Merge pull request #164 from dweymouth/refactor/generic-server-adapter

Prepare for eventual Jellyfin integration: create a generic MediaProvider model + interface

backend/app.go

@@ -25,7 +25,6 @@ type App struct {
 	Config          *Config
 	ServerManager   *ServerManager
 	ImageManager    *ImageManager
-	LibraryManager  *LibraryManager
 	PlaybackManager *PlaybackManager
 	Player          *player.Player
 	UpdateChecker   UpdateChecker
@@ -63,11 +62,10 @@ func StartupApp(appName, appVersionTag, configFile, latestReleaseURL string) (*A
 
 	a.ServerManager = NewServerManager(appName)
 	a.PlaybackManager = NewPlaybackManager(a.bgrndCtx, a.ServerManager, a.Player, &a.Config.Scrobbling)
-	a.LibraryManager = NewLibraryManager(a.ServerManager)
 	a.ImageManager = NewImageManager(a.bgrndCtx, a.ServerManager, configdir.LocalCache(a.appName))
-	a.LibraryManager.PreCacheCoverFn = func(coverID string) {
+	a.ServerManager.SetPrefetchAlbumCoverCallback(func(coverID string) {
 		_, _ = a.ImageManager.GetCoverThumbnail(coverID)
-	}
+	})
 
 	return a, nil
 }

backend/config.go

@@ -124,7 +124,7 @@ func DefaultConfig(appVersionTag string) *Config {
 			TracklistColumns: []string{"Artist", "Time", "Plays", "Favorite", "Rating"},
 		},
 		AlbumsPage: AlbumsPageConfig{
-			SortOrder: string(AlbumSortRecentlyAdded),
+			SortOrder: string("Recently Added"),
 		},
 		ArtistPage: ArtistPageConfig{
 			InitialView:      "Discography",

backend/imagemanager.go

@@ -18,6 +18,8 @@ import (
 
 const CachedImageValidTime = 24 * time.Hour
 
+const coverArtThumbnailSize = 300
+
 type ImageManager struct {
 	s              *ServerManager
 	baseCacheDir   string
@@ -72,7 +74,7 @@ func (i *ImageManager) GetFullSizeCoverArt(coverID string) (image.Image, error)
 	if i.cachedFullSizeCoverID == coverID {
 		return i.cachedFullSizeCover, nil
 	}
-	im, err := i.s.Server.GetCoverArt(coverID, nil)
+	im, err := i.s.Server.GetCoverArt(coverID, 0)
 	if err != nil {
 		return nil, err
 	}
@@ -143,7 +145,7 @@ func (i *ImageManager) fetchAndCacheCoverFromDiskOrServer(coverID string, ttl ti
 }
 
 func (i *ImageManager) fetchAndCacheCoverFromServer(coverID string, ttl time.Duration) (image.Image, error) {
-	img, err := i.s.Server.GetCoverArt(coverID, map[string]string{"size": "300"})
+	img, err := i.s.Server.GetCoverArt(coverID, coverArtThumbnailSize)
 	if err != nil {
 		return nil, err
 	}

backend/librarymanager.go

@@ -1,39 +0,0 @@
-package backend
-
-import (
-	subsonic "github.com/dweymouth/go-subsonic/subsonic"
-)
-
-type AlbumIterator interface {
-	Next() *subsonic.AlbumID3
-}
-
-type TrackIterator interface {
-	Next() *subsonic.Child
-}
-
-type LibraryManager struct {
-	PreCacheCoverFn func(coverID string)
-
-	s *ServerManager
-}
-
-func NewLibraryManager(s *ServerManager) *LibraryManager {
-	return &LibraryManager{
-		s: s,
-	}
-}
-
-func (l *LibraryManager) GetUserOwnedPlaylists() ([]*subsonic.Playlist, error) {
-	pl, err := l.s.Server.GetPlaylists(nil)
-	userPl := make([]*subsonic.Playlist, 0)
-	if err != nil {
-		return nil, err
-	}
-	for _, p := range pl {
-		if p.Owner == l.s.Server.User {
-			userPl = append(userPl, p)
-		}
-	}
-	return userPl, nil
-}

