Version 4.4.2

src/LentPitShift.cpp

@@ -0,0 +1,52 @@
+/***************************************************/
+/*! \class LentPitShift
+    \brief Pitch shifter effect class based on the Lent algorithm.
+
+    This class implements a pitch shifter using pitch 
+    tracking and sample windowing and shifting.
+
+    by Francois Germain, 2009.
+*/
+/***************************************************/
+
+#include "LentPitShift.h"
+
+namespace stk {
+
+LentPitShift::LentPitShift( StkFloat periodRatio, int tMax )
+  : inputFrames(0.,tMax,1), outputFrames(0.,tMax,1), ptrFrames(0), inputPtr(0), outputPtr(0.), tMax_(tMax), periodRatio_(periodRatio), zeroFrame(0., tMax, 1)
+{
+	window = new StkFloat[2*tMax_]; // Allocation of the array for the hamming window
+	threshold_ = 0.1;               // Default threshold for pitch tracking
+
+	dt = new StkFloat[tMax+1]; // Allocation of the euclidian distance coefficient array.  The first one is never used.
+	cumDt = new StkFloat[tMax+1];  // Allocation of the cumulative sum array
+	cumDt[0] = 0.;                 // Initialization of the first coefficient of the cumulative sum
+	dpt = new StkFloat[tMax+1];    // Allocation of the pitch tracking function coefficient array
+	dpt[0]   = 1.;                 // Initialization of the first coefficient of dpt which is always the same
+
+	// Initialisation of the input and output delay lines
+	inputLine_.setMaximumDelay( 3 * tMax_ );
+	// The delay is choosed such as the coefficients are not read before being finalised.
+	outputLine_.setMaximumDelay( 3 * tMax_ );
+	outputLine_.setDelay( 3 * tMax_ );
+
+	//Initialization of the delay line of pitch tracking coefficients
+	//coeffLine_ = new Delay[512];
+	//for(int i=0;i<tMax_;i++)
+	//	coeffLine_[i] = new Delay( tMax_, tMax_ );
+}
+
+void LentPitShift :: clear()
+{
+	inputLine_.clear();
+	outputLine_.clear();
+}
+
+void LentPitShift :: setShift( StkFloat shift )
+{
+  if ( shift <= 0.0 ) periodRatio_ = 1.0;
+  periodRatio_ = 1.0 / shift; 
+}
+
+} // stk namespace