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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 | ||
28 | static const enum AVSampleFormat ff_packed_sample_fmts_array[] = { | |
29 | AV_SAMPLE_FMT_U8, | |
30 | AV_SAMPLE_FMT_S16, | |
31 | AV_SAMPLE_FMT_S32, | |
32 | AV_SAMPLE_FMT_FLT, | |
33 | AV_SAMPLE_FMT_DBL, | |
34 | AV_SAMPLE_FMT_NONE | |
35 | }; | |
36 | ||
37 | static const enum AVSampleFormat ff_planar_sample_fmts_array[] = { | |
38 | AV_SAMPLE_FMT_U8P, | |
39 | AV_SAMPLE_FMT_S16P, | |
40 | AV_SAMPLE_FMT_S32P, | |
41 | AV_SAMPLE_FMT_FLTP, | |
42 | AV_SAMPLE_FMT_DBLP, | |
43 | AV_SAMPLE_FMT_NONE | |
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 | */ | |
80 | int ff_filter_samples_framed(AVFilterLink *link, | |
81 | AVFilterBufferRef *samplesref); | |
82 | ||
83 | #endif /* AVFILTER_AUDIO_H */ |