add creatWorker

packages/artplayer-plugin-flv/src/creatWorker.js

@@ -0,0 +1,58 @@
+export default class CreatWorker {
+    constructor() {
+        this.workers = new Map();
+    }
+
+    static fnToStr(fn) {
+        return `
+           self.onmessage = event => {
+               return self.postMessage((${fn}).apply(null, event.data));
+           }
+         `;
+    }
+
+    static create(fn) {
+        const blob = new Blob([CreatWorker.fnToStr(fn)], {
+            type: 'application/javascript',
+        });
+        const objectURL = window.URL.createObjectURL(blob);
+        const worker = new Worker(objectURL);
+        worker.kill = () => {
+            URL.revokeObjectURL(objectURL);
+            worker.terminate();
+        };
+        worker.post = args =>
+            new Promise((resolve, reject) => {
+                worker.onmessage = event => {
+                    resolve(event.data);
+                };
+                worker.onerror = error => {
+                    reject(error);
+                };
+                worker.postMessage(args);
+            });
+        return worker;
+    }
+
+    add(name, fn) {
+        if (!this.workers.has(name)) {
+            this.workers.set(name, CreatWorker.create(fn));
+        }
+    }
+
+    run(name, ...args) {
+        const worker = this.workers.get(name);
+        return worker.post(args);
+    }
+
+    kill(name) {
+        const worker = this.workers.get(name);
+        worker.kill();
+    }
+
+    killAll() {
+        this.workers.forEach(worker => {
+            worker.kill();
+        });
+    }
+}