AudioOutput: fixed core dump on program exit

sdrbase/audio/audiooutput.cpp

@@ -26,6 +26,7 @@ AudioOutput::AudioOutput() :
 	m_mutex(),
 	m_audioOutput(0),
 	m_audioUsageCount(0),
+	m_onExit(false),
 	m_audioFifos()
 {
 }
@@ -124,7 +125,10 @@ void AudioOutput::stop()
         if (m_audioUsageCount == 0)
         {
             QIODevice::close();
-            delete m_audioOutput;
+
+            if (!m_onExit) {
+                delete m_audioOutput;
+            }
         }
     }
 }

sdrbase/audio/audiooutput.h

@@ -41,11 +41,13 @@ public:
 	void removeFifo(AudioFifo* audioFifo);
 
 	uint getRate() const { return m_audioFormat.sampleRate(); }
+	void setOnExit(bool onExit) { m_onExit = onExit; }
 
 private:
 	QMutex m_mutex;
 	QAudioOutput* m_audioOutput;
 	uint m_audioUsageCount;
+	bool m_onExit;
 
 	typedef std::list<AudioFifo*> AudioFifos;
 	AudioFifos m_audioFifos;

sdrbase/dsp/dspengine.cpp

@@ -28,6 +28,8 @@ DSPEngine::DSPEngine() :
 
 DSPEngine::~DSPEngine()
 {
+    m_audioOutput.setOnExit(true);
+
     std::vector<DSPDeviceSourceEngine*>::iterator it = m_deviceEngines.begin();
 
     while (it != m_deviceEngines.end())