source: src/io/source.h @ b40c149

feature/autosinkfeature/constantqfeature/pitchshiftfeature/timestretch
Last change on this file since b40c149 was be94d24, checked in by Paul Brossier <piem@piem.org>, 12 months ago

[doc] remove reference to test-source_multi

  • Property mode set to 100644
File size: 4.8 KB
Line 
1/*
2  Copyright (C) 2012-2013 Paul Brossier <piem@aubio.org>
3
4  This file is part of aubio.
5
6  aubio is free software: you can redistribute it and/or modify
7  it under the terms of the GNU General Public License as published by
8  the Free Software Foundation, either version 3 of the License, or
9  (at your option) any later version.
10
11  aubio is distributed in the hope that it will be useful,
12  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  GNU General Public License for more details.
15
16  You should have received a copy of the GNU General Public License
17  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
18
19*/
20
21#ifndef AUBIO_SOURCE_H
22#define AUBIO_SOURCE_H
23
24/** \file
25
26  Media source to read blocks of consecutive audio samples from file.
27
28  To write to file, use ::aubio_sink_t.
29
30  Depending on how aubio was compiled, the following sources will be available.
31
32  When creating a new source using ::new_aubio_source, the new function of each
33  of the compiled-in sources will be used, in the following order, until one of
34  them gets successfully created. If all sources returned NULL,
35  ::new_aubio_source will return NULL.
36
37  \b \p source_avcodec : libav
38
39  aubio can be optionally compiled with [libav](http://libav.org), which can
40  read from a very large number of audio and video formats, including over
41  different network protocols such as HTTP.
42
43  \b \p source_apple_audio : ExtAudioFileRef
44
45  On Mac and iOS platforms, aubio should be compiled with CoreAudio [Extended
46  Audio File Services]
47  (https://developer.apple.com/library/mac/documentation/MusicAudio/Reference/ExtendedAudioFileServicesReference/Reference/reference.html).
48  This provides access to most common audio file formats, including compressed
49  ones.
50
51  \b \p source_sndfile : libsndfile
52
53  Also optional, aubio can be built against
54  [libsndfile](http://www.mega-nerd.com/libsndfile/), which can read [most
55  uncompressed formats](http://www.mega-nerd.com/libsndfile/#Features).
56
57  \b \p source_wavread : native WAV reader
58
59  A simple source to read from 16-bits PCM RIFF encoded WAV files.
60
61  \example io/test-source.c
62
63*/
64
65#ifdef __cplusplus
66extern "C" {
67#endif
68
69/** media source object */
70typedef struct _aubio_source_t aubio_source_t;
71
72/**
73
74  create new ::aubio_source_t
75
76  \param uri the file path or uri to read from
77  \param samplerate sampling rate to view the fie at
78  \param hop_size the size of the blocks to read from
79
80  Creates a new source object. If `0` is passed as `samplerate`, the sample
81  rate of the original file is used.
82
83  The samplerate of newly created source can be obtained using
84  ::aubio_source_get_samplerate.
85
86*/
87aubio_source_t * new_aubio_source(const char_t * uri, uint_t samplerate, uint_t hop_size);
88
89/**
90
91  read monophonic vector of length hop_size from source object
92
93  \param s source object, created with ::new_aubio_source
94  \param read_to ::fvec_t of data to read to
95  \param read upon returns, equals to number of frames actually read
96
97  Upon returns, `read` contains the number of frames actually read from the
98  source. `hop_size` if enough frames could be read, less otherwise.
99
100*/
101void aubio_source_do(aubio_source_t * s, fvec_t * read_to, uint_t * read);
102
103/**
104
105  read polyphonic vector of length hop_size from source object
106
107  \param s source object, created with ::new_aubio_source
108  \param read_to ::fmat_t of data to read to
109  \param[out] read upon returns, equals to number of frames actually read
110
111  Upon returns, `read` contains the number of frames actually read from the
112  source. `hop_size` if enough frames could be read, less otherwise.
113
114*/
115void aubio_source_do_multi(aubio_source_t * s, fmat_t * read_to, uint_t * read);
116
117/**
118
119  get samplerate of source object
120
121  \param s source object, created with ::new_aubio_source
122  \return samplerate, in Hz
123
124*/
125uint_t aubio_source_get_samplerate(aubio_source_t * s);
126
127/**
128
129  get channels of source object
130
131  \param s source object, created with ::new_aubio_source
132  \return channels
133
134*/
135uint_t aubio_source_get_channels (aubio_source_t * s);
136
137/**
138
139  seek source object
140
141  \param s source object, created with ::new_aubio_source
142  \param pos position to seek to, in frames
143
144  \return 0 if sucessful, non-zero on failure
145
146*/
147uint_t aubio_source_seek (aubio_source_t * s, uint_t pos);
148
149/**
150
151  get the duration of source object, in frames
152
153  \param s source object, created with ::new_aubio_source
154  \return number of frames in file
155
156*/
157uint_t aubio_source_get_duration (aubio_source_t * s);
158
159/**
160
161  close source object
162
163  \param s source object, created with ::new_aubio_source
164
165  \return 0 if sucessful, non-zero on failure
166
167 */
168uint_t aubio_source_close (aubio_source_t *s);
169
170/**
171
172  close source and cleanup memory
173
174  \param s source object, created with ::new_aubio_source
175
176*/
177void del_aubio_source(aubio_source_t * s);
178
179#ifdef __cplusplus
180}
181#endif
182
183#endif /* AUBIO_SOURCE_H */
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