feat: load the user's mpv.conf

src/mpv/mpvitem.h

@@ -29,6 +29,13 @@ class MpvItem : public MpvAbstractItem
     // In seconds; applied to both subtitles so a translation stays in sync with its source.
     Q_PROPERTY(double subtitleDelay READ subtitleDelay WRITE setSubtitleDelay NOTIFY subtitleDelayChanged)
 
+    // Load the user's mpv.conf when mpv starts. Must be set before the item is shown.
+    Q_PROPERTY(bool loadUserConfig READ loadUserConfig WRITE setLoadUserConfig NOTIFY loadUserConfigChanged)
+    Q_PROPERTY(QString userConfigDir READ userConfigDir CONSTANT)
+    // The mpv.conf files that were loaded, and the options in them that were ignored.
+    Q_PROPERTY(QStringList loadedUserConfigFiles READ loadedUserConfigFiles NOTIFY userConfigApplied)
+    Q_PROPERTY(QStringList skippedUserOptions READ skippedUserOptions NOTIFY userConfigApplied)
+
 public:
     explicit MpvItem(QQuickItem *parent = nullptr);
     ~MpvItem() override = default;
@@ -48,6 +55,11 @@ public:
     void setSecondarySubtitleId(int id);
     double subtitleDelay() const;
     void setSubtitleDelay(double seconds);
+    bool loadUserConfig() const;
+    void setLoadUserConfig(bool load);
+    QString userConfigDir() const;
+    QStringList loadedUserConfigFiles() const;
+    QStringList skippedUserOptions() const;
 
     Q_INVOKABLE void loadFile(const QUrl &url);
     Q_INVOKABLE void togglePause();
@@ -69,11 +81,15 @@ Q_SIGNALS:
     void fileLoadedChanged();
     void subtitleTracksChanged();
     void subtitleDelayChanged();
+    void loadUserConfigChanged();
+    // mpv.conf was queued for loading; options set after this take precedence over it.
+    void userConfigApplied();
 
 private:
     void onPropertyChanged(const QString &property, const QVariant &value);
     void setFileLoaded(bool loaded);
     void updateTracks(const QVariantList &trackList);
+    void applyUserConfig();
 
     bool m_ready = false;
     QUrl m_pendingUrl;
@@ -89,4 +105,7 @@ private:
     double m_subtitleDelay = 0.0;
     // File added by showSecondarySubtitleFile() that should become secondary once mpv lists it.
     QString m_pendingSecondaryPath;
+    bool m_loadUserConfig = false;
+    QStringList m_loadedUserConfigFiles;
+    QStringList m_skippedUserOptions;
 };