AVClass

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.).

extern (C)

struct AVClass {

const

char* class_name;

const

char* function(void* ctx) item_name;

const

AVOption* option;

int ver;

int log_level_offset_offset;

int parent_log_context_offset;

void* function(void* obj, void* prev) child_next;

const

AVClass* function(const AVClass* prev) child_class_next;

}

Members

Variables

child_class_next AVClass* function(const AVClass* prev) child_class_next;: Return an AVClass corresponding to next potential AVOptions-enabled child.
child_next void* function(void* obj, void* prev) child_next;: Return next AVOptions-enabled child or NULL
class_name 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.
item_name char* function(void* ctx) item_name;: A pointer to a function which returns the name of a context instance ctx associated with the class.
log_level_offset_offset int log_level_offset_offset;: Offset in the structure where log_level_offset is stored. 0 means there is no such variable
option AVOption* option;: a pointer to the first option specified in the class if any or NULL
parent_log_context_offset int 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
ver int ver;: LIBAVUTIL_VERSION with which this structure was created. This is used to allow fields to be added without requiring major version bumps everywhere.

AVClass

Members

Variables

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