Question

如何启动基本WebRTC数据通道？

这是我到目前为止所做的，但它似乎甚至没有尝试连接。我确定我只是遗漏了一些基本的东西。

var RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection || window.msRTCPeerConnection;

var peerConnection = new RTCPeerConnection({
    iceServers: [
        {url: 'stun:stun1.l.google.com:19302'},
        {url: 'stun:stun2.l.google.com:19302'},
        {url: 'stun:stun3.l.google.com:19302'},
        {url: 'stun:stun4.l.google.com:19302'},
    ]
});
peerConnection.ondatachannel  = function () {
    console.log('peerConnection.ondatachannel');
};
peerConnection.onicecandidate = function () {
    console.log('peerConnection.onicecandidate');
};

var dataChannel = peerConnection.createDataChannel('myLabel', {
});

dataChannel.onerror = function (error) {
    console.log('dataChannel.onerror');
};

dataChannel.onmessage = function (event) {
    console.log('dataChannel.onmessage');
};

dataChannel.onopen = function () {
    console.log('dataChannel.onopen');
    dataChannel.send('Hello World!');
};

dataChannel.onclose = function () {
    console.log('dataChannel.onclose');
};
console.log(peerConnection, dataChannel);

Answer 1

WebRTC假设您有办法向您想要联系的人发送信号（向其发送要约字符串，并从中接收答案字符串）。没有一些服务器，你会怎么做？

为了说明，这里有一些代码可以完成除此之外的所有操作（适用于Firefox和Chrome 45）：

//Save the variables from the form before continuing
if(!formEnvironment.saveFormComponents())
{
    Util.logError(context, "Unable to save form components");
}

var config = { iceServers: [{ urls: "stun:stun.l.google.com:19302" }]};
var dc, pc = new RTCPeerConnection(config);
pc.ondatachannel = e => {
  dc = e.channel;
  dc.onopen = e => (log("Chat!"), chat.select());
  dc.onmessage = e => log(e.data);
}

function createOffer() {
  button.disabled = true;
  pc.ondatachannel({ channel: pc.createDataChannel("chat") });
  pc.createOffer().then(d => pc.setLocalDescription(d)).catch(failed);
  pc.onicecandidate = e => {
    if (e.candidate) return;
    offer.value = pc.localDescription.sdp;
    offer.select();
    answer.placeholder = "Paste answer here";
  };
};

offer.onkeypress = e => {
  if (e.keyCode != 13 || pc.signalingState != "stable") return;
  button.disabled = offer.disabled = true;
  var obj = { type:"offer", sdp:offer.value };
  pc.setRemoteDescription(new RTCSessionDescription(obj))
  .then(() => pc.createAnswer()).then(d => pc.setLocalDescription(d))
  .catch(failed);
  pc.onicecandidate = e => {
    if (e.candidate) return;
    answer.focus();
    answer.value = pc.localDescription.sdp;
    answer.select();
  };
};

answer.onkeypress = e => {
  if (e.keyCode != 13 || pc.signalingState != "have-local-offer") return;
  answer.disabled = true;
  var obj = { type:"answer", sdp:answer.value };
  pc.setRemoteDescription(new RTCSessionDescription(obj)).catch(failed);
};

chat.onkeypress = e => {
  if (e.keyCode != 13) return;
  dc.send(chat.value);
  log(chat.value);
  chat.value = "";
};

var log = msg => div.innerHTML += "<p>" + msg + "</p>";
var failed = e => log(e + ", line " + e.lineNumber);

在第二个标签页中打开此页面，您可以从一个标签页聊天到另一个标签页（或世界各地的其他计算机）。什么臭，你必须自己得到报价：

按Tab A中的<script src="https://rawgit.com/webrtc/adapter/master/adapter.js"></script> <button id="button" onclick="createOffer()">Offer:</button> <textarea id="offer" placeholder="Paste offer here"></textarea><br> Answer: <textarea id="answer"></textarea><br><div id="div"></div> Chat: <input id="chat"></input><br>按钮（仅限），等待1-20秒，直至看到要约文字，
将商品标签从标签A复制粘贴到标签B，然后点击Offer
将标签B中显示的答案文字复制粘贴到标签A，然后点击Enter。

现在，您应该可以在不使用服务器的选项卡之间进行聊天。

正如您所看到的，这是一种低于标准的体验，这就是为什么您需要一些基本的websocket服务器来传递A / B之间的提供/回答（以及如果想要快速连接的涓冰候选者），开始吧。一旦建立了连接，就可以使用数据通道进行一些额外的工作。

如何启动基本的WebRTC数据通道？

1 个答案: