@ng-web-apis/midi
Version:
An Observable based library for the use of Web MIDI API with Angular
17 lines • 2.48 kB
JavaScript
import { filter, map } from 'rxjs';
import { between } from '../utils/between';
/**
* Filter MIDI messages to notes only
*
* IMPORTANT: It normalizes noteOff events to noteOn with 0 velocity
*/
export function notes() {
return (source) => source.pipe(filter(({ data }) => between(data[0] ?? 0, 128, 159)), map((event) => {
if (between(event.data[0] ?? 0, 128, 143)) {
event.data[0] += 16;
event.data[2] = 0;
}
return event;
}));
}
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