webdaw-modules/publish/src/createNotes.js

a set of modules for building a web-based DAW

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createNotes = void 0;
var index = 0;
exports.createNotes = function (events) {
    var filtered = events.reduce(function (acc, val) {
        // console.log(val.type);
        if (val.type === 0x80 || val.type === 0x90) {
            acc.push(val);
        }
        return acc;
    }, []);
    // filtered = sortMIDIEvents(filtered);
    var notes = [];
    var tmp = {};
    filtered.forEach(function (e) {
        var id = e.trackId + "-" + e.noteNumber;
        // console.log(e.ticks, e.type, id);
        if (e.type === 0x90) {
            if (tmp[id]) {
                // console.warn(`note existed already! ${id}`);
            }
            else {
                tmp[id] = e;
            }
        }
        else if (e.type === 0x80) {
            if (!tmp[id]) {
                // console.warn(`note doesn't exist! ${id}`);
            }
            else {
                var noteOn = tmp[id];
                var note = {
                    id: "note-" + new Date().getTime() + "-" + index++,
                    noteOn: noteOn,
                    noteOff: e,
                };
                notes.push(note);
                delete tmp[id];
            }
        }
    });
    // console.log(notes);
    return notes;
};
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