/*
- Copyright (C) 2007 Amaury Hazan <ahazan@iua.upf.edu>
- and Paul Brossier <piem@piem.org>
+ Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
+ and Amaury Hazan <ahazan@iua.upf.edu>
- 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 file is part of aubio.
- 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.
+ 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.
- 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.
+ 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 "sample.h"
+#include "fvec.h"
+#include "fmat.h"
+#include "cvec.h"
+#include "vecutils.h"
#include "spectral/filterbank.h"
#include "mathutils.h"
-#define VERY_SMALL_NUMBER 2e-42
-
/** \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;
- fvec_t **filters;
+struct _aubio_filterbank_t
+{
+ uint_t win_s;
+ uint_t n_filters;
+ fmat_t *filters;
+ smpl_t norm;
+ smpl_t power;
};
-aubio_filterbank_t * new_aubio_filterbank(uint_t n_filters, uint_t win_s){
- /** allocating space for filterbank object */
- aubio_filterbank_t * fb = AUBIO_NEW(aubio_filterbank_t);
- uint_t filter_cnt;
- fb->win_s=win_s;
- fb->n_filters=n_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);
- /** allocating filter tables */
- fb->filters=AUBIO_ARRAY(fvec_t*,n_filters);
- for (filter_cnt=0; filter_cnt<n_filters; filter_cnt++)
- /* considering one-channel filters */
- fb->filters[filter_cnt]=new_fvec(win_s, 1);
+ if ((sint_t)n_filters <= 0) {
+ AUBIO_ERR("filterbank: n_filters should be > 0, got %d\n", n_filters);
+ goto fail;
+ }
+ if ((sint_t)win_s <= 0) {
+ AUBIO_ERR("filterbank: win_s should be > 0, got %d\n", win_s);
+ goto fail;
+ }
+ fb->win_s = win_s;
+ fb->n_filters = n_filters;
- return fb;
-}
+ /* allocate filter tables, a matrix of length win_s and of height n_filters */
+ fb->filters = new_fmat (n_filters, win_s / 2 + 1);
-/*
-FB initialization based on Slaney's auditory toolbox
-TODO:
- *solve memory leak problems while
- *solve quantization issues when constructing signal:
- *bug for win_s=512
- *corrections for win_s=1024 -> why even filters with smaller amplitude
+ fb->norm = 1;
-*/
+ fb->power = 1;
-aubio_filterbank_t * new_aubio_filterbank_mfcc(uint_t n_filters, uint_t win_s, uint_t samplerate, smpl_t freq_min, smpl_t freq_max){
-
- aubio_filterbank_t * fb = new_aubio_filterbank(n_filters, win_s);
-
-
- //slaney params
- smpl_t lowestFrequency = 133.3333;
- smpl_t linearSpacing = 66.66666666;
- smpl_t logSpacing = 1.0711703;
-
- uint_t linearFilters = 13;
- uint_t logFilters = 27;
- uint_t allFilters = linearFilters + logFilters;
-
- //buffers for computing filter frequencies
- fvec_t * freqs=new_fvec(allFilters+2 , 1);
-
- fvec_t * lower_freqs=new_fvec( allFilters, 1);
- fvec_t * upper_freqs=new_fvec( allFilters, 1);
- fvec_t * center_freqs=new_fvec( allFilters, 1);
-
- fvec_t * triangle_heights=new_fvec( allFilters, 1);
- //lookup table of each bin frequency in hz
- fvec_t * fft_freqs=new_fvec(win_s, 1);
-
- uint_t filter_cnt, bin_cnt;
-
- //first step: filling all the linear filter frequencies
- for(filter_cnt=0; filter_cnt<linearFilters; filter_cnt++){
- freqs->data[0][filter_cnt]=lowestFrequency+ filter_cnt*linearSpacing;
- }
- smpl_t lastlinearCF=freqs->data[0][filter_cnt-1];
-
- //second step: filling all the log filter frequencies
- for(filter_cnt=0; filter_cnt<logFilters+2; filter_cnt++){
- freqs->data[0][filter_cnt+linearFilters] =
- lastlinearCF*(pow(logSpacing,filter_cnt+1));
- }
+ return fb;
+fail:
+ AUBIO_FREE (fb);
+ return NULL;
+}
- //Option 1. copying interesting values to lower_freqs, center_freqs and upper freqs arrays
- //TODO: would be nicer to have a reference to freqs->data, anyway we do not care in this init step
-
- for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++){
- lower_freqs->data[0][filter_cnt]=freqs->data[0][filter_cnt];
- center_freqs->data[0][filter_cnt]=freqs->data[0][filter_cnt+1];
- upper_freqs->data[0][filter_cnt]=freqs->data[0][filter_cnt+2];
- }
+void
+del_aubio_filterbank (aubio_filterbank_t * fb)
+{
+ del_fmat (fb->filters);
+ AUBIO_FREE (fb);
+}
- //computing triangle heights so that each triangle has unit area
- for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++){
- triangle_heights->data[0][filter_cnt] = 2./(upper_freqs->data[0][filter_cnt]
- - lower_freqs->data[0][filter_cnt]);
- }
-
- //AUBIO_DBG("filter tables frequencies\n");
