[Bug 791347] New: interaudio: Fix undefined DTS

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791347

            Bug ID: 791347
           Summary: interaudio: Fix undefined DTS
    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: dv at pseudoterminal.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently, interaudiosrc does not set the DTS value, only the PTS one. This can
cause basesrc to produce incorrect buffer timestamps.

This is because basesrc performs this check:

  if (GST_CLOCK_TIME_IS_VALID (dts))
    timestamp = dts;
  else
    timestamp = pts;

So, if the undefined DTS value happens to be anything other than ((guint64)-1),
basesrc ends up using the undefined DTS value instead of the defined PTS one
for
the outgoing buffers.

Fix this by explicitely setting DTS to GST_CLOCK_TIME_NONE.

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