[Linux] Use DBus for following media playback change

linux/CMakeLists.txt

@@ -12,8 +12,8 @@ qt_standard_project_setup(REQUIRES 6.4)
 qt_add_executable(applinux
     main.cpp
     logger.h
-    mediacontroller.cpp
-    mediacontroller.h
+    media/mediacontroller.cpp
+    media/mediacontroller.h
     airpods_packets.h
     trayiconmanager.cpp
     trayiconmanager.h
@@ -32,6 +32,8 @@ qt_add_executable(applinux
     thirdparty/QR-Code-generator/qrcodegen.hpp
     QRCodeImageProvider.hpp
     eardetection.hpp
+    media/playerstatuswatcher.cpp
+    media/playerstatuswatcher.h
 )
 
 qt_add_qml_module(applinux

linux/main.cpp

@@ -14,7 +14,7 @@
 
 #include "airpods_packets.h"
 #include "logger.h"
-#include "mediacontroller.h"
+#include "media/mediacontroller.h"
 #include "trayiconmanager.h"
 #include "enums.h"
 #include "battery.hpp"
@@ -66,7 +66,6 @@ public:
         // Initialize MediaController and connect signals
         mediaController = new MediaController(this);
         connect(mediaController, &MediaController::mediaStateChanged, this, &AirPodsTrayApp::handleMediaStateChange);
-        mediaController->initializeMprisInterface();
         mediaController->followMediaChanges();
 
         monitor = new BluetoothMonitor(this);
@@ -795,13 +794,6 @@ public:
             process.waitForFinished();
             QString output = process.readAllStandardOutput().trimmed();
             LOG_INFO("Bluetoothctl output: " << output);
-            if (output.contains("Connection successful")) {
-                LOG_INFO("Connection successful, proceeding with L2CAP connection");
-                QBluetoothAddress btAddress(m_deviceInfo->bluetoothAddress());
-                forceL2capConnection(btAddress);
-            } else {
-                LOG_ERROR("Connection failed, cannot proceed with L2CAP connection");
-            }
         }
         QBluetoothLocalDevice localDevice;
         const QList<QBluetoothAddress> connectedDevices = localDevice.connectedDevices();
@@ -816,31 +808,6 @@ public:
         LOG_WARN("AirPods not found among connected devices");
     }
 
-    void forceL2capConnection(const QBluetoothAddress &address) {
-        LOG_INFO("Retrying L2CAP connection for up to 10 seconds...");
-        QBluetoothDeviceInfo device(address, "", 0);
-        QElapsedTimer timer;
-        timer.start();
-        while (timer.elapsed() < 10000) {
-            QProcess bcProcess;
-            bcProcess.start("bluetoothctl", QStringList() << "connect" << address.toString());
-            bcProcess.waitForFinished();
-            QString output = bcProcess.readAllStandardOutput().trimmed();
-            LOG_INFO("Bluetoothctl output: " << output);
-            if (output.contains("Connection successful")) {
-                connectToDevice(device);
-                QThread::sleep(1);
-                if (socket && socket->isOpen()) {
-                    LOG_INFO("Successfully connected to device: " << address.toString());
-                    return;
-                }
-            } else {
-                LOG_WARN("Connection attempt failed, retrying...");
-            }
-        }
-        LOG_ERROR("Failed to connect to device within 10 seconds: " << address.toString());
-    }
-
     void initializeBluetooth() {
         connectToPhone();
 

linux/media/mediacontroller.cpp

@@ -1,6 +1,7 @@
 #include "mediacontroller.h"
 #include "logger.h"
 #include "eardetection.hpp"
+#include "playerstatuswatcher.h"
 
 #include <QDebug>
 #include <QProcess>
@@ -9,34 +10,6 @@
 #include <QDBusConnectionInterface>
 
 MediaController::MediaController(QObject *parent) : QObject(parent) {
-  // No additional initialization required here
-}
-
-void MediaController::initializeMprisInterface() {
-  QStringList services =
-      QDBusConnection::sessionBus().interface()->registeredServiceNames();
-  QString mprisService;
-
-  for (const QString &service : services) {
-    if (service.startsWith("org.mpris.MediaPlayer2.") &&
-        service != "org.mpris.MediaPlayer2") {
-      mprisService = service;
-      break;
-    }
-  }
-
-  if (!mprisService.isEmpty()) {
-    mprisInterface = new QDBusInterface(mprisService, "/org/mpris/MediaPlayer2",
-                                        "org.mpris.MediaPlayer2.Player",
-                                        QDBusConnection::sessionBus(), this);
-    if (!mprisInterface->isValid()) {
-      LOG_ERROR("Failed to initialize MPRIS interface for service: ") << mprisService;
-    } else {
-      LOG_INFO("Connected to MPRIS service: " << mprisService);
-    }
-  } else {
-    LOG_WARN("No active MPRIS media players found");
-  }
 }
 
 void MediaController::handleEarDetection(EarDetection *earDetection)
@@ -118,16 +91,14 @@ void MediaController::setEarDetectionBehavior(EarDetectionBehavior behavior)
 }
 
 void MediaController::followMediaChanges() {
-  playerctlProcess = new QProcess(this);
-  connect(playerctlProcess, &QProcess::readyReadStandardOutput, this,
-          [this]() {
-            QString output =
-                playerctlProcess->readAllStandardOutput().trimmed();
-            LOG_DEBUG("Playerctl output: " << output);
-            MediaState state = mediaStateFromPlayerctlOutput(output);
+  playerStatusWatcher = new PlayerStatusWatcher("", this);
+  connect(playerStatusWatcher, &PlayerStatusWatcher::playbackStatusChanged,
+          this, [this](const QString &status)
+          {
+            LOG_DEBUG("Playback status changed: " << status);
+            MediaState state = mediaStateFromPlayerctlOutput(status);
             emit mediaStateChanged(state);
           });
-  playerctlProcess->start("playerctl", QStringList() << "--follow" << "status");
 }
 
 bool MediaController::isActiveOutputDeviceAirPods() {
@@ -241,13 +212,6 @@ void MediaController::pause() {
 }
 
