view libs/aubioFullOSXUni/include/aubio/pitchyin.h @ 1:ba2a17cf81bf

first working version of audio file loder. Loads bach clip from the apps->audio-file-loader->bin->data->sounds foler. Three classes: SoundFileLoader does the loading and parsing of thefile with libSndFile. audio samples are kept in AudioFile and analysis of features are kept in AudioAnalysis, at this stage just chromagramm and basic energy

/*
   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

*/
ba_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*/