Function get_raw_segments 

pub fn get_raw_segments(
    part: &Stream,
    hand: Option<Hand>,
    contexts: &[NoteContext],
    options: SegmentOptions,
) -> Vec<BrailleSegment>

A part’s measures cut into segments of groupings: music21’s getRawSegments. A segment ends after a double or final barline once it holds more than 48 elements.