---
title: leadingFrames
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudioconverterprimeinfo/leadingframes
---

# leadingFrames

The number of leading (previous) input frames the converter requires to perform a high-quality conversion.

## Declaration

```swift
var leadingFrames: AVAudioFrameCount
```

## See Also

### Getting Frame Properties

- [trailingFrames](avfaudio/avaudioconverterprimeinfo/trailingframes.md)