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the Software are granted under this license.

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Copyright (c) 2019-2026, Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V. & The VVenC Authors.

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------------------------------------------------------------------------------------------- */

#ifndef __SEIFILMGRAINANALYZER__

#define __SEIFILMGRAINANALYZER__

#pragma once

#include "CommonLib/Picture.h"

#include "CommonLib/SEI.h"

#include <numeric>

#include <cmath>

#include <algorithm>

#include <fstream>  // Include this for std::ofstream

//using namespace vvenc;

namespace vvenc {

#if defined(TARGET_SIMD_X86)  && ENABLE_SIMD_OPT_FGA

using namespace x86_simd;

#endif

static constexpr double   PI                     = 3.14159265358979323846;

static constexpr double   PI_2                   = 3.14159265358979323846 / 2.0;

static constexpr double   pi_8                   = PI / 8.0;

static constexpr double   pi_3_8                 = 3.0 * PI / 8.0;

static constexpr double   pi_5_8                 = 5.0 * PI / 8.0;

static constexpr double   pi_7_8                 = 7.0 * PI / 8.0;

static constexpr int      DATA_BASE_SIZE         = 64;

static constexpr int      INTERVAL_SIZE          = 16;

static constexpr int      MAX_INTERVAL_NUMBER    = (1 << 16) / INTERVAL_SIZE;

static constexpr int      MAXPAIRS               = 256;

static constexpr int      KERNELSIZE             = 3;     // Dilation and erosion kernel size

static constexpr int      CONV_WIDTH_S           = 3;

static constexpr int      CONV_HEIGHT_S          = 3;

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

// Class definition

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

class Canny

{

public:

  Canny();

  ~Canny();

  unsigned int      m_convWidthG = 5, m_convHeightG = 5;      // Pixel's row and col positions for Gauss filtering

  void init ( unsigned int width,

              unsigned int height,

              ChromaFormat inputChroma );

  void destroy ();

  void detect_edges ( const PelStorage* orig,

                      PelStorage* dest,

                      unsigned int uiBitDepth,

                      ComponentID compID );

private:

  double            m_lowThresholdRatio   = 0.1;               // low threshold rato

  int               m_highThresholdRatio  = 3;                 // high threshold rato

  PelStorage *m_orientationBuf = nullptr;

  PelStorage* m_gradientBufX = nullptr;

  PelStorage* m_gradientBufY = nullptr;

  void suppressNonMax ( PelStorage* buff1,

                        PelStorage* buff2,

                        unsigned int width,

                        unsigned int height,

                        ComponentID compID );

  void doubleThreshold ( PelStorage *buff,

                         unsigned int width,

                         unsigned int height,

                         unsigned int bitDepth,

                         ComponentID compID );

  void edgeTracking ( PelStorage* buff1,

                      unsigned int width,

                      unsigned int height,

                      unsigned int windowWidth,

                      unsigned int windowHeight,

                      unsigned int bitDepth,

                      ComponentID compID );

  void (*gradient) ( PelStorage* buff1,

                     PelStorage* buff2,

                     PelStorage *tmpBuf1,

                     PelStorage *tmpBuf2,

                     unsigned int width,

                     unsigned int height,

                     unsigned int bitDepth,

                     ComponentID compID);

#if ENABLE_SIMD_OPT_FGA && defined( TARGET_SIMD_X86 )

  void initFGACannyX86();

  template <X86_VEXT vext>

  void _initFGACannyX86();

#endif

};

class Morph

{

public:

  Morph();

  ~Morph();

  void init ( uint32_t width,

              uint32_t height );

  void destroy ();

  int (*dilation) ( PelStorage *buff,

                    PelStorage *Wbuf,

                    uint32_t bitDepth,

                    ComponentID compID,

                    int numIter,

                    int iter,

                    Pel Value );

#if ENABLE_SIMD_OPT_FGA && defined( TARGET_SIMD_X86 )

  void initFGAMorphX86();

  template <X86_VEXT vext>

  void _initFGAMorphX86();

#endif

  PelStorage* m_dilationBuf = nullptr;

  PelStorage* m_dilationBuf2 = nullptr;

  PelStorage* m_dilationBuf4 = nullptr;

};

class FGAnalyzer

{

public:

  FGAnalyzer( bool enableOpt = true );

  ~FGAnalyzer();

  int                             prevAnalysisPoc                = -1;

  void init( const int                        width,

             const int                        height,

             const ChromaFormat               inputChroma,

             const int                        *outputBitDepths,

             const bool doAnalysis[] );

  void destroy        ();

  void estimateGrainParameters ( Picture* pic );

  int getLog2scaleFactor()  { return m_log2ScaleFactor; };

