Fixed freeze when finishing export

Fixed stopping processing

include/AudioAlsa.h

@@ -33,6 +33,7 @@
 #define ALSA_PCM_NEW_HW_PARAMS_API
 
 #include <alsa/asoundlib.h>
+#include <QThread>
 
 #include "AudioDevice.h"
 

include/AudioDevice.h

@@ -25,17 +25,15 @@
 #ifndef AUDIO_DEVICE_H
 #define AUDIO_DEVICE_H
 
-#include <QtCore/QPair>
 #include <QtCore/QMutex>
-#include <QtCore/QThread>
 #include <samplerate.h>
 
 #include "lmms_basics.h"
-#include "TabWidget.h"
 
 
 class AudioPort;
 class Mixer;
+class QThread;
 
 
 class AudioDevice
@@ -135,6 +133,8 @@ protected:
 
 	bool hqAudio() const;
 
+	static void stopProcessingThread( QThread * thread );
+
 
 protected:
 	bool m_supportsCapture;

include/AudioDummy.h

@@ -84,11 +84,7 @@ private:
 
 	virtual void stopProcessing()
 	{
-		if( isRunning() )
-		{
-			wait( 1000 );
-			terminate();
-		}
+		stopProcessingThread( this );
 	}
 
 	virtual void run()

include/AudioOss.h

@@ -29,6 +29,8 @@
 
 #ifdef LMMS_HAVE_OSS
 
+#include <QThread>
+
 #include "AudioDevice.h"
 #include "AudioDeviceSetupWidget.h"
 

include/AudioPulseAudio.h

@@ -30,6 +30,7 @@
 #ifdef LMMS_HAVE_PULSEAUDIO
 
 #include <pulse/pulseaudio.h>
+#include <QThread>
 
 #include "AudioDevice.h"
 #include "AudioDeviceSetupWidget.h"

include/AudioSndio.h

@@ -5,6 +5,7 @@
 
 #ifdef LMMS_HAVE_SNDIO
 
+#include <QThread>
 #include <sndio.h>
 
 #include "AudioDevice.h"

include/Mixer.h

@@ -331,6 +331,8 @@ private:
 
 		virtual void run();
 
+		void write( surroundSampleFrame * buffer );
+
 	} ;
 
 
@@ -347,6 +349,7 @@ private:
 
 	const surroundSampleFrame * renderNextBuffer();
 
+	void clearInternal();
 
 	void runChangesInModel();
 
@@ -403,6 +406,8 @@ private:
 
 	bool m_metronomeActive;
 
+	bool m_clearSignal;
+
 	bool m_changesSignal;
 	bool m_waitForMixer;
 	unsigned int m_changes;

include/fifo_buffer.h

@@ -57,6 +57,18 @@ public:
 		m_reader_sem.release();
 	}
 
+	bool tryWrite( T _element )
+	{
+		if( m_writer_sem.tryAcquire() )
+		{
+			m_buffer[m_writer_index++] = _element;
+			m_writer_index %= m_size;
+			m_reader_sem.release();
+			return true;
+		}
+		return false;
+	}
+
 	T read()
 	{
 		m_reader_sem.acquire();