Video playback method and apparatus
US7463819B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2004 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Sep 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video playback circuit receives flip call information and vertical synchronization information, and in response determines a pause mode and a playback mode. Flip call information, as is known in the art, provides an indication for flipping between a front buffer and a back buffer, in order to facilitate rendering into one buffer while rasterizing out of the other buffer. Vertical synchronization information describes the completion of rasterizing an image onto a display, and often occurs at periodic intervals, e.g., 60 Hz, 100 Hz. The video playback circuit further includes a pause/playback-based frame buffer pointer information generator. The pause/playback-based frame buffer pointer information generator generates unfiltered frame buffer pointer information when in the pause mode. Otherwise, the pause/playback-based frame buffer pointer information generator generates filtered frame buffer pointer information when in the playback mode. The unfiltered frame buffer pointer information indicates rasterization of unfiltered rasterization data from the frame buffer during the pause mode. Similarly, the filtered frame buffer pointer information indicates rasterization of filtered ras…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.