALS, *tu.cu->cs, compID );

  dequant( tu, dstCoeff, compID, cQP );

}

void TrQuant::init( const Picture *pic )

{

  Quant::init( pic );

}

uint32_t TrQuant::getLFNSTIntraMode( int wideAngPredMode )

{

  uint32_t intraMode;

  if( wideAngPredMode < 0 )

  {

    intraMode = ( uint32_t ) ( wideAngPredMode + ( NUM_EXT_LUMA_MODE >> 1 ) + NUM_LUMA_MODE );

  }

  else if( wideAngPredMode >= NUM_LUMA_MODE )

  {

    intraMode = ( uint32_t ) ( wideAngPredMode + ( NUM_EXT_LUMA_MODE >> 1 ) );

  }

  else

  {

    intraMode = ( uint32_t ) wideAngPredMode;

  }

  return intraMode;

}

bool TrQuant::getTransposeFlag( uint32_t intraMode )

{

  return ( ( intraMode >= NUM_LUMA_MODE ) && ( intraMode >= ( NUM_LUMA_MODE + ( NUM_EXT_LUMA_MODE >> 1 ) ) ) ) ||

         ( ( intraMode <  NUM_LUMA_MODE ) && ( intraMode >  DIA_IDX ) );

}

void TrQuant::xInvLfnst( TransformUnit &tu, const ComponentID& compID )

{

  const CompArea& area     = tu.blocks[ compID ];

  const uint32_t  width    = area.width;

  const uint32_t  height   = area.height;

  const uint32_t  lfnstIdx = tu.cu->lfnstIdx();

  if( lfnstIdx && tu.mtsIdx( compID ) != MTS_SKIP && ( CU::isSepTree( *tu.cu ) ? true : isLuma( compID ) ) )

  {

    const bool whge3     = width >= 8 && height >= 8;

    const uint16_t* scan = whge3 ? g_coefTopLeftDiagScan8x8[ g_sizeIdxInfo.idxFrom( width ) ] : g_scanOrder[ SCAN_GROUPED_4x4 ][ g_sizeIdxInfo.idxFrom( width ) ][ g_sizeIdxInfo.idxFrom( height ) ];

    uint32_t intraMode   = 0;

    if( CU::isMIP( *tu.cu, toChannelType( compID ) ) )

    {

      intraMode = PLANAR_IDX;

    }

    else

    {

      intraMode = PU::isLMCMode( tu.cu->intraDir[toChannelType( compID )] ) ? PU::getCoLocatedIntraLumaMode( *tu.cu ) : PU::getFinalIntraMode( *tu.cu, toChannelType( compID ) );

    }

    CHECKD( intraMode > NUM_INTRA_MODE, "Invalid intra mode" );

    CHECKD( lfnstIdx >= 3, "Invalid LFNST index" );

    intraMode                     = getLFNSTIntraMode( PU::getWideAngIntraMode( tu, intraMode, compID ) );

    bool          transposeFlag   = getTransposeFlag( intraMode );

    const int     sbSize          = whge3 ? 8 : 4;

    bool          tu4x4Flag       = ( width == 4 && height == 4 );

    bool          tu8x8Flag       = ( width == 8 && height == 8 );

    TCoeff*       lfnstTemp;

    TCoeff*       coeffTemp;

    int y;

    lfnstTemp = m_tempInMatrix; // inverse spectral rearrangement

    coeffTemp = m_dqnt;

    TCoeff * dst = lfnstTemp;

    for( y = 0; y < 16; y++ )

    {

      *dst++ = coeffTemp[ scan[y] ];

    }

    m_invLfnstNxN( m_tempInMatrix, m_tempOutMatrix, g_lfnstLut[ intraMode ], lfnstIdx - 1, sbSize, ( tu4x4Flag || tu8x8Flag ) ? 8 : 16 );

    lfnstTemp = m_tempOutMatrix; // inverse spectral rearrangement

    if( transposeFlag )

    {

      if( sbSize == 4 )

      {

        for( y = 0; y < 4; y++ )

        {

          coeffTemp[ 0 ] = lfnstTemp[ 0 ];  coeffTemp[ 1 ] = lfnstTemp[  4 ];

          coeffTemp[ 2 ] = lfnstTemp[ 8 ];  coeffTemp[ 3 ] = lfnstTemp[ 12 ];

          lfnstTemp++;

          coeffTemp += width;

