[Bug 770331] player: Implement a playlist API and next/previous commands

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770331

--- Comment #23 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 351448
  --> https://bugzilla.gnome.org/attachment.cgi?id=351448&action=edit
player: only output media-info changed events with the first buffer

When switching streams, on a stream-start event, we were creating
the media info before the new stream had sent its tag events resulting
in the use of the previous stream's tag structure.

Change that by delaying the creation of the media info until the first
buffer arrives on the srcpad of the input (the same place EOS is
detected) and resetting the media info on every stream-start event after
concat.

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