[Bug 782228] adaptivedemux: Implement GST_SEEK_TYPE_END usage for live

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782228

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 351216
  --> https://bugzilla.gnome.org/attachment.cgi?id=351216&action=edit
adaptivedemux: Implement GST_SEEK_TYPE_END usage for live

When dealing with live streams, we can't rely on GstSegment calculation
since it uses the segment duration to calculate the absolute values.

But since we are dealing with live *and* we know the ranges, we can
compute the absolute seeking values using the range stop (i.e. "now")
as the END position.

Allows seeking back to "live" by using start_type:GST_SEEK_TYPE_END
and start:0

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