Mercurial > hg > audiostuff
comparison 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> |
|---|---|
| date | Fri, 25 Jun 2010 16:00:21 +0200 |
| parents | |
| children |
comparison
equal
deleted
inserted
replaced
| 4:26cd8f1ef0b1 | 5:f762bf195c4b |
|---|---|
| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * complex_filters.c | |
| 5 * | |
| 6 * Written by Steve Underwood <steveu@coppice.org> | |
| 7 * | |
| 8 * Copyright (C) 2003 Steve Underwood | |
| 9 * | |
| 10 * All rights reserved. | |
| 11 * | |
| 12 * This program is free software; you can redistribute it and/or modify | |
| 13 * it under the terms of the GNU General Public License version 2, as | |
| 14 * published by the Free Software Foundation. | |
| 15 * | |
| 16 * This program is distributed in the hope that it will be useful, | |
| 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 * GNU General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU General Public License | |
| 22 * along with this program; if not, write to the Free Software | |
| 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 24 * | |
| 25 * $Id: complex_filters.c,v 1.8 2006/10/24 13:45:25 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include <config.h> | |
| 30 #endif | |
| 31 | |
| 32 #include <stdlib.h> | |
| 33 #include <stdio.h> | |
| 34 #include <inttypes.h> | |
| 35 | |
| 36 #include "spandsp/complex.h" | |
| 37 #include "spandsp/complex_filters.h" | |
| 38 | |
| 39 filter_t *filter_create(fspec_t *fs) | |
| 40 { | |
| 41 int i; | |
| 42 filter_t *fi; | |
| 43 | |
| 44 fi = (filter_t *) malloc(sizeof (filter_t) + sizeof (float)*(fs->np + 1)); | |
| 45 if (fi) | |
| 46 { | |
| 47 fi->fs = fs; | |
| 48 fi->sum = 0.0; | |
| 49 fi->ptr = 0; /* mvg avg filters only */ | |
| 50 for (i = 0; i <= fi->fs->np; i++) | |
| 51 fi->v[i] = 0.0; | |
| 52 } | |
| 53 return fi; | |
| 54 } | |
| 55 | |
| 56 void filter_delete(filter_t *fi) | |
| 57 { | |
| 58 if (fi) | |
| 59 free(fi); | |
| 60 } | |
| 61 | |
| 62 float filter_step(filter_t *fi, float x) | |
| 63 { | |
| 64 return fi->fs->fsf(fi, x); | |
| 65 } | |
| 66 | |
| 67 cfilter_t *cfilter_create(fspec_t *fs) | |
| 68 { | |
| 69 cfilter_t *cfi; | |
| 70 | |
| 71 cfi = (cfilter_t *) malloc(sizeof (cfilter_t)); | |
| 72 cfi->ref = filter_create(fs); | |
| 73 cfi->imf = filter_create(fs); | |
| 74 return cfi; | |
| 75 } | |
| 76 | |
| 77 void cfilter_delete(cfilter_t *cfi) | |
| 78 { | |
| 79 if (cfi) | |
| 80 { | |
| 81 filter_delete(cfi->ref); | |
| 82 filter_delete(cfi->imf); | |
| 83 } | |
| 84 } | |
| 85 | |
| 86 complexf_t cfilter_step(cfilter_t *cfi, const complexf_t *z) | |
| 87 { | |
| 88 complexf_t cc; | |
| 89 | |
| 90 cc.re = filter_step(cfi->ref, z->re); | |
| 91 cc.im = filter_step(cfi->imf, z->im); | |
| 92 return cc; | |
| 93 } |