android 使用googlewebrtc创建的offer中没有a=fingerprint、a=setup:actpass两个字段,是什么原因呢

googleWebrtc 工厂的初始化方法
PeerConnectionFactory.InitializationOptions initializationOptions = PeerConnectionFactory.InitializationOptions.builder(this)
.setEnableInternalTracer(true)
.setFieldTrials(“WebRTC-H264HighProfile/Enabled/”)
.createInitializationOptions();
PeerConnectionFactory.initialize(initializationOptions);

webrtc 工厂初始化方法
PeerConnectionFactory.initializeAndroidGlobals(this, true, true, true);
mPeerConnectionFactory = new PeerConnectionFactory();

googleWebRTC 创建的offer---------------------------------------

v=0

o=- 5214625093045496668 2 IN IP4 127.0.0.1

s=-

t=0 0

a=group:BUNDLE audio video

a=msid-semantic: WMS 385b4705-4ef2-4562-aad4-da1f874c58a7 ARDAMS

m=audio 9 RTP/AVPF 111 103 104 9 102 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:6ORH

a=ice-pwd:5EblKNZHt16IIuBwHqsDvSi/

a=ice-options:trickle renomination

a=mid:audio

a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level

a=extmap:2 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01

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:102 ILBC/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:1868122111 cname:1okq0Th9uUy+0/ma

a=ssrc:1868122111 msid:385b4705-4ef2-4562-aad4-da1f874c58a7 ARDAMSa0

a=ssrc:1868122111 mslabel:385b4705-4ef2-4562-aad4-da1f874c58a7

a=ssrc:1868122111 label:ARDAMSa0

m=video 9 RTP/AVPF 96 97 98 99 100 101 127 124 125

c=IN IP4 0.0.0.0

a=rtcp:9 IN IP4 0.0.0.0

a=ice-ufrag:6ORH

a=ice-pwd:5EblKNZHt16IIuBwHqsDvSi/

a=ice-options:trickle renomination

a=mid:video

a=extmap:14 urn:ietf:params:rtp-hdrext:toffset

a=extmap:13 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time

a=extmap:3 urn:3gpp:video-orientation

a=extmap:2 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01

a=extmap:5 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay

a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type

a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-timing

a=extmap:8 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07

a=extmap:9 http://www.webrtc.org/experiments/rtp-hdrext/color-space

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=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=42e01f

a=rtpmap:101 rtx/90000

a=fmtp:101 apt=100

a=rtpmap:127 red/90000

a=rtpmap:124 rtx/90000

a=fmtp:124 apt=127

a=rtpmap:125 ulpfec/90000

a=ssrc-group:FID 1589665288 1345789616

a=ssrc:1589665288 cname:1okq0Th9uUy+0/ma

a=ssrc:1589665288 msid:ARDAMS ARDAMSv0

a=ssrc:1589665288 mslabel:ARDAMS

a=ssrc:1589665288 label:ARDAMSv0

a=ssrc:1345789616 cname:1okq0Th9uUy+0/ma

a=ssrc:1345789616 msid:ARDAMS ARDAMSv0

a=ssrc:1345789616 mslabel:ARDAMS

a=ssrc:1345789616 label:ARDAMSv0

WebRTC 创建的offer---------------------------------------

v=0

o=- 9089268646396401588 2 IN IP4 127.0.0.1

s=-

t=0 0

a=group:BUNDLE audio video

a=msid-semantic: WMS localAudioStream localVideoStream

m=audio 9 UDP/TLS/RTP/SAVPF 111 103 9 102 0 8 106 105 13 127 126

c=IN IP4 0.0.0.0

a=rtcp:9 IN IP4 0.0.0.0

a=ice-ufrag:zZo0BAIbuB2Q11aL

a=ice-pwd:zZ8L9v6QJ3mxJm//LPfAxcuy

a=fingerprint:sha-256 6F:3F:7B:A6:77:91:30:A2:F1:36:B3:AC:D1:F8:83:11:D0:B6:D6:90:52:C7:D5:22:17:53:F3:ED:DC:62:38:10

a=setup:actpass

a=mid:audio

a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level

a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time

a=sendrecv

a=rtcp-mux

a=rtpmap:111 opus/48000/2

a=fmtp:111 minptime=10; useinbandfec=1

a=rtpmap:103 ISAC/16000

a=rtpmap:9 G722/8000

a=rtpmap:102 ILBC/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:127 red/8000

a=rtpmap:126 telephone-event/8000

a=maxptime:60

a=ssrc:3896686477 cname:xlVZJYw2qoY5lOJt

a=ssrc:3896686477 msid:localAudioStream audiotrack

a=ssrc:3896686477 mslabel:localAudioStream

a=ssrc:3896686477 label:audiotrack

m=video 9 UDP/TLS/RTP/SAVPF 100 101 116 117 121 96

c=IN IP4 0.0.0.0

a=rtcp:9 IN IP4 0.0.0.0

a=ice-ufrag:zZo0BAIbuB2Q11aL

a=ice-pwd:zZ8L9v6QJ3mxJm//LPfAxcuy

a=fingerprint:sha-256 6F:3F:7B:A6:77:91:30:A2:F1:36:B3:AC:D1:F8:83:11:D0:B6:D6:90:52:C7:D5:22:17:53:F3:ED:DC:62:38:10

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=rtcp-fb:100 transport-cc

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=rtcp-fb:101 transport-cc

a=rtpmap:116 red/90000

a=rtpmap:117 ulpfec/90000

a=rtpmap:121 H264/90000

a=rtcp-fb:121 ccm fir

a=rtcp-fb:121 nack

a=rtcp-fb:121 nack pli

a=rtcp-fb:121 goog-remb

a=rtcp-fb:121 transport-cc

a=rtpmap:96 rtx/90000

a=fmtp:96 apt=100

a=ssrc-group:FID 260068902 1169623232

a=ssrc:260068902 cname:9DSIIUxzf/bytyyf

a=ssrc:260068902 msid:localVideoStream videtrack

a=ssrc:260068902 mslabel:localVideoStream

a=ssrc:260068902 label:videtrack

a=ssrc:1169623232 cname:9DSIIUxzf/bytyyf

a=ssrc:1169623232 msid:localVideoStream videtrack

a=ssrc:1169623232 mslabel:localVideoStream

a=ssrc:1169623232 label:videtrack