| 摘要 |
<p>An outgoing video stream is produced in a plurality of video modes, including a live play mode in which an input task ( 20 ) is coupled to a decoding task ( 22 ), a pause mode in which the input task ( 20 ) is coupled to a recording task ( 24 ), and a time-shift mode in which the input task ( 20 ) is coupled to the recording task ( 24 ) and a replay task ( 26 ) is coupled to the decoding task ( 22 ). In different modes, different subsets of the tasks ( 20, 22, 24, 26 ) or all of the tasks ( 20, 22, 24, 26 ) are active. FIFO communication buffers ( 16 a-d) are used to communicate between the tasks ( 20, 22, 24, 26 ). Switching between the video modes is realized by reassigning connections of tasks ( 20, 22, 24, 26 ) to respective ones of the communication buffers ( 16 a-d), keeping previous data in the reassigned FIFO communication buffers ( 16 a-d). Tasks ( 20, 22, 24, 26 ) that are needed before and after a switch are kept continuously active, so that they continue to read from or write to the FIFO communication buffers ( 16 a-d) to which they are connected. Reassignment of connections to communication buffers ( 16 a-d) is preferably limited to points of time at transitions between transfer of closed Groups Of Pictures in die video streams.</p> |