        }

      }

      else // ( sbSize == 8 )

      {

        for( y = 0; y < 8; y++ )

        {

          coeffTemp[ 0 ] = lfnstTemp[  0 ];  coeffTemp[ 1 ] = lfnstTemp[  8 ];

          coeffTemp[ 2 ] = lfnstTemp[ 16 ];  coeffTemp[ 3 ] = lfnstTemp[ 24 ];

          if( y < 4 )

          {

            coeffTemp[ 4 ] = lfnstTemp[ 32 ];  coeffTemp[ 5 ] = lfnstTemp[ 36 ];

            coeffTemp[ 6 ] = lfnstTemp[ 40 ];  coeffTemp[ 7 ] = lfnstTemp[ 44 ];

          }

          lfnstTemp++;

          coeffTemp += width;

        }

      }

    }

    else

    {

      for( y = 0; y < sbSize; y++ )

      {

        uint32_t uiStride = ( y < 4 ) ? sbSize : 4;

        ::memcpy( coeffTemp, lfnstTemp, uiStride * sizeof( TCoeff ) );

        lfnstTemp += uiStride;

        coeffTemp += width;

      }

    }

    tu.maxScanPosX[compID] = std::max<int>( tu.maxScanPosX[compID], std::min<int>( width  - 1, 7 ) );

    tu.maxScanPosY[compID] = std::max<int>( tu.maxScanPosY[compID], std::min<int>( height - 1, 7 ) );

  }

}

void TrQuant::invTransformNxN( TransformUnit &tu, const ComponentID &compID, PelBuf &pResi, const QpParam &cQP )

{

  CompArea &area    = tu.blocks[compID];

  uint32_t uiWidth  = area.width;

  uint32_t uiHeight = area.height;

  CoeffBuf coeff( m_dqnt, uiWidth, uiHeight );

  coeff.memset( 0 );

  xDeQuant( tu, coeff, compID, cQP );

  DTRACE_COEFF_BUF( D_TCOEFF, coeff, tu, tu.cu->predMode(), compID );

  if( tu.cu->sps->getUseLFNST() )

  {

    xInvLfnst( tu, compID );

  }

  if( tu.mtsIdx( compID )== 1 )

  {

    xITransformSkip( coeff, pResi, tu, compID );

  }

  else

  {

    xIT( tu, compID, coeff, pResi );

  }

  DTRACE_PEL_BUF( D_RESIDUALS, pResi, tu, tu.cu->predMode(), compID);

}

void TrQuant::invTransformICT( const TransformUnit &tu, PelBuf &resCb, PelBuf &resCr )

{

  CHECKD( Size(resCb) != Size(resCr), "resCb and resCr have different sizes" );

  ( *m_invICT[TU::getICTMode( tu, tu.cu->cs->picHeader->getJointCbCrSignFlag() )] )( resCb, resCr );

}

// ------------------------------------------------------------------------------------------------

// Logical transform

// ------------------------------------------------------------------------------------------------

void TrQuant::getTrTypes( const TransformUnit& tu, const ComponentID compID, int &trTypeHor, int &trTypeVer )

{

  const bool isCuIntra     = CU::isIntra( *tu.cu );

  const bool isCompLuma    = isLuma( compID );

  const bool isImplicitMTS = isCuIntra && isCompLuma && tu.cu->sps->getUseImplicitMTS() && tu.cu->lfnstIdx() == 0 && tu.cu->mipFlag() == 0;

  const bool isISP         = isCuIntra && isCompLuma && tu.cu->ispMode();

  if( isISP && tu.cu->lfnstIdx() )

  {

    return;

  }

  const int lwidth  = tu.lwidth();

  const int lheight = tu.lheight();

  if( !tu.cu->sps->getUseMTS() )

    return;

  if( isImplicitMTS || isISP )

  {

    bool widthDstOk   = lwidth  >= 4 && lwidth  <= 16;

    bool heightDstOk  = lheight >= 4 && lheight <= 16;

    if( widthDstOk )

      trTypeHor = DST7;

    if( heightDstOk )

      trTypeVer = DST7;

    return;

