/*
  * Original MPlayer filters by Richard Felker, Hampa Hug, Daniel Moreno,
  * and Michael Niedermeyer.
  *
  * Copyright (c) 2014 James Darnley <james.darnley@gmail.com>
  * Copyright (c) 2015 Arwa Arif <arwaarif1994@gmail.com>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #ifndef AVFILTER_EQ_H
 #define AVFILTER_EQ_H
 
 #include "avfilter.h"

 #include "libavutil/eval.h"
 

 static const char *const var_names[] = {
     "n",   // frame count
     "pos", // frame position
     "r",   // frame rate
     "t",   // timestamp expressed in seconds

     NULL
 };
 
 enum var_name {

     VAR_N,
     VAR_POS,
     VAR_R,
     VAR_T,
     VAR_NB

 };

 
 typedef struct EQParameters {
     void (*adjust)(struct EQParameters *eq, uint8_t *dst, int dst_stride,

                    const uint8_t *src, int src_stride, int w, int h);

 
     uint8_t lut[256];
 
     double brightness, contrast, gamma, gamma_weight;
     int lut_clean;

 } EQParameters;
 

 typedef struct EQContext {

     const AVClass *class;
 
     EQParameters param[3];
 

     char   *contrast_expr;
     AVExpr *contrast_pexpr;

     double  contrast;

 
     char   *brightness_expr;
     AVExpr *brightness_pexpr;

     double  brightness;

 
     char   *saturation_expr;
     AVExpr *saturation_pexpr;

     double  saturation;

 
     char   *gamma_expr;
     AVExpr *gamma_pexpr;

     double  gamma;

 
     char   *gamma_weight_expr;
     AVExpr *gamma_weight_pexpr;

     double  gamma_weight;

 
     char   *gamma_r_expr;
     AVExpr *gamma_r_pexpr;

     double  gamma_r;

 
     char   *gamma_g_expr;
     AVExpr *gamma_g_pexpr;

     double  gamma_g;

 
     char   *gamma_b_expr;
     AVExpr *gamma_b_pexpr;

     double  gamma_b;

     double var_values[VAR_NB];

 
     void (*process)(struct EQParameters *par, uint8_t *dst, int dst_stride,

                     const uint8_t *src, int src_stride, int w, int h);

     enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode;

 } EQContext;
 
 void ff_eq_init_x86(EQContext *eq);
 
 #endif /* AVFILTER_EQ_H */