NativeLsl_push_chunk_buf typedef
        NativeLsl_push_chunk_buf =
     Int32 Function(lsl_outlet out, Pointer<Pointer<Char> >  data, Pointer<Uint32>  lengths, UnsignedLong data_elements)
    
    
    
Implementation
typedef NativeLsl_push_chunk_buf =
    ffi.Int32 Function(
      lsl_outlet out,
      ffi.Pointer<ffi.Pointer<ffi.Char>> data,
      ffi.Pointer<ffi.Uint32> lengths,
      ffi.UnsignedLong data_elements,
    );