New Frame hook for music - fire 1/100th second instead of 1/TICRATE

[mazmazz]

Because

1. ThinkFrame is only precise by 1/TICRATE (1/35th second) whereas 1/100th is more precise for music
2. ThinkFrame does not run when you're not in a level. E.g., title screen, score card

Doesn't have to be 1/1000th (millisecond), I think 1/100th (centisecond) is good enough. Better than 1/35th, where music jumps are perceptible from imprecise position reading.

[mazmazz]

Is the right solution to execute hook every millisecond in mixer_sound? Is this desirable to call lua from I_Sound hardware code?

If from mixer, Millisecond hook must be performant or it will slow down sound processing.

Can we call a function every millisecond anywhere in the source?

At the very least, having a Frame hook outside of a level would be very helpful.

[mazmazz]

Advice from LJ Sonic:

Performance impact from running a hook 100 or 1000 times a second?

Possibly use system timers (or some kind of timer) to decouple from 1/TICRATE?

BUT: system timers are only checked 35 times a second. Sooooo, not possible? How to overcome this?