diff options
Diffstat (limited to 'subsonic-android/src/github/daneren2005/subphonic/audiofx/EqualizerController.java')
-rw-r--r-- | subsonic-android/src/github/daneren2005/subphonic/audiofx/EqualizerController.java | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/subsonic-android/src/github/daneren2005/subphonic/audiofx/EqualizerController.java b/subsonic-android/src/github/daneren2005/subphonic/audiofx/EqualizerController.java new file mode 100644 index 00000000..f2dbc352 --- /dev/null +++ b/subsonic-android/src/github/daneren2005/subphonic/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.subphonic.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.subphonic.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); + } + } +} + |