[media] V4L: Add camera exposure metering control
The V4L2_CID_EXPOSURE_METERING control allows to determine a method used by the camera for measuring the amount of light available for automatic exposure. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Mauro Carvalho Chehab

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@@ -2864,6 +2864,35 @@ exposure time and/or aperture.</para></entry>
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</row>
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<row><entry></entry></row>
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<row id="v4l2-exposure-metering">
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<entry spanname="id"><constant>V4L2_CID_EXPOSURE_METERING</constant> </entry>
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<entry>enum v4l2_exposure_metering</entry>
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</row><row><entry spanname="descr">Determines how the camera measures
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the amount of light available for the frame exposure. Possible values are:</entry>
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</row>
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<row>
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<entrytbl spanname="descr" cols="2">
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_EXPOSURE_METERING_AVERAGE</constant> </entry>
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<entry>Use the light information coming from the entire frame
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and average giving no weighting to any particular portion of the metered area.
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</entry>
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</row>
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<row>
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<entry><constant>V4L2_EXPOSURE_METERING_CENTER_WEIGHTED</constant> </entry>
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<entry>Average the light information coming from the entire frame
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giving priority to the center of the metered area.</entry>
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</row>
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<row>
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<entry><constant>V4L2_EXPOSURE_METERING_SPOT</constant> </entry>
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<entry>Measure only very small area at the center of the frame.</entry>
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</row>
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</tbody>
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</entrytbl>
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</row>
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<row><entry></entry></row>
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<row>
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<entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant> </entry>
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<entry>integer</entry>
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