Mercurial > hg > audiostuff
view spandsp-0.0.6pre17/src/spandsp/complex_filters.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 15:50:58 +0200 |
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/* * SpanDSP - a series of DSP components for telephony * * complex_filters.h * * 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 Lesser General Public License version 2.1, * 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser 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.h,v 1.14 2009/02/03 16:28:41 steveu Exp $ */ #if !defined(_SPANDSP_COMPLEX_FILTERS_H_) #define _SPANDSP_COMPLEX_FILTERS_H_ typedef struct filter_s filter_t; typedef float (*filter_step_func_t)(filter_t *fi, float x); /*! Filter state */ typedef struct { int nz; int np; filter_step_func_t fsf; } fspec_t; struct filter_s { fspec_t *fs; float sum; int ptr; /* Only for moving average filters */ float v[]; }; typedef struct { filter_t *ref; filter_t *imf; } cfilter_t; #if defined(__cplusplus) extern "C" { #endif SPAN_DECLARE(filter_t *) filter_create(fspec_t *fs); SPAN_DECLARE(void) filter_delete(filter_t *fi); SPAN_DECLARE(float) filter_step(filter_t *fi, float x); SPAN_DECLARE(cfilter_t *) cfilter_create(fspec_t *fs); SPAN_DECLARE(void) cfilter_delete(cfilter_t *cfi); SPAN_DECLARE(complexf_t) cfilter_step(cfilter_t *cfi, const complexf_t *z); #if defined(__cplusplus) } #endif #endif /*- End of file ------------------------------------------------------------*/