/usr/include/aubio/pitch/pitchyin.h is in libaubio-dev 0.4.1-2build4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2003-2013 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 the YIN algorithm
This algorithm was developped by A. de Cheveigne and H. Kawahara and
published in:
De Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
http://recherche.ircam.fr/equipes/pcm/cheveign/ps/2002_JASA_YIN_proof.pdf
\example pitch/test-pitchyin.c
*/
#ifndef _AUBIO_PITCHYIN_H
#define _AUBIO_PITCHYIN_H
#ifdef __cplusplus
extern "C" {
#endif
/** pitch detection object */
typedef struct _aubio_pitchyin_t aubio_pitchyin_t;
/** creation of the pitch detection object
\param buf_size size of the input buffer to analyse
*/
aubio_pitchyin_t *new_aubio_pitchyin (uint_t buf_size);
/** deletion of the pitch detection object
\param o pitch detection object as returned by new_aubio_pitchyin()
*/
void del_aubio_pitchyin (aubio_pitchyin_t * o);
/** execute pitch detection an input buffer
\param o pitch detection object as returned by new_aubio_pitchyin()
\param samples_in input signal vector (length as specified at creation time)
\param cands_out pitch period candidates, in samples
*/
void aubio_pitchyin_do (aubio_pitchyin_t * o, fvec_t * samples_in, fvec_t * cands_out);
/** 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_pitchyin_set_tolerance (aubio_pitchyin_t * o, smpl_t tol);
/** get tolerance parameter for YIN algorithm
\param o YIN pitch detection object
\return tolerance parameter for minima selection [default 0.15]
*/
smpl_t aubio_pitchyin_get_tolerance (aubio_pitchyin_t * o);
/** get current confidence of YIN algorithm
\param o YIN pitch detection object
\return confidence parameter
*/
smpl_t aubio_pitchyin_get_confidence (aubio_pitchyin_t * o);
#ifdef __cplusplus
}
#endif
#endif /* _AUBIO_PITCHYIN_H */
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