penguin_camera 0.0.2

Provides a platform-agnostic interface for accessing cameras camera features.

penguin_camera

A cross-platform framework for accessing various cameras and camera features available on devices, allowing you to capture pictures and videos in your applications.

On top of providing an interface that is cross platform, this also provides easy access to platform specific features.

Supported Platform

Android 16+, iOS 10.0+

Permissions

Android and iOS require permissions to access camera and audio devices, but this package doesn't provide an API to request them. Consider using permission_handler to request permissions. See the example for an example.

Use Cases

Getting Camera Device Information

final List<CameraDevice> devices = await CameraController.getAllCameraDevices();
for (CameraDevice device in devices) {
  print('CameraDevice: ${device.name}, ${device.position}');
}

Displaying a Preview

final List<CameraDevice> devices = await CameraController.getAllCameraDevices();
final CameraDevice device = devices.firstWhere(
  (CameraDevice device) => device.position == CameraPosition.back,
);

final PreviewOutput previewOutput = PreviewOutput();
final CameraController controller = CameraController(
  device: device,
  outputs: <CameraOutput>[previewOutput],
);

// This must finish before anything else is called.
await controller.initialize();

final Widget previewWidget = await previewOutput.previewWidget();

controller.start();

Taking a picture

final List<CameraDevice> devices =
    await CameraController.getAllCameraDevices();
final CameraDevice device = devices.firstWhere(
  (CameraDevice device) => device.position == CameraPosition.back,
);

final ImageCaptureOutput imageOutput = ImageCaptureOutput();
// Android requires a PreviewOutput, so it is added despite it not being used.
final CameraController controller = CameraController(
  device: device,
  outputs: <CameraOutput>[PreviewOutput(), imageOutput],
);
// This must finish before anything else is called.  
await controller.initialize();
controller.start();

imageOutput.takePicture((Uint8List data) {
  print(data.length);
});

controller.stop();
controller.dispose();

Recording a Video

final List<CameraDevice> devices =
    await CameraController.getAllCameraDevices();
final CameraDevice device = devices.firstWhere(
      (CameraDevice device) => device.position == CameraPosition.back,
);

final VideoCaptureOutput videoOutput = VideoCaptureOutput();
// Android requires a PreviewOutput, so it is added despite it not being used.
final CameraController controller = CameraController(
  device: device,
  outputs: <CameraOutput>[PreviewOutput(), videoOutput],
);
// This must finish before anything else is called.
await controller.initialize();
controller.start();

videoOutput.startRecording(fileOutput: 'myFile');
videoOutput.stopRecording();

controller.stop();
controller.dispose();

Setting Exposure

final CameraController controller = ....
final List<ExposureMode> modes = await controller.supportedExposureModes();
if (modes.contains(ExposureMode.continuous)) {
  controller.setExposureMode(ExposureMode.continuous);
}

Setting Focus

final CameraController controller = ....
final List<FocusMode> modes = await controller.supportedFocusModes();
if (modes.contains(FocusMode.continuousImageAutoFocus)) {
  controller.setFocusMode(FocusMode.continuousImageAutoFocus);
}

Setting Zoom

final CameraController controller = ....
if (await controller.zoomSupported()) {
  final double minZoom = await controller.minZoom();
  final double maxZoom = await controller.maxZoom();
  controller.setZoom((maxZoom + minZoom) / 2);
}

Get Output Size

Every class that extends CameraOutput must return an output size if a CameraControllerPreset is set.

final List<CameraDevice> devices =
    await CameraController.getAllCameraDevices();
final CameraDevice device = devices.firstWhere(
      (CameraDevice device) => device.position == CameraPosition.back,
);

final PreviewOutput previewOutput = PreviewOutput();
final CameraController controller = CameraController(
  device: device,
  outputs: <CameraOutput>[previewOutput],
);

// This must complete to guarantee CameraOutput.outputSize() returns non-null.
await controller.setControllerPreset(CameraControllerPreset.high);
final Size? outputSize = await previewOutput.outputSize();

Setting Flash

final List<CameraDevice> devices = await CameraController.getAllCameraDevices();
final CameraDevice device = devices.firstWhere(
  (CameraDevice device) => device.position == CameraPosition.back,
);

final ImageCaptureOutput imageOutput = ImageCaptureOutput();
// Android requires a PreviewOutput, so it is added despite it not being used.
final CameraController controller = CameraController(
  device: device,
  outputs: <CameraOutput>[PreviewOutput(), imageOutput],
);
// This must finish before anything else is called.
await controller.initialize();

final List<FlashMode> modes = await imageOutput.supportedFlashModes();
if (modes.contains(FlashMode.auto)) {
  imageOutput.setFlashMode(FlashMode.auto);
}

Using Android Specific Feature

import 'package:penguin_camera/penguin_camera.dart';
import 'package:penguin_camera/android.dart' as android;

final CameraController controller = ....
if (defaultTargetPlatform == TargetPlatform.android) {
  final android.CameraController androidController =
      controller as android.CameraController;

  final android.CameraParameters parameters =
      androidController.cameraParameters;
  parameters.setColorEffect(android.CameraParameters.effectNegative);
  androidController.camera.setParameters(parameters);
}

Using iOS Specific Feature

import 'package:penguin_camera/penguin_camera.dart';
import 'package:penguin_camera/ios.dart' as ios;

final CameraController controller = ....
if (defaultTargetPlatform == TargetPlatform.iOS) {
  final ios.CameraController iosController =
      controller as ios.CameraController;

  iosController.session.setSessionPreset(ios.CaptureSessionPreset.photo);
}