ref: ee7b9da61315625e941704bce48a035de4d63618
dir: /src/hist.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 "sample.h"
#include "scale.h"
#include "mathutils.h" //vec_min vec_max
#include "hist.h"
/********
* Object Structure
*/
struct _aubio_hist_t {
/*bug: move to a fvec */
smpl_t ** hist;
uint_t nelems;
uint_t channels;
smpl_t * cent;
aubio_scale_t *scaler;
};
/********************************************************
* Object Memory Allocation
*/
static aubio_hist_t * aubio_hist_malloc(uint_t channels, uint_t nelems);
static void aubio_hist_free(aubio_hist_t * s);
aubio_hist_t * aubio_hist_malloc(uint_t channels, uint_t nelems) {
uint_t i;
aubio_hist_t * s = AUBIO_NEW(aubio_hist_t);
s->channels = channels;
s->nelems = nelems;
s->hist = AUBIO_ARRAY(smpl_t*, channels);
for (i=0; i< s->channels; i++) {
s->hist[i] = AUBIO_ARRAY(smpl_t, nelems);
}
s->cent = AUBIO_ARRAY(smpl_t, nelems);
return s;
}
void aubio_hist_free(aubio_hist_t * s) {
AUBIO_FREE(s);
}
/***
* Object creation/deletion calls
*/
aubio_hist_t * new_aubio_hist (smpl_t ilow, smpl_t ihig, uint_t nelems, uint_t channels){
smpl_t step = (ihig-ilow)/(smpl_t)(nelems);
smpl_t accum = step;
uint_t i;
aubio_hist_t * s = aubio_hist_malloc(channels, nelems);
/* use scale to map ilow/ihig -> 0/nelems */
s->scaler = new_aubio_scale(ilow,ihig,0,nelems);
/* calculate centers now once */
s->cent[0] = ilow + 0.5 * step;
for (i=1; i < s->nelems; i++, accum+=step )
s->cent[i] = s->cent[0] + accum;
return s;
}
void del_aubio_hist(aubio_hist_t *s) {
aubio_hist_free(s);
}
/***
* do it
*/
void aubio_hist_do (aubio_hist_t *s, fvec_t *input)
{
uint_t i,j;
aubio_scale_do(s->scaler, input);
/* reset data */
for (i=0; i < s->channels; i++)
for (j=0; j < s->nelems; j++)
s->hist[i][j] = 0;
/* run accum */
for (i=0; i < input->channels; i++)
for (j=0; j < input->length; j++)
s->hist[i][(uint_t)floor(input->data[i][j])] += 1;
}
void aubio_hist_do_notnull (aubio_hist_t *s, fvec_t *input)
{
uint_t i,j;
aubio_scale_do(s->scaler, input);
/* reset data */
for (i=0; i < s->channels; i++)
for (j=0; j < s->nelems; j++)
s->hist[i][j] = 0;
/* run accum */
for (i=0; i < input->channels; i++)
for (j=0; j < input->length; j++)
if (input->data[i][j]!=0.0f) //input is not 0
s->hist[i][(uint_t)floor(input->data[i][j])] += 1;
}
void aubio_hist_dyn_notnull (aubio_hist_t *s, fvec_t *input)
{
uint_t i,j;
smpl_t ilow = vec_min(input);
smpl_t ihig = vec_max(input);
smpl_t step = (ihig-ilow)/(smpl_t)(s->nelems);
/* readapt */
aubio_scale_set(s->scaler, ilow, ihig, 0, s->nelems);
/* recalculate centers */
s->cent[0] = ilow + 0.5f * step;
for (i=1; i < s->nelems; i++)
s->cent[i] = s->cent[0] + i * step;
/* scale */
aubio_scale_do(s->scaler, input);
/* reset data */
for (i=0; i < s->channels; i++)
for (j=0; j < s->nelems; j++)
s->hist[i][j] = 0;
/* run accum */
for (i=0; i < input->channels; i++)
for (j=0; j < input->length; j++)
if (input->data[i][j]!=0.) //input was not 0
s->hist[i][(uint_t)floorf(input->data[i][j])] += 1;
}
void aubio_hist_weigth (aubio_hist_t *s)
{
uint_t i,j;
for (i=0; i < s->channels; i++)
for (j=0; j < s->nelems; j++) {
s->hist[i][j] *= s->cent[j];
}
}
smpl_t aubio_hist_mean (aubio_hist_t *s)
{
uint_t i,j;
smpl_t tmp = 0.0f;
for (i=0; i < s->channels; i++)
for (j=0; j < s->nelems; j++)
tmp += s->hist[i][j];
return tmp/(smpl_t)(s->nelems);
}