Engine Library

Ref: Mixxx's Documentation

The only missing thing that I've noticed is that m.db's AlbumArt.hash isn't documented well. They assume it's an SHA-1 hash, and I can verify through reverse engineering their binary that it is. However, it seems like they may be modifying a constant in the SHA-1 algorithm, or modifying the binary blob of the image somehow prior to hashing.

Here's why I think they may be modifying the SHA-1 constants (ghidra analysis of Engine binary function in firmware 2.0.1):

Referencing the source file used for generating this function, I found that Boost's UUID SHA-1 implementation is the source file used to generate this. Note that h_[4] is set to 0x0141DF50, whereas the original source uses 0xC3D2E1F0.

I requested some more information on the Engine Community (Forum Post here). It seems like they don't know either (although hopefully someone will chime in with additional information).