android: camera_device: Make CameraDevice a shared object

CameraDevice needs to be wrapper into the std::shared_ptr instead
of std::unique_ptr to enable refcounting. The refcounting will help
us to support hotplug and hot-unplug CameraHalManager operations
in the subsequent commit.

Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/android/camera_device.cpp

@@ -233,6 +233,13 @@ CameraDevice::~CameraDevice()
 		delete it.second;
 }
 
+std::shared_ptr<CameraDevice> CameraDevice::create(unsigned int id,
+						   const std::shared_ptr<Camera> &cam)
+{
+	CameraDevice *camera = new CameraDevice(id, cam);
+	return std::shared_ptr<CameraDevice>(camera);
+}
+
 /*
  * Initialize the camera static information.
  * This method is called before the camera device is opened.

src/android/camera_device.h

@@ -47,7 +47,8 @@ struct CameraStream {
 class CameraDevice : protected libcamera::Loggable
 {
 public:
-	CameraDevice(unsigned int id, const std::shared_ptr<libcamera::Camera> &camera);
+	static std::shared_ptr<CameraDevice> create(unsigned int id,
+						    const std::shared_ptr<libcamera::Camera> &cam);
 	~CameraDevice();
 
 	int initialize();
@@ -72,6 +73,8 @@ protected:
 	std::string logPrefix() const override;
 
 private:
+	CameraDevice(unsigned int id, const std::shared_ptr<libcamera::Camera> &camera);
+
 	struct Camera3RequestDescriptor {
 		Camera3RequestDescriptor(unsigned int frameNumber,
 					 unsigned int numBuffers);

src/android/camera_hal_manager.cpp

@@ -64,12 +64,12 @@ int CameraHalManager::init()
 	 */
 	unsigned int index = 0;
 	for (auto &cam : cameraManager_->cameras()) {
-		CameraDevice *camera = new CameraDevice(index, cam);
+		std::shared_ptr<CameraDevice> camera = CameraDevice::create(index, cam);
 		ret = camera->initialize();
 		if (ret)
 			continue;
 
-		cameras_.emplace_back(camera);
+		cameras_.emplace_back(std::move(camera));
 		++index;
 	}
 

src/android/camera_hal_manager.h

@@ -36,7 +36,7 @@ private:
 	libcamera::CameraManager *cameraManager_;
 
 	const camera_module_callbacks_t *callbacks_;
-	std::vector<std::unique_ptr<CameraDevice>> cameras_;
+	std::vector<std::shared_ptr<CameraDevice>> cameras_;
 };
 
 #endif /* __ANDROID_CAMERA_MANAGER_H__ */