FFmpeg
median_template.c
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1 /*
2  * Copyright (c) 2019 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  * Redistribution and use in source and binary forms, with or without modification,
20  * are permitted provided that the following conditions are met:
21  */
22 
23 #include "libavutil/avassert.h"
24 #include "avfilter.h"
25 #include "formats.h"
26 #include "internal.h"
27 #include "video.h"
28 
29 #undef pixel
30 #if DEPTH == 8
31 #define pixel uint8_t
32 #else
33 #define pixel uint16_t
34 #endif
35 
36 #undef htype
37 #define htype uint16_t
38 
39 #undef fn
40 #undef fn2
41 #undef fn3
42 #define SHIFT ((DEPTH + 1) / 2)
43 #define BINS (1 << SHIFT)
44 #define MASK (BINS - 1)
45 #define fn3(a,b) a##_##b
46 #define fn2(a,b) fn3(a,b)
47 #define fn(a) fn2(a, DEPTH)
48 
49 #define PICK_COARSE_BIN(x, y) (BINS * (x) + ((y) >> SHIFT))
50 #define PICK_FINE_BIN(x, y, z) (BINS * ((x) * ((y) >> SHIFT) + (z)) + ((y) & MASK))
51 
52 static void fn(filter_plane)(AVFilterContext *ctx, const uint8_t *ssrc, int src_linesize,
53  uint8_t *ddst, int dst_linesize, int width, int height,
54  int slice_h_start, int slice_h_end, int jobnr)
55 {
56  MedianContext *s = ctx->priv;
57  htype *ccoarse = s->coarse[jobnr];
58  htype *cfine = s->fine[jobnr];
59  const int radius = s->radius;
60  const int radiusV = s->radiusV;
61  const int t = s->t;
62  const pixel *src = (const pixel *)ssrc;
63  pixel *dst = (pixel *)ddst;
64  const pixel *srcp;
65  const pixel *p;
66 
67  src_linesize /= sizeof(pixel);
68  dst_linesize /= sizeof(pixel);
69 
70  memset(cfine, 0, s->fine_size * sizeof(*cfine));
71  memset(ccoarse, 0, s->coarse_size * sizeof(*ccoarse));
72 
73  srcp = src + FFMAX(0, slice_h_start - radiusV) * src_linesize;
74  if (jobnr == 0) {
75  for (int i = 0; i < width; i++) {
76  cfine[PICK_FINE_BIN(width, srcp[i], i)] += radiusV + 1;
77  ccoarse[PICK_COARSE_BIN(i, srcp[i])] += radiusV + 1;
78  }
79  }
80 
81  srcp = src + FFMAX(0, slice_h_start - radiusV - (jobnr != 0)) * src_linesize;
82  for (int i = 0; i < radiusV + (jobnr != 0) * (1 + radiusV); i++) {
83  for (int j = 0; j < width; j++) {
84  cfine[PICK_FINE_BIN(width, srcp[j], j)]++;
85  ccoarse[PICK_COARSE_BIN(j, srcp[j])]++;
86  }
87  srcp += src_linesize;
88  }
89 
90  srcp = src;
91 
92  for (int i = slice_h_start; i < slice_h_end; i++) {
93  htype coarse[BINS] = { 0 };
94  htype fine[BINS][BINS] = { { 0 } };
95  htype luc[BINS] = { 0 };
96 
97  p = srcp + src_linesize * FFMAX(0, i - radiusV - 1);
98  for (int j = 0; j < width; j++) {
99  cfine[PICK_FINE_BIN(width, p[j], j)]--;
100  ccoarse[PICK_COARSE_BIN(j, p[j])]--;
101  }
102 
103  p = srcp + src_linesize * FFMIN(height - 1, i + radiusV);
104  for (int j = 0; j < width; j++) {
105  cfine[PICK_FINE_BIN(width, p[j], j)]++;
106  ccoarse[PICK_COARSE_BIN(j, p[j])]++;
107  }
108 
109  s->hmuladd(coarse, &ccoarse[0], radius, BINS);
110  for (int j = 0; j < radius; j++)
111  s->hadd(coarse, &ccoarse[BINS * j], BINS);
112  for (int k = 0; k < BINS; k++)
113  s->hmuladd(&fine[k][0], &cfine[BINS * width * k], 2 * radius + 1, BINS);
114 
115  for (int j = 0; j < width; j++) {
116  int sum = 0, k, b;
117  htype *segment;
118 
119  s->hadd(coarse, &ccoarse[BINS * FFMIN(j + radius, width - 1)], BINS);
120 
121  for (k = 0; k < BINS; k++) {
122  sum += coarse[k];
123  if (sum > t) {
124  sum -= coarse[k];
125  break;
126  }
127  }
128  av_assert0(k < BINS);
129 
130  if (luc[k] <= j - radius) {
131  memset(&fine[k], 0, BINS * sizeof(htype));
132  for (luc[k] = j - radius; luc[k] < FFMIN(j + radius + 1, width); luc[k]++)
133  s->hadd(fine[k], &cfine[BINS * (width * k + luc[k])], BINS);
134  if (luc[k] < j + radius + 1) {
135  s->hmuladd(&fine[k][0], &cfine[BINS * (width * k + width - 1)], j + radius + 1 - width, BINS);
136  luc[k] = j + radius + 1;
137  }
138  } else {
139  for (; luc[k] < j + radius + 1; luc[k]++) {
140  s->hsub(fine[k], &cfine[BINS * (width * k + FFMAX(luc[k] - 2 * radius - 1, 0))], BINS);
141  s->hadd(fine[k], &cfine[BINS * (width * k + FFMIN(luc[k], width - 1))], BINS);
142  }
143  }
144 
145  s->hsub(coarse, &ccoarse[BINS * FFMAX(j - radius, 0)], BINS);
146 
147  segment = fine[k];
148  for (b = 0; b < BINS; b++) {
149  sum += segment[b];
150  if (sum > t) {
151  dst[j] = BINS * k + b;
152  break;
153  }
154  }
155  av_assert0(b < BINS);
156  }
157 
158  dst += dst_linesize;
159  }
160 }
Main libavfilter public API header.
#define src
Definition: vp8dsp.c:254
BYTE int const BYTE * srcp
Definition: avisynth_c.h:908
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
uint16_t ** coarse
Definition: median.h:41
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)
#define height
#define pixel
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
uint16_t ** fine
Definition: median.h:41
int radius
Definition: median.h:32
simple assert() macros that are a bit more flexible than ISO C assert().
int fine_size
Definition: median.h:42
void(* hmuladd)(uint16_t *dst, const uint16_t *src, int f, int bins)
Definition: median.h:48
#define FFMAX(a, b)
Definition: common.h:94
Definition: hls.c:68
#define b
Definition: input.c:41
#define FFMIN(a, b)
Definition: common.h:96
#define width
void(* hadd)(uint16_t *dst, const uint16_t *src, int bins)
Definition: median.h:46
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
#define BINS
int radiusV
Definition: median.h:33
#define htype
int coarse_size
Definition: median.h:42
uint8_t pixel
Definition: tiny_ssim.c:42
#define PICK_FINE_BIN(x, y, z)
#define PICK_COARSE_BIN(x, y)
An instance of a filter.
Definition: avfilter.h:338
internal API functions
void(* hsub)(uint16_t *dst, const uint16_t *src, int bins)
Definition: median.h:47
#define fn(a)