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/*
Copyright (C) 2003-2015 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
aubio is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with aubio. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
Pitch detection using a spectral implementation of the YIN algorithm
This algorithm was derived from the YIN algorithm. In this implementation, a
Fourier transform is used to compute a tapered square difference function,
which allows spectral weighting. Because the difference function is tapered,
the selection of the period is simplified.
Paul Brossier, [Automatic annotation of musical audio for interactive
systems](http://aubio.org/phd/), Chapter 3, Pitch Analysis, PhD thesis,
Centre for Digital music, Queen Mary University of London, London, UK, 2006.
\example pitch/test-pitchyinfft.c
*/
#ifndef AUBIO_PITCHYINFFT_H
#define AUBIO_PITCHYINFFT_H
#ifdef __cplusplus
extern "C" {
#endif
/** pitch detection object */
typedef struct _aubio_pitchyinfft_t aubio_pitchyinfft_t;
/** execute pitch detection on an input buffer
\param o pitch detection object as returned by new_aubio_pitchyinfft
\param samples_in input signal vector (length as specified at creation time)
\param cands_out pitch period candidates, in samples
*/
void aubio_pitchyinfft_do (aubio_pitchyinfft_t * o, const fvec_t * samples_in, fvec_t * cands_out);
/** creation of the pitch detection object
\param samplerate samplerate of the input signal
\param buf_size size of the input buffer to analyse
*/
aubio_pitchyinfft_t *new_aubio_pitchyinfft (uint_t samplerate, uint_t buf_size);
/** deletion of the pitch detection object
\param o pitch detection object as returned by new_aubio_pitchyinfft()
*/
void del_aubio_pitchyinfft (aubio_pitchyinfft_t * o);
/** get tolerance parameter for YIN algorithm
\param o YIN pitch detection object
\return tolerance parameter for minima selection [default 0.15]
*/
smpl_t aubio_pitchyinfft_get_tolerance (aubio_pitchyinfft_t * o);
/** set tolerance parameter for YIN algorithm
\param o YIN pitch detection object
\param tol tolerance parameter for minima selection [default 0.15]
*/
uint_t aubio_pitchyinfft_set_tolerance (aubio_pitchyinfft_t * o, smpl_t tol);
/** get current confidence of YIN algorithm
\param o YIN pitch detection object
\return confidence parameter
*/
smpl_t aubio_pitchyinfft_get_confidence (aubio_pitchyinfft_t * o);
#ifdef __cplusplus
}
#endif
#endif /* AUBIO_PITCHYINFFT_H */
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