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54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* 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 library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*
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* Note: 7th December 2004: This file used to be licensed under the GPL,
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* but we got permission from Ralp Loader to relicense it to LGPL.
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*
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*
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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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/* Convolution stuff */
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typedef struct _struct_convolve_state 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 (const int * lastchoice,
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const short int * 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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