Initial code check in continued

src/buffer/FloatCircularAveragingBuffer.java

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+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 Dennis Sheirer
+ * 
+ *     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/>
+ ******************************************************************************/
+package buffer;
+
+import java.util.Arrays;
+
+/**
+ * Circular sample buffer - allocates a buffer and stores samples in a circular
+ * fashion, overwriting older samples with newly arrived samples.  Initially
+ * fills buffer with 0-valued samples
+ * 
+ * Produces no output.  Obtain the average buffer value on-demand via the 
+ * getAverage() method
+ */
+public class FloatCircularAveragingBuffer
+{
+	private float[] mBuffer;
+	private int mBufferPointer = 0;
+	private int mSampleCountForAveraging;
+	private int mCurrentSampleCount = 0;
+	private float mAverage = 0.0f;
+	
+	public FloatCircularAveragingBuffer( int size, int sampleCountForAveraging )
+	{
+		mBuffer = new float[ size ];
+		mSampleCountForAveraging = sampleCountForAveraging;
+		Arrays.fill( mBuffer, 0.0f );
+	}
+
+	/**
+	 * Convenience wrapper to throw away to put the new sample and throwaway
+	 * the oldest sample
+	 */
+	public void put( float newestSample )
+	{
+		get( newestSample );
+	}
+
+	/**
+	 * Loads the newest sample into the buffer and returns the oldest sample
+	 */
+	public float get( float newestSample )
+	{
+		float oldestSample = mBuffer[ mBufferPointer ];
+		
+		mBuffer[ mBufferPointer ] = newestSample;
+		
+		mBufferPointer++;
+		
+		if( mBufferPointer >= mBuffer.length )
+		{
+			mBufferPointer = 0;
+		}
+		
+		mCurrentSampleCount++;
+		
+		if( mCurrentSampleCount >= mSampleCountForAveraging )
+		{
+			calculateAverage();
+			
+			mCurrentSampleCount = 0;
+		}
+		
+		return oldestSample;
+	}
+
+	/**
+	 * Calculates the average of the maximum and minimum values present in 
+	 * the buffer
+	 */
+	private void calculateAverage()
+	{
+		float min = mBuffer[ 0 ];
+		float max = mBuffer[ 0 ];
+		
+		for( int x = 0; x < mBuffer.length; x++ )
+		{
+			if( mBuffer[ x ] < min )
+			{
+				min = mBuffer[ x ];
+			}
+			if( mBuffer[ x ] > max )
+			{
+				max = mBuffer[ x ];
+			}
+		}
+		
+		mAverage = (float)( ( min + max ) / 2.0f );
+	}
+	
+	public float getAverage()
+	{
+		return mAverage;
+	}
+}