2 * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
4 * This file is part of Libav.
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.
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.
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
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/pixdesc.h"
29 #include "libavutil/parseutils.h"
39 unsigned char yuv_color[4];
40 int vsub, hsub; ///< chroma subsampling
43 static av_cold int init(AVFilterContext *ctx, const char *args)
45 DrawBoxContext *drawbox= ctx->priv;
46 char color_str[1024] = "black";
47 uint8_t rgba_color[4];
49 drawbox->x = drawbox->y = drawbox->w = drawbox->h = 0;
52 sscanf(args, "%d:%d:%d:%d:%s",
53 &drawbox->x, &drawbox->y, &drawbox->w, &drawbox->h, color_str);
55 if (av_parse_color(rgba_color, color_str, -1, ctx) < 0)
56 return AVERROR(EINVAL);
58 drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
59 drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
60 drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
61 drawbox->yuv_color[A] = rgba_color[3];
66 static int query_formats(AVFilterContext *ctx)
68 enum PixelFormat pix_fmts[] = {
69 PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
70 PIX_FMT_YUV411P, PIX_FMT_YUV410P,
71 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
72 PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
76 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
80 static int config_input(AVFilterLink *inlink)
82 DrawBoxContext *drawbox = inlink->dst->priv;
84 drawbox->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
85 drawbox->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
87 if (drawbox->w == 0) drawbox->w = inlink->w;
88 if (drawbox->h == 0) drawbox->h = inlink->h;
90 av_log(inlink->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
91 drawbox->w, drawbox->y, drawbox->w, drawbox->h,
92 drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]);
97 static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
99 DrawBoxContext *drawbox = inlink->dst->priv;
100 int plane, x, y, xb = drawbox->x, yb = drawbox->y;
101 unsigned char *row[4];
102 AVFilterBufferRef *picref = inlink->cur_buf;
104 for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + drawbox->h); y++) {
105 row[0] = picref->data[0] + y * picref->linesize[0];
107 for (plane = 1; plane < 3; plane++)
108 row[plane] = picref->data[plane] +
109 picref->linesize[plane] * (y >> drawbox->vsub);
111 for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++) {
112 double alpha = (double)drawbox->yuv_color[A] / 255;
114 if ((y - yb < 3) || (yb + drawbox->h - y < 4) ||
115 (x - xb < 3) || (xb + drawbox->w - x < 4)) {
116 row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawbox->yuv_color[Y];
117 row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U];
118 row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V];
123 ff_draw_slice(inlink->dst->outputs[0], y0, h, 1);
126 AVFilter avfilter_vf_drawbox = {
128 .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
129 .priv_size = sizeof(DrawBoxContext),
132 .query_formats = query_formats,
133 .inputs = (AVFilterPad[]) {{ .name = "default",
134 .type = AVMEDIA_TYPE_VIDEO,
135 .config_props = config_input,
136 .get_video_buffer = ff_null_get_video_buffer,
137 .start_frame = ff_null_start_frame,
138 .draw_slice = draw_slice,
139 .end_frame = ff_null_end_frame,
140 .min_perms = AV_PERM_WRITE | AV_PERM_READ,
141 .rej_perms = AV_PERM_PRESERVE },
143 .outputs = (AVFilterPad[]) {{ .name = "default",
144 .type = AVMEDIA_TYPE_VIDEO, },