[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

Thibault Saunier <thibault.saunier> changed:

           What    |Removed                     |Added
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 Attachment #264404|0                           |1
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--- Comment #6 from Thibault Saunier <thibault.saunier at collabora.com> 2013-12-17 11:42:55 UTC ---
Created an attachment (id=264405)
 View: https://bugzilla.gnome.org/attachment.cgi?id=264405
 Review: https://bugzilla.gnome.org/review?bug=720596&attachment=264405

missing-plugins: Add funcs to generate detail and installer desc from
GstStructures

With the current API of GstDiscoverer we do not have access to the GstMessage
directly
but to its contained GstStructure, this lead to various application
basically copy pasting those method from pbutils in their code. Instead
add some simple API's to simplify the generation of those strings
directly from the GstStructure.

API:
  gst_missing_plugin_message_get_description_from_struct
  gst_missing_plugin_message_get_installer_detail_from_struct

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