libjava/classpath/gnu/javax/sound/sampled/gstreamer/io/GstAudioFileReaderNativePeer.java

   1 /*GstAudioFileReaderNativePeer -- GNU Classpath GStreamer AudioFileReader
   2   native peer class.
   3  Copyright (C) 2007 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Classpath.
   6
   7 GNU Classpath is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Classpath is distributed in the hope that it will be useful, but
  13 WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Classpath; see the file COPYING.  If not, write to the
  19 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301 USA.
  21
  22 Linking this library statically or dynamically with other modules is
  23 making a combined work based on this library.  Thus, the terms and
  24 conditions of the GNU General Public License cover the whole
  25 combination.
  26
  27 As a special exception, the copyright holders of this library give you
  28 permission to link this library with independent modules to produce an
  29 executable, regardless of the license terms of these independent
  30 modules, and to copy and distribute the resulting executable under
  31 terms of your choice, provided that you also meet, for each linked
  32 independent module, the terms and conditions of the license of that
  33 module.  An independent module is a module which is not derived from
  34 or based on this library.  If you modify this library, you may extend
  35 this exception to your version of the library, but you are not
  36 obligated to do so.  If you do not wish to do so, delete this
  37 exception statement from your version. */
  38
  39 package gnu.javax.sound.sampled.gstreamer.io;
  40
  41 import gnu.javax.sound.sampled.gstreamer.GStreamerMixer;
  42
  43 import java.io.BufferedInputStream;
  44 import java.io.File;
  45 import java.io.IOException;
  46 import java.io.InputStream;
  47 import java.net.URL;
  48 import java.util.HashMap;
  49 import java.util.Map;
  50
  51 import javax.sound.sampled.AudioFormat;
  52 import javax.sound.sampled.AudioSystem;
  53 import javax.sound.sampled.AudioFormat.Encoding;
  54
  55 /**
  56  * GStreamer native peer for GstAudioFileReader.
  57  *
  58  * @author Mario Torre <neugens@limasoftware.net>
  59  */
  60 final class GstAudioFileReaderNativePeer
  61 {
  62   private static final String GST_ENCODING = "GStreamer Generic Audio Reader";
  63
  64   private static class GstHeader
  65   {
  66     /*
  67      * NOTE: these properties are accessed by the native code, be careful
  68      * if you change them.
  69      * Not all the fields are necessarily set.
  70      *
  71      */
  72     public String file = null;
  73
  74     public String suffix = null;
  75
  76     public String name = null;
  77
  78     public String mimetype = null;
  79
  80     public String endianness = null;
  81
  82     public String channels = null;
  83
  84     public String rate = null;
  85
  86     public String width = null;
  87
  88     public String depth = null;
  89
  90     public String isSigned = null;
  91
  92     public String layer = null;
  93     public String bitrate = null;
  94     public String framed = null;
  95     public String type = null;
  96   }
  97
  98   public static AudioFormat getAudioFormat(File file) throws Exception
  99   {
 100     GstHeader header = new GstHeader();
 101     header.file = file.getAbsolutePath();
 102
 103     if (!gstreamer_get_audio_format_file(header))
 104       return null;
 105
 106     return getAudioFormat(header);
 107   }
 108
 109   public static AudioFormat getAudioFormat(InputStream is) throws Exception
 110   {
 111     GstHeader header = new GstHeader();
 112
 113     BufferedInputStream stream = new BufferedInputStream(is);
 114     if(!stream.markSupported())
 115       throw new IOException("Stream must support marking.");
 116
 117     stream.mark(0);
 118
 119     if (!gstreamer_get_audio_format_stream(header, stream))
 120       return null;
 121
 122     return getAudioFormat(header);
 123   }
 124
 125   public static AudioFormat getAudioFormat(URL url) throws Exception
 126   {
 127     GstHeader header = new GstHeader();
 128     header.file = url.toExternalForm();
 129
 130     BufferedInputStream stream = new BufferedInputStream(url.openStream());
 131     if(!stream.markSupported())
 132       throw new IOException("Stream must support marking.");
 133
 134     stream.mark(0);
 135
 136     if (!gstreamer_get_audio_format_stream(header, stream))
 137       return null;
 138
 139     return getAudioFormat(header);
 140   }
 141
 142   private static Encoding getEncoding(GstHeader header)
 143   {
 144     StringBuilder buffer = new StringBuilder();
 145
 146     if (header.name == null)
 147       {
 148         buffer.append(GST_ENCODING);
 149         if (header.mimetype != null)
 150           {
 151             buffer.append(" ");
 152             buffer.append(header.mimetype);
 153           }
 154
 155         header.name = buffer.toString();
 156       }
 157     else
 158       {
 159         // strip the "decoder" word from the name, if any
 160         // this is a bit ugly, the alternative would be to still output the
 161         // full name of the decoder/demuxer
 162         String lowerCase = header.name.toLowerCase();
 163         int index = lowerCase.indexOf("decoder");
 164         if (index == -1)
 165           {
 166             index = lowerCase.indexOf("demuxer");
 167           }
 168
 169         if (index == -1)
 170           index = lowerCase.length();
 171
 172         buffer.append(header.name.substring(0, index));
 173
 174       }
 175
 176     return new Encoding(buffer.toString().trim());
 177   }
 178
 179   private static AudioFormat getAudioFormat(GstHeader header)
 180     throws Exception
 181   {
 182     int na = AudioSystem.NOT_SPECIFIED;
 183
 184     /* we use mimetype as an header, but this could have some side effects */
 185     Encoding encoding = getEncoding(header);
 186
 187     float sampleRate = ((header.rate != null) ?
