Android Open Source - voicesmith Delayed Pcm In Device

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Back to project page voicesmith.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Voicesmith <http://voicesmith.jurihock.de/>
 */*from  www . j  a  v  a  2s.  c  om*/
 * 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.io.pcm;

import java.io.IOException;
import java.util.Arrays;

import android.content.Context;
import de.jurihock.voicesmith.audio.HeadsetMode;

public final class DelayedPcmInDevice extends PcmInDevice
{
  private double  delayTime    = 0;
  private int    delaySamples  = 0;
  private int    remainingZeros  = 0;

  public DelayedPcmInDevice(Context context, HeadsetMode headsetMode)
    throws IOException
  {
    super(context, headsetMode);
  }

  public DelayedPcmInDevice(Context context, int sampleRate)
    throws IOException
  {
    super(context, sampleRate);
  }

  public DelayedPcmInDevice(Context context) throws IOException
  {
    super(context);
  }

  public double getDelay()
  {
    return delayTime;
  }

  public void setDelay(double seconds)
  {
    delayTime = seconds;

    final int oldDelay = delaySamples - remainingZeros;
    if (oldDelay > 0)
    {
      final short[] oldSamples = new short[oldDelay];
      read(oldSamples);
    }

    delaySamples = (int) (delayTime * getSampleRate());
    remainingZeros = delaySamples;
  }

  @Override
  public int read(short[] buffer, int offset, int count)
  {
    if (getDelay() == 0 || remainingZeros == 0)
    {
      return super.read(buffer, offset, count);
    }

    if (remainingZeros >= count)
    {
      try
      {
        Arrays.fill(buffer, offset, offset + count, (short) 0);

        return count;
      }
      finally
      {
        remainingZeros -= count;
      }
    }
    else
    {
      try
      {
        Arrays.fill(buffer, offset, offset + remainingZeros, (short) 0);

        return super.read(buffer, offset + remainingZeros,
          count - remainingZeros);
      }
      finally
      {
        remainingZeros = 0;
      }
    }
  }
}

Java Source Code List

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