2 * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
4 * This file is part of FFmpeg.
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.
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.
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
23 * Box drawing filter. Also a nice template for a filter that needs to
24 * write in the input frame.
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"
43 unsigned char yuv_color[4];
44 int vsub, hsub; ///< chroma subsampling
47 #define OFFSET(x) offsetof(DrawBoxContext, x)
48 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
50 static const AVOption drawbox_options[] = {
51 { "x", "set the box top-left corner x position", OFFSET(x), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
52 { "y", "set the box top-left corner y position", OFFSET(y), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
53 { "w", "set the box width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
54 { "h", "set the box heigth", OFFSET(h), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
55 { "color", "set the box edge color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
56 { "c", "set the box edge color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
60 AVFILTER_DEFINE_CLASS(drawbox);
62 static av_cold int init(AVFilterContext *ctx, const char *args)
64 DrawBoxContext *drawbox = ctx->priv;
65 uint8_t rgba_color[4];
66 static const char *shorthand[] = { "x", "y", "w", "h", "color", NULL };
69 drawbox->class = &drawbox_class;
70 av_opt_set_defaults(drawbox);
72 if ((ret = av_opt_set_from_string(drawbox, args, shorthand, "=", ":")) < 0)
75 if (av_parse_color(rgba_color, drawbox->color_str, -1, ctx) < 0)
76 return AVERROR(EINVAL);
78 drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
79 drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
80 drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
81 drawbox->yuv_color[A] = rgba_color[3];
86 static av_cold void uninit(AVFilterContext *ctx)
88 DrawBoxContext *drawbox = ctx->priv;
92 static int query_formats(AVFilterContext *ctx)
94 enum AVPixelFormat pix_fmts[] = {
95 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
96 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
97 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
98 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
102 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
106 static int config_input(AVFilterLink *inlink)
108 DrawBoxContext *drawbox = inlink->dst->priv;
109 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
111 drawbox->hsub = desc->log2_chroma_w;
112 drawbox->vsub = desc->log2_chroma_h;
114 if (drawbox->w == 0) drawbox->w = inlink->w;
115 if (drawbox->h == 0) drawbox->h = inlink->h;
117 av_log(inlink->dst, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
118 drawbox->x, drawbox->y, drawbox->w, drawbox->h,
119 drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]);
124 static int draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
126 DrawBoxContext *drawbox = inlink->dst->priv;
127 int plane, x, y, xb = drawbox->x, yb = drawbox->y;
128 unsigned char *row[4];
129 AVFilterBufferRef *picref = inlink->cur_buf;
131 for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + drawbox->h); y++) {
132 row[0] = picref->data[0] + y * picref->linesize[0];
134 for (plane = 1; plane < 3; plane++)
135 row[plane] = picref->data[plane] +
136 picref->linesize[plane] * (y >> drawbox->vsub);
138 for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++) {
139 double alpha = (double)drawbox->yuv_color[A] / 255;
141 if ((y - yb < 3) || (yb + drawbox->h - y < 4) ||
142 (x - xb < 3) || (xb + drawbox->w - x < 4)) {
143 row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawbox->yuv_color[Y];
144 row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U];
145 row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V];
150 return ff_draw_slice(inlink->dst->outputs[0], y0, h, 1);
153 static const AVFilterPad avfilter_vf_drawbox_inputs[] = {
156 .type = AVMEDIA_TYPE_VIDEO,
157 .config_props = config_input,
158 .get_video_buffer = ff_null_get_video_buffer,
159 .start_frame = ff_null_start_frame,
160 .draw_slice = draw_slice,
161 .end_frame = ff_null_end_frame,
162 .min_perms = AV_PERM_WRITE | AV_PERM_READ,
167 static const AVFilterPad avfilter_vf_drawbox_outputs[] = {
170 .type = AVMEDIA_TYPE_VIDEO,
175 AVFilter avfilter_vf_drawbox = {
177 .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
178 .priv_size = sizeof(DrawBoxContext),
182 .query_formats = query_formats,
183 .inputs = avfilter_vf_drawbox_inputs,
184 .outputs = avfilter_vf_drawbox_outputs,
185 .priv_class = &drawbox_class,