88 lines
4.0 KiB
C
88 lines
4.0 KiB
C
/*
|
|
* simple arithmetic expression evaluator
|
|
*
|
|
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file eval.h
|
|
* eval header.
|
|
*/
|
|
|
|
#ifndef FFMPEG_EVAL_H
|
|
#define FFMPEG_EVAL_H
|
|
|
|
#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
|
|
/**
|
|
* @deprecated Use ff_eval2 instead
|
|
*/
|
|
double ff_eval(char *s, double *const_value, const char **const_name,
|
|
double (**func1)(void *, double), const char **func1_name,
|
|
double (**func2)(void *, double, double), char **func2_name,
|
|
void *opaque);
|
|
#endif
|
|
|
|
/**
|
|
* Parses and evaluates an expression.
|
|
* Note, this is significantly slower than ff_parse_eval()
|
|
* @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
|
|
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
|
|
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
|
|
* @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
|
|
* @param func1_name NULL terminated array of zero terminated strings of func1 identifers
|
|
* @param func2_name NULL terminated array of zero terminated strings of func2 identifers
|
|
* @param error pointer to a char* which is set to an error message if something goes wrong
|
|
* @param const_value a zero terminated array of values for the identifers from const_name
|
|
* @param opaque a pointer which will be passed to all functions from func1 and func2
|
|
* @return the value of the expression
|
|
*/
|
|
double ff_eval2(char *s, double *const_value, const char **const_name,
|
|
double (**func1)(void *, double), const char **func1_name,
|
|
double (**func2)(void *, double, double), char **func2_name,
|
|
void *opaque, char **error);
|
|
|
|
typedef struct ff_expr_s AVEvalExpr;
|
|
|
|
/**
|
|
* Parses a expression.
|
|
* @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
|
|
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
|
|
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
|
|
* @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
|
|
* @param func1_name NULL terminated array of zero terminated strings of func1 identifers
|
|
* @param func2_name NULL terminated array of zero terminated strings of func2 identifers
|
|
* @param error pointer to a char* which is set to an error message if something goes wrong
|
|
* @return AVEvalExpr which must be freed with ff_eval_free by the user when it is not needed anymore
|
|
* NULL if anything went wrong
|
|
*/
|
|
AVEvalExpr * ff_parse(char *s, const char **const_name,
|
|
double (**func1)(void *, double), const char **func1_name,
|
|
double (**func2)(void *, double, double), char **func2_name,
|
|
char **error);
|
|
/**
|
|
* Evaluates a previously parsed expression.
|
|
* @param const_value a zero terminated array of values for the identifers from ff_parse const_name
|
|
* @param opaque a pointer which will be passed to all functions from func1 and func2
|
|
* @return the value of the expression
|
|
*/
|
|
double ff_parse_eval(AVEvalExpr * e, double *const_value, void *opaque);
|
|
void ff_eval_free(AVEvalExpr * e);
|
|
|
|
#endif /* FFMPEG_EVAL_H */
|