Function cm_sample_buffer_get_presentation_timestamp 

pub unsafe extern "C" fn cm_sample_buffer_get_presentation_timestamp(
    sample_buffer: *mut c_void,
    out_value: *mut i64,
    out_timescale: *mut i32,
    out_flags: *mut u32,
    out_epoch: *mut i64,
)

Swift bridge function cm_sample_buffer_get_presentation_timestamp for the corresponding Apple API.