Method and apparatus to facilitate the efficient implementation of trick modes in a personal video recording system

摘要

A method and apparatus are disclosed for facilitating efficient operation of trick modes in a personal video recording (PVR) system. Stream-navigation data from a data stream is captured and pre-processed to generate a frame-correlated NAV table comprising one entry for each frame within the data stream, during recording of the data stream. The stream-navigation data comprises start code data, content rating data, and conditional access data that is embedded in the data stream. During playback of the data stream in a user-selected trick mode, the frame-correlated NAV table is used to generate command packets that are sent to a data decoder along with selected frames of the data stream. The selected frames are decoded based on information in the command packets and certain selected frames may be displayed as part of the trick mode.

主权项

1. A method to facilitate efficient operation of trick modes in a personal video recording (PVR) system recording a data stream, said method comprising:
capturing stream navigation data from said data stream during said recording; generating calculated navigation data from said stream navigation data during said recording; and generating at least one frame-correlated navigation table with one entry for each frame of said data stream, from at least one of said stream navigation data and said calculated navigation data during said recording, wherein said stream navigation data comprises at least one of content rating data and conditional access data.