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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/>.
*/
/* default values : alpha=4, beta=3, threshold=0.25 */
#include "aubio_priv.h"
#include "fvec.h"
#include "cvec.h"
#include "mathutils.h"
#include "spectral/tss.h"
struct _aubio_tss_t
{
smpl_t threshold;
smpl_t alpha;
smpl_t beta;
smpl_t parm;
smpl_t thrsfact;
fvec_t *theta1;
fvec_t *theta2;
fvec_t *oft1;
fvec_t *oft2;
fvec_t *dev;
};
void aubio_tss_do(aubio_tss_t *o, const cvec_t * input,
cvec_t * trans, cvec_t * stead)
{
uint_t j;
uint_t test;
uint_t nbins = input->length;
smpl_t alpha = o->alpha;
smpl_t beta = o->beta;
smpl_t parm = o->parm;
smpl_t * dev = (smpl_t *)o->dev->data;
smpl_t * oft1 = (smpl_t *)o->oft1->data;
smpl_t * oft2 = (smpl_t *)o->oft2->data;
smpl_t * theta1 = (smpl_t *)o->theta1->data;
smpl_t * theta2 = (smpl_t *)o->theta2->data;
/* second phase derivative */
for (j=0;j<nbins; j++){
dev[j] = aubio_unwrap2pi(input->phas[j]
-2.0*theta1[j]+theta2[j]);
theta2[j] = theta1[j];
theta1[j] = input->phas[j];
/* transient analysis */
test = (ABS(dev[j]) > parm*oft1[j]);
trans->norm[j] = input->norm[j] * test;
trans->phas[j] = input->phas[j] * test;
/* steady state analysis */
test = (ABS(dev[j]) < parm*oft2[j]);
stead->norm[j] = input->norm[j] * test;
stead->phas[j] = input->phas[j] * test;
/*increase probability for transient */
test = (trans->norm[j]==0.);
oft1[j] = test;
test = (trans->norm[j]>0.);
oft1[j] += alpha*test;
test = (oft1[j]>1. && trans->norm[j]>0.);
oft1[j] += beta*test;
/*increase probability for steady states */
test = (stead->norm[j]==0.);
oft2[j] = test;
test = (stead->norm[j]>0.);
oft2[j] += alpha*test;
test = (oft2[j]>1. && stead->norm[j]>0.);
oft2[j] += beta*test;
}
}
uint_t aubio_tss_set_threshold(aubio_tss_t *o, smpl_t threshold){
o->threshold = threshold;
o->parm = o->threshold * o->thrsfact;
return AUBIO_OK;
}
aubio_tss_t * new_aubio_tss(uint_t buf_size, uint_t hop_size)
{
aubio_tss_t * o = AUBIO_NEW(aubio_tss_t);
uint_t rsize = buf_size/2+1;
o->threshold = 0.25;
o->thrsfact = TWO_PI*hop_size/rsize;
o->alpha = 3.;
o->beta = 4.;
o->parm = o->threshold*o->thrsfact;
o->theta1 = new_fvec(rsize);
o->theta2 = new_fvec(rsize);
o->oft1 = new_fvec(rsize);
o->oft2 = new_fvec(rsize);
o->dev = new_fvec(rsize);
return o;
}
void del_aubio_tss(aubio_tss_t *s)
{
del_fvec(s->theta1);
del_fvec(s->theta2);
del_fvec(s->oft1);
del_fvec(s->oft2);
del_fvec(s->dev);
AUBIO_FREE(s);
}
uint_t aubio_tss_set_alpha(aubio_tss_t *o, smpl_t alpha){
o->alpha = alpha;
return AUBIO_OK;
}
uint_t aubio_tss_set_beta(aubio_tss_t *o, smpl_t beta){
o->beta = beta;
return AUBIO_OK;
}
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