Adaptive entropy coding of coefficients, modes, mv.
This patch incorporates adaptive entropy coding of coefficient tokens, and mode/mv information based on distributions encountered in a frame. Specifically, there is an initial forward update to the probabilities in the bitstream as before for coding the symbols in the frame, however at the end of decoding each frame, the forward update to the probabilities is reverted and instead the probabilities are updated towards the actual distributions encountered within the frame. The amount of update is weighted by the number of hits within each context. Results on derf/hd/std-hd are all up by 1.6%. On derf, the most of the gains come from coefficients, however for the hd and std-hd sets, the most of the gains come from the mode/mv information updates. Change-Id: I708c0e11fdacafee04940fe7ae159ba6844005fd
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File mode changed from 100755 to 100644