[Bug 736926] New: dshowvideosrc: error if set_caps is called while running

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736926
  GStreamer | gst-plugins-bad | git

           Summary: dshowvideosrc: error if set_caps is called while
                    running
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: oss at nvl.army.mil
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=286533)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=286533)
suggested patch to allow set_caps to be called multiple times

I have a pipeline using dshowvideosrc which calls set_caps while it is already
running, resulting in the error "At least one of the pins involved in the
operation is already connected", VFW_E_ALREADY_CONNECTED. So it seems simply
calling media_filter->Stop() is not enough. This patch checks if the new caps
are the same, returning immediately, otherwise it disconnects the pins before
reconnecting. Not sure if it's better to reconfigure the existing connection,
or if that's even possible.

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