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audio.h
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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 
22 #ifndef AVFILTER_AUDIO_H
23 #define AVFILTER_AUDIO_H
24 
25 #include "avfilter.h"
26 #include "internal.h"
27 
35 };
36 
44 };
45 
46 /** default handler for get_audio_buffer() for audio inputs */
47 AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples);
48 
49 /** get_audio_buffer() handler for filters which simply pass audio along */
50 AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples);
51 
52 /**
53  * Request an audio samples buffer with a specific set of permissions.
54  *
55  * @param link the output link to the filter from which the buffer will
56  * be requested
57  * @param nb_samples the number of samples per channel
58  * @return A reference to the samples. This must be unreferenced with
59  * avfilter_unref_buffer when you are finished with it.
60  */
61 AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples);
62 
63 /**
64  * Send a buffer of audio samples to the next filter.
65  *
66  * @param link the output link over which the audio samples are being sent
67  * @param samplesref a reference to the buffer of audio samples being sent. The
68  * receiving filter will free this reference when it no longer
69  * needs it or pass it on to the next filter.
70  *
71  * @return >= 0 on success, a negative AVERROR on error. The receiving filter
72  * is responsible for unreferencing samplesref in case of error.
73  */
74 int ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
75 
76 /**
77  * Send a buffer of audio samples to the next link, without checking
78  * min_samples.
79  */
81  AVFilterBufferRef *samplesref);
82 
83 #endif /* AVFILTER_AUDIO_H */