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# GetIOMemoryDescriptor

Gets the memory descriptor the stream uses for I/O.

```
OSSharedPtr<IOMemoryDescriptor> GetIOMemoryDescriptor();
```

## Discussion

This is the value provided to the stream’s initializer, or updated later by a call to [`SetIOMemoryDescriptor`](/documentation/AudioDriverKit/IOUserAudioStream/SetIOMemoryDescriptor).

---

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