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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 github.daneren2005.dsub.audiofx;
import java.io.Serializable;
import android.content.Context;
import android.media.audiofx.BassBoost;
import android.media.audiofx.Equalizer;
import android.util.Log;
import github.daneren2005.dsub.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;
private BassBoost bass;
private boolean loudnessAvailable = false;
private LoudnessEnhancerController loudnessEnhancerController;
private boolean released = false;
private final int audioSessionId;
public EqualizerController(Context context, int audioSessionId) {
this.context = context;
this.audioSessionId = audioSessionId;
init();
}
private void init() {
equalizer = new Equalizer(0, audioSessionId);
bass = new BassBoost(0, audioSessionId);
loudnessAvailable = true;
loudnessEnhancerController = new LoudnessEnhancerController(audioSessionId);
}
public void saveSettings() {
try {
if (isAvailable()) {
FileUtil.serialize(context, new EqualizerSettings(equalizer, bass, loudnessEnhancerController), "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", EqualizerSettings.class);
if (settings != null) {
settings.apply(equalizer, bass, loudnessEnhancerController);
}
}
} catch (Throwable x) {
Log.w(TAG, "Failed to load equalizer settings.", x);
}
}
public boolean isAvailable() {
return equalizer != null && bass != null;
}
public boolean isEnabled() {
try {
return isAvailable() && equalizer.getEnabled();
} catch(Exception e) {
return false;
}
}
public void release() {
if (isAvailable()) {
released = true;
equalizer.release();
bass.release();
if(loudnessEnhancerController != null && loudnessEnhancerController.isAvailable()) {
loudnessEnhancerController.release();
}
}
}
public Equalizer getEqualizer() {
if(released) {
released = false;
try {
init();
} catch (Throwable x) {
equalizer = null;
released = true;
Log.w(TAG, "Failed to create equalizer.", x);
}
}
return equalizer;
}
public BassBoost getBassBoost() {
if(released) {
released = false;
try {
init();
} catch (Throwable x) {
bass = null;
Log.w(TAG, "Failed to create bass booster.", x);
}
}
return bass;
}
public LoudnessEnhancerController getLoudnessEnhancerController() {
if(loudnessAvailable && released) {
released = false;
try {
init();
} catch (Throwable x) {
loudnessEnhancerController = null;
Log.w(TAG, "Failed to create loudness enhancer.", x);
}
}
return loudnessEnhancerController;
}
private static class EqualizerSettings implements Serializable {
private final short[] bandLevels;
private final boolean enabled;
private short bass;
private int loudness;
public EqualizerSettings(Equalizer equalizer, BassBoost boost, LoudnessEnhancerController loudnessEnhancerController) {
enabled = equalizer.getEnabled();
bandLevels = new short[equalizer.getNumberOfBands()];
for (short i = 0; i < equalizer.getNumberOfBands(); i++) {
bandLevels[i] = equalizer.getBandLevel(i);
}
try {
bass = boost.getRoundedStrength();
} catch(Exception e) {
bass = 0;
}
try {
loudness = (int) loudnessEnhancerController.getGain();
} catch(Exception e) {
loudness = 0;
}
}
public void apply(Equalizer equalizer, BassBoost boost, LoudnessEnhancerController loudnessController) {
for (short i = 0; i < bandLevels.length; i++) {
equalizer.setBandLevel(i, bandLevels[i]);
}
equalizer.setEnabled(enabled);
if(bass != 0) {
boost.setEnabled(true);
boost.setStrength(bass);
}
if(loudness != 0) {
loudnessController.enable();
loudnessController.setGain(loudness);
}
}
}
}
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