1. An apparatus used in video encoding comprising: a processor configured to: generate a prediction block for a current block; compute a difference between the current block and the prediction block to generate a residual block, wherein the residual block comprises a plurality of residual values; and if the plurality of residual values include at least one non-zero residual value comprising at least one sign and at least one residual level, perform entropy encoding on the at least one sign; and perform entropy encoding on the at least one residual level, wherein one non-zero residual value comprises one sign and one residual level.