private static string GetColorClassString(Directory exifItem)
{
var colorClassSting = string.Empty;
var ratingCounts = exifItem.Tags.Count(p => p.DirectoryName == "IPTC" && p.Name.Contains("0x02dd"));
if (ratingCounts >= 1)
{
var prefsTag = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "IPTC" && p.Name.Contains("0x02dd"))?.Description;
// Results for example
// 0:1:0:-00001
// ~~~~~~
// 0:8:0:-00001
if (!string.IsNullOrWhiteSpace(prefsTag))
{
var prefsTagSplit = prefsTag.Split(":".ToCharArray());
colorClassSting = prefsTagSplit[1];
}
return(colorClassSting);
}
// Xmp readings
colorClassSting = GetXmpData(exifItem, "photomechanic:ColorClass");
return(colorClassSting);
}
/// <summary>
/// [Exif SubIFD] Shutter Speed Value = 1/2403 sec
/// </summary>
/// <param name="exifItem">item to look in</param>
/// <returns>value</returns>
private static string GetShutterSpeedValue(Directory exifItem)
{
var shutterSpeedString = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Exif SubIFD" && p.Name == "Shutter Speed Value")?.Description;
if (string.IsNullOrEmpty(shutterSpeedString))
{
shutterSpeedString = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Exif SubIFD" && p.Name == "Exposure Time")?.Description;
}
// XMP,http://ns.adobe.com/exif/1.0/,exif:ExposureTime,1/20
var exposureTimeXmp = GetXmpData(exifItem, "exif:ExposureTime");
if (string.IsNullOrEmpty(shutterSpeedString) && !string.IsNullOrEmpty(exposureTimeXmp) && exposureTimeXmp.Length <= 20)
{
return(exposureTimeXmp);
}
if (shutterSpeedString == null)
{
return(string.Empty);
}
// the database has a 20 char limit
if (shutterSpeedString.Length >= 20)
{
return(string.Empty);
}
// in xmp there is only a field with for example: 1/33
shutterSpeedString = shutterSpeedString.Replace(" sec", string.Empty);
return(shutterSpeedString);
}
/// <summary>
/// [Exif SubIFD] Focal Length
/// </summary>
/// <returns></returns>
private static double GetFocalLength(Directory exifItem)
{
var focalLengthString = exifItem.Tags.FirstOrDefault(
p => p.DirectoryName == "Exif SubIFD" &&
p.Name == "Focal Length")?.Description;
// XMP,http://ns.adobe.com/exif/1.0/,exif:FocalLength,11/1
var focalLengthXmp = GetXmpData(exifItem, "exif:FocalLength");
if (string.IsNullOrEmpty(focalLengthString) && !string.IsNullOrEmpty(focalLengthXmp))
{
return(Math.Round(MathFraction.Fraction(focalLengthXmp), 5));
}
if (string.IsNullOrWhiteSpace(focalLengthString))
{
return(0d);
}
focalLengthString = focalLengthString.Replace(" mm", string.Empty);
// Note: focalLengthString: (Dutch) 2,2 or (English) 2.2 based CultureInfo.CurrentCulture
float.TryParse(focalLengthString, NumberStyles.Number, CultureInfo.CurrentCulture, out var focalLength);
return(Math.Round(focalLength, 5));
}
private static double GetAperture(Directory exifItem)
{
var apertureString = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Exif SubIFD" && p.Name == "Aperture Value")?.Description;
if (string.IsNullOrEmpty(apertureString))
{
apertureString = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Exif SubIFD" && p.Name == "F-Number")?.Description;
}
// XMP,http://ns.adobe.com/exif/1.0/,exif:FNumber,9/1
var fNumberXmp = GetXmpData(exifItem, "exif:FNumber");
