1 /* convolve.h: Header for convolutions.
3 * Copyright (C) 1999 Ralph Loader <suckfish@ihug.co.nz>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
21 * Note: 7th December 2004: This file used to be licensed under the GPL,
22 * but we got permission from Ralp Loader to relicense it to LGPL.
34 /* convolve_match takes two blocks, one twice the size of the other. The
35 * sizes of these are CONVOLVE_BIG and CONVOLVE_SMALL respectively. */
36 #define CONVOLVE_DEPTH 8
37 #define CONVOLVE_SMALL (1 << CONVOLVE_DEPTH)
38 #define CONVOLVE_BIG (CONVOLVE_SMALL * 2)
40 /* Convolution stuff */
41 typedef struct _struct_convolve_state convolve_state;
43 convolve_state *convolve_init (void);
44 void convolve_close (convolve_state * state);
46 int convolve_match (const int * lastchoice,
47 const short int * input,
48 convolve_state * state);