Function VTSessionCopySerializableProperties 

pub unsafe extern "C-unwind" fn VTSessionCopySerializableProperties(
    session: &VTSession,
    allocator: Option<&CFAllocator>,
    dictionary_out: NonNull<*const CFDictionary>,
) -> i32

Available on crate feature VTSession only.

Retrieves the set of serializable property keys and their current values.

The serializable properties are those which can be saved and applied to a different session. The caller must release the returned dictionary.