FCE-3588: TrackDeviceController and TrackPublisher - #590
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August 5, 2026 14:26
The camera/microphone controller ported from react-client's useTrackManager/useDeviceManager/useTrackMiddleware, preserving the pinned invariants: ideal-vs-exact deviceId constraints, enabled=false reapplied to fresh tracks while muted, selectDevice without a live track only records the selection, stopDevice performs no signalling call, pause/resume via replaceTrack + paused metadata, join auto-publish with TrackTypeError swallowed, and local-to-remote track-id resolution awaiting an in-flight addTrack. TrackPublisher is the narrow signalling adapter that keeps the controller free of Peer generics; LocalDeviceState is the controller's snapshot shape (ClientState wiring lands with the orchestrator).
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Stacked on #589.
Description
TrackDeviceController: the camera/microphone controller ported from react-client'suseTrackManager/useDeviceManager/useTrackMiddleware. Preserves the pinned behavioral invariants:idealdeviceId on init vsexacton explicit start/select,enabled=falsereapplied to fresh tracks while muted,selectDevicewithout a live track only records the selection,stopDeviceperforms no signalling call, mute/pause asreplaceTrack(null)+pausedmetadata (resume inverse), join auto-publish withTrackTypeErrorswallowed, and local→remote track-id resolution that awaits an in-flightaddTrack.TrackPublisher: narrow signalling adapter — keeps the controller free ofPeergenerics and confines the platform→DOM track cast.LocalDeviceStateinclientState.ts: the controller's snapshot shape (store wiring lands with the orchestrator in the next PR).Motivation and Context
This is the hardest concurrency logic in the SDK (FCE-3588's scope, shared with the microphone per FCE-3583) — moved into tsunami as a framework-free class, testable without React.
Documentation impact
Types of changes
not work as expected)