/usr/include/aubio/pitchyin.h is in libaubio-dev 0.3.2-4.2build1.
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 Paul Brossier
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** \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
*/
#ifndef PITCHYIN_H
#define PITCHYIN_H
#ifdef __cplusplus
extern "C" {
#endif
/** compute difference function
\param input input signal
\param yinbuf output buffer to store difference function (half shorter than input)
*/
void aubio_pitchyin_diff(fvec_t * input, fvec_t * yinbuf);
/** in place computation of the YIN cumulative normalised function
\param yinbuf input signal (a square difference function), also used to store function
*/
void aubio_pitchyin_getcum(fvec_t * yinbuf);
/** detect pitch in a YIN function
\param yinbuf input buffer as computed by aubio_pitchyin_getcum
*/
uint_t aubio_pitchyin_getpitch(fvec_t *yinbuf);
/** fast implementation of the YIN algorithm
\param input input signal
\param yinbuf input buffer used to compute the YIN function
\param tol tolerance parameter for minima selection [default 0.15]
*/
smpl_t aubio_pitchyin_getpitchfast(fvec_t * input, fvec_t *yinbuf, smpl_t tol);
#ifdef __cplusplus
}
#endif
#endif /*PITCHYIN_H*/
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