Replace deprecated processor with a worklet

src/voice/RecorderWorklet.ts

@@ -0,0 +1,37 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {ITimingPayload, PayloadEvent, WORKLET_NAME} from "./consts";
+
+// from AudioWorkletGlobalScope: https://developer.mozilla.org/en-US/docs/Web/API/AudioWorkletGlobalScope
+declare const currentTime: number;
+declare const currentFrame: number;
+declare const sampleRate: number;
+
+class MxVoiceWorklet extends AudioWorkletProcessor {
+    constructor() {
+        super();
+    }
+
+    process(inputs, outputs, parameters) {
+        this.port.postMessage(<ITimingPayload>{ev: PayloadEvent.Timekeep, timeSeconds: currentTime});
+        return true;
+    }
+}
+
+registerProcessor(WORKLET_NAME, MxVoiceWorklet);
+
+export default null; // to appease module loaders (we never use the export)