[Webkit-unassigned] [Bug 173458] The createOffer method don't generates a blob of SDP wthitout the addStream method(Safari 11.0).

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173458

--- Comment #3 from lwu <wglu521 at 163.com> ---
(In reply to youenn fablet from comment #2)
> WebKit is not supporting  offerToReceiveAudio: false and
> offerToReceiveVideo: true.
> Instead, one can use addTransceiver instead.
> Can you try that and see whether that works for you with the latest
> SafariTechPreview?


Thanks for your reply, I tyr it.


Steps to Reproduce:
Step 1 :
        var pc1 = new RTCPeerConnection();

Step 2 :
        pc1.onicecandidate = function(e) {
                 if (event.candidate) {
                        pc1.addIceCandidate(new RTCIceCandidate(event.candidate)
                        ).then(
                          function() {
                                   console.log('pc1 addIceCandidate success');
                          },
                          function(err) {
                                    console.log('pc1 failed to add ICE Candidate: ' + error.toString() );
                           }
                         );
                         console.log('pc1 ICE candidate: \n' + event.candidate.candidate);
                 }
         };

         pc1.addTransceiver("video");

         pc1.createOffer().then(
                onCreateOfferSuccess,
               onCreateSessionDescriptionError
         );

Step 3 :
        function onCreateOfferSuccess(desc) {
                console.log('Offer from pc1\n' + desc.sdp);
                 ...  //omit following method
        }
        function onCreateSessionDescriptionError(desc) {
                console.log('pc1 Failed to create session description: ' + error.toString());
                 ...  //omit following method
        }


In step 3, onCreateOfferSuccess function prints: 

Offer from pc1
v=0
o=- 1206206593124710074 2 IN IP4 127.0.0.1
s=-
t=0 0
a=msid-semantic: WMS



It doesn't seem to work as well when I do it. 
So, I viewed the source code of Webkit.
I found that the Webkit does not provide the js API.

File path:   webkit/Source/ThirdParty/libwebrtc/Source/webrtc/api/peerconnectioninterface.h

Line: 550

Notes:

// Creates a sender without a track. Can be used for "early media"/"warmup"
  // use cases, where the application may want to negotiate video attributes
  // before a track is available to send.
  //
  // The standard way to do this would be through "addTransceiver", but we
  // don't support that API yet.
  //
  // |kind| must be "audio" or "video".
  //
  // |stream_id| is used to populate the msid attribute; if empty, one will
  // be generated automatically.

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