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/*
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/>.
*/
#include "aubio_priv.h"
#include "fvec.h"
#include "utils/scale.h"
struct _aubio_scale_t {
smpl_t ilow;
smpl_t ihig;
smpl_t olow;
smpl_t ohig;
smpl_t scaler;
smpl_t irange;
/* not implemented yet : type in/out data
bool inint;
bool outint;
*/
};
aubio_scale_t * new_aubio_scale (smpl_t ilow, smpl_t ihig,
smpl_t olow, smpl_t ohig) {
aubio_scale_t * s = AUBIO_NEW(aubio_scale_t);
aubio_scale_set_limits (s, ilow, ihig, olow, ohig);
return s;
}
void del_aubio_scale(aubio_scale_t *s) {
AUBIO_FREE(s);
}
uint_t aubio_scale_set_limits (aubio_scale_t *s, smpl_t ilow, smpl_t ihig,
smpl_t olow, smpl_t ohig) {
smpl_t inputrange = ihig - ilow;
smpl_t outputrange= ohig - olow;
s->ilow = ilow;
s->ihig = ihig;
s->olow = olow;
s->ohig = ohig;
if (inputrange == 0) {
s->scaler = 0.0;
} else {
s->scaler = outputrange/inputrange;
if (inputrange < 0) {
inputrange = inputrange * -1.0f;
}
}
return AUBIO_OK;
}
void aubio_scale_do (aubio_scale_t *s, fvec_t *input)
{
uint_t j;
for (j=0; j < input->length; j++){
input->data[j] -= s->ilow;
input->data[j] *= s->scaler;
input->data[j] += s->olow;
}
}
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