LCamDev: implement configureSessionModeCReq

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

commonLibs/lcameraDev/cameraModeRequest.cpp

@@ -0,0 +1,50 @@
+#include <cameraModeRequest.h>
+#include <sstream>
+#include <stdexcept>
+
+namespace lcamera_dev {
+
+namespace {
+
+constexpr const char *incompleteOptionalPlanarMessage =
+	"lcameraDev: fullPlanarIsOptional/opt-planar is not honored yet "
+	"(non-planar producer deinterleaving is not implemented)";
+
+} // namespace
+
+void validateCameraModeRequest(const LcameraDevCameraModeRequest& request)
+{
+	if (request.width == 0 || request.height == 0)
+	{
+		throw std::runtime_error(
+			"lcameraDev: camera mode request width and height must be "
+			"non-zero");
+	}
+
+	if (request.colourSpace != LcameraDevColourSpace::Yuv)
+	{
+		throw std::runtime_error(
+			"lcameraDev: unsupported colour-space for camera mode request");
+	}
+}
+
+void rejectFullPlanarOptionalAtConfigureApi(
+	const LcameraDevCameraModeRequest& request)
+{
+	if (request.fullPlanarIsOptional)
+	{
+		throw std::runtime_error(incompleteOptionalPlanarMessage);
+	}
+}
+
+bool cameraModeRequestsEqual(
+	const LcameraDevCameraModeRequest& left,
+	const LcameraDevCameraModeRequest& right)
+{
+	return left.width == right.width
+		&& left.height == right.height
+		&& left.colourSpace == right.colourSpace
+		&& left.fullPlanarIsOptional == right.fullPlanarIsOptional;
+}
+
+} // namespace lcamera_dev