Specify infinte timeout in tryLock on export

Ensures remote plugins always process sound on export.
Follow-up of 408b72c.

Author: PhysSong

plugins/VstEffect/VstEffect.cpp

@@ -95,7 +95,7 @@ bool VstEffect::processAudioBuffer( sampleFrame * _buf, const fpp_t _frames )
 		sampleFrame * buf = new sampleFrame[_frames];
 #endif
 		memcpy( buf, _buf, sizeof( sampleFrame ) * _frames );
-		if (m_pluginMutex.tryLock())
+		if (m_pluginMutex.tryLock(Engine::getSong()->isExporting() ? -1 : 0))
 		{
 			m_plugin->process( buf, buf );
 			m_pluginMutex.unlock();

plugins/vestige/vestige.cpp

@@ -47,6 +47,7 @@
 #include "GuiApplication.h"
 #include "PixmapButton.h"
 #include "SampleBuffer.h"
+#include "Song.h"
 #include "StringPairDrag.h"
 #include "TextFloat.h"
 #include "ToolTip.h"
@@ -360,7 +361,7 @@ void vestigeInstrument::loadFile( const QString & _file )
 
 void vestigeInstrument::play( sampleFrame * _buf )
 {
-	if (!m_pluginMutex.tryLock()) {return;}
+	if (!m_pluginMutex.tryLock(Engine::getSong()->isExporting() ? -1 : 0)) {return;}
 
 	const fpp_t frames = Engine::mixer()->framesPerPeriod();
 

plugins/zynaddsubfx/ZynAddSubFx.cpp

@@ -40,6 +40,7 @@
 #include "InstrumentPlayHandle.h"
 #include "InstrumentTrack.h"
 #include "gui_templates.h"
+#include "Song.h"
 #include "StringPairDrag.h"
 #include "RemoteZynAddSubFx.h"
 #include "LocalZynAddSubFx.h"
@@ -325,7 +326,7 @@ QString ZynAddSubFxInstrument::nodeName() const
 
 void ZynAddSubFxInstrument::play( sampleFrame * _buf )
 {
-	if (!m_pluginMutex.tryLock()) {return;}
+	if (!m_pluginMutex.tryLock(Engine::getSong()->isExporting() ? -1 : 0)) {return;}
 	if( m_remotePlugin )
 	{
 		m_remotePlugin->process( NULL, _buf );