[Linux-uvc-devel] [SVN] Added preliminary pan/tilt support for Quickcam Orbit MP

[Laurent P. <lau...@sk...>]

Hi everybody,

thanks to Logitech that sent a Quickcam Orbit MP, you can find a preliminary 
pan/tilt support in the latest SVN release. Preliminary means that pan/tilt 
works as expected, but the interface will change in the near future as I 
rewrite the UVC controls handling code.

As this is a brand new feature, you probably won't find any application 
supporting it yet. For those of you who would like to play with pan/tilt, 
here's the API.

Pan/tilt is currently implemented with the following controls (refer to the 
V4L2 API for details regarding how to use VIDIOC_S_CTRL) :

- V4L2_CID_PANTILT_RELATIVE (V4L2_CID_PRIVATE_BASE+7) commands the pan/tilt 
motion. The argument is a 4 bytes array formatted as a 32 bits number.

Offset	Field		Size	Value		Description
-----------------------------------------------------------------------------
0	wPanRelative	2	Signed Number	Pan relative rotation
2	wTiltRelative	2	SignedNumber	Tilt relative rotation


- V4L2_CID_PANTILT_RESET (V4L2_CID_PRIVATE_BASE+8) resets pan/tilt to their 
default value. The argument is a bit field formatted as a 32 bits number.

Offset	Field		Size	Value		Description
-----------------------------------------------------------------------------
0	bReset		1	Number		D0: 	0 No action
							1 Reset Pan position
						D1: 	0 No action
							1 Reset Tilt position
						D2..D7: Not used (set to 0)

The interface *will* change in a future release, but in the meantime you can 
start implementing a motion-tracking algorithm :-)

Laurent Pinchart