Android Open Source - cwp-morse-mangle C W State Change Queue From Morse Code

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License

The source code is released under:

Copyright (C) 2012 Jussi Kivilinna <jussi.kivilinna@gmail.com> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "S...

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Java Source Code

/*
 * Copyright (C) 2012 Jussi Kivilinna <jussi.kivilinna@gmail.com>
 */*  w w  w  . j  a  v  a2s. co  m*/
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

package fi_81.cwp_morse_mangle.cwp;

import java.util.Deque;

import fi_81.cwp_morse_mangle.cwp.CWStateChange;
import fi_81.cwp_morse_mangle.morse.BitString;

public class CWStateChangeQueueFromMorseCode {
  private static int signalWidth = 1;
  private static int signalJitterThreshold = 0;
  private static double signalJitter = 0.0;

  public static void setSignalWidth(int signalWidth) {
    assert (signalWidth > 0);

    CWStateChangeQueueFromMorseCode.signalWidth = signalWidth;
  }

  public static void setSignalJitter(int threshold, double jitter) {
    signalJitterThreshold = threshold;
    signalJitter = jitter;
  }

  public static int getSignalWidth() {
    return signalWidth;
  }

  public void encode(Deque<CWStateChange> states, BitString bits) {
    int i, len = bits.length();
    boolean isUp = false;
    int timestamp = 0;
    int duration = 0;

    for (i = 0; i < len; i++) {
      if (bits.charAt(i) == '1') {
        if (!isUp) {
          /* State change, down to up. With timestamp. */
          states.add(new CWStateChange(CWStateChange.TYPE_DOWN_TO_UP,
              timestamp, timestamp));
          isUp = true;
          duration = 0;
        }
      } else {
        if (isUp) {
          /* State change, up to down. With duration */
          states.add(new CWStateChange(CWStateChange.TYPE_UP_TO_DOWN,
              duration, timestamp));
          isUp = false;
        }
      }

      int add = signalWidth;
      if (add >= signalJitterThreshold && signalJitter > 0.0
          && signalJitter < 0.5) {
        double jitter = 2 * signalJitter * (Math.random() - 0.5) + 1.0;

        add = (int) Math.round((double) add * jitter);
      }

      timestamp += add;
      duration += add;
    }

    /* if left in up-state, append up-to-down state change */
    if (isUp)
      states.add(new CWStateChange(CWStateChange.TYPE_UP_TO_DOWN,
          duration, timestamp));
  }
}

Java Source Code List