add video support

[Hollymingyi]

hi author,
this is my code added for video . but when it work , call from sipjs softphone into livekit ,the video of softphone is very fuzzy, i dont know how to handle it . please give me some advice , thank you.

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[codecov]

Codecov Report

Attention: Patch coverage is 20.94595% with 117 lines in your changes missing coverage. Please review.

Project coverage is 22.17%. Comparing base (d95bd1f) to head (81ad021).
Report is 143 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/sip/inbound.go	4.87%	39 Missing ⚠️
pkg/sip/outbound.go	0.00%	34 Missing ⚠️
pkg/sip/room.go	0.00%	32 Missing ⚠️
pkg/media/h264/h264.go	0.00%	10 Missing ⚠️
pkg/sip/signaling.go	93.54%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   22.02%   22.17%   +0.15%     
==========================================
  Files          20       21       +1     
  Lines        1562     1655      +93     
==========================================
+ Hits          344      367      +23     
- Misses       1190     1260      +70     
  Partials       28       28              

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[iAbdulaziz93]

Hi @Hollymingyi. I'm working on supporting video calls over SIP on an application I'm working on, I'm using LiveKit. Did you get your issue solved? Is this PR is working fine on your side and the video issues like the video is fuzzing is solved on your end?

[iAbdulaziz93]

Hi @dennwc. Did you have a chance to review this PR? It will help us a lot if this PR gets reviewed and approved and added support of videos to LiveKit SIP.

[dennwc]

Yes, I did, but at this point it needs to be updated to match the latest codebase.

And to get accepted, it would need to properly fallback to audio-only, which is not implemented in this PR.

Also note that it can only accept one video stream, while LiveKit room typically contain multiple participants. SIP currently mixes audio from multiple participants, so for proper support it must do speaker detection or something similar to switch video steam to the talking participant. Or at least fallback to audio-only if multiple participants are present.

This is the reason why we don't have plans to support it - it's adding complexity that could be avoided if client will run LiveKit in the first place. If the client is video-capable, it usually means it could probably run a browser with LiveKit and get all benefits of it without going through SIP.