110 lines
2.9 KiB
Java
110 lines
2.9 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.media.MediaPlayer;
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import android.media.audiofx.Visualizer;
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import androidx.lifecycle.LiveData;
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import androidx.lifecycle.MutableLiveData;
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import timber.log.Timber;
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/**
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* Backward-compatible wrapper for {@link Visualizer}, 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 VisualizerController
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{
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private static final int PREFERRED_CAPTURE_SIZE = 128; // Must be a power of two.
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private static Boolean available = null;
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private static MutableLiveData<VisualizerController> instance = new MutableLiveData<>();
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public Visualizer visualizer;
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private int audioSessionId;
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/**
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* Retrieves the VisualizerController as LiveData
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*/
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public static LiveData<VisualizerController> get()
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{
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return instance;
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}
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/**
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* Initializes the VisualizerController instance with a MediaPlayer
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*/
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public static void create(MediaPlayer mediaPlayer)
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{
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if (mediaPlayer == null) return;
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if (!isAvailable()) return;
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VisualizerController controller = new VisualizerController();
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try
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{
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controller.audioSessionId = mediaPlayer.getAudioSessionId();
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controller.visualizer = new Visualizer(controller.audioSessionId);
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int[] captureSizeRange = Visualizer.getCaptureSizeRange();
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int captureSize = Math.max(PREFERRED_CAPTURE_SIZE, captureSizeRange[0]);
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captureSize = Math.min(captureSize, captureSizeRange[1]);
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controller.visualizer.setCaptureSize(captureSize);
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instance.postValue(controller);
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}
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catch (Throwable x)
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{
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Timber.w(x, "Failed to create visualizer.");
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}
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}
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/**
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* Releases the VisualizerController instance when the underlying MediaPlayer is no longer available
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*/
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public static void release()
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{
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VisualizerController controller = instance.getValue();
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if (controller == null) return;
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controller.visualizer.release();
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instance.postValue(null);
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}
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/**
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* Checks if the {@link Visualizer} class is available.
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*/
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private static boolean isAvailable()
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{
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if (available != null) return available;
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try
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{
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Class.forName("android.media.audiofx.Visualizer");
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available = true;
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}
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catch (Exception ex)
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{
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Timber.i(ex, "CheckAvailable received an exception getting class for the Visualizer");
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available = false;
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}
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return available;
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}
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} |