FFmpeg: libavfilter/median_template.c Source File

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 "internal.h"
26 #include "video.h"
27 
28 #undef pixel
29 #if DEPTH == 8
30 #define pixel uint8_t
31 #else
32  #define pixel uint16_t
33 #endif
34 
35 #undef htype
36  #define htype uint16_t
37 
38 #undef fn
39 #undef fn2
40 #undef fn3
41  #define SHIFT ((DEPTH + 1) / 2)
42  #define BINS (1 << SHIFT)
43  #define MASK (BINS - 1)
44  #define fn3(a,b) a##_##b
45  #define fn2(a,b) fn3(a,b)
46  #define fn(a) fn2(a, DEPTH)
47 
48  #define PICK_COARSE_BIN(x, y) (BINS * (x) + ((y) >> SHIFT))
49  #define PICK_FINE_BIN(x, y, z) (BINS * ((x) * ((y) >> SHIFT) + (z)) + ((y) & MASK))
50 
51  static void fn(filter_plane)(AVFilterContext *ctx, const uint8_t *ssrc, int src_linesize,
52  uint8_t *ddst, int dst_linesize, int width, int height,
53  int slice_h_start, int slice_h_end, int jobnr)
54 {
55  MedianContext *s = ctx->priv;
56  htype *ccoarse = s->coarse[jobnr];
57  htype *cfine = s->fine[jobnr];
58  const int radius = s->radius;
59  const int radiusV = s->radiusV;
60  const int t = s->t;
61  const pixel *src = (const pixel *)ssrc;
62  pixel *dst = (pixel *)ddst;
63  const pixel *srcp;
64  const pixel *p;
65 
66  src_linesize /= sizeof(pixel);
67  dst_linesize /= sizeof(pixel);
68 
69  memset(cfine, 0, s->fine_size * sizeof(*cfine));
70  memset(ccoarse, 0, s->coarse_size * sizeof(*ccoarse));
71 
72  srcp = src + FFMAX(0, slice_h_start - radiusV) * src_linesize;
73  if (jobnr == 0) {
74  for (int i = 0; i < width; i++) {
75  cfine[PICK_FINE_BIN(width, srcp[i], i)] += radiusV + 1;
76  ccoarse[PICK_COARSE_BIN(i, srcp[i])] += radiusV + 1;
77  }
78  }
79 
80  srcp = src + FFMAX(0, slice_h_start - radiusV - (jobnr != 0)) * src_linesize;
81  for (int i = 0; i < radiusV + (jobnr != 0) * (1 + radiusV); i++) {
82  for (int j = 0; j < width; j++) {
83  cfine[PICK_FINE_BIN(width, srcp[j], j)]++;
84  ccoarse[PICK_COARSE_BIN(j, srcp[j])]++;
85  }
86  srcp += src_linesize;
87  }
88 
89  srcp = src;
90 
91  for (int i = slice_h_start; i < slice_h_end; i++) {
92  htype coarse[BINS] = { 0 };
93  htype fine[BINS][BINS] = { { 0 } };
94  htype luc[BINS] = { 0 };
95 
96  p = srcp + src_linesize * FFMAX(0, i - radiusV - 1);
97  for (int j = 0; j < width; j++) {
98  cfine[PICK_FINE_BIN(width, p[j], j)]--;
99  ccoarse[PICK_COARSE_BIN(j, p[j])]--;
100  }
101 
102  p = srcp + src_linesize * FFMIN(height - 1, i + radiusV);
103  for (int j = 0; j < width; j++) {
104  cfine[PICK_FINE_BIN(width, p[j], j)]++;
105  ccoarse[PICK_COARSE_BIN(j, p[j])]++;
106  }
107 
108  s->hmuladd(coarse, &ccoarse[0], radius, BINS);
109  for (int j = 0; j < radius; j++)
110  s->hadd(coarse, &ccoarse[BINS * j], BINS);
111  for (int k = 0; k < BINS; k++)
112  s->hmuladd(&fine[k][0], &cfine[BINS * width * k], 2 * radius + 1, BINS);
113 
114  for (int j = 0; j < width; j++) {
115  int sum = 0, k, b;
116  htype *segment;
117 
118  s->hadd(coarse, &ccoarse[BINS * FFMIN(j + radius, width - 1)], BINS);
119 
120  for (k = 0; k < BINS; k++) {
121  sum += coarse[k];
122  if (sum > t) {
123  sum -= coarse[k];
124  break;
125  }
126  }
127  av_assert0(k < BINS);
128 
129  if (luc[k] <= j - radius) {
130  memset(&fine[k], 0, BINS * sizeof(htype));
131  for (luc[k] = j - radius; luc[k] < FFMIN(j + radius + 1, width); luc[k]++)
132  s->hadd(fine[k], &cfine[BINS * (width * k + luc[k])], BINS);
133  if (luc[k] < j + radius + 1) {
134  s->hmuladd(&fine[k][0], &cfine[BINS * (width * k + width - 1)], j + radius + 1 - width, BINS);
135  luc[k] = j + radius + 1;
136  }
137  } else {
138  for (; luc[k] < j + radius + 1; luc[k]++) {
139  s->hsub(fine[k], &cfine[BINS * (width * k + FFMAX(luc[k] - 2 * radius - 1, 0))], BINS);
140  s->hadd(fine[k], &cfine[BINS * (width * k + FFMIN(luc[k], width - 1))], BINS);
141  }
142  }
143 
144  s->hsub(coarse, &ccoarse[BINS * FFMAX(j - radius, 0)], BINS);
145 
146  segment = fine[k];
147  for (b = 0; b < BINS; b++) {
148  sum += segment[b];
149  if (sum > t) {
150  dst[j] = BINS * k + b;
151  break;
152  }
153  }
154  av_assert0(b < BINS);
155  }
156 
157  dst += dst_linesize;
158  }
159 }
BINS
#define BINS
Definition: median_template.c:42
htype
#define htype
Definition: median_template.c:36
MedianContext
Definition: median.h:28
fn
#define fn(a)
Definition: median_template.c:46
b
#define b
Definition: input.c:41
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
video.h
PICK_COARSE_BIN
#define PICK_COARSE_BIN(x, y)
Definition: median_template.c:48
avassert.h
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:198
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
ctx
AVFormatContext * ctx
Definition: movenc.c:48
pixel
uint8_t pixel
Definition: tiny_ssim.c:41
PICK_FINE_BIN
#define PICK_FINE_BIN(x, y, z)
Definition: median_template.c:49
height
#define height
internal.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
filter_plane
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)
Definition: median_template.c:51
avfilter.h
segment
Definition: hls.c:76
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
pixel
#define pixel
Definition: median_template.c:32
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
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