1 /*
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8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
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11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
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24  */
25 
26 package com.sun.media.sound;
27 
28 import javax.sound.sampled.Mixer;
29 import javax.sound.sampled.Mixer.Info;
30 import javax.sound.sampled.spi.MixerProvider;
31 
32 /**
33  * Provider for software audio mixer.
34  *
35  * @author Karl Helgason
36  */
37 public final class SoftMixingMixerProvider extends MixerProvider {
38 
39     static SoftMixingMixer globalmixer = null;
40 
41     static Thread lockthread = null;
42 
43     static final Object mutex = new Object();
44 
45     @Override
getMixer(Info info)46     public Mixer getMixer(Info info) {
47         if (!(info == null || info == SoftMixingMixer.info)) {
48             throw new IllegalArgumentException("Mixer " + info.toString()
49                     + " not supported by this provider.");
50         }
51         synchronized (mutex) {
52             if (lockthread != null)
53                 if (Thread.currentThread() == lockthread)
54                     throw new IllegalArgumentException("Mixer "
55                             + info.toString()
56                             + " not supported by this provider.");
57             if (globalmixer == null)
58                 globalmixer = new SoftMixingMixer();
59             return globalmixer;
60         }
61     }
62 
63     @Override
getMixerInfo()64     public Info[] getMixerInfo() {
65         return new Info[] { SoftMixingMixer.info };
66     }
67 }
68