andrew@0: /*
andrew@0:    Copyright (C) 2003 Paul Brossier
andrew@0: 
andrew@0:    This program is free software; you can redistribute it and/or modify
andrew@0:    it under the terms of the GNU General Public License as published by
andrew@0:    the Free Software Foundation; either version 2 of the License, or
andrew@0:    (at your option) any later version.
andrew@0: 
andrew@0:    This program is distributed in the hope that it will be useful,
andrew@0:    but WITHOUT ANY WARRANTY; without even the implied warranty of
andrew@0:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
andrew@0:    GNU General Public License for more details.
andrew@0: 
andrew@0:    You should have received a copy of the GNU General Public License
andrew@0:    along with this program; if not, write to the Free Software
andrew@0:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
andrew@0: 
andrew@0: */
andrew@0: 
andrew@0: /** \file 
andrew@0: 
andrew@0:    Pitch detection using a Schmitt trigger 
andrew@0:  
andrew@0:    This pitch extraction method implements a Schmitt trigger to estimate the
andrew@0:    period of a signal.
andrew@0: 
andrew@0:    This file was derived from the tuneit project, written by Mario Lang to
andrew@0:    detect the fundamental frequency of a sound.
andrew@0:    
andrew@0:    see http://delysid.org/tuneit.html 
andrew@0: 
andrew@0: */
andrew@0: 
andrew@0: #ifndef _PITCHSCHMITT_H
andrew@0: #define _PITCHSCHMITT_H
andrew@0: 
andrew@0: #ifdef __cplusplus
andrew@0: extern "C" {
andrew@0: #endif
andrew@0: 
andrew@0: /** pitch detection object */
andrew@0: typedef struct _aubio_pitchschmitt_t aubio_pitchschmitt_t;
andrew@0: 
andrew@0: /** execute pitch detection on an input buffer 
andrew@0:  
andrew@0:   \param p pitch detection object as returned by new_aubio_pitchschmitt 
andrew@0:   \param input input signal window (length as specified at creation time) 
andrew@0:  
andrew@0: */
andrew@0: smpl_t aubio_pitchschmitt_detect (aubio_pitchschmitt_t *p, fvec_t * input);
andrew@0: /** creation of the pitch detection object
andrew@0:  
andrew@0:   \param size size of the input buffer to analyse 
andrew@0:   \param samplerate sampling rate of the signal 
andrew@0:  
andrew@0: */
andrew@0: aubio_pitchschmitt_t * new_aubio_pitchschmitt (ba_uint_t size, ba_uint_t samplerate);
andrew@0: /** deletion of the pitch detection object
andrew@0:  
andrew@0:   \param p pitch detection object as returned by new_aubio_pitchschmitt 
andrew@0:  
andrew@0: */
andrew@0: void del_aubio_pitchschmitt (aubio_pitchschmitt_t *p);
andrew@0: 
andrew@0: 
andrew@0: #ifdef __cplusplus
andrew@0: }
andrew@0: #endif
andrew@0: 
andrew@0: #endif /* _PITCHSCHMITT_H */
andrew@0: