Bink2 Again

So in some previous posts I’ve described Bink2 bitstream. What’s the catch? It applies only to KB2f files, newer versions (KB2g­—KB2i) use different bitstream format:

  • Block types are coded as an index in LRU list with an unary code;
  • One quantiser for the whole macroblock instead of individual per-component quantisers;
  • New CBP coding method for luma (it depends on number of bits set in the previous CBP and such)
  • DCs are coded as unary codes + additional bits instead of fixed bits + additional bits
  • AC coding now has skips coded before coefficients (previously first coefficient was always coded).

Implementations welcome.

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