DataChannel Webrtc Swift

Question

我想创建一个数据频道。但是我很难实施此功能。我添加了在"呼叫者侧"上运行的代码：

func initWebRTC() {
        RTCInitializeSSL()
        peerConnectionFactory = RTCPeerConnectionFactory()
        let mandatoryConstraints = ["OfferToReceiveAudio": "true", "OfferToReceiveVideo": "false"]
        let optionalConstraints = [ "DtlsSrtpKeyAgreement": "true", "RtpDataChannels" : "true"]

        mediaConstraints = RTCMediaConstraints.init(mandatoryConstraints: mandatoryConstraints, optionalConstraints: optionalConstraints)
    }
func prepareNewConnection() -> RTCPeerConnection {
        var icsServers: [RTCIceServer] = []
        icsServers.append(RTCIceServer(urlStrings: ["stun:stun.l.google.com:19302"], username:"",credential: ""))
        let rtcConfig: RTCConfiguration = RTCConfiguration()
        rtcConfig.tcpCandidatePolicy = RTCTcpCandidatePolicy.disabled
        rtcConfig.bundlePolicy = RTCBundlePolicy.maxBundle
        rtcConfig.rtcpMuxPolicy = RTCRtcpMuxPolicy.require
        rtcConfig.iceServers = icsServers;
        peerConnection = peerConnectionFactory.peerConnection(with: rtcConfig, constraints: mediaConstraints, delegate: self)
        peerConnection.add(mediaStream);
        let tt = RTCDataChannelConfiguration();
        tt.isOrdered = false;
        tt.isNegotiated = false
        self.dataChannel = peerConnection.dataChannel(forLabel: "datachannel", configuration: tt)
        self.dataChannel.delegate = self
        print("create datachannel")
        return peerConnection;
    }

我在报价之前创建数据渠道，如许多人所说。此方法（请参阅下一个代码）被调用多次。频道状态从2到3。

public func dataChannelDidChangeState(_ dataChannel: RTCDataChannel){
        print("channel.state (dataChannel.readyState.rawValue)");
    }

但是我需要在接收方面做什么？因为那里什么都没发生？我需要将数据通道绑定到接收器吗？如果是这样，我该怎么做？

Answer 1

创建数据通道表单呼叫者并发送报价后，您应该通过从Callee侧发送答案来建立对等连接。一旦建立对等连接，一旦数据频道准备好数据传输，在PeerConnection代表下面将在Callee侧调用。

- (void)peerConnection:(RTCPeerConnection*)peerConnection
didOpenDataChannel:(RTCDataChannel*)dataChannel

要检查PeerConnection是否成功地建立的位置，您可以使用下面的PeerConnection委托检查冰连接状态：

- (void)peerConnection:(RTCPeerConnection *)peerConnection
didChangeIceConnectionState:(RTCIceConnectionState)newState 

因此，如果newState == rtciceconnectionstateconted，则表示对等连接，并且您应该接到didopendatachannel呼叫。