Libav
vsrc_color.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
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 
26 #include <stdio.h>
27 #include <string.h>
28 
29 #include "avfilter.h"
30 #include "formats.h"
31 #include "internal.h"
32 #include "video.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/colorspace.h"
35 #include "libavutil/imgutils.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/mem.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/parseutils.h"
41 #include "drawutils.h"
42 
43 typedef struct {
44  const AVClass *class;
45  int w, h;
49  int line_step[4];
50  int hsub, vsub;
51  uint64_t pts;
52  char *color_str;
53  char *size_str;
55 } ColorContext;
56 
58 {
59  ColorContext *color = ctx->priv;
60  AVRational frame_rate_q;
61  int ret;
62 
63  if (av_parse_video_size(&color->w, &color->h, color->size_str) < 0) {
64  av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", color->size_str);
65  return AVERROR(EINVAL);
66  }
67 
68  if (av_parse_video_rate(&frame_rate_q, color->framerate_str) < 0 ||
69  frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
70  av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", color->framerate_str);
71  return AVERROR(EINVAL);
72  }
73  color->time_base.num = frame_rate_q.den;
74  color->time_base.den = frame_rate_q.num;
75 
76  if ((ret = av_parse_color(color->color, color->color_str, -1, ctx)) < 0)
77  return ret;
78 
79  return 0;
80 }
81 
83 {
84  ColorContext *color = ctx->priv;
85  int i;
86 
87  for (i = 0; i < 4; i++) {
88  av_freep(&color->line[i]);
89  color->line_step[i] = 0;
90  }
91 }
92 
94 {
95  static const enum AVPixelFormat pix_fmts[] = {
99 
106 
108  };
109 
111  return 0;
112 }
113 
114 static int color_config_props(AVFilterLink *inlink)
115 {
116  AVFilterContext *ctx = inlink->src;
117  ColorContext *color = ctx->priv;
118  uint8_t rgba_color[4];
119  int is_packed_rgba;
120  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
121 
122  color->hsub = pix_desc->log2_chroma_w;
123  color->vsub = pix_desc->log2_chroma_h;
124 
125  color->w &= ~((1 << color->hsub) - 1);
126  color->h &= ~((1 << color->vsub) - 1);
127  if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
128  return AVERROR(EINVAL);
129 
130  memcpy(rgba_color, color->color, sizeof(rgba_color));
131  ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
132  inlink->format, rgba_color, &is_packed_rgba, NULL);
133 
134  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
135  color->w, color->h, color->time_base.den, color->time_base.num,
136  color->color[0], color->color[1], color->color[2], color->color[3],
137  is_packed_rgba ? "rgba" : "yuva");
138  inlink->w = color->w;
139  inlink->h = color->h;
140  inlink->time_base = color->time_base;
141 
142  return 0;
143 }
144 
146 {
147  ColorContext *color = link->src->priv;
148  AVFrame *frame = ff_get_video_buffer(link, color->w, color->h);
149 
150  if (!frame)
151  return AVERROR(ENOMEM);
152 
153  frame->sample_aspect_ratio = (AVRational) {1, 1};
154  frame->pts = color->pts++;
155 
156  ff_draw_rectangle(frame->data, frame->linesize,
157  color->line, color->line_step, color->hsub, color->vsub,
158  0, 0, color->w, color->h);
159  return ff_filter_frame(link, frame);
160 }
161 
162 #define OFFSET(x) offsetof(ColorContext, x)
163 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
164 static const AVOption options[] = {
165  { "color", "Output video color", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
166  { "size", "Output video size (wxh or an abbreviation)", OFFSET(size_str), AV_OPT_TYPE_STRING, { .str = "320x240" }, .flags = FLAGS },
167  { "framerate", "Output video framerate", OFFSET(framerate_str), AV_OPT_TYPE_STRING, { .str = "25" }, .flags = FLAGS },
168  { NULL },
169 };
170 
171 static const AVClass color_class = {
172  .class_name = "color",
173  .item_name = av_default_item_name,
174  .option = options,
175  .version = LIBAVUTIL_VERSION_INT,
176 };
177 
179  {
180  .name = "default",
181  .type = AVMEDIA_TYPE_VIDEO,
182  .request_frame = color_request_frame,
183  .config_props = color_config_props
184  },
185  { NULL }
186 };
187 
189  .name = "color",
190  .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
191 
192  .priv_class = &color_class,
193  .priv_size = sizeof(ColorContext),
194  .init = color_init,
195  .uninit = color_uninit,
196 
198 
199  .inputs = NULL,
200 
201  .outputs = avfilter_vsrc_color_outputs,
202 };