 188                          new Float(header.rate).floatValue() : na);
 189
 190     int sampleSizeInBits = ((header.depth != null) ?
 191                              new Integer(header.depth).intValue() : na);
 192
 193     int channels = ((header.channels != null) ?
 194                      new Integer(header.channels).intValue() : na);
 195
 196     boolean bigEndian = false;
 197     if (header.endianness != null)
 198       {
 199         if (header.endianness.compareTo("4321") == 0)
 200           bigEndian = true;
 201       }
 202
 203     int frameSize = na;
 204     float frameRate = na;
 205     String lowerCase = header.name.toLowerCase();
 206
 207     // FIXME: frameRate = sampleRate in these cases under all the tests so far
 208     // but I'm not sure if this is always correct...
 209     if (lowerCase.contains("law") || lowerCase.contains("au") ||
 210         lowerCase.contains("x-au"))
 211       {
 212         frameSize = (sampleSizeInBits >> 3) * channels;
 213         frameRate = sampleRate;
 214       }
 215     else if (lowerCase.contains("wav"))
 216       {
 217         frameSize = ((sampleSizeInBits + 7) / 8) * channels;
 218         frameRate = sampleRate;
 219       }
 220     else if (lowerCase.contains("iff"))
 221       {
 222         frameSize = (sampleSizeInBits * channels) / 8;
 223         frameRate = sampleRate;
 224       }
 225
 226     // write all the additional properties we got to identify
 227     // the gstreamer plugin actually used to deal with this stream
 228     Map<String, Object> properties = new HashMap<String, Object>();
 229     properties.put(GStreamerMixer.GST_BACKEND, true);
 230     properties.put(GStreamerMixer.GST_DECODER, header.name);
 231
 232     /* now we put in some of the additional properties if we have them */
 233     if (header.type != null) properties.put("type", header.type);
 234     if (header.framed != null) properties.put("framed", header.framed);
 235     if (header.bitrate != null) properties.put("bitrate", header.bitrate);
 236     if (header.isSigned != null) properties.put("isSigned", header.isSigned);
 237     if (header.depth != null) properties.put("depth", header.depth);
 238     if (header.mimetype != null) properties.put("mimetype", header.mimetype);
 239
 240     AudioFormat format = new AudioFormat(encoding,
 241                                          sampleRate,
 242                                          sampleSizeInBits,
 243                                          channels,
 244                                          frameSize,
 245                                          frameRate,
 246                                          bigEndian,
 247                                          properties);
 248     return format;
 249   }
 250
 251   /* ***** native methods ***** */
 252
 253   /**
 254    * Retrieve header information about the file being played.
 255    *
 256    * @param info
 257    * @return
 258    */
 259   native static final
 260   protected boolean gstreamer_get_audio_format_stream(GstHeader info,
 261                                                BufferedInputStream istream);
 262
 263   /**
 264    * Retrieve header information about the file being played.
 265    *
 266    * @param info
 267    * @return
 268    */
 269   native static final
 270   protected boolean gstreamer_get_audio_format_file(GstHeader info);
 271
 272   static
 273   {
 274     System.loadLibrary("gstreamerpeer"); //$NON-NLS-1$
 275   }
 276 }