iPhone Duo Photos & Camera Q&A

We are very interested in the new Virtual Front Camera capability on iPhone Duo. When the physical chassis opens or closes, how does the Virtual Front Camera handle the underlying optical handoff? Specifically, does this transition occur seamlessly within an active AVCaptureSession / AVCaptureVideoDataOutput pipeline without interrupting delivery of video frames, or does it trigger reconfiguration notifications that require pausing the session? Additionally, can the Virtual Front Camera be paired with a rear capture device inside an AVCaptureMultiCamSession while maintaining real-time performance and reasonable thermal headroom?

In the current Xcode iPhone Duo simulator runtime, AVCaptureDevice.DiscoverySession does not expose physical or simulated camera devices, returning empty arrays and necessitating custom synthetic mock pipelines for UI and kinematic tests. Are there plans to introduce synthetic camera device emulation directly within the Duo CoreSimulator runtime? In the interim, what is Apple’s recommended architecture for verifying camera UI, preview rendering, and capture triggers on the Duo simulator target without diverging from production AVFoundation pipelines?

Physical camera sensors deliver pixel buffers in native landscape orientation, requiring coordinate transformations when rendering into portrait or split viewports. What is the recommended pipeline design using AVCaptureDeviceDirectionCoordinator and AVCaptureDevice.RotationCoordinator to guarantee that live preview layers and photo captures remain upright across varying fold angles without manual Core Graphics or Core Image buffer rotation passes? Are there specific considerations when the view hierarchy bridges across the physical hinge division?