全面解析 RTCPeerConnection 的 iceTransportPolicy 配置

最编程 2024-08-07 08:10:18

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介绍

RTCConfiguration.iceTransportPolicy 定义了 ICE 候选策略，浏览器使用该策略向应用程序显示允许的候选者，只有这些候选项将用于连接检查。

const pc = new RTCPeerConnection({ iceTransportPolicy: 'all' });

注意：ICE 代理候选项有四类，主机候选项、服务器反射候选项、对等反射候选项和中继候选项。

枚举值说明

all（默认值）：ICE 代理使用所有类型的候选对象进行连接检查。此时四种候选都会做尝试。

relay：ICE 代理只使用媒体中继候选者，如经过 TURN 服务器的候选项。

验证环境

内网里面一台 Janus 服务器，同时使用内网中的电脑进行访问。

TURN server 和 Janus 服务器在同一台设备上，通过内网穿透的云服务将 UDP 3487 端口映射到公网，映射的结果是 free.svipss.top:51351（121.199.22.135:51351）。

Janus 服务器地址：192.168.100.221
浏览器所在电脑地址：192.168.100.108
TURN server 地址：192.168.100.221，映射后地址端口：free.svipss.top:51351

TURN server 使用 coturn 搭建，配置文件如下：

# TURN server name and realm
realm=192.168.100.221
server-name=turnserver

# Use fingerprint in TURN message
fingerprint

# IPs the TURN server listens to
# listening-ip=192.168.10.221

# External IP-Address of the TURN server
#external-ip=121.199.22.135

# Main listening port
listening-port=3478

# Further ports that are open for communication
min-port=20000
max-port=22000

# Enable verbose logging
verbose

# Specify the user for the TURN authentification
user=test:123456

# Enable long-term credential mechanism
lt-cred-mech

对比结果

主要差异在浏览器 onicecandidate 上报的 candidate 信息中有所不同。

使用 all 的情况下，浏览器 onicecandidate 上报的 candidate 信息中包含五个候选项

candidate:173396259 1 udp 2122260223 172.30.192.1 59765 typ host generation 0 ufrag 7+eD network-id 1
candidate:1497262264 1 udp 2122194687 192.168.100.108 59766 typ host generation 0 ufrag 7+eD network-id 2
candidate:1154887123 1 tcp 1518280447 172.30.192.1 9 typ host tcptype active generation 0 ufrag 7+eD network-id 1
candidate:398300232 1 tcp 1518214911 192.168.100.108 9 typ host tcptype active generation 0 ufrag 7+eD network-id 2
candidate:821307257 1 udp 1685987071 192.168.100.108 55506 typ srflx raddr 192.168.100.108 rport 59766 generation 0 ufrag 7+eD network-id 2

使用 relay 的情况下，浏览器 onicecandidate 上报的 candidate 信息中只有一个候选项

candidate:3363055999 1 udp 41819903 192.168.100.221 20522 typ relay raddr 0.0.0.0 rport 0 generation 0 ufrag 5Kjh network-id 2

疑问：为啥使用 all 时未获取到 relay 候选项？？？

信令及网络抓包文件备份位置

链接: pan.baidu.com/s/1OldaPtfG…

提取码: s58r

复制这段内容后打开百度网盘手机App，操作更方便哦

信令分析

all

初始化代码

    const pc = new RTCPeerConnection({
      iceServers: [
        {
          urls: ['turn:free.svipss.top:51351'],
          username: 'test',
          credential: '123456',
          credentialType: 'password',
        },
      ],
      iceTransportPolicy: 'all',
      iceCandidatePoolSize: '0',
      bundlePolicy: 'max-bundle',
      rtcpMuxPolicy: 'require',
      tcpCandidatePolicy: 'disable',
      IceTransportsType: 'nohost',
    });

浏览器 onicecandidate 上报的 candidate 信息

candidate:173396259 1 udp 2122260223 172.30.192.1 59765 typ host generation 0 ufrag 7+eD network-id 1
candidate:1497262264 1 udp 2122194687 192.168.100.108 59766 typ host generation 0 ufrag 7+eD network-id 2
candidate:1154887123 1 tcp 1518280447 172.30.192.1 9 typ host tcptype active generation 0 ufrag 7+eD network-id 1
candidate:398300232 1 tcp 1518214911 192.168.100.108 9 typ host tcptype active generation 0 ufrag 7+eD network-id 2
candidate:821307257 1 udp 1685987071 192.168.100.108 55506 typ srflx raddr 192.168.100.108 rport 59766 generation 0 ufrag 7+eD network-id 2

