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[media] V4L: Add an extended camera white balance control

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This patch adds V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE control which is
an extended version of the V4L2_CID_AUTO_WHITE_BALANCE control,
including white balance presets. The following presets are defined:

 - V4L2_WHITE_BALANCE_INCANDESCENT,
 - V4L2_WHITE_BALANCE_FLUORESCENT,
 - V4L2_WHITE_BALANCE_FLUORESCENT_H,
 - V4L2_WHITE_BALANCE_HORIZON,
 - V4L2_WHITE_BALANCE_DAYLIGHT,
 - V4L2_WHITE_BALANCE_FLASH,
 - V4L2_WHITE_BALANCE_CLOUDY,
 - V4L2_WHITE_BALANCE_SHADE.

Signed-off-by: HeungJun Kim <riverful.kim@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki
2012-03-06 07:04:26 -03:00
committed by Mauro Carvalho Chehab
parent d58083c949
commit e40a05736d
3 changed files with 101 additions and 0 deletions
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70
Documentation/DocBook/media/v4l/controls.xml
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@@ -3022,6 +3022,76 @@ camera sensor on or off, or specify its strength. Such band-stop filters can
be used, for example, to filter out the fluorescent light component.</entry>
</row>
<row><entry></entry></row>
<row id="v4l2-auto-n-preset-white-balance">
<entry spanname="id"><constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant>&nbsp;</entry>
<entry>enum&nbsp;v4l2_auto_n_preset_white_balance</entry>
</row><row><entry spanname="descr">Sets white balance to automatic,
manual or a preset. The presets determine color temperature of the light as
a hint to the camera for white balance adjustments resulting in most accurate
color representation. The following white balance presets are listed in order
of increasing color temperature.</entry>
</row>
<row>
<entrytbl spanname="descr" cols="2">
<tbody valign="top">
<row>
<entry><constant>V4L2_WHITE_BALANCE_MANUAL</constant>&nbsp;</entry>
<entry>Manual white balance.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_AUTO</constant>&nbsp;</entry>
<entry>Automatic white balance adjustments.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant>&nbsp;</entry>
<entry>White balance setting for incandescent (tungsten) lighting.
It generally cools down the colors and corresponds approximately to 2500...3500 K
color temperature range.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant>&nbsp;</entry>
<entry>White balance preset for fluorescent lighting.
It corresponds approximately to 4000...5000 K color temperature.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant>&nbsp;</entry>
<entry>With this setting the camera will compensate for
fluorescent H lighting.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_HORIZON</constant>&nbsp;</entry>
<entry>White balance setting for horizon daylight.
It corresponds approximately to 5000 K color temperature.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_DAYLIGHT</constant>&nbsp;</entry>
<entry>White balance preset for daylight (with clear sky).
It corresponds approximately to 5000...6500 K color temperature.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_FLASH</constant>&nbsp;</entry>
<entry>With this setting the camera will compensate for the flash
light. It slightly warms up the colors and corresponds roughly to 5000...5500 K
color temperature.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_CLOUDY</constant>&nbsp;</entry>
<entry>White balance preset for moderately overcast sky.
This option corresponds approximately to 6500...8000 K color temperature
range.</entry>
</row>
<row>
<entry><constant>V4L2_WHITE_BALANCE_SHADE</constant>&nbsp;</entry>
<entry>White balance preset for shade or heavily overcast
sky. It corresponds approximately to 9000...10000 K color temperature.
</entry>
</row>
</tbody>
</entrytbl>
</row>
<row><entry></entry></row>
</tbody>
</tgroup>
</table>