[Bug 787820] New: glvideomixer: need update output geo after src caps reconfigure

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787820

            Bug ID: 787820
           Summary: glvideomixer: need update output geo after src caps
                    reconfigure
    Classification: Platform
           Product: GStreamer
           Version: 1.12.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jared.hu at nxp.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

We need reconfigure output geometry when sink caps changed which will occurs
once fixate_caps. When do aggregating, check if we have reconfigured src caps.
In addition, fixate_caps cannot use gst_structure_fixate_field_nearest_* to
update caps because when structure is fixed, it just return false instead
updating the value.

code in gst/gststructure.c

2174   if (G_VALUE_TYPE (value) == G_TYPE_INT) {                                
2175     /* already fixed */                                                    
2176     return FALSE;

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