  }

  const bool isCuInter     = CU::isInter( *tu.cu ) && isCompLuma;

  const bool isExplicitMTS = isCuIntra ? tu.cu->sps->getUseIntraMTS() && isCompLuma : tu.cu->sps->getUseInterMTS() && isCuInter;

  const bool isSBT         = isCuInter && tu.cu->sbtInfo();

  if( isSBT )

  {

    const uint8_t sbtIdx = CU::getSbtIdx( *tu.cu );

    const uint8_t sbtPos = CU::getSbtPos( *tu.cu );

    if( sbtIdx == SBT_VER_HALF || sbtIdx == SBT_VER_QUAD )

    {

      CHECK( lwidth > MTS_INTER_MAX_CU_SIZE, "wrong" );

      if( lheight > MTS_INTER_MAX_CU_SIZE )

      {

        trTypeHor = trTypeVer = DCT2;

      }

      else

      {

        if( sbtPos == SBT_POS0 )  { trTypeHor = DCT8;  trTypeVer = DST7; }

        else                      { trTypeHor = DST7;  trTypeVer = DST7; }

      }

    }

    else

    {

      CHECK( lheight > MTS_INTER_MAX_CU_SIZE, "wrong" );

      if( lwidth > MTS_INTER_MAX_CU_SIZE )

      {

        trTypeHor = trTypeVer = DCT2;

      }

      else

      {

        if( sbtPos == SBT_POS0 )  { trTypeHor = DST7;  trTypeVer = DCT8; }

        else                      { trTypeHor = DST7;  trTypeVer = DST7; }

      }

    }

    return;

  }

  else if( isExplicitMTS )

  {

    if (tu.mtsIdx( compID ) > MTS_SKIP)

    {

      int indHor = (tu.mtsIdx( compID ) - MTS_DST7_DST7) & 1;

      int indVer = (tu.mtsIdx( compID ) - MTS_DST7_DST7) >> 1;

      trTypeHor = indHor ? DCT8 : DST7;

      trTypeVer = indVer ? DCT8 : DST7;

    }

  }

}

void TrQuant::xIT( const TransformUnit &tu, const ComponentID &compID, const CCoeffBuf &pCoeff, PelBuf &pResidual )

{

  const int      width                  = pCoeff.width;

  const int      height                 = pCoeff.height;

  const unsigned maxLog2TrDynamicRange  = tu.cu->sps->getMaxLog2TrDynamicRange( toChannelType( compID ) );

  const unsigned bitDepth               = tu.cu->sps->getBitDepth();

  const int      TRANSFORM_MATRIX_SHIFT = g_transformMatrixShift;

  const TCoeff   clipMinimum            = -( 1 << maxLog2TrDynamicRange );

  const TCoeff   clipMaximum            =  ( 1 << maxLog2TrDynamicRange ) - 1;

  const uint32_t transformWidthIndex    = getLog2(width ) - 1;                                // nLog2WidthMinus1, since transform start from 2-point

  const uint32_t transformHeightIndex   = getLog2(height) - 1;                                // nLog2HeightMinus1, since transform start from 2-point

  int trTypeHor = DCT2;

  int trTypeVer = DCT2;

  getTrTypes( tu, compID, trTypeHor, trTypeVer );

  if( tu.maxScanPosX[compID] == 0 && tu.maxScanPosY[compID] == 0 && trTypeHor == DCT2 && trTypeVer == DCT2 )

  {

    int dcVal = 0;

    if( width > 1 && height > 1 )

    {

      const int shift_1st = TRANSFORM_MATRIX_SHIFT + 1 + COM16_C806_TRANS_PREC;

      const int shift_2nd = ( TRANSFORM_MATRIX_SHIFT + maxLog2TrDynamicRange - 1 ) - bitDepth + COM16_C806_TRANS_PREC;

      dcVal = ( ( pCoeff.buf[0] * ( 1 << TRANSFORM_MATRIX_SHIFT ) ) + ( 1 << ( shift_1st - 1 ) ) ) >> shift_1st;

      dcVal = ( ( dcVal * ( 1 << TRANSFORM_MATRIX_SHIFT ) ) + ( 1 << ( shift_2nd - 1 ) ) ) >> shift_2nd;