Janus 传输过来的 candidate

candidate:1 1 udp 2013266431 192.168.100.221 20651 typ host
candidate:4 1 udp 1677722111 36.17.176.200 26569 typ srflx raddr 192.168.100.221 rport 20651

浏览器上报的 offer sdp

v=0
o=- 5247939015171769789 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE 0 1
a=extmap-allow-mixed
a=msid-semantic: WMS mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU
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:7+eD
a=ice-pwd:3+VGTgzV7gkUlIdpnWAkWqBo
a=ice-options:trickle
a=fingerprint:sha-256 BA:A3:B8:06:91:1D:69:7A:C9:46:58:B1:A7:A5:E1:C6:F7:16:86:71:71:8F:2C:27:D9:95:89:FA:7A:A7:FA:79
a=setup:actpass
a=mid:0
a=extmap:1 urn:ietf:params:rtp-hdrext:toffset
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:3 urn:3gpp:video-orientation
a=extmap:4 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://www.webrtc.org/experiments/rtp-hdrext/color-space
a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
a=sendonly
a=msid:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU 72421008-3d5b-41ca-b4c8-50a0ed51a76b
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 profile-id=0
a=rtpmap:99 rtx/90000
a=fmtp:99 apt=98
a=rtpmap:100 VP9/90000
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 profile-id=2
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=1;profile-level-id=42001f
a=rtpmap:121 rtx/90000
a=fmtp:121 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=0;profile-level-id=42001f
a=rtpmap:120 rtx/90000
a=fmtp:120 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=1;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=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
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=4d001f
a=rtpmap:119 rtx/90000
a=fmtp:119 apt=124
a=rtpmap:123 H264/90000
a=rtcp-fb:123 goog-remb
a=rtcp-fb:123 transport-cc
a=rtcp-fb:123 ccm fir
a=rtcp-fb:123 nack
a=rtcp-fb:123 nack pli
a=fmtp:123 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=64001f
a=rtpmap:118 rtx/90000
a=fmtp:118 apt=123
a=rtpmap:114 red/90000
a=rtpmap:115 rtx/90000
a=fmtp:115 apt=114
a=rtpmap:116 ulpfec/90000
a=ssrc-group:FID 380787905 4099067239
a=ssrc:380787905 cname:VY2dNUk0w4Gmvv8S
a=ssrc:380787905 msid:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU 72421008-3d5b-41ca-b4c8-50a0ed51a76b
a=ssrc:380787905 mslabel:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU
a=ssrc:380787905 label:72421008-3d5b-41ca-b4c8-50a0ed51a76b
a=ssrc:4099067239 cname:VY2dNUk0w4Gmvv8S
a=ssrc:4099067239 msid:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU 72421008-3d5b-41ca-b4c8-50a0ed51a76b
a=ssrc:4099067239 mslabel:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU
a=ssrc:4099067239 label:72421008-3d5b-41ca-b4c8-50a0ed51a76b
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:7+eD
a=ice-pwd:3+VGTgzV7gkUlIdpnWAkWqBo
a=ice-options:trickle
a=fingerprint:sha-256 BA:A3:B8:06:91:1D:69:7A:C9:46:58:B1:A7:A5:E1:C6:F7:16:86:71:71:8F:2C:27:D9:95:89:FA:7A:A7:FA:79
a=setup:actpass
a=mid:1
a=extmap:14 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:4 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
a=sendonly
a=msid:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU 0986d5d3-0703-4003-b37e-8d899f0a69de
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:1580989886 cname:VY2dNUk0w4Gmvv8S
a=ssrc:1580989886 msid:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU 0986d5d3-0703-4003-b37e-8d899f0a69de
a=ssrc:1580989886 mslabel:mYoc2iUHPjJzLofS9GBRCjDxlGlYlwmGR7sU
a=ssrc:1580989886 label:0986d5d3-0703-4003-b37e-8d899f0a69de

