Version 4.0

src/Echo.cpp

@@ -0,0 +1,79 @@
+/***************************************************/
+/*! \class Echo
+    \brief STK echo effect class.
+
+    This class implements a echo effect.
+
+    by Perry R. Cook and Gary P. Scavone, 1995 - 2002.
+*/
+/***************************************************/
+
+#include "Echo.h"
+#include <iostream.h>
+
+Echo :: Echo(MY_FLOAT longestDelay)
+{
+  length = (long) longestDelay + 2;
+  delayLine = new Delay(length>>1, length);
+  effectMix = 0.5;
+  this->clear();
+}
+
+Echo :: ~Echo()
+{
+  delete delayLine;
+}
+
+void Echo :: clear()
+{
+  delayLine->clear();
+  lastOutput = 0.0;
+}
+
+void Echo :: setDelay(MY_FLOAT delay)
+{
+  MY_FLOAT size = delay;
+  if ( delay < 0.0 ) {
+    cerr << "Echo: setDelay parameter is less than zero!" << endl;
+    size = 0.0;
+  }
+  else if ( delay > length ) {
+    cerr << "Echo: setDelay parameter is greater than delay length!" << endl;
+    size = length;
+  }
+
+  delayLine->setDelay((long)size);
+}
+
+void Echo :: setEffectMix(MY_FLOAT mix)
+{
+  effectMix = mix;
+  if ( mix < 0.0 ) {
+    cerr << "Echo: setEffectMix parameter is less than zero!" << endl;
+    effectMix = 0.0;
+  }
+  else if ( mix > 1.0 ) {
+    cerr << "Echo: setEffectMix parameter is greater than 1.0!" << endl;
+    effectMix = 1.0;
+  }
+}
+
+MY_FLOAT Echo :: lastOut() const
+{
+  return lastOutput;
+}
+
+MY_FLOAT Echo :: tick(MY_FLOAT input)
+{
+  lastOutput = effectMix * delayLine->tick(input);
+  lastOutput += input * (1.0 - effectMix);
+  return lastOutput;
+}
+
+MY_FLOAT *Echo :: tick(MY_FLOAT *vector, unsigned int vectorSize)
+{
+  for (unsigned int i=0; i<vectorSize; i++)
+    vector[i] = tick(vector[i]);
+
+  return vector;
+}