1.9 KiB
ADR-0001: P2P-First Media Topology
- Status: Historical MVP baseline; superseded for current routing by ADR-0005
- Date: 2026-08-18
Durable Rationale
Screener serves one broadcaster and a small group of trusted friends. Low latency, private access, browser viewing, and low server media cost matter more than public-broadcast scale. Direct WebRTC therefore remains the preferred media path, while centralized media is fallback infrastructure rather than the default topology.
The control and media planes are separate. HTTPS/WSS owns identity, rooms, invitations, presence, and signaling; WebRTC owns encrypted media. STUN is required for ordinary peer discovery. Every attempted route must end in bounded success or a clear failure, because direct connectivity is not universal across NAT, CGNAT, firewalls, and changing networks.
Historical MVP Decision
The first MVP used one broadcaster-to-Viewer peer connection per Viewer and did not implement automatic topology migration. That implementation proved the browser-first product surface but did not establish a sustainable fanout, fallback order, or server-resource policy.
The MVP explicitly excluded always-SFU conferencing, public-broadcast scaling, MCU transcoding, and a custom Parsec-like transport. Those workloads either contradict the private-room cost model or duplicate mature WebRTC capabilities.
Current Ownership
ADR-0005 owns current routing invariants and assisted-route roles. Current source, production, and real-network validation are indexed by status and verification status. ADR-0004 owns only historical peer-assisted evidence. Access and room lifetime are owned by ADR-0002.
This historical record does not authorize a capacity, SFU/TURN order, topology, runtime migration, or release gate.