 MediaController::~MediaController() {
-  if (playerctlProcess) {
-    playerctlProcess->terminate();
-    if (!playerctlProcess->waitForFinished()) {
-      playerctlProcess->kill();
-      playerctlProcess->waitForFinished(1000);
-    }
-  }
 }
 
 QString MediaController::getAudioDeviceName()

linux/media/mediacontroller.h

@@ -6,6 +6,7 @@
 
 class QProcess;
 class EarDetection;
+class PlayerStatusWatcher;
 
 class MediaController : public QObject
 {
@@ -29,7 +30,6 @@ public:
   explicit MediaController(QObject *parent = nullptr);
   ~MediaController();
 
-  void initializeMprisInterface();
   void handleEarDetection(EarDetection*);
   void followMediaChanges();
   bool isActiveOutputDeviceAirPods();
@@ -50,13 +50,12 @@ private:
   MediaState mediaStateFromPlayerctlOutput(const QString &output);
   QString getAudioDeviceName();
 
-  QDBusInterface *mprisInterface = nullptr;
-  QProcess *playerctlProcess = nullptr;
   bool wasPausedByApp = false;
   int initialVolume = -1;
   QString connectedDeviceMacAddress;
   EarDetectionBehavior earDetectionBehavior = PauseWhenOneRemoved;
   QString m_deviceOutputName;
+  PlayerStatusWatcher *playerStatusWatcher = nullptr;
 };
 
 #endif // MEDIACONTROLLER_H

linux/media/playerstatuswatcher.cpp

@@ -0,0 +1,47 @@
+#include "playerstatuswatcher.h"
+#include <QDBusConnection>
+#include <QDBusPendingReply>
+#include <QVariantMap>
+#include <QDBusReply>
+
+PlayerStatusWatcher::PlayerStatusWatcher(const QString &playerService, QObject *parent)
+    : QObject(parent),
+      m_playerService(playerService),
+      m_iface(new QDBusInterface(playerService, "/org/mpris/MediaPlayer2",
+                                 "org.mpris.MediaPlayer2.Player", QDBusConnection::sessionBus(), this)),
+      m_serviceWatcher(new QDBusServiceWatcher(playerService, QDBusConnection::sessionBus(),
+                                               QDBusServiceWatcher::WatchForOwnerChange, this))
+{
+    QDBusConnection::sessionBus().connect(
+        playerService, "/org/mpris/MediaPlayer2", "org.freedesktop.DBus.Properties",
+        "PropertiesChanged", this, SLOT(onPropertiesChanged(QString,QVariantMap,QStringList))
+    );
+    connect(m_serviceWatcher, &QDBusServiceWatcher::serviceOwnerChanged,
+            this, &PlayerStatusWatcher::onServiceOwnerChanged);
+    updateStatus();
+}
+
+void PlayerStatusWatcher::onPropertiesChanged(const QString &interface,
+                                              const QVariantMap &changed,
+                                              const QStringList &)
+{
+    if (interface == "org.mpris.MediaPlayer2.Player" && changed.contains("PlaybackStatus")) {
+        emit playbackStatusChanged(changed.value("PlaybackStatus").toString());
+    }
+}
+
+void PlayerStatusWatcher::updateStatus() {
+    QVariant reply = m_iface->property("PlaybackStatus");
+    if (reply.isValid()) {
+        emit playbackStatusChanged(reply.toString());
+    }
+}
+
+void PlayerStatusWatcher::onServiceOwnerChanged(const QString &name, const QString &, const QString &newOwner)
+{
+    if (name == m_playerService && newOwner.isEmpty()) {
+        emit playbackStatusChanged(""); // player disappeared
+    } else if (name == m_playerService && !newOwner.isEmpty()) {
+        updateStatus(); // player appeared/reappeared
+    }
+}

linux/media/playerstatuswatcher.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <QObject>
+#include <QDBusInterface>
+#include <QDBusServiceWatcher>
+
+class PlayerStatusWatcher : public QObject {
+    Q_OBJECT
+public:
+    explicit PlayerStatusWatcher(const QString &playerService, QObject *parent = nullptr);
+
+signals:
+    void playbackStatusChanged(const QString &status);
+
+private slots:
+    void onPropertiesChanged(const QString &interface, const QVariantMap &changed, const QStringList &);
+    void onServiceOwnerChanged(const QString &name, const QString &oldOwner, const QString &newOwner);
+
+private:
+    void updateStatus();
+    QString m_playerService;
+    QDBusInterface *m_iface;
+    QDBusServiceWatcher *m_serviceWatcher;
+};