| 摘要 |
<p>A method for providing instant replay is disclosed. According to the method, a video stream and an audio stream are received from a source. A program is rendered from the video and audio streams and played in real time. The video stream and the audio stream are compressed using a video compression engine and an audio compression engine respectively. Information relating to the compressed video and audio streams and the video and audio compression engines is stored in a sequence header. The compressed video and audio streams are multiplexed to form a single data stream. The information relating to video and audio frames including synchronization information is stored in a multiplexer header. Media units are formed from the multiplexed data stream. Each media unit includes at least one video frame and at least one or more corresponding audio frames. Each media unit further includes a first video frame that is independently decodable. Each media unit is an independently decodable entity. The media units have a fixed duration. The media units are stored in a memory. A number of starting addresses are stored in a table. Each of the starting addresses corresponds to one of the media units. The sequence header is retrieved in response to receipt of an instant replay command. Appropriate video and audio decompression engines are selected and configured based on the retrieved sequence header. An instant replay starting address is identified from the table in response to receipt of the instant replay command. One or more media units are retrieved from the memory starting with the media unit associated with the instant replay starting address. The one or more retrieved media units are demultiplexed into compressed video and audio data for respective delivery to the video and audio decompression engines. The decompressed data are then rendered.</p> |
