Initial ping-pong loop implementation

include/SampleBuffer.h

@@ -46,6 +46,11 @@ class EXPORT SampleBuffer : public QObject, public sharedObject
 {
 	Q_OBJECT
 public:
+	enum LoopMode {
+		LoopOff = 0,
+		LoopOn,
+		LoopPingPong
+	};
 	class EXPORT handleState
 	{
 	public:
@@ -62,11 +67,21 @@ public:
 			m_frameIndex = _index;
 		}
 
+		inline bool isBackwards() const
+		{
+			return m_isBackwards;
+		}
+		
+		inline void setBackwards( bool _backwards )
+		{
+			m_isBackwards = _backwards;
+		}
 
 
 	private:
 		f_cnt_t m_frameIndex;
 		const bool m_varyingPitch;
+		bool m_isBackwards;		
 		SRC_STATE * m_resamplingData;
 
 		friend class SampleBuffer;
@@ -86,7 +101,7 @@ public:
 	bool play( sampleFrame * _ab, handleState * _state,
 				const fpp_t _frames,
 				const float _freq,
-				const bool _looped = false );
+				const LoopMode _loopmode = LoopOff );
 
 	void visualize( QPainter & _p, const QRect & _dr, const QRect & _clip, f_cnt_t _from_frame = 0, f_cnt_t _to_frame = 0 );
 	inline void visualize( QPainter & _p, const QRect & _dr, f_cnt_t _from_frame = 0, f_cnt_t _to_frame = 0 )
@@ -108,7 +123,7 @@ public:
 	{
 		return m_endFrame;
 	}
-	
+
 	inline f_cnt_t loopStartFrame() const
 	{
 		return m_loopStartFrame;
@@ -273,9 +288,11 @@ private:
 	sample_rate_t m_sampleRate;
 
 	sampleFrame * getSampleFragment( f_cnt_t _start, f_cnt_t _frames,
-						bool _looped,
-						sampleFrame * * _tmp ) const;
+						LoopMode _loopmode,
+						sampleFrame * * _tmp,
+						bool * _backwards ) const;
 	f_cnt_t getLoopedIndex( f_cnt_t _index ) const;
+	f_cnt_t getPingPongIndex( f_cnt_t _index ) const;
 
 
 signals: