/*
   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

/** pitch detection object */
typedef struct _aubio_pitchyin_t aubio_pitchyin_t;

/** creation of the pitch detection object
 
  \param bufsize size of the input buffer to analyse 
 
*/
aubio_pitchyin_t * new_aubio_pitchyin (uint_t bufsize);

/** deletion of the pitch detection object
 
  \param p pitch detection object as returned by new_aubio_pitchyin()
 
*/
void del_aubio_pitchyin (aubio_pitchyin_t * o);

/** execute pitch detection on an input buffer 
 
  \param p pitch detection object as returned by new_aubio_pitchyin()
  \param input input signal window (length as specified at creation time) 
  \param tol tolerance parameter for minima selection [default 0.85] 
 
*/
void aubio_pitchyin_do (aubio_pitchyin_t * o, fvec_t * in, fvec_t * 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);

#ifdef __cplusplus
}
#endif

#endif /*PITCHYIN_H*/