Source for gnu.javax.sound.sampled.gstreamer.io.GstAudioFileReader

   1: /*GstAudioFileReader -- GNU Classpath GStreamer AudioFileReader.
   2:  Copyright (C) 2007 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: package gnu.javax.sound.sampled.gstreamer.io;
  39: 
  40: import gnu.java.lang.CPStringBuilder;
  41: 
  42: import gnu.javax.sound.sampled.gstreamer.GStreamerMixer;
  43: 
  44: import java.io.BufferedInputStream;
  45: import java.io.File;
  46: import java.io.FileInputStream;
  47: import java.io.IOException;
  48: import java.io.InputStream;
  49: import java.net.URL;
  50: import javax.sound.sampled.AudioFileFormat;
  51: import javax.sound.sampled.AudioFormat;
  52: import javax.sound.sampled.AudioInputStream;
  53: import javax.sound.sampled.AudioSystem;
  54: import javax.sound.sampled.UnsupportedAudioFileException;
  55: import javax.sound.sampled.spi.AudioFileReader;
  56: 
  57: /**
  58:  * An implementation of a general AudioFileReader. Uses GStreamer to
  59:  * parse and retrieve informations about the file passed as input.
  60:  *
  61:  * @author Mario Torre <neugens@limasoftware.net>
  62:  */
  63: public class GstAudioFileReader
  64:     extends AudioFileReader
  65: {
  66:   @Override
  67:   public AudioFileFormat getAudioFileFormat(File file)
  68:       throws UnsupportedAudioFileException, IOException
  69:   {
  70:     CPStringBuilder name = new CPStringBuilder(file.getName());
  71:     String _name = name.substring(name.lastIndexOf(".") + 1);
  72: 
  73:     return getAudioFileFormat(
  74:                new BufferedInputStream(new FileInputStream(file)), _name);
  75:   }
  76: 
  77:   @Override
  78:   public AudioFileFormat getAudioFileFormat(InputStream is)
  79:       throws UnsupportedAudioFileException, IOException
  80:   {
  81:     return getAudioFileFormat(is, null);
  82:   }
  83: 
  84:   private AudioFileFormat getAudioFileFormat(InputStream is, String extension)
  85:     throws UnsupportedAudioFileException
  86:     {
  87:       AudioFormat format = null;
  88:       try
  89:         {
  90:           format = GstAudioFileReaderNativePeer.getAudioFormat(is);
  91:         }
  92:       catch (Exception e)
  93:         {
  94:           UnsupportedAudioFileException ex =
  95:             new UnsupportedAudioFileException("Unsupported encoding.");
  96: 
  97:           ex.initCause(ex.getCause());
  98:           throw ex;
  99:         }
 100: 
 101:       if (format == null)
 102:         throw new UnsupportedAudioFileException("Unsupported encoding.");
 103: 
 104:       String name = format.getProperty(GStreamerMixer.GST_DECODER).toString();
 105: 
 106:       if (extension == null)
 107:         {
 108:           extension =
 109:             format.getProperty(GStreamerMixer.GST_FILE_EXTENSION).toString();
 110:         }
 111: 
 112:       AudioFileFormat.Type type =
 113:         new AudioFileFormat.Type(name, extension);
 114: 
 115:       // TODO: we should calculate this in some way. We don't need it, but
 116:       // application may want to use this data.
 117:       return new AudioFileFormat(type, format, AudioSystem.NOT_SPECIFIED);
 118:     }
 119: 
 120:   @Override
 121:   public AudioFileFormat getAudioFileFormat(URL url)
 122:       throws UnsupportedAudioFileException, IOException
 123:   {
 124:     return getAudioFileFormat(new BufferedInputStream(url.openStream()));
 125:   }
 126: 
 127:   @Override
 128:   public AudioInputStream getAudioInputStream(File file)
 129:       throws UnsupportedAudioFileException, IOException
 130:   {
 131:     InputStream stream = new FileInputStream(file);
 132:     long length = file.length();
 133: 
 134:     AudioFormat format = null;
 135: 
 136:     try
 137:       {
 138:         format = GstAudioFileReaderNativePeer.getAudioFormat(file);
 139:       }
 140:     catch (Exception e)
 141:       {
 142:         UnsupportedAudioFileException ex =
 143:           new UnsupportedAudioFileException("Unsupported encoding.");
 144: 
 145:         ex.initCause(ex.getCause());
 146:         throw ex;
 147:       }
 148: 
 149:     // get the header size
 150:     if (format == null)
 151:       throw new UnsupportedAudioFileException("Unsupported encoding.");
 152: 
 153:     return new AudioInputStream(stream, format, length);
 154:   }
 155: 
 156:   @Override
 157:   public AudioInputStream getAudioInputStream(InputStream is)
 158:       throws UnsupportedAudioFileException, IOException
 159:   {
 160:     AudioFormat format = null;
 161: 
 162:     try
 163:       {
 164:         format = GstAudioFileReaderNativePeer.getAudioFormat(is);
 165:       }
 166:     catch (Exception e)
 167:       {
 168:         // TODO Auto-generated catch block
 169:         e.printStackTrace();
 170:       }
 171: 
 172:     // get the header size
 173:     if (format == null)
 174:       throw new UnsupportedAudioFileException("Unsupported encoding.");
 175: 
 176:     return new AudioInputStream(is, format, AudioSystem.NOT_SPECIFIED);
 177:   }
 178: 
 179:   @Override
 180:   public AudioInputStream getAudioInputStream(URL url)
 181:       throws UnsupportedAudioFileException, IOException
 182:   {
 183:     return getAudioInputStream(new BufferedInputStream(url.openStream()));
 184:   }
 185: }