---
title: "init(audioDataBuffer:formatDescription:sampleCount:presentationTimeStamp:)"
framework: coremedia
role: symbol
role_heading: Initializer
path: "coremedia/cmreadysamplebuffer/init(audiodatabuffer:formatdescription:samplecount:presentationtimestamp:)"
---

# init(audioDataBuffer:formatDescription:sampleCount:presentationTimeStamp:)

Creates a sample buffer carrying audio media data.

## Declaration

```swift
init(audioDataBuffer content: Content, formatDescription: CMAudioFormatDescription, sampleCount: Int, presentationTimeStamp: CMTime)
```

## Parameters

- `formatDescription`: Format description of the content. The format must have audio media type.
- `sampleCount`: Number of samples in the content. Must be greater than 0.
- `presentationTimeStamp`: The time at which the first sample will be presented. Must be valid numeric time.

## Discussion

Discussion Use this init when the audio format is a linear PCM format or a constant bit rate (CBR) format. The AudioStreamBasicDescription in the format is used along with sampleCount & presentationTimeStamp to calculate the sample size & timings. The AudioStreamBasicDescription/mBytesPerPacket in the format description must be 0 for this init to consider it as a valid format. Otherwise, init(compressedAudioDataBuffer:formatDescription:presentationTime:packetDescriptions:) must be used along with a valid packet description array.