Video backend

apps/LoopThroughWithOpenGLCompositing/videoio/VideoIOConfig.cpp

@@ -0,0 +1,35 @@
+#include "VideoIOConfig.h"
+
+#include <algorithm>
+#include <cctype>
+
+namespace
+{
+std::string NormalizeToken(std::string value)
+{
+	std::transform(value.begin(), value.end(), value.begin(),
+		[](unsigned char ch) { return static_cast<char>(std::tolower(ch)); });
+	return value;
+}
+}
+
+const char* VideoIOBackendName(VideoIOBackendId backendId)
+{
+	switch (backendId)
+	{
+	case VideoIOBackendId::DeckLink:
+		return "decklink";
+	}
+	return "unknown";
+}
+
+bool ParseVideoIOBackendId(const std::string& value, VideoIOBackendId& backendId)
+{
+	const std::string normalized = NormalizeToken(value);
+	if (normalized.empty() || normalized == "decklink")
+	{
+		backendId = VideoIOBackendId::DeckLink;
+		return true;
+	}
+	return false;
+}