Optimal buffering and scheduling strategy for smooth reverse in a DVD player or the like
US7974523B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 2004 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Jun 4, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8042
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The optimal buffering strategy of the present invention allows for full smooth reverse functionality in an MPEG-type stream player, while reducing the buffering requirements. Furthermore, the buffering strategy drastically reduces the required number of passes through the video data unit by optimal scheduling of picture decodes. A video data unit buffering strategy for smooth reverse includes the following operations. First, a video data unit is scanned before decoding any pictures within the video data unit. Positions of each picture are then marked out in the video data unit. Next, the entire video data unit is decoded, except the open GOP pictures which need a reference picture from an adjacent video data unit. The open GOP pictures are then copied to the end of the current video data unit in the buffer, and the new video data unit continues to be fetched.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.