[Bug 768195] New: v4l2: Add support for device capability

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768195

            Bug ID: 768195
           Summary: v4l2: Add support for device capability
    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 at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

At some point in time (v4l2 in gst is very old) the capability structure in
V4L2 was extended in a way it broke the ABI. A driver now uses the
v4l2_capability::capabilities as the intersection of all capabilities by adding
V4L2_CAP_DEVICE_CAPS flags there. In GStreamer, when this flag is present, we
always want to look at the v4l2_capability::device_caps. A suggestion while
porting would be to check if this flags is present, if not, copy the
capabilities into device_caps. And then, everywhere in the code, replace
capabilities with device_caps.

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