---
title: kCVImageBufferFieldDetailSpatialFirstLineEarly
framework: corevideo
role: symbol
role_heading: Global Variable
path: corevideo/kcvimagebufferfielddetailspatialfirstlineearly
---

# kCVImageBufferFieldDetailSpatialFirstLineEarly

A key to the spatial first line early detail field of the image buffer.

## Declaration

```swift
let kCVImageBufferFieldDetailSpatialFirstLineEarly: CFString
```

## Discussion

Discussion The spatial first line early detail field value is of type CFString. The image buffer contains interleaved fields. The first line of image data corresponds to the first top, odd-numbered, field.

## See Also

### Constants

- [kCVImageBufferFieldDetailTemporalTopFirst](corevideo/kcvimagebufferfielddetailtemporaltopfirst.md)
- [kCVImageBufferFieldDetailTemporalBottomFirst](corevideo/kcvimagebufferfielddetailtemporalbottomfirst.md)
- [kCVImageBufferFieldDetailSpatialFirstLineLate](corevideo/kcvimagebufferfielddetailspatialfirstlinelate.md)