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/* convolve.h: Header for convolutions.
*
* Copyright (C) 1999 Ralph Loader <suckfish@ihug.co.nz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef CONVOLVE_H
#define CONVOLVE_H
#ifdef __cplusplus
extern "C" {
#endif
/* convolve_match takes two blocks, one twice the size of the other. The
* sizes of these are CONVOLVE_BIG and CONVOLVE_SMALL respectively. */
#define CONVOLVE_DEPTH 8
#define CONVOLVE_SMALL (1 << CONVOLVE_DEPTH)
#define CONVOLVE_BIG (CONVOLVE_SMALL * 2)
typedef union stack_entry_s
{
struct {const double * left, * right; double * out;} v;
struct {double * main, * null;} b;
} stack_entry;
#define STACK_SIZE (CONVOLVE_DEPTH * 3)
typedef struct convolve_state {
double left [CONVOLVE_BIG];
double right [CONVOLVE_SMALL * 3];
double scratch [CONVOLVE_SMALL * 3];
stack_entry stack[STACK_SIZE];
} convolve_state;
convolve_state *convolve_init (void);
void convolve_close (convolve_state * state);
int convolve_match (float * lastchoice,
float * input,
convolve_state * state);
#ifdef __cplusplus
}
#endif
#endif
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