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Attribution

VirtualDisplayKit is a derivative work of DeskPad by Bastian Andelefski.

Relationship to DeskPad

DeskPad is the foundation for virtual display creation and CGDisplayStream-based preview functionality in this project. The CGVirtualDisplayPrivate.h private API declarations and the core approach to managing CGVirtualDisplay instances were derived from DeskPad's implementation.

Files derived from DeskPad

  • Sources/CVirtualDisplayPrivate/include/CGVirtualDisplayPrivate.h — private API declarations for CGVirtualDisplay
  • Sources/VirtualDisplayKit/Core/VirtualDisplay.swift — core virtual display creation, configuration, and retry logic
  • Sources/VirtualDisplayKit/Core/DisplayStreamRenderer.swift — CGDisplayStream setup and frame callback handling

What VirtualDisplayKit adds

VirtualDisplayKit extends the original DeskPad concept with:

  • A full Swift Package Manager module with a public API surface
  • DisplayRecorder — records virtual display content to H.264/HEVC MP4/MOV files via AVAssetWriter
  • FrameOutputStream — emits encoded H.264/HEVC Annex-B or raw CVPixelBuffer frames for RTMP streaming, OBS integration, or custom pipelines, via VTCompressionSession
  • VirtualDisplayController — high-level facade combining display, recording, and streaming
  • SwiftUI (VirtualDisplayView) and AppKit (VirtualDisplayNSView) view layers
  • Preset configurations for common use cases including digital signage (portrait 1080p / 4K) and landscape 1080p / 4K
  • Concurrency-safe APIs using Swift 5.9 strict concurrency features
  • Demo application and integration examples

Gratitude

Thank you to Bastian Andelefski for open-sourcing DeskPad under a permissive license. This project would not exist without that foundation.