Android Open Source - Resonos-Android-Framework Audio Visualizer

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License

The source code is released under:

Apache License

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Java Source Code

package com.resonos.apps.library.media;
/*from   w ww . j a v  a  2  s  . c om*/
import android.media.MediaPlayer;
import android.media.audiofx.Visualizer;

import com.resonos.apps.library.App;

/**
 * This class makes using the Android visualizer object a bit easier
 * based on some code from https://github.com/felixpalmer/android-visualizer/
 * Thread safe.
 * @author Chris
 *
 */
public class AudioVisualizer {
  
  // vars
  private byte[] mBytes;
  private byte[] mFFTBytes;
  
  // objects
  private Visualizer mVisualizer;

  /**
   * Create a visualizer object
   * @param app object
   */
  public AudioVisualizer(App app) {
    init();
  }

  private void init() {
    mBytes = null;
    mFFTBytes = null;
  }

  /**
   * Links the visualizer to a MediaPlayer
   * @param player - MediaPlayer instance to link to
   */
  public synchronized void link(MediaPlayer player) {
    if (mVisualizer != null)
      mVisualizer.release();
    
    // Create the Visualizer object and attach it to our media player.
    if (player == null)
      mVisualizer = new Visualizer(0);
    else
      mVisualizer = new Visualizer(player.getAudioSessionId());

    mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);

    // Pass through Visualizer data to VisualizerView
    Visualizer.OnDataCaptureListener captureListener = new Visualizer.OnDataCaptureListener() {
      @Override
      public void onWaveFormDataCapture(Visualizer visualizer,
          byte[] bytes, int samplingRate) {
        updateVisualizer(bytes);
      }

      @Override
      public void onFftDataCapture(Visualizer visualizer, byte[] bytes,
          int samplingRate) {
        updateVisualizerFFT(bytes);
      }
    };

    mVisualizer.setDataCaptureListener(captureListener,
        Visualizer.getMaxCaptureRate() / 2, true, true);

    // Enabled Visualizer and disable when we're done with the stream
    mVisualizer.setEnabled(true);
    if (player != null)
      player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mediaPlayer) {
          mVisualizer.setEnabled(false);
        }
      });
  }

  /**
   * Free resources
   */
  public synchronized void release() {
    if (mVisualizer != null)
      mVisualizer.release();
  }

  private synchronized void updateVisualizer(byte[] bytes) {
    mBytes = bytes;
  }
  
  /**
   * @return A byte array of the most recent audio data.
   */
  public synchronized byte[] getAudioData() {
    return mBytes;
  }
  
  private synchronized void updateVisualizerFFT(byte[] bytes) {
    mFFTBytes = bytes;
  }
  
  /**
   * @return A byte array of the most recent audio FFT data.
   */
  public synchronized byte[] getAudioFFTData() {
    return mFFTBytes;
  }
}

Java Source Code List