gerbera 2.0 - upnp container sort about gerbera

[KarlStraussberger]

It depends on the upnp_class. Sorting is by upnp_class the by name to have generic containers at the top. If you use the same class everywhere, it should be fine.

[nobanzai]

Did the behaviour change in gerbera 2.0? Because I didn't change anything in my addAudio script and the config file regarding upnp-classes. Before everything was sorted alphabetically.

[KarlStraussberger]

Yes, there was a change to take class into account.

[nobanzai]

I use

audio: { title: 'Audio', objectType: OBJECT_TYPE_CONTAINER, upnpclass: UPNP_CLASS_CONTAINER, metaData: [] },
artist: { title: artist[0], objectType: OBJECT_TYPE_CONTAINER, upnpclass: UPNP_CLASS_CONTAINER_MUSIC_ARTIST, metaData: [], res: obj.res, aux: obj.aux, refID: obj.id },
allArtists: { title: '01 - Artists (all)', objectType: OBJECT_TYPE_CONTAINER, upnpclass: UPNP_CLASS_CONTAINER },
albumartist: { title: albumartist, objectType: OBJECT_TYPE_CONTAINER, upnpclass: UPNP_CLASS_CONTAINER_MUSIC_ARTIST, metaData: [], res: obj.res, aux: obj.aux, refID: obj.id },
allAlbumArtists: { title: '02 - Album Artists (all)', objectType: OBJECT_TYPE_CONTAINER, upnpclass: UPNP_CLASS_CONTAINER },

What should I use instead?

[nobanzai]

Ok, got it - using upnpclass: UPNP_CLASS_CONTAINER for all containers gives the desired results.
Is there a description for the existing upnp container classes, i.e. UPNP_CLASS_CONTAINER_MUSIC_ARTIST et al?

[KarlStraussberger]

https://docs.gerbera.io/en/stable/scripting.html#constants

[nobanzai]

Thx, but then I don't understand the sort behaviour for UPNP_CLASS_CONTAINER_MUSIC_ARTIST mixed with UPNP_CLASS_CONTAINER containers - there is no special treatment for both classes, but containers of these classes aren't sorted alphabetically among each other? Instead all UPNP_CLASS_CONTAINER containers are sorted alphabetically and then all UPNP_CLASS_CONTAINER_MUSIC_ARTIST containers?
Looks like this:

[KarlStraussberger]

As said, the sorting is upnp_class, title which means that all UPNP_CLASS_CONTAINER are forming a group and all item in this group are sorted by title. The same with UPNP_CLASS_CONTAINER_MUSIC_ARTIST.

The group object.container is put before object.container.person.musicArtist. Try to add these in some spreadsheet and sort by the two columns.

[nobanzai]

Ah, no I didn't really understand that before, but of course then this sort order is absolutly clear.
One more question: Do I have any advantage using these classes besides the sort order?

[KarlStraussberger]

Support for container and file types is depending on the client, that's why we try to be exact. upnp:class is a more sophisticated concept than file extensions from desktop systems.

[nobanzai]

Not sure, if I understand, why upnp:class is more sophisticated, and what I can do with this sophistication. Can you elaborate, please?

[KarlStraussberger]

File systems typically distinguish files and folders. UPnP defines multiple subtypes and clients may support these.

• album folders show cover art and release date
• genre/artist folders show up in genre/artist search
• video files are not shown on audio players
  And so on...

[nobanzai]

Thx again!