[Bug 720596] missing-plugins: Add funcs to generate detail and installer desc from GstStructures

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720596
  GStreamer | gst-plugins-base | unspecified

--- Comment #5 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2013-12-17 11:42:01 UTC ---
I don't understand the discoverer API for the missing plugin stuff, it looks
very weird.

You get the GstStructure from a missing-plugin message via
gst_discoverer_get_misc() [what a name...]?

Thing is, there might be multiple missing plugin messages, not just one. I
think we should make new API for that and either just return a list of
messages, or return an array of installer detail strings like we do in

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstParse.html#gst-parse-context-get-missing-elements

I think any API should be limited to either messages or installer strings, the
GstStructure of GstMessage is all but an implementation detail here.

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