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# AudioConverterNewSpecific(_:_:_:_:_:)

Creates a new audio converter object using a specified codec.

```
func AudioConverterNewSpecific(_ inSourceFormat: UnsafePointer<AudioStreamBasicDescription>, _ inDestinationFormat: UnsafePointer<AudioStreamBasicDescription>, _ inNumberClassDescriptions: UInt32, _ inClassDescriptions: UnsafePointer<AudioClassDescription>, _ outAudioConverter: UnsafeMutablePointer<AudioConverterRef?>) -> OSStatus
```

## Parameters

`inSourceFormat`

The format of the source audio to be converted.

`inDestinationFormat`

The destination format to which the audio is to be converted.

`inNumberClassDescriptions`

The number of class descriptions supplied in the `inClassDescriptions` parameter.

`inClassDescriptions`

A list of `AudioClassDescription` objects that specify the codec to use.

`outAudioConverter`

On return, a new audio converter object.

## Return Value

A  result code.

## Discussion

This function is identical to [`AudioConverterNew(_:_:_:)`](/documentation/AudioToolbox/AudioConverterNew(_:_:_:)) function, except that your application may explicitly choose which codec to instantiate if there is more than one choice.

---

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