Improved metronome (on/off during song, pattern and bb playback)

There is a new tool button that can be used to turn the metronome on and
off. Per default the metronome is turned off. When enabled the metronome
will during on song playback, pattern playback and BB playback. During
export it is ignored.

A new icon was added as well.

The state is currently stored in the Mixer. It might make sense to put
the metronome configuration in its own class in the future. The state is
currently not stored in the file but this might be a good choice for now
until a better place is found for the metronome data.

Also removed some repeated calls to Engine::getSong() and
Engine::fxMixer().

src/core/Mixer.cpp

@@ -73,7 +73,8 @@ Mixer::Mixer( bool renderOnly ) :
 	m_audioDev( NULL ),
 	m_oldAudioDev( NULL ),
 	m_globalMutex( QMutex::Recursive ),
-	m_profiler()
+	m_profiler(),
+	m_metronomeActive(false)
 {
 	for( int i = 0; i < 2; ++i )
 	{
@@ -318,18 +319,25 @@ const surroundSampleFrame * Mixer::renderNextBuffer()
 
 	static Song::PlayPos last_metro_pos = -1;
 
-	Song::PlayPos p = Engine::getSong()->getPlayPos(
-						Song::Mode_PlayPattern );
-	if( Engine::getSong()->playMode() == Song::Mode_PlayPattern &&
-		gui->pianoRoll()->isRecording() == true &&
+	Song *song = Engine::getSong();
+
+	Song::PlayModes currentPlayMode = song->playMode();
+	Song::PlayPos p = song->getPlayPos( currentPlayMode );
+
+	bool playModeSupportsMetronome = currentPlayMode == Song::Mode_PlayPattern ||
+					 currentPlayMode == Song::Mode_PlaySong ||
+					 currentPlayMode == Song::Mode_PlayBB;
+
+	if( playModeSupportsMetronome && m_metronomeActive && !song->isExporting() &&
 		p != last_metro_pos )
 	{
-		if ( p.getTicks() % (MidiTime::ticksPerTact() / 1 ) == 0 )
+		tick_t ticksPerTact = MidiTime::ticksPerTact();
+		if ( p.getTicks() % (ticksPerTact / 1 ) == 0 )
 		{
 			addPlayHandle( new SamplePlayHandle( "misc/metronome02.ogg" ) );
 		}
-		else if ( p.getTicks() % (MidiTime::ticksPerTact() /
-			Engine::getSong()->getTimeSigModel().getNumerator() ) == 0 )
+		else if ( p.getTicks() % (ticksPerTact /
+			song->getTimeSigModel().getNumerator() ) == 0 )
 		{
 			addPlayHandle( new SamplePlayHandle( "misc/metronome01.ogg" ) );
 		}
@@ -337,9 +345,11 @@ const surroundSampleFrame * Mixer::renderNextBuffer()
 	}
 
 	lockInputFrames();
+
 	// swap buffer
 	m_inputBufferWrite = ( m_inputBufferWrite + 1 ) % 2;
 	m_inputBufferRead =  ( m_inputBufferRead + 1 ) % 2;
+
 	// clear new write buffer
 	m_inputBufferFrames[ m_inputBufferWrite ] = 0;
 	unlockInputFrames();
@@ -383,10 +393,11 @@ const surroundSampleFrame * Mixer::renderNextBuffer()
 	clearAudioBuffer( m_writeBuf, m_framesPerPeriod );
 
 	// prepare master mix (clear internal buffers etc.)
-	Engine::fxMixer()->prepareMasterMix();
+	FxMixer * fxMixer = Engine::fxMixer();
+	fxMixer->prepareMasterMix();
 
 	// create play-handles for new notes, samples etc.
-	Engine::getSong()->processNextBuffer();
+	song->processNextBuffer();
 
 	// add all play-handles that have to be added
 	m_playHandleMutex.lock();
@@ -432,7 +443,7 @@ const surroundSampleFrame * Mixer::renderNextBuffer()
 
 
 	// STAGE 3: do master mix in FX mixer
-	Engine::fxMixer()->masterMix( m_writeBuf );
+	fxMixer->masterMix( m_writeBuf );
 
 	unlock();
 

src/gui/MainWindow.cpp

@@ -78,7 +78,8 @@ MainWindow::MainWindow() :
 	m_recentlyOpenedProjectsMenu( NULL ),
 	m_toolsMenu( NULL ),
 	m_autoSaveTimer( this ),
-	m_viewMenu( NULL )
+	m_viewMenu( NULL ),
+	m_metronomeToggle( 0 )
 {
 	setAttribute( Qt::WA_DeleteOnClose );
 
@@ -430,6 +431,13 @@ void MainWindow::finalize()
 					this, SLOT( enterWhatsThisMode() ),
 								m_toolBar );
 
+	m_metronomeToggle = new ToolButton(
+				embed::getIconPixmap( "metronome" ),
+				tr( "Toggle metronome" ),
+				this, SLOT( onToggleMetronome() ),
+							m_toolBar );
+	m_metronomeToggle->setCheckable(true);
+	m_metronomeToggle->setChecked(Engine::mixer()->isMetronomeActive());
 
 	m_toolBarLayout->setColumnMinimumWidth( 0, 5 );
 	m_toolBarLayout->addWidget( project_new, 0, 1 );
@@ -439,6 +447,7 @@ void MainWindow::finalize()
 	m_toolBarLayout->addWidget( project_save, 0, 5 );
 	m_toolBarLayout->addWidget( project_export, 0, 6 );
 	m_toolBarLayout->addWidget( whatsthis, 0, 7 );
+	m_toolBarLayout->addWidget( m_metronomeToggle, 0, 8 );
 
 
 	// window-toolbar
@@ -1209,6 +1218,17 @@ void MainWindow::updateConfig( QAction * _who )
 }
 
 
+
+void MainWindow::onToggleMetronome()
+{
+	Mixer * mixer = Engine::mixer();
+
+	mixer->setMetronomeActive( m_metronomeToggle->isChecked() );
+}
+
+
+
+
 void MainWindow::toggleControllerRack()
 {
 	toggleWindow( gui->getControllerRackView() );

src/gui/editors/SongEditor.cpp

@@ -111,7 +111,7 @@ SongEditor::SongEditor( Song * _song ) :
 	// add some essential widgets to global tool-bar
 	QWidget * tb = gui->mainWindow()->toolBar();
 
-	gui->mainWindow()->addSpacingToToolBar( 10 );
+	gui->mainWindow()->addSpacingToToolBar( 40 );
 
 	m_tempoSpinBox = new LcdSpinBox( 3, tb, tr( "Tempo" ) );
 	m_tempoSpinBox->setModel( &m_song->m_tempoModel );