citra_qt/dumping: Add dumping dialog

This is the main dialog of video dumping. This dialog allows the user to set output format, output path, video/audio encoder and video/audio bitrate.

When a format is selected, the list of video and audio encoders are updated. Only encoders of codecs that can be contained in the format is shown.

src/citra_qt/dumping/dumping_dialog.h

@@ -0,0 +1,41 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <memory>
+#include <QDialog>
+#include "core/dumping/ffmpeg_backend.h"
+
+namespace Ui {
+class DumpingDialog;
+}
+
+class DumpingDialog : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit DumpingDialog(QWidget* parent);
+    ~DumpingDialog() override;
+
+    QString GetFilePath() const;
+    void ApplyConfiguration();
+
+private:
+    void Populate();
+    void PopulateEncoders();
+    void SetConfiguration();
+    void OnToolButtonClicked();
+    void OpenOptionsDialog(const std::vector<VideoDumper::OptionInfo>& options,
+                           std::string& current_value);
+
+    std::unique_ptr<Ui::DumpingDialog> ui;
+    std::string format_options;
+    std::string video_encoder_options;
+    std::string audio_encoder_options;
+
+    QString last_path;
+
+    std::vector<VideoDumper::FormatInfo> formats;
+    std::vector<VideoDumper::EncoderInfo> video_encoders;
+    std::vector<VideoDumper::EncoderInfo> audio_encoders;
+};