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You can not change a playlist_item_t to be a node, when you previously registered events on it, using input_item_t sub items adding event, because the pointer will be destroyed.
If you want to use nodes anyway, you have to explicitely create them.
Note: we were lucky that xspf did work so far, because we were EXCLUSIVELY using invalid pointers, except for the 1st item being added to each playlist_item_t (it did happen before the conversion obviously).

playlist/services_discovery.c: Send service discover started and ended events, to keep track of running sd.

* Add the ability to store user data in media_descriptor.
* Duration can now be retrieved from a media_instance
* Can new get the preparsed state of a media_descriptor
* Add callbacks for libvlc_MediaDescriptorDurationChanged/vlc_InputItemDurationChanged and libvlc_MediaDescriptorPreparsedChanged/vlc_InputItemPreparsedChanged.

playlist/services_discovery.c: Improved services_discovery object, playlist independant. Now, the services_discovery plugin have to be converted to use this interface.

include/vlc_events.h: Opt for the vlc_object_name_function_name naming scheme.

misc/events.c: Add a new way to send receive events. (ripped of from libvlc). It will allow input_item to send events.