103 lines
3 KiB
C
103 lines
3 KiB
C
/*
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Copyright (C) 2013 Paul Brossier <piem@aubio.org>
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This file is part of aubio.
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aubio is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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aubio is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with aubio. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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Pitch detection using spectral auto correlation
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This algorithm implements pitch detection by computing the autocorrelation
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function as the cosine transform of the square spectral magnitudes.
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Anssi Klapuri. Qualitative and quantitative aspects in the design of
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periodicity esti- mation algorithms. In Proceedings of the European Signal
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Processing Conference (EUSIPCO), 2000.
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Paul Brossier, [Automatic annotation of musical audio for interactive
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systems](http://aubio.org/phd/), Chapter 3, Pitch Analysis, Autocorrelation,
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pp. 75-77, PhD thesis, Centre for Digital music, Queen Mary University of
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London, London, UK, 2006.
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\example pitch/test-pitchspecacf.c
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*/
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#ifndef AUBIO_PITCHSPECACF_H
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#define AUBIO_PITCHSPECACF_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** pitch detection object */
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typedef struct _aubio_pitchspecacf_t aubio_pitchspecacf_t;
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/** execute pitch detection on an input buffer
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\param o pitch detection object as returned by new_aubio_pitchspecacf
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\param samples_in input signal vector (length as specified at creation time)
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\param cands_out pitch period candidates, in samples
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*/
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void aubio_pitchspecacf_do (aubio_pitchspecacf_t * o, const fvec_t * samples_in, fvec_t * cands_out);
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/** creation of the pitch detection object
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\param buf_size size of the input buffer to analyse
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*/
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aubio_pitchspecacf_t *new_aubio_pitchspecacf (uint_t buf_size);
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/** deletion of the pitch detection object
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\param o pitch detection object as returned by new_aubio_pitchspecacf()
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*/
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void del_aubio_pitchspecacf (aubio_pitchspecacf_t * o);
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/** get tolerance parameter for `specacf` pitch detection object
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\param o pitch detection object
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\return tolerance parameter for minima selection [default 1.]
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*/
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smpl_t aubio_pitchspecacf_get_tolerance (const aubio_pitchspecacf_t * o);
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/** set tolerance parameter for `specacf` pitch detection object
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\param o pitch detection object
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\param tol tolerance parameter for minima selection [default 1.]
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\return `1` on error, `0` on success
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*/
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uint_t aubio_pitchspecacf_set_tolerance (aubio_pitchspecacf_t * o, smpl_t tol);
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/** get currenct confidence for `specacf` pitch detection object
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\param o pitch detection object
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\return confidence parameter
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*/
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smpl_t aubio_pitchspecacf_get_confidence (const aubio_pitchspecacf_t * o);
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#ifdef __cplusplus
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}
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#endif
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#endif /* AUBIO_PITCHSPECACF_H */
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