PSA: PeerConnection.createAnswer will now check signaling state

[steve...@webrtc.org]

Hi,

PeerConnection.createAnswer will now fail if the signaling state is not 'have-remote-offer' or 'have-local-pranswer', in accordance with the WebRTC specification. This will affect the PeerConnection API on all platforms (C++, Javascript, Java, Objective C). Currently it looks like it will reach Chrome in M66.

Most uses of PeerConnection should not be affected since createAnswer is only called once in the normal signaling flow.

An affected case: Some applications use a second call to createAnswer after ICE gathering has completed to get an answer with all the local ICE candidates. This will no longer work since createAnswer cannot be called after setLocalDescription with an answer (the signaling state will be 'stable'). The fix is to look at the answerer's localDescription which is identical to the created answer and will have been updated with all the gathered ICE candidates.

Best,

Steve

[harshendra singh]

I am still getting the error can you please help me on this

[harshendra singh]

please help me on this  below is my code.

signallingServer.onGuestJoined = function() {

//onGuestJoined  is workin properly

        trace('guest joined!')

//called when partner joind the call

        // set local description and send to remote

        localPeerConnection.createOffer(function(sessionDescription) {

            trace('set local session desc with offer');

            localPeerConnection.setLocalDescription(sessionDescription);

           //

            //localPeerConnection.setRemoteDescription(sessionDescription);

            // send local sdp to remote

            signallingServer.sendSDP(sessionDescription);

        });

    }

    // got sdp from remote

    signallingServer.onReceiveSdp = function(sdp) {

        // get stream again

debugger;

        localPeerConnection.addStream(localStream);

        trace(localStream)

        // if local was the caller, set remote desc

        if (localIsCaller) {

            trace('is caller');

            trace('set remote session desc with answer');

            localPeerConnection.setRemoteDescription(new RTCSessionDescription(

                sdp));

        }

        // if local is joining a call, set remote sdp and create answer

        else {

            trace('set remote session desc with offer');

          

            localPeerConnection.setRemoteDescription(new RTCSessionDescription(

                sdp), function() {

                    trace('make answer')

                   // console.log(sdp);

                localPeerConnection.createAnswer(function(sessionDescription) {

//call is not getting inside error DOMException: CreateAnswer called with invalid media streams

                    // set local description

                    trace('set local session desc with answer');

                    localPeerConnection.setLocalDescription(

                        sessionDescription);

                    // send local sdp to remote too

                    signallingServer.sendSDP(sessionDescription);

                }, function (e) {

                    console.log("Could not set remote description. Reason: " + e);

                });

                });