Hi,

On Thursday 02 September 2010 22:57:27 Palmax Maverick wrote:
> Dear Laurent and others linux-UVC developers,
> 
> I'm writting the messages of ctrl that will be based on yours. I'm
> trying to understand the meaning of the "probe" parameter of
> uvc_vide.c::uvc_get_video_ctrl
> 
> Could you tell me it please?

See section 4.3.1.1 in the UVC 1.1 specification.

> In addition, I want to know what is the value of bFormatIndex that It's the
> last selected. Have I to query it?

The current bFormatIndex value can be retrieved with a GET_CUR request on the 
video commit control.

> What is the meaning of dwMaxVideoFrameSize?

For frame-based formats (stream-based formats are not supported by the 
uvcvideo driver yet) the field stores the maximum size of a video frame.

> and dwMaxPayloadTransferSize at still image controls point of view?

It has the same meaning as for the video controls.

-- 
Regards,

Laurent Pinchart
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