comparison src/CircularBuffer.h @ 96:c58f01834337

Merge branch 'release/1.0.4'

+//=======================================================================
+/** @file CircularBuffer.h
+ *  @brief A class for calculating onset detection functions
+ *  @author Adam Stark
+ *  @copyright Copyright (C) 2008-2014  Queen Mary University of London
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+//=======================================================================
+
+#ifndef CircularBuffer_h
+#define CircularBuffer_h
+
+#include <vector>
+
+//=======================================================================
+/** A circular buffer that allows you to add new samples to the end
+ * whilst removing them from the beginning. This is implemented in an
+ * efficient way which doesn't involve any memory allocation
+ */
+class CircularBuffer
+{
+public:
+    
+    /** Constructor */
+    CircularBuffer()
+     :  writeIndex (0)
+    {
+        
+    }
+    
+    /** Access the ith element in the buffer */
+    double &operator[] (int i)
+    {
+        int index = (i + writeIndex) % buffer.size();
+        return buffer[index];
+    }
+    
+    /** Add a new sample to the end of the buffer */
+    void addSampleToEnd (double v)
+    {
+        buffer[writeIndex] = v;
+        writeIndex = (writeIndex + 1) % buffer.size();
+    }
+    
+    /** Resize the buffer */
+    void resize (int size)
+    {
+        buffer.resize (size);
+        writeIndex = 0;
+    }
+    
+private:
+    
+    std::vector<double> buffer;
+    int writeIndex;
+};
+
+#endif /* CircularBuffer_hpp */