1. A method of initializing a context used to code video data in a context adaptive entropy coding process, the method comprising: determining a first initialization parameter index value as x>>4, where x is an 8-bit parameter; determining a second initialization parameter index value as x&15, where x is the same 8-bit parameter; setting a slope parameter of a linear model equal to an output of a first function, the first function being a linear function of the form c0*m+c1, where m is the first initialization parameter index value and c0 and c1 are parameters of the linear function; setting an intersection parameter of the linear model equal to an output of a second function, the second function being a function of the second initialization parameter index value; and initializing, based on the slope and intersection parameters, a state of the context used to code video data in the context adaptive entropy coding process.