content: /**
   * Copyright 2004-2006 DFKI GmbH.
   * All Rights Reserved.  Use is subject to license terms.
   * <p/>
   * This file is part of MARY TTS.
   * <p/>
   * MARY TTS is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation, version 3 of the License.
   * <p/>
   * 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 Lesser General Public License for more details.
   * <p/>
   * You should have received a copy of the GNU Lesser General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  package marytts.signalproc.analysis;
  
  import marytts.signalproc.process.InlineDataProcessor;
  import marytts.util.data.BufferedDoubleDataSource;
  import marytts.util.data.DoubleDataSource;
  
  /**
   * @author Marc Schr&ouml;der
   *         <p/>
   *         Computes energy of the input signal
   */
  public class Signal2EnergyConverter extends BufferedDoubleDataSource {
      protected static InlineDataProcessor processor = new InlineDataProcessor() {
          /**
           * For each signal sample, compute the signal energy as the square of the signal sample. 
           */
          @Override
          public void applyInline(double[] buf, int off, int len) {
              for (int i = off; i < off + len; i++) {
                  buf[i] = buf[i] * buf[i];
                  assert buf[i] >= 0;
              }
          }
      };
  
      public Signal2EnergyConverter(double[] signal) {
          super(signal, processor);
      }
  
      public Signal2EnergyConverter(DoubleDataSource signal) {
          super(signal, processor);
      }
  
      /**
       * For each signal sample, compute the signal energy as the square of the signal sample.
       *
       * @param nNew the number of items in buf preceding writePos to process
       */
      public void processNewData(int off, int len) {
          for (int i = off; i < off + len; i++) {
              buf[i] = buf[i] * buf[i];
              assert buf[i] >= 0;
          }
      }
  
  }
  
  