[Bug 725835] New: v4l2sink: Use GstVideoCropMeta to set overlay window if available

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725835
  GStreamer | gst-plugins-good | git

           Summary: v4l2sink: Use GstVideoCropMeta to set overlay window
                    if available
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: aurelien.zanelli at parrot.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=271119)
 View: https://bugzilla.gnome.org/attachment.cgi?id=271119
 Review: https://bugzilla.gnome.org/review?bug=725835&attachment=271119

v4l2sink: Use GstVideoCropMeta to set overlay window if available

An upstream element could provide buffers with GstVideoCropMeta to v4l2sink.
The main idea of the attached patch is to update the V4L2 overlay window
according to incoming GstVideoCropMeta (if available) when rendering frames.
However, current implementation of this will override any overlay rectangle set
by set_property() method. Maybe it should be property first then
GstVideoCropMeta.


More background:
Our H264 decoder output non-cropped frames with a definition multiple of 16,
which is the h264 macroblock size.
When input video definition is not a multiple of 16, encoding/decoding process
add padding and provide crop information.
Since our gst pipeline is decoder --> v4l2sink, we want to let the cropping job
to the v4l2 device. So decoder send cropping info through GstVideoCropMeta and
v4l2sink set overlay window accordingly.

Current patch apply on master and 1.2.3, however i only tested it on 1.2.3

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