92 lines
3.3 KiB
C#
92 lines
3.3 KiB
C#
using MetadataExtractor;
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using MetadataExtractor.Formats.Exif;
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namespace GhostImageManager.Services;
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public class ExifData
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{
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public string? CameraMake { get; set; }
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public string? CameraModel { get; set; }
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public string? Lens { get; set; }
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public string? Aperture { get; set; }
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public string? ShutterSpeed { get; set; }
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public string? Iso { get; set; }
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public string? FocalLength { get; set; }
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public DateTime? CaptureDate { get; set; }
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}
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public class ExifService
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{
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private readonly ILogger<ExifService> _logger;
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public ExifService(ILogger<ExifService> logger)
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{
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_logger = logger;
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}
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public ExifData ExtractExifData(string filePath)
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{
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var result = new ExifData();
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try
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{
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if (!File.Exists(filePath))
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{
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_logger.LogWarning("EXIF-Extraktion: Datei nicht gefunden {FilePath}", filePath);
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return result;
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}
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var directories = ImageMetadataReader.ReadMetadata(filePath);
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var ifd0Directory = directories.OfType<ExifIfd0Directory>().FirstOrDefault();
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var subIfdDirectory = directories.OfType<ExifSubIfdDirectory>().FirstOrDefault();
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var exifDirectory = directories.OfType<ExifDirectoryBase>().FirstOrDefault();
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// Kamera
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if (ifd0Directory != null)
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{
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result.CameraMake = ifd0Directory.GetDescription(ExifDirectoryBase.TagMake);
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result.CameraModel = ifd0Directory.GetDescription(ExifDirectoryBase.TagModel);
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}
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// Aufnahmedatum
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if (exifDirectory != null && exifDirectory.TryGetDateTime(ExifDirectoryBase.TagDateTimeOriginal, out var captureDate))
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{
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result.CaptureDate = captureDate;
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}
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else if (exifDirectory != null && exifDirectory.TryGetDateTime(ExifDirectoryBase.TagDateTime, out var dateTime))
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{
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result.CaptureDate = dateTime;
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}
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if (subIfdDirectory != null)
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{
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// Blende
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result.Aperture = subIfdDirectory.GetDescription(ExifDirectoryBase.TagAperture);
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if (string.IsNullOrEmpty(result.Aperture))
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result.Aperture = subIfdDirectory.GetDescription(ExifDirectoryBase.TagFNumber);
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// Verschlusszeit
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result.ShutterSpeed = subIfdDirectory.GetDescription(ExifDirectoryBase.TagExposureTime);
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// ISO
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result.Iso = subIfdDirectory.GetDescription(ExifDirectoryBase.TagIsoEquivalent);
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// Brennweite
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result.FocalLength = subIfdDirectory.GetDescription(ExifDirectoryBase.TagFocalLength);
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// Objektiv
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result.Lens = subIfdDirectory.GetDescription(ExifDirectoryBase.TagLensModel);
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if (string.IsNullOrEmpty(result.Lens))
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result.Lens = subIfdDirectory.GetDescription(ExifDirectoryBase.TagLensSpecification);
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}
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_logger.LogDebug("EXIF-Daten für {File} extrahiert", Path.GetFileName(filePath));
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "Fehler beim Extrahieren der EXIF-Daten für {FilePath}", filePath);
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}
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return result;
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}
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}
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