require Track
Returns the passedTrack or the currently provided TrackReferenceLocal.
Throws
if passedTrack is null and no TrackReferenceLocal is available (e.g. not inside a TrackReferenceScope).
Returns the passedTrack or the currently provided TrackReferenceLocal.
if passedTrack is null and no TrackReferenceLocal is available (e.g. not inside a TrackReferenceScope).