Implement Tunnel Player workaround code

Issue: "Visualization does not work on the new Galaxy devices"
  felixpalmer#5

src/com/pheelicks/app/MainActivity.java

@@ -17,6 +17,7 @@
 import android.os.Bundle;
 import android.view.View;
 
+import com.pheelicks.utils.TunnelPlayerWorkaround;
 import com.pheelicks.visualizer.R;
 import com.pheelicks.visualizer.VisualizerView;
 import com.pheelicks.visualizer.renderer.BarGraphRenderer;
@@ -29,6 +30,7 @@
  */
 public class MainActivity extends Activity {
   private MediaPlayer mPlayer;
+  private MediaPlayer mSilentPlayer;  /* to avoid tunnel player issue */
   private VisualizerView mVisualizerView;
 
   /** Called when the activity is first created. */
@@ -42,6 +44,7 @@ public void onCreate(Bundle savedInstanceState) {
   protected void onResume()
   {
     super.onResume();
+    initTunnelPlayerWorkaround();
     init();
   }
 
@@ -82,6 +85,30 @@ private void cleanUp()
       mPlayer.release();
       mPlayer = null;
     }
+
+    if (mSilentPlayer != null)
+    {
+      mSilentPlayer.release();
+      mSilentPlayer = null;
+    }
+  }
+
+  // Workaround (for Galaxy S4)
+  //
+  // "Visualization does not work on the new Galaxy devices"
+  //    https://github.com/felixpalmer/android-visualizer/issues/5
+  //
+  // NOTE: 
+  //   This code is not required for visualizing default "test.mp3" file,
+  //   because tunnel player is used when duration is longer than 1 minute.
+  //   (default "test.mp3" file: 8 seconds)
+  //
+  private void initTunnelPlayerWorkaround() {
+    // Read "tunnel.decode" system property to determine
+    // the workaround is needed
+    if (TunnelPlayerWorkaround.isTunnelDecodeEnabled(this)) {
+      mSilentPlayer = TunnelPlayerWorkaround.createSilentMediaPlayer(this);
+    }
   }
 
   // Methods for adding renderers to visualizer

src/com/pheelicks/utils/SystemPropertiesProxy.java

@@ -0,0 +1,73 @@
+/**
+ * Copyright 2013, Haruki Hasegawa
+ *
+ * Licensed under the MIT license:
+ * http://creativecommons.org/licenses/MIT/
+ */
+
+/**
+ * from http://stackoverflow.com/questions/2641111/where-is-android-os-systemproperties
+ */
+
+package com.pheelicks.utils;
+
+import java.lang.reflect.Method;
+
+import android.content.Context;
+import android.util.Log;
+
+public class SystemPropertiesProxy {
+  private static final String TAG = "SystemPropertiesProxy";
+
+  /**
+   * Get the value for the given key, returned as a boolean. Values 'n', 'no',
+   * '0', 'false' or 'off' are considered false. Values 'y', 'yes', '1', 'true'
+   * or 'on' are considered true. (case insensitive). If the key does not exist,
+   * or has any other value, then the default result is returned.
+   * 
+   * @param key the key to lookup
+   * @param def a default value to return
+   * @return the key parsed as a boolean, or def if the key isn't found or is
+   *         not able to be parsed as a boolean.
+   * @throws IllegalArgumentException if the key exceeds 32 characters
+   */
+  public static Boolean getBoolean(Context context, String key, boolean def)
+      throws IllegalArgumentException {
+    return getBoolean(context.getClassLoader(), key, def);
+  }
+
+  public static Boolean getBoolean(ClassLoader cl, String key, boolean def)
+      throws IllegalArgumentException {
+
+    Boolean ret = def;
+
+    try {
+      @SuppressWarnings("rawtypes")
+      Class SystemProperties = cl.loadClass("android.os.SystemProperties");
+
+      // Parameters Types
+      @SuppressWarnings("rawtypes")
+      Class[] paramTypes = new Class[2];
+      paramTypes[0] = String.class;
+      paramTypes[1] = boolean.class;
+
+      @SuppressWarnings("unchecked")
+      Method getBoolean = SystemProperties.getMethod("getBoolean", paramTypes);
+
+      // Parameters
+      Object[] params = new Object[2];
+      params[0] = new String(key);
+      params[1] = Boolean.valueOf(def);
+
+      ret = (Boolean) getBoolean.invoke(SystemProperties, params);
+
+    } catch (IllegalArgumentException iAE) {
+      throw iAE;
+    } catch (Exception e) {
+      Log.e(TAG, "getBoolean(context, key: " + key + ", def:" + def + ")", e);
+      ret = def;
+    }
+
+    return ret;
+  }
+}

src/com/pheelicks/utils/TunnelPlayerWorkaround.java

@@ -0,0 +1,72 @@
+/**
+ * Copyright 2013, Haruki Hasegawa
+ *
+ * Licensed under the MIT license:
+ * http://creativecommons.org/licenses/MIT/
+ */
+
+package com.pheelicks.utils;
+
+import java.io.IOException;
+
+import android.content.Context;
+import android.media.AudioManager;
+import android.media.MediaPlayer;
+import android.util.Log;
+
+import com.pheelicks.visualizer.R;
+
+public class TunnelPlayerWorkaround {
+  private static final String TAG = "TunnelPlayerWorkaround";
+
+  private static final String SYSTEM_PROP_TUNNEL_DECODE_ENABLED = "tunnel.decode";
+
+  private TunnelPlayerWorkaround()
+  {
+  }
+
+  /**
+   * Obtain "tunnel.decod" system property value
+   * 
+   * @param context Context
+   * @return Whether tunnel player is enabled
+   */
+  public static boolean isTunnelDecodeEnabled(Context context)
+  {
+    return SystemPropertiesProxy.getBoolean(
+        context, SYSTEM_PROP_TUNNEL_DECODE_ENABLED, false);
+  }
+
+  /**
+   * Create silent MediaPlayer instance to avoid tunnel player issue
+   * 
+   * @param context Context
+   * @return MediaPlayer instance
+   */
+  public static MediaPlayer createSilentMediaPlayer(Context context)
+  {
+    boolean result = false;
+
+    MediaPlayer mp = null;
+    try {
+      mp = MediaPlayer.create(context, R.raw.workaround_1min);
+      mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
+
+      // NOTE: start() is no needed
+      // mp.start();
+
+      result = true;
+    } catch (RuntimeException e) {
+      Log.e(TAG, "createSilentMediaPlayer()", e);
+    } finally {
+      if (!result && mp != null) {
+        try {
+          mp.release();
+        } catch (IllegalStateException e) {
+        }
+      }
+    }
+
+    return mp;
+  }
+}