---
title: "init(byteSource:chunkStorageRange:chunkInfo:sampleIndexWithinChunk:)"
framework: MediaExtension
role: symbol
role_heading: Initializer
platforms: [macOS 14.0+]
path: "mediaextension/mesamplecursorchunk/init(bytesource:chunkstoragerange:chunkinfo:sampleindexwithinchunk:)"
---

# init(byteSource:chunkStorageRange:chunkInfo:sampleIndexWithinChunk:)

Creates a new sample cursor chunk with byte source and chunk data that you provide.

## Declaration

```swift
init(byteSource: MEByteSource, chunkStorageRange: AVSampleCursorStorageRange, chunkInfo: AVSampleCursorChunkInfo, sampleIndexWithinChunk: CFIndex)
```

## Parameters

- `byteSource`: The byte source to use to read the data for the sample.
- `chunkStorageRange`: The offset location and length of the sample’s chunk within the byte source.
- `chunkInfo`: An object that provides details about the chunk in the media.
- `sampleIndexWithinChunk`: The offset index of the sample within the chunk, in samples.