1 /*
2 * Copyright (c) Stefano Sabatini | stefasab at gmail.com
3 * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
26
30
32 {
34 }
35
37 {
40 int ret;
41
43
44 if (!frame)
46
53 if (ret < 0) {
56 }
57
60
61
63 }
64
66 {
68
71
72 if (!ret)
74
75 return ret;
76 }
void av_frame_set_channels(AVFrame *frame, int val)
This structure describes decoded (raw) audio or video data.
Main libavfilter public API header.
AVFilterPad * dstpad
input pad on the dest filter
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
A link between two filters.
int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)
Fill an audio buffer with silence.
int sample_rate
samples per second
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
simple assert() macros that are a bit more flexible than ISO C assert().
uint64_t channel_layout
Channel layout of the audio data.
audio channel layout utility functions
AVFrame * ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
get_audio_buffer() handler for filters which simply pass audio along
int format
agreed upon media format
AVFrame *(* get_audio_buffer)(AVFilterLink *link, int nb_samples)
Callback function to get an audio buffer.
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Libavcodec external API header.
int sample_rate
Sample rate of the audio data.
AVFilterLink ** outputs
array of pointers to output links
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
common internal and external API header
AVFrame * ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
default handler for get_audio_buffer() for audio inputs
uint64_t channel_layout
channel layout of current buffer (see libavutil/channel_layout.h)
int channels
Number of channels.
AVFilterContext * dst
dest filter
uint8_t ** extended_data
pointers to the data planes/channels.
int nb_samples
number of audio samples (per channel) described by this frame