201 lines
3.8 KiB
Java
201 lines
3.8 KiB
Java
/*
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This file is part of Subsonic.
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Subsonic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Subsonic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2011 (C) Sindre Mehus
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*/
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package org.moire.ultrasonic.audiofx;
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import android.content.Context;
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import android.media.MediaPlayer;
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import android.media.audiofx.Equalizer;
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import timber.log.Timber;
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import org.moire.ultrasonic.util.FileUtil;
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import java.io.Serializable;
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/**
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* Backward-compatible wrapper for {@link Equalizer}, which is API Level 9.
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*
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* @author Sindre Mehus
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* @version $Id$
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*/
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public class EqualizerController
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{
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private final Context context;
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private Equalizer equalizer;
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private boolean released;
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private int audioSessionId;
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// Class initialization fails when this throws an exception.
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static
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{
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try
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{
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Class.forName("android.media.audiofx.Equalizer");
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}
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catch (Exception ex)
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{
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throw new RuntimeException(ex);
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}
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}
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/**
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* Throws an exception if the {@link Equalizer} class is not available.
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*/
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public static void checkAvailable() throws Throwable
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{
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// Calling here forces class initialization.
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}
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public EqualizerController(Context context, MediaPlayer mediaPlayer)
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{
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this.context = context;
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try
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{
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if (mediaPlayer == null)
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{
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return;
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}
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audioSessionId = mediaPlayer.getAudioSessionId();
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equalizer = new Equalizer(0, audioSessionId);
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}
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catch (Throwable x)
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{
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equalizer = null;
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Timber.w(x, "Failed to create equalizer.");
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}
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}
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public void saveSettings()
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{
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try
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{
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if (isAvailable())
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{
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FileUtil.serialize(context, new EqualizerSettings(equalizer), "equalizer.dat");
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}
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}
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catch (Throwable x)
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{
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Timber.w(x, "Failed to save equalizer settings.");
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}
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}
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public void loadSettings()
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{
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try
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{
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if (isAvailable())
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{
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EqualizerSettings settings = FileUtil.deserialize(context, "equalizer.dat");
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if (settings != null)
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{
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settings.apply(equalizer);
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}
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}
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}
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catch (Throwable x)
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{
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Timber.w(x, "Failed to load equalizer settings.");
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}
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}
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public boolean isAvailable()
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{
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return equalizer != null;
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}
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public void release()
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{
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if (isAvailable())
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{
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released = true;
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equalizer.release();
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}
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}
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public Equalizer getEqualizer()
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{
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if (released)
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{
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released = false;
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try
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{
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equalizer = new Equalizer(0, audioSessionId);
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}
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catch (Throwable x)
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{
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equalizer = null;
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Timber.w(x, "Failed to create equalizer.");
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}
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}
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return equalizer;
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}
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private static class EqualizerSettings implements Serializable
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{
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/**
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*
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*/
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private static final long serialVersionUID = 626565082425206061L;
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private final short[] bandLevels;
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private short preset;
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private final boolean enabled;
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public EqualizerSettings(Equalizer equalizer)
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{
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enabled = equalizer.getEnabled();
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bandLevels = new short[equalizer.getNumberOfBands()];
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for (short i = 0; i < equalizer.getNumberOfBands(); i++)
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{
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bandLevels[i] = equalizer.getBandLevel(i);
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}
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try
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{
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preset = equalizer.getCurrentPreset();
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}
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catch (Exception x)
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{
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preset = -1;
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}
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}
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public void apply(Equalizer equalizer)
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{
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for (short i = 0; i < bandLevels.length; i++)
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{
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equalizer.setBandLevel(i, bandLevels[i]);
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}
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if (preset >= 0 && preset < equalizer.getNumberOfPresets())
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{
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equalizer.usePreset(preset);
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}
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equalizer.setEnabled(enabled);
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}
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}
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}
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