[Bug 752962] New: v4l2videodec: Add resolution change stream support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752962

            Bug ID: 752962
           Summary: v4l2videodec: Add resolution change stream support
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: kevinbing.song at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I am implementing v4l2videodec video decoder support resolution change stream.
The changes is list below. Please help to review. Will upload patch later. We
also developing video decoder based on V4L2 M2M. I verify below on our video
decoder.

1. Should subscribe V4L2_EVENT_EOS and V4L2_EVENT_SOURCE_CHANGE event for V4L2
video decoder.
2. Capture port should get the video format after got V4L2_EVENT_SOURCE_CHANGE.
So capture buffer pool should activated in gst_v4l2_video_dec_loop ().
3. dqevent () will blocked until got one V4L2 event.
4. Will call dqevent () when got one zero size video frame buffer. and check
the event, the event will be EOS event or SOURCE_CHANGE event.
5. Will gst_v4l2_object_stop () capture object if received SOURCE_CHANGE event,
and active it again after get right video format.

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