/*
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser 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_FRAMERATE_H
 #define AVFILTER_FRAMERATE_H
 
 #include "libavutil/pixelutils.h"
 #include "avfilter.h"
 
 #define BLEND_FUNC_PARAMS const uint8_t *src1, ptrdiff_t src1_linesize, \
                           const uint8_t *src2, ptrdiff_t src2_linesize, \
                           uint8_t *dst, ptrdiff_t dst_linesize, \
                           ptrdiff_t width, ptrdiff_t height, \
                           int factor1, int factor2, int half
 
 #define BLEND_FACTOR_DEPTH8   7
 #define BLEND_FACTOR_DEPTH16 15
 
 typedef void (*blend_func)(BLEND_FUNC_PARAMS);
 
 typedef struct FrameRateContext {
     const AVClass *class;
     // parameters
     AVRational dest_frame_rate;         ///< output frames per second
     int flags;                          ///< flags affecting frame rate conversion algorithm
     double scene_score;                 ///< score that denotes a scene change has happened
     int interp_start;                   ///< start of range to apply linear interpolation
     int interp_end;                     ///< end of range to apply linear interpolation
 
     int line_size[4];                   ///< bytes of pixel data per line for each plane
     int vsub;
 
     AVRational srce_time_base;          ///< timebase of source
     AVRational dest_time_base;          ///< timebase of destination
 
     av_pixelutils_sad_fn sad;           ///< Sum of the absolute difference function (scene detect only)
     double prev_mafd;                   ///< previous MAFD                           (scene detect only)
 
     int blend_factor_max;
     int bitdepth;
     AVFrame *work;
 
     AVFrame *f0;                        ///< last frame
     AVFrame *f1;                        ///< current frame
     int64_t pts0;                       ///< last frame pts in dest_time_base
     int64_t pts1;                       ///< current frame pts in dest_time_base
     int64_t delta;                      ///< pts1 to pts0 delta
     double score;                       ///< scene change score (f0 to f1)
     int flush;                          ///< 1 if the filter is being flushed
     int64_t start_pts;                  ///< pts of the first output frame
     int64_t n;                          ///< output frame counter
 
     blend_func blend;
 } FrameRateContext;
 
 void ff_framerate_init(FrameRateContext *s);
 void ff_framerate_init_x86(FrameRateContext *s);
 
 #endif /* AVFILTER_FRAMERATE_H */