[Bug 758952] New: dashdemux: forward availabilityStartTime to application

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758952

            Bug ID: 758952
           Summary: dashdemux: forward availabilityStartTime to
                    application
    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: julien.isorce at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The application needs a way to retrieve the "availabilityStartTime" field in
mpd.

Indeed getStartDate method of HTML5 video tag shall return
MPD at availabilityStartTime plus the PeriodStart time.

PeriodStart seems to be gst_adaptive_demux_get_period_start_time which should
match start attribute in mpd, example: <Period .. start="PT0.00S">

One possible solution is to post a gst message. Should I add a new entry to
GST_ADAPTIVE_DEMUX_STATISTICS_MESSAGE_NAME message: "start-date" ? Or a new
message specific to dash where we can add as much as mpd's nodes/attributes
that we need ?

(Currently with latest WebKit getStartDate always returns NaN since it is
default implementation)

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