FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_entropy.c
Date: 2024-03-29 01:21:52
Exec Total Coverage
Lines: 0 59 0.0%
Functions: 0 3 0.0%
Branches: 0 40 0.0%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2017 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 */
20
21 #include "libavutil/opt.h"
22 #include "libavutil/pixdesc.h"
23 #include "avfilter.h"
24 #include "drawutils.h"
25 #include "internal.h"
26 #include "video.h"
27
28 typedef struct EntropyContext {
29 const AVClass *class;
30
31 int mode;
32
33 int nb_planes;
34 int planeheight[4];
35 int planewidth[4];
36 int depth;
37 int is_rgb;
38 uint8_t rgba_map[4];
39 char planenames[4];
40 int64_t *histogram;
41 } EntropyContext;
42
43 #define OFFSET(x) offsetof(EntropyContext, x)
44 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
45 static const AVOption entropy_options[] = {
46 { "mode", "set kind of histogram entropy measurement", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, .unit = "mode" },
47 { "normal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "mode" },
48 { "diff", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "mode" },
49 { NULL }
50 };
51
52 AVFILTER_DEFINE_CLASS(entropy);
53
54 static const enum AVPixelFormat pixfmts[] = {
55 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
56 AV_PIX_FMT_YUV440P,
57 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
58 AV_PIX_FMT_YUVJ440P,
59 AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
60 AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
61 AV_PIX_FMT_YUV440P10,
62 AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
63 AV_PIX_FMT_YUV440P12,
64 AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
65 AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
66 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
67 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
68 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
69 AV_PIX_FMT_NONE
70 };
71
72 static int config_input(AVFilterLink *inlink)
73 {
74 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
75 AVFilterContext *ctx = inlink->dst;
76 EntropyContext *s = ctx->priv;
77
78 s->nb_planes = desc->nb_components;
79
80 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
81 s->planeheight[0] = s->planeheight[3] = inlink->h;
82 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
83 s->planewidth[0] = s->planewidth[3] = inlink->w;
84
85 s->depth = desc->comp[0].depth;
86 s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
87
88 s->planenames[0] = s->is_rgb ? 'R' : 'Y';
89 s->planenames[1] = s->is_rgb ? 'G' : 'U';
90 s->planenames[2] = s->is_rgb ? 'B' : 'V';
91 s->planenames[3] = 'A';
92
93 s->histogram = av_malloc_array(1 << s->depth, sizeof(*s->histogram));
94 if (!s->histogram)
95 return AVERROR(ENOMEM);
96
97 return 0;
98 }
99
100 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
101 {
102 AVFilterContext *ctx = inlink->dst;
103 AVFilterLink *outlink = ctx->outputs[0];
104 EntropyContext *s = ctx->priv;
105 int plane, y, x;
106
107 for (plane = 0; plane < s->nb_planes; plane++) {
108 int cidx = s->is_rgb ? s->rgba_map[plane] : plane;
109 const uint8_t *src8 = in->data[plane];
110 const uint16_t *src16 = (const uint16_t *)in->data[plane];
111 float total = s->planewidth[plane] * s->planeheight[plane];
112 float entropy = 0;
113 char metabuf[128];
114 char key[128];
115
116 memset(s->histogram, 0, (1 << s->depth) * sizeof(*s->histogram));
117
118 if (s->depth <= 8) {
119 for (y = 0; y < s->planeheight[plane]; y++) {
120 for (x = 0; x < s->planewidth[plane]; x++) {
121 s->histogram[src8[x]]++;
122 }
123
124 src8 += in->linesize[plane];
125 }
126 } else {
127 for (y = 0; y < s->planeheight[plane]; y++) {
128 for (x = 0; x < s->planewidth[plane]; x++) {
129 s->histogram[src16[x]]++;
130 }
131
132 src16 += in->linesize[plane] / 2;
133 }
134 }
135
136 for (y = 0; y < 1 << s->depth; y++) {
137 if (s->mode == 0) {
138 if (s->histogram[y]) {
139 float p = s->histogram[y] / total;
140 entropy += -log2(p) * p;
141 }
142 } else if (s->mode == 1) {
143 if (y && (s->histogram[y] - s->histogram[y - 1]) != 0) {
144 float p = FFABS(s->histogram[y] - s->histogram[y - 1]) / total;
145 entropy += -log2(p) * p;
146 }
147 }
148 }
149
150 snprintf(key, sizeof(key), "lavfi.entropy.entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]);
151 snprintf(metabuf, sizeof(metabuf), "%f", entropy);
152 av_dict_set(&in->metadata, key, metabuf, 0);
153 snprintf(key, sizeof(key), "lavfi.entropy.normalized_entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]);
154 snprintf(metabuf, sizeof(metabuf), "%f", entropy / log2(1 << s->depth));
155 av_dict_set(&in->metadata, key, metabuf, 0);
156 }
157
158 return ff_filter_frame(outlink, in);
159 }
160
161 static av_cold void uninit(AVFilterContext *ctx)
162 {
163 EntropyContext *s = ctx->priv;
164
165 av_freep(&s->histogram);
166 }
167
168 static const AVFilterPad inputs[] = {
169 {
170 .name = "default",
171 .type = AVMEDIA_TYPE_VIDEO,
172 .filter_frame = filter_frame,
173 .config_props = config_input,
174 },
175 };
176
177 const AVFilter ff_vf_entropy = {
178 .name = "entropy",
179 .description = NULL_IF_CONFIG_SMALL("Measure video frames entropy."),
180 .priv_size = sizeof(EntropyContext),
181 .uninit = uninit,
182 FILTER_INPUTS(inputs),
183 FILTER_OUTPUTS(ff_video_default_filterpad),
184 FILTER_PIXFMTS_ARRAY(pixfmts),
185 .priv_class = &entropy_class,
186 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY,
187 };
188