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Dake He authored
This CL simplifies context derivation for nz and base level flags in level map. 1. Reduce SIG_COEF_CONTEXTS from 58 to 42. 2. NZ and base level flags share the same context offsets derived from a template of size 5 (down from 7). In limited runs, compression performance seems neutral if not better. Encoding time for a key frame on a local linux machine is reduced by about 25% or more. Change-Id: Ibd93b21c839154bc5ae26b993f9e66537cbf5942
03a32926