13. An apparatus for entropy coding of video data, the apparatus comprising: a memory configured to store a plurality of contexts used in a context-adaptive entropy binary arithmetic (CABAC) process; and one or more processors configured to: determine a window size of a plurality of window sizes for a first context of the plurality of contexts; CABAC code, based on a probability state of the first context, a bin of a value for a first syntax element of the video data; update the probability state of the first context based on the window size for the first context the coded bin of the value for the first syntax element; determine a window size of the plurality of window sizes for a second context of the plurality of contexts, wherein the window size for the second context is different than the window size for the first context, and wherein the window size for the second context is not used to update the probability state of the first context; CABAC code, based on a probability state of the second context, a bin of a value for a second syntax element of the video data; and update the probability state of the second context based on the window size for the second context and the coded bin for the second syntax element.
15. The apparatus of claim 13 , wherein the window size for the first context and the window size for the second context are not signaled in a bitstream that includes the coded bin.