Android: Don't delete the media recorder object twice.

In QAndroidCaptureSession::stop() we call restartViewFinder() which
eventually calls QAndroidCaptureSession::stop() again, but this time
the media recorder object is already released.

Task-number: QTBUG-45637
Change-Id: I943c423398a99d98ccda1063fc16e47cba470deb
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/plugins/android/src/mediacapture/qandroidcapturesession.cpp

@@ -151,23 +151,19 @@ void QAndroidCaptureSession::setState(QMediaRecorder::State state)
         stop();
         break;
     case QMediaRecorder::RecordingState:
-        if (!start())
-            return;
+        start();
         break;
     case QMediaRecorder::PausedState:
         // Not supported by Android API
         qWarning("QMediaRecorder::PausedState is not supported on Android");
-        return;
+        break;
     }
-
-    m_state = state;
-    emit stateChanged(m_state);
 }
 
-bool QAndroidCaptureSession::start()
+void QAndroidCaptureSession::start()
 {
     if (m_state == QMediaRecorder::RecordingState || m_status != QMediaRecorder::LoadedStatus)
-        return false;
+        return;
 
     setStatus(QMediaRecorder::StartingStatus);
 
@@ -225,13 +221,13 @@ bool QAndroidCaptureSession::start()
     if (!m_mediaRecorder->prepare()) {
         emit error(QMediaRecorder::FormatError, QLatin1String("Unable to prepare the media recorder."));
         restartViewfinder();
-        return false;
+        return;
     }
 
     if (!m_mediaRecorder->start()) {
         emit error(QMediaRecorder::FormatError, QLatin1String("Unable to start the media recorder."));
         restartViewfinder();
-        return false;
+        return;
     }
 
     m_elapsedTime.start();
@@ -241,22 +237,21 @@ bool QAndroidCaptureSession::start()
     if (m_cameraSession)
         m_cameraSession->setReadyForCapture(false);
 
-    return true;
+    m_state = QMediaRecorder::RecordingState;
+    emit stateChanged(m_state);
 }
 
 void QAndroidCaptureSession::stop(bool error)
 {
-    if (m_state == QMediaRecorder::StoppedState)
+    if (m_state == QMediaRecorder::StoppedState || m_mediaRecorder == 0)
         return;
 
     setStatus(QMediaRecorder::FinalizingStatus);
 
     m_mediaRecorder->stop();
-
     m_notifyTimer.stop();
     updateDuration();
     m_elapsedTime.invalidate();
-
     m_mediaRecorder->release();
     delete m_mediaRecorder;
     m_mediaRecorder = 0;
@@ -279,6 +274,9 @@ void QAndroidCaptureSession::stop(bool error)
         m_actualOutputLocation = m_usedOutputLocation;
         emit actualLocationChanged(m_actualOutputLocation);
     }
+
+    m_state = QMediaRecorder::StoppedState;
+    emit stateChanged(m_state);
 }
 
 void QAndroidCaptureSession::setStatus(QMediaRecorder::Status status)
@@ -541,8 +539,6 @@ void QAndroidCaptureSession::onError(int what, int extra)
     Q_UNUSED(what)
     Q_UNUSED(extra)
     stop(true);
-    m_state = QMediaRecorder::StoppedState;
-    emit stateChanged(m_state);
     emit error(QMediaRecorder::ResourceError, QLatin1String("Unknown error."));
 }
 

src/plugins/android/src/mediacapture/qandroidcapturesession.h

@@ -130,7 +130,7 @@ private:
 
     CaptureProfile getProfile(int id);
 
-    bool start();
+    void start();
     void stop(bool error = false);
 
     void setStatus(QMediaRecorder::Status status);