[Bug 701191] New: rtsp-media: UTC ranges difficult to handle in element seeks

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701191
  GStreamer | gst-rtsp-server | git

           Summary: rtsp-media: UTC ranges difficult to handle in element
                    seeks
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-rtsp-server
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: davidsf at axis.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=245546)
 View: https://bugzilla.gnome.org/attachment.cgi?id=245546
 Review: https://bugzilla.gnome.org/review?bug=701191&attachment=245546

media: possibility to override range time conversion

In gst_rtsp_media_seek, gst_rtsp_range_get_times is used for converting a
GstRTSPTimeRange to GstClockTimes before seeking on the media pipeline.

We have experienced problems with this for UTC ranges. For such ranges,
gst_rtsp_range_get_times gives GstClockTimes that are nanoseconds since 1900.
Such times are not meaningful in the element in the pipeline that handles our
seeks. It is not clear to us how the seek function in the element could
distinguish between such times and the times for other types of ranges, such as
NPT. NPT ranges result in seeks between "normal" times such as
0:00:02.000000000 and 0:00:04.000000000.

Our suggestion, in the attached patch, is to make it possible to override a
method in GstRTSPMedia where the GstRTSPTimeRange is converted to
GstClockTimes. In our GstRTSPMedia subclass, we would use knowledge about UTC
times of the start and end of the media for computing useful GstClockTimes.

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