source: src/utils/scale.h @ 01b8fcc

/*
   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

 Vector scaling function 
 
 This object, inspired from the scale object in FTS, the jMax engine, scales
 the values of a vector according to an affine function defined as follow:
 
 \f$ y = (x - ilow)*(ohig-olow)/(ihig-ilow) + olow \f$ 
 
*/
#ifndef SCALE_H
#define SCALE_H

#ifdef __cplusplus
extern "C" {
#endif

/** scale object */
typedef struct _aubio_scale_t aubio_scale_t;

/** create a scale object
 
  \param flow lower value of output function
  \param fhig higher value of output function
  \param ilow lower value of input function
  \param ihig higher value of output function

*/
aubio_scale_t * new_aubio_scale(smpl_t flow, smpl_t fhig,
    smpl_t ilow, smpl_t ihig);
/** delete a scale object 

  \param s scale object as returned by new_aubio_scale

*/
void del_aubio_scale(aubio_scale_t *s);
/** scale input vector

  \param s scale object as returned by new_aubio_scale
  \param input vector to scale

*/
void aubio_scale_do(aubio_scale_t *s, fvec_t * input);
/** modify scale parameters after object creation

  \param s scale object as returned by new_aubio_scale
  \param olow lower value of output function
  \param ohig higher value of output function
  \param ilow lower value of input function
  \param ihig higher value of output function

*/
void aubio_scale_set (aubio_scale_t *s, smpl_t ilow, smpl_t ihig,
    smpl_t olow, smpl_t ohig);

#ifdef __cplusplus
}
#endif 

#endif