---
title: "AudioConverterNewSpecific(_:_:_:_:_:)"
framework: audiotoolbox
role: symbol
role_heading: Function
path: "audiotoolbox/audioconverternewspecific(_:_:_:_:_:)"
---

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

Creates a new audio converter object using a specified codec.

## Declaration

```swift
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

Return Value A  result code.

## Discussion

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

## See Also

### Managing Audio Converter Objects

- [AudioConverterNew(_:_:_:)](audiotoolbox/audioconverternew(_:_:_:).md)
- [AudioConverterReset(_:)](audiotoolbox/audioconverterreset(_:).md)
- [AudioConverterDispose(_:)](audiotoolbox/audioconverterdispose(_:).md)