1 files changed, 138 insertions, 0 deletions
diff --git a/subsonic-android/src/github/daneren2005/subdroid/audiofx/EqualizerController.java b/subsonic-android/src/github/daneren2005/subdroid/audiofx/EqualizerController.java
new file mode 100644
index 00000000..f51a3c99
--- /dev/null
+++ b/subsonic-android/src/github/daneren2005/subdroid/audiofx/EqualizerController.java
@@ -0,0 +1,138 @@
+/*
+ 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.subdroid.audiofx;
+
+import java.io.Serializable;
+
+import android.content.Context;
+import android.media.MediaPlayer;
+import android.media.audiofx.Equalizer;
+import android.util.Log;
+import github.daneren2005.subdroid.util.FileUtil;
+
+/**
+ * Backward-compatible wrapper for {@link Equalizer}, which is API Level 9.
+ *
+ * @author Sindre Mehus
+ * @version $Id$
+ */
+public class EqualizerController {
+
+    private static final String TAG = EqualizerController.class.getSimpleName();
+
+    private final Context context;
+    private Equalizer equalizer;
+
+    // Class initialization fails when this throws an exception.
+    static {
+        try {
+            Class.forName("android.media.audiofx.Equalizer");
+        } catch (Exception ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+    /**
+     * Throws an exception if the {@link Equalizer} class is not available.
+     */
+    public static void checkAvailable() throws Throwable {
+        // Calling here forces class initialization.
+    }
+
+    public EqualizerController(Context context, MediaPlayer mediaPlayer) {
+        this.context = context;
+        try {
+            equalizer = new Equalizer(0, mediaPlayer.getAudioSessionId());
+        } catch (Throwable x) {
+            Log.w(TAG, "Failed to create equalizer.", x);
+        }
+    }
+
+    public void saveSettings() {
+        try {
+            if (isAvailable()) {
+                FileUtil.serialize(context, new EqualizerSettings(equalizer), "equalizer.dat");
+            }
+        } catch (Throwable x) {
+            Log.w(TAG, "Failed to save equalizer settings.", x);
+        }
+    }
+
+    public void loadSettings() {
+        try {
+            if (isAvailable()) {
+                EqualizerSettings settings = FileUtil.deserialize(context, "equalizer.dat");
+                if (settings != null) {
+                    settings.apply(equalizer);
+                }
+            }
+        } catch (Throwable x) {
+            Log.w(TAG, "Failed to load equalizer settings.", x);
+        }
+    }
+
+    public boolean isAvailable() {
+        return equalizer != null;
+    }
+
+    public boolean isEnabled() {
+        return isAvailable() && equalizer.getEnabled();
+    }
+
+    public void release() {
+        if (isAvailable()) {
+            equalizer.release();
+        }
+    }
+
+    public Equalizer getEqualizer() {
+        return equalizer;
+    }
+
+    private static class EqualizerSettings implements Serializable {
+
+        private final short[] bandLevels;
+        private short preset;
+        private final boolean enabled;
+
+        public EqualizerSettings(Equalizer equalizer) {
+            enabled = equalizer.getEnabled();
+            bandLevels = new short[equalizer.getNumberOfBands()];
+            for (short i = 0; i < equalizer.getNumberOfBands(); i++) {
+                bandLevels[i] = equalizer.getBandLevel(i);
+            }
+            try {
+                preset = equalizer.getCurrentPreset();
+            } catch (Exception x) {
+                preset = -1;
+            }
+        }
+
+        public void apply(Equalizer equalizer) {
+            for (short i = 0; i < bandLevels.length; i++) {
+                equalizer.setBandLevel(i, bandLevels[i]);
+            }
+            if (preset >= 0 && preset < equalizer.getNumberOfPresets()) {
+                equalizer.usePreset(preset);
+            }
+            equalizer.setEnabled(enabled);
+        }
+    }
+}
+