lavfi: add error handling to start_frame().
[libav.git] / libavfilter / vsink_nullsink.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "avfilter.h"
20 #include "internal.h"
21
22 static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
23 {
24 return 0;
25 }
26
27 static void end_frame(AVFilterLink *link)
28 {
29 }
30
31 AVFilter avfilter_vsink_nullsink = {
32 .name = "nullsink",
33 .description = NULL_IF_CONFIG_SMALL("Do absolutely nothing with the input video."),
34
35 .priv_size = 0,
36
37 .inputs = (const AVFilterPad[]) {
38 {
39 .name = "default",
40 .type = AVMEDIA_TYPE_VIDEO,
41 .start_frame = start_frame,
42 .end_frame = end_frame,
43 },
44 { .name = NULL},
45 },
46 .outputs = (const AVFilterPad[]) {{ .name = NULL }},
47 };