---
title: mFramesPerPacket
framework: coreaudiotypes
role: symbol
role_heading: Instance Property
path: coreaudiotypes/audiostreambasicdescription/mframesperpacket
---

# mFramesPerPacket

The number of frames in a packet of audio data.

## Declaration

```swift
var mFramesPerPacket: UInt32
```

## Discussion

Discussion For uncompressed audio, the value is 1. For variable bit-rate formats, the value is a larger fixed number, such as 1024 for AAC. For formats with a variable number of frames per packet, such as Ogg Vorbis, set this field to 0.

## See Also

### Inspecting a description

- [mFormatID](coreaudiotypes/audiostreambasicdescription/mformatid.md)
- [mFormatFlags](coreaudiotypes/audiostreambasicdescription/mformatflags.md)
- [mSampleRate](coreaudiotypes/audiostreambasicdescription/msamplerate.md)
- [mBitsPerChannel](coreaudiotypes/audiostreambasicdescription/mbitsperchannel.md)
- [mBytesPerFrame](coreaudiotypes/audiostreambasicdescription/mbytesperframe.md)
- [mChannelsPerFrame](coreaudiotypes/audiostreambasicdescription/mchannelsperframe.md)
- [mBytesPerPacket](coreaudiotypes/audiostreambasicdescription/mbytesperpacket.md)
- [mReserved](coreaudiotypes/audiostreambasicdescription/mreserved.md)