Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/complex_filters.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
|---|---|
| date | Fri, 25 Jun 2010 15:50:58 +0200 |
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| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * complex_filters.h | |
| 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 Lesser General Public License version 2.1, | |
| 14 * as 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 Lesser General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU Lesser General Public | |
| 22 * License 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.h,v 1.14 2009/02/03 16:28:41 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 #if !defined(_SPANDSP_COMPLEX_FILTERS_H_) | |
| 29 #define _SPANDSP_COMPLEX_FILTERS_H_ | |
| 30 | |
| 31 typedef struct filter_s filter_t; | |
| 32 | |
| 33 typedef float (*filter_step_func_t)(filter_t *fi, float x); | |
| 34 | |
| 35 /*! Filter state */ | |
| 36 typedef struct | |
| 37 { | |
| 38 int nz; | |
| 39 int np; | |
| 40 filter_step_func_t fsf; | |
| 41 } fspec_t; | |
| 42 | |
| 43 struct filter_s | |
| 44 { | |
| 45 fspec_t *fs; | |
| 46 float sum; | |
| 47 int ptr; /* Only for moving average filters */ | |
| 48 float v[]; | |
| 49 }; | |
| 50 | |
| 51 typedef struct | |
| 52 { | |
| 53 filter_t *ref; | |
| 54 filter_t *imf; | |
| 55 } cfilter_t; | |
| 56 | |
| 57 #if defined(__cplusplus) | |
| 58 extern "C" | |
| 59 { | |
| 60 #endif | |
| 61 | |
| 62 SPAN_DECLARE(filter_t *) filter_create(fspec_t *fs); | |
| 63 SPAN_DECLARE(void) filter_delete(filter_t *fi); | |
| 64 SPAN_DECLARE(float) filter_step(filter_t *fi, float x); | |
| 65 | |
| 66 SPAN_DECLARE(cfilter_t *) cfilter_create(fspec_t *fs); | |
| 67 SPAN_DECLARE(void) cfilter_delete(cfilter_t *cfi); | |
| 68 SPAN_DECLARE(complexf_t) cfilter_step(cfilter_t *cfi, const complexf_t *z); | |
| 69 | |
| 70 #if defined(__cplusplus) | |
| 71 } | |
| 72 #endif | |
| 73 | |
| 74 #endif | |
| 75 /*- End of file ------------------------------------------------------------*/ |