libavcodec/eval.h File Reference

eval header. More...

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Typedefs
typedef struct ff_expr_s	AVEvalExpr
Functions
double	ff_eval2 (const char *s, const double *const_value, const char *const *const_name, double(**func1)(void *, double), const char **func1_name, double(**func2)(void *, double, double), const char **func2_name, void *opaque, const char **error)
	Parses and evaluates an expression.
AVEvalExpr *	ff_parse (const char *s, const char *const *const_name, double(**func1)(void *, double), const char **func1_name, double(**func2)(void *, double, double), const char **func2_name, const char **error)
	Parses a expression.
double	ff_parse_eval (AVEvalExpr *e, const double *const_value, void *opaque)
	Evaluates a previously parsed expression.
void	ff_eval_free (AVEvalExpr *e)

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Detailed Description

eval header.

Definition in file eval.h.

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Typedef Documentation

typedef struct ff_expr_s AVEvalExpr

Definition at line 50 of file eval.h.

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Function Documentation

double ff_eval2	(	const char *	s,
		const double *	const_value,
		const char *const *	const_name,
		double(**)(void *, double)	func1,
		const char **	func1_name,
		double(**)(void *, double, double)	func2,
		const char **	func2_name,
		void *	opaque,
		const char **	error
	)

Parses and evaluates an expression.

Note, this is significantly slower than ff_parse_eval()

Parameters:

	s	expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
	func1	NULL terminated array of function pointers for functions which take 1 argument
	func2	NULL terminated array of function pointers for functions which take 2 arguments
	const_name	NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
	func1_name	NULL terminated array of zero terminated strings of func1 identifers
	func2_name	NULL terminated array of zero terminated strings of func2 identifers
	error	pointer to a char* which is set to an error message if something goes wrong
	const_value	a zero terminated array of values for the identifers from const_name
	opaque	a pointer which will be passed to all functions from func1 and func2

Returns:

the value of the expression

Definition at line 415 of file eval.c.

Referenced by av_set_string3().

void ff_eval_free

(

AVEvalExpr *

e

)

Definition at line 187 of file eval.c.

Referenced by ff_eval2(), ff_eval_free(), ff_parse(), ff_rate_control_uninit(), parse_primary(), and Release().

AVEvalExpr* ff_parse	(	const char *	s,
		const char *const *	const_name,
		double(**)(void *, double)	func1,
		const char **	func1_name,
		double(**)(void *, double, double)	func2,
		const char **	func2_name,
		const char **	error
	)

Parses a expression.

Parameters:

	s	expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
	func1	NULL terminated array of function pointers for functions which take 1 argument
	func2	NULL terminated array of function pointers for functions which take 2 arguments
	const_name	NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
	func1_name	NULL terminated array of zero terminated strings of func1 identifers
	func2_name	NULL terminated array of zero terminated strings of func2 identifers
	error	pointer to a char* which is set to an error message if something goes wrong

Returns:

AVEvalExpr which must be freed with ff_eval_free by the user when it is not needed anymore NULL if anything went wrong

Definition at line 378 of file eval.c.

Referenced by Configure(), ff_eval2(), and ff_rate_control_init().

double ff_parse_eval	(	AVEvalExpr *	e,
		const double *	const_value,
		void *	opaque
	)

Evaluates a previously parsed expression.

Parameters:

	const_value	a zero terminated array of values for the identifers from ff_parse const_name
	opaque	a pointer which will be passed to all functions from func1 and func2

Returns:

the value of the expression

Definition at line 407 of file eval.c.

Referenced by ff_eval2(), get_qscale(), and Process().