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/* This file is based on VFGS, available on

 * https://github.com/InterDigitalInc/VersatileFilmGrain

 *

 * VFGS implements film grain synthesis as a hardware model: it simulates the

 * output of a cost-effective hardware implementation in a video display

 * pipeline. Also, the C code is split into "fw" (firmware) and "hw" (hardware)

 * parts, and as self-explanatory as possible. See VFGS github repository for

 * more details.

 *

 * The VFGS github repository also contains other tools to experiment with film

 * grain synthesis (e.g. a graphical display and tuning tool for FGC SEI

 * message).

 */

#pragma once

#include "FilmGrainImpl.h"

#include <cstring>

#include <vector>

#include <memory>

#include "vvdec/sei.h"

#include "vvdec/vvdec.h"

namespace vvdec

{

#define SEI_MAX_MODEL_VALUES 6

struct fgs_sei

{

  fgs_sei() { memset( this, 0, sizeof( *this ) ); }

  uint8_t  model_id;

  uint8_t  log2_scale_factor;

  uint8_t  comp_model_present_flag[3];

  uint16_t num_intensity_intervals[3];

  uint8_t  num_model_values[3];

  uint8_t  intensity_interval_lower_bound[3][256];

  uint8_t  intensity_interval_upper_bound[3][256];

  int16_t  comp_model_value[3][256][SEI_MAX_MODEL_VALUES];

};

class FilmGrain

{

  std::unique_ptr<FilmGrainImpl> m_impl;

  uint32_t m_line_rnd               = 0xdeadbeef;

  uint32_t m_line_rnd_up            = 0xdeadbeef;

  uint32_t m_prev_frame_line_rnd_up = 0xdeadbeef;

  std::vector<uint32_t> m_line_seeds;

  fgs_sei               fgs;

public:

  FilmGrain();

  ~FilmGrain() = default;

  void updateFGC( vvdecSEIFilmGrainCharacteristics* fgc );

  void setDepth( int depth ) { m_impl->set_depth( depth ); }

  void setColorFormat( vvdecColorFormat fmt );

  void prepareBlockSeeds( int width, int height );

  void add_grain_line( void* Y, void* U, void* V, int y, int width );

private:

  void set_seed( uint32_t seed );

  void init_sei();

};

}   // namespace vvdec