ref: c37aee16ffa47fd5f7eca78ab11965b4353045f5
dir: /src/utils/scale.h/
/*
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
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
*/
uint_t aubio_scale_set_limits (aubio_scale_t *s, smpl_t ilow, smpl_t ihig,
smpl_t olow, smpl_t ohig);
#ifdef __cplusplus
}
#endif
#endif