Partially decouple Mixer from VisualizationWidget

include/Mixer.h

@@ -231,11 +231,6 @@ public:
 		return m_framesPerPeriod;
 	}
 
-	inline const surroundSampleFrame * currentReadBuffer() const
-	{
-		return m_readBuf;
-	}
-
 
 	MixerProfiler& profiler()
 	{
@@ -362,7 +357,7 @@ public:
 signals:
 	void qualitySettingsChanged();
 	void sampleRateChanged();
-	void nextAudioBuffer();
+	void nextAudioBuffer( const surroundSampleFrame * buffer );
 
 
 private:

include/VisualizationWidget.h

@@ -54,7 +54,7 @@ protected:
 
 
 protected slots:
-	void updateAudioBuffer();
+	void updateAudioBuffer( const surroundSampleFrame * buffer );
 
 
 private:

src/core/Mixer.cpp

@@ -447,7 +447,7 @@ const surroundSampleFrame * Mixer::renderNextBuffer()
 	unlock();
 
 
-	emit nextAudioBuffer();
+	emit nextAudioBuffer( m_readBuf );
 
 	// and trigger LFOs
 	EnvelopeAndLfoParameters::instances()->trigger();

src/gui/widgets/VisualizationWidget.cpp

@@ -72,14 +72,12 @@ VisualizationWidget::~VisualizationWidget()
 
 
 
-void VisualizationWidget::updateAudioBuffer()
+void VisualizationWidget::updateAudioBuffer( const surroundSampleFrame * buffer )
 {
 	if( !Engine::getSong()->isExporting() )
 	{
-		const surroundSampleFrame * c = Engine::mixer()->
-							currentReadBuffer();
 		const fpp_t fpp = Engine::mixer()->framesPerPeriod();
-		memcpy( m_buffer, c, sizeof( surroundSampleFrame ) * fpp );
+		memcpy( m_buffer, buffer, sizeof( surroundSampleFrame ) * fpp );
 	}
 }
 
@@ -95,8 +93,8 @@ void VisualizationWidget::setActive( bool _active )
 					SIGNAL( periodicUpdate() ),
 					this, SLOT( update() ) );
 		connect( Engine::mixer(),
-					SIGNAL( nextAudioBuffer() ),
-				this, SLOT( updateAudioBuffer() ) );
+			SIGNAL( nextAudioBuffer( const surroundSampleFrame* ) ),
+			this, SLOT( updateAudioBuffer( const surroundSampleFrame* ) ) );
 	}
 	else
 	{
@@ -104,8 +102,8 @@ void VisualizationWidget::setActive( bool _active )
 					SIGNAL( periodicUpdate() ),
 					this, SLOT( update() ) );
 		disconnect( Engine::mixer(),
-					SIGNAL( nextAudioBuffer() ),
-				this, SLOT( updateAudioBuffer() ) );
+			SIGNAL( nextAudioBuffer( const surroundSampleFrame* ) ),
+			this, SLOT( updateAudioBuffer( const surroundSampleFrame* ) ) );
 		// we have to update (remove last waves),
 		// because timer doesn't do that anymore
 		update();