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HTML

              
                .cover
.main
	.balls
		- for (var i=0; i<12; i++)
			.ball
				.drop
	.control
	
svg(xmlns='http://www.w3.org/2000/svg', version='1.1')
	defs
		filter#goo
			fegaussianblur(in='SourceGraphic', stddeviation='10', result='blur')
			fecolormatrix(in='blur', mode='matrix', values='1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 20 -5', result='goo')
			feblend(in='SourceGraphic', in2='goo')
              
            
!

CSS

              
                $mainSize: 200px;
$ballSize: 30px;
$ballCount: 12;
$rotateTime: 5s;

$bgcolor:#0d0b0c;
$goocolor:#c00d1e;
$controlcolor:#f6f6f6;
$border: none; //3px solid $bgcolor; //to see the elements

html, body {
	width:100%;
	height:100%;
	//min-width:$mainSize * 3;
	//min-height:$mainSize * 3;
}
body {
	background:$bgcolor;
	display: flex;
	align-items: center;
	justify-content: center;
	overflow:hidden;
}

svg { //Firefox bug fix
	position:absolute;
	z-index:-100;
	pointer-events:none;
}

.main {
	padding:$mainSize;
	position:relative;
	filter:url('#goo');
	opacity:0.85;
	transition:0.5s opacity;
	transition-delay:1s;
	&:hover {
		opacity:0.975;
		transition-delay:0s;
	}
	.control {
		position:relative;
		width:$mainSize;
		height:$mainSize;
		background:$goocolor;
		border:$border;
		border-radius:50%;
		cursor:pointer;
		text-align:center;
		color:$controlcolor;
		font-size:$mainSize/2;
		line-height:$mainSize;
		font-family:FontAwesome;
		&::after {
			content:'\f04b';
			position:relative;
			left:8px;
		}
		&.playing::after {
			content:'\f04c';//f04d';
			left:0;
		}
		&.loading::after {
			display: block;
			content:'\f110';
			left:0;
			animation:spin linear 1s infinite;
		}
	}
	.balls {
		position:absolute;
		top:0;left:0;bottom:0;right:0;
		animation:spin linear $rotateTime infinite;
		.ball {
			position:absolute;
			top: $mainSize / 2;
			left: 3*$mainSize/2 - $ballSize/2;
			width:$ballSize;
			height:$ballSize;
			transform-origin: $ballSize/2 $mainSize;
			.drop {
				content: '';
				display:  inline-block;
				width: $ballSize;
				height: $ballSize;
				border-radius: 50%;
				background-color: $goocolor;
				border:$border;
				transform:translateY($mainSize/2);
			}
			@for $i from 1 through $ballCount {
				&:nth-child(#{$i}) {
					transform:rotate(#{round(360/$ballCount * ($i - 1))}deg);
				}
			}
		}
	}
}

.cover {
	&::before, &::after {
		position:absolute;
		top:0;left:0;bottom:0;right:0;
		content:'';
		display:block;
			background:url('https://reneroth.xyz/files/codepen/dornendiamant.jpg');
		background-position:center center;
		background-repeat:no-repeat;
	}
	&::before {
		background-size:cover;
		filter:blur(10px);
	}
	&::after {
		background-size:contain;
	}
}

@keyframes spin {
	0% {
		transform: rotate(0);
	}
	100% {
		transform: rotate(360deg);
	}
}
              
            
!

JS

              
                var minY = 135; //lowest point
var maxY = 10; //highest point
var pausePosition = 0.75; //position of balls when not playing, percentage
var reverse = false; //reverse lowest and highest
var offsetBalls = true; //mix balls
var smoothFac = 0.85; //value smoothing for ball position
var smoothFacPause = 0.975; //value smoothing when paused
var cutoffLow = 0.1; //percentage of sound spectrum that's cut off from the bottom
var cutoffHigh = 0.65; //percentage of sound spectrum that's cut off from the top
var songUrl = "https://reneroth.xyz/files/codepen/frozen.mp3"; //this needs correct Access-Control-Allow-Origin headers

var $c = $('.control');
var isLoaded = false;
var $d = $('.drop');
if (reverse) {
		var tmp = minY;
		minY = maxY;
		maxY = tmp;
}