Janus 传输过来的 answer sdp

v=0
o=- 5247939015171769789 2 IN IP4 115.197.188.117
s=VideoRoom 5422429170528909
t=0 0
a=group:BUNDLE 0 1
a=msid-semantic: WMS janus
m=video 9 UDP/TLS/RTP/SAVPF 102 121
c=IN IP4 115.197.188.117
a=recvonly
a=mid:0
a=rtcp-mux
a=ice-ufrag:fzZp
a=ice-pwd:Hw0H6Sq7a3ntWGGjNUYOmv
a=ice-options:trickle
a=fingerprint:sha-256 10:DC:68:A0:93:38:C8:91:E0:E1:C2:6C:7B:32:5F:1F:C2:7A:AE:73:47:92:C5:CC:3A:52:DA:D8:E3:4B:A0:82
a=setup:active
a=rtpmap:102 H264/90000
a=fmtp:102 profile-level-id=42e01f;packetization-mode=1
a=rtcp-fb:102 ccm fir
a=rtcp-fb:102 nack
a=rtcp-fb:102 nack pli
a=rtcp-fb:102 goog-remb
a=rtcp-fb:102 transport-cc
a=extmap:3 urn:3gpp:video-orientation
a=extmap:4 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:9 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
a=rtpmap:121 rtx/90000
a=fmtp:121 apt=102
a=msid:janus janusv0
a=ssrc:893736536 cname:janus
a=ssrc:893736536 msid:janus janusv0
a=ssrc:893736536 mslabel:janus
a=ssrc:893736536 label:janusv0
a=ssrc:2410485626 cname:janus
a=ssrc:2410485626 msid:janus janusv0
a=ssrc:2410485626 mslabel:janus
a=ssrc:2410485626 label:janusv0
m=audio 9 UDP/TLS/RTP/SAVPF 111
c=IN IP4 115.197.188.117
a=recvonly
a=mid:1
a=rtcp-mux
a=ice-ufrag:fzZp
a=ice-pwd:Hw0H6Sq7a3ntWGGjNUYOmv
a=ice-options:trickle
a=fingerprint:sha-256 10:DC:68:A0:93:38:C8:91:E0:E1:C2:6C:7B:32:5F:1F:C2:7A:AE:73:47:92:C5:CC:3A:52:DA:D8:E3:4B:A0:82
a=setup:active
a=rtpmap:111 opus/48000/2
a=extmap:14 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:4 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
a=msid:janus janusa0
a=ssrc:3761314916 cname:janus
a=ssrc:3761314916 msid:janus janusa0
a=ssrc:3761314916 mslabel:janus
a=ssrc:3761314916 label:janusa0

relay

初始化代码

    const pc = new RTCPeerConnection({
      iceServers: [
        {
          urls: ['turn:free.svipss.top:51351'],
          username: 'test',
          credential: '123456',
          credentialType: 'password',
        },
      ],
      iceTransportPolicy: 'relay',
      iceCandidatePoolSize: '0',
      bundlePolicy: 'max-bundle',
      rtcpMuxPolicy: 'require',
      tcpCandidatePolicy: 'disable',
      IceTransportsType: 'nohost',
    });

信令及网络抓包文件备份位置

浏览器 onicecandidate 上报的 candidate 信息

candidate:3363055999 1 udp 41819903 192.168.100.221 20522 typ relay raddr 0.0.0.0 rport 0 generation 0 ufrag 5Kjh network-id 2

Janus 传输过来的 candidate

candidate:1 1 udp 2013266431 192.168.100.221 20727 typ host
candidate:4 1 udp 1677722111 36.17.176.200 26559 typ srflx raddr 192.168.100.221 rport 20727

