iris_camera

📸 iOS + Android + Web camera toolkit for Flutter, powered by AVFoundation, CameraX, and browser MediaDevices API. Render the native preview, switch lenses, stream frames, capture photos, record video, tune exposure/white balance/torch/zoom, and listen to lifecycle + orientation + AF/AE state – all from Dart.

Platform coverage: iOS + Android + Web. Other platforms no-op safely.

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Highlights

• 🔍 Lens discovery & switching – list every lens (front included by default; exclude with includeFrontCameras: false) and reconfigure with switchLens.
• 🖼️ Native preview widget – IrisCameraPreview wraps AVCaptureVideoPreviewLayer with tap-to-focus + overlay hooks.
• 📸 Still capture – capturePhoto with flash/ISO/exposure overrides. Long exposure is supported; query the device max via getMaxExposureDuration.
• 📸 Burst – captureBurst(count, options) supports long exposure/ISO overrides, optional file saving (directory, filenamePrefix), and progress events via burstProgressStream.
• 🎛️ Pro controls – focus mode/point, exposure mode/point/EV, white balance, frame rate range, torch, zoom, resolution presets.
• 📡 Streams – live BGRA image stream, orientation stream, lifecycle state stream, AF/AE state stream.
• 🔧 Lifecycle – explicit initialize/pause/resume/dispose and structured errors via IrisCameraException.
• 🎥 Video – start/stop file-based recording (iOS/Android), optional audio.

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Install

Supported platforms

• Android: minSdk 26+, targetSdk 34 (CameraX 1.3.x)
• iOS: iOS 15.0+
• Web: Modern browsers with MediaDevices API support (Chrome, Firefox, Safari, Edge)

flutter pub add iris_camera

import 'package:iris_camera/iris_camera.dart';

final camera = IrisCamera();
final lenses = await camera.listAvailableLenses(); // includeFrontCameras defaults to true
await camera.switchLens(lenses.first.category);
final photo = await camera.capturePhoto(
  options: const PhotoCaptureOptions(flashMode: PhotoFlashMode.auto),
);

Live preview:

final focusController = FocusIndicatorController();

IrisCameraPreview(
  aspectRatio: 3 / 2,
  enableTapToFocus: true,
  showFocusIndicator: true,
  onTapFocus: (point) => camera.setFocus(point: point),
  focusIndicatorController: focusController,
);

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iOS setup

Add to ios/Runner/Info.plist (both are required or the app will crash when accessing camera/mic):

<key>NSCameraUsageDescription</key>
<string>This app needs the camera to capture photos.</string>
<key>NSMicrophoneUsageDescription</key>
<string>This app needs the microphone for recording video with audio.</string>

That’s it. Permissions are requested automatically on first use.

Exclude front cameras by calling listAvailableLenses(includeFrontCameras: false).

Android setup

Add the camera permission to your app manifest (the plugin also declares it for you):

<uses-permission android:name="android.permission.CAMERA" />
<!-- Needed for video with audio -->
<uses-permission android:name="android.permission.RECORD_AUDIO" />

iris_camera will prompt for runtime permission automatically before accessing the camera. The preview is rendered via a native PreviewView, and tap-to-focus works the same as iOS.

Web setup

No additional configuration required. The browser will automatically prompt for camera permission when accessing the camera. Ensure your site is served over HTTPS (required for camera access).

Note: Some advanced features have limited support on web:

• Focus/exposure point control is simulated (browser limitation)
• White balance temperature/tint is not available
• Video recording outputs WebM format (blob URL)
• Torch/flash depends on browser and device support

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API quick reference

Key methods:

• listAvailableLenses({includeFrontCameras}) → List<CameraLensDescriptor>
• switchLens(CameraLensCategory category) → CameraLensDescriptor
• capturePhoto({PhotoCaptureOptions options}) → Uint8List
• captureBurst({count, PhotoCaptureOptions options, directory, filenamePrefix}) → List<Uint8List> or saved file paths when directory is set
• burstProgressStream → BurstProgressEvent(total, completed, status, error?)
• getMaxExposureDuration() → Duration (use to clamp long exposures)
• startVideoRecording({filePath, enableAudio}) → String path
• stopVideoRecording() → String path
• Focus: setFocus(point/lensPosition), setFocusMode, focusExposureStateStream
• Exposure: setExposureMode, setExposurePoint, setExposureOffset, getMin/MaxExposureOffset, getExposureOffsetStepSize
• Zoom/torch/WB: setZoom, setTorch, setWhiteBalance
• Frame/format: setFrameRateRange, setResolutionPreset
• Streams: imageStream, orientationStream, stateStream
• Lifecycle: initialize, pauseSession, resumeSession, disposeSession
• Errors: IrisCameraException(code, message, details)

Data classes:

• CameraLensDescriptor (id, name, position, category, supportsFocus, optional focalLength, fieldOfView)
• PhotoCaptureOptions (flashMode, exposureDuration, iso)
• OrientationEvent, CameraStateEvent, FocusExposureStateEvent, IrisImageFrame

Widget:

• IrisCameraPreview with tap-to-focus + focus indicator styling/control.

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iris_camera vs camera (iOS/Android)

Capability	iris_camera	camera
Still photos	✅ Shared session JPEG capture	✅
Live preview widget	✅ IrisCameraPreview (iOS/Android/Web)	✅
Lens discovery/switching	✅ Enumerate + switch by category (wide/ultraWide/telephoto/etc.), front opt-in	⚪️ List only (no switching API)
Tap/manual focus	✅ Tap/point focus; iOS also supports lensPosition	✅
Exposure controls	✅ mode/point/EV/ISO/exposure duration	✅ (mode/point/offset)
White balance override	✅ iOS: temperature/tint; Android: auto/lock only	⚪️ (not exposed)
Zoom	✅	✅
Torch	✅ (torch separate from flash)	✅
Frame rate range	✅ min/max FPS	⚪️ limited
Resolution preset	✅	✅
Live image stream	✅ BGRA	✅
Orientation stream	✅ device/video	✅
AF/AE state stream	✅	⚪️ basic focus/exposure mode only
Lifecycle controls	✅ initialize/pause/resume/dispose + state stream	✅ (controller init/dispose)
Video recording	✅ (iOS/Android/Web)	✅
Web	✅ (MediaDevices API)	✅

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Example flow

final lenses = await camera.listAvailableLenses();
final tele = lenses.firstWhere(
  (lens) => lens.category == CameraLensCategory.telephoto,
  orElse: () => lenses.first,
);

await camera.switchLens(tele.category);
await camera.initialize();
camera.stateStream.listen((event) => debugPrint('state=${event.state}'));
camera.focusExposureStateStream.listen((event) => debugPrint('af/ae=${event.state}'));

await camera.setExposureMode(ExposureMode.locked);
await camera.setFocusMode(FocusMode.locked);
final photo = await camera.capturePhoto();

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License

MIT — see LICENSE.