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/*
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 net.sourceforge.subsonic.androidapp.audiofx;
import java.io.Serializable;
import android.content.Context;
import android.media.MediaPlayer;
import android.media.audiofx.Equalizer;
import android.util.Log;
import net.sourceforge.subsonic.androidapp.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);
}
}
}
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