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/*
filter.h:
Copyright (C) 1997 Michael A. Casey, John ffitch
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound 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 Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
/* filter.h */
/* Author: Michael A. Casey
* Language: C
* Copyright (C) 1997 Michael A. Casey, MIT Media Lab, All Rights Reserved
*
*/
#ifndef __filter_h
#define __filter_h
#define MAXZEROS 50 /* Allow up to 50th-order digital filters */
#define MAXPOLES 50
/* Csound structure for FILTER opcode */
typedef struct {
OPDS h;
MYFLT *out; /* output signal */
MYFLT *in; /* input signal */
MYFLT *nb, *na; /* filter-order input arguments */
MYFLT *coeffs[MAXPOLES+MAXZEROS+1]; /* filter-coefficient input arguments */
MYFLT *d1,*d2; /* These allow ZFILTER to access FILTER routines */
int32_t numa; /* i-var p-time storage registers */
int32_t numb;
double dcoeffs[MAXPOLES+MAXZEROS+1]; /* filter-coefficient double arguments */
AUXCH delay; /* delay-line state memory base pointer */
double* currPos; /* delay-line current position pointer */ /* >>Was float<< */
int32_t ndelay; /* length of delay line (i.e. filter order) */
} FILTER;
typedef struct {
OPDS h;
MYFLT *out; /* output signal */
MYFLT *in; /* input signal */
MYFLT *kmagf, *kphsf; /* magnitude and phase pole nudging factors */
MYFLT *nb, *na; /* filter-order input arguments */
MYFLT *coeffs[MAXPOLES+MAXZEROS+1]; /* filter-coefficient input arguments */
int32_t numa; /* i-var p-time storage registers */
int32_t numb;
double dcoeffs[MAXPOLES+MAXZEROS+1]; /* filter-coefficient double arguments */
AUXCH delay; /* delay-line state memory base pointer */
double* currPos; /* delay-line current position pointer */ /* >>Was float<< */
int32_t
ndelay; /* length of delay line (i.e. filter order) */
AUXCH roots; /* pole roots memory for zfilter */
} ZFILTER;
#endif
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