From 21d4d5dafb822ace6847380ce5736222f9ccce80 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 3 Nov 2006 20:30:22 +0000 Subject: doxy Originally committed as revision 6893 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/eval.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'libavcodec/eval.h') diff --git a/libavcodec/eval.h b/libavcodec/eval.h index 05a2f1ef2a..4ce59cca6a 100644 --- a/libavcodec/eval.h +++ b/libavcodec/eval.h @@ -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); -- cgit v1.2.3