FFmpeg/libavfilter/framerate.h

/*
 * 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 "scene_sad.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_DEPTH(n) (n-1)

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 height[4];                      ///< height of each plane
    int vsub;

    AVRational srce_time_base;          ///< timebase of source
    AVRational dest_time_base;          ///< timebase of destination

    ff_scene_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 */