source: src/musicutils.h @ 229d050

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since 229d050 was 33cd81f, checked in by Paul Brossier <piem@piem.org>, 12 years ago

src/musicutils.h: add fvec_set_window

  • Property mode set to 100644
File size: 3.7 KB
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1/*
2  Copyright (C) 2003-2009 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/** @file
22 *  various functions useful in audio signal processing
23 */
24
25#ifndef MUSICUTILS_H
26#define MUSICUTILS_H
27
28#ifdef __cplusplus
29extern "C" {
30#endif
31
32/** create window
33 
34  References:
35   
36    - <a href="http://en.wikipedia.org/wiki/Window_function">Window
37function</a> on Wikipedia
38    - Amalia de Götzen, Nicolas Bernardini, and Daniel Arfib. Traditional (?)
39implementations of a phase vocoder: the tricks of the trade. In Proceedings of
40the International Conference on Digital Audio Effects (DAFx-00), pages 37–44,
41Uni- versity of Verona, Italy, 2000.
42  (<a href="http://profs.sci.univr.it/%7Edafx/Final-Papers/ps/Bernardini.ps.gz">
43  ps.gz</a>)
44
45*/
46fvec_t *new_aubio_window (char_t * window_type, uint_t size);
47
48/** set elements of a vector to window coefficients
49
50 */
51uint_t fvec_set_window (fvec_t * window, char_t * window_type);
52
53/** compute the principal argument
54
55  This function maps the input phase to its corresponding value wrapped in the
56range \f$ [-\pi, \pi] \f$.
57
58  \param phase unwrapped phase to map to the unit circle
59 
60  \return equivalent phase wrapped to the unit circle
61
62*/
63smpl_t aubio_unwrap2pi (smpl_t phase);
64
65/** convert frequency bin to midi value */
66smpl_t aubio_bintomidi (smpl_t bin, smpl_t samplerate, smpl_t fftsize);
67
68/** convert midi value to frequency bin */
69smpl_t aubio_miditobin (smpl_t midi, smpl_t samplerate, smpl_t fftsize);
70
71/** convert frequency bin to frequency (Hz) */
72smpl_t aubio_bintofreq (smpl_t bin, smpl_t samplerate, smpl_t fftsize);
73
74/** convert frequency (Hz) to frequency bin */
75smpl_t aubio_freqtobin (smpl_t freq, smpl_t samplerate, smpl_t fftsize);
76
77/** convert frequency (Hz) to midi value (0-128) */
78smpl_t aubio_freqtomidi (smpl_t freq);
79
80/** convert midi value (0-128) to frequency (Hz) */
81smpl_t aubio_miditofreq (smpl_t midi);
82
83/** clean up cached memory at the end of program
84 
85  This function should be used at the end of programs to purge all cached
86  memory. So far it is only useful to clean FFTW's cache.
87
88*/
89void aubio_cleanup (void);
90
91/** zero-crossing rate (ZCR)
92
93  The zero-crossing rate is the number of times a signal changes sign,
94  divided by the length of this signal.
95
96  \param v vector to compute ZCR from
97
98  \return zero-crossing rate of v
99
100*/
101smpl_t aubio_zero_crossing_rate (fvec_t * v);
102
103/** compute sound pressure level (SPL) in dB
104
105  This quantity is often wrongly called 'loudness'.
106
107  \param v vector to compute dB SPL from
108
109  \return level of v in dB SPL
110
111*/
112smpl_t aubio_db_spl (fvec_t * v);
113
114/** check if buffer level in dB SPL is under a given threshold
115 
116  \param v vector to get level from
117  \param threshold threshold in dB SPL
118
119  \return 0 if level is under the given threshold, 1 otherwise
120
121*/
122uint_t aubio_silence_detection (fvec_t * v, smpl_t threshold);
123
124/** get buffer level if level >= threshold, 1. otherwise
125
126  \param v vector to get level from
127  \param threshold threshold in dB SPL
128
129  \return level in dB SPL if level >= threshold, 1. otherwise
130
131*/
132smpl_t aubio_level_detection (fvec_t * v, smpl_t threshold);
133
134#ifdef __cplusplus
135}
136#endif
137
138#endif
139
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