• Thomas Davies's avatar
    EC_ADAPT: Perform backwards updates directly on CDFs. · 028b57f5
    Thomas Davies authored
    The initial CDF for each frame is stored in
    the frame context. CDFs for actual coding are
    stored in the tile structures, and these are
    what get adapted. The initial CDF is replaced
    by an average CDF derived from these tile CDFs.
    This is carried forward to future frames when
    backward adaptation is on.
    CDFs are no longer set from the 8 bit probabilities
    in backwards adaptation.
    For now, 8 bit probabilities are maintained for
    use in the encoder and for symbols which do not
    have a CDF.
    Change-Id: I106b30510bfad1fa57d077f7702acc1864378a09