---
title: "withUnsafeAudioStreamPacketDescriptions(_:)"
framework: coremedia
role: symbol
role_heading: Instance Method
path: "coremedia/cmsamplebuffer/withunsafeaudiostreampacketdescriptions(_:)"
---

# withUnsafeAudioStreamPacketDescriptions(_:)

Calls a closure with an audio stream packet description.

## Declaration

```swift
func withUnsafeAudioStreamPacketDescriptions<R>(_ body: (UnsafeBufferPointer<AudioStreamPacketDescription>) throws -> R) throws -> R
```

## Parameters

- `body`: A closure the system calls with a pointer to an audio stream packet description.

## See Also

### Modifying Sample Buffers

- [dataBuffer](coremedia/cmsamplebuffer/databuffer.md)
- [setDataBuffer(_:)](coremedia/cmsamplebuffer/setdatabuffer(_:).md)
- [imageBuffer](coremedia/cmsamplebuffer/imagebuffer.md)
- [withAudioBufferList(blockBufferMemoryAllocator:flags:body:)](coremedia/cmsamplebuffer/withaudiobufferlist(blockbuffermemoryallocator:flags:body:).md)
- [setDataBuffer(fromAudioBufferList:blockBufferMemoryAllocator:flags:)](coremedia/cmsamplebuffer/setdatabuffer(fromaudiobufferlist:blockbuffermemoryallocator:flags:).md)
- [copyPCMData(fromRange:into:)](coremedia/cmsamplebuffer/copypcmdata(fromrange:into:).md)
- [audioStreamPacketDescriptions()](coremedia/cmsamplebuffer/audiostreampacketdescriptions().md)
- [singleSampleBuffers()](coremedia/cmsamplebuffer/singlesamplebuffers().md)
- [CMSampleBuffer.SingleSampleBuffers](coremedia/cmsamplebuffer/singlesamplebuffers.md)