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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 android.content.Context;
import android.media.audiofx.Visualizer;
import android.util.Log;
/**
* Backward-compatible wrapper for {@link Visualizer}, which is API Level 9.
*
* @author Sindre Mehus
* @version $Id$
*/
public class VisualizerController {
private static final String TAG = VisualizerController.class.getSimpleName();
private static final int PREFERRED_CAPTURE_SIZE = 128; // Must be a power of two.
private final Context context;
private Visualizer visualizer;
private boolean released = false;
private int audioSessionId = 0;
// Class initialization fails when this throws an exception.
static {
try {
Class.forName("android.media.audiofx.Visualizer");
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
/**
* Throws an exception if the {@link Visualizer} class is not available.
*/
public static void checkAvailable() throws Throwable {
// Calling here forces class initialization.
}
public VisualizerController(Context context, int audioSessionId) {
this.context = context;
try {
this.audioSessionId = audioSessionId;
visualizer = new Visualizer(audioSessionId);
} catch (Throwable x) {
Log.w(TAG, "Failed to create visualizer.", x);
}
if (visualizer != null) {
int[] captureSizeRange = Visualizer.getCaptureSizeRange();
int captureSize = Math.max(PREFERRED_CAPTURE_SIZE, captureSizeRange[0]);
captureSize = Math.min(captureSize, captureSizeRange[1]);
visualizer.setCaptureSize(captureSize);
}
}
public boolean isAvailable() {
return visualizer != null;
}
public boolean isEnabled() {
return isAvailable() && visualizer.getEnabled();
}
public void release() {
if (isAvailable()) {
visualizer.release();
released = true;
}
}
public Visualizer getVisualizer() {
if(released) {
released = false;
try {
visualizer = new Visualizer(audioSessionId);
} catch (Throwable x) {
visualizer = null;
Log.w(TAG, "Failed to create visualizer.", x);
}
}
return visualizer;
}
}
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