---
title: performFormatChange
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/ioaudioengine/1561599-performformatchange
---

# performFormatChange

## Declaration

```occ
virtual IOReturn performFormatChange(IOAudioStream *audioStream, const IOAudioStreamFormat *newFormat, const IOAudioStreamFormatExtension *formatExtension, const IOAudioSampleRate *newSampleRate);
```