if (string.IsNullOrEmpty(apertureString) && !string.IsNullOrEmpty(fNumberXmp))
{
return(MathFraction.Fraction(fNumberXmp));
}
if (apertureString == null)
{
return(0d);
}
apertureString = apertureString.Replace("f/", string.Empty);
// Note: apertureString: (Dutch) 2,2 or (English) 2.2 based CultureInfo.CurrentCulture
float.TryParse(apertureString, NumberStyles.Number, CultureInfo.CurrentCulture, out var aperture);
return(aperture);
}
private void AddDates(MetadataExtractor.Directory xmpData, Photo photo)
{
var xmpDirectory = xmpData as XmpDirectory;
var dateCreated = xmpDirectory.XmpMeta.Properties.SingleOrDefault(p => p.Path == "xmp:CreateDate");
var photoshopDateCreated = xmpDirectory.XmpMeta.Properties.SingleOrDefault(p => p.Path == "photoshop:DateCreated");
var dateModified = xmpDirectory.XmpMeta.Properties.SingleOrDefault(p => p.Path == "xmp:ModifyDate");
if (!String.IsNullOrWhiteSpace(dateCreated?.Value))
{
if (DateTime.TryParse(dateCreated.Value, out DateTime takenDate))
{
photo.TakenDate = takenDate;
}
}
if (!photo.TakenDate.HasValue && !String.IsNullOrWhiteSpace(photoshopDateCreated?.Value))
{
if (DateTime.TryParse(photoshopDateCreated.Value, out DateTime photoshopTakenDate))
{
photo.TakenDate = photoshopTakenDate;
}
}
if (!String.IsNullOrWhiteSpace(dateModified?.Value))
{
if (DateTime.TryParse(dateCreated.Value, out DateTime modifiedDate))
{
photo.ModifiedDate = modifiedDate;
}
}
}
public static FileIndexItem.Rotation GetOrientationFromExifItem(Directory exifItem)
{
var tCounts = exifItem.Tags.Count(p => p.DirectoryName == "Exif IFD0" && p.Name == "Orientation");
if (tCounts < 1)
{
return(FileIndexItem.Rotation.DoNotChange);
}
var caption = exifItem.Tags.FirstOrDefault(
p => p.DirectoryName == "Exif IFD0" &&
p.Name == "Orientation")?.Description;
// Not unit tested :(
switch (caption)
{
case "Top, left side (Horizontal / normal)":
return(FileIndexItem.Rotation.Horizontal);
case "Right side, top (Rotate 90 CW)":
return(FileIndexItem.Rotation.Rotate90Cw);
case "Bottom, right side (Rotate 180)":
return(FileIndexItem.Rotation.Rotate180);
case "Left side, bottom (Rotate 270 CW)":
return(FileIndexItem.Rotation.Rotate270Cw);
default:
return(FileIndexItem.Rotation.Horizontal);
}
}
/// <summary>
/// [Exif SubIFD] Lens Model = E 18-200mm F3.5-6.3 OSS LE
/// </summary>
/// <param name="exifItem"></param>
/// <returns></returns>
private static string GetMakeLensModel(Directory exifItem)
{
var lensModel = exifItem.Tags.FirstOrDefault(
p => p.DirectoryName == "Exif SubIFD" &&
p.Name == "Lens Model")?.Description;
return(lensModel == "----" ? string.Empty : lensModel);
}
private void AddMetadataLabel(List <string> labels, MetadataExtractor.Directory exifDir, string tagName)
{
var tag = exifDir.Tags.SingleOrDefault(t => t.Name == tagName);
if (!string.IsNullOrWhiteSpace(tag?.Description))
{
labels.Add(tag.Description);
}
}
private void AddExifDates(MetadataExtractor.Directory directory, Photo photo)
{
var tag = directory.Tags.SingleOrDefault(t => t.Name == "Date/Time");
if (!string.IsNullOrWhiteSpace(tag?.Description) && DateTime.TryParse(tag.Description, out DateTime creationDate))
{
photo.TakenDate = creationDate;
}
}
/// <summary>
/// Extract exif data from picture directories.
