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/parseutils.h"
40 #include "drawutils.h"
41 
42 typedef struct {
43  int w, h;
47  int line_step[4];
48  int hsub, vsub;
49  uint64_t pts;
50 } ColorContext;
51 
52 static av_cold int color_init(AVFilterContext *ctx, const char *args)
53 {
54  ColorContext *color = ctx->priv;
55  char color_string[128] = "black";
56  char frame_size [128] = "320x240";
57  char frame_rate [128] = "25";
58  AVRational frame_rate_q;
59  int ret;
60 
61  if (args)
62  sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
63 
64  if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
65  av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
66  return AVERROR(EINVAL);
67  }
68 
69  if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
70  frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
71  av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
72  return AVERROR(EINVAL);
73  }
74  color->time_base.num = frame_rate_q.den;
75  color->time_base.den = frame_rate_q.num;
76 
77  if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0)
78  return ret;
79 
80  return 0;
81 }
82 
84 {
85  ColorContext *color = ctx->priv;
86  int i;
87 
88  for (i = 0; i < 4; i++) {
89  av_freep(&color->line[i]);
90  color->line_step[i] = 0;
91  }
92 }
93 
95 {
96  static const enum AVPixelFormat pix_fmts[] = {
100 
107 
109  };
110 
112  return 0;
113 }
114 
115 static int color_config_props(AVFilterLink *inlink)
116 {
117  AVFilterContext *ctx = inlink->src;
118  ColorContext *color = ctx->priv;
119  uint8_t rgba_color[4];
120  int is_packed_rgba;
121  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
122 
123  color->hsub = pix_desc->log2_chroma_w;
124  color->vsub = pix_desc->log2_chroma_h;
125 
126  color->w &= ~((1 << color->hsub) - 1);
127  color->h &= ~((1 << color->vsub) - 1);
128  if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
129  return AVERROR(EINVAL);
130 
131  memcpy(rgba_color, color->color, sizeof(rgba_color));
132  ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
133  inlink->format, rgba_color, &is_packed_rgba, NULL);
134 
135  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
136  color->w, color->h, color->time_base.den, color->time_base.num,
137  color->color[0], color->color[1], color->color[2], color->color[3],
138  is_packed_rgba ? "rgba" : "yuva");
139  inlink->w = color->w;
140  inlink->h = color->h;
141  inlink->time_base = color->time_base;
142 
143  return 0;
144 }
145 
147 {
148  ColorContext *color = link->src->priv;
149  AVFilterBufferRef *picref = ff_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
150 
151  if (!picref)
152  return AVERROR(ENOMEM);
153 
154  picref->video->pixel_aspect = (AVRational) {1, 1};
155  picref->pts = color->pts++;
156  picref->pos = -1;
157 
158  ff_draw_rectangle(picref->data, picref->linesize,
159  color->line, color->line_step, color->hsub, color->vsub,
160  0, 0, color->w, color->h);
161  return ff_filter_frame(link, picref);
162 }
163 
165  {
166  .name = "default",
167  .type = AVMEDIA_TYPE_VIDEO,
168  .request_frame = color_request_frame,
169  .config_props = color_config_props
170  },
171  { NULL }
172 };
173 
175  .name = "color",
176  .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
177 
178  .priv_size = sizeof(ColorContext),
179  .init = color_init,
180  .uninit = color_uninit,
181 
183 
184  .inputs = NULL,
185 
186  .outputs = avfilter_vsrc_color_outputs,
187 };