MPEG Decoder Interface

[This is preliminary documentation and subject to change.]

The interface between the video card for the MPEG decoder and the computer must have the following features:

• Conformation to the Plug and Play specification as a PCI multiple-function device, providing separate spaces for super Video Graphics Array (SVGA), MPEG, and tuner functions
• PCI bus mastering of audio and video MPEG data
• Support for unaligned, odd byte transfers and scatter/gather memory access
• Data buffering control, and provision of status information about data buffering
• MPEG video decoding control, and provision of status information about MPEG video decoding
• MPEG audio decoding control, and provision of status information about MPEG audio decoding
• Cable television tuner control, and provision of status information about the cable television tuner
• Control of and provision of status information about base-band video encoding and decoding
• Control of and provision of status information about audio and video signal paths
• Closed captioning input and output to audio and video signal paths