Video backend

tests/VideoIOBackendFactoryTests.cpp

@@ -0,0 +1,41 @@
+#include "VideoIOBackendFactory.h"
+#include "VideoIOTypes.h"
+
+#include <iostream>
+
+namespace
+{
+int gFailures = 0;
+
+void Expect(bool condition, const char* message)
+{
+	if (condition)
+		return;
+
+	std::cerr << "FAIL: " << message << "\n";
+	++gFailures;
+}
+}
+
+int main()
+{
+	std::string error;
+	std::unique_ptr<VideoIODevice> device = CreateVideoIODevice(VideoIOBackendId::DeckLink, error);
+	Expect(device != nullptr, "decklink backend factory returns a device");
+	Expect(!device || device->BackendId() == VideoIOBackendId::DeckLink, "decklink backend reports decklink id");
+	Expect(error.empty(), "supported backend does not produce an error");
+
+	error.clear();
+	device = CreateVideoIODevice(static_cast<VideoIOBackendId>(999), error);
+	Expect(device == nullptr, "unknown backend id is rejected");
+	Expect(!error.empty(), "unknown backend reports an error");
+
+	if (gFailures != 0)
+	{
+		std::cerr << gFailures << " VideoIO backend factory test failure(s).\n";
+		return 1;
+	}
+
+	std::cout << "VideoIO backend factory tests passed.\n";
+	return 0;
+}