WebRTC视频会议（多对多） [英] WebRTC videoconferencing (many-to-many)

问题描述

我即将使用webRTC + socket.io + node.js建立一个视频会议系统，所以我已经读过这本书作为Simon Pietro Romano的与webRTC进行实时通信的起点，我已经读完了，我我将在100 Mbps本地网络上运行这个系统，所以我将使用网状网络拓扑，因为带宽在这里不是问题，我不想专注于此，我只是有一个关于与许多用户合作的简单问题，特别是在使用这些函数时：

I am about to build a videoconferencing system using webRTC+socket.io+node.js, so I have read this book as start point "Real Time communications with webRTC" by Simon Pietro Romano, I already finished reading it, I am gonna run this system over a 100 Mbps local network, so I am gonna use the mesh network topology since bandwidth is no an issue here, I don't wanna focus on this, I just have a simple question on working with many users, specifically on using these functions:

var pc // PeerConnection Object

pc.onaddstream = ...//for receiving stream from remote party
pc.setRemoteDescription()...//for setting .sdp file from remote party

我知道我必须在每个对等体上建立点对点连接，但我们假设我有3个用户：A，B和C.

I know I have to make a peer-to-peer connection on each peer, but Let's suppose that I have 3 users: A, B and C.

A将成为房间发起人，然后B加入房间，这里A向B发送报价并收到B的回答，A setRemoteDescription（answe rB）和B setRemoteDescription（offerA），但是当C加入房间时，A和B将成为它的发起者，所以它们都会向C发送报价，而C会向它们发送答案，这是我的困惑：

A is gonna be the room initiator, then B joins the room, here A sends an offer to B and receives an answer from B, A setRemoteDescription(answerB) and B setRemoteDescription(offerA), but when C joins the room, A and B will be its initiators, so both of them will be send offers to C, and C will send answers to them, here is my confusion:

当C首次收到来自A的报价时，这是C setRemoteDescription（offerA），但是当收到来自B的报价时，这是C setRemoteDescription（offerB），我正在设置一个新值在这里丢失之前的A报价，这个程序只是暂时的吗？，C不再需要A报价吗？我知道这个sdp文件只包含webbrowser媒体信息。我对onaddstream有同样的疑问，这个程序是否会自动从一个对等端然后从另一个对等端捕获流？第一个捕获B的流，第二个从C开始，当最后一个加入房间时？在捕获C时，A会丢失B的流吗？ ？。

When C first receives offer from A, this is C setRemoteDescription(offerA), but when receiving offer from B, this is C setRemoteDescription(offerB), I am setting a new value here and losing the previous offer from A, is this procedure just temporary?, isn't C going to need the A offer anymore?, I know this sdp file just contains webbrowser media info. I have the same doubt with onaddstream, Does this procedure automatically catch stream from one peer and then from another peer?, A first catch B's stream and second from C when this last one joined the room?, Does A lose B's stream when catching C's?.

另一方面，addIceCandidate只是向每个对等体添加远程候选者，因此本地对等体具有远程对等体路由，它永远不会丢失远程对等体路由，I想想，我是对的吗？

On the other hand, addIceCandidate just adds remote candidates to each peer, so a local peer have the remote peers routes, it never loses the remote peers routes, I think, Am I right?

我找到了关于webRTC视频会议的源代码，我看到onaddstream和setRemoteDescription就像临时函数，一旦设置了对等体之间的连接，那些不再是必要的，我不知道，也许我错了。

I have found source code about webRTC videoconferencing and I have seen that onaddstream and setRemoteDescription are like temporary functions, once the connection between peers is set, those are not neccesary anymore, I don't know, maybe I am wrong.

提前致谢。

推荐答案

当C首次收到A的报价时，这是C
setRemoteDescription（offerA） ），但是当收到B的报价时，这是
C setRemoteDescription（offerB），我在这里设置一个新值，
从A中丢失之前的报价，这个程序是暂时的吗？
不再是C需要A报价吗？

When C first receives offer from A, this is C setRemoteDescription(offerA), but when receiving offer from B, this is C setRemoteDescription(offerB), I am setting a new value here and losing the previous offer from A, is this procedure just temporary?, isn't C going to need the A offer anymore?

你需要有一个对等连接（ pc ）在您的客户端，每个其他参与者，你将做类似的事情：

You will need to have a peer connection (pc) in your client side per each other participant, you will do something similar to:

socket.on('offer', function(from, data) {
    users[from].pc.setRemoteDescription(new RTCSessionDescription(data));
    // create answer..
});

请注意，节点服务器正在发送商品以及发送商品的用户的ID。此外，用户将包含每个房间参与者的条目，并引用其 pc 。您将为每个参与者添加远程描述到他们自己的 pc 。

Note that the Node server is sending the offer along with the id of the user who is sending it. Also, users will contain an entry per room participant with a reference to its pc. You will be adding the remote description for each participant to their own pc.

互联网上有很多例子，我正在 http://github.com/jconde/euphony ：）

There are plenty of examples in internet, mine is on http://github.com/jconde/euphony :)

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