LCamDev: implement configureSessionModeCReq

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

commonLibs/lcameraDev/cameraSession.cpp

@@ -1,4 +1,7 @@
+#include <boostAsioLinkageFix.h>
+
 #include <cameraSession.h>
+#include <sessionModeConfigure.h>
 #include <stdexcept>
 
 namespace lcamera_dev {
@@ -26,4 +29,56 @@ bool CameraSession::decrementRefcount()
 	return s.rsrc.refcount == 0;
 }
 
+sscl::co::ViralNonPostingInvoker<LcameraDevConfiguredCameraMode>
+CameraSession::configureSessionModeCReq(
+	const LcameraDevCameraModeRequest& request)
+{
+	sscl::co::CoQutex::ReleaseHandle sessionGuard =
+		co_await s.lock.getAcquireInvocationAndSuspensionPolicy();
+
+	if (s.rsrc.isStreaming)
+	{
+		throw std::runtime_error(
+			"lcameraDev: cannot configure session mode while streaming");
+	}
+
+	validateCameraModeRequest(request);
+	rejectFullPlanarOptionalAtConfigureApi(request);
+
+	if (s.rsrc.configuredMode.has_value()
+		&& cameraModeRequestsEqual(s.rsrc.configuredRequest, request))
+	{
+		co_return *s.rsrc.configuredMode;
+	}
+
+	if (s.rsrc.configuredMode.has_value())
+	{
+		throw std::runtime_error(
+			"lcameraDev: conflicting camera mode request on configured "
+			"session");
+	}
+
+	std::shared_ptr<libcamera::CameraConfiguration> heldConfiguration;
+	const LcameraDevConfiguredCameraMode resolvedMode =
+		configureLibcameraSessionMode(
+			s.rsrc.camera,
+			request,
+			heldConfiguration);
+
+	const ConfigureSessionModeStatus status =
+		applyModeRequestToSessionState(
+			s.rsrc,
+			request,
+			resolvedMode,
+			heldConfiguration);
+
+	if (status != ConfigureSessionModeStatus::Configured)
+	{
+		throw std::logic_error(
+			"lcameraDev: unexpected configure session mode status");
+	}
+
+	co_return *s.rsrc.configuredMode;
+}
+
 } // namespace lcamera_dev