---
title: "init(byteSource:estimatedSampleLocation:refinementDataLocation:)"
framework: MediaExtension
role: symbol
role_heading: Initializer
platforms: [macOS 14.0+]
path: "mediaextension/meestimatedsamplelocation/init(bytesource:estimatedsamplelocation:refinementdatalocation:)"
---

# init(byteSource:estimatedSampleLocation:refinementDataLocation:)

Creates an estimated sample location object with the byte source, sample location, and data location that you specify.

## Declaration

```swift
init(byteSource: MEByteSource, estimatedSampleLocation: AVSampleCursorStorageRange, refinementDataLocation: AVSampleCursorStorageRange)
```

## Parameters

- `byteSource`: The byte source to use to read the data for the sample.
- `estimatedSampleLocation`: The estimated starting file offset and size in bytes of the sample.
- `refinementDataLocation`: The starting file offset and size in bytes of the data necessary to provide an accurate sample location.