Script for Audio Context Tutorial at my medium account (https://medium.com/@muhibbudins)

script.js

  function stream() {
    const
      audio  = new(window.AudioContext || window.webkitAudioContext)(),
      analyser = audio.createAnalyser();

    player.addEventListener('canplay', (e) => {
      let source = audio.createMediaElementSource(player);

      source.connect(analyser);

      analyser.connect(audio.destination);
      analyser.fftSize = 128;
      frequencyLength = analyser.frequencyBinCount;

      let frequency = new Uint8Array(frequencyLength);
      analyser.getByteFrequencyData(frequency);

      console.log(frequency)
    });
  };