SMB/direct-file Dolby Vision doesn't drive the HDR display-mode switch

[thatcube]

Symptom

Playing a Dolby Vision file from an SMB share does not trigger the Apple TV's HDR/DoVi display-mode switch (no HDR "brightness"), even though we believe the source is known to be Dolby Vision. This likely never worked for direct-file sources.

Diagnosis

The native path drives the tvOS HDMI dynamic-range handshake via AVDisplayManager.preferredDisplayCriteria, gated in PlayerViewModel:

// Sources/FeaturePlayback/PlayerViewModel.swift (~line 981)
displayMode = engineKind == .native ? HDRDisplayMode(request.sourceMetadata) : .sdr

HDRDisplayMode(_:) (Sources/FeaturePlayback/DolbyVisionDisplayCriteria.swift) classifies the source from sourceMetadata.video.videoRangeType (the DOVI* token), falling back to videoRange / colorTransfer.

You get the DoVi handshake only when both:

1. the item plays on the native engine (Plozzigen is intentionally forced .sdr — only Apple's pipeline can light up the DoVi HDMI handshake), and
2. sourceMetadata.video.videoRangeType carries a DOVI token.

The gap: videoRangeType is only ever populated by:

• Sources/ProviderPlex/PlexProvider.swift
• Sources/ProviderJellyfin/JellyfinProvider.swift
• the local probe → Sources/CoreModels/ProbedStreamFacts.swift

An SMB share is not its own provider — it arrives as a direct file (WebDAV/MediaTransport) or a Jellyfin/Plex library backed by SMB. For a direct SMB file without Plex/Jellyfin API metadata, the DoVi range can only reach sourceMetadata through the local probe (ProbedStreamFacts). So either:

• the probe isn't tagging videoRangeType=DOVI for the SMB/direct source, or
• that item routes to Plozzigen, where displayMode is deliberately forced .sdr.

Where the fix likely lives

Sources/CoreModels/ProbedStreamFacts.swift, Sources/CoreModels/PlaybackModels.swift, and the EnginePlozzigen prober (probe→videoRangeType population), plus possibly the engine-routing decision for direct-file DoVi. Not in FeaturePlayback — the display-switch gate there is correct and unchanged.

Notes

• Unrelated to the current FeaturePlayback decomposition work; HDRDisplayMode / the line-981 gate are untouched by that refactor.
• Repro: play a known-DoVi file from an SMB share; observe no HDR display-mode switch. Confirm via the playback diagnostics overlay whether rangeType/videoRangeType is populated and which engine is active.