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diff --git a/javax/sound/sampled/spi/MixerProvider.java b/javax/sound/sampled/spi/MixerProvider.java
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+++ b/javax/sound/sampled/spi/MixerProvider.java
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+/* Mixer API
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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 2, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.sound.sampled.spi;
+
+import javax.sound.sampled.Mixer;
+
+/**
+ * This abstract class defines an interface to mixer providers.
+ * Concrete subclasses will implement the methods in this class.
+ * @since 1.3
+ */
+public abstract class MixerProvider
+{
+  /**
+   * Create a new mixer provider.
+   */
+  public MixerProvider()
+  {
+  }
+
+  /**
+   * Return a mixer that matches the given info object.
+   * @param info description of the mixer to match
+   * @return the mixer
+   * @throws IllegalArgumentException if no mixer matches the description
+   */
+  public abstract Mixer getMixer(Mixer.Info info);
+
+  /**
+   * Return an array of info objects describing all the mixers provided by
+   * this provider.
+   */
+  public abstract Mixer.Info[] getMixerInfo();
+
+  /**
+   * Return true if a mixer matching the provided description is supported.
+   * @param info description of the mixer to match
+   * @return true if it is supported by this provider
+   */
+  public boolean isMixerSupported(Mixer.Info info)
+  {
+    Mixer.Info[] infos = getMixerInfo();
+    for (int i = 0; i < infos.length; ++i)
+      {
+	if (info.equals(infos[i]))
+	  return true;
+      }
+    return false;
+  }
+}