Music Visualizer

.block

license: MIT
height: 1500
border: no

README.md

Music Visualizer

d3.v4.min.js

// https://d3js.org Version 4.2.3. Copyright 2016 Mike Bostock.
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index.html

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		
		<!-- D3.js -->
		<script src="d3.v4.min.js" charset="utf-8"></script>

	</head>	
	<body>

		<audio src="Viva_la_Vida.ogg" autoplay="autoplay"></audio> 


		<script language="javascript" type="text/javascript">

		(function() {

		    var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
		    var audioElement = document.querySelector('audio')
		    var audioSrc = audioCtx.createMediaElementSource(audioElement);
		    var analyser = audioCtx.createAnalyser();

		    // bind our analyser to the media element source.
		    audioSrc.connect(analyser);
		    audioSrc.connect(audioCtx.destination);

		    // var frequencyData = new Uint8Array(analyser.frequencyBinCount);
		    var frequencyData = new Uint8Array(200);

		    var svgWidth = 1050,
		        svgHeight = 1500;

		    var svg = d3.select('body').append('svg')
		        .attr('height', svgHeight)
		        .attr('width', svgWidth)

		    //SVG filter for the gooey effect
			//Code taken from http://tympanus.net/codrops/2015/03/10/creative-gooey-effects/
			var defs = svg.append("defs");
			var filter = defs.append("filter").attr("id","gooeyCodeFilter");
			filter.append("feGaussianBlur")
				.attr("in","SourceGraphic")
				.attr("stdDeviation","10")
				//to fix safari: http://stackoverflow.com/questions/24295043/svg-gaussian-blur-in-safari-unexpectedly-lightens-image
				.attr("color-interpolation-filters","sRGB") 
				.attr("result","blur");
			filter.append("feColorMatrix")
				.attr("in","blur")
				.attr("mode","matrix")
				.attr("values","1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7")
				.attr("result","gooey");


			var circleWrapper = svg.append("g")
			.attr("class", "circleWrapper")
			.style("filter", "url(#gooeyCodeFilter)");

		    // continuously loop and update chart with frequency data.
		    function renderChart() {
		        requestAnimationFrame(renderChart);

		        // copy frequency data to frequencyData array.
		        analyser.getByteFrequencyData(frequencyData);
		        // console.log(frequencyData);

		        // scale things to fit
		        var radiusScale = d3.scaleLinear()
		            .domain([0, d3.max(frequencyData)])
		            .range([0, svgHeight/2 -10]);

		        var hueScale = d3.scaleLinear()
		            .domain([0, d3.max(frequencyData)])
		            .range([0, 360]);

		        // var colors = ["#F95B34", "#EE3E64", "#F36283", "#FF9C34", "#EBDE52", "#B7D84B", "#44ACCF"];

		        var xScale = d3.scaleLinear()
		        	.domain([0, frequencyData.length])
		        	.range([0, svgWidth])

		       	var yScale = d3.scaleLinear()
		       		.domain([0, d3.max(frequencyData)])
		       		.range([0, svgHeight])


		       // update d3 chart with new data
		       var circles = circleWrapper.selectAll('circle')
		           .data(frequencyData);	
		      
		        circles.exit().remove(); 

				circles.enter().append('circle')
		       		.merge(circles)
			            .attr('r', function(d) { return radiusScale(d) })
			            .attr('cx', function(d,i){ return xScale(i)} )
			            .attr('cy', function(d) { return yScale(d) })
			            .style('fill', 'none')
			            .style('stroke-width', 4)
			            .style('stroke-opacity', 0.4)
			            .style('stroke', function(d) { return d3.hsl(hueScale(d), 1, 0.5)})
		    }

		    // run the loop
			renderChart();

		    // // just for blocks viewer size
		    // d3.select(self.frameElement)
		    // 	.style('height', svgHeight+'px')
		    // 	.style('width', svgWidth+'px')

		}() );
											
		</script>

	</body>
</html>

Viva_la_Vida.ogg