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62 lines
1.7 KiB
62 lines
1.7 KiB
15 years ago
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/* convolve.h: Header for convolutions.
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*
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* Copyright (C) 1999 Ralph Loader <suckfish@ihug.co.nz>
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*
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* This program 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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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef CONVOLVE_H
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#define CONVOLVE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* convolve_match takes two blocks, one twice the size of the other. The
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* sizes of these are CONVOLVE_BIG and CONVOLVE_SMALL respectively. */
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#define CONVOLVE_DEPTH 8
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#define CONVOLVE_SMALL (1 << CONVOLVE_DEPTH)
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#define CONVOLVE_BIG (CONVOLVE_SMALL * 2)
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typedef union stack_entry_s
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{
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struct {const double * left, * right; double * out;} v;
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struct {double * main, * null;} b;
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} stack_entry;
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#define STACK_SIZE (CONVOLVE_DEPTH * 3)
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typedef struct convolve_state {
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double left [CONVOLVE_BIG];
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double right [CONVOLVE_SMALL * 3];
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double scratch [CONVOLVE_SMALL * 3];
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stack_entry stack[STACK_SIZE];
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} convolve_state;
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convolve_state *convolve_init (void);
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void convolve_close (convolve_state * state);
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int convolve_match (float * lastchoice,
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float * input,
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convolve_state * state);
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#ifdef __cplusplus
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}
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#endif
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#endif
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