[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

Will Manley <gnome> changed:

           What    |Removed                     |Added
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 Attachment #270862|0                           |1
        is obsolete|                            |

--- Comment #10 from Will Manley <gnome at williammanley.net> 2014-03-07 17:56:37 UTC ---
Created an attachment (id=271257)
 View: https://bugzilla.gnome.org/attachment.cgi?id=271257
 Review: https://bugzilla.gnome.org/review?bug=725632&attachment=271257

Patch including backwards compatibility

Uploading new patch.  Allows setting "exposure__auto" but emits the warning:

WARNING **: In GStreamer 1.4 the way V4L2 control names were normalised
changed.  Instead of setting "exposure__auto" please use "exposure_auto".  The
former is deprecated and will be removed in a future version of GStreamer

I'm not 100% happy with the patch as you could even use the key "Exposure,
Auto" and it would still work.  e.g. it is *much* more liberal in what it
accepts which may make it difficult to remove in the future.

What do you think?

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