TIMESTAMP CONVERSION

摘要

A target time stamp on a target time-base is obtained from a originating time stamp on an originating time-base of an audio video transport system by first taking samples simultaneously from transport streams having the originating time-base and target timebase, respectively. A current sample and an immediately preceding sample for the originating time-base and target time-base are stored, respectively. A first difference is determined between the current sample and an immediately preceding sample for the originating time-base and a second difference is determined between the current sample and an immediately preceding sample for the target time-base, respectively. The first difference is added to the current sample of the originating time base and the second difference is added to the current sample of the target time-base if the current sample is less than the originating time-stamp and the first difference is subtracted from the current sample of the originating time base and the second difference is subtracted from the current sample of the target time-base if the current sample is greater than the originating timestamp. The first difference and the second difference are halved and the addition or subtraction and halving iterated until the first difference or the second difference is negligibly small. The iterated current sample of the target time-base is output as the target time-stamp.