Add pad filter.
[libav.git] / libavfilter / vsrc_nullsrc.c
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1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/**
ba87f080 20 * @file
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21 * null video source
22 */
23
24#include "avfilter.h"
25
26typedef struct {
27 int w, h;
28} NullContext;
29
30static int init(AVFilterContext *ctx, const char *args, void *opaque)
31{
32 NullContext *priv = ctx->priv;
33
34 priv->w = 352;
35 priv->h = 288;
36
37 if (args)
38 sscanf(args, "%d:%d", &priv->w, &priv->h);
39
40 if (priv->w <= 0 || priv->h <= 0) {
41 av_log(ctx, AV_LOG_ERROR, "Non-positive size values are not acceptable.\n");
42 return -1;
43 }
44
45 return 0;
46}
47
48static int config_props(AVFilterLink *outlink)
49{
50 NullContext *priv = outlink->src->priv;
51
52 outlink->w = priv->w;
53 outlink->h = priv->h;
54
55 av_log(outlink->src, AV_LOG_INFO, "w:%d h:%d\n", priv->w, priv->h);
56
57 return 0;
58}
59
60static int request_frame(AVFilterLink *link)
61{
62 return -1;
63}
64
65AVFilter avfilter_vsrc_nullsrc = {
66 .name = "nullsrc",
67 .description = "Null video source, never return images.",
68
69 .init = init,
70 .priv_size = sizeof(NullContext),
71
72 .inputs = (AVFilterPad[]) {{ .name = NULL}},
73
74 .outputs = (AVFilterPad[]) {
75 {
76 .name = "default",
72415b2a 77 .type = AVMEDIA_TYPE_VIDEO,
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78 .config_props = config_props,
79 .request_frame = request_frame,
80 },
81 { .name = NULL}
82 },
83};