Describe the class of an AVClass context structure.
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#include <log.h>
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 67 of file log.h.
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 72 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.
Definition at line 78 of file log.h.
a pointer to the first option specified in the class if any or NULL
- See Also
- av_set_default_options()
Definition at line 85 of file log.h.
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 93 of file log.h.
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 99 of file log.h.
int AVClass::parent_log_context_offset |
Offset in the structure where a pointer to the parent context for logging is stored.
For example a decoder could pass its AVCodecContext to eval as such a parent context, which an av_log() implementation could then leverage to display the parent context. The offset can be NULL.
Definition at line 108 of file log.h.
void*(* AVClass::child_next)(void *obj, void *prev) |
Return next AVOptions-enabled child or NULL.
Definition at line 113 of file log.h.
const struct AVClass*(* AVClass::child_class_next)(const struct AVClass *prev) |
Return an AVClass corresponding to the next potential AVOptions-enabled child.
The difference between child_next and this is that child_next iterates over already existing objects, while child_class_next iterates over all possible children.
Definition at line 123 of file log.h.
Category used for visualization (like color) This is only set if the category is equal for all objects using this class.
available since version (51 << 16 | 56 << 8 | 100)
Definition at line 130 of file log.h.
Callback to return the category.
available since version (51 << 16 | 59 << 8 | 100)
Definition at line 136 of file log.h.
int(* AVClass::query_ranges)(struct AVOptionRanges **, void *obj, const char *key, int flags) |
Callback to return the supported/allowed ranges.
available since version (52.12)
Definition at line 142 of file log.h.
The documentation for this struct was generated from the following file: