Diff: Audio/KarplusStrong.h

Revision:

13:bb0ec927e458

Child:

15:aa5a4c350251

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Audio/KarplusStrong.h	Sun Apr 17 21:35:23 2016 +0000
@@ -0,0 +1,65 @@
+
+/**
+ * The processor used for teh implementation of Karplus strong.
+ *
+ * @author Austin Suszek
+ */
+
+#ifndef AS_KARPLUS_STRONG_H
+#define AS_KARPLUS_STRONG_H
+
+#include <math.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include "../Constants.h"
+
+class KarplusStrong {
+public:
+    
+    /**
+     * Constructor
+     */
+    KarplusStrong();
+    
+    /**
+     * Signal the start of a new note.
+     *
+     * @param key The integer representation of the note
+     * @param velocity The float representation of the velocity (NOT int!)
+     */
+    void midiNoteOn(int key, float velocity);
+    
+    /**
+     * Create the initial buffer sample for the specific index.
+     *
+     * @param bufferIndex The index to process
+     * @return The new sample to save in the buffer
+     */
+    float fillBuffer(const int bufferIndex);
+    
+    /**
+     * Process the existing buffer for the specific index.
+     *
+     * @param inputSample The sample to process from the buffer
+     * @return The modified sample to save in the buffer
+     */
+    float processBuffer(const float inputSample);
+    
+private:
+
+    static void initializeNoiseSeed();
+    static float getRand() {
+        return float(rand()) / float(RAND_MAX);   
+    };
+    
+    float lastOutput;
+    float filterCoefficient;
+    float nextFilterCoefficient;
+    float velocity;
+    
+    float lowpassFilter(const float output, const float input, const float smoothingFactor);
+
+};
+
+#endif
\ No newline at end of file