diff options
| -rw-r--r-- | Documentation/DocBook/media/v4l/controls.xml | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index cc0087efc8d2..74f575560f1b 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -408,14 +408,17 @@ to work.</entry> <row id="v4l2-alpha-component"> <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry> <entry>integer</entry> - <entry> Sets the alpha color component on the capture device or on - the capture buffer queue of a mem-to-mem device. When a mem-to-mem - device produces frame format that includes an alpha component + <entry>Sets the alpha color component. When a capture device (or + capture queue of a mem-to-mem device) produces a frame format that + includes an alpha component (e.g. <link linkend="rgb-formats">packed RGB image formats</link>) - and the alpha value is not defined by the mem-to-mem input data - this control lets you select the alpha component value of all - pixels. It is applicable to any pixel format that contains an alpha - component. + and the alpha value is not defined by the device or the mem-to-mem + input data this control lets you select the alpha component value of + all pixels. When an output device (or output queue of a mem-to-mem + device) consumes a frame format that doesn't include an alpha + component and the device supports alpha channel processing this + control lets you set the alpha component value of all pixels for + further processing in the device. </entry> </row> <row> |