[Bug 720103] New: videodecoder: Introduce sink_query/src_query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720103
  GStreamer | gst-plugins-base | git

           Summary: videodecoder: Introduce sink_query/src_query
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=263813)
 View: https://bugzilla.gnome.org/attachment.cgi?id=263813
 Review: https://bugzilla.gnome.org/review?bug=720103&attachment=263813

Add src_query() sink_query() virtual method

I am implementing a V4L2 based decoder which has dynamic capabilities. This
mean, i need to implement caps query. I had the option to add a
src_get_caps()/sink_get_caps() but thought this is a rare case, and it's simply
more generic to have access to all queries, like we do for event.

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