添加offer simulcast sdp

webrtc/offer-simulcast.sdp

+# chrome的sdp
 v=0
-o=- 99044479296054817 2 IN IP4 127.0.0.1
+o=- 403371946498103831 2 IN IP4 127.0.0.1
 s=-
 t=0 0
 a=group:BUNDLE 0 1
@@ -8,10 +9,10 @@ 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:s95k
-a=ice-pwd:JFAzK9rInMLPOosVj4Z7lC+Q
+a=ice-ufrag:pW4Z
+a=ice-pwd:S38S++HW3eTcPTyytsNI1XVp
 a=ice-options:trickle
-a=fingerprint:sha-256 50:76:BB:FA:A8:D3:B7:19:81:C7:8D:19:60:C7:A9:7E:0E:5F:AA:3F:FE:68:60:98:B1:93:95:BC:A9:29:E4:D1
+a=fingerprint:sha-256 04:32:7B:56:7D:F7:D4:EC:65:7C:04:6C:F8:0B:03:F0:35:A9:1A:C3:43:3E:18:95:67:E6:0D:D1:EE:C9:16:8C
 a=setup:actpass
 a=mid:0
 a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
@@ -21,7 +22,7 @@ a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid
 a=extmap:5 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
 a=extmap:6 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
 a=sendrecv
-a=msid:- 83e7b60d-ce8f-4d7d-a7b9-d2209747bf55
+a=msid:- a3c6a137-1291-45cd-b985-07a9bd365452
 a=rtcp-mux
 a=rtpmap:111 opus/48000/2
 a=rtcp-fb:111 transport-cc
@@ -38,17 +39,17 @@ 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:1320289824 cname:YOYQAT5W3y5SSliB
-a=ssrc:1320289824 msid:- 83e7b60d-ce8f-4d7d-a7b9-d2209747bf55
-a=ssrc:1320289824 mslabel:-
-a=ssrc:1320289824 label:83e7b60d-ce8f-4d7d-a7b9-d2209747bf55
-m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 102 121 127 120 125 107 108 109 124 119 123 118 114 115 116
+a=ssrc:3626257331 cname:JSFJMbaE9Pu5tevN
+a=ssrc:3626257331 msid:- a3c6a137-1291-45cd-b985-07a9bd365452
+a=ssrc:3626257331 mslabel:-
+a=ssrc:3626257331 label:a3c6a137-1291-45cd-b985-07a9bd365452
+m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 102 121 127 120 125 107 108 109 35 36 124 119 123 118 114 115 116
 c=IN IP4 0.0.0.0
 a=rtcp:9 IN IP4 0.0.0.0
-a=ice-ufrag:s95k
-a=ice-pwd:JFAzK9rInMLPOosVj4Z7lC+Q
+a=ice-ufrag:pW4Z
+a=ice-pwd:S38S++HW3eTcPTyytsNI1XVp
 a=ice-options:trickle
-a=fingerprint:sha-256 50:76:BB:FA:A8:D3:B7:19:81:C7:8D:19:60:C7:A9:7E:0E:5F:AA:3F:FE:68:60:98:B1:93:95:BC:A9:29:E4:D1
+a=fingerprint:sha-256 04:32:7B:56:7D:F7:D4:EC:65:7C:04:6C:F8:0B:03:F0:35:A9:1A:C3:43:3E:18:95:67:E6:0D:D1:EE:C9:16:8C
 a=setup:actpass
 a=mid:1
 a=extmap:14 urn:ietf:params:rtp-hdrext:toffset
@@ -63,7 +64,7 @@ a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid
 a=extmap:5 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
 a=extmap:6 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
 a=sendrecv
-a=msid:- cd8e4810-dadf-4f11-8799-eed2560fe196
+a=msid:- 261e5384-9cf6-479d-9d59-aaf924d1a2ea
 a=rtcp-mux
 a=rtcp-rsize
 a=rtpmap:96 VP8/90000
@@ -128,6 +129,14 @@ a=rtcp-fb:108 nack pli
 a=fmtp:108 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f
 a=rtpmap:109 rtx/90000
 a=fmtp:109 apt=108
+a=rtpmap:35 AV1X/90000
+a=rtcp-fb:35 goog-remb
+a=rtcp-fb:35 transport-cc
+a=rtcp-fb:35 ccm fir
+a=rtcp-fb:35 nack
+a=rtcp-fb:35 nack pli
+a=rtpmap:36 rtx/90000
+a=fmtp:36 apt=35
 a=rtpmap:124 H264/90000
 a=rtcp-fb:124 goog-remb
 a=rtcp-fb:124 transport-cc
