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/*
Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
and Amaury Hazan <ahazan@iua.upf.edu>
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 "fmat.h"
#include "cvec.h"
#include "spectral/filterbank.h"
#include "mathutils.h"
/** \brief A structure to store a set of n_filters filters of lenghts win_s */
struct _aubio_filterbank_t
{
uint_t win_s;
uint_t n_filters;
fmat_t *filters;
};
aubio_filterbank_t *
new_aubio_filterbank (uint_t n_filters, uint_t win_s)
{
/* allocate space for filterbank object */
aubio_filterbank_t *fb = AUBIO_NEW (aubio_filterbank_t);
fb->win_s = win_s;
fb->n_filters = n_filters;
/* allocate filter tables, a matrix of length win_s and of height n_filters */
fb->filters = new_fmat (n_filters, win_s / 2 + 1);
return fb;
}
void
del_aubio_filterbank (aubio_filterbank_t * fb)
{
del_fmat (fb->filters);
AUBIO_FREE (fb);
}
void
aubio_filterbank_do (aubio_filterbank_t * f, const cvec_t * in, fvec_t * out)
{
/* apply filter to all input channel, provided out has enough channels */
//uint_t max_filters = MIN (f->n_filters, out->length);
//uint_t max_length = MIN (in->length, f->filters->length);
// view cvec->norm as fvec->data
fvec_t tmp;
tmp.length = in->length;
tmp.data = in->norm;
fmat_vecmul(f->filters, &tmp, out);
return;
}
fmat_t *
aubio_filterbank_get_coeffs (const aubio_filterbank_t * f)
{
return f->filters;
}
uint_t
aubio_filterbank_set_coeffs (aubio_filterbank_t * f, const fmat_t * filter_coeffs)
{
fmat_copy(filter_coeffs, f->filters);
return 0;
}
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