libcamera: pipeline_handler: Move CameraData members to Camera::Private

With pipeline handlers now being able to subclass Camera::Private, start
the migration from CameraData to Camera::Private by moving the members
of the base CameraData class. The controlInfo_, properties_ and pipe_
members are duplicated for now, to allow migrating pipeline handlers one
by one.

The Camera::Private class is now properly documented, don't exclude it
from documentation generation.

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

Documentation/Doxyfile.in

@@ -882,7 +882,6 @@ EXCLUDE_SYMBOLS        = libcamera::BoundMethodArgs \
                          libcamera::BoundMethodPack \
                          libcamera::BoundMethodPackBase \
                          libcamera::BoundMethodStatic \
-                         libcamera::Camera::Private \
                          libcamera::CameraManager::Private \
                          libcamera::SignalBase \
                          *::details \

include/libcamera/internal/camera.h

@@ -8,6 +8,7 @@
 #define __LIBCAMERA_INTERNAL_CAMERA_H__
 
 #include <atomic>
+#include <list>
 #include <memory>
 #include <set>
 #include <string>
@@ -29,6 +30,14 @@ public:
 	Private(PipelineHandler *pipe);
 	~Private();
 
+	PipelineHandler *pipe() { return pipe_.get(); }
+
+	std::list<Request *> queuedRequests_;
+	ControlInfoMap controlInfo_;
+	ControlList properties_;
+
+	uint32_t requestSequence_;
+
 private:
 	enum State {
 		CameraAvailable,

include/libcamera/internal/pipeline_handler.h

@@ -7,7 +7,6 @@
 #ifndef __LIBCAMERA_INTERNAL_PIPELINE_HANDLER_H__
 #define __LIBCAMERA_INTERNAL_PIPELINE_HANDLER_H__
 
-#include <list>
 #include <map>
 #include <memory>
 #include <set>
@@ -39,18 +38,15 @@ class CameraData
 {
 public:
 	explicit CameraData(PipelineHandler *pipe)
-		: pipe_(pipe), requestSequence_(0)
+		: pipe_(pipe)
 	{
 	}
 	virtual ~CameraData() = default;
 
 	PipelineHandler *pipe_;
-	std::list<Request *> queuedRequests_;
 	ControlInfoMap controlInfo_;
 	ControlList properties_;
 
-	uint32_t requestSequence_;
-
 private:
 	LIBCAMERA_DISABLE_COPY(CameraData)
 };

src/libcamera/camera.cpp

@@ -332,13 +332,25 @@ std::size_t CameraConfiguration::size() const
  * \brief The vector of stream configurations
  */
 
+/**
+ * \class Camera::Private
+ * \brief Base class for camera private data
+ *
+ * The Camera::Private class stores all private data associated with a camera.
+ * In addition to hiding core Camera data from the public API, it is expected to
+ * be subclassed by pipeline handlers to store pipeline-specific data.
+ *
+ * Pipeline handlers can obtain the Camera::Private instance associated with a
+ * camera by calling Camera::_d().
+ */
+
 /**
  * \brief Construct a Camera::Private instance
  * \param[in] pipe The pipeline handler responsible for the camera device
  */
 Camera::Private::Private(PipelineHandler *pipe)
-	: pipe_(pipe->shared_from_this()), disconnected_(false),
-	  state_(CameraAvailable)
+	: requestSequence_(0), pipe_(pipe->shared_from_this()),
+	  disconnected_(false), state_(CameraAvailable)
 {
 }
 
@@ -348,6 +360,55 @@ Camera::Private::~Private()
 		LOG(Camera, Error) << "Removing camera while still in use";
 }
 
+/**
+ * \fn Camera::Private::pipe()
+ * \brief Retrieve the pipeline handler related to this camera
+ * \return The pipeline handler that created this camera
+ */
+
+/**
+ * \var Camera::Private::queuedRequests_
+ * \brief The list of queued and not yet completed request
+ *
+ * The list of queued request is used to track requests queued in order to
+ * ensure completion of all requests when the pipeline handler is stopped.
+ *
+ * \sa PipelineHandler::queueRequest(), PipelineHandler::stop(),
+ * PipelineHandler::completeRequest()
+ */
+
+/**
+ * \var Camera::Private::controlInfo_
+ * \brief The set of controls supported by the camera
+ *
+ * The control information shall be initialised by the pipeline handler when
+ * creating the camera.
+ *
+ * \todo This member was initially meant to stay constant after the camera is
+ * created. Several pipeline handlers are already updating it when the camera
+ * is configured. Update the documentation accordingly, and possibly the API as
+ * well, when implementing official support for control info updates.
+ */
+
+/**
+ * \var Camera::Private::properties_
+ * \brief The list of properties supported by the camera
+ *
+ * The list of camera properties shall be initialised by the pipeline handler
+ * when creating the camera, and shall not be modified afterwards.
+ */
+
+/**
+ * \var Camera::Private::requestSequence_
+ * \brief The queuing sequence of the request
+ *
+ * When requests are queued, they are given a per-camera sequence number to
+ * facilitate debugging of internal request usage.
+ *
+ * The requestSequence_ tracks the number of requests queued to a camera
+ * over its lifetime.
+ */
+
 static const char *const camera_state_names[] = {
 	"Available",
 	"Acquired",

src/libcamera/pipeline/rkisp1/rkisp1.cpp

@@ -847,7 +847,7 @@ void PipelineHandlerRkISP1::stop(Camera *camera)
 		LOG(RkISP1, Warning)
 			<< "Failed to stop parameters for " << camera->id();
 
