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Codevember AudioVis #9

A Pen By Rumyra

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HTML

            
              <section id="links">
  <a target="_blank" href="https://codepen.io/Rumyra/pen/NbdXaE?editors=1010">View over Https</a>
  <a target="_blank" href="https://codepen.io/Rumyra/post/audiovis-codevember-9-10">Read Blog Post</a>
</section>

<div id="screen">
<section><div>
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CSS

            
              html {background:#efefef; font-family:"Lato", "Lucida Grande","Lucida Sans Unicode", Tahoma, Sans-Serif; letter-spacing:-0.2px;}
body {margin:0px; padding:0px; overflow:hidden;}
#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-color: black;
    section {
      height: 30vh; width:100vw;
      position:absolute; left:0px; bottom:0px;
      div {
        height:30vh; width:100vw;
        display: flex;
        justify-content: space-around;
        align-items: flex-end;
        border-bottom:2px solid hsla(
            calc(10*var(--midFreqTwo)),
            60%,
            60%,
            0.7)
          ;
      span {
        display: block;
        width: calc(10vw*var(--lowFreqOne)); height: 20vh;
        border-radius: 7vw 7vw 0 0;
        background-color:hsla(300, 60%, 60%, 0.7);
        border:2px solid black;
        border-bottom-width: 0px;

        &:nth-of-type(1) {
          display: block;
          width: calc(30vw*var(--lowFreqOne));
          height: calc(20vh*var(--lowFreqThree));;
          border-radius: calc(20vw*var(--lowFreqThree)) calc(20vw*var(--lowFreqOne)) 0 0;
          background-color:hsla(
            calc(10*var(--lowFreqTwo)),
            60%,
            60%,
            0.7)
          ;
        }

        &:nth-of-type(2) {
          display: block;
          width: calc(30vw*var(--midFreqOne));
          height: calc(20vh*var(--midFreqThree));;
          border-radius: calc(20vw*var(--midFreqThree)) calc(20vw*var(--midFreqOne)) 0 0;
          background-color:hsla(
            calc(10*var(--midFreqTwo)),
            60%,
            60%,
            0.7)
          ;
        }

        &:nth-of-type(3) {
          display: block;
          width: calc(30vw*var(--highFreqOne));
          height: calc(20vh*var(--highFreqThree));;
          border-radius: calc(20vw*var(--highFreqThree)) calc(20vw*var(--highFreqOne)) 0 0;
          background-color:hsla(
            calc(10*var(--highFreqTwo)),
            60%,
            60%,
            0.7)
          ;
        }//nth
      }//span
      }//div
    }//section
  }
!

JS

            
              // 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'),
    waves = document.querySelectorAll('#screen section'),
    totalEls = waves.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);

  document.documentElement.style.setProperty('--lowFreqOne', frequencyData[3]/255);
  document.documentElement.style.setProperty('--lowFreqTwo', Math.floor(frequencyData[10]/4));
  document.documentElement.style.setProperty('--lowFreqThree', frequencyData[20]/255);

  document.documentElement.style.setProperty('--midFreqOne', frequencyData[30]/255);
  document.documentElement.style.setProperty('--midFreqTwo', Math.floor(frequencyData[45]/4));
  document.documentElement.style.setProperty('--midFreqThree', frequencyData[60]/255);

  document.documentElement.style.setProperty('--highFreqOne', frequencyData[80]/255);
  document.documentElement.style.setProperty('--highFreqTwo', Math.floor(frequencyData[100]/4));
  document.documentElement.style.setProperty('--highFreqThree', frequencyData[110]/255);

}

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

  waves[i].animate([
    // keyframes
    { transform: 'translateY(0vh)' }, 
    { transform: 'translateY(-100vh)' }
  ], { 
    // timing options
    duration: 3000,
    delay: i*100,
    iterations: Infinity
  });

  console.log(i*100);
}

// 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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