[Bug 701540] New: v4l2: iterate controls with V4L2_CTRL_FLAG_NEXT_CTRL

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701540
  GStreamer | gst-plugins-good | git

           Summary: v4l2: iterate controls with V4L2_CTRL_FLAG_NEXT_CTRL
    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: m.olbrich at pengutronix.de
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=245933)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=245933)
patch

In v2.6.18 control classes where added to the v4l2 API.
Iterating over CIDs starting with V4L2_CID_BASE will only find controls for
the first control class.
By iterating with V4L2_CTRL_FLAG_NEXT_CTRL all controls are found.

This is necessary to make controls from other control classes available in
the extra-controls property.

What's the policy on backwards compatibility here? V4L2_CTRL_FLAG_NEXT_CTRL was
introduced in v2.6.18. Is this ok, or should I keep the old code as fallback if
V4L2_CTRL_FLAG_NEXT_CTRL is not available?

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