LCamDev: implement configureSessionModeCReq

We can, theoretically, now change the v4l camera's mode.

commonLibs/lcameraDev/cameraSession.h

@@ -2,9 +2,13 @@
 #define LCAMERA_DEV_CAMERA_SESSION_H
 
 #include <cameraIdentity.h>
+#include <cameraModeRequest.h>
 #include <libcamera/camera.h>
 #include <memory>
+#include <optional>
+#include <stdexcept>
 #include <spinscale/co/coQutex.h>
+#include <spinscale/co/invokers.h>
 #include <spinscale/sharedResourceGroup.h>
 
 namespace lcamera_dev {
@@ -20,6 +24,12 @@ struct CameraSessionResources
 	int refcount = 0;
 	CameraIdentityRecord identity;
 	std::shared_ptr<libcamera::Camera> camera;
+
+	bool isStreaming = false;
+	LcameraDevCameraModeRequest configuredRequest;
+	std::optional<LcameraDevConfiguredCameraMode> configuredMode;
+	std::shared_ptr<libcamera::CameraConfiguration> heldConfiguration;
+	int libcameraConfigureCallCount = 0;
 };
 
 class CameraSession
@@ -35,9 +45,29 @@ public:
 	const std::shared_ptr<libcamera::Camera>& getCamera() const
 		{ return s.rsrc.camera; }
 
+	bool isModeConfigured() const
+		{ return s.rsrc.configuredMode.has_value(); }
+
+	const LcameraDevConfiguredCameraMode& getConfiguredMode() const
+	{
+		if (!s.rsrc.configuredMode.has_value())
+		{
+			throw std::logic_error(
+				"lcameraDev: session mode is not configured");
+		}
+
+		return *s.rsrc.configuredMode;
+	}
+
+	int getLibcameraConfigureCallCount() const
+		{ return s.rsrc.libcameraConfigureCallCount; }
+
 	void incrementRefcount();
 	bool decrementRefcount();
 
+	sscl::co::ViralNonPostingInvoker<LcameraDevConfiguredCameraMode>
+	configureSessionModeCReq(const LcameraDevCameraModeRequest& request);
+
 	sscl::SharedResourceGroup<sscl::co::CoQutex, CameraSessionResources> s;
 };