Layer Seeding

app.application.services.helpers.layer_seeding

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Compatibility seeding shared by editable-layer reads and track mutations.

seed_layer_frame_from_layer(source: VideoDataLayer, target: VideoDataLayer, session: Session, frame_index: int) -> None

Seed an absent editable frame with filtered clones of its source boxes.

PARAMETER	DESCRIPTION
source	Immutable source A or C. TYPE: VideoDataLayer
target	Corresponding editable layer B or D. TYPE: VideoDataLayer
session	Session whose data is read and updated. TYPE: Session
frame_index	Frame to initialize if its source contains boxes. TYPE: int

Side Effects

Acquires the session's reentrant data lock across the check and write. Existing target frames, including intentionally empty frames, remain untouched. Missing or empty source frames do not create target entries.