Question

我正在尝试使用http://webrtc.googlecode.com/svn/trunk/中编译的WebRTC iOS库创建iOS应用程序，目前我的后端服务器仅支持DTLS。

现在，当我尝试设置远程描述时，它返回以下错误

Warning(webrtcsession.cc:146): Session description must have SDES when DTLS disabled.
Error(webrtcsession.cc:268): SetRemoteDescription failed: Called with an SDP without SDES crypto and DTLS disabled locally.

但我在创建对等连接时将DtlsSrtpKeyAgreement = true设置为可选约束，如下所示

RTCPair *audio = [[RTCPair alloc] initWithKey:@"OfferToReceiveAudio" value:@"true"];
RTCPair *video = [[RTCPair alloc] initWithKey:@"OfferToReceiveVideo" value:@"false"];
NSArray *mandatoryConstraints = @[ audio, video ];

RTCPair *dtlsSrtpKeyAgreement = [[RTCPair alloc] initWithKey:@"DtlsSrtpKeyAgreement" value:@"true"];
NSArray *optionalConstraints = @[ dtlsSrtpKeyAgreement ];

RTCMediaConstraints *mediaConstraints = [[RTCMediaConstraints alloc]
                                            initWithMandatoryConstraints:mandatoryConstraints
                                            optionalConstraints:optionalConstraints];

[self.peerConnection createOfferWithDelegate:self constraints:mediaConstraints];

我只是想知道WebRTC原生iOS库目前是否仅支持SDES而不支持DTLS？

由于http://webrtc.googlecode.com/svn/trunk/talk/app/webrtc/objc/RTCPeerConnectionFactory.mm

中的以下部分代码，我对此表示怀疑

(RTCPeerConnection *)
    peerConnectionWithICEServers:(NSArray *)servers
                     constraints:(RTCMediaConstraints *)constraints
                        delegate:(id<RTCPeerConnectionDelegate>)delegate {
  webrtc::PeerConnectionInterface::IceServers iceServers;
  for (RTCICEServer *server in servers) {
    iceServers.push_back(server.iceServer);
  }
  webrtc::RTCPeerConnectionObserver *observer =
      new webrtc::RTCPeerConnectionObserver(delegate);
  webrtc::DTLSIdentityServiceInterface* dummy_dtls_identity_service = NULL;
  talk_base::scoped_refptr<webrtc::PeerConnectionInterface> peerConnection =
      self.nativeFactory->CreatePeerConnection(
          iceServers, constraints.constraints, dummy_dtls_identity_service,
          observer);
  RTCPeerConnection *pc =
      [[RTCPeerConnection alloc] initWithPeerConnection:peerConnection
                                               observer:observer];
  observer->SetPeerConnection(pc);
  return pc;
}

有人可以启发我吗？

Answer 1

在我创建PeerConnection对象时传递dtlsSrtpKeyAgreement约束，而不是在创建提议期间，即在createOfferWithDelegate调用期间，如上所述。

DTLS支持WebRTC iOS库

1 个答案: