2 Copyright (C) 2012-2013 Paul Brossier <piem@aubio.org>
4 This file is part of aubio.
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.
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.
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/>.
21 #ifndef AUBIO_SOURCE_H
22 #define AUBIO_SOURCE_H
26 Media source to read blocks of consecutive audio samples from file.
28 To write to file, use ::aubio_sink_t.
30 Depending on how aubio was compiled, the following sources will be available.
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.
37 \b \p source_avcodec : libav
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.
43 \b \p source_apple_audio : ExtAudioFileRef
45 On Mac and iOS platforms, aubio should be compiled with CoreAudio [Extended
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
51 \b \p source_sndfile : libsndfile
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).
57 \b \p source_wavread : native WAV reader
59 A simple source to read from 16-bits PCM RIFF encoded WAV files.
61 \example io/test-source.c
62 \example io/test-source_multi.c
70 /** media source object */
71 typedef struct _aubio_source_t aubio_source_t;
75 create new ::aubio_source_t
77 \param uri the file path or uri to read from
78 \param samplerate sampling rate to view the fie at
79 \param hop_size the size of the blocks to read from
81 Creates a new source object. If `0` is passed as `samplerate`, the sample
82 rate of the original file is used.
84 The samplerate of newly created source can be obtained using
85 ::aubio_source_get_samplerate.
88 aubio_source_t * new_aubio_source(const char_t * uri, uint_t samplerate, uint_t hop_size);
92 read monophonic vector of length hop_size from source object
94 \param s source object, created with ::new_aubio_source
95 \param read_to ::fvec_t of data to read to
96 \param read upon returns, equals to number of frames actually read
98 Upon returns, `read` contains the number of frames actually read from the
99 source. `hop_size` if enough frames could be read, less otherwise.
102 void aubio_source_do(aubio_source_t * s, fvec_t * read_to, uint_t * read);
106 read polyphonic vector of length hop_size from source object
108 \param s source object, created with ::new_aubio_source
109 \param read_to ::fmat_t of data to read to
110 \param[out] read upon returns, equals to number of frames actually read
112 Upon returns, `read` contains the number of frames actually read from the
113 source. `hop_size` if enough frames could be read, less otherwise.
116 void aubio_source_do_multi(aubio_source_t * s, fmat_t * read_to, uint_t * read);
120 get samplerate of source object
122 \param s source object, created with ::new_aubio_source
123 \return samplerate, in Hz
126 uint_t aubio_source_get_samplerate(aubio_source_t * s);
130 get channels of source object
132 \param s source object, created with ::new_aubio_source
136 uint_t aubio_source_get_channels (aubio_source_t * s);
142 \param s source object, created with ::new_aubio_source
143 \param pos position to seek to, in frames
145 \return 0 if sucessful, non-zero on failure
148 uint_t aubio_source_seek (aubio_source_t * s, uint_t pos);
152 get the duration of source object, in frames
154 \param s source object, created with ::new_aubio_source
155 \return number of frames in file
158 uint_t aubio_source_get_duration (aubio_source_t * s);
164 \param s source object, created with ::new_aubio_source
166 \return 0 if sucessful, non-zero on failure
169 uint_t aubio_source_close (aubio_source_t *s);
173 close source and cleanup memory
175 \param s source object, created with ::new_aubio_source
178 void del_aubio_source(aubio_source_t * s);
184 #endif /* AUBIO_SOURCE_H */