vf_noise.h

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/*
 * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
 * Copyright (c) 2013 Paul B Mahol
 *
 * 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_NOISE_H
#define AVFILTER_NOISE_H
 
#include "libavutil/lfg.h"
#include "avfilter.h"
 
#define MAX_NOISE 5120
#define MAX_SHIFT 1024
#define MAX_RES (MAX_NOISE-MAX_SHIFT)
 
#define NOISE_UNIFORM  1
#define NOISE_TEMPORAL 2
#define NOISE_AVERAGED 8
#define NOISE_PATTERN  16
 
typedef struct FilterParams {
    int strength;
    unsigned flags;
    AVLFG lfg;
    int seed;
    int8_t *noise;
    const int8_t *prev_shift[MAX_RES][3];
    int rand_shift[MAX_RES];
    int rand_shift_init;
} FilterParams;
 
typedef struct NoiseContext {
    const AVClass *class;
    int nb_planes;
    int bytewidth[4];
    int height[4];
    int slice_threading_impossible;
    struct {
        int seed, strength;
        unsigned flags;
    } all;
    FilterParams param[4];
    void (*line_noise)(uint8_t *dst, const uint8_t *src, const int8_t *noise, int len, int shift);
    void (*line_noise_avg)(uint8_t *dst, const uint8_t *src, int len, const int8_t * const *shift);
} NoiseContext;
 
void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise, int len, int shift);
void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src, int len, const int8_t * const *shift);
 
void ff_noise_init_x86(NoiseContext *n);
 
#endif /* AVFILTER_NOISE_H */