Primary Surface Mode Of Operation - Hauppauge WinTV Installation And Reference Manual

WinTV
Installation and Reference Manual
ously overlay the VGA screen with the video image. Using Video
Overlay, the VGA controller treats the live TV image just like any other
window, which results in a 24-bit video image on your VGA screen. You
will also be able to display full screen TV at all VGA resolutions.

Primary Surface mode of operation

If your VGA display adapter but does not have either a Video Port or
enough memory to hold the video image off-screen, then the WinTV
board converts the YUV 4:2:2 video pixels into an RGB format which is
compatible with your VGA display adapter's operating mode (8 bits per
pixel, 16 bits per pixel or 24-bits per pixel), and then moves the pixels
directly into the display memory or Primary Surface of your VGA.
This results in a high quality video image whose color depth is depen-
dent upon your VGA display adapter's operating mode. For example,
your TV image when running in a 256 color mode will not be as good as
when running your VGA in 16-bit per pixel mode.
Also, because the video is moved directly onto the Primary Surface, fea-
tures such as close captioning and full-screen TV in resolutions greater
than 640x480 will be disabled.
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