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/imgutils.h"
23 #include "avfilter.h"
24 #include "formats.h"
25 #include "internal.h"
26 #include "video.h"
27
28 typedef struct DespillContext {
29 const AVClass *class;
30
31 int co[4]; /* color offsets rgba */
32
33 int alpha;
34 int type;
35 float spillmix;
36 float spillexpand;
37 float redscale;
38 float greenscale;
39 float bluescale;
40 float brightness;
41 } DespillContext;
42
do_despill_slice(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)43 static int do_despill_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
44 {
45 DespillContext *s = ctx->priv;
46 AVFrame *frame = arg;
47 const int ro = s->co[0], go = s->co[1], bo = s->co[2], ao = s->co[3];
48 const int slice_start = (frame->height * jobnr) / nb_jobs;
49 const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
50 const float brightness = s->brightness;
51 const float redscale = s->redscale;
52 const float greenscale = s->greenscale;
53 const float bluescale = s->bluescale;
54 const float spillmix = s->spillmix;
55 const float factor = (1.f - spillmix) * (1.f - s->spillexpand);
56 float red, green, blue;
57 int x, y;
58
59 for (y = slice_start; y < slice_end; y++) {
60 uint8_t *dst = frame->data[0] + y * frame->linesize[0];
61
62 for (x = 0; x < frame->width; x++) {
63 float spillmap;
64
65 red = dst[x * 4 + ro] / 255.f;
66 green = dst[x * 4 + go] / 255.f;
67 blue = dst[x * 4 + bo] / 255.f;
68
69 if (s->type) {
70 spillmap = FFMAX(blue - (red * spillmix + green * factor), 0.f);
71 } else {
72 spillmap = FFMAX(green - (red * spillmix + blue * factor), 0.f);
73 }
74
75 red = FFMAX(red + spillmap * redscale + brightness * spillmap, 0.f);
76 green = FFMAX(green + spillmap * greenscale + brightness * spillmap, 0.f);
77 blue = FFMAX(blue + spillmap * bluescale + brightness * spillmap, 0.f);
78
79 dst[x * 4 + ro] = av_clip_uint8(red * 255);
80 dst[x * 4 + go] = av_clip_uint8(green * 255);
81 dst[x * 4 + bo] = av_clip_uint8(blue * 255);
82 if (s->alpha) {
83 spillmap = 1.f - spillmap;
84 dst[x * 4 + ao] = av_clip_uint8(spillmap * 255);
85 }
86 }
87 }
88
89 return 0;
90 }
91
filter_frame(AVFilterLink * link,AVFrame * frame)92 static int filter_frame(AVFilterLink *link, AVFrame *frame)
93 {
94 AVFilterContext *ctx = link->dst;
95 int ret;
96
97 if (ret = ff_filter_execute(ctx, do_despill_slice, frame, NULL,
98 FFMIN(frame->height, ff_filter_get_nb_threads(ctx))))
99 return ret;
100
101 return ff_filter_frame(ctx->outputs[0], frame);
102 }
103
config_output(AVFilterLink * outlink)104 static av_cold int config_output(AVFilterLink *outlink)
105 {
106 AVFilterContext *ctx = outlink->src;
107 DespillContext *s = ctx->priv;
108 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
109 int i;
110
111 for (i = 0; i < 4; ++i)
112 s->co[i] = desc->comp[i].offset;
113
114 return 0;
115 }
116
117 static const enum AVPixelFormat pixel_fmts[] = {
118 AV_PIX_FMT_ARGB,
119 AV_PIX_FMT_RGBA,
120 AV_PIX_FMT_ABGR,
121 AV_PIX_FMT_BGRA,
122 AV_PIX_FMT_NONE
123 };
124
125 static const AVFilterPad despill_inputs[] = {
126 {
127 .name = "default",
128 .type = AVMEDIA_TYPE_VIDEO,
129 .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
130 .filter_frame = filter_frame,
131 },
132 };
133
134 static const AVFilterPad despill_outputs[] = {
135 {
136 .name = "default",
137 .type = AVMEDIA_TYPE_VIDEO,
138 .config_props = config_output,
139 },
140 };
141
142 #define OFFSET(x) offsetof(DespillContext, x)
143 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
144
145 static const AVOption despill_options[] = {
146 { "type", "set the screen type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "type" },
147 { "green", "greenscreen", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "type" },
148 { "blue", "bluescreen", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "type" },
149 { "mix", "set the spillmap mix", OFFSET(spillmix), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
150 { "expand", "set the spillmap expand", OFFSET(spillexpand), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, FLAGS },
151 { "red", "set red scale", OFFSET(redscale), AV_OPT_TYPE_FLOAT, {.dbl=0}, -100, 100, FLAGS },
152 { "green", "set green scale", OFFSET(greenscale), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -100, 100, FLAGS },
153 { "blue", "set blue scale", OFFSET(bluescale), AV_OPT_TYPE_FLOAT, {.dbl=0}, -100, 100, FLAGS },
154 { "brightness", "set brightness", OFFSET(brightness), AV_OPT_TYPE_FLOAT, {.dbl=0}, -10, 10, FLAGS },
155 { "alpha", "change alpha component", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
156 { NULL }
157 };
158
159 AVFILTER_DEFINE_CLASS(despill);
160
161 const AVFilter ff_vf_despill = {
162 .name = "despill",
163 .description = NULL_IF_CONFIG_SMALL("Despill video."),
164 .priv_size = sizeof(DespillContext),
165 .priv_class = &despill_class,
166 FILTER_INPUTS(despill_inputs),
167 FILTER_OUTPUTS(despill_outputs),
168 FILTER_PIXFMTS_ARRAY(pixel_fmts),
169 .process_command = ff_filter_process_command,
170 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
171 };
172