Init commit

src/TransportNode.js

@@ -0,0 +1,49 @@
+import { evaluate, tryEvaluate, evaluateCommand } from "./Evaluator";
+
+export class TransportNode extends AudioWorkletNode {
+
+    constructor(context, options, application) {
+        super(context, "transport", options);
+        this.app = application
+        this.port.addEventListener("message", this.handleMessage);
+        this.port.start();
+        /** @type {HTMLSpanElement} */
+        this.$clock = document.getElementById("clockviewer");
+        this.offset_time = 0;
+    }
+    /** @type {(this: MessagePort, ev: MessageEvent<any>) => any} */
+    handleMessage = (message) => {
+        if (message.data === "bang") {
+            let info = this.convertTimeToBarsBeats(this.context.currentTime);
+            this.$clock.innerHTML = `${info.bar} / ${info.beat} / ${info.ppqn}`
+            this.app.clock.time_position = { bar: info.bar, beat: info.beat, pulse: info.ppqn }
+            tryEvaluate( this.app, this.app.global_buffer );
+        }
+    };
+
+    start() {
+        this.port.postMessage("start");
+    }
+
+    pause() {
+        this.port.postMessage("pause");
+    }
+
+    convertTimeToBarsBeats(currentTime) {
+      // Calculate the duration of one beat in seconds
+      const beatDuration = 60 / this.app.clock.bpm;
+
+      // Calculate the beat number
+      const beatNumber = (currentTime - this.offset_time) / beatDuration;
+
+      // Calculate the bar and beat numbers
+      const beatsPerBar = this.app.clock.time_signature[0];
+      const barNumber = Math.floor(beatNumber / beatsPerBar) + 1; // Adding 1 to make it 1-indexed
+      const beatWithinBar = Math.floor(beatNumber % beatsPerBar) + 1; // Adding 1 to make it 1-indexed
+
+      // Calculate the PPQN position
+      const ppqnPosition = Math.floor((beatNumber % 1) * this.app.clock.ppqn);
+      return { bar: barNumber, beat: beatWithinBar, ppqn: ppqnPosition };
+}
+
+}