Assign each time to its interval in a TextGrid interval tier

Usage

assign_tier_landmarks(times, t1, t2, labels)

Arguments

times: Numeric vector of frame times (seconds).
t1, t2: Interval start/end times (from an rPraat interval tier).
labels: Interval labels (same length as t1/t2).

Value

A data.frame with one row per times value: label, start, end, and idx — the 1-based ordinal of the interval among non-empty-labelled intervals (NA inside empty/unlabelled intervals or outside the tier's span).