Add video tab (#131)

This tab will allow switching scenes based on the video output of sources.

src/headers/switch-video.hpp

@@ -0,0 +1,98 @@
+#pragma once
+#include <QSpinBox>
+
+#include "switch-generic.hpp"
+
+constexpr auto video_func = 9;
+constexpr auto default_priority_9 = video_func;
+
+enum class videoSwitchType {
+	MATCH,
+	DIFFER,
+	HAS_NOT_CHANGED,
+};
+
+class AdvSSScreenshotObj {
+public:
+	AdvSSScreenshotObj(obs_source_t *source);
+	~AdvSSScreenshotObj();
+
+	void Screenshot();
+	void Download();
+	void Copy();
+	void MarkDone();
+
+	gs_texrender_t *texrender = nullptr;
+	gs_stagesurf_t *stagesurf = nullptr;
+	OBSWeakSource weakSource;
+	std::string path;
+	QImage image;
+	uint32_t cx = 0;
+	uint32_t cy = 0;
+
+	int stage = 0;
+
+	bool done = false;
+	std::chrono::high_resolution_clock::time_point time;
+};
+
+struct VideoSwitch : virtual SceneSwitcherEntry {
+	static bool pause;
+
+	videoSwitchType condition = videoSwitchType::MATCH;
+	OBSWeakSource videoSource = nullptr;
+	std::string file = obs_module_text("AdvSceneSwitcher.enterPath");
+	double duration = 0;
+	bool ignoreInactiveSource = false;
+
+	std::unique_ptr<AdvSSScreenshotObj> screenshotData = nullptr;
+	std::chrono::high_resolution_clock::time_point previousTime{};
+	QImage matchImage;
+
+	std::chrono::milliseconds currentMatchDuration{};
+
+	const char *getType() { return "video"; }
+	bool initialized();
+	bool valid();
+	void save(obs_data_t *obj);
+	void load(obs_data_t *obj);
+	void getScreenshot();
+	bool loadImageFromFile();
+	bool checkMatch();
+
+	VideoSwitch(){};
+	friend void swap(VideoSwitch &first, VideoSwitch &second);
+};
+
+class VideoSwitchWidget : public SwitchWidget {
+	Q_OBJECT
+
+public:
+	VideoSwitchWidget(QWidget *parent, VideoSwitch *s);
+	VideoSwitch *getSwitchData();
+	void setSwitchData(VideoSwitch *s);
+
+	static void swapSwitchData(VideoSwitchWidget *as1,
+				   VideoSwitchWidget *as2);
+
+	void UpdatePreviewTooltip();
+	void SetFilePath(const QString &text);
+
+private slots:
+	void SourceChanged(const QString &text);
+	void ConditionChanged(int cond);
+	void DurationChanged(double dur);
+	void FilePathChanged();
+	void BrowseButtonClicked();
+	void IgnoreInactiveChanged(int state);
+
+private:
+	QComboBox *videoSources;
+	QComboBox *condition;
+	QDoubleSpinBox *duration;
+	QLineEdit *filePath;
+	QPushButton *browseButton;
+	QCheckBox *ignoreInactiveSource;
+
+	VideoSwitch *switchData;
+};