浏览器上报的 offer sdp

v=0
o=- 9201388016073680007 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE 0 1
a=extmap-allow-mixed
a=msid-semantic: WMS uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r
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:5Kjh
a=ice-pwd:m6q+npyV1IZKeyHnnUqHRqM7
a=ice-options:trickle
a=fingerprint:sha-256 39:E0:CD:AC:CE:A9:A7:FC:9C:3B:9D:18:2B:57:89:02:A5:76:F9:88:58:6E:08:F7:19:A2:89:D7:37:D4:BE:BE
a=setup:actpass
a=mid:0
a=extmap:1 urn:ietf:params:rtp-hdrext:toffset
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:3 urn:3gpp:video-orientation
a=extmap:4 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://www.webrtc.org/experiments/rtp-hdrext/color-space
a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
a=sendonly
a=msid:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r a7da6eca-a701-47ae-97a3-a5f80531a766
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 profile-id=0
a=rtpmap:99 rtx/90000
a=fmtp:99 apt=98
a=rtpmap:100 VP9/90000
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 profile-id=2
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=1;profile-level-id=42001f
a=rtpmap:121 rtx/90000
a=fmtp:121 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=0;profile-level-id=42001f
a=rtpmap:120 rtx/90000
a=fmtp:120 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=1;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=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
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=4d001f
a=rtpmap:119 rtx/90000
a=fmtp:119 apt=124
a=rtpmap:123 H264/90000
a=rtcp-fb:123 goog-remb
a=rtcp-fb:123 transport-cc
a=rtcp-fb:123 ccm fir
a=rtcp-fb:123 nack
a=rtcp-fb:123 nack pli
a=fmtp:123 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=64001f
a=rtpmap:118 rtx/90000
a=fmtp:118 apt=123
a=rtpmap:114 red/90000
a=rtpmap:115 rtx/90000
a=fmtp:115 apt=114
a=rtpmap:116 ulpfec/90000
a=ssrc-group:FID 3851211885 533968763
a=ssrc:3851211885 cname:z2t/m6UUThUKAgDi
a=ssrc:3851211885 msid:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r a7da6eca-a701-47ae-97a3-a5f80531a766
a=ssrc:3851211885 mslabel:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r
a=ssrc:3851211885 label:a7da6eca-a701-47ae-97a3-a5f80531a766
a=ssrc:533968763 cname:z2t/m6UUThUKAgDi
a=ssrc:533968763 msid:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r a7da6eca-a701-47ae-97a3-a5f80531a766
a=ssrc:533968763 mslabel:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r
a=ssrc:533968763 label:a7da6eca-a701-47ae-97a3-a5f80531a766
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:5Kjh
a=ice-pwd:m6q+npyV1IZKeyHnnUqHRqM7
a=ice-options:trickle
a=fingerprint:sha-256 39:E0:CD:AC:CE:A9:A7:FC:9C:3B:9D:18:2B:57:89:02:A5:76:F9:88:58:6E:08:F7:19:A2:89:D7:37:D4:BE:BE
a=setup:actpass
a=mid:1
a=extmap:14 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:4 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
a=sendonly
a=msid:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r 2d7b5213-1b74-4337-89ca-63066b82ff09
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:759971761 cname:z2t/m6UUThUKAgDi
a=ssrc:759971761 msid:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r 2d7b5213-1b74-4337-89ca-63066b82ff09
a=ssrc:759971761 mslabel:uwxAqntLGCUoAu6ORa4hzgqkL1xnH4QVco5r
a=ssrc:759971761 label:2d7b5213-1b74-4337-89ca-63066b82ff09

Janus 传输过来的 answer sdp

v=0
o=- 9201388016073680007 2 IN IP4 115.197.188.117
s=VideoRoom 5422429170528909
t=0 0
a=group:BUNDLE 0 1
a=msid-semantic: WMS janus
m=video 9 UDP/TLS/RTP/SAVPF 102 121
c=IN IP4 115.197.188.117
a=recvonly
a=mid:0
a=rtcp-mux
a=ice-ufrag:DH79
a=ice-pwd:/U7fmuYsw5nes1eUc2LdTZ
a=ice-options:trickle
a=fingerprint:sha-256 10:DC:68:A0:93:38:C8:91:E0:E1:C2:6C:7B:32:5F:1F:C2:7A:AE:73:47:92:C5:CC:3A:52:DA:D8:E3:4B:A0:82
a=setup:active
a=rtpmap:102 H264/90000
a=fmtp:102 profile-level-id=42e01f;packetization-mode=1
a=rtcp-fb:102 ccm fir
a=rtcp-fb:102 nack
a=rtcp-fb:102 nack pli
a=rtcp-fb:102 goog-remb
a=rtcp-fb:102 transport-cc
a=extmap:3 urn:3gpp:video-orientation
a=extmap:4 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:9 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
a=rtpmap:121 rtx/90000
<


																				
						
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全面解析 RTCPeerConnection 的 iceTransportPolicy 配置

介绍

枚举值说明

验证环境

对比结果

疑问： 为啥使用 all 时未获取到 relay 候选项？？？

信令及网络抓包文件备份位置

信令分析

all

初始化代码

浏览器 onicecandidate 上报的 candidate 信息

Janus 传输过来的 candidate

浏览器上报的 offer sdp

Janus 传输过来的 answer sdp

relay

初始化代码

信令及网络抓包文件备份位置

浏览器 onicecandidate 上报的 candidate 信息

Janus 传输过来的 candidate

浏览器上报的 offer sdp

Janus 传输过来的 answer sdp

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