///<summary>Get when a video file was taken.</summary>
///<returns>True if this file had data.</returns>
private static bool GetVideoDateTaken(string path, out DateTime dateTaken, out DateTakenSrc src)
{
dateTaken = DateTime.Now;
src = DateTakenSrc.Now;
try
{
IEnumerable <MetadataExtractor.Directory> directories = QuickTimeMetadataReader.ReadMetadata(new FileStream(path, FileMode.Open));
QuickTimeMovieHeaderDirectory directory = directories.OfType <QuickTimeMovieHeaderDirectory>().FirstOrDefault();
if (directory != null && directory.TryGetDateTime(QuickTimeMovieHeaderDirectory.TagCreated, out dateTaken))
{
src = DateTakenSrc.Metadata;
return(true);
}
}
catch (Exception)
{
src = DateTakenSrc.Now;
bool hasData = GetFilenameTimestamp(Path.GetFileName(path), out dateTaken, out src);
if (hasData)
{
return(true);
}
dateTaken = DateTime.Now;
src = DateTakenSrc.Now;
return(false);
}
return(false);
}
//Try and examine metadata. If necessary, it analyzes filename. If can't find data in either, default to DateTime.Now.
//Returns true if had metadata.
private static bool GetImgDateTaken(string path, out DateTime dateTaken, out DateTakenSrc src)
{
bool hasData;
try
{
ExifReader reader = new(path);
//I think if this ↓ returns false it means no data found. 0 documentation on this...
hasData = reader.GetTagValue(ExifTags.DateTimeDigitized, out dateTaken);
if (dateTaken == DateTime.MinValue || hasData == false)
{
throw new ExifLibException(); //If GetTagValue returns DateTime.MinValue, means no data found (hasData == false means same thing), so try reading filename instead.
}
src = DateTakenSrc.Metadata;
}
catch (ExifLibException) //No metadata in file.
{
hasData = GetFilenameTimestamp(Path.GetFileName(path), out dateTaken, out src);
if (!hasData)
{
dateTaken = DateTime.Now;
}
}
return(hasData);
}
//Get the Date Taken for an item, if possible.
//Return true if date taken was found either in the metadata or filename, or false if using DateTime.Now
public static bool GetDateTaken(string path, out DateTime dateTaken, out DateTakenSrc dateTakenSrc)
{
dateTaken = DateTime.Now;
dateTakenSrc = DateTakenSrc.Now;
string ext = Path.GetExtension(path).ToLower(); //Some files might have extension in all caps for no reason.
bool hasData = ext switch
{
".jpg" or ".jpeg" or ".png" or ".gif" => GetImgDateTaken(path, out dateTaken, out dateTakenSrc),
".mp4" or ".mkv" or ".mov" => GetVideoDateTaken(path, out dateTaken, out dateTakenSrc),
_ => false
};
return(hasData);
}
//Used if program can't find date/time metadata in the file. Often, filenames will have a timestamp in them.
//E.g., the Nintendo Switch generates pics/vids filenames like: 2018022016403700_s.mp4. This can be stripped and
//converted into an actual DateTime object.
private static bool GetFilenameTimestamp(string filename, out DateTime dateTaken, out DateTakenSrc src)
{
bool hasData;
string timestamp = ""; //The actual timestamp in the filename, without the extra chars we don't want. Converted to DateTime at the end.
try
{
if (filename.StartsWith("Screenshot_")) //If Android screenshot. E.g., 'Screenshot_20201028-141626_Messages.jpg'
{
timestamp = filename.Substring(11, 8) + filename.Substring(20, 6); //Strip the chars we don't want.
}
else if (filename.StartsWith("IMG_") || filename.StartsWith("VID_"))
{
timestamp = filename.Substring(4, 8) + filename.Substring(13, 6);
}
else if (filename[4] == '-' && filename[13] == '-' && filename[16] == '-' && filename.EndsWith(".mkv")) //Check if an OBS-generated file. It would have '-' at these 3 indices.
{
timestamp = filename;
timestamp = filename[..(timestamp.Length - 4)]; //Remove extension https://stackoverflow.com/questions/15564944/remove-the-last-three-characters-from-a-string