source: src/pitch/pitchspecacf.h @ f0dd5fb

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since f0dd5fb was 95dc7f2, checked in by Paul Brossier <piem@piem.org>, 11 years ago

src/pitch/: add first draft for specacf

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1/*
2  Copyright (C) 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/** \file
22
23  Pitch detection using spectral auto correlation
24
25  This algorithm implements pitch detection by computing the autocorrelation
26  function as the cosine transform of the square spectral magnitudes.
27
28  Anssi Klapuri. Qualitative and quantitative aspects in the design of
29  periodicity esti- mation algorithms. In Proceedings of the European Signal
30  Processing Conference (EUSIPCO), 2000.
31
32  Paul Brossier, [Automatic annotation of musical audio for interactive
33  systems](http://aubio.org/phd/), Chapter 3, Pitch Analysis, Autocorrelation,
34  pp. 75-77, PhD thesis, Centre for Digital music, Queen Mary University of
35  London, London, UK, 2006.
36
37  \example pitch/test-pitchspecacf.c
38
39*/
40
41#ifndef AUBIO_PITCHSPECACF_H
42#define AUBIO_PITCHSPECACF_H
43
44#ifdef __cplusplus
45extern "C" {
46#endif
47
48/** pitch detection object */
49typedef struct _aubio_pitchspecacf_t aubio_pitchspecacf_t;
50
51/** execute pitch detection on an input buffer
52
53  \param o pitch detection object as returned by new_aubio_pitchspecacf
54  \param samples_in input signal vector (length as specified at creation time)
55  \param cands_out pitch period candidates, in samples
56
57*/
58void aubio_pitchspecacf_do (aubio_pitchspecacf_t * o, fvec_t * samples_in, fvec_t * cands_out);
59/** creation of the pitch detection object
60
61  \param buf_size size of the input buffer to analyse
62
63*/
64aubio_pitchspecacf_t *new_aubio_pitchspecacf (uint_t buf_size);
65/** deletion of the pitch detection object
66
67  \param o pitch detection object as returned by new_aubio_pitchspecacf()
68
69*/
70void del_aubio_pitchspecacf (aubio_pitchspecacf_t * o);
71
72/** get tolerance parameter for `specacf` pitch detection object
73
74  \param o pitch detection object
75
76  \return tolerance parameter for minima selection [default 1.]
77
78*/
79smpl_t aubio_pitchspecacf_get_tolerance (aubio_pitchspecacf_t * o);
80
81/** set tolerance parameter for `specacf` pitch detection object
82
83  \param o pitch detection object
84  \param tol tolerance parameter for minima selection [default 1.]
85
86  \return `1` on error, `0` on success
87
88*/
89uint_t aubio_pitchspecacf_set_tolerance (aubio_pitchspecacf_t * o, smpl_t tol);
90
91/** get currenct confidence for `specacf` pitch detection object
92
93  \param o pitch detection object
94  \return confidence parameter
95
96*/
97smpl_t aubio_pitchspecacf_get_confidence (aubio_pitchspecacf_t * o);
98
99#ifdef __cplusplus
100}
101#endif
102
103#endif /*AUBIO_PITCHSPECACF_H*/
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