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AVOptions: add AV_OPT_SEARCH_FAKE_OBJ flag for av_opt_find().

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It allows to search for options only with AVClass, without allocating
the corresponding context.
This commit is contained in:
Anton Khirnov
2011-08-23 07:11:26 +02:00
parent 5938e02185
commit c11fb8288d
5 changed files with 15 additions and 3 deletions
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9
libavutil/opt.h
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@@ -215,6 +215,13 @@ int av_opt_set_dict(void *obj, struct AVDictionary **options);
#define AV_OPT_SEARCH_CHILDREN 0x0001 /**< Search in possible children of the
given object first. */
/**
* The obj passed to av_opt_find() is fake -- only a double pointer to AVClass
* instead of a required pointer to a struct containing AVClass. This is
* useful for searching for options without needing to allocate the corresponding
* object.
*/
#define AV_OPT_SEARCH_FAKE_OBJ 0x0002
/**
* Look for an option in an object. Consider only options which
@@ -222,6 +229,8 @@ int av_opt_set_dict(void *obj, struct AVDictionary **options);
*
* @param[in] obj A pointer to a struct whose first element is a
* pointer to an AVClass.
* Alternatively a double pointer to an AVClass, if
* AV_OPT_SEARCH_FAKE_OBJ search flag is set.
* @param[in] name The name of the option to look for.
* @param[in] unit When searching for named constants, name of the unit
* it belongs to.