• Dake He's avatar
    [level map] simplified context derivation · 03a32926
    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
entropymode.c 317 KB