[Bug 773261] gstplayer: Add some gstplayer API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773261

--- Comment #5 from Lyon <lyon.wang at nxp.com> ---
Created attachment 338085
  --> https://bugzilla.gnome.org/attachment.cgi?id=338085&action=edit
subtitle setting API

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