57 lines
2.0 KiB
JavaScript
57 lines
2.0 KiB
JavaScript
import { evaluate, tryEvaluate, evaluateCommand } from "./Evaluator";
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const zeroPad = (num, places) => String(num).padStart(places, '0')
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export class TransportNode extends AudioWorkletNode {
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constructor(context, options, application) {
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super(context, "transport", options);
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this.app = application
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this.port.addEventListener("message", this.handleMessage);
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this.port.start();
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/** @type {HTMLSpanElement} */
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this.$clock = document.getElementById("clockviewer");
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this.hasBeenEvaluated = false;
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this.currentPulse = 0;
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}
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/** @type {(this: MessagePort, ev: MessageEvent<any>) => any} */
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handleMessage = (message) => {
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if (message.data && message.data.type === "bang") {
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let info = this.convertTimeToBarsBeats(message.data.currentTime);
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this.app.clock.time_position = { bar: info.bar, beat: info.beat, pulse: info.ppqn }
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this.$clock.innerHTML = `[${info.bar} | ${info.beat} | ${zeroPad(info.ppqn, '2')}]`
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// Evaluate the global buffer only once per ppqn value
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if (this.currentPulse !== info.ppqn) {
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this.hasBeenEvaluated = false;
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}
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if (!this.hasBeenEvaluated) {
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tryEvaluate( this.app, this.app.global_buffer );
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this.hasBeenEvaluated = true;
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this.currentPulse = info.ppqn;
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}
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}
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};
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start() {
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this.port.postMessage("start");
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}
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pause() {
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this.port.postMessage("pause");
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}
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convertTimeToBarsBeats(currentTime) {
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const beatDuration = 60 / this.app.clock.bpm;
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const beatNumber = (currentTime) / beatDuration;
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const beatsPerBar = this.app.clock.time_signature[0];
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const barNumber = Math.floor(beatNumber / beatsPerBar) + 1;
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const beatWithinBar = Math.floor(beatNumber % beatsPerBar) + 1;
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const ppqnPosition = Math.floor((beatNumber % 1) * this.app.clock.ppqn);
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this.app.clock.tick++
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return { bar: barNumber, beat: beatWithinBar, ppqn: ppqnPosition };
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}
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} |