AVClass Struct Reference

Describe the class of an AVClass context structure. More...

#include <log.h>

Data Fields
const char *	class_name
	The name of the class; usually it is the same name as the context structure type to which the AVClass is associated.
const char *(*	item_name )(void *ctx)
	A pointer to a function which returns the name of a context instance ctx associated with the class.
struct AVOption *	option
	a pointer to the first option specified in the class if any or NULL
int	version
	LIBAVUTIL_VERSION with which this structure was created.
int	log_level_offset_offset
	Offset in the structure where log_level_offset is stored.
int	parent_log_context_offset
	Offset in the structure where a pointer to the parent context for loging is stored.
struct AVOption *(*	opt_find )(void *obj, const char *name, const char *unit, int opt_flags, int search_flags)
	A function for extended searching, e.g.

---

Detailed Description

Describe the class of an AVClass context structure.

That is an arbitrary struct of which the first field is a pointer to an AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).

Definition at line 32 of file log.h.

---

Field Documentation

const char* AVClass::class_name

The name of the class; usually it is the same name as the context structure type to which the AVClass is associated.

Definition at line 37 of file log.h.

const char*(* AVClass::item_name)(void *ctx)

A pointer to a function which returns the name of a context instance ctx associated with the class.

Referenced by av_log_default_callback(), and http_av_log().

int AVClass::log_level_offset_offset

Offset in the structure where log_level_offset is stored.

0 means there is no such variable

Definition at line 64 of file log.h.

Referenced by av_log().

struct AVOption*(* AVClass::opt_find)(void *obj, const char *name, const char *unit, int opt_flags, int search_flags) [read]

A function for extended searching, e.g.

in possible children objects.

Referenced by av_opt_find().

struct AVOption* AVClass::option [read]

a pointer to the first option specified in the class if any or NULL

See also:

av_set_default_options()

Definition at line 50 of file log.h.

int AVClass::parent_log_context_offset

Offset in the structure where a pointer to the parent context for loging is stored.

for example a decoder that uses eval.c could pass its AVCodecContext to eval as such parent context. And a av_log() implementation could then display the parent context can be NULL of course

Definition at line 72 of file log.h.

Referenced by av_log_default_callback().

int AVClass::version

LIBAVUTIL_VERSION with which this structure was created.

This is used to allow fields to be added without requiring major version bumps everywhere.

Definition at line 58 of file log.h.

Referenced by av_log().

---

The documentation for this struct was generated from the following file:

• libavutil/log.h