[Bug 728029] rtsp-media: Make media_prepare() virtual

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=728029
  GStreamer | gst-rtsp-server | git

--- Comment #1 from Ognyan Tonchev <ognyan.tonchev at axis.com> 2014-04-11 10:44:42 UTC ---
Created an attachment (id=274074)
 View: https://bugzilla.gnome.org/attachment.cgi?id=274074
 Review: https://bugzilla.gnome.org/review?bug=728029&attachment=274074

media: Make media_prepare() virtual

With this patch default_prepare() does exactly the reverse of what
default_unprepare() does.

The patch can probably be split in 3 different patches since it also fixes some
issues with the current implementation:

* Allow the #thread argument in media_prepare() to be NULL as stated in the
documentation.
* Stop the thread in the error cases when it is not going to be used.

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