-	ASSERT(data->queuedRequests_.empty());
+	ASSERT(camera->_d()->queuedRequests_.empty());
 	data->frameInfo_.clear();
 
 	freeBuffers(camera);

src/libcamera/pipeline_handler.cpp

@@ -16,6 +16,7 @@
 #include <libcamera/camera_manager.h>
 #include <libcamera/framebuffer.h>
 
+#include "libcamera/internal/camera.h"
 #include "libcamera/internal/device_enumerator.h"
 #include "libcamera/internal/media_device.h"
 #include "libcamera/internal/tracepoints.h"
@@ -71,17 +72,6 @@ LOG_DEFINE_CATEGORY(Pipeline)
  * and remains valid until the instance is destroyed.
  */
 
-/**
- * \var CameraData::queuedRequests_
- * \brief The list of queued and not yet completed request
- *
- * The list of queued request is used to track requests queued in order to
- * ensure completion of all requests when the pipeline handler is stopped.
- *
- * \sa PipelineHandler::queueRequest(), PipelineHandler::stop(),
- * PipelineHandler::completeRequest()
- */
-
 /**
  * \var CameraData::controlInfo_
  * \brief The set of controls supported by the camera
@@ -98,17 +88,6 @@ LOG_DEFINE_CATEGORY(Pipeline)
  * when creating the camera, and shall not be modified afterwards.
  */
 
-/**
- * \var CameraData::requestSequence_
- * \brief The queuing sequence of the request
- *
- * When requests are queued, they are given a per-camera sequence number to
- * facilitate debugging of internal request usage.
- *
- * The requestSequence_ tracks the number of requests queued to a camera
- * over its lifetime.
- */
-
 /**
  * \class PipelineHandler
  * \brief Create and manage cameras based on a set of media devices
@@ -254,8 +233,7 @@ void PipelineHandler::unlock()
  */
 const ControlInfoMap &PipelineHandler::controls(const Camera *camera) const
 {
-	const CameraData *data = cameraData(camera);
-	return data->controlInfo_;
+	return camera->_d()->controlInfo_;
 }
 
 /**
@@ -265,8 +243,7 @@ const ControlInfoMap &PipelineHandler::controls(const Camera *camera) const
  */
 const ControlList &PipelineHandler::properties(const Camera *camera) const
 {
-	const CameraData *data = cameraData(camera);
-	return data->properties_;
+	return camera->_d()->properties_;
 }
 
 /**
@@ -380,8 +357,7 @@ const ControlList &PipelineHandler::properties(const Camera *camera) const
  */
 bool PipelineHandler::hasPendingRequests(const Camera *camera) const
 {
-	const CameraData *data = cameraData(camera);
-	return !data->queuedRequests_.empty();
+	return !camera->_d()->queuedRequests_.empty();
 }
 
 /**
@@ -406,7 +382,7 @@ void PipelineHandler::queueRequest(Request *request)
 	LIBCAMERA_TRACEPOINT(request_queue, request);
 
 	Camera *camera = request->camera_;
-	CameraData *data = cameraData(camera);
+	Camera::Private *data = camera->_d();
 	data->queuedRequests_.push_back(request);
 
 	request->sequence_ = data->requestSequence_++;
@@ -479,7 +455,7 @@ void PipelineHandler::completeRequest(Request *request)
 
 	request->complete();
 
-	CameraData *data = cameraData(camera);
+	Camera::Private *data = camera->_d();
 
 	while (!data->queuedRequests_.empty()) {
 		Request *req = data->queuedRequests_.front();
@@ -507,6 +483,15 @@ void PipelineHandler::completeRequest(Request *request)
 void PipelineHandler::registerCamera(std::shared_ptr<Camera> camera,
 				     std::unique_ptr<CameraData> data)
 {
+	/*
+	 * To be removed once all pipeline handlers will have migrated from
+	 * CameraData to Camera::Private.
+	 */
+	if (data) {
+		camera->_d()->controlInfo_ = std::move(data->controlInfo_);
+		camera->_d()->properties_ = std::move(data->properties_);
+	}
+
 	cameraData_[camera.get()] = std::move(data);
 	cameras_.push_back(camera);