73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* filter.h -- FIR filter
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*
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* Copyright (C) 2001, 2002, 2003, 2004
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* Tomi Manninen (oh2bns@sral.fi)
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*
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* This file is part of gMFSK.
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*
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* gMFSK is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* gMFSK is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gMFSK; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef _FILTER_H
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#define _FILTER_H
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#define BufferLen 1024
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/* ---------------------------------------------------------------------- */
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#ifdef __OPTIMIZE__
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#ifdef __i386__
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#include "filter-i386.h"
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#endif /* __i386__ */
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#ifndef __HAVE_ARCH_MAC
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static __inline__ float filter_mac(const float *a, const float *b, int size)
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{
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float sum = 0;
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int i;
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for (i = 0; i < size; i++)
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sum += a[i] * b[i];
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return sum;
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}
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#endif /* __HAVE_ARCH_MAC */
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#endif /* __OPTIMIZE__ */
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/* ---------------------------------------------------------------------- */
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struct filter {
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int length;
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float *taps;
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float buffer[BufferLen];
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int pointer;
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};
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extern struct filter *filter_init(int len, float *taps);
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extern void filter_free(struct filter *f);
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extern void filter_run(struct filter *f, float in, float *out);
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extern short filter_run_buf(struct filter *f, short *in, float *out, int step, int len);
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/* ---------------------------------------------------------------------- */
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#endif /* _FILTER_H */
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