Cineform RAW

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Cineform is a wavelet codec optimized for high visual fidelity and fast CPU performace.

VC-5 is a separate codec that uses some components from Cineform but the two codecs are not backwards compatible (see https://medium.com/@kierank_/reverse-engineering-the-gopro-cineform-codec-7411312bfe1c)

Cineform covers a wide range of use-cases. Currently the FFmpeg implementation supports YUV 4:2:2 10-bit, RGB 10/12-bit, RGBA 10/12-bit.

The FFmpeg decoder is quite slow - here are things that need to be done to make it fast:

  • Add SIMD transform with different versions for clip and shift (see below)
  • Merge prescale shift into transform (where necessary)
  • Merge decompanding with VLC Tables or use a LUT
  • Make transform happen inplace

Other TODOs:

  • Bayer files
  • Transform-type=2 files - seem to have more subbands and are different to normal (Cineform RAW and others)