libcamera: camera: Associate cameras with their pipeline handler

The PipelineHandler which creates a Camera is responsible for serving
any operation requested by the user. In order forward the public API
calls, the camera needs to store a reference to its pipeline handler.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes since v1:

- Create pipeline handlers is shared pointers, make them inherit from
  std::enable_shared_from_this<> and stored them in shared pointers.

include/libcamera/camera.h

@@ -12,10 +12,13 @@
 
 namespace libcamera {
 
+class PipelineHandler;
+
 class Camera final
 {
 public:
-	static std::shared_ptr<Camera> create(const std::string &name);
+	static std::shared_ptr<Camera> create(PipelineHandler *pipe,
+					      const std::string &name);
 
 	Camera(const Camera &) = delete;
 	void operator=(const Camera &) = delete;
@@ -23,9 +26,10 @@ public:
 	const std::string &name() const;
 
 private:
-	explicit Camera(const std::string &name);
+	Camera(PipelineHandler *pipe, const std::string &name);
 	~Camera();
 
+	std::shared_ptr<PipelineHandler> pipe_;
 	std::string name_;
 };
 

include/libcamera/camera_manager.h

@@ -41,7 +41,7 @@ private:
 	~CameraManager();
 
 	std::unique_ptr<DeviceEnumerator> enumerator_;
-	std::vector<PipelineHandler *> pipes_;
+	std::vector<std::shared_ptr<PipelineHandler>> pipes_;
 	std::vector<std::shared_ptr<Camera>> cameras_;
 
 	std::unique_ptr<EventDispatcher> dispatcher_;