ffmpeg/libavfilter/vf_noise.h

   1 /*
   2  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
   3  * Copyright (c) 2013 Paul B Mahol
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef AVFILTER_NOISE_H
  23 #define AVFILTER_NOISE_H
  24
  25 #include "libavutil/lfg.h"
  26 #include "avfilter.h"
  27
  28 #define MAX_NOISE 5120
  29 #define MAX_SHIFT 1024
  30 #define MAX_RES (MAX_NOISE-MAX_SHIFT)
  31
  32 #define NOISE_UNIFORM  1
  33 #define NOISE_TEMPORAL 2
  34 #define NOISE_AVERAGED 8
  35 #define NOISE_PATTERN  16
  36
  37 typedef struct {
  38     int strength;
  39     unsigned flags;
  40     AVLFG lfg;
  41     int seed;
  42     int8_t *noise;
  43     int8_t *prev_shift[MAX_RES][3];
  44     int rand_shift[MAX_RES];
  45     int rand_shift_init;
  46 } FilterParams;
  47
  48 typedef struct {
  49     const AVClass *class;
  50     int nb_planes;
  51     int bytewidth[4];
  52     int height[4];
  53     FilterParams all;
  54     FilterParams param[4];
  55     void (*line_noise)(uint8_t *dst, const uint8_t *src, const int8_t *noise, int len, int shift);
  56     void (*line_noise_avg)(uint8_t *dst, const uint8_t *src, int len, const int8_t * const *shift);
  57 } NoiseContext;
  58
  59 void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise, int len, int shift);
  60 void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src, int len, const int8_t * const *shift);
  61
  62 void ff_noise_init_x86(NoiseContext *n);
  63
  64 #endif /* AVFILTER_NOISE_H */