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V4L/DVB: videodev2: introduce a common control for chroma gain 

Introduce a new control for modifying the chroma gain.  This allows for user
intervention in abnormal signal conditions cases where the decoder's chroma
AGC cannot compensate and the value needs to be adjusted manually.

This work was sponsored by EyeMagnet Limited.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2010-03-11 21:27:59 -03:00 committed by Mauro Carvalho Chehab
parent fea551fae9
commit 7a01f6dbc7
2 changed files with 10 additions and 1 deletions
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6
Documentation/DocBook/v4l/controls.xml
View File

@ -266,6 +266,12 @@ minimum value disables backlight compensation.</entry>
<entry>boolean</entry>
<entry>Chroma automatic gain control.</entry>
</row>
<row>
<entry><constant>V4L2_CID_CHROMA_GAIN</constant></entry>
<entry>integer</entry>
<entry>Adjusts the Chroma gain control (for use when chroma AGC
is disabled).</entry>
</row>
<row>
<entry><constant>V4L2_CID_COLOR_KILLER</constant></entry>
<entry>boolean</entry>

5
include/linux/videodev2.h
View File

@ -1030,8 +1030,11 @@ enum v4l2_colorfx {
#define V4L2_CID_ROTATE (V4L2_CID_BASE+34)
#define V4L2_CID_BG_COLOR (V4L2_CID_BASE+35)
#define V4L2_CID_CHROMA_GAIN (V4L2_CID_BASE+36)
/* last CID + 1 */
#define V4L2_CID_LASTP1 (V4L2_CID_BASE+36)
#define V4L2_CID_LASTP1 (V4L2_CID_BASE+37)
/* MPEG-class control IDs defined by V4L2 */
#define V4L2_CID_MPEG_BASE (V4L2_CTRL_CLASS_MPEG | 0x900)