libcamera: camera_manager: add CameraManager class

Provide a CameraManager class which will handle listing, instancing,
destruction and lifetime management of cameras.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/camera_manager.h

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2018, Google Inc.
+ *
+ * camera_manager.h - Camera management
+ */
+#ifndef __LIBCAMERA_CAMERA_MANAGER_H__
+#define __LIBCAMERA_CAMERA_MANAGER_H__
+
+#include <vector>
+#include <string>
+
+namespace libcamera {
+
+class Camera;
+class DeviceEnumerator;
+class PipelineHandler;
+
+class CameraManager
+{
+public:
+	CameraManager();
+
+	int start();
+	void stop();
+
+	std::vector<std::string> list() const;
+	Camera *get(const std::string &name);
+	void put(Camera *camera);
+
+private:
+	DeviceEnumerator *enumerator_;
+	std::vector<PipelineHandler *> pipes_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_CAMERA_MANAGER_H__ */

include/libcamera/libcamera.h

@@ -8,6 +8,7 @@
 #define __LIBCAMERA_LIBCAMERA_H__
 
 #include <libcamera/camera.h>
+#include <libcamera/camera_manager.h>
 
 namespace libcamera {
 

include/libcamera/meson.build

@@ -1,5 +1,6 @@
 libcamera_api = files([
     'camera.h',
+    'camera_manager.h',
     'libcamera.h',
 ])