/// </summary>
/// <param name="pictureDirectory"></param>
/// <param name="pictureExiftag"></param>
/// <returns></returns>
public string GetExifData(MetadataExtractor.Directory pictureDirectory, int pictureExiftag)
{
var exifData = pictureDirectory?.GetDescription(pictureExiftag);
var pictureExifData = (!string.IsNullOrEmpty(exifData)) ?
(pictureExifMetaData.SpaceTabulation + exifData) :
pictureExifMetaData.TabEmpty;
return(pictureExifData);
}
private void AddLabelFromXmpDescription(List <string> labels, MetadataExtractor.Directory xmpData)
{
var xmpDirectory = xmpData as XmpDirectory;
var artworkDesc = xmpDirectory.XmpMeta.Properties.SingleOrDefault(p => p.Path == "Iptc4xmpExt:ArtworkContentDescription");
if (artworkDesc != null)
{
labels.Add(artworkDesc.Value);
}
}
private static string GetXmpData(Directory exifItem, string propertyPath)
{
// for xmp notes
if (!(exifItem is XmpDirectory xmpDirectory) || xmpDirectory.XmpMeta == null)
{
return(string.Empty);
}
return((from property in xmpDirectory.XmpMeta.Properties.Where(p => !string.IsNullOrEmpty(p.Value))
where property.Path == propertyPath select property.Value).FirstOrDefault());
}
private static string ParseString(Directory subIfd, int tag)
{
var stringValue = subIfd.GetStringValue(tag);
if (stringValue.Bytes != null)
{
return(stringValue.ToString());
}
return(null);
}
private static T?ParseRational <T>(Directory directory, int tag, Func <double, T> convert) where T : struct
{
if (directory.TryGetRational(tag, out var rational))
{
var orig = (rational.Numerator / (double)rational.Denominator);
// var boxed = (object) orig;
return(convert(orig));
}
return(null);
}
/// <summary>
/// Copmare if two exif tags has the same value
/// </summary>
/// <param name="tag"></param>
/// <param name="subDir1"></param>
/// <param name="subDif2"></param>
/// <returns>true if not null and has the same value</returns>
private static bool CompareDir(int tag, MetadataExtractor.Directory subDir1, MetadataExtractor.Directory subDif2)
{
var width1 = subDir1?.GetDescription(tag);
var width2 = subDif2?.GetDescription(tag);
if (width1 == null && width2 == null)
{
return(true);
}
return(width1 != null && width1.Equals(width2));
}
/// <summary>
/// Extracts all tags with names matching the filter from the directory and returns an enumerable of those tags.
/// </summary>
private static IEnumerable <Tag> ExtractDirectoryTags(MetadataExtractor.Directory dir, Func <Tag, bool> filter)
{
List <Tag> tags = new List <Tag>();
foreach (Tag t in dir.Tags)
{
if (filter(t))
{
tags.Add(t);
}
}
return(tags);
}
private static DateTime?ParseDateTime(Directory gpsDirectory, DateTimeStyles dateTimeStyles)
{
var timeStamp = gpsDirectory.GetRationalArray(GpsDirectory.TagTimeStamp);
var dateStamp = gpsDirectory.GetString(GpsDirectory.TagDateStamp);
if (timeStamp == null || dateStamp == null)
{
return(null);
}
var hour = ParseRational(timeStamp[0], Convert.ToInt32);
var minute = ParseRational(timeStamp[1], Convert.ToInt32);
var second = ParseRational(timeStamp[2], Convert.ToInt32);
private static int?GetOrientation(Directory directory)
{
try
{
return(directory?.GetInt32(ExifDirectoryBase.TagOrientation));
}
catch (Exception)
{
// ignored
}
return(null);
}
