{
  "$schema": "https://raw.githubusercontent.com/guitaripod/wwdc-sessions/master/schema/session.schema.json",
  "schemaVersion": 1,
  "id": "wwdc2026-303",
  "event": "wwdc2026",
  "eventName": "WWDC26",
  "year": 2026,
  "eventContentId": 303,
  "title": "Build a responsive camera app that launches quickly",
  "description": "Discover how to build a camera app that launches instantly so people never miss the perfect shot. Explore how to optimize the entire camera launch sequence — from app startup to first preview frame. Ensure your app has a polished camera experience by learning about new API’s that deliver faster launches, and best practices for smooth preview rendering and maintaining sustainable performance.",
  "url": "https://developer.apple.com/videos/play/wwdc2026/303",
  "sosumiURL": "https://sosumi.ai/videos/play/wwdc2026/303",
  "type": "Video",
  "publishedAt": "2026-06-08T14:00:00-07:00",
  "platforms": [
    "iOS",
    "iPadOS"
  ],
  "keywords": [],
  "topics": [
    "Audio & Video",
    "Photos & Camera"
  ],
  "primaryTopic": "Photos & Camera",
  "duration": 1520,
  "hasTranscript": true,
  "transcriptWordCount": 2754,
  "availableLanguages": [
    "eng",
    "fra",
    "jpn",
    "kor",
    "por",
    "spa",
    "zho"
  ],
  "media": {
    "hls": "https://devstreaming-cdn.apple.com/videos/wwdc/2026/303/5/fb6dc55a-c026-4ce1-9902-7a744fef4c99/cmaf.m3u8",
    "downloadHLS": "https://devstreaming-cdn.apple.com/videos/wwdc/2026/303/5/fb6dc55a-c026-4ce1-9902-7a744fef4c99/cmaf-download.m3u8",
    "downloadSD": "https://devstreaming-cdn.apple.com/videos/wwdc/2026/303/5/fb6dc55a-c026-4ce1-9902-7a744fef4c99/downloads/wwdc2026-303_sd.mp4",
    "downloadHD": "https://devstreaming-cdn.apple.com/videos/wwdc/2026/303/5/fb6dc55a-c026-4ce1-9902-7a744fef4c99/downloads/wwdc2026-303_hd.mp4",
    "duration": 1520
  },
  "codeSnippets": [
    {
      "title": "Automatic deferred start delegate",
      "language": "swift",
      "startTimeSeconds": 554,
      "code": "import AVFoundation\n\nclass DeferredStartDelegate: NSObject, AVCaptureSessionDeferredStartDelegate {\n    func sessionWillRunDeferredStart(_ session: AVCaptureSession)\n    {\n        // This is called before deferred start begins for the deferred outputs\n    }\n\n    func sessionDidRunDeferredStart(_ session: AVCaptureSession)\n    {\n        // This is called after deferred start completes for all outputs\n    }\n}"
    },
    {
      "title": "Adopt automatic deferred start",
      "language": "swift",
      "startTimeSeconds": 586,
      "code": "import AVFoundation\n\nlet captureSession = AVCaptureSession()\ncaptureSession.beginConfiguration()\ncaptureSession.automaticallyRunsDeferredStart = true\n\nlet videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)\nvideoPreviewLayer.isDeferredStartEnabled = false\n\nlet photoOutput = AVCapturePhotoOutput()\nphotoOutput.isDeferredStartEnabled = true\ncaptureSession.addOutput(photoOutput)\n\ncaptureSession.setDeferredStartDelegate(deferredStartDelegate, deferredStartDelegateCallbackQueue: sessionQueue)\n\ncaptureSession.commitConfiguration()\ncaptureSession.startRunning()"
    },
    {
      "title": "Adopt manual deferred start",
      "language": "swift",
      "startTimeSeconds": 690,
      "code": "import AVFoundation\n\nlet captureSession = AVCaptureSession()\ncaptureSession.beginConfiguration()\ncaptureSession.automaticallyRunsDeferredStart = false\n\nlet videoOutput = AVCaptureVideoDataOutput()\ncaptureSession.addOutput(videoOutput)\nvideoOutput.isDeferredStartEnabled = false\n\nlet photoOutput = AVCapturePhotoOutput()\nphotoOutput.isDeferredStartEnabled = true\ncaptureSession.addOutput(photoOutput)\n\ncaptureSession.setDeferredStartDelegate(deferredStartDelegate, deferredStartDelegateCallbackQueue: sessionQueue)\n\ncaptureSession.commitConfiguration()\ncaptureSession.startRunning()"
    },
    {
      "title": "Manage runDeferredStartWhenNeeded",
      "language": "swift",
      "startTimeSeconds": 713,
      "code": "import AVFoundation\nimport QuartzCore\n\nprivate var firstFramePresented = false\nguard let drawable = layer.nextDrawable()\nif (!firstFramePresented) {\n    drawable.addPresentedHandler({ drawable in\n        // Set up postponed UI elements\n        captureSession.runDeferredStartWhenNeeded()\n    })\n    firstFramePresented = true\n}"
    },
    {
      "title": "Enable responsive capture",
      "language": "swift",
      "startTimeSeconds": 847,
