[Bug 754042] New: v4l2src: Asserts on renegotiation with USERPTR

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754042

            Bug ID: 754042
           Summary: v4l2src: Asserts on renegotiation with USERPTR
    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: nicolas.dufresne at collabora.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

With memory model USERPTR, renegotiation lead to assertion as the code expect
the downstream pool to be deactivated after the pipeline get drained using the
allocation query. Arguably, this code should be more robust.

gst-launch-1.0 v4l2src io-mode=userptr ! glimagesink

Result is:
** (gst-launch-1.0:8898): CRITICAL **: gst_v4l2_buffer_pool_set_other_pool:
assertion '!gst_buffer_pool_is_active (GST_BUFFER_POOL (pool))' failed


This only occurs with glimagesink and gtkglsink, which sends reconfigure when
the display size changes.

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