[Linux] Organize code, implement media controller

linux/mediacontroller.h

@@ -0,0 +1,39 @@
+#ifndef MEDIACONTROLLER_H
+#define MEDIACONTROLLER_H
+
+#include <QDBusInterface>
+#include <QObject>
+
+class QProcess;
+
+class MediaController : public QObject {
+  Q_OBJECT
+public:
+  enum MediaState { Playing, Paused, Stopped };
+
+  explicit MediaController(QObject *parent = nullptr);
+  ~MediaController();
+  
+  void initializeMprisInterface();
+  void handleEarDetection(const QString &status);
+  void followMediaChanges();
+  bool isActiveOutputDeviceAirPods();
+  void handleConversationalAwareness(const QByteArray &data);
+  void activateA2dpProfile();
+  void removeAudioOutputDevice();
+  void setConnectedDeviceMacAddress(const QString &macAddress);
+
+Q_SIGNALS:
+  void mediaStateChanged(MediaState state);
+
+private:
+  MediaState mediaStateFromPlayerctlOutput(const QString &output);
+
+  QDBusInterface *mprisInterface = nullptr;
+  QProcess *playerctlProcess = nullptr;
+  bool wasPausedByApp = false;
+  int initialVolume = -1;
+  QString connectedDeviceMacAddress;
+};
+
+#endif // MEDIACONTROLLER_H