webRTC（八）：查看offer/answer 的 SDP

其他 2020-03-26 11:28:47 阅读次数: 0
  • 创建媒体
function getStream(){
	var constraints = {
		audio:true,
		video:true
	}
	navigator.mediaDevices.getUserMedia(constraints)
						  .then(getMediaStream)
						  .catch(handError);
						  
}
  • 创建媒体协商
function getMediaStream(stream){
	stream.getTracks().forEach((track)=>{
		pc.addTrack(track);	
	});
	var options={
		//
		offerToReceiveAudio:1,
		offerToReceiveVideo:1,
		//该选项会重启ICE，重新进行Candidate收集
		iceRestart:false
	}
	pc.createOffer(options)
		.then(getOffer)
		.catch(handError);
}
  • 创建 offer
function getOffer(desc){
	console.log(desc.sdp);
	pc.setLocalDescription(desc);
	pc2.setRemoteDescription(desc);
	
	pc2.createAnswer().then(getAnswer).catch(handError);
}
  • 创建answer
function getAnswer(desc){
	console.log(desc.sdp);
	pc2.setLocalDescription(desc);
	
	pc.setRemoteDescription(desc);
}

效果

  • offer的sdp
v=0
o=- 2101118154984444130 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio video
a=msid-semantic: WMS 47acc35a-4237-48a0-ae6a-3e85580756a6 d4f6e8b0-25d4-4cb8-8908-0a8cdb7fa604
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 0 8 106 105 13 110 112 113 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:7xq1
a=ice-pwd:E6bbfqYkVZ7d1gtufAN8aw3J
a=ice-options:trickle
a=fingerprint:sha-256 50:DF:63:7A:1F:84:2F:29:19:03:E5:38:17:32:5F:A1:21:B4:3A:79:38:53:4A:C6:BB:73:AB:3B:B2:70:F7:4F
a=setup:actpass
a=mid:audio
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=sendrecv
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10;useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:110 telephone-event/48000
a=rtpmap:112 telephone-event/32000
a=rtpmap:113 telephone-event/16000
a=rtpmap:126 telephone-event/8000
a=ssrc:2607611722 cname:FAqcPi+z2lLzPXYa
a=ssrc:2607611722 msid:47acc35a-4237-48a0-ae6a-3e85580756a6 05fd88c1-6fe5-4739-9300-2b15ee8108f6
a=ssrc:2607611722 mslabel:47acc35a-4237-48a0-ae6a-3e85580756a6
a=ssrc:2607611722 label:05fd88c1-6fe5-4739-9300-2b15ee8108f6
m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 102 122 127 121 125 107 108 109 124 120 123 119 114
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:7xq1
a=ice-pwd:E6bbfqYkVZ7d1gtufAN8aw3J
a=ice-options:trickle
a=fingerprint:sha-256 50:DF:63:7A:1F:84:2F:29:19:03:E5:38:17:32:5F:A1:21:B4:3A:79:38:53:4A:C6:BB:73:AB:3B:B2:70:F7:4F
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=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type
a=extmap:8 http://www.webrtc.org/experiments/rtp-hdrext/video-timing
a=sendrecv
a=rtcp-mux
a=rtcp-rsize
a=rtpmap:96 VP8/90000
a=rtcp-fb:96 goog-remb
a=rtcp-fb:96 transport-cc
a=rtcp-fb:96 ccm fir
a=rtcp-fb:96 nack
a=rtcp-fb:96 nack pli
a=rtpmap:97 rtx/90000
a=fmtp:97 apt=96
a=rtpmap:98 VP9/90000
a=rtcp-fb:98 goog-remb
a=rtcp-fb:98 transport-cc
a=rtcp-fb:98 ccm fir
a=rtcp-fb:98 nack
