[Bug 725632] v4l2: Normalise control names in the same way as v4l2-ctl

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725632
  GStreamer | gst-plugins-good | 1.2.3

Nicolas Dufresne <nicolas.dufresne> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #13 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-03-09 00:40:57 UTC ---
Thanks

commit 4f47442c7f467a970e139871560af0ed4cb33ea0
Author: William Manley <will at williammanley.net>
Date:   Sat Mar 8 19:29:58 2014 -0500

    v4l2: Fix typo contol -> control

    https://bugzilla.gnome.org/show_bug.cgi?id=725632

commit d3bd3ecc3ebadf5f4871a34b9c268b1ac791cf06
Author: William Manley <will at williammanley.net>
Date:   Tue Mar 4 01:15:49 2014 +0000

    v4l2: Normalise control names in the same way as v4l2-ctl

    V4L2 kernel drivers allow configuration of the hardware settings via a
    mechanism called controls.  These can be referred to by name such as
    "Brightness" and "White Balance Temperature".  The user-space command line
    client for setting these controls (v4l2-ctl) normalises these names such
    that they only contain lower case alphanumeric characters and the
    underscore '_'.  e.g:

        Kernel                     v4l2-ctl
        ----------------------------------------------------
        Brightness                 brightness
        White Balance Temperature  white_balance_temperature
        Focus (absolute)           focus_absolute

    GStreamer seems to want to follow this pattern but failed for controls with
    more than one consecutive non-alphanum character.  e.g. GStreamer would
    produce "focus__absolute_" rather than "focus_absolute".

    This commit fixes that issue.  Backwards compatibility is preserved by
    normalising all control names before comparison.

    https://bugzilla.gnome.org/show_bug.cgi?id=725632

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