* libavcodec exports generic options, while its priv_data field exports
* codec-specific options). In such a case, it is possible to set up the
* parent struct to export a child's options. To do that, simply
- * implement AVClass.child_next() and AVClass.child_class_next() in the
+ * implement AVClass.child_next() and AVClass.child_class_iterate() in the
* parent struct's AVClass.
* Assuming that the test_struct from above now also contains a
* child_struct field:
* return t->child_struct;
* return NULL
* }
- * const AVClass child_class_next(const AVClass *prev)
+ * const AVClass child_class_iterate(void **iter)
* {
- * return prev ? NULL : &child_class;
+ * const AVClass *c = *iter ? NULL : &child_class;
+ * *iter = (void*)(uintptr_t)c;
+ * return c;
* }
* @endcode
- * Putting child_next() and child_class_next() as defined above into
+ * Putting child_next() and child_class_iterate() as defined above into
* test_class will now make child_struct's options accessible through
* test_struct (again, proper setup as described above needs to be done on
* child_struct right after it is created).
*
* From the above example it might not be clear why both child_next()
- * and child_class_next() are needed. The distinction is that child_next()
- * iterates over actually existing objects, while child_class_next()
+ * and child_class_iterate() are needed. The distinction is that child_next()
+ * iterates over actually existing objects, while child_class_iterate()
* iterates over all possible child classes. E.g. if an AVCodecContext
* was initialized to use a codec which has private options, then its
* child_next() will return AVCodecContext.priv_data and finish
- * iterating. OTOH child_class_next() on AVCodecContext.av_class will
+ * iterating. OTOH child_class_iterate() on AVCodecContext.av_class will
* iterate over all available codecs with private options.
*
* @subsection avoptions_implement_named_constants Named constants
* For enumerating there are basically two cases. The first is when you want to
* get all options that may potentially exist on the struct and its children
* (e.g. when constructing documentation). In that case you should call
- * av_opt_child_class_next() recursively on the parent struct's AVClass. The
+ * av_opt_child_class_iterate() recursively on the parent struct's AVClass. The
* second case is when you have an already initialized struct with all its
* children and you want to get all options that can be actually written or read
* from it. In that case you should call av_opt_child_next() recursively (and
#define AV_OPT_FLAG_RUNTIME_PARAM (1<<15) ///< a generic parameter which can be set by the user at runtime
#define AV_OPT_FLAG_FILTERING_PARAM (1<<16) ///< a generic parameter which can be set by the user for filtering
#define AV_OPT_FLAG_DEPRECATED (1<<17) ///< set if option is deprecated, users should refer to AVOption.help text for more information
+#define AV_OPT_FLAG_CHILD_CONSTS (1<<18) ///< set if option constants can also reside in child objects
//FIXME think about enc-audio, ... style flags
/**
/**
* Iterate over potential AVOptions-enabled children of parent.
*
- * @param prev result of a previous call to this function or NULL
+ * @param iter a pointer where iteration state is stored.
* @return AVClass corresponding to next potential child or NULL
*/
-const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev);
+const AVClass *av_opt_child_class_iterate(const AVClass *parent, void **iter);
/**
* @defgroup opt_set_funcs Option setting functions