Libav
vf_drawbox.c
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1 /*
2  * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
27 #include "libavutil/colorspace.h"
28 #include "libavutil/common.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/pixdesc.h"
31 #include "libavutil/parseutils.h"
32 #include "avfilter.h"
33 #include "formats.h"
34 #include "internal.h"
35 #include "video.h"
36 
37 enum { Y, U, V, A };
38 
39 typedef struct {
40  const AVClass *class;
41  int x, y, w_opt, h_opt, w, h;
42  char *color_str;
43  unsigned char yuv_color[4];
44  int vsub, hsub;
46 
47 static av_cold int init(AVFilterContext *ctx)
48 {
49  DrawBoxContext *s = ctx->priv;
50  uint8_t rgba_color[4];
51 
52  if (av_parse_color(rgba_color, s->color_str, -1, ctx) < 0)
53  return AVERROR(EINVAL);
54 
55  s->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
56  s->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
57  s->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
58  s->yuv_color[A] = rgba_color[3];
59 
60  return 0;
61 }
62 
64 {
65  enum AVPixelFormat pix_fmts[] = {
71  };
72 
74  return 0;
75 }
76 
77 static int config_input(AVFilterLink *inlink)
78 {
79  DrawBoxContext *s = inlink->dst->priv;
80  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
81 
82  s->hsub = desc->log2_chroma_w;
83  s->vsub = desc->log2_chroma_h;
84 
85  s->w = (s->w_opt > 0) ? s->w_opt : inlink->w;
86  s->h = (s->h_opt > 0) ? s->h_opt : inlink->h;
87 
88  av_log(inlink->dst, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
89  s->w, s->y, s->w, s->h,
90  s->yuv_color[Y], s->yuv_color[U], s->yuv_color[V], s->yuv_color[A]);
91 
92  return 0;
93 }
94 
95 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
96 {
97  DrawBoxContext *s = inlink->dst->priv;
98  int plane, x, y, xb = s->x, yb = s->y;
99  unsigned char *row[4];
100 
101  for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->h); y++) {
102  row[0] = frame->data[0] + y * frame->linesize[0];
103 
104  for (plane = 1; plane < 3; plane++)
105  row[plane] = frame->data[plane] +
106  frame->linesize[plane] * (y >> s->vsub);
107 
108  for (x = FFMAX(xb, 0); x < (xb + s->w) && x < frame->width; x++) {
109  double alpha = (double)s->yuv_color[A] / 255;
110 
111  if ((y - yb < 3) || (yb + s->h - y < 4) ||
112  (x - xb < 3) || (xb + s->w - x < 4)) {
113  row[0][x ] = (1 - alpha) * row[0][x ] + alpha * s->yuv_color[Y];
114  row[1][x >> s->hsub] = (1 - alpha) * row[1][x >> s->hsub] + alpha * s->yuv_color[U];
115  row[2][x >> s->hsub] = (1 - alpha) * row[2][x >> s->hsub] + alpha * s->yuv_color[V];
116  }
117  }
118  }
119 
120  return ff_filter_frame(inlink->dst->outputs[0], frame);
121 }
122 
123 #define OFFSET(x) offsetof(DrawBoxContext, x)
124 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
125 static const AVOption options[] = {
126  { "x", "Horizontal position of the left box edge", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
127  { "y", "Vertical position of the top box edge", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
128  { "width", "Width of the box", OFFSET(w_opt), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
129  { "height", "Height of the box", OFFSET(h_opt), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
130  { "color", "Color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
131  { NULL },
132 };
133 
134 static const AVClass drawbox_class = {
135  .class_name = "drawbox",
136  .item_name = av_default_item_name,
137  .option = options,
138  .version = LIBAVUTIL_VERSION_INT,
139 };
140 
142  {
143  .name = "default",
144  .type = AVMEDIA_TYPE_VIDEO,
145  .config_props = config_input,
146  .get_video_buffer = ff_null_get_video_buffer,
147  .filter_frame = filter_frame,
148  .needs_writable = 1,
149  },
150  { NULL }
151 };
152 
154  {
155  .name = "default",
156  .type = AVMEDIA_TYPE_VIDEO,
157  },
158  { NULL }
159 };
160 
162  .name = "drawbox",
163  .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
164  .priv_size = sizeof(DrawBoxContext),
165  .priv_class = &drawbox_class,
166  .init = init,
167 
169  .inputs = avfilter_vf_drawbox_inputs,
170  .outputs = avfilter_vf_drawbox_outputs,
171 };