From owner-freebsd-multimedia  Mon Jul 13 06:58:17 1998
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Date: Mon, 13 Jul 1998 14:57:47 +0100
From: Roger Hardiman <roger@cs.strath.ac.uk>
Organization: Strathclyde Uni
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To: freebsd-multimedia@FreeBSD.ORG, roger@cs.strath.ac.uk
Subject: New IOCTL for bt848 grab area (was S/W PAN and ZOOM)
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To all bt848 users.

Recently, I offered to write a new IOCTL which allowed you
to select the area from the video image to grab from.
This allows software Pan and Zoom.

Currently the driver takes the full NTSC (or PAL) image
of 640x480 and scales it down to fit the required size, eg
192x128.

With the new IOCTL, you specify an X and Y offset and an
X and Y image size.
This defined area (eg 320x256 - offset of 100,100) is then
captured instead of the full image.
The captured area is then scaled into the size required by
the application (eg 192x128).


For example, by changing the capture area from 
640x480, offset (0,0) to
320x240, offset (160,120)

I get a x2 zoom function without any sofware overhead.

The ioctl is passed a structure with the x and y offsets and sizes.


Cannot decide on a name though.
BT848 SET ACTIVE REGION
BT848 SET ACTIVE GEO
BT848 SET ACTIVE AREA

BT848 SET CROP REGION
BT848 SET CROP WINDOW
BT848 SET CROP AREA

BT848 SET CAP REGION
BT848 SET CAP WINDOW
BT848 SET CAP AREA

What do you lot perfer?

I'm sending the driver (which has changes to both the driver
and the two include files) to Amancio to place on his FTP site.


Cheers
Roger Hardiman
Strathclyde Uni Telepresence Group

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