Function get_metadata_track_samples 

pub fn get_metadata_track_samples<F, T: Read + Seek>(
    stream: &mut T,
    size: usize,
    single: bool,
    callback: F,
    cancel_flag: Arc<AtomicBool>,
) -> Result<MediaContext>
where
    F: FnMut(SampleInfo, &[u8], u64),