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/*
* Copyright (c) 2019 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
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*/
#include "libavutil/avassert.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#undef pixel
#if DEPTH == 8
#define pixel uint8_t
#else
#define pixel uint16_t
#endif
#undef htype
#define htype uint16_t
#undef fn
#undef fn2
#undef fn3
#define SHIFT ((DEPTH + 1) / 2)
#define BINS (1 << SHIFT)
#define MASK (BINS - 1)
#define fn3(a,b) a##_##b
#define fn2(a,b) fn3(a,b)
#define fn(a) fn2(a, DEPTH)
#define PICK_COARSE_BIN(x, y) (BINS * (x) + ((y) >> SHIFT))
#define PICK_FINE_BIN(x, y, z) (BINS * ((x) * ((y) >> SHIFT) + (z)) + ((y) & MASK))
static void fn(filter_plane)(AVFilterContext *ctx, const uint8_t *ssrc, int src_linesize,
uint8_t *ddst, int dst_linesize, int width, int height,
int slice_h_start, int slice_h_end, int jobnr)
{
MedianContext *s = ctx->priv;
htype *ccoarse = s->coarse[jobnr];
htype *cfine = s->fine[jobnr];
const int radius = s->radius;
const int t = s->t;
const pixel *src = (const pixel *)ssrc;
pixel *dst = (pixel *)ddst;
const pixel *srcp;
const pixel *p;
src_linesize /= sizeof(pixel);
dst_linesize /= sizeof(pixel);
memset(cfine, 0, s->fine_size * sizeof(*cfine));
memset(ccoarse, 0, s->coarse_size * sizeof(*ccoarse));
srcp = src + FFMAX(0, slice_h_start - radius) * src_linesize;
if (jobnr == 0) {
for (int i = 0; i < width; i++) {
cfine[PICK_FINE_BIN(width, srcp[i], i)] += radius + 1;
ccoarse[PICK_COARSE_BIN(i, srcp[i])] += radius + 1;
}
}
srcp = src + FFMAX(0, slice_h_start - radius - (jobnr != 0)) * src_linesize;
for (int i = 0; i < radius + (jobnr != 0) * (1 + radius); i++) {
for (int j = 0; j < width; j++) {
cfine[PICK_FINE_BIN(width, srcp[j], j)]++;
ccoarse[PICK_COARSE_BIN(j, srcp[j])]++;
}
srcp += src_linesize;
}
srcp = src;
for (int i = slice_h_start; i < slice_h_end; i++) {
htype coarse[BINS] = { 0 };
htype fine[BINS][BINS] = { { 0 } };
htype luc[BINS] = { 0 };
p = srcp + src_linesize * FFMAX(0, i - radius - 1);
for (int j = 0; j < width; j++) {
cfine[PICK_FINE_BIN(width, p[j], j)]--;
ccoarse[PICK_COARSE_BIN(j, p[j])]--;
}
p = srcp + src_linesize * FFMIN(height - 1, i + radius);
for (int j = 0; j < width; j++) {
cfine[PICK_FINE_BIN(width, p[j], j)]++;
ccoarse[PICK_COARSE_BIN(j, p[j])]++;
}
s->hmuladd(coarse, &ccoarse[0], radius, BINS);
for (int j = 0; j < radius; j++)
s->hadd(coarse, &ccoarse[BINS * j], BINS);
for (int k = 0; k < BINS; k++)
s->hmuladd(&fine[k][0], &cfine[BINS * width * k], 2 * radius + 1, BINS);
for (int j = 0; j < width; j++) {
int sum = 0, k, b;
htype *segment;
s->hadd(coarse, &ccoarse[BINS * FFMIN(j + radius, width - 1)], BINS);
for (k = 0; k < BINS; k++) {
sum += coarse[k];
if (sum > t) {
sum -= coarse[k];
break;
}
}
av_assert0(k < BINS);
if (luc[k] <= j - radius) {
memset(&fine[k], 0, BINS * sizeof(htype));
for (luc[k] = j - radius; luc[k] < FFMIN(j + radius + 1, width); luc[k]++)
s->hadd(fine[k], &cfine[BINS * (width * k + luc[k])], BINS);
if (luc[k] < j + radius + 1) {
s->hmuladd(&fine[k][0], &cfine[BINS * (width * k + width - 1)], j + radius + 1 - width, BINS);
luc[k] = j + radius + 1;
}
} else {
for (; luc[k] < j + radius + 1; luc[k]++) {
s->hsub(fine[k], &cfine[BINS * (width * k + FFMAX(luc[k] - 2 * radius - 1, 0))], BINS);
s->hadd(fine[k], &cfine[BINS * (width * k + FFMIN(luc[k], width - 1))], BINS);
}
}
s->hsub(coarse, &ccoarse[BINS * FFMAX(j - radius, 0)], BINS);
segment = fine[k];
for (b = 0; b < BINS; b++) {
sum += segment[b];
if (sum > t) {
dst[j] = BINS * k + b;
break;
}
}
av_assert0(b < BINS);
}
dst += dst_linesize;
}
}
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