[Bug 783547] New: dashdemux: add support for EssentialProperty and SupplementalProperty elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783547

            Bug ID: 783547
           Summary: dashdemux: add support for EssentialProperty and
                    SupplementalProperty elements
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla at ashley-family.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The EssentialProperty and SupplementalProperty elements are used to signal
information about an AdaptationSet, a Representation or a SubRepresentation.

SupplementalProperty elements provide additional information about an
AdaptationSet, Representation or SubRepresentation. A DASH client can ignore
any SupplementalProperty that it does not recognise.

EssentialProperty elements provide additional information about an
AdaptationSet, Representation or SubRepresentation. A DASH client must skip any
AdaptationSet, Representation or SubRepresentation that contains an
EssentialProperty that it does not recognise.

According to the DASH specification, if EssentialProperty elements share the
same id, processing any one of the EssentialProperty elements with the same
value for id is sufficient.

Wojciech Przybyl provided a partial implementation of EssentialProperty
elements in Bug 777441, however it did not provide support for attributes
within these elements and does not include the logic around the id attribute.

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