1414807 - RTCPeerConnection: Remote description changes

Status: NEW

(Core :: WebRTC: Audio/Video, defect, P3)

Description

[mparisdiaz]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0
Build ID: 20171003101344

Steps to reproduce:

Just run the next JSFiddle script: https://jsfiddle.net/91mu5f2d/17/


Actual results:

When a remote offer reuses a m-line changing the media type the next error is thrown:
"Remote description changes the media type of m-line 1"


Expected results:

The offer should be accepted as it follows https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-24#section-5.2.2

Comment 1

[Dan Minor [:dminor]]

I can confirm the results of the jsfiddle, but I'm not sure how to prioritize this. Nils, what do you think?

Comment 2

[Nils Ohlmeier [:drno]]

Let's have a look at this after transceivers are landed, because I fear they change our behavior as well as the expected behavior in this area.

Comment 3

[mparisdiaz]

OK
Could you please ping here when you expect to have this fixed?

Comment 4

[Nils Ohlmeier [:drno]]

Transceivers landed and the fiddle still produces the error. Byron what do you think about this one in terms of prioritizing?

Comment 5

[Byron Campen [:bwc]]

I suppose we could allow this, but I do not think it is a good idea for us to create an offer that does this; it will not interop with anything besides other browsers.

Comment 6

[Byron Campen [:bwc]]

Also, you are not allowed to change the type of an m-section unless it was rejected (port 0) during the last negotiation, which does not appear to be the case in that fiddle.