<!--
{
  "availability" : [
    "iOS: 11.0.0 -",
    "iPadOS: 11.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.13.0 -",
    "tvOS: 11.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 4.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AVFAudio",
  "identifier" : "/documentation/AVFAudio/AVAudioEngineManualRenderingMode/realtime",
  "metadataVersion" : "0.1.0",
  "role" : "Case",
  "symbol" : {
    "kind" : "Case",
    "modules" : [
      "AVFAudio"
    ],
    "preciseIdentifier" : "c:@E@AVAudioEngineManualRenderingMode@AVAudioEngineManualRenderingModeRealtime"
  },
  "title" : "AVAudioEngineManualRenderingMode.realtime"
}
-->

# AVAudioEngineManualRenderingMode.realtime

An engine that operates under real-time constraints and doesn’t make blocking calls while rendering.

```
case realtime
```

## Discussion

You can only use the block-based render mechanism in this mode. See [`manualRenderingBlock`](/documentation/AVFAudio/AVAudioEngine/manualRenderingBlock).

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)