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    1   /*
    2    * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   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    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   package com.sun.media.sound;
   26   
   27   import javax.sound.sampled.Mixer;
   28   import javax.sound.sampled.Mixer.Info;
   29   import javax.sound.sampled.spi.MixerProvider;
   30   
   31   /**
   32    * Provider for software audio mixer
   33    *
   34    * @author Karl Helgason
   35    */
   36   public class SoftMixingMixerProvider extends MixerProvider {
   37   
   38       static SoftMixingMixer globalmixer = null;
   39   
   40       static Thread lockthread = null;
   41   
   42       protected final static Object mutex = new Object();
   43   
   44       public Mixer getMixer(Info info) {
   45           if (!(info == null || info == SoftMixingMixer.info)) {
   46               throw new IllegalArgumentException("Mixer " + info.toString()
   47                       + " not supported by this provider.");
   48           }
   49           synchronized (mutex) {
   50               if (lockthread != null)
   51                   if (Thread.currentThread() == lockthread)
   52                       throw new IllegalArgumentException("Mixer "
   53                               + info.toString()
   54                               + " not supported by this provider.");
   55               if (globalmixer == null)
   56                   globalmixer = new SoftMixingMixer();
   57               return globalmixer;
   58           }
   59   
   60       }
   61   
   62       public Info[] getMixerInfo() {
   63           return new Info[] { SoftMixingMixer.info };
   64       }
   65   
   66   }

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