Clean up video IO

src/video/core/VideoMode.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <string>
+
+struct FrameSize
+{
+	unsigned width = 0;
+	unsigned height = 0;
+
+	bool IsEmpty() const { return width == 0 || height == 0; }
+};
+
+inline bool operator==(const FrameSize& left, const FrameSize& right)
+{
+	return left.width == right.width && left.height == right.height;
+}
+
+inline bool operator!=(const FrameSize& left, const FrameSize& right)
+{
+	return !(left == right);
+}
+
+struct VideoFormat
+{
+	std::string formatName = "1080p";
+	std::string frameRate = "59.94";
+	std::string displayName = "1080p59.94";
+	FrameSize frameSize = { 1920, 1080 };
+	double frameDurationMilliseconds = 1000.0 / 59.94;
+};
+
+struct VideoFormatSelection
+{
+	VideoFormat input;
+	VideoFormat output;
+};
+
+std::string NormalizeModeToken(const std::string& value);
+double FrameDurationMillisecondsFromRateString(const std::string& rateText, double fallbackRate = 59.94);
+void VideoFormatDimensions(const std::string& formatName, unsigned& width, unsigned& height);
+bool ResolveConfiguredVideoFormat(const std::string& videoFormat, const std::string& frameRate, VideoFormat& videoMode);
+bool ResolveConfiguredVideoFormats(
+	const std::string& inputVideoFormat,
+	const std::string& inputFrameRate,
+	const std::string& outputVideoFormat,
+	const std::string& outputFrameRate,
+	VideoFormatSelection& videoModes,
+	std::string& error);