midi-toolkit-rs 0.3.1

A library for ultra high performance MIDI operations, designed for black MIDI. The library isn't perfect
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

use crate::gen_iter::GenIter;

use crate::{
    events::{BatchTempo, MIDIDelta},
    num::MIDINum,
    unwrap,
};

pub fn cancel_tempo_events<
    D: MIDINum,
    E: BatchTempo + MIDIDelta<D>,
    Err,
    I: Iterator<Item = Result<E, Err>> + Sized,
>(
    iter: I,
    new_tempo: u32,
) -> impl Iterator<Item = Result<E, Err>> {
    GenIter(
        #[coroutine]
        move || {
            let zero = D::zero();
            let mut extra_ticks = zero;
            let mut tempo = D::midi_num_from(500000);

            let new_tempo = tempo * (tempo / D::midi_num_from(new_tempo));

            for e in iter {
                let mut e = unwrap!(e);
                e.set_delta(e.delta() / new_tempo * tempo + extra_ticks);
                extra_ticks = zero;
                if let Some(inner_tempo) = e.inner_tempo() {
                    tempo = D::midi_num_from(inner_tempo);
                    let delta = e.delta();
                    if let Some(without_tempo) = e.without_tempo() {
                        e = without_tempo;
                    } else {
                        extra_ticks = delta;
                        continue;
                    }
                }
                yield Ok(e);
            }
        },
    )
}