- //for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++)
- // AUBIO_DBG("filter n. %d %f %f %f %f\n",
- // filter_cnt, lower_freqs->data[0][filter_cnt],
- // center_freqs->data[0][filter_cnt], upper_freqs->data[0][filter_cnt],
- // triangle_heights->data[0][filter_cnt]);
-
- //filling the fft_freqs lookup table, which assigns the frequency in hz to each bin
- for(bin_cnt=0; bin_cnt<win_s; bin_cnt++){
- fft_freqs->data[0][bin_cnt]= aubio_bintofreq(bin_cnt, samplerate, win_s);
- }
+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);
- //building each filter table
- for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++){
-
- //TODO:check special case : lower freq =0
- //calculating rise increment in mag/Hz
- smpl_t riseInc= triangle_heights->data[0][filter_cnt]/(center_freqs->data[0][filter_cnt]-lower_freqs->data[0][filter_cnt]);
-
- //zeroing begining of filter
- for(bin_cnt=0; bin_cnt<win_s-1; bin_cnt++){
- fb->filters[filter_cnt]->data[0][bin_cnt]=0.f;
- if( fft_freqs->data[0][bin_cnt] <= lower_freqs->data[0][filter_cnt] &&
- fft_freqs->data[0][bin_cnt+1] > lower_freqs->data[0][filter_cnt]) {
- break;
- }
- }
- bin_cnt++;
-
- //positive slope
- for(; bin_cnt<win_s-1; bin_cnt++){
- fb->filters[filter_cnt]->data[0][bin_cnt]=(fft_freqs->data[0][bin_cnt]-lower_freqs->data[0][filter_cnt])*riseInc;
- //if(fft_freqs->data[0][bin_cnt]<= center_freqs->data[0][filter_cnt] && fft_freqs->data[0][bin_cnt+1]> center_freqs->data[0][filter_cnt])
- if(fft_freqs->data[0][bin_cnt+1]> center_freqs->data[0][filter_cnt])
- break;
- }
- //bin_cnt++;
-
- //negative slope
- for(; bin_cnt<win_s-1; bin_cnt++){
-
- //checking whether last value is less than 0...
- smpl_t val=triangle_heights->data[0][filter_cnt]-(fft_freqs->data[0][bin_cnt]-center_freqs->data[0][filter_cnt])*riseInc;
- if(val>=0)
- fb->filters[filter_cnt]->data[0][bin_cnt]=val;
- else fb->filters[filter_cnt]->data[0][bin_cnt]=0.f;
-
- //if(fft_freqs->data[0][bin_cnt]<= upper_freqs->data[0][bin_cnt] && fft_freqs->data[0][bin_cnt+1]> upper_freqs->data[0][filter_cnt])
- //TODO: CHECK whether bugfix correct
- if(fft_freqs->data[0][bin_cnt+1]> upper_freqs->data[0][filter_cnt])
- break;
- }
- //bin_cnt++;
-
- //zeroing tail
- for(; bin_cnt<win_s; bin_cnt++)
- fb->filters[filter_cnt]->data[0][bin_cnt]=0.f;
+ // view cvec->norm as fvec->data
+ fvec_t tmp;
+ tmp.length = in->length;
+ tmp.data = in->norm;
- }
-
-
- del_fvec(freqs);
- del_fvec(lower_freqs);
- del_fvec(upper_freqs);
- del_fvec(center_freqs);
+ if (f->power != 1.) fvec_pow(&tmp, f->power);
- del_fvec(triangle_heights);
- del_fvec(fft_freqs);
+ fmat_vecmul(f->filters, &tmp, out);
- return fb;
+ return;
+}
+fmat_t *
+aubio_filterbank_get_coeffs (const aubio_filterbank_t * f)
+{
+ return f->filters;
}
-void del_aubio_filterbank(aubio_filterbank_t * fb){
- uint_t filter_cnt;
- /** deleting filter tables first */
- for (filter_cnt=0; filter_cnt<fb->n_filters; filter_cnt++)
- del_fvec(fb->filters[filter_cnt]);
- AUBIO_FREE(fb->filters);
- AUBIO_FREE(fb);
+uint_t
+aubio_filterbank_set_coeffs (aubio_filterbank_t * f, const fmat_t * filter_coeffs)
+{
+ fmat_copy(filter_coeffs, f->filters);
+ return 0;
}
-void aubio_filterbank_do(aubio_filterbank_t * f, cvec_t * in, fvec_t *out) {
- uint_t n, filter_cnt;
- for(filter_cnt = 0; (filter_cnt < f->n_filters)
- && (filter_cnt < out->length); filter_cnt++){
- out->data[0][filter_cnt] = 0.f;
- for(n = 0; n < in->length; n++){
- out->data[0][filter_cnt] += in->norm[0][n]
- * f->filters[filter_cnt]->data[0][n];
- }
- out->data[0][filter_cnt] =
- LOG(out->data[0][filter_cnt] < VERY_SMALL_NUMBER ?
- VERY_SMALL_NUMBER : out->data[0][filter_cnt]);
- }
+uint_t
+aubio_filterbank_set_norm (aubio_filterbank_t *f, smpl_t norm)
+{
+ if (norm != 0 && norm != 1) return AUBIO_FAIL;
+ f->norm = norm;
+ return AUBIO_OK;
+}
- return;
+smpl_t
+aubio_filterbank_get_norm (aubio_filterbank_t *f)
+{
+ return f->norm;
+}
+
+uint_t
+aubio_filterbank_set_power (aubio_filterbank_t *f, smpl_t power)
+{
+ f->power = power;
+ return AUBIO_OK;
}
-fvec_t * aubio_filterbank_getchannel(aubio_filterbank_t * f, uint_t channel) {
- if ( (channel < f->n_filters) ) { return f->filters[channel]; }
- else { return NULL; }
+smpl_t
+aubio_filterbank_get_power (aubio_filterbank_t *f)
+{
+ return f->power;
}
projects / aubio.git / blobdiff