[Bug 752718] New: dahsdemux: an incorrect index segment is downloaded

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752718

            Bug ID: 752718
           Summary: dahsdemux: an incorrect index segment is downloaded
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florin.apostol at oregan.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The gst_adaptive_demux_stream_download_header_fragment function is currently
downloading the index segment. The stream->fragment.index_uri was set by the
gst_dash_demux_stream_update_headers_info based on information supplied by
gst_mpd_client_get_next_header_index function. But this function is setting the
uri to initializationURL

*uri =
    g_strdup (gst_mpdparser_get_initializationURL (stream,
        stream->cur_segment_base->Initialization));

According to the standard, the description of indexRange at segmentBase is:
"specifies the byte range that contains the Segment Index in all Media Segments
of the Representation."
So the url it refers to should be the mediaURL, not the initializationURL. But
the mediaURL can differ for each media segment, so the approach to download a
single index segment in gst_adaptive_demux_stream_download_header_fragment is
wrong. 

See also https://bugzilla.gnome.org/show_bug.cgi?id=752714 for proposed changes
in handling segment index downloading.

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