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Diffstat (limited to 'Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst index de43f5c8486d..71f23f131f97 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst @@ -72,3 +72,23 @@ Image Source Control IDs * - __u32 - ``height`` - Height of the area. + +``V4L2_CID_NOTIFY_GAINS (integer array)`` + The sensor is notified what gains will be applied to the different + colour channels by subsequent processing (such as by an ISP). The + sensor is merely informed of these values in case it performs + processing that requires them, but it does not apply them itself to + the output pixels. + + Currently it is defined only for Bayer sensors, and is an array + control taking 4 gain values, being the gains for each of the + Bayer channels. The gains are always in the order B, Gb, Gr and R, + irrespective of the exact Bayer order of the sensor itself. + + The use of an array allows this control to be extended to sensors + with, for example, non-Bayer CFAs (colour filter arrays). + + The units for the gain values are linear, with the default value + representing a gain of exactly 1.0. For example, if this default value + is reported as being (say) 128, then a value of 192 would represent + a gain of exactly 1.5. |