<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: 15.4.0 -",
    "macOS: 12.3.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreMediaIO",
  "identifier" : "/documentation/CoreMediaIO/CMIOExtensionProvider/init(source:clientQueue:)",
  "metadataVersion" : "0.1.0",
  "role" : "Initializer",
  "symbol" : {
    "kind" : "Initializer",
    "modules" : [
      "Core Media I/O"
    ],
    "preciseIdentifier" : "c:objc(cs)CMIOExtensionProvider(im)initWithSource:clientQueue:"
  },
  "title" : "init(source:clientQueue:)"
}
-->

# init(source:clientQueue:)

Creates an extension provider with the specified source and dispatch queue.

```
init(source: any CMIOExtensionProviderSource, clientQueue: dispatch_queue_t?)
```

## Parameters

`source`

An extension-specific object that conforms to the [`CMIOExtensionProviderSource`](/documentation/CoreMediaIO/CMIOExtensionProviderSource) protocol.

`clientQueue`

A client dispatch queue, or `nil` to use the default queue.

---

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)