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[media] V4L: Add camera exposure metering control

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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>
This commit is contained in:
Sylwester Nawrocki 2012-04-30 04:34:10 -03:00 committed by Mauro Carvalho Chehab
parent 7f84ad8bdb
commit cf072139c7
3 changed files with 46 additions and 0 deletions
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29
Documentation/DocBook/media/v4l/controls.xml
View File

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

10
drivers/media/video/v4l2-ctrls.c
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@ -230,6 +230,12 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
"Aperture Priority Mode",
NULL
};
static const char * const camera_exposure_metering[] = {
"Average",
"Center Weighted",
"Spot",
NULL
};
static const char * const colorfx[] = {
"None",
"Black & White",
@ -434,6 +440,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
return camera_power_line_frequency;
case V4L2_CID_EXPOSURE_AUTO:
return camera_exposure_auto;
case V4L2_CID_EXPOSURE_METERING:
return camera_exposure_metering;
case V4L2_CID_COLORFX:
return colorfx;
case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
@ -632,6 +640,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
/* FM Radio Modulator control */
/* Keep the order of the 'case's the same as in videodev2.h! */
@ -783,6 +792,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
case V4L2_CID_ISO_SENSITIVITY_AUTO:
case V4L2_CID_EXPOSURE_METERING:
*type = V4L2_CTRL_TYPE_MENU;
break;
case V4L2_CID_LINK_FREQ:

7
include/linux/videodev2.h
View File

@ -1733,6 +1733,13 @@ enum v4l2_iso_sensitivity_auto_type {
V4L2_ISO_SENSITIVITY_AUTO = 1,
};
#define V4L2_CID_EXPOSURE_METERING (V4L2_CID_CAMERA_CLASS_BASE+25)
enum v4l2_exposure_metering {
V4L2_EXPOSURE_METERING_AVERAGE = 0,
V4L2_EXPOSURE_METERING_CENTER_WEIGHTED = 1,
V4L2_EXPOSURE_METERING_SPOT = 2,
};
/* FM Modulator class control IDs */
#define V4L2_CID_FM_TX_CLASS_BASE (V4L2_CTRL_CLASS_FM_TX | 0x900)
#define V4L2_CID_FM_TX_CLASS (V4L2_CTRL_CLASS_FM_TX | 1)