dreemgl/system/rpc/webrtc.js

DreemGL is an open-source multi-screen prototyping framework for mediated environments, with a visual editor and shader styling for webGL and DALi runtimes written in JavaScript. As a toolkit for gpu-accelerated multiscreen development, DreemGL includes

/* DreemGL is a collaboration between Teeming Society & Samsung Electronics, sponsored by Samsung and others.
   Copyright 2015-2016 Teeming Society. Licensed under the Apache License, Version 2.0 (the "License"); You may not use this file except in compliance with the License.
   You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing,
   software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and limitations under the License.*/
// WebRTC class

define.class(function(require, exports){
	var WebRTCData = exports
	
	WebRTCData.createOffer = function(){
		var obj = new WebRTCData()
		
		if(typeof webkitRTCPeerConnection === 'undefined') return obj

		obj.pc = new webkitRTCPeerConnection(
			{ "iceServers": [{ "url": "stun:stun.l.google.com:19302" }]
			}, {optional: [{RtpDataChannels: true}]})

		obj.pc.onicecandidate = function(event){
			if (!event || !event.candidate) return
			this.atIceCandidate(event.candidate)
		}.bind(obj)
	
		obj.setChannel(obj.pc.createDataChannel('RTCDataChannel',{reliable:false}))

		obj.pc.createOffer(function(desc){
			this.pc.setLocalDescription(desc)
			this.atOffer(desc)
		}.bind(obj), null, obj.media_constraints)

		return obj
	}

	WebRTCData.acceptOffer = function(offer){
		var obj = new WebRTCData()

		obj.pc = new webkitRTCPeerConnection(
			{"iceServers": [{ "url": "stun:stun.l.google.com:19302" }]},
			{optional: [{RtpDataChannels: true}]})

		obj.setChannel(obj.pc.createDataChannel('RTCDataChannel', { reliable: false }))

	    obj.pc.onicecandidate = function (event) {
	        if (!event || !event.candidate) return
	       	this.atIceCandidate(event.candidate)
	    	//this.pc.addIceCandidate(event.candidate)
	    }.bind(obj)

	    obj.pc.setRemoteDescription(new RTCSessionDescription(offer))

	    obj.pc.createAnswer(function (session){
	    	this.pc.setLocalDescription(session)
	        this.atAnswer(session)
	    }.bind(obj), null, obj.media_constraints)

	    return obj
	}

	this.media_constraints = {
		optional: [],
		mandatory: {
			OfferToReceiveAudio: false, // Hmm!!
			OfferToReceiveVideo: false // Hmm!!
		}
	}

	this.addCandidate = function(candidate){
		this.pc.addIceCandidate(new RTCIceCandidate(candidate))
	}

	this.acceptAnswer = function(desc){
		this.pc.setRemoteDescription(new RTCSessionDescription(desc))
	}

	this.send = function(msg){
		if(!this.open){
			if(!this.queue) this.queue = []
			this.queue.push(msg)
		}
		else this.channel.send(msg)
	}

	// hooks
	this.atOffer = function(){
	}
	
	this.atAnswer = function(){
	}

	this.atIceCandidate = function(){
	}

	this.atOpen = function(){
	}

	this.atClose = function(){
		console.log('webRTC onClose')
	}
	this.atError = function(){
		console.log('webRTC on Error')
	}
	this.atMessage = function(){
	}

	this.setChannel = function(channel){
		this.channel = channel
		channel.onmessage = function(event){
			this.atMessage(event.data, event.timeStamp)
		}.bind(this)
		channel.onopen = function(){
			this.open = true
			this.atOpen.apply(this, arguments)
		}.bind(this)
		channel.onclose = function(){
			this.open = false
			this.atClose.apply(this, arguments)
		}.bind(this)
		channel.onerror = function(){
			this.atError.apply(this, arguments)
		}.bind(this)
	}

	this.acceptOffer = function(offer){
		this.pc.acceptOffer(offer)
	}
})