[Bug 788417] New: hls: Fix media sequence handling when encountering loops

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788417

            Bug ID: 788417
           Summary: hls: Fix media sequence handling when encountering
                    loops
    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: jan.steffens at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Don't try to match URIs when we have media sequences. It is legal
for a stream to reuse segments (marking discontinuities as needed).
Uplynk delivers such playlists for their placeholder loops.

Leave the URI scanning in place for playlists which have no
EXT-X-MEDIA-SEQUENCE tag. This should be harmless since the spec
requires these playlists to not be missing segments (RFC8216 6.2.2),
so we should be always matching on the first segment.

Also do a bunch of refactoring. Patches follow.

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