FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_alphamerge.c
Date: 2025-10-19 01:36:17
Exec Total Coverage
Lines: 66 76 86.8%
Functions: 8 9 88.9%
Branches: 18 30 60.0%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2012 Steven Robertson
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 /**
22 * @file
23 * copy an alpha component from another video's luma
24 */
25
26 #include <string.h>
27
28 #include "libavutil/imgutils.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/pixfmt.h"
31 #include "avfilter.h"
32 #include "drawutils.h"
33 #include "formats.h"
34 #include "filters.h"
35 #include "framesync.h"
36 #include "video.h"
37
38 enum { Y, U, V, A };
39
40 typedef struct AlphaMergeContext {
41 const AVClass *class;
42
43 int is_packed_rgb;
44 uint8_t rgba_map[4];
45
46 FFFrameSync fs;
47 } AlphaMergeContext;
48
49 200 static int do_alphamerge(FFFrameSync *fs)
50 {
51 200 AVFilterContext *ctx = fs->parent;
52 200 AVFilterLink *outlink = ctx->outputs[0];
53 200 AlphaMergeContext *s = ctx->priv;
54 AVFrame *main_buf, *alpha_buf;
55 int ret;
56
57 200 ret = ff_framesync_dualinput_get_writable(fs, &main_buf, &alpha_buf);
58
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 200 if (ret < 0)
59 ✗ return ret;
60 200 main_buf->alpha_mode = outlink->alpha_mode;
61
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 200 if (!alpha_buf)
62 ✗ return ff_filter_frame(ctx->outputs[0], main_buf);
63
64
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 200 if (alpha_buf->color_range == AVCOL_RANGE_MPEG) {
65 ✗ av_log(ctx, AV_LOG_WARNING, "alpha plane color range tagged as %s, "
66 "output will be wrong!\n",
67 ✗ av_color_range_name(alpha_buf->color_range));
68 }
69
70
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 200 if (s->is_packed_rgb) {
71 int x, y;
72 uint8_t *pin, *pout;
73
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 28900 for (y = 0; y < main_buf->height; y++) {
74 28800 pin = alpha_buf->data[0] + y * alpha_buf->linesize[0];
75 28800 pout = main_buf->data[0] + y * main_buf->linesize[0] + s->rgba_map[A];
76
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 10166400 for (x = 0; x < main_buf->width; x++) {
77 10137600 *pout = *pin;
78 10137600 pin += 1;
79 10137600 pout += 4;
80 }
81 }
82 } else {
83 100 const int main_linesize = main_buf->linesize[A];
84 100 const int alpha_linesize = alpha_buf->linesize[Y];
85 100 av_image_copy_plane(main_buf->data[A], main_linesize,
86 100 alpha_buf->data[Y], alpha_linesize,
87 100 FFMIN(main_linesize, alpha_linesize), alpha_buf->height);
88 }
89
90 200 return ff_filter_frame(ctx->outputs[0], main_buf);
91 }
92
93 8 static av_cold int init(AVFilterContext *ctx)
94 {
95 8 AlphaMergeContext *s = ctx->priv;
96
97 8 s->fs.on_event = do_alphamerge;
98 8 return 0;
99 }
100
101 4 static int query_formats(const AVFilterContext *ctx,
102 AVFilterFormatsConfig **cfg_in,
103 AVFilterFormatsConfig **cfg_out)
104 {
105 static const enum AVPixelFormat main_fmts[] = {
106 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
107 AV_PIX_FMT_GBRAP,
108 AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
109 AV_PIX_FMT_NONE
110 };
111 static const enum AVPixelFormat alpha_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
112 int ret;
113
114 4 ret = ff_formats_ref(ff_make_format_list(alpha_fmts),
115 4 &cfg_in[1]->formats);
116
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 4 if (ret < 0)
117 ✗ return ret;
118
119 4 ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, main_fmts);
120
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 4 if (ret < 0)
121 ✗ return ret;
122
123 4 ret = ff_formats_ref(ff_make_formats_list_singleton(AVALPHA_MODE_STRAIGHT),
124 4 &cfg_out[0]->alpha_modes);
125
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 4 if (ret < 0)
126 ✗ return ret;
127
128 4 return 0;
129 }
130
131 4 static int config_input_main(AVFilterLink *inlink)
132 {
133 4 AlphaMergeContext *s = inlink->dst->priv;
134 4 s->is_packed_rgb =
135
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 6 ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0 &&
136
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 2 inlink->format != AV_PIX_FMT_GBRAP;
137 4 return 0;
138 }
139
140 4 static int config_output(AVFilterLink *outlink)
141 {
142 4 FilterLink *outl = ff_filter_link(outlink);
143 4 AVFilterContext *ctx = outlink->src;
144 4 AlphaMergeContext *s = ctx->priv;
145 4 AVFilterLink *mainlink = ctx->inputs[0];
146 4 FilterLink *ml = ff_filter_link(mainlink);
147 4 AVFilterLink *alphalink = ctx->inputs[1];
148 int ret;
149
150
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 4 if (mainlink->w != alphalink->w || mainlink->h != alphalink->h) {
151 ✗ av_log(ctx, AV_LOG_ERROR,
152 "Input frame sizes do not match (%dx%d vs %dx%d).\n",
153 mainlink->w, mainlink->h,
154 alphalink->w, alphalink->h);
155 ✗ return AVERROR(EINVAL);
156 }
157
158
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 4 if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
159 ✗ return ret;
160
161 4 outlink->w = mainlink->w;
162 4 outlink->h = mainlink->h;
163 4 outlink->time_base = mainlink->time_base;
164 4 outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
165 4 outl->frame_rate = ml->frame_rate;
166
167 4 return ff_framesync_configure(&s->fs);
168 }
169
170 606 static int activate(AVFilterContext *ctx)
171 {
172 606 AlphaMergeContext *s = ctx->priv;
173 606 return ff_framesync_activate(&s->fs);
174 }
175
176 8 static av_cold void uninit(AVFilterContext *ctx)
177 {
178 8 AlphaMergeContext *s = ctx->priv;
179
180 8 ff_framesync_uninit(&s->fs);
181 8 }
182
183 static const AVFilterPad alphamerge_inputs[] = {
184 {
185 .name = "main",
186 .type = AVMEDIA_TYPE_VIDEO,
187 .config_props = config_input_main,
188 },{
189 .name = "alpha",
190 .type = AVMEDIA_TYPE_VIDEO,
191 },
192 };
193
194 static const AVFilterPad alphamerge_outputs[] = {
195 {
196 .name = "default",
197 .type = AVMEDIA_TYPE_VIDEO,
198 .config_props = config_output,
199 },
200 };
201
202 static const AVOption alphamerge_options[] = {
203 { NULL }
204 };
205
206
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 16 FRAMESYNC_DEFINE_CLASS(alphamerge, AlphaMergeContext, fs);
207
208 const FFFilter ff_vf_alphamerge = {
209 .p.name = "alphamerge",
210 .p.description = NULL_IF_CONFIG_SMALL("Copy the luma value of the second "
211 "input into the alpha channel of the first input."),
212 .p.priv_class = &alphamerge_class,
213 .p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
214 .preinit = alphamerge_framesync_preinit,
215 .priv_size = sizeof(AlphaMergeContext),
216 .init = init,
217 FILTER_INPUTS(alphamerge_inputs),
218 FILTER_OUTPUTS(alphamerge_outputs),
219 FILTER_QUERY_FUNC2(query_formats),
220 .uninit = uninit,
221 .activate = activate,
222 };
223