* @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 ff_eval2(const 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);
+ void *opaque, const char **error);
typedef struct ff_expr_s AVEvalExpr;
* @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,
+AVEvalExpr * ff_parse(const char *s, const char **const_name,
double (**func1)(void *, double), const char **func1_name,
double (**func2)(void *, double, double), char **func2_name,
- char **error);
+ const char **error);
/**
* Evaluates a previously parsed expression.
* @param const_value a zero terminated array of values for the identifers from ff_parse const_name