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 "avfilter.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/colorspace.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/parseutils.h"
32 #include "drawutils.h"
33 
34 typedef struct {
35  int w, h;
36  uint8_t color[4];
38  uint8_t *line[4];
39  int line_step[4];
40  int hsub, vsub;
41  uint64_t pts;
42 } ColorContext;
43 
44 static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
45 {
46  ColorContext *color = ctx->priv;
47  char color_string[128] = "black";
48  char frame_size [128] = "320x240";
49  char frame_rate [128] = "25";
50  AVRational frame_rate_q;
51  int ret;
52 
53  if (args)
54  sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
55 
56  if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
57  av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
58  return AVERROR(EINVAL);
59  }
60 
61  if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
62  frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
63  av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
64  return AVERROR(EINVAL);
65  }
66  color->time_base.num = frame_rate_q.den;
67  color->time_base.den = frame_rate_q.num;
68 
69  if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0)
70  return ret;
71 
72  return 0;
73 }
74 
76 {
77  ColorContext *color = ctx->priv;
78  int i;
79 
80  for (i = 0; i < 4; i++) {
81  av_freep(&color->line[i]);
82  color->line_step[i] = 0;
83  }
84 }
85 
87 {
88  static const enum PixelFormat pix_fmts[] = {
92 
99 
101  };
102 
104  return 0;
105 }
106 
107 static int color_config_props(AVFilterLink *inlink)
108 {
109  AVFilterContext *ctx = inlink->src;
110  ColorContext *color = ctx->priv;
111  uint8_t rgba_color[4];
112  int is_packed_rgba;
113  const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
114 
115  color->hsub = pix_desc->log2_chroma_w;
116  color->vsub = pix_desc->log2_chroma_h;
117 
118  color->w &= ~((1 << color->hsub) - 1);
119  color->h &= ~((1 << color->vsub) - 1);
120  if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
121  return AVERROR(EINVAL);
122 
123  memcpy(rgba_color, color->color, sizeof(rgba_color));
124  ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
125  inlink->format, rgba_color, &is_packed_rgba, NULL);
126 
127  av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
128  color->w, color->h, color->time_base.den, color->time_base.num,
129  color->color[0], color->color[1], color->color[2], color->color[3],
130  is_packed_rgba ? "rgba" : "yuva");
131  inlink->w = color->w;
132  inlink->h = color->h;
133  inlink->time_base = color->time_base;
134 
135  return 0;
136 }
137 
139 {
140  ColorContext *color = link->src->priv;
141  AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
142  picref->video->pixel_aspect = (AVRational) {1, 1};
143  picref->pts = color->pts++;
144  picref->pos = -1;
145 
146  avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
147  ff_draw_rectangle(picref->data, picref->linesize,
148  color->line, color->line_step, color->hsub, color->vsub,
149  0, 0, color->w, color->h);
150  avfilter_draw_slice(link, 0, color->h, 1);
151  avfilter_end_frame(link);
152  avfilter_unref_buffer(picref);
153 
154  return 0;
155 }
156 
158  .name = "color",
159  .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
160 
161  .priv_size = sizeof(ColorContext),
162  .init = color_init,
163  .uninit = color_uninit,
164 
166 
167  .inputs = (AVFilterPad[]) {{ .name = NULL}},
168 
169  .outputs = (AVFilterPad[]) {{ .name = "default",
170  .type = AVMEDIA_TYPE_VIDEO,
171  .request_frame = color_request_frame,
172  .config_props = color_config_props },
173  { .name = NULL}},
174 };