Webrtcbin SDP Renegotation (1.18): Not in the correct state (stable) for setting remote answer description

[Trey Hutcheson]

Yes I am aware of the name argument. Webrtcbin just happens to be the name
we're using at the moment, though admittedly it's a poor chase.

There is nothing else in the logs. The error message is what I shared in
the original email. That's why I asked the list for help; the logs don't
really provide any info.

And that's with GST_DEBUG set to 3,webrtcbin:9

On Fri, Dec 4, 2020, 2:02 PM Trey Hutcheson <trey.hutcheson at gmail.com>
wrote:

> I know SDP renegotiation is something that saw lots of improvements from
> 1.16->1.18, but I'm currently stuck.
>
> Here's my workflow:
> * create webrtcbin instance for peer 1. Initialize with one audio source.
> Create offer (sdp contains one audio m= line), set-local-description, send
> to remote peer. Remote peer responds with answer, then
> set-remote-description.
> * Create another webrtcbin instance for peer 2. Same workflow. Exchange
> sdp, with webrtcbin generating the offer.
> * Media (audio) flows from remote peer 2. Dynamically connect audio (opus,
> opusdepay then opuspay  to re-payload the rtp) from webrtcbin2 to
> webrtcbin1.
> * Ask webrtcbin1 to create a new offer, then set-local-description. Offer
> now has two audio m= lines. Send offer to remote peer, peer responds with
> new answer (with two m= lines). set-remote-description on webrtcbin1
>
> When I call set-remote-description with the updated answer, webrtcbin
> complains:
>
> ERROR              webrtcbin
> gstwebrtcbin.c:4320:_set_description_task:<webrtcbin> Not in the correct
> state (stable) for setting remote answer description
>
> And that's because sdp was previously negotiated, and the signalling state
> had achieved stable. But I want to re-negotiate, and I assumed invoking
> create-offer a second time (after connecting a new sink pad and verifying
> caps) would change the signalling state?
>
>
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