private void AddQuickTimeMetaCreationDate(MetadataExtractor.Directory quickTimeMeta, Photo photo)
{
var tag = quickTimeMeta.Tags.SingleOrDefault(t => t.Name == QuickTimeMetaDataCreationDateTag);
if (tag != null)
{
var tagValue = (StringValue)quickTimeMeta.GetObject(tag.Type);
if (DateTime.TryParse(tagValue.ToString(), out DateTime creationDate))
{
photo.TakenDate = creationDate;
}
}
}
private static void AddQuickTimeMetaCreationDate(MetadataExtractor.Directory quickTimeMeta, Photo photo)
{
var tag = quickTimeMeta.Tags.SingleOrDefault(t => t.Name == "mdta.com.apple.quicktime.creationdate");
if (tag != null)
{
var tagValue = quickTimeMeta.GetObject(tag.Type) as QuickTimeMetadataValue;
if (DateTime.TryParse(tagValue.Value, out DateTime creationDate))
{
photo.TakenDate = creationDate;
}
}
}
/// <summary>
/// For the location element
/// [IPTC] City = Diepenveen
/// [IPTC] Province/State = Overijssel
/// [IPTC] Country/Primary Location Name = Nederland
/// </summary>
/// <param name="exifItem"></param>
/// <param name="iptcName">City, State or Country</param>
/// <param name="xmpPropertyPath">photoshop:State</param>
/// <returns></returns>
private static string GetLocationPlaces(Directory exifItem, string iptcName, string xmpPropertyPath)
{
var tCounts = exifItem.Tags.Count(p => p.DirectoryName == "IPTC" && p.Name == iptcName);
if (tCounts < 1)
{
return(GetXmpData(exifItem, xmpPropertyPath));
}
var locationCity = exifItem.Tags.FirstOrDefault(
p => p.DirectoryName == "IPTC" &&
p.Name == iptcName)?.Description;
return(locationCity);
}
public static string GetCaptionAbstract(Directory exifItem)
{
var tCounts = exifItem.Tags.Count(p => p.DirectoryName == "IPTC" && p.Name == "Caption/Abstract");
// Xmp readings
if (tCounts == 0)
{
return(GetXmpData(exifItem, "dc:description[1]"));
}
var caption = exifItem.Tags.FirstOrDefault(
p => p.DirectoryName == "IPTC" &&
p.Name == "Caption/Abstract")?.Description;
return(caption);
}
private static int?GetHeight(Directory directory)
{
int[] tags = { ExifDirectoryBase.TagImageHeight, ExifDirectoryBase.TagExifImageHeight };
foreach (var tag in tags)
{
try
{
return(directory?.GetInt32(tag));
}
catch (Exception)
{
// ignored
}
}
return(null);
}
/// <summary>
/// Read "dc:subject" values from XMP
/// </summary>
/// <param name="exifItem">item</param>
/// <returns></returns>
private static string GetXmpDataSubject(Directory exifItem) //
{
if (!(exifItem is XmpDirectory xmpDirectory) || xmpDirectory.XmpMeta == null)
{
return(string.Empty);
}
var tagsList = new HashSet <string>();
foreach (var property in xmpDirectory.XmpMeta.Properties.Where(p => !string.IsNullOrEmpty(p.Value)))
{
if (property.Path.StartsWith("dc:subject["))
{
tagsList.Add(property.Value);
}
}
return(HashSetHelper.HashSetToString(tagsList));
}
private static int GetImageSizeInsideLoop(Directory exifItem, string dirName, string typeName)
{
var ratingCountsJpeg =
exifItem.Tags.Count(p => p.DirectoryName == dirName &&
p.Name.Contains(typeName) && p.Description != "0");
if (ratingCountsJpeg >= 1)
{
var widthTag = exifItem.Tags
.FirstOrDefault(p => p.DirectoryName == dirName &&
p.Name.Contains(typeName) && p.Description != "0")
?.Description;
widthTag = widthTag?.Replace(" pixels", string.Empty);
