[Linux] Use DBus for following media playback change

linux/media/mediacontroller.h

@@ -0,0 +1,61 @@
+#ifndef MEDIACONTROLLER_H
+#define MEDIACONTROLLER_H
+
+#include <QDBusInterface>
+#include <QObject>
+
+class QProcess;
+class EarDetection;
+class PlayerStatusWatcher;
+
+class MediaController : public QObject
+{
+  Q_OBJECT
+public:
+  enum MediaState
+  {
+    Playing,
+    Paused,
+    Stopped
+  };
+  Q_ENUM(MediaState)
+  enum EarDetectionBehavior
+  {
+    PauseWhenOneRemoved,
+    PauseWhenBothRemoved,
+    Disabled
+  };
+  Q_ENUM(EarDetectionBehavior)
+
+  explicit MediaController(QObject *parent = nullptr);
+  ~MediaController();
+
+  void handleEarDetection(EarDetection*);
+  void followMediaChanges();
+  bool isActiveOutputDeviceAirPods();
+  void handleConversationalAwareness(const QByteArray &data);
+  void activateA2dpProfile();
+  void removeAudioOutputDevice();
+  void setConnectedDeviceMacAddress(const QString &macAddress);
+
+  void setEarDetectionBehavior(EarDetectionBehavior behavior);
+  inline EarDetectionBehavior getEarDetectionBehavior() const { return earDetectionBehavior; }
+
+  void pause();
+
+Q_SIGNALS:
+  void mediaStateChanged(MediaState state);
+
+private:
+  MediaState mediaStateFromPlayerctlOutput(const QString &output);
+  QString getAudioDeviceName();
+
+  bool wasPausedByApp = false;
+  int initialVolume = -1;
+  QString connectedDeviceMacAddress;
+  EarDetectionBehavior earDetectionBehavior = PauseWhenOneRemoved;
+  QString m_deviceOutputName;
+  PlayerStatusWatcher *playerStatusWatcher = nullptr;
+};
+
+#endif // MEDIACONTROLLER_H