In one example an apparatus includes a video decoder said video decoder to determine the entropy coding the binary context as a function of the binary index value of the last effective coefficient indicating video data is configured of the block and decoding the binary using the determined context. the video decoder uses context adaptive binary arithmetic decoding CABAC to encode or decode the binary. The function may also depends on the size of the block. In this way context index indicating the context of the table does not needs to be stored by the device.

In one example a device includes a video coder configured to determine a context for entropy coding a bin of a value indicative of a last significant coefficient of a block of video data using a function of an index of the bin and code the bin using the determined context. The video coder may encode or decode the bin using context-adaptive binary arithmetic coding (CABAC). The function may also depend on a size of the block. In this manner a table indicating context indexes for the contexts need not be stored by the device.

In one example a device includes a video coder configured to determine a context for entropy coding a bin of a value indicative of a last significant coefficient of a block of video data using a function of an index of the bin and code the bin using the determined context. The video coder may encode or decode the bin using context-adaptive binary arithmetic coding (CABAC). The function may also depend on a size of the block. In this manner a table indicating context indexes for the contexts need not be stored by the device.