Android Open Source - voicesmith Amplify Processor

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From Project

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Voicesmith <http://voicesmith.jurihock.de/>
 */* w w w  . ja  va2 s  . c o  m*/
 * Copyright (c) 2011-2014 Juergen Hock
 *
 * 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 de.jurihock.voicesmith.dsp.processors;

import android.content.Context;
import de.jurihock.voicesmith.Preferences;
import de.jurihock.voicesmith.dsp.Math;

public final class AmplifyProcessor
{
  private final float  ampFactor;

  public AmplifyProcessor(Context context)
  {
    this(new Preferences(context).getSignalAmplificationFactor());
  }

  /**
   * @param ampDecibel
   *            Amplification level in [dB].
   * */
  public AmplifyProcessor(int ampDecibel)
  {
    // http://www.sengpielaudio.com/Rechner-pegelaenderung.htm
    ampFactor = Math.pow(10F, ampDecibel / 20F);
  }

  public void processFrame(short[] frame)
  {
    if (ampFactor == 1) return;

    for (int i = 0; i < frame.length; i++)
    {
      float result = frame[i] * ampFactor;

      if (result > 32767F)
      {
        frame[i] = 32767;
      }
      else if (result < -32768F)
      {
        frame[i] = -32768;
      }
      else
      {
        frame[i] = (short) result;
      }
    }
  }
}

Java Source Code List

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