[Bug 797016] New: Appsink: does not respect allocation query being serialized

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797016

            Bug ID: 797016
           Summary: Appsink: does not respect allocation query being
                    serialized
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: patcherwork at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 373433
  --> https://bugzilla.gnome.org/attachment.cgi?id=373433&action=edit
Demo of how allocation query handing is not being respected

The allocation query is serialized, which means that it should respect the flow
of data and follow after all buffers that have come before it. However, appsink
does not respect this. I have added a demo showing how this behavior breaks
v4l2src functionality. I have also added a simple patch for fixing the issue,
by calling the same code that GST_QUERY_DRAIN runs.

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