source: src/pitch/pitch.h @ 3a004bbc

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5sampleryinfft+
Last change on this file since 3a004bbc was 0cf2b44, checked in by Paul Brossier <piem@piem.org>, 8 years ago

src/pitch/pitch.h: add aubio_pitch_get_tolerance

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1/*
2  Copyright (C) 2003-2013 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_PITCH_H
22#define AUBIO_PITCH_H
23
24#ifdef __cplusplus
25extern "C" {
26#endif
27
28/** \file
29
30  Pitch detection object
31
32  This file creates the objects required for the computation of the selected
33  pitch detection algorithm and output the results, in midi note or Hz.
34
35  \section pitch Pitch detection methods
36
37  A list of the pitch detection methods currently available follows.
38
39  \b \p default : use the default method
40
41  Currently, the default method is set to \p yinfft .
42
43  \b \p schmitt : Schmitt trigger
44
45  This pitch extraction method implements a Schmitt trigger to estimate the
46  period of a signal.
47
48  This file was derived from the tuneit project, written by Mario Lang to
49  detect the fundamental frequency of a sound.
50
51  See http://delysid.org/tuneit.html
52
53  \b \p fcomb : a fast harmonic comb filter
54
55  This pitch extraction method implements a fast harmonic comb filter to
56  determine the fundamental frequency of a harmonic sound.
57
58  This file was derived from the tuneit project, written by Mario Lang to
59  detect the fundamental frequency of a sound.
60
61  See http://delysid.org/tuneit.html
62
63  \b \p mcomb : multiple-comb filter
64
65  This fundamental frequency estimation algorithm implements spectral
66  flattening, multi-comb filtering and peak histogramming.
67
68  This method was designed by Juan P. Bello and described in:
69
70  Juan-Pablo Bello. ``Towards the Automated Analysis of Simple Polyphonic
71  Music''.  PhD thesis, Centre for Digital Music, Queen Mary University of
72  London, London, UK, 2003.
73
74  \b \p yin : YIN algorithm
75
76  This algorithm was developed by A. de Cheveigne and H. Kawahara and
77  published in:
78
79  De Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
80  estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
81
82  see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
83
84  \b \p yinfft : Yinfft algorithm
85
86  This algorithm was derived from the YIN algorithm. In this implementation, a
87  Fourier transform is used to compute a tapered square difference function,
88  which allows spectral weighting. Because the difference function is tapered,
89  the selection of the period is simplified.
90
91  Paul Brossier, [Automatic annotation of musical audio for interactive
92  systems](http://aubio.org/phd/), Chapter 3, Pitch Analysis, PhD thesis,
93  Centre for Digital music, Queen Mary University of London, London, UK, 2006.
94
95  \example pitch/test-pitch.c
96  \example examples/aubiopitch.c
97
98*/
99
100/** pitch detection object */
101typedef struct _aubio_pitch_t aubio_pitch_t;
102
103/** execute pitch detection on an input signal frame
104
105  \param o pitch detection object as returned by new_aubio_pitch()
106  \param in input signal of size [hop_size]
107  \param out output pitch candidates of size [1]
108
109*/
110void aubio_pitch_do (aubio_pitch_t * o, const fvec_t * in, fvec_t * out);
111
112/** change yin or yinfft tolerance threshold
113
114  \param o pitch detection object as returned by new_aubio_pitch()
115  \param tol tolerance default is 0.15 for yin and 0.85 for yinfft
116
117*/
118uint_t aubio_pitch_set_tolerance (aubio_pitch_t * o, smpl_t tol);
119
120/** get yin or yinfft tolerance threshold
121
122  \param o pitch detection object as returned by new_aubio_pitch()
123  \return tolerance (default is 0.15 for yin and 0.85 for yinfft)
124
125*/
126smpl_t aubio_pitch_get_tolerance (aubio_pitch_t * o);
127
128/** deletion of the pitch detection object
129
130  \param o pitch detection object as returned by new_aubio_pitch()
131
132*/
133void del_aubio_pitch (aubio_pitch_t * o);
134
135/** creation of the pitch detection object
136
137  \param method set pitch detection algorithm
138  \param buf_size size of the input buffer to analyse
139  \param hop_size step size between two consecutive analysis instant
140  \param samplerate sampling rate of the signal
141
142  \return newly created ::aubio_pitch_t
143
144*/
145aubio_pitch_t *new_aubio_pitch (const char_t * method,
146    uint_t buf_size, uint_t hop_size, uint_t samplerate);
147
148/** set the output unit of the pitch detection object
149
150  \param o pitch detection object as returned by new_aubio_pitch()
151  \param mode set pitch units for output
152
153  \return 0 if successfull, non-zero otherwise
154
155*/
156uint_t aubio_pitch_set_unit (aubio_pitch_t * o, const char_t * mode);
157
158/** set the silence threshold of the pitch detection object
159
160  \param o pitch detection object as returned by new_aubio_pitch()
161  \param silence level threshold under which pitch should be ignored, in dB
162
163  \return 0 if successfull, non-zero otherwise
164
165*/
166uint_t aubio_pitch_set_silence (aubio_pitch_t * o, smpl_t silence);
167
168/** set the silence threshold of the pitch detection object
169
170  \param o pitch detection object as returned by ::new_aubio_pitch()
171
172  \return level threshold under which pitch should be ignored, in dB
173
174*/
175smpl_t aubio_pitch_get_silence (aubio_pitch_t * o);
176
177/** get the current confidence
178
179  \param o pitch detection object as returned by new_aubio_pitch()
180
181  \return the current confidence of the pitch algorithm
182
183*/
184smpl_t aubio_pitch_get_confidence (aubio_pitch_t * o);
185
186#ifdef __cplusplus
187}
188#endif
189
190#endif /* AUBIO_PITCH_H */
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