* when 0 then no av_free() nor av_strdup() will be used
* @return 0 if the value has been set, or an AVERROR code in case of
* error:
- * AVERROR(ENOENT) if no matching option exists
+ * AVERROR_OPTION_NOT_FOUND if no matching option exists
* AVERROR(ERANGE) if the value is out of range
* AVERROR(EINVAL) if the value is not valid
*/
*/
int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags);
+/**
+ * Set the values of all AVOption fields to their default values.
+ *
+ * @param s an AVOption-enabled struct (its first member must be a pointer to AVClass)
+ */
void av_opt_set_defaults(void *s);
+
+#if FF_API_OLD_AVOPTIONS
+attribute_deprecated
void av_opt_set_defaults2(void *s, int mask, int flags);
+#endif
/**
* Parse the key/value pairs list in opts. For each key/value pair
#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
*
* @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.