Calculate those coefficients 😎😎
Simply get yourself a headerless signed 8-bit PCM file (Audacity can export to that format 😇), rename it to dct.raw (I didn't include a default dct.raw because the one I have on-hand is copyrighted and also 200kbs), put it in your current working directory (here), and zig build run!
The program will return a list of DCT coefficients! Then, head to this convenient Desmos graph I created and paste the coefficients into the brackets of the K = [ ] line and you should see a snazzy audio signature. You can change the amplitude scale by changing that 100 at the bottom!