nodejs-socketio-webaudio-sample/index.html at master · front-core/nodejs-socketio-webaudio-sample · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>リアルタイム通信して複数デバイス上で音声を再生する | Node.js(express) + Socket.IO + Web Audio API on Heroku</title>
<style>

html { height: 100%; }
body {
	font-family: ArialMT,"Hiragino Kaku Gothic ProN","ヒラギノ角ゴ ProN W3","メイリオ",sans-serif;
	margin: 0;
	padding: 0;
	height: 100%;
	-webkit-text-size-adjust: 100%;
	text-size-adjust: 100%;
	-webkit-tap-highlight-color: transparent;
	tap-highlight-color: transparent;
	position: relative;
}

button {
	display: block;
	-webkit-appearance: none;
	appearance: none;
	background: #ddd;
	width: 100px;
	height: 100px;
	-webkit-border-radius: 10px;
	border-radius: 10px;
	border: 1px solid #aaa;
	-webkit-user-select: none;
	user-select: none;
}
button:focus {
	outline: none;
}
.tap {
	background: #bbb;
}
#kick {
	position: absolute;
	top: 260px;
	left: 50%;
	margin-left: -50px;
}
#cymbal {
	position: absolute;
	top: 10px;
	left: 10px;
}
#hat {
	position: absolute;
	top: 130px;
	left: 10px;
}
#snare {
	position: absolute;
	top: 130px;
	right: 10px;
}
#result {
	opacity: 0;
	color: #ffff00;
	text-align: center;
	width: 200px;
	margin: -29px 0 0 -100px;
	padding: 20px 0;
	position: absolute;
	top: 50%;
	left: 50%;
	pointer-events: none;
	background-color: rgba(0,0,0,0.6);
	-webkit-border-radius: 5px;
	border-radius: 5px;
}
#result.popup {
	-webkit-animation: popup 0.6s linear 1;
	animation: popup 0.6s linear 1;
}
@-webkit-keyframes popup {
	0% { opacity: 0; -webkit-transform: scale3d(0.9, 0.9, 0.9); -webkit-transform: scale(0.9, 0.9); }
	5% { opacity: 1; -webkit-transform: scale3d(1, 1, 1); -webkit-transform: scale(1, 1); }
	100% { opacity: 0; -webkit-transform: scale3d(1.1, 1.1, 1.1); -webkit-transform: scale(1.1, 1.1); }
}
@keyframes popup {
	0% { opacity: 0; transform: scale3d(0.9, 0.9, 0.9); transform: scale(0.9, 0.9); }
	5% { opacity: 1; transform: scale3d(1, 1, 1); transform: scale(1, 1); }
	100% { opacity: 0; transform: scale3d(1.1, 1.1, 1.1); transform: scale(1.1, 1.1); }
}
#splash-image {
	text-align: center;
	width: 100%;
	height: 100%;
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	background-color: rgba(255,255,255,0.8);
	background-image: url(logo.png);
	background-position: 50% 50%;
	background-repeat: no-repeat;
	-webkit-background-size: 200px 35px;
	background-size: 200px 35px;
}
#splash-image.none { display: none; }
#splash-image.fade-out {
	-webkit-animation: fade-out 0.3s linear 1;
	animation: fade-out 0.3s linear 1;
}
@-webkit-keyframes fade-out {
	0% { opacity: 1; -webkit-transform: scale(1); }
	80% { opacity: 1; -webkit-transform: scale(0.97); }
	100% { opacity: 0; -webkit-transform: scale(2); }
}
@keyframes fade-out {
	0% { opacity: 1; transform: scale(1); }
	80% { opacity: 1; transform: scale(0.97); }
	100% { opacity: 0; transform: scale(2); }
}

</style>
</head>
<body>

	<button id="kick"> kick </button>
	<button id="cymbal"> cymbal </button>
	<button id="hat"> hat </button>
	<button id="snare"> snare </button>
	<div id="result"></div>
	<div id="splash-image"></div>

<script src="/socket.io/socket.io.js"></script>
<script>
;(function (window, undefined) {

