<!--
{
  "availability" : [
    "iOS: 9.0.0 -",
    "iPadOS: 9.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.11.0 -",
    "tvOS: 9.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 2.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AVFAudio",
  "identifier" : "/documentation/AVFAudio/AVAudioConverter/channelMap",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "AVFAudio"
    ],
    "preciseIdentifier" : "c:objc(cs)AVAudioConverter(py)channelMap"
  },
  "title" : "channelMap"
}
-->

# channelMap

An array of integers that indicates which input to derive each output from.

```
var channelMap: [NSNumber] { get set }
```

## Discussion

The array size equals the number of output channels. Each element’s value is the input channel number, starting with zero, that the framework copies to that output.

A negative value means that the output channel doesn’t have a source and is silent.

Setting a channel map overrides channel mapping due to any channel layouts in the input and output formats that you supply.

---

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)