Andrés Leone Gámez forestrf

WebAudio+WebSocketでブラウザへの音声リアルタイムストリーミングを実装する

WebRTCでやれよ！と言われそうなところですが、 WebSocket+WebAudioの組み合わせで音声ストリーミングをシンプルに構成する方法を紹介してみます。

サーバーサイドは何でも良いのですが、とりあえずNode.jsでtest.mp3というサンプルファイルをpcmモジュールでデコードし、 wsでクライアントに垂れ流す作りにしておきます。

	// Copyright (c) 2012 Calvin Rien
	// http://the.darktable.com
	//
	// This software is provided 'as-is', without any express or implied warranty. In
	// no event will the authors be held liable for any damages arising from the use
	// of this software.
	//
	// Permission is granted to anyone to use this software for any purpose,
	// including commercial applications, and to alter it and redistribute it freely,
	// subject to the following restrictions:

	/*--- checkForBadJavascripts()
	This is a utility function, meant to be used inside a Greasemonkey script that
	has the "@run-at document-start" directive set.

	It Checks for and deletes or replaces specific <script> tags.
	*/
	function checkForBadJavascripts (controlArray) {
	/*--- Note that this is a self-initializing function. The controlArray
	parameter is only active for the FIRST call. After that, it is an
	event listener.

	/* **************************************************************************
	Copyright 2012 Calvin Rien
	(http://the.darktable.com)

	Derived from a method in BuildManager, part of
	VoxelBoy's Unite 2012 Advanced Editor Scripting Talk.
	(http://bit.ly/EditorScripting)

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.

	using System;
	using System.Collections;
	using System.Collections.Generic;
	using UnityEditor;
	using UnityEngine;
	using Object = UnityEngine.Object;

	namespace Swing.Editor
	{
	public class EditorCoroutine

	using UnityEngine;

	public class EnumFlagAttribute : PropertyAttribute
	{
	public string enumName;

	public EnumFlagAttribute() {}

	public EnumFlagAttribute(string name)
	{

	// stats.js r9 - http://github.com/mrdoob/stats.js
	var Stats=function(){var h,a,r=0,s=0,i=Date.now(),u=i,t=i,l=0,n=1E3,o=0,e,j,f,b=[[16,16,48],[0,255,255]],m=0,p=1E3,q=0,d,k,g,c=[[16,48,16],[0,255,0]];h=document.createElement("div");h.style.cursor="pointer";h.style.width="80px";h.style.opacity="0.9";h.style.zIndex="10001";h.addEventListener("mousedown",function(a){a.preventDefault();r=(r+1)%2;0==r?(e.style.display="block",d.style.display="none"):(e.style.display="none",d.style.display="block")},!1);e=document.createElement("div");e.style.textAlign=
	"left";e.style.lineHeight="1.2em";e.style.backgroundColor="rgb("+Math.floor(b[0][0]/2)+","+Math.floor(b[0][1]/2)+","+Math.floor(b[0][2]/2)+")";e.style.padding="0 0 3px 3px";h.appendChild(e);j=document.createElement("div");j.style.fontFamily="Helvetica, Arial, sans-serif";j.style.fontSize="9px";j.style.color="rgb("+b[1][0]+","+b[1][1]+","+b[1][2]+")";j.style.fontWeight="bold";j.innerHTML="FPS";e.appendChild(j);f=document.createElement("div");f.style.position="relati

	/**
	* VH and VW units can cause issues on iOS devices: http://caniuse.com/#feat=viewport-units
	*
	* To overcome this, create media queries that target the width, height, and orientation of iOS devices.
	* It isn't optimal, but there is really no other way to solve the problem. In this example, I am fixing
	* the height of element `.foo` —which is a full width and height cover image.
	*
	* iOS Resolution Quick Reference: http://www.iosres.com/
	*/

	using UnityEngine;

	/*
	* Most functions taken from Tween.js - Licensed under the MIT license
	* at https://github.com/sole/tween.js
	* Quadratic.Bezier by @fonserbc - Licensed under WTFPL license
	*/
	public delegate float EasingFunction(float k);

	public class Easing

	public static class DebugUtil
	{

	public static void DumpRenderTexture(RenderTexture rt, string pngOutPath)
	{
	var oldRT = RenderTexture.active;

	var tex = new Texture2D(rt.width, rt.height);
	RenderTexture.active = rt;
	tex.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);