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Get The Picture. Microsoft breaks down its APIs into receiving APIs and rendering APIs. Receiving APIs accept and decode the video and sound while rendering APIs draw the video frames on your display.
The two most important APIs on the receiving end include BDA (Broadcast Driver Architecture) and DirectX VA (Video Accelerator). If the hardware can't describe the image it's receiving in terms the OS (operating system) can understand, the whole system breaks down before it even gets started. Software known as a driver helps the hardware communicate with the OS. BDA provides a number of components manufacturers can use to ease driver development. Support for digital, analog, and streaming media are provided by the BDA. BDA components are also compatible with the proper APIs.
Once the signal has been received, the PC needs to decode it. Without the use of special hardware, the system's processor would have to decode the signal. This naturally causes a reduction in system performance. The solution is to use special hardware dedicated to decoding broadcast signals. Microsoft's DirectX VA sets the framework for using hardware acceleration. Although vendors can
The ViewSonic VPW500 Plasma display (right) features the 16:9 aspect ratio some DTV (digital television) formats use, while the ViewSonic E771 uses the more traditional 4:3 aspect ratio currently seen in analog sets.
write their own hardware, third-party software can take advantage of the video acceleration hardware using DirectX VA
