7. A method for encoding video data, the method comprising: partitioning a coding unit (CU) in a B slice into one or more prediction units (PUs); and for at least one of the PUs of the CU: determining, based on a size characteristic of the PU, that the PU is restricted to uni-directional inter prediction; and signaling, in a bitstream, an inter prediction mode indicator for the PU, wherein when the PU is restricted to uni-directional inter prediction, the inter prediction mode indicator is able to indicate that the PU is either uni-directionally inter predicted based on a list 0 or uni-directionally inter predicted based on a list 1 , wherein when the PU is not restricted to uni-directional inter prediction, the inter prediction mode indicator is able to indicate the PU is either uni-directionally inter predicted based on the list 0 , uni-directionally inter predicted based on the list 1 , or bi-directionally predicted.
7. A method for encoding video data, the method comprising: partitioning a coding unit (CU) in a B slice into one or more prediction units (PUs); and for at least one of the PUs of the CU: determining, based on a size characteristic of the PU, that the PU is restricted to uni-directional inter prediction; and signaling, in a bitstream, an inter prediction mode indicator for the PU, wherein when the PU is restricted to uni-directional inter prediction, the inter prediction mode indicator is able to indicate that the PU is either uni-directionally inter predicted based on a list 0 or uni-directionally inter predicted based on a list 1 , wherein when the PU is not restricted to uni-directional inter prediction, the inter prediction mode indicator is able to indicate the PU is either uni-directionally inter predicted based on the list 0 , uni-directionally inter predicted based on the list 1 , or bi-directionally predicted. 13. The method of claim 7 , further comprising entropy encoding the inter prediction mode indicator using different contexts depending on whether the PU is restricted to uni-directional inter prediction.