javascript - WebRTC setRemoteDescription 错误

Question

我想测试我的 C++ 应用程序和浏览器 JavaScript 之间的连接。现在我没有涉及服务器，我正在通过标准 IO 自己做信号处理。问题是当我尝试将 native 应用程序生成的 sdp 传递给 javascript 以创建答案时，我收到错误消息(在 setRemoteDescription 调用时生成):

OperationError: Failed to parse SessionDescription. a=sctpmap:5000 webrtc-datachannel 1024 Invalid SDP line.

这是javascript代码:

function input() {
  var stdin = document.getElementById('stdin');
  var input = stdin.value;
  stdin.value = '';
  return input;
}
function answer() {
  peerConnection = new RTCPeerConnection(pcConfig);
  peerConnection.onicecandidate = onIceCandidate;
  peerConnection.ondatachannel  = onDataChannel;
  peerConnection.oniceconnectionstatechange = onIceConnectionStateChange;
  var buff = input();
  var sdpOffer = {
    type: "offer",
    sdp: buff
  }
  peerConnection.setRemoteDescription(sdpOffer).then(() => onSetRemoteSuccess(peerConnection), onSetSessionDescriptionError);
  peerConnection.createAnswer().then(onCreateAnswerSuccess, onCreateSessionDescriptionError);
}

和示例 sdp:

v=0
o=- 8612289788290620730 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE data
a=msid-semantic: WMS
m=application 49168 DTLS/SCTP 5000
c=IN IP4 77.114.92.160
a=candidate:1774547698 1 udp 2113937151 77.114.92.160 49168 typ host generation 0 network-cost 50
a=ice-ufrag:yzpQ
a=ice-pwd:UDjI4/ifwEV4mbZnfjbJrRW1
a=ice-options:trickle
a=fingerprint:sha-256 3C:60:34:BA:24:44:36:72:10:DF:E4:8C:00:0B:C1:3D:87:12:65:4D:AC:FF:09:F2:DD:22:BD:A8:3C:90:F1:F8
a=setup:actpass
a=mid:data
a=sctpmap:5000 webrtc-datachannel 1024

两个 native 应用程序之间的连接工作正常，所以我猜问题出在 javascript 代码中。如果有任何建议，我将不胜感激。

Answer 1

在最后一行后添加一个换行符a=sctpmap:5000 webrtc-datachannel 1024