1 files changed, 104 insertions, 0 deletions
diff --git a/src/github/daneren2005/dsub/audiofx/VisualizerController.java b/src/github/daneren2005/dsub/audiofx/VisualizerController.java
new file mode 100644
index 00000000..b32245f4
--- /dev/null
+++ b/src/github/daneren2005/dsub/audiofx/VisualizerController.java
@@ -0,0 +1,104 @@
+/*
+ This file is part of Subsonic.
+
+ Subsonic 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.
+
+ Subsonic 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 Subsonic.  If not, see <http://www.gnu.org/licenses/>.
+
+ Copyright 2011 (C) Sindre Mehus
+ */
+package github.daneren2005.dsub.audiofx;
+
+import android.content.Context;
+import android.media.MediaPlayer;
+import android.media.audiofx.Visualizer;
+import android.util.Log;
+
+/**
+ * Backward-compatible wrapper for {@link Visualizer}, which is API Level 9.
+ *
+ * @author Sindre Mehus
+ * @version $Id$
+ */
+public class VisualizerController {
+
+    private static final String TAG = VisualizerController.class.getSimpleName();
+    private static final int PREFERRED_CAPTURE_SIZE = 128; // Must be a power of two.
+
+    private final Context context;
+    private Visualizer visualizer;
+	private boolean released = false;
+	private int audioSessionId = 0;
+
+    // Class initialization fails when this throws an exception.
+    static {
+        try {
+            Class.forName("android.media.audiofx.Visualizer");
+        } catch (Exception ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+    /**
+     * Throws an exception if the {@link Visualizer} class is not available.
+     */
+    public static void checkAvailable() throws Throwable {
+        // Calling here forces class initialization.
+    }
+
+    public VisualizerController(Context context, MediaPlayer mediaPlayer) {
+        this.context = context;
+        try {
+			audioSessionId = mediaPlayer.getAudioSessionId();
+            visualizer = new Visualizer(audioSessionId);
+        } catch (Throwable x) {
+            Log.w(TAG, "Failed to create visualizer.", x);
+        }
+
+        if (visualizer != null) {
+            int[] captureSizeRange = Visualizer.getCaptureSizeRange();
+            int captureSize = Math.max(PREFERRED_CAPTURE_SIZE, captureSizeRange[0]);
+            captureSize = Math.min(captureSize, captureSizeRange[1]);
+            visualizer.setCaptureSize(captureSize);
+        }
+    }
+
+    public boolean isAvailable() {
+        return visualizer != null;
+    }
+
+    public boolean isEnabled() {
+        return isAvailable() && visualizer.getEnabled();
+    }
+
+    public void release() {
+        if (isAvailable()) {
+            visualizer.release();
+			released = true;
+        }
+    }
+
+    public Visualizer getVisualizer() {
+		if(released) {
+			released = false;
+			try {
+				visualizer = new Visualizer(audioSessionId);
+			} catch (Throwable x) {
+				visualizer = null;
+				Log.w(TAG, "Failed to create visualizer.", x);
+			}
+		}
+		
+        return visualizer;
+    }
+}
+