ref: 81fe32734168e80d53cd575535a63ce99b1eb6a0
dir: /src/pitch/pitchyinfft.h/
/*
Copyright (C) 2003-2009 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 (see pitchyin.c). 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'', Chapter 3, Pitch Analysis, PhD thesis, Centre for Digital music,
Queen Mary University of London, London, UK, 2006.
*/
#ifndef PITCHYINFFT_H
#define 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 p pitch detection object as returned by new_aubio_pitchyinfft
\param input input signal window (length as specified at creation time)
\param output pitch period candidates, in samples
*/
void aubio_pitchyinfft_do (aubio_pitchyinfft_t * p, fvec_t * in, fvec_t * out);
/** creation of the pitch detection object
\param buf_size size of the input buffer to analyse
*/
aubio_pitchyinfft_t *new_aubio_pitchyinfft (uint_t buf_size);
/** deletion of the pitch detection object
\param p pitch detection object as returned by new_aubio_pitchyinfft()
*/
void del_aubio_pitchyinfft (aubio_pitchyinfft_t * p);
/** 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 * p);
/** 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 * p, smpl_t tol);
#ifdef __cplusplus
}
#endif
#endif /*PITCHYINFFT_H*/