    }

    else

    {

      const int shift = ( TRANSFORM_MATRIX_SHIFT + maxLog2TrDynamicRange ) - bitDepth + COM16_C806_TRANS_PREC;

      dcVal = ( ( pCoeff.buf[0] * ( 1 << TRANSFORM_MATRIX_SHIFT ) ) + ( 1 << ( shift - 1 ) ) ) >> shift;

    }

    pResidual.fill( dcVal );

    return;

  }

  const int skipWidth  = std::max<int>( ( trTypeHor != DCT2 && width  == 32 ) ? 16 : width  > JVET_C0024_ZERO_OUT_TH ? width  - JVET_C0024_ZERO_OUT_TH : 0, width  - tu.maxScanPosX[compID] - 1 );

  const int skipHeight = std::max<int>( ( trTypeVer != DCT2 && height == 32 ) ? 16 : height > JVET_C0024_ZERO_OUT_TH ? height - JVET_C0024_ZERO_OUT_TH : 0, height - tu.maxScanPosY[compID] - 1 );

  TCoeff *block = m_blk;

  int shiftlast;

  if( width > 1 && height > 1 ) //2-D transform

  {

    const int      shift_1st              =   TRANSFORM_MATRIX_SHIFT + 1 + COM16_C806_TRANS_PREC; // 1 has been added to shift_1st at the expense of shift_2nd

    const int      shift_2nd              = ( TRANSFORM_MATRIX_SHIFT + maxLog2TrDynamicRange - 1 ) - bitDepth + COM16_C806_TRANS_PREC;

    CHECK( shift_1st < 0, "Negative shift" );

    CHECK( shift_2nd < 0, "Negative shift" );

    TCoeff *tmp   = m_tmp;

    fastInvTrans[trTypeVer][transformHeightIndex](pCoeff.buf, tmp, shift_1st, width, skipWidth, skipHeight, true,  clipMinimum, clipMaximum);

    fastInvTrans[trTypeHor][transformWidthIndex] (tmp,      block, shift_2nd, height,         0, skipWidth, false, clipMinimum, clipMaximum);

    shiftlast = shift_2nd;

  }

  else if( width == 1 ) //1-D vertical transform

  {

    int shift = ( TRANSFORM_MATRIX_SHIFT + maxLog2TrDynamicRange - 1 ) - bitDepth + COM16_C806_TRANS_PREC;

    CHECK( shift < 0, "Negative shift" );

    CHECK( ( transformHeightIndex < 0 ), "There is a problem with the height." );

    fastInvTrans[trTypeVer][transformHeightIndex]( pCoeff.buf, block, shift + 1, 1, 0, skipHeight, false, clipMinimum, clipMaximum );

    shiftlast = shift + 1;

  }

  else //if(iHeight == 1) //1-D horizontal transform

  {

    const int      shift              = ( TRANSFORM_MATRIX_SHIFT + maxLog2TrDynamicRange - 1 ) - bitDepth + COM16_C806_TRANS_PREC;

    CHECK( shift < 0, "Negative shift" );

    CHECK( ( transformWidthIndex < 0 ), "There is a problem with the width." );

    fastInvTrans[trTypeHor][transformWidthIndex]( pCoeff.buf, block, shift + 1, 1, 0, skipWidth, false, clipMinimum, clipMaximum );

    shiftlast = shift + 1;

  }

  int round = 1 << ( shiftlast - 1 );

  g_tCoeffOps.cpyResiClip[getLog2( width )]( block, pResidual.buf, pResidual.stride, width, height, clipMinimum, clipMaximum, round, shiftlast );

}

/** Wrapper function between HM interface and core NxN transform skipping

 */

void TrQuant::xITransformSkip(const CCoeffBuf     &pCoeff,

                                    PelBuf        &pResidual,

                              const TransformUnit &tu,

                              const ComponentID   &compID)

{

  const CompArea &area  = tu.blocks[compID];

  const int width       = area.width;

  const int height      = area.height;

  for( int y = 0; y < height; y++ )

  {

    for( int x = 0; x < width; x++ )

    {

      pResidual.at( x, y ) = Pel( pCoeff.at( x, y ) );

    }

  }

}

}