Function realsense_sys::rs2_get_frame_timestamp

pub unsafe extern "C" fn rs2_get_frame_timestamp(
    frame: *const rs2_frame, 
    error: *mut *mut rs2_error
) -> rs2_time_t

retrieve timestamp from frame handle in milliseconds \param[in] frame handle returned from a callback \param[out] error if non-null, receives any error that occurs during this call, otherwise, errors are ignored \return the timestamp of the frame in milliseconds