gomp-20050608-branch/libjava/classpath/gnu/javax/sound/midi/dssi/DSSIMidiDeviceProvider.java

   1 /* DSSIMidiDeviceProvider.java -- DSSI Device Provider
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.javax.sound.midi.dssi;
  40
  41 import java.util.ArrayList;
  42 import java.util.List;
  43 import java.io.File;
  44 import java.io.FilenameFilter;
  45
  46 import gnu.classpath.Configuration;
  47 import gnu.javax.sound.midi.alsa.AlsaMidiSequencerDevice;
  48
  49 import javax.sound.midi.MidiDevice;
  50 import javax.sound.midi.MidiDevice.Info;
  51 import javax.sound.midi.spi.MidiDeviceProvider;
  52
  53 /**
  54  * A DSSI MIDI device provider.
  55  *
  56  * DSSI (pronounced "dizzy") is an API for audio plugins, with particular
  57  * application for software synthesis plugins with native user interfaces.
  58  *
  59  * Read about DSSI at http://dssi.sourceforge.net
  60  *
  61  * @author Anthony Green (green@redhat.com)
  62  *
  63  */
  64 public class DSSIMidiDeviceProvider extends MidiDeviceProvider
  65 {
  66   /**
  67    * The MidiDevice.Info specialized for DSSI synthesizers.
  68    *
  69    * @author Anthony Green (green@redhat.com)
  70    *
  71    */
  72   private static class DSSIInfo extends Info
  73   {
  74     String soname;
  75     long index;
  76
  77     public DSSIInfo(String name, String vendor, String description,
  78                     String version, String soname, long index)
  79     {
  80       super(name, vendor, description, version);
  81       this.soname = soname;
  82       this.index = index;
  83     }
  84   }
  85
  86   static native long dlopen_(String soname);
  87   static native void dlclose_(long sohandle);
  88   static native long getDSSIHandle_(long sohandle, long index);
  89   static native String getDSSIName_(long handle);
  90   static native String getDSSICopyright_(long handle);
  91   static native String getDSSIVendor_(long handle);
  92   static native String getDSSILabel_(long handle);
  93
  94   private static List examineLibrary(String soname)
  95   {
  96      List list = new ArrayList();
  97      long index = 0;
  98      long handle;
  99
 100      long sohandle = dlopen_(soname);
 101      if (sohandle == 0)
 102        return list;
 103      do
 104      {
 105        handle = getDSSIHandle_(sohandle, index);
 106        if (handle == 0)
 107          break;
 108        String name = getDSSILabel_(handle);
 109        String copyright = getDSSICopyright_(handle);
 110        String label = getDSSIName_(handle);
 111        String vendor = getDSSIVendor_(handle);
 112        list.add(new DSSIInfo(name, vendor, label,
 113                              "DSSI-1", soname, index));
 114        index++;
 115      } while (true);
 116
 117      // Close the library and free memory
 118      dlclose_(sohandle);
 119
 120      return list;
 121   }
 122
 123   private static DSSIInfo[] infos;
 124
 125   static
 126   {
 127     if (Configuration.INIT_LOAD_LIBRARY)
 128       System.loadLibrary("gjsmdssi");
 129
 130     File dssidir = new File("/usr/lib/dssi/");
 131     String sofiles[] = dssidir.list(new FilenameFilter()
 132                                     {
 133                                       public boolean accept(File dir, String n)
 134                                       {
 135                                         return n.endsWith(".so");
 136                                       }
 137                                     });
 138     List ilist = new ArrayList();
 139     for (int i = 0; i < sofiles.length; i++)
 140       ilist.addAll(examineLibrary(new File(dssidir, sofiles[i]).getAbsolutePath()));
 141     infos = (DSSIInfo[]) ilist.toArray(new DSSIInfo[ilist.size()]);
 142   }
 143
 144   public DSSIMidiDeviceProvider()
 145   {
 146     // Empty.
 147   }
 148
 149   /* Return the Info array.
 150    * @see javax.sound.midi.spi.MidiDeviceProvider#getDeviceInfo()
 151    */
 152   public Info[] getDeviceInfo()
 153   {
 154     return infos;
 155   }
 156
 157   /* Get a MIDI Device for info.
 158    * @see javax.sound.midi.spi.MidiDeviceProvider#getDevice(javax.sound.midi.MidiDevice.Info)
 159    */
 160   public MidiDevice getDevice(Info info)
 161   {
 162     for (int i = 0; i < infos.length; i++)
 163     {
 164       if (info.equals(infos[i]))
 165       {
 166           return new DSSISynthesizer(infos[i],
 167                                      infos[i].soname,
 168                                      infos[i].index);
 169       }
 170     }
 171     throw new IllegalArgumentException("Don't recognize MIDI device " + info);
 172   }
 173 }