Method and apparatus for decoding for AVS system using fetching flag

摘要

A decoding method for an audio video coding standard (AVS) system is provided. According to a stop-fetching criterion, a stop-fetching flag is set to an enabled status or a disabled status. In an offset fetching procedure, it is determined whether an offset value is smaller than a threshold and whether the stop-fetching is in the disabled status. When a determination result is affirmative, one subsequent bit is fetched for the offset value, an offset shift value is correspondingly increased, and the determination step is iterated. When the determination result is negative, the offset fetching procedure is terminated. Next, it is determined whether a decoding result is a least probable symbol (LPS) or a most probable symbol (MPS).

主权项

1. A decoding method for an audio video coding standard (AVS) system, for decoding encoded audio/video data, decoding method comprising:
a) setting a stop-fetching flag to an enabled status or a disabled status according to at least one stop-fetching criterion, wherein the at least one stop-fetching criterion comprises: setting the stop-fetching flag to the disabled status when a remaining shift value obtained by subtracting a range shift value from the offset shift value is smaller than an upper limit of the remaining shift value; and setting the stop-fetching flag to the enabled status when the remaining shift value is greater than or equal to the upper limit of the remaining shift value; b) in an offset fetching procedure, determining whether a valid offset value is smaller than a threshold and whether the stop-fetching flag is in the disabled status; c) when a determination result of step (b) is affirmative, fetching a subsequent bit for the valid offset value, correspondingly increasing an offset shift value, and iterating step (b); d) when the determination result of step (b) is negative, terminating the offset fetching procedure; and e) after the offset fetching procedure is terminated, determining whether a decoding result is a least probable symbol (LPS) or a most probable symbol (MPS).