Evaluating option strings
[AVOptions]

This group of functions can be used to evaluate option strings and get numbers out of them. More...

Functions
int	av_opt_eval_flags (void *obj, const AVOption *o, const char *val, int *flags_out)
int	av_opt_eval_int (void *obj, const AVOption *o, const char *val, int *int_out)
int	av_opt_eval_int64 (void *obj, const AVOption *o, const char *val, int64_t *int64_out)
int	av_opt_eval_float (void *obj, const AVOption *o, const char *val, float *float_out)
int	av_opt_eval_double (void *obj, const AVOption *o, const char *val, double *double_out)
int	av_opt_eval_q (void *obj, const AVOption *o, const char *val, AVRational *q_out)

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Detailed Description

This group of functions can be used to evaluate option strings and get numbers out of them.

They do the same thing as av_opt_set(), except the result is written into the caller-supplied pointer.

Parameters:

	obj	a struct whose first element is a pointer to AVClass.
	o	an option for which the string is to be evaluated.
	val	string to be evaluated.
	*_out	value of the string will be written here.

Returns:

0 on success, a negative number on failure.

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Function Documentation

int av_opt_eval_double	(	void *	obj,
		const AVOption *	o,
		const char *	val,
		double *	double_out
	)

int av_opt_eval_flags	(	void *	obj,
		const AVOption *	o,
		const char *	val,
		int *	flags_out
	)

int av_opt_eval_float	(	void *	obj,
		const AVOption *	o,
		const char *	val,
		float *	float_out
	)

int av_opt_eval_int	(	void *	obj,
		const AVOption *	o,
		const char *	val,
		int *	int_out
	)

int av_opt_eval_int64	(	void *	obj,
		const AVOption *	o,
		const char *	val,
		int64_t *	int64_out
	)

int av_opt_eval_q	(	void *	obj,
		const AVOption *	o,
		const char *	val,
		AVRational *	q_out
	)