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b2f86c17 PI |
1 | /* |
2 | * simple arithmetic expression evaluator | |
3 | * | |
4 | * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> | |
5 | * | |
b78e7197 DB |
6 | * This file is part of FFmpeg. |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
b2f86c17 PI |
9 | * modify it under the terms of the GNU Lesser General Public |
10 | * License as published by the Free Software Foundation; either | |
b78e7197 | 11 | * version 2.1 of the License, or (at your option) any later version. |
b2f86c17 | 12 | * |
b78e7197 | 13 | * FFmpeg is distributed in the hope that it will be useful, |
b2f86c17 PI |
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 | |
b78e7197 | 19 | * License along with FFmpeg; if not, write to the Free Software |
b2f86c17 PI |
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) | |
671adb17 MC |
32 | /** |
33 | * @deprecated Use ff_eval2 instead | |
34 | */ | |
b2f86c17 PI |
35 | double ff_eval(char *s, double *const_value, const char **const_name, |
36 | double (**func1)(void *, double), const char **func1_name, | |
37 | double (**func2)(void *, double, double), char **func2_name, | |
38 | void *opaque); | |
39 | #endif | |
21d4d5da MN |
40 | |
41 | /** | |
42 | * Parses and evaluates an expression. | |
483b8b12 | 43 | * Note, this is significantly slower than ff_parse_eval() |
21d4d5da MN |
44 | * @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)" |
45 | * @param func1 NULL terminated array of function pointers for functions which take 1 argument | |
46 | * @param func2 NULL terminated array of function pointers for functions which take 2 arguments | |
47 | * @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0} | |
48 | * @param func1_name NULL terminated array of zero terminated strings of func1 identifers | |
49 | * @param func2_name NULL terminated array of zero terminated strings of func2 identifers | |
50 | * @param error pointer to a char* which is set to an error message if something goes wrong | |
51 | * @param const_value a zero terminated array of values for the identifers from const_name | |
52 | * @param opaque a pointer which will be passed to all functions from func1 and func2 | |
53 | * @return the value of the expression | |
54 | */ | |
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55 | double ff_eval2(char *s, double *const_value, const char **const_name, |
56 | double (**func1)(void *, double), const char **func1_name, | |
57 | double (**func2)(void *, double, double), char **func2_name, | |
58 | void *opaque, char **error); | |
59 | ||
85b4eb08 | 60 | typedef struct ff_expr_s AVEvalExpr; |
21d4d5da MN |
61 | |
62 | /** | |
63 | * Parses a expression. | |
64 | * @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)" | |
65 | * @param func1 NULL terminated array of function pointers for functions which take 1 argument | |
66 | * @param func2 NULL terminated array of function pointers for functions which take 2 arguments | |
67 | * @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0} | |
68 | * @param func1_name NULL terminated array of zero terminated strings of func1 identifers | |
69 | * @param func2_name NULL terminated array of zero terminated strings of func2 identifers | |
70 | * @param error pointer to a char* which is set to an error message if something goes wrong | |
71 | * @return AVEvalExpr which must be freed with ff_eval_free by the user when its not needed anymore | |
72 | * NULL if anything went wrong | |
73 | */ | |
85b4eb08 OS |
74 | AVEvalExpr * ff_parse(char *s, const char **const_name, |
75 | double (**func1)(void *, double), const char **func1_name, | |
76 | double (**func2)(void *, double, double), char **func2_name, | |
77 | char **error); | |
21d4d5da MN |
78 | /** |
79 | * Evaluates a previously parsed expression. | |
80 | * @param const_value a zero terminated array of values for the identifers from ff_parse const_name | |
81 | * @param opaque a pointer which will be passed to all functions from func1 and func2 | |
82 | * @return the value of the expression | |
83 | */ | |
85b4eb08 OS |
84 | double ff_parse_eval(AVEvalExpr * e, double *const_value, void *opaque); |
85 | void ff_eval_free(AVEvalExpr * e); | |
86 | ||
b2f86c17 | 87 | #endif /* AVCODEC_EVAL_H */ |