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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"
#include "mathutils.h" //fvec_min fvec_max
#include "utils/hist.h"
/********
* Object Structure
*/
struct _aubio_hist_t {
fvec_t * hist;
uint_t nelems;
fvec_t * cent;
aubio_scale_t *scaler;
};
/**
* Object creation/deletion calls
*/
aubio_hist_t * new_aubio_hist (smpl_t flow, smpl_t fhig, uint_t nelems){
aubio_hist_t * s = AUBIO_NEW(aubio_hist_t);
smpl_t step = (fhig-flow)/(smpl_t)(nelems);
smpl_t accum = step;
uint_t i;
s->nelems = nelems;
s->hist = new_fvec(nelems);
s->cent = new_fvec(nelems);
/* use scale to map flow/fhig -> 0/nelems */
s->scaler = new_aubio_scale(flow,fhig,0,nelems);
/* calculate centers now once */
s->cent->data[0] = flow + 0.5 * step;
for (i=1; i < s->nelems; i++, accum+=step )
s->cent->data[i] = s->cent->data[0] + accum;
return s;
}
void del_aubio_hist(aubio_hist_t *s) {
del_fvec(s->hist);
del_fvec(s->cent);
del_aubio_scale(s->scaler);
AUBIO_FREE(s);
}
/***
* do it
*/
void aubio_hist_do (aubio_hist_t *s, fvec_t *input) {
uint_t j;
sint_t tmp = 0;
aubio_scale_do(s->scaler, input);
/* reset data */
fvec_zeros(s->hist);
/* run accum */
for (j=0; j < input->length; j++)
{
tmp = (sint_t)FLOOR(input->data[j]);
if ((tmp >= 0) && (tmp < (sint_t)s->nelems)) {
s->hist->data[tmp] += 1;
}
}
}
void aubio_hist_do_notnull (aubio_hist_t *s, fvec_t *input) {
uint_t j;
sint_t tmp = 0;
aubio_scale_do(s->scaler, input);
/* reset data */
fvec_zeros(s->hist);
/* run accum */
for (j=0; j < input->length; j++) {
if (input->data[j] != 0) {
tmp = (sint_t)FLOOR(input->data[j]);
if ((tmp >= 0) && (tmp < (sint_t)s->nelems))
s->hist->data[tmp] += 1;
}
}
}
void aubio_hist_dyn_notnull (aubio_hist_t *s, fvec_t *input) {
uint_t i;
sint_t tmp = 0;
smpl_t ilow = fvec_min(input);
smpl_t ihig = fvec_max(input);
smpl_t step = (ihig-ilow)/(smpl_t)(s->nelems);
/* readapt */
aubio_scale_set_limits (s->scaler, ilow, ihig, 0, s->nelems);
/* recalculate centers */
s->cent->data[0] = ilow + 0.5f * step;
for (i=1; i < s->nelems; i++)
s->cent->data[i] = s->cent->data[0] + i * step;
/* scale */
aubio_scale_do(s->scaler, input);
/* reset data */
fvec_zeros(s->hist);
/* run accum */
for (i=0; i < input->length; i++) {
if (input->data[i] != 0) {
tmp = (sint_t)FLOOR(input->data[i]);
if ((tmp >= 0) && (tmp < (sint_t)s->nelems))
s->hist->data[tmp] += 1;
}
}
}
void aubio_hist_weight (aubio_hist_t *s) {
uint_t j;
for (j=0; j < s->nelems; j++) {
s->hist->data[j] *= s->cent->data[j];
}
}
smpl_t aubio_hist_mean (const aubio_hist_t *s) {
uint_t j;
smpl_t tmp = 0.0;
for (j=0; j < s->nelems; j++)
tmp += s->hist->data[j];
return tmp/(smpl_t)(s->nelems);
}
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