[DaveBlake]

A good example that needs to be here from http://forum.kodi.tv/showthread.php?tid=251312
that shows the combining logic that filters on both AND and OR in GetAlbums

Code:

{"jsonrpc": "2.0", "method": "AudioLibrary.GetAlbums", "params": { "filter": {"and": [{"or": [{"field": "genre", "operator": "contains", "value": "jazz"}, {"field": "genre", "operator": "contains", "value": "blues"}, {"field": "genre", "operator": "contains", "value": "swing"}]}, {"and":[{"field": "year", "operator": "greaterthan", "value": "1959"}, {"field": "year", "operator": "lessthan", "value": "1970"}]}]},  "properties": ["albumlabel", "artist", "title", "year", "thumbnail"], "sort": { "order": "ascending", "method": "artist", "ignorearticle": true }}, "id": "libAlbums"}

Worth adding that only smart playlist rule type filters (like above) can be combined in this way. The ID filters for artistid or genreid e.g.

Code:

"filter": {"artistid":563}

or

Code:

"filter": {"genreid":6}

can not be combined. Nor can ID filters and rule filters be combined. If you filter with an ID then only one can be applied and nothing else.

This is true in GetAlbums, GetArtists and GetSongs and restricts the JSON filtering permitted compared to the flexibility of the Kodi UI which can, for example, filter songs by both genreid and artistid.