a=rtcp-fb:98 nack pli
a=fmtp:98 x-google-profile-id=0
a=rtpmap:99 rtx/90000
a=fmtp:99 apt=98
a=rtpmap:100 H264/90000
a=rtcp-fb:100 goog-remb
a=rtcp-fb:100 transport-cc
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 nack pli
a=fmtp:100 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42001f
a=rtpmap:101 rtx/90000
a=fmtp:101 apt=100
a=rtpmap:102 H264/90000
a=rtcp-fb:102 goog-remb
a=rtcp-fb:102 transport-cc
a=rtcp-fb:102 ccm fir
a=rtcp-fb:102 nack
a=rtcp-fb:102 nack pli
a=fmtp:102 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42001f
a=rtpmap:122 rtx/90000
a=fmtp:122 apt=102
a=rtpmap:127 H264/90000
a=rtcp-fb:127 goog-remb
a=rtcp-fb:127 transport-cc
a=rtcp-fb:127 ccm fir
a=rtcp-fb:127 nack
a=rtcp-fb:127 nack pli
a=fmtp:127 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
a=rtpmap:121 rtx/90000
a=fmtp:121 apt=127
a=rtpmap:125 H264/90000
a=rtcp-fb:125 goog-remb
a=rtcp-fb:125 transport-cc
a=rtcp-fb:125 ccm fir
a=rtcp-fb:125 nack
a=rtcp-fb:125 nack pli
a=fmtp:125 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f
a=rtpmap:107 rtx/90000
a=fmtp:107 apt=125
a=rtpmap:108 H264/90000
a=rtcp-fb:108 goog-remb
a=rtcp-fb:108 transport-cc
a=rtcp-fb:108 ccm fir
a=rtcp-fb:108 nack
a=rtcp-fb:108 nack pli
a=fmtp:108 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=4d0032
a=rtpmap:109 rtx/90000
a=fmtp:109 apt=108
a=rtpmap:124 H264/90000
a=rtcp-fb:124 goog-remb
a=rtcp-fb:124 transport-cc
a=rtcp-fb:124 ccm fir
a=rtcp-fb:124 nack
a=rtcp-fb:124 nack pli
a=fmtp:124 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640032
a=rtpmap:120 rtx/90000
a=fmtp:120 apt=124
a=rtpmap:123 red/90000
a=rtpmap:119 rtx/90000
a=fmtp:119 apt=123
a=rtpmap:114 ulpfec/90000
a=ssrc-group:FID 3742035796 1130647485
a=ssrc:3742035796 cname:FAqcPi+z2lLzPXYa
a=ssrc:3742035796 msid:d4f6e8b0-25d4-4cb8-8908-0a8cdb7fa604 c3107fbf-bb10-4a9e-8188-fe356636e2a5
a=ssrc:3742035796 mslabel:d4f6e8b0-25d4-4cb8-8908-0a8cdb7fa604
a=ssrc:3742035796 label:c3107fbf-bb10-4a9e-8188-fe356636e2a5
a=ssrc:1130647485 cname:FAqcPi+z2lLzPXYa
a=ssrc:1130647485 msid:d4f6e8b0-25d4-4cb8-8908-0a8cdb7fa604 c3107fbf-bb10-4a9e-8188-fe356636e2a5
a=ssrc:1130647485 mslabel:d4f6e8b0-25d4-4cb8-8908-0a8cdb7fa604
a=ssrc:1130647485 label:c3107fbf-bb10-4a9e-8188-fe356636e2a5
  • answer的sdp
v=0
o=- 5774749671480282566 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio video
a=msid-semantic: WMS
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 0 8 106 105 13 110 112 113 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:XTpb
a=ice-pwd:QNFmVMKggS8kNE3lcvoV3xGl
a=ice-options:trickle
a=fingerprint:sha-256 07:D7:40:64:2F:5D:7D:05:42:30:D8:25:C4:F7:A1:38:C8:B3:5E:E4:03:AF:2C:AD:A3:C3:11:82:4F:F2:71:76
a=setup:active
a=mid:audio
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=recvonly
