/*
- Copyright (C) 2003 Paul Brossier
+ Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>
- 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 "lvec.h"
#include "mathutils.h"
#include "temporal/filter.h"
-#include "temporal/filter_priv.h"
-void aubio_filter_do(aubio_filter_t * f, fvec_t * in) {
- aubio_filter_do_outplace(f, in, in);
+struct _aubio_filter_t
+{
+ uint_t order;
+ uint_t samplerate;
+ lvec_t *a;
+ lvec_t *b;
+ lvec_t *y;
+ lvec_t *x;
+};
+
+void
+aubio_filter_do_outplace (aubio_filter_t * f, fvec_t * in, fvec_t * out)
+{
+ fvec_copy (in, out);
+ aubio_filter_do (f, out);
}
-void aubio_filter_do_outplace(aubio_filter_t * f, fvec_t * in, fvec_t * out) {
- uint_t i,j,l, order = f->order;
- lsmp_t *x;
- lsmp_t *y;
- lsmp_t *a = f->a->data[0];
- lsmp_t *b = f->b->data[0];
-
- for (i = 0; i < in->channels; i++) {
- x = f->x->data[i];
- y = f->y->data[i];
- for (j = 0; j < in->length; j++) {
- /* new input */
- if (ISDENORMAL(in->data[i][j])) {
- x[0] = y[0] = 0.;
- } else {
- x[0] = in->data[i][j];
- y[0] = b[0] * x[0];
- for (l=1;l<order; l++) {
- y[0] += b[l] * x[l];
- y[0] -= a[l] * y[l];
- }
- }
- /* new output */
- out->data[i][j] = y[0];
- /* store for next sample */
- for (l=order-1; l>0; l--){
- x[l] = x[l-1];
- y[l] = y[l-1];
- }
+void
+aubio_filter_do (aubio_filter_t * f, fvec_t * in)
+{
+ uint_t j, l, order = f->order;
+ lsmp_t *x = f->x->data;
+ lsmp_t *y = f->y->data;
+ lsmp_t *a = f->a->data;
+ lsmp_t *b = f->b->data;
+
+ for (j = 0; j < in->length; j++) {
+ /* new input */
+ x[0] = KILL_DENORMAL (in->data[j]);
+ y[0] = b[0] * x[0];
+ for (l = 1; l < order; l++) {
+ y[0] += b[l] * x[l];
+ y[0] -= a[l] * y[l];
+ }
+ /* new output */
+ in->data[j] = y[0];
+ /* store for next sample */
+ for (l = order - 1; l > 0; l--) {
+ x[l] = x[l - 1];
+ y[l] = y[l - 1];
}
- /* store for next run */
- f->x->data[i] = x;
- f->y->data[i] = y;
}
}
-/*
- *
- * despite mirroring, end effects destroy both phse and amplitude. the longer
- * the buffer, the less affected they are.
- *
- * replacing with zeros clicks.
- *
- * seems broken for order > 4 (see biquad_do_filtfilt for audible one)
- */
-void aubio_filter_do_filtfilt(aubio_filter_t * f, fvec_t * in, fvec_t * tmp) {
- uint_t j,i=0;
+/* The rough way: reset memory of filter between each run to avoid end effects. */
+void
+aubio_filter_do_filtfilt (aubio_filter_t * f, fvec_t * in, fvec_t * tmp)
+{
+ uint_t j;
uint_t length = in->length;
- //uint_t order = f->order;
- //lsmp_t mir;
- /* mirroring */
- //mir = 2*in->data[i][0];
- //for (j=1;j<order;j++)
- //f->x[j] = 0.;//mir - in->data[i][order-j];
/* apply filtering */
- aubio_filter_do(f,in);
- /* invert */
+ aubio_filter_do (f, in);
+ aubio_filter_do_reset (f);
+ /* mirror */
for (j = 0; j < length; j++)
- tmp->data[i][length-j-1] = in->data[i][j];
- /* mirror inverted */
- //mir = 2*tmp->data[i][0];
- //for (j=1;j<order;j++)
- //f->x[j] = 0.;//mir - tmp->data[i][order-j];
- /* apply filtering on inverted */
- aubio_filter_do(f,tmp);
+ tmp->data[length - j - 1] = in->data[j];
+ /* apply filtering on mirrored */
+ aubio_filter_do (f, tmp);
+ aubio_filter_do_reset (f);
/* invert back */
for (j = 0; j < length; j++)
- in->data[i][j] = tmp->data[i][length-j-1];
+ in->data[j] = tmp->data[length - j - 1];
+}
+
+lvec_t *
+aubio_filter_get_feedback (aubio_filter_t * f)
+{
+ return f->a;
+}
+
+lvec_t *
+aubio_filter_get_feedforward (aubio_filter_t * f)
+{
+ return f->b;
+}
+
+uint_t
+aubio_filter_get_order (aubio_filter_t * f)
+{
+ return f->order;
+}
+
+uint_t
+aubio_filter_get_samplerate (aubio_filter_t * f)
+{
+ return f->samplerate;
+}
+
+uint_t
+aubio_filter_set_samplerate (aubio_filter_t * f, uint_t samplerate)
+{
+ f->samplerate = samplerate;
+ return AUBIO_OK;
+}
+
+void
+aubio_filter_do_reset (aubio_filter_t * f)
+{
+ lvec_zeros (f->x);
+ lvec_zeros (f->y);
}
-aubio_filter_t * new_aubio_filter(uint_t samplerate UNUSED, uint_t order, uint_t channels) {
- aubio_filter_t * f = AUBIO_NEW(aubio_filter_t);
- f->x = new_lvec(order, channels);
- f->y = new_lvec(order, channels);
- f->a = new_lvec(order, 1);
- f->b = new_lvec(order, 1);
- f->a->data[0][1] = 1.;
+aubio_filter_t *
+new_aubio_filter (uint_t order)
+{
+ aubio_filter_t *f = AUBIO_NEW (aubio_filter_t);
+ f->x = new_lvec (order);
+ f->y = new_lvec (order);
+ f->a = new_lvec (order);
+ f->b = new_lvec (order);
+ /* by default, samplerate is not set */
+ f->samplerate = 0;
f->order = order;
+ /* set default to identity */
+ f->a->data[1] = 1.;
return f;
}
-void del_aubio_filter(aubio_filter_t * f) {
- AUBIO_FREE(f->a);
- AUBIO_FREE(f->b);
- AUBIO_FREE(f->x);
- AUBIO_FREE(f->y);
- AUBIO_FREE(f);
+void
+del_aubio_filter (aubio_filter_t * f)
+{
+ del_lvec (f->a);
+ del_lvec (f->b);
+ del_lvec (f->x);
+ del_lvec (f->y);
+ AUBIO_FREE (f);
return;
}
projects / aubio.git / blobdiff