[Bug 773570] gstplayer: add media info get track num API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773570

--- Comment #4 from Lyon <lyon.wang at nxp.com> ---
Created attachment 342253
  --> https://bugzilla.gnome.org/attachment.cgi?id=342253&action=edit
Updated patch for get_number_of_streams

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