<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: 15.4.0 -",
    "macOS: 12.3.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreMediaIO",
  "identifier" : "/documentation/CoreMediaIO/CMIOExtensionProperty/streamSinkBufferQueueSize",
  "metadataVersion" : "0.1.0",
  "role" : "Type Property",
  "symbol" : {
    "kind" : "Type Property",
    "modules" : [
      "Core Media I/O",
      "CoreMediaIO"
    ],
    "preciseIdentifier" : "c:@CMIOExtensionPropertyStreamSinkBufferQueueSize"
  },
  "title" : "streamSinkBufferQueueSize"
}
-->

# streamSinkBufferQueueSize

A property key for the sink buffer queue size.

```
static let streamSinkBufferQueueSize: CMIOExtensionProperty
```

## Discussion

The property state for this property is a number. The property value matches the value of the [`kCMIOStreamPropertyOutputBufferQueueSize`](/documentation/CoreMediaIO/kCMIOStreamPropertyOutputBufferQueueSize) property.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)