h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / asrc_anullsrc.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 /**
20 * @file
21 * null audio source
22 */
23
24 #include <inttypes.h>
25 #include <stdio.h>
26
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/internal.h"
29 #include "avfilter.h"
30 #include "internal.h"
31
32 static int request_frame(AVFilterLink *link)
33 {
34 return AVERROR_EOF;
35 }
36
37 static const AVFilterPad avfilter_asrc_anullsrc_outputs[] = {
38 {
39 .name = "default",
40 .type = AVMEDIA_TYPE_AUDIO,
41 .request_frame = request_frame,
42 },
43 { NULL }
44 };
45
46 AVFilter ff_asrc_anullsrc = {
47 .name = "anullsrc",
48 .description = NULL_IF_CONFIG_SMALL("Null audio source, never return audio frames."),
49
50 .inputs = NULL,
51
52 .outputs = avfilter_asrc_anullsrc_outputs,
53 };