	// socket.ioに接続する
	// var socketio = io.connect('http://localhost:8000'); // localで試す時
	var socketio = io.connect('https://nodejs-socketio-webaudio.herokuapp.com/'); // Herokuで試す時

	var drumObj = {}; // ドラムのbutton、音声情報を格納するObject

	var isTouchDevice = 'ontouchend' in document;
	var eventNames = {
		start: isTouchDevice ? 'touchstart' : 'mousedown',
		move:  isTouchDevice ? 'touchmove'  : 'mousemove',
		end:   isTouchDevice ? 'touchend'   : 'mouseup',
		click: 'click'
	};

	var result = document.getElementById('result'),　// ポップアップ用
		splashImage = document.getElementById('splash-image'); // スプラッシュ画像

	function AudioBufferLoader(ele, url) {
		window.AudioContext = window.AudioContext || window.webkitAudioContext;
		try {
			this.context = new AudioContext;
		}
		catch(e) {
			alert('Web Audio API is not supported in this browser');
		}
		this.ele = document.getElementById(ele);
		this.url = url;
		this.buffer = null;
	}

	AudioBufferLoader.prototype = {
		loadBuffer: function(url) {
			var _this = this;

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

			request.onload = function() {
				_this.context.decodeAudioData(
					request.response,
					function(buffer) {
						if (! buffer) {
							alert('error decodeing file data: ' + url);
							return;
						}
						_this.buffer = buffer;
						_this.events();
					},
					function(error) {
						alert('decodeAudioData error', error);
					}
				);
			};
			request.onerror = function() {
				alert('AudioBufferLoader: XHR error');
			};

			request.send();
		},

		events: function() {
			var _this = this;
			var context = _this.context;

			_this.ele.addEventListener(eventNames.start, function() {
				this.className = '';
				this.className = 'tap';
				result.className = "";

				// socket.ioで全デバイスで同期させる為、タップイベントでは再生せずサーバーからの返答時に再生
				// var source = context.createBufferSource();
				// source.buffer = _this.buffer;
				// source.connect(context.destination);
				// source.start(0);

				// クライアントからサーバーにボタンidを送る
				socketio.emit("from_client", this.id);
			});
			_this.ele.addEventListener(eventNames.end, function() {
				this.className = '';
			});
		},

		load: function() {
			var _this = this;
			_this.loadBuffer(_this.url);
		},

		// 音声データをセット
		set: function () {
			var _this = this;

			_this.source = _this.context.createBufferSource();
			_this.source.buffer = _this.buffer;
			_this.source.connect(_this.context.destination);
		}
	};

	drumObj.kick = new AudioBufferLoader('kick', '/sound/kick.m4a');
	drumObj.kick.load();

	drumObj.cymbal = new AudioBufferLoader('cymbal', '/sound/cymbal.m4a');
	drumObj.cymbal.load();

	drumObj.hat = new AudioBufferLoader('hat', '/sound/hat.m4a');
	drumObj.hat.load();

	drumObj.snare = new AudioBufferLoader('snare', '/sound/snare.m4a');
	drumObj.snare.load();

	// スプラッシュ画像を押した時に音声データをロード
	// iPhone/Androidで最初の音声ロードだけはユーザーアクションが必要な制約がある為(PCにはこの制約はなさそう)
	splashImage.addEventListener(eventNames.start, function(){
		// 音声データをセット
		drumObj.kick.set();
		drumObj.cymbal.set();
		drumObj.hat.set();
		drumObj.snare.set();

		// スプラッシュ画像をフェードアウト
		this.className = 'fade-out';
		this.addEventListener("webkitAnimationEnd", function(){ this.className = "none"; });
		this.addEventListener("animationend", function(){ this.className = "none"; });
	});

	// サーバーから "from_server" が送られてくるのを監視
	socketio.on("from_server", function(id){
		// サーバーから返されたid(buttonのid名)から音声を再生
		// start()だけを複数回実行出来ない仕様のようなので、毎回createBufferSource()してから再生
		drumObj[id].source = drumObj[id].context.createBufferSource();
		drumObj[id].source.buffer = drumObj[id].buffer;
		drumObj[id].source.connect(drumObj[id].context.destination);
		drumObj[id].source.start(0);

		// ポップアップを表示
		result.className = "popup";
		result.innerHTML = id + '!';
		result.addEventListener("webkitAnimationEnd", function(){ this.className = ""; });
		result.addEventListener("animationend", function(){ this.className = ""; });
	});

}(this));
</script>
</body>
</html>