      "code": "import AVFoundation\n\nfunc configurePhotoOutput(for session: AVCaptureSession, device: AVCaptureDevice) {\n    let photoOutput = AVCapturePhotoOutput()\n\n    guard session.canAddOutput(photoOutput) else { return }\n    session.addOutput(photoOutput)\n\n    photoOutput.maxPhotoQualityPrioritization = .quality\n    // Responsive capture lets the photo output capture immediately\n    photoOutput.isResponsiveCaptureEnabled = photoOutput.isResponsiveCaptureSupported\n}"
    },
    {
      "title": "Monitor for system pressure",
      "language": "swift",
      "startTimeSeconds": 1216,
      "code": "import AVFoundation\n\nlet captureSession = AVCaptureSession()\nlet device = activeVideoInput?.device\ncaptureSession.beginConfiguration()\n// ...\ncaptureSession.commitConfiguration()\n\nguard captureSession.hardwareCost <= 1.0 else {\n    print(\"hardwareCost \\(captureSession.hardwareCost) — cannot start session. Reconfiguring.\")\n    setupLowCostConfiguration()\n}\n\ncaptureSession.startRunning()\nlet systemPressureObserver = device?.observe(\\.systemPressureState,\n                                               options: [.initial, .new],\n                                               changeHandler: { /* Handle state change */ })"
    },
    {
      "title": "Manage pro video storage",
      "language": "swift",
      "startTimeSeconds": 1337,
      "code": "import AVFoundation\n\nfunc configureProVideoStorage() {\n    guard AVProVideoStorage.isSupported else { return }\n    let storage = AVProVideoStorage.shared\n    guard storage.remainingCapacity != 0 else {\n        storage.openSettings()\n        return\n    }\n}"
    },
    {
      "title": "Adopt AVProVideoStorage for deterministic file write speeds",
      "language": "swift",
      "startTimeSeconds": 1363,
      "code": "import AVFoundation\n\nguard AVProVideoStorage.isSupported else { return }\nguard let pvs = AVProVideoStorage.shared else { return }\n\n// Configure and set up AVCaptureSession, AVCaptureConnections and format\n// ...\nlet movieOutput = AVCaptureMovieFileOutput()\n\nguard movieOutput.isProVideoStorageSupported else { return }\nguard !pvs.isBusy else { return }\n\nlet movieFileURL = FileManager.default.temporaryDirectory\n            .appendingPathComponent(UUID().uuidString)\n            .appendingPathExtension(\"mov\")\n\nmovieOutput.usesProVideoStorage = true // Also available with AVAssetWriter\nmovieOutput.startRecording(to: movieFileURL, recordingDelegate: delegate)"
    }
  ],
  "resources": [
    {
      "title": "Build a responsive camera app that launches quickly",
      "url": "https://developer.apple.com/documentation/AVFoundation/build-a-responsive-camera-app-that-launches-quickly",
      "type": "samplecode",
      "description": "Build a fast camera launch experience for your iOS and iPadOS apps.",
      "sosumiURL": "https://sosumi.ai/documentation/AVFoundation/build-a-responsive-camera-app-that-launches-quickly",
      "doccJSON": "https://developer.apple.com/tutorials/data/documentation/AVFoundation/build-a-responsive-camera-app-that-launches-quickly.json"
    },
    {
      "title": "Performance and metrics",
      "url": "https://developer.apple.com/documentation/Xcode/performance-and-metrics",
      "type": "documentation",
      "description": "Measure, investigate, and address the use of system resources and issues impacting performance using Instruments and Xcode Organizer.",
      "sosumiURL": "https://sosumi.ai/documentation/Xcode/performance-and-metrics",
      "doccJSON": "https://developer.apple.com/tutorials/data/documentation/Xcode/performance-and-metrics.json"
    },
    {
      "title": "AVCam: Building a camera app",
      "url": "https://developer.apple.com/documentation/AVFoundation/avcam-building-a-camera-app",
      "type": "samplecode",
      "description": "Capture photos and record video using the front and rear iPhone and iPad cameras.",
      "sosumiURL": "https://sosumi.ai/documentation/AVFoundation/avcam-building-a-camera-app",
      "doccJSON": "https://developer.apple.com/tutorials/data/documentation/AVFoundation/avcam-building-a-camera-app.json"
    }
  ],
  "path": "sessions/wwdc2026/303-build-a-responsive-camera-app-that-launches-quickly/",
  "files": {
    "metadata": "sessions/wwdc2026/303-build-a-responsive-camera-app-that-launches-quickly/metadata.json",
    "readme": "sessions/wwdc2026/303-build-a-responsive-camera-app-that-launches-quickly/README.md",
    "transcript": "sessions/wwdc2026/303-build-a-responsive-camera-app-that-launches-quickly/transcript.md",
    "transcriptJSON": "sessions/wwdc2026/303-build-a-responsive-camera-app-that-launches-quickly/transcript.json"
  }
}