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10;useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:110 telephone-event/48000
a=rtpmap:112 telephone-event/32000
a=rtpmap:113 telephone-event/16000
a=rtpmap:126 telephone-event/8000
m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 102 122 127 121 125 107 108 109 124 120 123 119 114
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:XTpb
a=ice-pwd:QNFmVMKggS8kNE3lcvoV3xGl
a=ice-options:trickle
a=fingerprint:sha-256 07:D7:40:64:2F:5D:7D:05:42:30:D8:25:C4:F7:A1:38:C8:B3:5E:E4:03:AF:2C:AD:A3:C3:11:82:4F:F2:71:76
a=setup:active
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=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type
a=extmap:8 http://www.webrtc.org/experiments/rtp-hdrext/video-timing
a=recvonly
a=rtcp-mux
a=rtcp-rsize
a=rtpmap:96 VP8/90000
a=rtcp-fb:96 goog-remb
a=rtcp-fb:96 transport-cc
a=rtcp-fb:96 ccm fir
a=rtcp-fb:96 nack
a=rtcp-fb:96 nack pli
a=rtpmap:97 rtx/90000
a=fmtp:97 apt=96
a=rtpmap:98 VP9/90000
a=rtcp-fb:98 goog-remb
a=rtcp-fb:98 transport-cc
a=rtcp-fb:98 ccm fir
a=rtcp-fb:98 nack
a=rtcp-fb:98 nack pli
a=fmtp:98 x-google-profile-id=0
a=rtpmap:99 rtx/90000
a=fmtp:99 apt=98
a=rtpmap:100 H264/90000
a=rtcp-fb:100 goog-remb
a=rtcp-fb:100 transport-cc
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 nack pli
a=fmtp:100 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42001f
a=rtpmap:101 rtx/90000
a=fmtp:101 apt=100
a=rtpmap:102 H264/90000
a=rtcp-fb:102 goog-remb
a=rtcp-fb:102 transport-cc
a=rtcp-fb:102 ccm fir
a=rtcp-fb:102 nack
a=rtcp-fb:102 nack pli
a=fmtp:102 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42001f
a=rtpmap:122 rtx/90000
a=fmtp:122 apt=102
a=rtpmap:127 H264/90000
a=rtcp-fb:127 goog-remb
a=rtcp-fb:127 transport-cc
a=rtcp-fb:127 ccm fir
a=rtcp-fb:127 nack
a=rtcp-fb:127 nack pli
a=fmtp:127 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
a=rtpmap:121 rtx/90000
a=fmtp:121 apt=127
a=rtpmap:125 H264/90000
a=rtcp-fb:125 goog-remb
a=rtcp-fb:125 transport-cc
a=rtcp-fb:125 ccm fir
a=rtcp-fb:125 nack
a=rtcp-fb:125 nack pli
a=fmtp:125 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f
a=rtpmap:107 rtx/90000
a=fmtp:107 apt=125
a=rtpmap:108 H264/90000
a=rtcp-fb:108 goog-remb
a=rtcp-fb:108 transport-cc
a=rtcp-fb:108 ccm fir
a=rtcp-fb:108 nack
a=rtcp-fb:108 nack pli
a=fmtp:108 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=4d0032
a=rtpmap:109 rtx/90000
a=fmtp:109 apt=108
a=rtpmap:124 H264/90000
a=rtcp-fb:124 goog-remb
a=rtcp-fb:124 transport-cc
a=rtcp-fb:124 ccm fir
a=rtcp-fb:124 nack
a=rtcp-fb:124 nack pli
a=fmtp:124 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640032
a=rtpmap:120 rtx/90000
a=fmtp:120 apt=124
a=rtpmap:123 red/90000
a=rtpmap:119 rtx/90000
a=fmtp:119 apt=123
a=rtpmap:114 ulpfec/90000

测试地址：https://www.huangxiaoguo.club/testCreateOffer/index.html

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