Since itunes: and media: namespaced elements are essentially just enclosures and metadata for enclosures, we should normalize these like we do RSS/Atom handling. There are a few things to keep in mind, however:
* Because Media RSS has [media:group]s, one enclosure can have several versions of the same content (if we define an enclosure as a piece of content rather than just a file)
* If there are zero [media:group]s, we can simply handle these are get_enclosure(0), get_enclosure(1), etc. Each enlosure would be treated as separate content.
* If there is one [media:group]s, we can simply handle these are get_enclosure(0)->get_link(0), get_enclosure(0)->get_link(1), etc. [enclosure] would be handled as part of this [media:group]
* If there are two or more [media:group]s, we can simply handle these are get_enclosure(0)->get_link(0), get_enclosure(0)->get_link(1), etc. First [enclosure] would be handled as part of the first [media:group], the second would group with the second, etc. (It would really help to have a test feed for this to see if the solution makes sense.)
Problems:
* [media:thumbnail] is on a per-content basis. Perhaps in the case of zero or one [media:group]s, we can simply apply this same thumbnail to all files.
* What do we do if there are multiple [media:group]s? Logically, we would support them the same way we do multiple enclosures, but then we have multiple[multiple] enclosures/groups.
Possible Solution:
* We can have enclosures with (possibly) multiple links. We can handle this as $enclosure->get_link($key=0), with only one $enclosure->get_thumbnail(), and multiple categories as $enclosure->get_category($key=0) (like we do with items).
* It is around this solution that I wrote the attached pseudocode.
Another Possible Solution:
Another possible solution would be to have other functions that are specific to MediaRSS/iTunes (i.e. $item->media_group(0)->get_content(0)->get_link()) that would allow power users to have the kind of control they want. The standard enclosure() object (which would essentially be the easier-to-use version) would simply use the first file available (after obeying $feed->sort_enclosures(), [media:content isDefault], etc.)
Read the attached pseudocode for some of the ideas I put together. Im also wondering if we should open this discussion to end-users to see if they have any valuable input