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 namespace Beagle.Filters {
  35
  36         public class FilterJpeg : FilterImage {
  37
  38                 public FilterJpeg () : base ()
  39                 {
  40                         AddSupportedFlavor (FilterFlavor.NewFromMimeType ("image/jpeg"));
  41                 }
  42
  43                 // FIXME: This is not particularly efficient
  44                 protected override void PullImageProperties ()
  45                 {
  46                         JpegHeader header = new JpegHeader (Stream);
  47                         byte [] commentdata = header.GetJFIFComment();
  48                         if (commentdata != null && commentdata.Length != 0)
  49                         {
  50                                 string comment = System.Text.Encoding.ASCII.GetString( commentdata, 0, commentdata.Length );
  51                                 if (comment != null && comment != "")
  52                                         AddProperty (Beagle.Property.New ("jfif:Comment", comment));
  53                         }
  54
  55                         byte [] data = header.GetRawExif ();
  56                         if (data == null || data.Length == 0)
  57                                 return;
  58                         ExifData exif = new ExifData (data, (uint) data.Length);
  59                         if (exif == null)
  60                                 return;
  61
  62                         string str;
  63
  64                         str = exif.LookupFirstValue (ExifTag.UserComment);
  65                         if (str != null && str != "")
  66                                 AddProperty (Beagle.Property.New ("exif:UserComment", str));
  67
  68                         str = exif.LookupFirstValue (ExifTag.ImageDescription);
  69                         if (str != null && str != "")
  70                                 AddProperty (Beagle.Property.New ("exif:ImageDescription", str));
  71
  72                         str = exif.LookupFirstValue (ExifTag.PixelXDimension);
  73                         if (str != null && str != "")
  74                                 AddProperty (Beagle.Property.NewKeyword ("exif:PixelXDimension", str));
  75
  76                         str = exif.LookupFirstValue (ExifTag.PixelYDimension);
  77                         if (str != null && str != "")
  78                                 AddProperty (Beagle.Property.NewKeyword ("exif:PixelYDimension", str));
  79
  80                         str = exif.LookupFirstValue (ExifTag.ISOSpeedRatings);
  81                         if (str != null && str != "")
  82                                 AddProperty (Beagle.Property.NewKeyword ("exif:ISOSpeedRatings", str));
  83
  84                         str = exif.LookupFirstValue (ExifTag.ShutterSpeedValue);
  85                         if (str != null && str != "")
  86                                 AddProperty (Beagle.Property.NewKeyword ("exif:ShutterSpeedValue", str));
  87
  88                         str = exif.LookupFirstValue (ExifTag.ExposureTime);
  89                         if (str != null && str != "")
  90                                 AddProperty (Beagle.Property.NewKeyword ("exif:ExposureTime", str));
  91
  92                         str = exif.LookupFirstValue (ExifTag.FNumber);
  93                         if (str != null && str != "")
  94                                 AddProperty (Beagle.Property.NewKeyword ("exif:FNumber", str));
  95
  96                         str = exif.LookupFirstValue (ExifTag.ApertureValue);
  97                         if (str != null && str != "")
  98                                 AddProperty (Beagle.Property.NewKeyword ("exif:ApertureValue", str));
  99
 100                         str = exif.LookupFirstValue (ExifTag.FocalLength);
 101                         if (str != null && str != "")
 102                                 AddProperty (Beagle.Property.NewKeyword ("exif:FocalLength", str));
 103
 104                         str = exif.LookupFirstValue (ExifTag.Flash);
 105                         if (str != null && str != "")
 106                                 AddProperty (Beagle.Property.NewKeyword ("exif:Flash", str));
 107
 108                         str = exif.LookupFirstValue (ExifTag.Model);
 109                         if (str != null && str != "")
 110                                 AddProperty (Beagle.Property.NewKeyword ("exif:Model", str));
 111
 112                         str = exif.LookupFirstValue (ExifTag.Copyright);
 113                         if (str != null && str != "")
 114                                 AddProperty (Beagle.Property.New ("exif:Copyright", str));
 115
 116                         str = exif.LookupFirstValue (ExifTag.DateTime);
 117                         if (str != null && str != "") {
 118                                 try {
 119                                         DateTime dt = ExifUtil.DateTimeFromString (str);
 120                                         AddProperty (Beagle.Property.NewDate ("exif:DateTime", dt));
 121                                 } catch (ArgumentOutOfRangeException e) {
 122                                         Logger.Log.Debug("EXIF DateTime '{0}' is invalid.", str);
 123                                 }
 124                         }
 125
 126                         Finished (); // That's all folks...
 127                 }
 128         }
 129 }