feat(sip-video-bridge): introduce production-grade SIP → WebRTC video…

[Nawaf-Almansour]

… bridge with control plane, resilience, and adaptive media pipeline

• Add full video bridge pipeline (SIP RTP → ingest → codec/router → transcode → publisher → LiveKit)
• Implement H264 depacketizer/repacketizer with STAP-A and FU-A support
• Introduce codec router (passthrough vs transcode) with dynamic switching
• Add GPU-enabled transcoding with queue-based backpressure control
• Implement adaptive bitrate and load-aware degradation strategies

Session & Lifecycle:

• Add session manager with lifecycle control and cleanup
• Introduce explicit state machine with transition validation
• Extract media pipeline into media_pipe abstraction
• Add Redis-backed session store for distributed coordination

Resilience & Control Plane:

• Add circuit breaker (per-session and global)
• Implement feature flags with tenant, region, and percentage rollout
• Add dynamic config with runt
• Add full video bridge pipeline (SIP RTP → ingest → codec/router → transcode → publisher → LiveKit)
• Implement H264 depacketizer/repacketizer with STAP-A and FU-A support
• Introduce bac- Implement H264 depacketizer/repacketizer with STAP-A and FU-A support
• Introduce codec router (passthroughre- Introduce codec router (passthrough vs transcode) with dynamic switcio- Add GPU-enabled transcoding with queue-based backpresscing hooks
• Implem- Implement adaptive bitrate and load-aware degradation strategiesif Session & Lifecycle:
• Add session manager with lifecycle controP i- Add session manag b- Introduce explicit state machine with transition valiGP- Extract media pipeline into media_pipe abstraction
• Add RSu- Add Redis-backed session store for distributed codi Resilience & Control Plane:
• Add circuit breaker (per-sessrit- Add circuit breakerintegra- Implement feature flags with tenant, regionha- Add dynamic config with runt
• Add full video bridge pipeline (SIPoo- Add full video bridge pipelwi- Implement H264 depacketizer/repacketizer with STAP-A and FU-A support
• Introduce bac- Implement H264 depacol- Introduce bac- Implement H264 depacketizer/repacketizer with STAP-A ct- Introduce codec router (passthroughre- Introduce codec router (passthrough vs trans f- Implem- Implement adaptive bitrate and load-aware degradation strategiesif Session & Lifecycle:
• Add session manager with lifecycle controP i- Add session manag b- IntroduceurSession & Lifecycle: -

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[codecov]

Codecov Report

❌ Patch coverage is 28.97351% with 3003 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.06%. Comparing base (0460b40) to head (5255cd4).
⚠️ Report is 251 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/videobridge/bridge.go	0.00%	366 Missing ⚠️
pkg/videobridge/signaling/server.go	0.00%	212 Missing ⚠️
pkg/videobridge/transcode/transcode.go	0.00%	197 Missing ⚠️
pkg/videobridge/publisher/publisher.go	0.00%	193 Missing ⚠️
pkg/videobridge/ingest/rtp_receiver.go	0.00%	173 Missing ⚠️
pkg/videobridge/session/session.go	0.00%	132 Missing ⚠️
pkg/videobridge/transcode/gpu.go	0.00%	124 Missing ⚠️
pkg/videobridge/session/redis_store.go	0.00%	123 Missing ⚠️
pkg/videobridge/resilience/degradation.go	0.00%	118 Missing ⚠️
pkg/videobridge/transcode/queue.go	0.00%	115 Missing ⚠️
... and 28 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #637       +/-   ##
===========================================
- Coverage   65.25%   52.06%   -13.20%     
===========================================
  Files          51       74       +23     
  Lines        6588    11321     +4733     
===========================================
+ Hits         4299     5894     +1595     
- Misses       1915     4949     +3034     
- Partials      374      478      +104     

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[dennwc]

Hi @Nawaf-Almansour! Thank you for all the work you did to make this happen! This PR is really impressive, but also massive. Because of that, we won't be able to accept it in the current form.

Parts of it really belong to the media-sdk. It would be great if you could split media-related parts and move those to that project instead (as a first step).

Most of the code here is brand-new and doesn't reuse any of the existing code we have (e.g. SDP parsing and handling, session state storage). Ideally, existing components should be updated for supporting video (optionally), as opposed to rebuilding everything from scratch.

Having this project as a separate binary outside of our SIP audio-only bridge make sense, though. The requirements for this use case might be sufficiently different and it might not make sense to fuse these two implementations together.

But other parts that I mentioned above should be shared, if possible. Is that something you are willing to do to push this PR forward?