h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / audio.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 "libavutil/channel_layout.h"
20 #include "libavutil/common.h"
21
22 #include "audio.h"
23 #include "avfilter.h"
24 #include "internal.h"
25
26 AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
27 {
28 return ff_get_audio_buffer(link->dst->outputs[0], nb_samples);
29 }
30
31 AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
32 {
33 AVFrame *frame = av_frame_alloc();
34 int channels = av_get_channel_layout_nb_channels(link->channel_layout);
35 int ret;
36
37 if (!frame)
38 return NULL;
39
40 frame->nb_samples = nb_samples;
41 frame->format = link->format;
42 frame->channel_layout = link->channel_layout;
43 frame->sample_rate = link->sample_rate;
44 ret = av_frame_get_buffer(frame, 0);
45 if (ret < 0) {
46 av_frame_free(&frame);
47 return NULL;
48 }
49
50 av_samples_set_silence(frame->extended_data, 0, nb_samples, channels,
51 link->format);
52
53
54 return frame;
55 }
56
57 AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
58 {
59 AVFrame *ret = NULL;
60
61 if (link->dstpad->get_audio_buffer)
62 ret = link->dstpad->get_audio_buffer(link, nb_samples);
63
64 if (!ret)
65 ret = ff_default_get_audio_buffer(link, nb_samples);
66
67 return ret;
68 }