new optimized eval method, by seperating parsing and runtime
[libav.git] / libavcodec / eval.h
1 /*
2 * simple arithmetic expression evaluator
3 *
4 * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file eval.h
25 * eval header.
26 */
27
28 #ifndef AVCODEC_EVAL_H
29 #define AVCODEC_EVAL_H
30
31 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
32 double ff_eval(char *s, double *const_value, const char **const_name,
33 double (**func1)(void *, double), const char **func1_name,
34 double (**func2)(void *, double, double), char **func2_name,
35 void *opaque);
36 #endif
37 double ff_eval2(char *s, double *const_value, const char **const_name,
38 double (**func1)(void *, double), const char **func1_name,
39 double (**func2)(void *, double, double), char **func2_name,
40 void *opaque, char **error);
41
42 typedef struct ff_expr_s AVEvalExpr;
43 AVEvalExpr * ff_parse(char *s, const char **const_name,
44 double (**func1)(void *, double), const char **func1_name,
45 double (**func2)(void *, double, double), char **func2_name,
46 char **error);
47 double ff_parse_eval(AVEvalExpr * e, double *const_value, void *opaque);
48 void ff_eval_free(AVEvalExpr * e);
49
50 #endif /* AVCODEC_EVAL_H */