  SeiFgc::CompModel  getCompModel( int idx ) { return m_compModel[idx];  };

  double (*calcVar) ( const Pel* org,

                      const ptrdiff_t origStride,

                      const int w,

                      const int h );

  int (*calcMean) ( const Pel* org,

                    const ptrdiff_t origStride,

                    const int w,

                    const int h );

  void (*fastDCT2_64) ( const TCoeff* src,

                        TCoeff* dst,

                        int shift,

                        int line,

                        int iSkipLine,

                        int iSkipLine2 );

private:

  int                             *m_bitDepths;

  ChromaFormat                    m_inputChromaFormat;

  bool                            m_doAnalysis[ComponentID::MAX_NUM_COMP] = { true, true, true };

  Canny                           m_edgeDetector;

  Morph                           m_morphOperation;

  double                          m_lowIntensityRatio            = 0.1;           // supress everything below 0.1*maxIntensityOffset

  CoeffBuf                        * m_dctGrainBlockList;

  TCoeff                          * m_coeffBuf;

  int                             m_numDctGrainBlocks;

  std::vector<double>             coeffs;

  std::vector<double>             scalingVec;

  std::vector<int>                quantVec;

  std::vector<int>                vecMean;

  std::vector<int>                vecVar;

  double                          meanSquaredDctGrain[DATA_BASE_SIZE][DATA_BASE_SIZE];

  /* Interval points for fitFunction */

  std::vector<int>                vec_mean_intensity;

  std::vector<int>                vec_variance_intensity;

  std::vector<int>                element_number_per_interval;

  std::vector<int>                tmp_data_x;

  std::vector<int>                tmp_data_y;

  static constexpr double         m_tapFilter[3]                = { 1, 2, 1 };

  static constexpr double         m_normTap                     = 4.0;

  // fg model parameters

  int                             m_log2ScaleFactor;

  std::vector<std::array<int, 3>> finalIntervalsandScalingFactors;   // lower_bound, upper_bound, scaling_factor

  SeiFgc::CompModel               m_compModel[ComponentID::MAX_NUM_COMP];

  const PelStorage                *m_originalBuf             = nullptr;

  const PelStorage                *m_workingBuf              = nullptr;

  PelStorage                      *m_maskBuf                 = nullptr;

  PelStorage                      *m_grainEstimateBuf        = nullptr;

  PelStorage                      *m_workingBufSubsampled2   = nullptr;

  PelStorage                      *m_maskSubsampled2         = nullptr;

  PelStorage                      *m_workingBufSubsampled4   = nullptr;

  PelStorage                      *m_maskSubsampled4         = nullptr;

  PelStorage                      *m_maskUpsampled           = nullptr;

  // for DCT

  TCoeff                          *m_DCTinout                = nullptr;

  TCoeff                          *m_DCTtemp                 = nullptr;

  void findMask ( ComponentID compID );

  void blockTransform ( CoeffBuf& currentCoeffBuf,

                        int offsetX,

                        int offsetY,

                        uint32_t bitDepth,

                        ComponentID compId );

  void adaptiveSampling ( int bins,

                          double threshold,

                          std::vector<int>& significantIndices,

                          bool isRow,

                          int startIdx );

  void estimateCutoffFreqAdaptive ( ComponentID compID );

  void estimateScalingFactors ( uint32_t bitDepth,

                                ComponentID compID );

  bool fitFunction ( int order,

                     int bitDepth,

                     bool second_pass );

  void avgScalingVec ( int bitDepth );

  bool lloydMax ( double& distortion,

                  int bitDepth );

  void quantize ( std::vector<double>& quantizedVec,

                  double& distortion,

                  double partition[],

                  double codebook[] );

  void extendPoints ( int bitDepth );

  void setEstimatedParameters ( uint32_t bitDepth,

                                ComponentID compID );

  void defineIntervalsAndScalings ( int bitDepth );

  void scaleDown ( int bitDepth );

  void confirmIntervals ( );

  long double ldpow ( long double n,

                      unsigned p );

  int countEdges ( int windowSize,

                   int offsetX,

                   int offsetY,

                   ComponentID compID );

  void subsample ( PelStorage& output,

                   const int factor = 2,

                   const int padding = 0, 

                   ComponentID compID = COMP_Y ) const;

  void upsample ( const PelStorage& input,

                  const int factor = 2,

                  const int padding = 0,

                  ComponentID compID = COMP_Y ) const;

  void combineMasks ( ComponentID compId );

  void suppressLowIntensity ( const PelStorage& buff1,

                              PelStorage& buff2,

                              uint32_t bitDepth,

                              ComponentID compId );

#if ENABLE_SIMD_OPT_FGA && defined( TARGET_SIMD_X86 )

  void initFGAnalyzerX86();

  template <X86_VEXT vext>

  void _initFGAnalyzerX86();

#endif

#if ENABLE_SIMD_OPT_FGA && defined( TARGET_SIMD_ARM )

  void initFGAnalyzerARM();

  template <ARM_VEXT vext>

  void _initFGAnalyzerARM();

#endif

};

} // namespace vvenc

#endif // __SEIFILMGRAINANALYZER__