I am trying webRTC video call between iPhone devices. One application is creating the offer SDP as below. When i tried to set this SDP, am getting error in another application as
Error Domain=org.webrtc.RTCPeerConnection Code=-1 "Failed to set remote offer sdp: Failed to set remote video description send parameters." UserInfo={NSLocalizedDescription=Failed to set remote offer sdp: Failed to set remote video description send parameters.}
Following is the code used to set the offer and create the answer. The second line self.peerConnection?.setRemoteDescription throws error.
let sessionDescription = RTCSessionDescription(type: .offer, sdp: remoteSdp)
self.peerConnection?.setRemoteDescription(sessionDescription, completionHandler: { [weak self] (error) in
guard let this = self else { return }
if let error = error {
this.delegate?.webrtcClient(client: this, didReceiveError: error)
} else {
this.handleRemoteDescriptionSet()
// create answer
peerConnection.answer(for: this.callConstraint, completionHandler:
{ (sdp, error) in
if let error = error {
this.delegate?.webrtcClient(client: this, didReceiveError: error)
} else {
this.handleSdpGenerated(sdpDescription: sdp)
}
})
}
})
Following is the Offer SDP format
v=0
o=- 271054486825926104 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE video
a=msid-semantic: WMS ARDAMS
m=video 9 UDP/TLS/RTP/SAVPF 100 101 116 117 96
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:mwCLNm7ZLzmDrtCu
a=ice-pwd:+alfGXoarzyKjISWRYAGyIH4
a=fingerprint:sha-256 44:0D:11:54:EC:62:CD:51:D0:E3:BB:A5:47:35:D1:27:48:4E:08:3B:AD:98:72:98:02:BA:06:C8:CC:12:0E:C0
a=setup:actpass
a=mid:video
a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:4 urn:3gpp:video-orientation
a=sendrecv
a=rtcp-mux
a=rtpmap:100 VP8/90000
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 nack pli
a=rtcp-fb:100 goog-remb
a=rtpmap:101 VP9/90000
a=rtcp-fb:101 ccm fir
a=rtcp-fb:101 nack
a=rtcp-fb:101 nack pli
a=rtcp-fb:101 goog-remb
a=rtpmap:116 red/90000
a=rtpmap:117 ulpfec/90000
a=rtpmap:96 rtx/90000
a=fmtp:96 apt=100
a=ssrc-group:FID 1767367305 3714792746
a=ssrc:1767367305 cname:9wPGj45IHVxtvO6N
a=ssrc:1767367305 msid:ARDAMS ARDAMSv0
a=ssrc:1767367305 mslabel:ARDAMS
a=ssrc:1767367305 label:ARDAMSv0
a=ssrc:3714792746 cname:9wPGj45IHVxtvO6N
a=ssrc:3714792746 msid:ARDAMS ARDAMSv0
a=ssrc:3714792746 mslabel:ARDAMS
a=ssrc:3714792746 label:ARDAMSv0
