source: src/pitch/pitchfcomb.h @ bafe71d

/*
  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 fast harmonic comb filter

   This pitch extraction method implements a fast harmonic comb filter to
   determine the fundamental frequency of a harmonic sound.

   This file was derived from the tuneit project, written by Mario Lang to
   detect the fundamental frequency of a sound.
   
   see http://delysid.org/tuneit.html 

*/

#ifndef _PITCHFCOMB_H
#define _PITCHFCOMB_H

#ifdef __cplusplus
extern "C" {
#endif

/** pitch detection object */
typedef struct _aubio_pitchfcomb_t aubio_pitchfcomb_t;

/** execute pitch detection on an input buffer 
 
  \param p pitch detection object as returned by new_aubio_pitchfcomb
  \param input input signal window (length as specified at creation time) 
  \param output pitch candidates in bins
 
*/
void aubio_pitchfcomb_do (aubio_pitchfcomb_t * p, fvec_t * input,
    fvec_t * output);

/** creation of the pitch detection object
 
  \param bufsize size of the input buffer to analyse 
  \param hopsize step size between two consecutive analysis instant 
  \param channels number of channels to detect pitch on
 
*/
aubio_pitchfcomb_t *new_aubio_pitchfcomb (uint_t bufsize, uint_t hopsize,
    uint_t channels);

/** deletion of the pitch detection object
 
  \param p pitch detection object as returned by new_aubio_pitchfcomb
 
*/
void del_aubio_pitchfcomb (aubio_pitchfcomb_t * p);

#ifdef __cplusplus
}
#endif

#endif /* _PITCHFCOMB_H */