ref: 55ed67a6dbdddc1a12912db6aac3534be698e25f
dir: /src/utils/scale.c/
/* 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. */ #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 (s, ilow, ihig, olow, ohig); return s; } void del_aubio_scale(aubio_scale_t *s) { AUBIO_FREE(s); } void aubio_scale_set (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 = 0.0f; } else { s->scaler = outputrange/inputrange; if (inputrange < 0) { inputrange = inputrange * -1.0f; } } } void aubio_scale_do (aubio_scale_t *s, fvec_t *input) { uint_t i, j; for (i=0; i < input->channels; i++){ for (j=0; j < input->length; j++){ input->data[i][j] -= s->ilow; input->data[i][j] *= s->scaler; input->data[i][j] += s->olow; } } }