Filters/FilterJpeg.cs

   1 //
   2 // FilterJpeg.cs
   3 //
   4 // Copyright (C) 2004 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.IO;
  29 using System.Text;
  30
  31 using Beagle.Util;
  32 using Beagle.Daemon;
  33
  34 using SemWeb;
  35
  36 namespace Beagle.Filters {
  37
  38         [PropertyKeywordMapping (Keyword="imagemodel",     PropertyName="exif:Model",    IsKeyword=true)]
  39         public class FilterJpeg : FilterImage {
  40
  41                 public FilterJpeg () : base ()
  42                 {
  43                         AddSupportedFlavor (FilterFlavor.NewFromMimeType ("image/jpeg"));
  44                 }
  45
  46                 // FIXME: This is not particularly efficient
  47                 protected override void PullImageProperties ()
  48                 {
  49                         JpegHeader header = new JpegHeader (Stream);
  50                         byte [] commentdata = header.GetJFIFComment();
  51                         if (commentdata != null && commentdata.Length != 0)
  52                         {
  53                                 string comment = System.Text.Encoding.Default.GetString( commentdata, 0, commentdata.Length );
  54                                 if (comment != null && comment != "") {
  55                                         AddProperty (Beagle.Property.New ("jfif:Comment", comment));
  56                                         AddProperty (Beagle.Property.NewUnstored ("fixme:comment", comment));
  57                                 }
  58                         }
  59
  60                         byte [] data = header.GetRawExif ();
  61                         if (data == null || data.Length == 0)
  62                                 return;
  63                         ExifData exif = new ExifData (data, (uint) data.Length);
  64                         if (exif == null)
  65                                 return;
  66
  67                         string str;
  68
  69                         str = exif.LookupFirstValue (ExifTag.UserComment);
  70                         if (str != null && str != "") {
  71                                 AddProperty (Beagle.Property.New ("exif:UserComment", str));
  72                                 AddProperty (Beagle.Property.NewUnstored ("fixme:comment", str));
  73                         }
  74
  75
  76                         str = exif.LookupFirstValue (ExifTag.ImageDescription);
  77                         if (str != null && str != "") {
  78                                 AddProperty (Beagle.Property.New ("exif:ImageDescription", str));
  79                                 AddProperty (Beagle.Property.NewUnstored ("fixme:comment", str));
  80                         }
  81
  82                         str = exif.LookupFirstValue (ExifTag.PixelXDimension);
  83                         if (str != null && str != "") {
  84                                 Width = Int32.Parse (str);
  85                                 AddProperty (Beagle.Property.NewUnsearched ("exif:PixelXDimension", str));
  86                         }
  87
  88                         str = exif.LookupFirstValue (ExifTag.PixelYDimension);
  89                         if (str != null && str != "") {
  90                                 Height = Int32.Parse (str);
  91                                 AddProperty (Beagle.Property.NewUnsearched ("exif:PixelYDimension", str));
  92                         }
  93
  94                         str = exif.LookupFirstValue (ExifTag.ISOSpeedRatings);
  95                         if (str != null && str != "")
  96                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ISOSpeedRatings", str));
  97
  98                         str = exif.LookupFirstValue (ExifTag.ShutterSpeedValue);
  99                         if (str != null && str != "")
 100                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ShutterSpeedValue", str));
 101
 102                         str = exif.LookupFirstValue (ExifTag.ExposureTime);
 103                         if (str != null && str != "")
 104                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ExposureTime", str));
 105
 106                         str = exif.LookupFirstValue (ExifTag.FNumber);
 107                         if (str != null && str != "")
 108                                 AddProperty (Beagle.Property.NewUnsearched ("exif:FNumber", str));
 109
 110                         str = exif.LookupFirstValue (ExifTag.ApertureValue);
 111                         if (str != null && str != "")
 112                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ApertureValue", str));
 113
 114                         str = exif.LookupFirstValue (ExifTag.FocalLength);
 115                         if (str != null && str != "")
 116                                 AddProperty (Beagle.Property.NewUnsearched ("exif:FocalLength", str));
 117
 118                         str = exif.LookupFirstValue (ExifTag.Flash);
 119                         if (str != null && str != "")
 120                                 AddProperty (Beagle.Property.NewUnsearched ("exif:Flash", str));
 121
 122                         str = exif.LookupFirstValue (ExifTag.Model);
 123                         if (str != null && str != "")
 124                                 AddProperty (Beagle.Property.NewKeyword ("exif:Model", str));
 125
 126                         str = exif.LookupFirstValue (ExifTag.Copyright);
 127                         if (str != null && str != "")
 128                                 AddProperty (Beagle.Property.New ("exif:Copyright", str));
 129
 130                         str = exif.LookupFirstValue (ExifTag.DateTime);
 131                         if (str != null && str != "") {
 132                                 try {
 133                                         DateTime dt = ExifUtil.DateTimeFromString (str);
 134                                         AddProperty (Beagle.Property.NewDate ("exif:DateTime", dt));
 135                                 } catch (ArgumentOutOfRangeException) {
 136                                         Logger.Log.Debug("EXIF DateTime '{0}' is invalid.", str);
 137                                 }
 138                         }
 139
 140                         byte [] xmp_data = header.GetRawXmp ();
 141
 142                         if (xmp_data != null) {
 143                                 int i;
 144                                 for (i = 0; i < xmp_data.Length; i++)
 145                                         if (xmp_data [i] == 0) {
 146                                                 i++;
 147                                                 break;
 148                                         }
 149
 150                                 XmpFile xmp = new XmpFile (new MemoryStream (xmp_data, i, xmp_data.Length - i));
 151                                 AddXmpProperties (xmp);
 152                         }
 153
 154                         Finished (); // That's all folks...
 155                 }
 156         }
 157 }