FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_lumakey.c
Date: 2024-04-12 08:31:17
Exec Total Coverage
Lines: 0 71 0.0%
Functions: 0 5 0.0%
Branches: 0 36 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 "internal.h"
25 #include "video.h"
26
27 typedef struct LumakeyContext {
28 const AVClass *class;
29
30 double threshold;
31 double tolerance;
32 double softness;
33
34 int white;
35 int black;
36 int so;
37 int max;
38
39 int (*do_lumakey_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
40 } LumakeyContext;
41
42 static int do_lumakey_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
43 {
44 LumakeyContext *s = ctx->priv;
45 AVFrame *frame = arg;
46 const int slice_start = (frame->height * jobnr) / nb_jobs;
47 const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
48 uint8_t *alpha = frame->data[3] + slice_start * frame->linesize[3];
49 const uint8_t *luma = frame->data[0] + slice_start * frame->linesize[0];
50 const int so = s->so;
51 const int w = s->white;
52 const int b = s->black;
53 int x, y;
54
55 for (y = slice_start; y < slice_end; y++) {
56 for (x = 0; x < frame->width; x++) {
57 if (luma[x] >= b && luma[x] <= w) {
58 alpha[x] = 0;
59 } else if (luma[x] > b - so && luma[x] < w + so) {
60 if (luma[x] < b) {
61 alpha[x] = 255 - (luma[x] - b + so) * 255 / so;
62 } else {
63 alpha[x] = (luma[x] - w) * 255 / so;
64 }
65 }
66 }
67 luma += frame->linesize[0];
68 alpha += frame->linesize[3];
69 }
70
71 return 0;
72 }
73
74 static int do_lumakey_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
75 {
76 LumakeyContext *s = ctx->priv;
77 AVFrame *frame = arg;
78 const int slice_start = (frame->height * jobnr) / nb_jobs;
79 const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
80 uint16_t *alpha = (uint16_t *)(frame->data[3] + slice_start * frame->linesize[3]);
81 const uint16_t *luma = (const uint16_t *)(frame->data[0] + slice_start * frame->linesize[0]);
82 const int so = s->so;
83 const int w = s->white;
84 const int b = s->black;
85 const int m = s->max;
86 int x, y;
87
88 for (y = slice_start; y < slice_end; y++) {
89 for (x = 0; x < frame->width; x++) {
90 if (luma[x] >= b && luma[x] <= w) {
91 alpha[x] = 0;
92 } else if (luma[x] > b - so && luma[x] < w + so) {
93 if (luma[x] < b) {
94 alpha[x] = m - (luma[x] - b + so) * m / so;
95 } else {
96 alpha[x] = (luma[x] - w) * m / so;
97 }
98 }
99 }
100 luma += frame->linesize[0] / 2;
101 alpha += frame->linesize[3] / 2;
102 }
103
104 return 0;
105 }
106
107 static int config_input(AVFilterLink *inlink)
108 {
109 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
110 AVFilterContext *ctx = inlink->dst;
111 LumakeyContext *s = ctx->priv;
112 int depth;
113
114 depth = desc->comp[0].depth;
115 if (depth == 8) {
116 s->white = av_clip_uint8((s->threshold + s->tolerance) * 255);
117 s->black = av_clip_uint8((s->threshold - s->tolerance) * 255);
118 s->do_lumakey_slice = do_lumakey_slice8;
119 s->so = s->softness * 255;
120 } else {
121 s->max = (1 << depth) - 1;
122 s->white = av_clip((s->threshold + s->tolerance) * s->max, 0, s->max);
123 s->black = av_clip((s->threshold - s->tolerance) * s->max, 0, s->max);
124 s->do_lumakey_slice = do_lumakey_slice16;
125 s->so = s->softness * s->max;
126 }
127
128 return 0;
129 }
130
131 static int filter_frame(AVFilterLink *link, AVFrame *frame)
132 {
133 AVFilterContext *ctx = link->dst;
134 LumakeyContext *s = ctx->priv;
135 int ret;
136
137 if (ret = ff_filter_execute(ctx, s->do_lumakey_slice, frame, NULL,
138 FFMIN(frame->height, ff_filter_get_nb_threads(ctx))))
139 return ret;
140
141 return ff_filter_frame(ctx->outputs[0], frame);
142 }
143
144 static const enum AVPixelFormat pixel_fmts[] = {
145 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
146 AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9,
147 AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10,
148 AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA422P12,
149 AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16,
150 AV_PIX_FMT_NONE
151 };
152
153 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
154 char *res, int res_len, int flags)
155 {
156 int ret;
157
158 ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
159 if (ret < 0)
160 return ret;
161
162 return config_input(ctx->inputs[0]);
163 }
164
165 static const AVFilterPad lumakey_inputs[] = {
166 {
167 .name = "default",
168 .type = AVMEDIA_TYPE_VIDEO,
169 .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
170 .filter_frame = filter_frame,
171 .config_props = config_input,
172 },
173 };
174
175 #define OFFSET(x) offsetof(LumakeyContext, x)
176 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
177
178 static const AVOption lumakey_options[] = {
179 { "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
180 { "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, 0, 1, FLAGS },
181 { "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
182 { NULL }
183 };
184
185 AVFILTER_DEFINE_CLASS(lumakey);
186
187 const AVFilter ff_vf_lumakey = {
188 .name = "lumakey",
189 .description = NULL_IF_CONFIG_SMALL("Turns a certain luma into transparency."),
190 .priv_size = sizeof(LumakeyContext),
191 .priv_class = &lumakey_class,
192 FILTER_INPUTS(lumakey_inputs),
193 FILTER_OUTPUTS(ff_video_default_filterpad),
194 FILTER_PIXFMTS_ARRAY(pixel_fmts),
195 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
196 .process_command = process_command,
197 };
198