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  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 */
  65.