Android Open Source - yammp Visualizer Compat Scoop

From Project

Back to project page yammp.
License

The source code is released under:
GNU Lesser General Public License
If you think the Android project yammp listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package org.yammp.util;
/* w  ww .  jav a2  s.co  m*/
import java.lang.reflect.Method;
import java.util.Timer;
import java.util.TimerTask;

import org.yammp.util.VisualizerWrapper.OnDataChangedListener;

import android.os.Handler;
import android.os.Message;

public class VisualizerCompatScoop extends VisualizerCompat {

  private OnDataChangedListener mListener;

  private boolean mWaveEnabled, mFftEnabled;
  private boolean mVisualizerEnabled;
  private Timer mTimer;

  private Handler mVisualizerHandler = new Handler() {

    @Override
    public void handleMessage(Message msg) {
      switch (msg.what) {
        case WAVE_CHANGED:
          if (mListener != null) {
            short[] wave_data = (short[]) ((Object[]) msg.obj)[0];
            int len = (Integer) ((Object[]) msg.obj)[1];
            mListener.onWaveDataChanged(transform(wave_data, 128),
                (int) (len * accuracy), true);
          }
          break;
        case FFT_CHANGED:
          if (mListener != null) {
            short[] fft_data = (short[]) ((Object[]) msg.obj)[0];
            int len = (Integer) ((Object[]) msg.obj)[1];
            mListener.onFftDataChanged(transform(fft_data, 32), (int) (len * accuracy));
          }
          break;
      }
    }
  };

  public VisualizerCompatScoop(int audioSessionId, int fps) {
    super(audioSessionId, fps);
    duration = 1000 / fps;
    mTimer = new Timer();

  }

  @Override
  public boolean getEnabled() {
    return mVisualizerEnabled;
  }

  @Override
  public void release() {

  }

  @Override
  public void setAccuracy(float accuracy) {
    if (accuracy > 1.0f || accuracy <= 0.0f)
      throw new IllegalArgumentException(
          "Invalid accuracy value! Allowed value range is \"0 < accuracy <= 1.0\"!");
    this.accuracy = accuracy;

  }

  @Override
  public void setEnabled(boolean enabled) {
    if (mTimer != null) {
      if (enabled) {
        mTimer = new Timer();
        mTimer.scheduleAtFixedRate(new VisualizerTimer(), 0, duration);
      } else {
        mTimer.cancel();
      }
    }
    mVisualizerEnabled = enabled;
  }

  @Override
  public void setFftEnabled(boolean fft) {
    mFftEnabled = fft;

  }

  @Override
  public void setOnDataChangedListener(OnDataChangedListener listener) {

    mListener = listener;
  }

  @Override
  public void setWaveFormEnabled(boolean wave) {
    mWaveEnabled = wave;

  }

  private int snoop(short[] outData, int kind) {

    try {
      Method m = Class.forName("android.media.MediaPlayer").getMethod("snoop",
          outData.getClass(), Integer.TYPE);
      m.setAccessible(true);
      return (Integer) m.invoke(Class.forName("android.media.MediaPlayer"), outData, kind);
    } catch (Exception e) {
      return 0;
    }
  }

  private byte[] transform(short[] orig, int divider) {
    byte[] result = new byte[orig.length];
    for (int i = 0; i < orig.length; i++) {
      short temp = (short) (orig[i] / divider);
      if (temp > Byte.MAX_VALUE) {
        temp = Byte.MAX_VALUE;
      }
      if (temp < Byte.MIN_VALUE) {
        temp = Byte.MIN_VALUE;
      }
      result[i] = (byte) temp;
    }
    return result;
  }

  private class VisualizerTimer extends TimerTask {

    @Override
    public void run() {
      short[] wave_data = new short[1024];
      short[] fft_data = new short[1024];
      if (mWaveEnabled) {
        int len = snoop(wave_data, 0);
        if (len != 0) {
          Message msg = new Message();
          msg.what = WAVE_CHANGED;
          msg.obj = new Object[] { wave_data, len };
          mVisualizerHandler.sendMessage(msg);
        }
      }
      if (mFftEnabled) {
        int len = snoop(fft_data, 1);
        if (len != 0) {
          Message msg = new Message();
          msg.what = FFT_CHANGED;
          msg.obj = new Object[] { fft_data, len };
          mVisualizerHandler.sendMessage(msg);
        }
      }

    }

  }

}
Java Source Code List
