Fix kVstTransportChanged flag usage in VST sync

Changed according to feedback from AudioBlast. The flag used to be set most of the time, now it is only set when playback starts/stops, looping is toggled, or playback jumps around.

Author: DomClark

include/Song.h

@@ -87,10 +87,19 @@ class EXPORT Song : public TrackContainer
 		{
 			return m_currentFrame;
 		}
+		inline void setJumped( const bool jumped )
+		{
+			m_jumped = jumped;
+		}
+		inline bool jumped() const
+		{
+			return m_jumped;
+		}
 		TimeLineWidget * m_timeLine;
 
 	private:
 		float m_currentFrame;
+		bool m_jumped;
 
 	} ;
 

include/VstSyncController.h

@@ -61,6 +61,11 @@ class VstSyncController : public QObject
 		m_syncData->isCycle = false;
 	}
 
+	void setPlaybackJumped( bool jumped )
+	{
+		m_syncData->m_playbackJumped = jumped;
+	}
+
 	void update();
 
 
@@ -79,6 +84,7 @@ private slots:
 		bool hasSHM;
 		float cycleStart;
 		float cycleEnd;
+		bool m_playbackJumped;
 		int m_bufferSize;
 		int m_sampleRate;
 		int m_bpm;

include/VstSyncData.h

@@ -49,6 +49,7 @@ struct VstSyncData
 	bool hasSHM;
 	float cycleStart;
 	float cycleEnd;
+	bool m_playbackJumped;
 	int m_bufferSize;
 	int m_sampleRate;
 	int m_bpm;

plugins/vst_base/RemoteVstPlugin.cpp

@@ -396,6 +396,7 @@ class RemoteVstPlugin : public RemotePluginClient
 	{
 		float lastppqPos;
 		float m_Timestamp;
+		int32_t m_lastFlags;
 	} ;
 
 	in * m_in;
@@ -478,12 +479,14 @@ RemoteVstPlugin::RemoteVstPlugin( const char * socketPath ) :
 		m_vstSyncData->ppqPos = 0;
 		m_vstSyncData->isCycle = false;
 		m_vstSyncData->hasSHM = false;
+		m_vstSyncData->m_playbackJumped = false;
 		m_vstSyncData->m_sampleRate = sampleRate();
 	}
 
 	m_in = ( in* ) new char[ sizeof( in ) ];
 	m_in->lastppqPos = 0;
 	m_in->m_Timestamp = -1;
+	m_in->m_lastFlags = 0;
 
 	// process until we have loaded the plugin
 	while( 1 )
@@ -1588,7 +1591,6 @@ intptr_t RemoteVstPlugin::hostCallback( AEffect * _effect, int32_t _opcode,
 							__plugin->m_in->m_Timestamp )
 			{
 				_timeInfo.ppqPos = __plugin->m_vstSyncData->ppqPos;
-				_timeInfo.flags |= kVstTransportChanged;
 				__plugin->m_in->lastppqPos = __plugin->m_vstSyncData->ppqPos;
 				__plugin->m_in->m_Timestamp = __plugin->m_vstSyncData->ppqPos;
 			}
@@ -1615,6 +1617,14 @@ intptr_t RemoteVstPlugin::hostCallback( AEffect * _effect, int32_t _opcode,
 
 			_timeInfo.flags |= kVstBarsValid;
 
+			if( ( _timeInfo.flags & ( kVstTransportPlaying | kVstTransportCycleActive ) ) !=
+				( __plugin->m_in->m_lastFlags & ( kVstTransportPlaying | kVstTransportCycleActive ) )
+				|| __plugin->m_vstSyncData->m_playbackJumped )
+			{
+				_timeInfo.flags |= kVstTransportChanged;
+			}
+			__plugin->m_in->m_lastFlags = _timeInfo.flags;
+
 #ifdef LMMS_BUILD_WIN64
 			return (long long) &_timeInfo;
 #else

src/core/Song.cpp

@@ -193,6 +193,8 @@ void Song::savePos()
 
 void Song::processNextBuffer()
 {
+	m_vstSyncController.setPlaybackJumped( false );
+
 	// if not playing, nothing to do
 	if( m_playing == false )
 	{
@@ -262,10 +264,21 @@ void Song::processNextBuffer()
 				( tl->loopBegin().getTicks() * 60 * 1000 / 48 ) / getTempo();
 			m_playPos[m_playMode].setTicks(
 						tl->loopBegin().getTicks() );
+
+			m_vstSyncController.setAbsolutePosition(
+						tl->loopBegin().getTicks() );
+			m_vstSyncController.setPlaybackJumped( true );
+
 			emit updateSampleTracks();
 		}
 	}
 
+	if( m_playPos[m_playMode].jumped() )
+	{
+		m_vstSyncController.setPlaybackJumped( true );
+		m_playPos[m_playMode].setJumped( false );
+	}
+
 	f_cnt_t framesPlayed = 0;
 	const float framesPerTick = Engine::framesPerTick();
 
@@ -320,6 +333,7 @@ void Song::processNextBuffer()
 						( ticks * 60 * 1000 / 48 ) / getTempo();
 
 					m_vstSyncController.setAbsolutePosition( ticks );
+					m_vstSyncController.setPlaybackJumped( true );
 				}
 			}
 			m_playPos[m_playMode].setTicks( ticks );
@@ -334,11 +348,14 @@ void Song::processNextBuffer()
 				// beginning of the range
 				if( m_playPos[m_playMode] >= tl->loopEnd() )
 				{
-					m_playPos[m_playMode].setTicks( tl->loopBegin().getTicks() );
+					ticks = tl->loopBegin().getTicks();
+					m_playPos[m_playMode].setTicks( ticks );
 
 					m_elapsedMilliSeconds =
-						( ( tl->loopBegin().getTicks() ) * 60 * 1000 / 48 ) /
-							getTempo();
+						( ticks * 60 * 1000 / 48 ) / getTempo();
+
+					m_vstSyncController.setAbsolutePosition( ticks );
+					m_vstSyncController.setPlaybackJumped( true );
 				}
 				else if( m_playPos[m_playMode] == tl->loopEnd() - 1 )
 				{
@@ -609,6 +626,7 @@ void Song::setPlayPos( tick_t ticks, PlayModes playMode )
 			getTempo() );
 	m_playPos[playMode].setTicks( ticks );
 	m_playPos[playMode].setCurrentFrame( 0.0f );
+	m_playPos[playMode].setJumped( true );
 
 // send a signal if playposition changes during playback
 	if( isPlaying() ) 

src/gui/TimeLineWidget.cpp

@@ -375,6 +375,7 @@ void TimeLineWidget::mouseMoveEvent( QMouseEvent* event )
 					( 60 * 1000 / 48 ) ) /
 						Engine::getSong()->getTempo() );
 			m_pos.setCurrentFrame( 0 );
+			m_pos.setJumped( true );
 			updatePosition();
 			positionMarkerMoved();
 			break;