Source for gnu.javax.sound.midi.dssi.DSSIMidiDeviceProvider

   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: }