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<section id="links">
  <a target="_blank" href="https://codepen.io/Rumyra/full/PbYGNB/">View over Https</a>
  <a target="_blank" href="https://codepen.io/Rumyra/post/audiovis-codevember-day-two-more-bridget">Read Blog Post</a>
</section>

<div id="screen">
  <section></section>
  <section></section>
  <section></section>
  <section></section>
  <section></section>
  <section></section>
  <section></section>
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</div>
            
          
!
            
              html {background:#efefef; font-family:"Lato", "Lucida Grande","Lucida Sans Unicode", Tahoma, Sans-Serif; letter-spacing:-0.2px;}
body {margin:0px; padding:0px;}
#links {
  display:flex; padding:5px;
  justify-content:space-around;
  a {
    display:block; padding:5px 15px;
    border: 3px solid #343436; border-radius: 3px;
    background-color:#343436;
    text-align:center; text-decoration:none; color:#fff;
    &:hover {background-color:#4d4d50;}
  }
}

    #screen {
      position: relative;
      width: 100vw; height: 100vh;
      background: black;
      display: flex;
      align-items: stretch;
    }
    #screen section {
      background-color: white;
      background-image: linear-gradient(to bottom, black 50%, white 50%);
      background-size: 20vh 20vh;
      flex:1;
    }
    #screen section:nth-of-type(2n) {
      background-color: black;
      background-position: 0 10vh;
    }
            
          
!
            
              // set up audio context
var audioContext = (window.AudioContext || window.webkitAudioContext);
// create audio class
if (audioContext) {
  // Web Audio API is available.
  var audioAPI = new audioContext();
} else {
  // Web Audio API is not available. Ask the user to use a supported browser.
  alert("Oh nos! It appears your browser does not support the Web Audio API, please upgrade or use a different browser");
}

// variables
var analyserNode,
    frequencyData = new Uint8Array(256);
const screen = document.querySelector('#screen'),
    allRepeatedEls = document.querySelectorAll('#screen section'),
    totalEls = allRepeatedEls.length;

// create an audio API analyser node and connect to source
function createAnalyserNode(audioSource) {
  analyserNode = audioAPI.createAnalyser();
  analyserNode.fftSize = 512;
  audioSource.connect(analyserNode);
}

// get's html elements, loops over them & attaches a frequency from analysed data - what you do is up to you!
function animateStuff() {
  requestAnimationFrame(animateStuff);
  analyserNode.getByteFrequencyData(frequencyData);

  
  for (let i=0; i<totalEls; i++) {

    var freqVol = frequencyData[i*16];

    if (freqVol <= 255 && freqVol > 150) {
      allRepeatedEls[i].style.flex = 2;
    } else if (freqVol <= 150 && freqVol > 90) {
      allRepeatedEls[i].style.flex = 1.5;
    } else if (freqVol <= 90 && freqVol > 40) {
      allRepeatedEls[i].style.flex = 0.5;
    } else { //50 or below
      allRepeatedEls[i].style.flex = 1;      
    }
  }

}

// getUserMedia success callback -> pipe audio stream into audio API
var gotStream = function(stream) {
    // Create an audio input from the stream.
    var audioSource = audioAPI.createMediaStreamSource(stream);
    createAnalyserNode(audioSource);
    animateStuff();
}

// pipe in analysing to getUserMedia
navigator.mediaDevices.getUserMedia({ audio: true, video: false })
  .then(gotStream);
            
          
!
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