Add an audio level peak meter

Author: philn

package.json

@@ -24,7 +24,8 @@
     "lint-staged": "^14.0.0",
     "prettier": "2.8.8",
     "serve-index": "^1.9.1",
-    "typescript": "^4.3.5"
+    "typescript": "^4.3.5",
+    "web-audio-peak-meter": "^3.1.0"
   },
   "dependencies": {
     "mp4box": "^0.5.2"

public/index.html

@@ -162,6 +162,7 @@
         <div id="loader_wrapper" style="display: none"><img class="loader_img" src="./assets/loader.svg"/></div>
         <canvas id="monitor" width="800" height="600"></canvas>
       </div>
+      <div id="peak-meter" style="width: 5em; height: 500px; margin: 1em 0;"></div>
 
     </div>