@@ -153,4 +162,94 @@ a=rtpmap:116 ulpfec/90000
 a=rid:q send
 a=rid:h send
 a=rid:f send
-a=simulcast:send q;h;f
\ No newline at end of file
+a=simulcast:send q;h;f
+
+#firefox的sdp
+v=0
+o=mozilla...THIS_IS_SDPARTA-88.0.1 3954544078885279475 0 IN IP4 0.0.0.0
+s=-
+t=0 0
+a=fingerprint:sha-256 9B:4F:D1:D2:A5:ED:08:BC:E8:D7:DD:D8:59:2C:E6:3D:19:F9:4C:67:9C:D9:9B:7B:C9:47:7A:3A:1F:05:C8:96
+a=group:BUNDLE 0 1
+a=ice-options:trickle
+a=msid-semantic:WMS *
+m=audio 9 UDP/TLS/RTP/SAVPF 109 9 0 8 101
+c=IN IP4 0.0.0.0
+a=sendrecv
+a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
+a=extmap:2/recvonly urn:ietf:params:rtp-hdrext:csrc-audio-level
+a=extmap:3 urn:ietf:params:rtp-hdrext:sdes:mid
+a=fmtp:109 maxplaybackrate=48000;stereo=1;useinbandfec=1
+a=fmtp:101 0-15
+a=ice-pwd:92a9ced6d734f7ff2a45cde8b29572a9
+a=ice-ufrag:b986b945
+a=mid:0
+a=msid:- {ea61729a-c244-4c79-aeb7-b57765fefa26}
+a=rtcp-mux
+a=rtpmap:109 opus/48000/2
+a=rtpmap:9 G722/8000/1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:8 PCMA/8000
+a=rtpmap:101 telephone-event/8000/1
+a=setup:actpass
+a=ssrc:3000327501 cname:{12e7c547-559e-46e2-94db-f1ad474c95dc}
+m=video 9 UDP/TLS/RTP/SAVPF 120 124 121 125 126 127 97 98
+c=IN IP4 0.0.0.0
+a=sendrecv
+a=extmap:3 urn:ietf:params:rtp-hdrext:sdes:mid
+a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
+a=extmap:5 urn:ietf:params:rtp-hdrext:toffset
+a=extmap:6/recvonly http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
+a=extmap:7 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
+a=extmap:8/sendonly urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
+a=extmap:9/sendonly urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
+a=fmtp:126 profile-level-id=42e01f;level-asymmetry-allowed=1;packetization-mode=1
+a=fmtp:97 profile-level-id=42e01f;level-asymmetry-allowed=1
+a=fmtp:120 max-fs=12288;max-fr=60
+a=fmtp:124 apt=120
+a=fmtp:121 max-fs=12288;max-fr=60
+a=fmtp:125 apt=121
+a=fmtp:127 apt=126
+a=fmtp:98 apt=97
+a=ice-pwd:92a9ced6d734f7ff2a45cde8b29572a9
+a=ice-ufrag:b986b945
+a=mid:1
+a=msid:- {3bfe1b80-20eb-4b42-b8b7-fac45fb281bf}
+a=rid:q send
+a=rid:h send
+a=rid:f send
+a=rtcp-fb:120 nack
+a=rtcp-fb:120 nack pli
+a=rtcp-fb:120 ccm fir
+a=rtcp-fb:120 goog-remb
+a=rtcp-fb:120 transport-cc
+a=rtcp-fb:121 nack
+a=rtcp-fb:121 nack pli
+a=rtcp-fb:121 ccm fir
+a=rtcp-fb:121 goog-remb
+a=rtcp-fb:121 transport-cc
+a=rtcp-fb:126 nack
+a=rtcp-fb:126 nack pli
+a=rtcp-fb:126 ccm fir
+a=rtcp-fb:126 goog-remb
+a=rtcp-fb:126 transport-cc
+a=rtcp-fb:97 nack
+a=rtcp-fb:97 nack pli
+a=rtcp-fb:97 ccm fir
+a=rtcp-fb:97 goog-remb
+a=rtcp-fb:97 transport-cc
+a=rtcp-mux
+a=rtcp-rsize
+a=rtpmap:120 VP8/90000
+a=rtpmap:124 rtx/90000
+a=rtpmap:121 VP9/90000
+a=rtpmap:125 rtx/90000
+a=rtpmap:126 H264/90000
+a=rtpmap:127 rtx/90000
+a=rtpmap:97 H264/90000
+a=rtpmap:98 rtx/90000
+a=setup:actpass
+a=simulcast:send q;h;f
+a=ssrc:2581133096 cname:{12e7c547-559e-46e2-94db-f1ad474c95dc}
+a=ssrc:773854125 cname:{12e7c547-559e-46e2-94db-f1ad474c95dc}
+a=ssrc:4100728001 cname:{12e7c547-559e-46e2-94db-f1ad474c95dc}