[Bug 752413] dashdemux: add support for parsing UTCTiming elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752413

A Ashley <bugzilla at ashley-family.net> changed:

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 Attachment #307466|0                           |1
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--- Comment #2 from A Ashley <bugzilla at ashley-family.net> ---
Created attachment 308087
  --> https://bugzilla.gnome.org/attachment.cgi?id=308087&action=edit
dashdemux: add support for UTCTiming elements for clock drift compensation

This patch provides parsing of UTCTiming elements, unit tests of this parsing
and a task to poll the server every 30 minutes. This task supports the
"urn:mpeg:dash:utc:http-xsdate:2014" and "urn:mpeg:dash:utc:http-iso:2014"
methods.

When choosing the starting fragment number and when waiting for a fragment to
become available, the difference between the server's idea of UTC and the
client's idea of UTC is taken into account. For example, if the server's time
is behind the client's idea of UTC, adaptivedemux waits longer before
requesting a fragment.

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