Function segment_available_until_ticks 

pub fn segment_available_until_ticks(
    ast_us: i128,
    period_start_us: i128,
    start_ticks: i128,
    duration_ticks: i128,
    timescale: u64,
    tsb_us: Option<i128>,
) -> Option<i128>

segment_available_until for a segment given in ticks.