Hardware assist for YUV data format conversion to software MPEG decoder
US6005546A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1996 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Mar 21, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display controller assists a host processor in decoding MPEG data. The display controller receives YUV data in non-pixel video format from a host CPU and perform the otherwise CPU intensive task of rasterization within the display controller. In addition, the display controller may use its internal BITBLIT engine to copy U and V data from one line in a BITBLIT operation to adjacent lines, so as to replicate U and V data. A byte mask preserves Y data on the adjacent lines from being overwritten. At the end of the BITBLIT operation, the display controller generates a signal indicating that the frame buffer has been filled with new data, and thus display controller automatically switches to reading from the newly written frame buffer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.