JSFiddle - React, Tailwind, and code Playground

by juberti

HTML

<canvas class="visualizer" width="200" height="200"></canvas>
<button onclick="init()">
Push
</button>

JavaScript

/*
The MIT License (MIT)
Copyright (c) 2014 Chris Wilson
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Note: autoCorrelate comes from https://github.com/cwilso/PitchDetect/pull/23
with the above license.

*/
async function foo() {
  const stream = await navigator.mediaDevices.getUserMedia({audio: true});
  return stream;
}


async function init() {
  var source;
  var audioContext = new (window.AudioContext || window.webkitAudioContext)();
  var analyser = audioContext.createAnalyser();
  analyser.minDecibels = -100;
  analyser.maxDecibels = -10;
  analyser.smoothingTimeConstant = 0.85;
  const stream = await foo();
  
          // Initialize the SourceNode
  source = audioContext.createMediaStreamSource(stream);
          // Connect the source node to the analyzer
  source.connect(analyser);
      

  // Visualizing, copied from voice change o matic
  var canvas = document.querySelector('.visualizer');
  var canvasContext = canvas.getContext("2d");
  var WIDTH;
  var HEIGHT;

  function visualize() {
   ...