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How are the values calculated, Ex. What value is used for slider and normal types.

I want to know this to be able to read this format.

How is info.songdata structured?

Only sliders have an identifying value which is constant, meaning it will always be '133769' (funny, I know) - so if you see this, you know that below it holds a slider note.
Note type values (W, A, D or S) are also constant, I don't know this off by heart but the note type for W is literally just the ASCII code for the W character, and so on for the others.

Unfortunately I don't remember completely how info.songdata is structured, but I think with a bit of tinkering it could be understood pretty fast. The song name and description is obvious and apart from them - if I'm not mistaken - the only other values are the difficulty, speed and offset. Their order I am unsure of.