FFR Suggestions

[qqwref]

Here's a big one: modify the FFR file format to keep more precise track of note timing.

Right now timings are stored as integer frames. That's been good so far, since this has been a 30 fps game for practically a decade, but there are a whole bunch of features that would be really cool, but would be very unpleasant to add (if not impossible) if we keep the timing this way. Different frame rates (45/60 fps?), rate mods, fractional offsets, non-frame-based timing, higher judge difficulties...

If you do make this change, one option is to just allow decimal frame numbers. So instead of [89, 'L', 'yellow'] or whatever you'd have something more like [88.7956, 'L', 'yellow']. The game would still place it on frame 89, because of rounding, but the greater accuracy would prevent any gameplay modifications from destroying the chart. Bonus advantage to doing it this way: you don't have to throw out the old charts, because the 30fps engine will still play them perfectly!