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/*
* Copyright (c) 2016 Clément Bœsch <u pkh me>
*
* 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_NLMEANS_INIT_H
#define AVFILTER_NLMEANS_INIT_H
#include <stddef.h>
#include <stdint.h>
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/macros.h"
#include "vf_nlmeans.h"
/**
* Compute squared difference of the safe area (the zone where s1 and s2
* overlap). It is likely the largest integral zone, so it is interesting to do
* as little checks as possible; contrary to the unsafe version of this
* function, we do not need any clipping here.
*
* The line above dst and the column to its left are always readable.
*/
static void compute_safe_ssd_integral_image_c(uint32_t *dst, ptrdiff_t dst_linesize_32,
const uint8_t *s1, ptrdiff_t linesize1,
const uint8_t *s2, ptrdiff_t linesize2,
int w, int h)
{
const uint32_t *dst_top = dst - dst_linesize_32;
/* SIMD-friendly assumptions allowed here */
av_assert2(!(w & 0xf) && w >= 16 && h >= 1);
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x += 4) {
const int d0 = s1[x ] - s2[x ];
const int d1 = s1[x + 1] - s2[x + 1];
const int d2 = s1[x + 2] - s2[x + 2];
const int d3 = s1[x + 3] - s2[x + 3];
dst[x ] = dst_top[x ] - dst_top[x - 1] + d0*d0;
dst[x + 1] = dst_top[x + 1] - dst_top[x ] + d1*d1;
dst[x + 2] = dst_top[x + 2] - dst_top[x + 1] + d2*d2;
dst[x + 3] = dst_top[x + 3] - dst_top[x + 2] + d3*d3;
dst[x ] += dst[x - 1];
dst[x + 1] += dst[x ];
dst[x + 2] += dst[x + 1];
dst[x + 3] += dst[x + 2];
}
s1 += linesize1;
s2 += linesize2;
dst += dst_linesize_32;
dst_top += dst_linesize_32;
}
}
static void compute_weights_line_c(const uint32_t *const iia,
const uint32_t *const iib,
const uint32_t *const iid,
const uint32_t *const iie,
const uint8_t *const src,
float *total_weight,
float *sum,
const float *const weight_lut,
int max_meaningful_diff,
int startx, int endx)
{
for (int x = startx; x < endx; x++) {
/*
* M is a discrete map where every entry contains the sum of all the entries
* in the rectangle from the top-left origin of M to its coordinate. In the
* following schema, "i" contains the sum of the whole map:
*
* M = +----------+-----------------+----+
* | | | |
* | | | |
* | a| b| c|
* +----------+-----------------+----+
* | | | |
* | | | |
* | | X | |
* | | | |
* | d| e| f|
* +----------+-----------------+----+
* | | | |
* | g| h| i|
* +----------+-----------------+----+
*
* The sum of the X box can be calculated with:
* X = e-d-b+a
*
* See https://en.wikipedia.org/wiki/Summed_area_table
*
* The compute*_ssd functions compute the integral image M where every entry
* contains the sum of the squared difference of every corresponding pixels of
* two input planes of the same size as M.
*/
const uint32_t a = iia[x];
const uint32_t b = iib[x];
const uint32_t d = iid[x];
const uint32_t e = iie[x];
const uint32_t patch_diff_sq = FFMIN(e - d - b + a, max_meaningful_diff);
const float weight = weight_lut[patch_diff_sq]; // exp(-patch_diff_sq * s->pdiff_scale)
total_weight[x] += weight;
sum[x] += weight * src[x];
}
}
static av_unused void ff_nlmeans_init(NLMeansDSPContext *dsp)
{
dsp->compute_safe_ssd_integral_image = compute_safe_ssd_integral_image_c;
dsp->compute_weights_line = compute_weights_line_c;
if (ARCH_AARCH64)
ff_nlmeans_init_aarch64(dsp);
if (ARCH_X86)
ff_nlmeans_init_x86(dsp);
}
#endif /* AVFILTER_NLMEANS_INIT_H */
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