webrtcsdp

Why mutliple transport ICE candidate allocated even when sdp using `a=group:BUNDLE 0 1` in chrome?

Chrome version: 113.0.5672.129。

Offer sdp:

v=0
a=group:BUNDLE 0 1
...
m=video
a=mid:0
...
m=application 
a=mid:1

But I found the ice candidates collected locally are splitted into two groups, one for mid-0, the other for mid-1:

sdpMid: 0, sdpMLineIndex: 0, candidate: candidate:2558938800 1 udp 2122260223 192.168.2.200 54078 typ host generation 0 ufrag DncU network-id 1
sdpMid: 1, sdpMLineIndex: 1, candidate: candidate:2558938800 1 udp 2122260223 192.168.2.200 54079 typ host generation 0 ufrag DncU network-id 1
sdpMid: 0, sdpMLineIndex: 0, candidate: candidate:1250609983 1 udp 1686052607 115.89.7.51 60609 typ srflx raddr 192.168.2.200 rport 54078 generation 0 ufrag DncU network-id 1
sdpMid: 1, sdpMLineIndex: 1, candidate: candidate:1250609983 1 udp 1686052607 115.89.7.51 43434 typ srflx raddr 192.168.2.200 rport 54079 generation 0 ufrag DncU network-id 1

It this a bug for chrome?

Solution

  • Unless you set the bundlePolicy to max-bundle that is the behavior required by the specification.