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index.html
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index.html
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<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<script type="text/javascript">
$( document ).ready(function(){init()})
var audioContext = new AudioContext();
var analyserContext;
function init(){
initAudio()
}
function initAudio() {
if (!navigator.getUserMedia)
navigator.getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
if (!navigator.cancelAnimationFrame)
navigator.cancelAnimationFrame = navigator.webkitCancelAnimationFrame || navigator.mozCancelAnimationFrame;
if (!navigator.requestAnimationFrame)
navigator.requestAnimationFrame = navigator.webkitRequestAnimationFrame || navigator.mozRequestAnimationFrame;
navigator.getUserMedia(
{
"audio": {
"mandatory": {
"googEchoCancellation": "false",
"googAutoGainControl": "false",
"googNoiseSuppression": "false",
"googHighpassFilter": "false"
},
"optional": []
},
}, gotStream, function(e) {
alert('Error getting audio');
console.log(e);
});
function updateAnalysers(time) {
var canvas = document.getElementById("analyser");
if (!analyserContext) {
analyserContext = canvas.getContext('2d');
}
canvasWidth = window.innerWidth;
canvasHeight = window.innerHeight;
analyserContext.canvas.width = canvasWidth;
analyserContext.canvas.height = canvasHeight;
// analyzer draw code here
{
var spacing = 0.8;
var resolution = 300;
var numBars = resolution;
var freqByteData = new Uint8Array(analyserNode.frequencyBinCount);
var spectrumStart = -200
analyserNode.getByteFrequencyData(freqByteData);
analyserContext.clearRect(0, 0, canvasWidth, canvasHeight);
analyserContext.fillStyle = '#F6D565';
analyserContext.lineCap = 'round';
var multiplier = analyserNode.frequencyBinCount / numBars;
var arcSize = (360/resolution) - spacing;
var arcThickness = 5;
var border = 50;
var domeCenterX= canvasWidth/2;
var domeCenterY= canvasHeight/2;
var domeRadius = Math.min(canvasWidth/2, canvasHeight/2) - border;
var magnitude = 0;
var startingHue = 200;
var colourSensitvity = 1.3
var sensitivityCutoff = 0;
var reactionEnum = {
exp: 1,
log: 2,
negexp: 3,
lin: 4,
}
arcSize = Math.toRadians(arcSize)
var reactionCurve = reactionEnum.exp;
function fractionToRadians(numerator, denominator){
return ((numerator * 2/denominator)-1) * Math.PI ;
}
bassHit = Math.max(extractFreqRange(100,500,freqByteData)-20,0);
analyserContext.beginPath()
analyserContext.arc(domeCenterX,domeCenterY,domeRadius, 0, 2*Math.PI)
var grd = analyserContext.createRadialGradient(domeCenterX,domeCenterY,0,domeCenterX,domeCenterY,Math.pow(bassHit,2)/10);
grd.addColorStop(0,"hsl(" + 200 + ", 100%, " + Math.pow(bassHit,2)/100 + "%)")
grd.addColorStop(1,"black");
analyserContext.fillStyle=grd;
analyserContext.fill();
analyserContext.closePath();
// Draw rectangle for each frequency bin.
for (var i = 0; i < numBars; ++i) {
var offset = Math.floor( i * multiplier );
// gotta sum/average the block, or we miss narrow-bandwidth spikes
for (var j = 0; j< multiplier; j++)
magnitude += freqByteData[offset + j];
magnitude = magnitude / multiplier;
var magnitude2 = freqByteData[i * multiplier];
//start point for circle
arcStart = fractionToRadians(i , numBars)+(Math.toRadians(spectrumStart));
magnitude = Math.max(magnitude - sensitivityCutoff,0);
if(reactionCurve == 1){
magnitude = Math.pow(magnitude, 2)/300;
//console.log("exp")
};
if(reactionCurve == 2){
magnitude = Math.max(Math.log(magnitude),0) *20;
//console.log("log")
};
if(reactionCurve == 3){
magnitude = Math.pow(magnitude, -1/2)/100;
};
analyserContext.beginPath()
analyserContext.arc(domeCenterX,domeCenterY,domeRadius, arcStart, arcStart + arcSize)
analyserContext.strokeStyle = "hsl( 100, 0%, " + (100 - Math.round((i*100)/numBars)) + "%)"
analyserContext.lineWidth = arcThickness;
analyserContext.stroke();
analyserContext.closePath();
analyserContext.beginPath()
analyserContext.arc(domeCenterX,domeCenterY,Math.max(domeRadius - magnitude,0), arcStart, arcStart + arcSize )
analyserContext.strokeStyle = "hsl(" + ((magnitude * colourSensitvity) + startingHue)+ ", 100%, 50%)" // Math.round((i*100)/numBars)
analyserContext.lineWidth = arcThickness;
analyserContext.stroke();
analyserContext.closePath();
//analyserContext.fillStyle = "hsl( 100, 0%, " + Math.round((i*100)/numBars) + "%)"; // Math.round((i*360)/numBars)
//analyserContext.fillRect(Math.cos(i/numBars)*1000, Math.sin(i/numBars)*1000, BAR_WIDTH, -magnitude*5;
}
}
rafID = window.requestAnimationFrame( updateAnalysers );
}
function gotStream(stream) {
inputPoint = audioContext.createGain();
// Create an AudioNode from the stream.
realAudioInput = audioContext.createMediaStreamSource(stream);
audioInput = realAudioInput;
audioInput.connect(inputPoint);
// audioInput = convertToMono( input );
analyserNode = audioContext.createAnalyser();
analyserNode.fftSize = 2048;
inputPoint.connect( analyserNode );
//audioRecorder = new Recorder( inputPoint );
zeroGain = audioContext.createGain();
zeroGain.gain.value = 0.0;
inputPoint.connect( zeroGain );
zeroGain.connect( audioContext.destination );
updateAnalysers();
}
}
function resizeCanvas(){
console.log("resize canvas")
var w = $(window).width();
var h = $(window).height();
console.log("h = " + h)
console.log("w = " + w)
$("#analyser").css("width", w + "px");
$("#analyser").css("height", h + "px");
}
// Converts from degrees to radians.
Math.toRadians = function(degrees) {
return degrees * Math.PI / 180;
};
// Converts from radians to degrees.
Math.toDegrees = function(radians) {
return radians * 180 / Math.PI;
};
function extractFreqRange(start,end, byteData){
var sampleRate = 44100;
var fftSize = 512;
var hzBandRange = sampleRate/(fftSize/2)
var value = 0
var numberOfValues=0
i = 0
while(i*hzBandRange <= end){
if(i*hzBandRange >= start){
value += byteData[i]
numberOfValues++
}
i++
}
return value/numberOfValues
}
//make fullscreen
var fullscreen
$(window).click(function(){
if(!fullscreen){
var el = document.documentElement
, rfs =
el.requestFullScreen
|| el.webkitRequestFullScreen
|| el.mozRequestFullScreen
;
rfs.call(el);
fullscreen = true;
}else{
document.webkitExitFullscreen();
fullscreen = false;
}
})
</script>
<style>
html, body {
width: 100%;
height: 100%;
margin: 0px;
background-color: black
}
#analyser { background-color: black}
</style>
</head>
<body>
<div id="viz">
<canvas id="analyser" margin-left="auto" margin-right="auto" width="100%" height="100%" ></canvas>
</div>
</body>
</html>