libcamera: camera: Move Camera::Private to header file

The Camera::Private class is defined in camera.cpp. To prepare for
allowing it to be subclassed by pipeline handlers, move it to a new
internal/camera.h header.

The \file comment block in camera.cpp now needs to explicitly tell which
camera.h file it refers to.

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

include/libcamera/internal/camera.h

@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * camera.h - Camera private data
+ */
+#ifndef __LIBCAMERA_INTERNAL_CAMERA_H__
+#define __LIBCAMERA_INTERNAL_CAMERA_H__
+
+#include <atomic>
+#include <memory>
+#include <set>
+#include <string>
+
+#include <libcamera/base/class.h>
+
+#include <libcamera/camera.h>
+
+namespace libcamera {
+
+class PipelineHandler;
+class Stream;
+
+class Camera::Private : public Extensible::Private
+{
+	LIBCAMERA_DECLARE_PUBLIC(Camera)
+
+public:
+	enum State {
+		CameraAvailable,
+		CameraAcquired,
+		CameraConfigured,
+		CameraStopping,
+		CameraRunning,
+	};
+
+	Private(PipelineHandler *pipe, const std::string &id,
+		const std::set<Stream *> &streams);
+	~Private();
+
+	bool isRunning() const;
+	int isAccessAllowed(State state, bool allowDisconnected = false,
+			    const char *from = __builtin_FUNCTION()) const;
+	int isAccessAllowed(State low, State high,
+			    bool allowDisconnected = false,
+			    const char *from = __builtin_FUNCTION()) const;
+
+	void disconnect();
+	void setState(State state);
+
+	std::shared_ptr<PipelineHandler> pipe_;
+	std::string id_;
+	std::set<Stream *> streams_;
+	std::set<const Stream *> activeStreams_;
+
+private:
+	bool disconnected_;
+	std::atomic<State> state_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_INTERNAL_CAMERA_H__ */

include/libcamera/internal/meson.build

@@ -12,6 +12,7 @@ libcamera_tracepoint_header = custom_target(
 libcamera_internal_headers = files([
     'bayer_format.h',
     'byte_stream_buffer.h',
+    'camera.h',
     'camera_controls.h',
     'camera_sensor.h',
     'camera_sensor_properties.h',