Revision 9ace13b4 libavcodec/eval.h

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libavcodec/eval.h
32 32 
 * Parses and evaluates an expression.
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 * Note, this is significantly slower than ff_eval_expr().
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 *
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 * @param res a pointer to a double where is put the result value of
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 * the expression, or NAN in case of error
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 * @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
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 * @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
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 * @param const_value a zero terminated array of values for the identifers from const_name
......
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 * @param func2 NULL terminated array of function pointers for functions which take 2 arguments
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 * @param opaque a pointer which will be passed to all functions from func1 and func2
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 * @param log_ctx parent logging context
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 * @return the value of the expression
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 * @return 0 in case of success, a negative value corresponding to an
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 * AVERROR code otherwise
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 */
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double ff_parse_and_eval_expr(const char *s,
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int ff_parse_and_eval_expr(double *res, const char *s,
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                              const char * const *const_name, const double *const_value,
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                              const char * const *func1_name, double (* const *func1)(void *, double),
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                              const char * const *func2_name, double (* const *func2)(void *, double, double),
......
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/**
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 * Parses an expression.
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 *
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 * @param expr a pointer where is put an AVExpr containing the parsed
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 * value in case of successfull parsing, or NULL otherwise.
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 * The pointed to AVExpr must be freed with ff_free_expr() by the user
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 * when it is not needed anymore.
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 * @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
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 * @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
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 * @param func1_name NULL terminated array of zero terminated strings of func1 identifers
......
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 * @param func2_name NULL terminated array of zero terminated strings of func2 identifers
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 * @param func2 NULL terminated array of function pointers for functions which take 2 arguments
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 * @param log_ctx parent logging context
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 * @return AVExpr which must be freed with ff_free_expr() by the user when it is not needed anymore
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 *         NULL if anything went wrong
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 * @return 0 in case of success, a negative value corresponding to an
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 * AVERROR code otherwise
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 */
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AVExpr *ff_parse_expr(const char *s,
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int ff_parse_expr(AVExpr **expr, const char *s,
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                      const char * const *const_name,
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                      const char * const *func1_name, double (* const *func1)(void *, double),
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                      const char * const *func2_name, double (* const *func2)(void *, double, double),

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