Mercurial > hg > audiostuff
diff spandsp-0.0.3/spandsp-0.0.3/src/complex_filters.c @ 5:f762bf195c4b
import spandsp-0.0.3
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 16:00:21 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/spandsp-0.0.3/spandsp-0.0.3/src/complex_filters.c Fri Jun 25 16:00:21 2010 +0200 @@ -0,0 +1,93 @@ +/* + * SpanDSP - a series of DSP components for telephony + * + * complex_filters.c + * + * Written by Steve Underwood <steveu@coppice.org> + * + * Copyright (C) 2003 Steve Underwood + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + * 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. + * + * $Id: complex_filters.c,v 1.8 2006/10/24 13:45:25 steveu Exp $ + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <inttypes.h> + +#include "spandsp/complex.h" +#include "spandsp/complex_filters.h" + +filter_t *filter_create(fspec_t *fs) +{ + int i; + filter_t *fi; + + fi = (filter_t *) malloc(sizeof (filter_t) + sizeof (float)*(fs->np + 1)); + if (fi) + { + fi->fs = fs; + fi->sum = 0.0; + fi->ptr = 0; /* mvg avg filters only */ + for (i = 0; i <= fi->fs->np; i++) + fi->v[i] = 0.0; + } + return fi; +} + +void filter_delete(filter_t *fi) +{ + if (fi) + free(fi); +} + +float filter_step(filter_t *fi, float x) +{ + return fi->fs->fsf(fi, x); +} + +cfilter_t *cfilter_create(fspec_t *fs) +{ + cfilter_t *cfi; + + cfi = (cfilter_t *) malloc(sizeof (cfilter_t)); + cfi->ref = filter_create(fs); + cfi->imf = filter_create(fs); + return cfi; +} + +void cfilter_delete(cfilter_t *cfi) +{ + if (cfi) + { + filter_delete(cfi->ref); + filter_delete(cfi->imf); + } +} + +complexf_t cfilter_step(cfilter_t *cfi, const complexf_t *z) +{ + complexf_t cc; + + cc.re = filter_step(cfi->ref, z->re); + cc.im = filter_step(cfi->imf, z->im); + return cc; +}