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. Подробнее...

Граф связей класса Evaluating option strings:

Функции
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)

Подробное описание

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.

Аргументы

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.

Возвращает: 0 on success, a negative number on failure.

Функции

◆ av_opt_eval_flags()

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

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/opt.h>

◆ av_opt_eval_int()

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

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/opt.h>

◆ av_opt_eval_int64()

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

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/opt.h>

◆ av_opt_eval_float()

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

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/opt.h>

◆ av_opt_eval_double()

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

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/opt.h>

◆ av_opt_eval_q()

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

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/opt.h>