Compute tail time from Biquad coefficients

third_party/WebKit/LayoutTests/webaudio/resources/audit-util.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 /**
  * @fileOverview  This file includes legacy utility functions for the layout
  *                test.
  */
 
+// How many frames in a WebAudio render quantum.
+let RENDER_QUANTUM_FRAMES = 128;
 
 function writeString(s, a, offset) {
   for (let i = 0; i < s.length; ++i) {
     a[offset + i] = s.charCodeAt(i);
   }
 }
 
 function writeInt16(n, a, offset) {
   n = Math.floor(n);
 
@@ skipping 316 matching lines @@
   let length = Math.min(actual.length, expected.length);
 
   for (let k = 0; k < length; ++k) {
     let diff = actual[k] - expected[k];
     signalPower += expected[k] * expected[k];
     noisePower += diff * diff;
   }
 
   return signalPower / noisePower;
 }