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Originally committed as revision 6893 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-11-03 20:30:22 +00:00
parent b1d196db56
commit 21d4d5dafb
1 changed files with 34 additions and 0 deletions
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34
libavcodec/eval.h
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@ -34,16 +34,50 @@ double ff_eval(char *s, double *const_value, const char **const_name,
double (**func2)(void *, double, double), char **func2_name,
void *opaque);
#endif
/**
* Parses and evaluates an expression.
* Note, this is significantly slower then 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 its 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);