$c.click(function(e) {
		e.preventDefault();
		if (!isLoaded) {
				if ($c.hasClass('loading')) {
						return;
				}
				$c.addClass('loading');
				eq.play(songUrl, function() {
						$c.removeClass('loading').addClass('playing');
						isLoaded = true;
				});
		} else {
				if ($c.hasClass('playing')) {
						$c.removeClass('playing');
						eq.stopSound();
				} else {
						$c.addClass('playing');
						eq.replaySound();
				}
		}
});

var offsets = [];

function doRender() {
		requestAnimationFrame(doRender);
		$d.each(function(i) {
			
				if(offsetBalls) {
					if(i%2 != 0) {
						i = Math.ceil($d.length/2) + (i-1)/2;
					} else {
						i /= 2;
					}
				}
			
				if (typeof offsets[i]=='undefined') {
						offsets[i] = 0;
				}
				var a = eq.getSpectrumByPercentage((i + 0) / ($d.length)) / 255;
				if ($c.hasClass('playing')) {
					offsets[i] = a * (1 - smoothFac) + offsets[i] * smoothFac;
				} else {
					a = pausePosition;
					offsets[i] = a * (1 - smoothFacPause) + offsets[i] * smoothFacPause;
				}
				var y = minY - (minY - maxY) * offsets[i];
				$(this).css('transform', 'translateY(' + y + 'px)');
		});
}

//this part below is taken and modified from Jaakko Alajoki's pen #rVPGBe
var Equalizer = new Function();
if (!window.AudioContext) {
		if (!window.webkitAudioContext) {
				alert('no audiocontext found');
		}
		window.AudioContext = window.webkitAudioContext;
}
Equalizer.prototype.context = new AudioContext();
Equalizer.prototype.audioBuffer = [];
Equalizer.prototype.sourceNode = {};
Equalizer.prototype.analyser = {};
Equalizer.prototype.javascriptNode = {};
Equalizer.prototype.audioData = [];
Equalizer.prototype.fftSize = 512;
Equalizer.prototype.playStart = 0;
Equalizer.prototype.playResume = 0;
Equalizer.prototype.buffer = [];

Equalizer.prototype.play = function(url, loadCallback) {
		var self = this;
		this.javascriptNode = this.context.createScriptProcessor(2048, 1, 1);
		this.javascriptNode.connect(this.context.destination);
		this.javascriptNode.onaudioprocess = function() {
				self.processAudio();
		};

		this.analyser = this.context.createAnalyser();
		this.analyser.smoothingTimeConstant = 0.2;

		this.analyser.fftSize = this.fftSize;

		this.sourceNode = this.context.createBufferSource();
		this.sourceNode.connect(this.analyser);

		this.analyser.connect(this.javascriptNode);

		this.sourceNode.connect(this.context.destination);

		var request = new XMLHttpRequest();
		request.open('GET', url, true);
		request.responseType = 'arraybuffer';

		request.onload = function() {
				self.context.decodeAudioData(request.response, function(buffer) {
						self.buffer = buffer;
						self.playSound(buffer);
						if (typeof(loadCallback) !== "undefined") {
								loadCallback();
						}
				});
		}
		request.send();
}

Equalizer.prototype.playSound = function(buffer) {
		this.sourceNode.buffer = buffer;
		this.sourceNode.loop = true;
		this.sourceNode.start(0);
		this.playStart = new Date().getTime();
}

Equalizer.prototype.stopSound = function() {
		this.playResume= new Date().getTime();
		this.playResume-=this.playStart;
		this.playResume/=1000;
		this.playResume%=this.sourceNode.buffer.duration;
		this.sourceNode.stop();
}

Equalizer.prototype.replaySound = function() {
		this.sourceNode = this.context.createBufferSource();
		this.sourceNode.connect(this.analyser);
		this.sourceNode.connect(this.context.destination);
		this.sourceNode.buffer = this.buffer;
		this.sourceNode.loop = true;
		this.sourceNode.start(0,this.playResume);
		this.playStart = new Date().getTime()-this.playResume*1000;
}

Equalizer.prototype.processAudio = function() {
		this.audioData = new Uint8Array(this.analyser.frequencyBinCount);
		this.analyser.getByteFrequencyData(this.audioData);

}

Equalizer.prototype.getSpectrum = function() {
		return this.audioData;
}

Equalizer.prototype.getSpectrumAt = function(i) {
		return typeof(this.audioData[i]) !== "undefined" ? this.audioData[i] : 0;
}

Equalizer.prototype.getSpectrumByPercentage = function(p) {
		var modLength = this.audioData.length - Math.floor(cutoffLow * this.audioData.length + cutoffHigh * this.audioData.length);
		var i = Math.floor(p * modLength + cutoffLow * this.audioData.length);
		return typeof(this.audioData[i]) !== "undefined" ? this.audioData[i] : 0;
}

var eq = new Equalizer();
doRender();
              
            
!
999px

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