1
UG848_3A
Brooktree
®
Bt848 Software Specification
Overview
Intended Audience
The Bt848 Software Driver Guide is intended for an audience with an understanding of software
driver programming. It is assumed that the reader is familiar with and has access to the appropriate
documentation for: Microsoft
®
Windows95™, Video for Windows™, and Direct Draw Interface™.
Driver Software Specification
The Bt848 driver software provides high-level control of the device functions. It provides an inter-
face to Microsoft Video for Windows (VfW) for video capture and video-in-a-window support, and
uses the Microsoft Direct Draw Interface (DDI), to write video data directly to the graphics frame
buffer.
The Bt848 driver software features:
•
Windows 95 compatibility
•
High level control of Bt848 video decoder functions
•
Video Capture support
•
Video-in-a-window support
•
Vertical Blanking Interval (VBI) data support
•
Closed-caption support
•
Teletext support
•
I
2
C function support
•
GPIO function support
•
Intelligent error recovery
•
Microsoft Setup installation script
•
Customer modifiable dialog boxes in Dialog Dynamic Link Library (DLL)
Target Platform
The Bt848 driver software is intended for Pentium™ 90 MHz PCI systems with the Microsoft
Windows95 operating system. The graphics sub-system must have a linear frame buffer and a DDI
provider for video in a window support.