int.TryParse(widthTag, out var widthInt);
return(widthInt >= 1 ? widthInt : 0); // (widthInt >= 1) return widthInt)
}
return(0);
}
public static string GetExifKeywords(Directory exifItem)
{
var tCounts = exifItem.Tags.Count(p => p.DirectoryName == "IPTC" && p.Name == "Keywords");
if (tCounts == 0)
{
return(GetXmpDataSubject(exifItem));
}
var tags = exifItem.Tags.FirstOrDefault(
p => p.DirectoryName == "IPTC" &&
p.Name == "Keywords")?.Description;
if (!string.IsNullOrWhiteSpace(tags))
{
tags = tags.Replace(";", ", ");
}
return(tags);
}
private void AddGpsMeta(Photo photo, MetadataExtractor.Directory gpsMeta)
{
var latitudeTag = gpsMeta.Tags.SingleOrDefault(t => t.Name == "GPS Latitude");
var longitudeTag = gpsMeta.Tags.SingleOrDefault(t => t.Name == "GPS Longitude");
var altitudeTag = gpsMeta.Tags.SingleOrDefault(t => t.Name == "GPS Altitude");
if (latitudeTag != null)
{
photo.Latitude = GetCoordinateFromDegrees(latitudeTag);
}
if (longitudeTag != null)
{
photo.Longitude = GetCoordinateFromDegrees(longitudeTag);
}
if (altitudeTag != null)
{
photo.Altitude = altitudeTag.Description;
}
}
private static int GetIsoSpeedValue(Directory exifItem)
{
var isoSpeedString = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Exif SubIFD" && p.Name == "ISO Speed Ratings")?.Description;
if (string.IsNullOrEmpty(isoSpeedString))
{
isoSpeedString = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Canon Makernote" && p.Name == "Iso")?.Description;
if (isoSpeedString == "Auto")
{
// src: https://github.com/exiftool/exiftool/blob/
// 6b994069d52302062b9d7a462dc27082c4196d95/lib/Image/ExifTool/Canon.pm#L8882
var autoIso = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Canon Makernote" && p.Name == "Auto ISO")?.Description;
var baseIso = exifItem.Tags.FirstOrDefault(p =>
p.DirectoryName == "Canon Makernote" && p.Name == "Base ISO")?.Description;
if (!string.IsNullOrEmpty(autoIso) && !string.IsNullOrEmpty(baseIso))
{
int.TryParse(autoIso, NumberStyles.Number, CultureInfo.InvariantCulture, out var autoIsoSpeed);
int.TryParse(baseIso, NumberStyles.Number, CultureInfo.InvariantCulture, out var baseIsoSpeed);
return(baseIsoSpeed * autoIsoSpeed / 100);
}
}
}
// XMP,http://ns.adobe.com/exif/1.0/,exif:ISOSpeedRatings,
// XMP,,exif:ISOSpeedRatings[1],101
// XMP,,exif:ISOSpeedRatings[2],101
var isoSpeedXmp = GetXmpData(exifItem, "exif:ISOSpeedRatings[1]");
if (string.IsNullOrEmpty(isoSpeedString) && !string.IsNullOrEmpty(isoSpeedXmp))
{
isoSpeedString = isoSpeedXmp;
}
int.TryParse(isoSpeedString, NumberStyles.Number, CultureInfo.InvariantCulture, out var isoSpeed);
return(isoSpeed);
}
/// <summary>
/// Requires exifDirectory is an actual metadata exif directory.
/// Attempts to return the tags that have 'date' in their names
/// </summary>
private static IEnumerable <Tag> ExtractExIfDateTags(MetadataExtractor.Directory exifDirectory)
{
return(ExtractDirectoryTags(exifDirectory, n => { return n.Name.ToLower().Contains("date"); }));
}
public Tag(int tagType, [NotNull] Directory directory)
{
TagType = tagType;
_directory = directory;
}
private static int?ParseInt(Directory directory, int tag)
{
return(directory.TryGetInt32(tag, out var intValue) ? intValue : (int?)null);
}
