Merge pull request #2237 from M374LX/iss1878

Fix #1878

include/Engine.h

@@ -46,7 +46,7 @@ class EXPORT Engine : public QObject
 {
 	Q_OBJECT
 public:
-	static void init();
+	static void init( bool renderOnly );
 	static void destroy();
 
 	// core

include/Mixer.h

@@ -57,6 +57,7 @@ class MidiClient;
 class AudioPort;
 
 
+const fpp_t MINIMUM_BUFFER_SIZE = 32;
 const fpp_t DEFAULT_BUFFER_SIZE = 256;
 
 const int BYTES_PER_SAMPLE = sizeof( sample_t );
@@ -382,7 +383,7 @@ private:
 	} ;
 
 
-	Mixer();
+	Mixer( bool renderOnly );
 	virtual ~Mixer();
 
 	void startProcessing( bool _needs_fifo = true );