---
title: IOAudioStreamFormatExtension
framework: IOKit
role: symbol
role_heading: Structure
platforms: [Mac Catalyst 13.0+, macOS 10.2+]
path: iokit/ioaudiostreamformatextension
---

# IOAudioStreamFormatExtension

## Declaration

```occ
typedef struct _IOAudioStreamFormatExtension {
    ...
} IOAudioStreamFormatExtension;
```

## Topics

### Instance Properties

- [fBytesPerPacket](iokit/ioaudiostreamformatextension/1584666-fbytesperpacket.md)
- [fFlags](iokit/ioaudiostreamformatextension/1584847-fflags.md)
- [fFramesPerPacket](iokit/ioaudiostreamformatextension/1584556-fframesperpacket.md)
- [fVersion](iokit/ioaudiostreamformatextension/1584746-fversion.md)