view aubioFullOSXUni/include/aubio/pitchschmitt.h @ 0:572c856e38ac

Starting up openFrameworks project for audio time warping. The ofxFileReader goes in addons of your OF folder, the libraries and source (chromogram, fftw and source code src+ timewarp) are probably best kept in the repository, then dragged into the project afresh. That way, as we update the repository, the code that the openFrameworks project looks for will be updated.

/*
   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 a Schmitt trigger 
 
   This pitch extraction method implements a Schmitt trigger to estimate the
   period of a signal.

   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 _PITCHSCHMITT_H
#define _PITCHSCHMITT_H

#ifdef __cplusplus
extern "C" {
#endif

/** pitch detection object */
typedef struct _aubio_pitchschmitt_t aubio_pitchschmitt_t;

/** execute pitch detection on an input buffer 
 
  \param p pitch detection object as returned by new_aubio_pitchschmitt 
  \param input input signal window (length as specified at creation time) 
 
*/
smpl_t aubio_pitchschmitt_detect (aubio_pitchschmitt_t *p, fvec_t * input);
/** creation of the pitch detection object
 
  \param size size of the input buffer to analyse 
  \param samplerate sampling rate of the signal 
 
*/
aubio_pitchschmitt_t * new_aubio_pitchschmitt (ba_uint_t size, ba_uint_t samplerate);
/** deletion of the pitch detection object
 
  \param p pitch detection object as returned by new_aubio_pitchschmitt 
 
*/
void del_aubio_pitchschmitt (aubio_pitchschmitt_t *p);


#ifdef __cplusplus
}
#endif

#endif /* _PITCHSCHMITT_H */