[Bug 797045] New: glbasefilter: Add proper support for in-place transform

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797045

            Bug ID: 797045
           Summary: glbasefilter: Add proper support for in-place
                    transform
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

In 1.15 we introduced gst_gl_base_filter_find_gl_context(), which let base
subclass trigger the query for a context, and will call gl_stop/gl_start,
though using this is a bit difficult, and still requires a lot of work when a
filter sets base transform to in-place mode.

We should detect that the transform is in-place and trigger the calls to
gl_start/gl_stop/gl_setcaps() at appropriate places. This is not triggered
because there is no decide_allocation() in that mode.

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