ma_read_procFunction typedef
        ma_read_procFunction =
     Int Function(Pointer<Void>  pUserData, Pointer<Void>  pBufferOut, Size bytesToRead, Pointer<Size>  pBytesRead)
    
    
    
Implementation
typedef ma_read_procFunction = ffi.Int Function(
    ffi.Pointer<ffi.Void> pUserData,
    ffi.Pointer<ffi.Void> pBufferOut,
    ffi.Size bytesToRead,
    ffi.Pointer<ffi.Size> pBytesRead);