aves internal mediascanner for jpg files: Try to harvest tags, title, description, geo, date from multible sources

[k3b]

I have nearly 22000 jpg photos in 800 folders/albums on my phone and on my tablet.

Many of them have meta data tags, title, description, geo, date in different exif/iptc/xmp fields.

Example:

Some Photos got their "tags" in the microsoft-windows-explorer that were stored in Exif.XPKEYWORDS, other use xmp.Tags or the standard Iptc.KEYWORDS.

It would be great if the aves-media scaner tries to harvest it-s properties from different sources (exif/iptc/xmp)
Example: If tags are not found in Iptc.KEYWORDS try to get them from xmp.Tags and if not found get them from Exif.XPKEYWORDS

In my not-maintained-anymore-app aPhotoManger i used these (taken from https://github.com/k3b/APhotoManager/wiki/Metadata#mapping under de.k3b.media.PhotoPropertiesImageReader)

de.k3b.media.PhotoPropertiesImageReader

property	#1	#2	#3	#4	#5	#6	#7	#8	#9
DateTimeTaken	ExifSubIFD.DATETIME_ORIGINAL	ExternalXmp.DateTimeTaken	InternalXmp.DateTimeTaken
Latitude	ExifGps.Latitude	ExternalXmp.Latitude	InternalXmp.Latitude
Longitude	ExifGps.Longitude	ExternalXmp.Longitude	InternalXmp.Longitude
Title	ExternalXmp.Title	Exif.XPTITLE	IptcDirectory.TAG_HEADLINE	InternalXmp.Title
Description	Exif.IMAGE_DESCRIPTION	ExternalXmp.Description	Exif.XPCOMMENT	Exif.USER_COMMENT	JpegComment.COMMENT	InternalXmp.Description	Iptc.CAPTION
Tags	ExternalXmp.Tags	Exif.XPKEYWORDS	Iptc.KEYWORDS	InternalXmp.Tags
Visibility	Exif.XPKEYWORDS(PRIVATE)	ExternalXmp.apm.Visibility	InternalXmp.apm.Visibility
Rating	ExternalXmp.Rating	Exif.RATING	InternalXmp.Rating

• internalXmp means xmp embedded inside the jpg file
• externalXmp means external xmp sidecar file

Related tickets:

• Creation Time / Date not in metadata-format that can be read by other devices #1063
• Fallback for when setting a tag natively fails #1212

[deckerst]

aves/android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/MetadataFetchHandler.kt

Line 500 in 1864f77

// set `KEY_DATE_MILLIS` from these fields (by precedence):

aves/android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/MetadataFetchHandler.kt

Line 957 in 1864f77

// return description from these fields (by precedence):

• Date (by precedence):

  • Exif / DATETIME_ORIGINAL
  • Exif / DATETIME
  • XMP / xmp:CreateDate
  • XMP / photoshop:DateCreated
  • PNG / TIME / LAST_MODIFICATION_TIME
  • Video / METADATA_KEY_DATE

• Title (by precedence):

  • XMP / dc:title
  • IPTC / object-name

• Description (by precedence):

  • XMP / dc:description
  • IPTC / caption-abstract
  • Exif / UserComment
  • Exif / ImageDescription

• Tags (by precedence):

  • XMP / dc:subject
  • IPTC / keywords

• Rating (by precedence):

  • XMP / xmp:Rating
  • XMP / MicrosoftPhoto:Rating