Add files via upload

src/audio.ts

@@ -0,0 +1,158 @@
+//Created by Ren Yuan
+
+
+let audioContext;
+if (typeof window !== 'undefined') {
+	window.AudioContext = window.AudioContext || (window as any).webkitAudioContext;
+	audioContext = new AudioContext();
+}
+
+
+export class AudioIn{
+	context:AudioContext;
+	node:MediaStreamAudioSourceNode;
+
+	constructor(callback:Function){
+		this.context = audioContext;
+		let constraints = {audio: true, video: false};
+		window.navigator.mediaDevices.getUserMedia(constraints).then((stream) => {
+			this.node = audioContext.createMediaStreamSource(stream);
+			callback();
+		}).catch((error) => {});
+	}
+
+	connect(node:AudioNode){
+		this.node.connect(node);
+	}
+
+	disconnect(){
+		this.node.disconnect();
+	}
+}
+
+
+export class Sound{
+	context:AudioContext;
+	audio:HTMLMediaElement;
+	node:MediaElementAudioSourceNode;
+
+	constructor(url:string, callback:Function){
+		this.context = audioContext;
+		this.audio = new Audio(url);
+		this.audio.addEventListener('loadeddata', () => {
+  			this.node = audioContext.createMediaElementSource(this.audio);
+  			callback();
+		});
+	}
+
+	duration():number{
+		return this.audio.duration;
+	}
+
+	currentTime():number{
+		return this.audio.currentTime;
+	}
+
+	volume():number{
+		return this.audio.volume;
+	}
+
+	paused():boolean{
+		return this.audio.paused;
+	}
+
+	loop(loop:boolean = true){
+		this.audio.loop = loop;
+	}
+
+	autoplay(auto:boolean = true){
+		this.audio.autoplay = auto;
+	}
+
+	play(){
+		this.audio.play();
+	}
+
+	pause(){
+		this.audio.pause();
+	}
+
+	connect(node:AudioNode){
+		this.node.connect(node);
+	}
+
+	disconnect(){
+		this.node.disconnect();
+	}
+}
+
+
+export class Analyser{
+	context:AudioContext;
+	node:AnalyserNode;
+
+	constructor(){
+		this.context = audioContext;
+		this.node = audioContext.createAnalyser();
+	}
+
+	analyze(audio:AudioIn|Sound){
+		audio.node.connect(this.node);
+	}
+
+	fftSize(fftSize:number){
+		this.node.fftSize = fftSize;
+	}
+
+	binCount():number{
+		return this.node.frequencyBinCount;
+	}
+
+	smooth(smoothing:number){
+		this.node.smoothingTimeConstant = smoothing;
+	}
+
+	level():number {
+		let data = this.timeDomain();
+	    let sum = 0;
+	    for (let i=0; i<data.length; i++) {
+	      	sum += data[i]*data[i];
+	    }
+	    sum /= data.length;
+	    return Math.sqrt(sum);
+  	}
+
+	timeDomain():number[]{
+		let timeDomain = new Uint8Array(this.node.frequencyBinCount);
+		this.node.getByteTimeDomainData(timeDomain);
+
+		let data = new Array(timeDomain.length);
+		for (let i=0; i<timeDomain.length; i++) {
+	    	data[i] = (timeDomain[i]-128)/128;
+	    }
+		return data;
+	}
+
+	freqDomain():number[]{
+		let freqDomain = new Uint8Array(this.node.frequencyBinCount);
+		this.node.getByteFrequencyData(freqDomain);
+
+		let data = new Array(freqDomain.length);
+		for (let i=0; i<freqDomain.length; i++) {
+	    	data[i] = freqDomain[i]/255;
+	    }
+		return data;
+	}
+
+	connect(node:AudioNode){
+		this.node.connect(node);
+	}
+
+	disconnect(){
+		this.node.disconnect();
+	}
+
+	output(){
+		this.node.connect(audioContext.destination);
+	}
+}