Statistics
| Branch: | Revision:

ffmpeg / libavcodec / eval.h @ 5b21bdab

History | View | Annotate | Download (4 KB)

1 b2f86c17 Panagiotis Issaris
/*
2
 * simple arithmetic expression evaluator
3
 *
4
 * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
5
 *
6 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9 b2f86c17 Panagiotis Issaris
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
12 b2f86c17 Panagiotis Issaris
 *
13 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
14 b2f86c17 Panagiotis Issaris
 * 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 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
20 b2f86c17 Panagiotis Issaris
 * 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 5b21bdab Diego Biurrun
#ifndef FFMPEG_EVAL_H
29
#define FFMPEG_EVAL_H
30 b2f86c17 Panagiotis Issaris
31
#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
32 671adb17 Mark Cox
/**
33
 * @deprecated Use ff_eval2 instead
34
 */
35 b2f86c17 Panagiotis Issaris
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
40 21d4d5da Michael Niedermayer
41
/**
42
 * Parses and evaluates an expression.
43 483b8b12 Oded Shimon
 * Note, this is significantly slower than ff_parse_eval()
44 21d4d5da Michael Niedermayer
 * @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
 */
55 b2f86c17 Panagiotis Issaris
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
60 85b4eb08 Oded Shimon
typedef struct ff_expr_s AVEvalExpr;
61 21d4d5da Michael Niedermayer
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 90b5b51e Diego Biurrun
 * @return AVEvalExpr which must be freed with ff_eval_free by the user when it is not needed anymore
72 21d4d5da Michael Niedermayer
 *         NULL if anything went wrong
73
 */
74 85b4eb08 Oded Shimon
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);
78 21d4d5da Michael Niedermayer
/**
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
 */
84 85b4eb08 Oded Shimon
double ff_parse_eval(AVEvalExpr * e, double *const_value, void *opaque);
85
void ff_eval_free(AVEvalExpr * e);
86
87 5b21bdab Diego Biurrun
#endif /* FFMPEG_EVAL_H */