/// <summary>
/// Attempts to extract the media properties of the main
/// photo.
/// </summary>
/// <returns>
/// A <see cref="Properties" /> object with a best effort guess
/// at the right values. When no guess at all can be made,
/// <see langword="null" /> is returned.
/// </returns>
private Properties ExtractProperties()
{
int width = 0, height = 0;
IFDTag tag = GetTag(TagTypes.TiffIFD) as IFDTag;
IFDStructure structure = tag.Structure;
width = (int)(structure.GetLongValue(0, 0x07) ?? 0);
height = (int)(structure.GetLongValue(0, 0x06) ?? 0);
var vendor = ImageTag.Make;
if (vendor == "LEICA")
{
vendor = "Leica";
}
var desc = String.Format("{0} RAW File", vendor);
if (width > 0 && height > 0)
{
return(new Properties(TimeSpan.Zero, new Codec(width, height, desc)));
}
return(null);
}
/// <summary>
/// Gets a tag of a specified type from the current instance,
/// optionally creating a new tag if possible.
/// </summary>
/// <param name="type">
/// A <see cref="TagLib.TagTypes" /> value indicating the
/// type of tag to read.
/// </param>
/// <param name="create">
/// A <see cref="bool" /> value specifying whether or not to
/// try and create the tag if one is not found.
/// </param>
/// <returns>
/// A <see cref="Tag" /> object containing the tag that was
/// found in or added to the current instance. If no
/// matching tag was found and none was created, <see
/// langword="null" /> is returned.
/// </returns>
public override Tag GetTag (TagTypes type, bool create)
{
Tag tag = base.GetTag (type, false);
if (tag != null) {
return tag;
}
if (!create || (type & ImageTag.AllowedTypes) == 0)
return null;
if (type != TagTypes.TiffIFD)
return base.GetTag (type, create);
ImageTag new_tag = new IFDTag (this);
ImageTag.AddTag (new_tag);
return new_tag;
}