99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
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Copyright (C) 2003-2015 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 a spectral implementation of the YIN algorithm
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This algorithm was derived from the YIN algorithm. In this implementation, a
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Fourier transform is used to compute a tapered square difference function,
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which allows spectral weighting. Because the difference function is tapered,
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the selection of the period is simplified.
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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, PhD thesis,
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Centre for Digital music, Queen Mary University of London, London, UK, 2006.
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\example pitch/test-pitchyinfft.c
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*/
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#ifndef AUBIO_PITCHYINFFT_H
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#define AUBIO_PITCHYINFFT_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_pitchyinfft_t aubio_pitchyinfft_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_pitchyinfft
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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_pitchyinfft_do (aubio_pitchyinfft_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 samplerate samplerate of the input signal
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\param buf_size size of the input buffer to analyse
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*/
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aubio_pitchyinfft_t *new_aubio_pitchyinfft (uint_t samplerate, 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_pitchyinfft()
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*/
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void del_aubio_pitchyinfft (aubio_pitchyinfft_t * o);
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/** get tolerance parameter for YIN algorithm
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\param o YIN pitch detection object
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\return tolerance parameter for minima selection [default 0.15]
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*/
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smpl_t aubio_pitchyinfft_get_tolerance (aubio_pitchyinfft_t * o);
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/** set tolerance parameter for YIN algorithm
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\param o YIN pitch detection object
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\param tol tolerance parameter for minima selection [default 0.15]
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*/
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uint_t aubio_pitchyinfft_set_tolerance (aubio_pitchyinfft_t * o, smpl_t tol);
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/** get current confidence of YIN algorithm
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\param o YIN pitch detection object
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\return confidence parameter
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*/
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smpl_t aubio_pitchyinfft_get_confidence (aubio_pitchyinfft_t * o);
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#ifdef __cplusplus
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}
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#endif
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#endif /* AUBIO_PITCHYINFFT_H */
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