backend/mediaprovider/mediaprovider.go

@@ -0,0 +1,86 @@
+package mediaprovider
+
+import "image"
+
+type AlbumFilter struct {
+	MinYear int
+	MaxYear int      // 0 == unset/match any
+	Genres  []string // len(0) == unset/match any
+
+	ExcludeFavorited   bool // mut. exc. with ExcludeUnfavorited
+	ExcludeUnfavorited bool // mut. exc. with ExcludeFavorited
+}
+
+type AlbumIterator interface {
+	Next() *Album
+}
+
+type TrackIterator interface {
+	Next() *Track
+}
+
+type RatingFavoriteParameters struct {
+	AlbumIDs  []string
+	ArtistIDs []string
+	TrackIDs  []string
+}
+
+type Favorites struct {
+	Albums  []*Album
+	Artists []*Artist
+	Tracks  []*Track
+}
+
+type MediaProvider interface {
+	SetPrefetchCoverCallback(cb func(coverArtID string))
+
+	GetAlbum(albumID string) (*AlbumWithTracks, error)
+
+	GetArtist(artistID string) (*ArtistWithAlbums, error)
+
+	GetArtistInfo(artistID string) (*ArtistInfo, error)
+
+	GetPlaylist(playlistID string) (*PlaylistWithTracks, error)
+
+	GetCoverArt(coverArtID string, size int) (image.Image, error)
+
+	AlbumSortOrders() []string
+
+	IterateAlbums(sortOrder string, filter AlbumFilter) AlbumIterator
+
+	IterateTracks(searchQuery string) TrackIterator
+
+	SearchAlbums(searchQuery string, filter AlbumFilter) AlbumIterator
+
+	GetRandomTracks(genre string, count int) ([]*Track, error)
+
+	GetSimilarTracks(artistID string, count int) ([]*Track, error)
+
+	GetArtists() ([]*Artist, error)
+
+	GetGenres() ([]*Genre, error)
+
+	GetFavorites() (Favorites, error)
+
+	GetStreamURL(trackID string) (string, error)
+
+	GetTopTracks(artist Artist, count int) ([]*Track, error)
+
+	SetFavorite(params RatingFavoriteParameters, favorite bool) error
+
+	SetRating(params RatingFavoriteParameters, rating int) error
+
+	GetPlaylists() ([]*Playlist, error)
+
+	CreatePlaylist(name string, trackIDs []string) error
+
+	EditPlaylist(id, name, description string, public bool) error
+
+	EditPlaylistTracks(id string, trackIDsToAdd []string, trackIndexesToRemove []int) error
+
+	ReplacePlaylistTracks(id string, trackIDs []string) error
+
+	DeletePlaylist(id string) error
+
+	Scrobble(trackID string, submission bool) error
+}

backend/mediaprovider/model.go

@@ -0,0 +1,82 @@
+package mediaprovider
+
+type Album struct {
+	ID          string
+	CoverArtID  string
+	Name        string
+	Duration    int
+	ArtistIDs   []string
+	ArtistNames []string
+	Year        int
+	Genres      []string
+	TrackCount  int
+	Favorite    bool
+}
+
+type AlbumWithTracks struct {
+	Album
+	Tracks []*Track
+}
+
+type Artist struct {
+	ID         string
+	Name       string
+	Favorite   bool
+	AlbumCount int
+}
+
+type ArtistWithAlbums struct {
+	Artist
+	Albums []*Album
+}
+
+type ArtistInfo struct {
+	Biography      string
+	LastFMUrl      string
+	ImageURL       string
+	SimilarArtists []*Artist
+}
+
+type Genre struct {
+	Name       string
+	AlbumCount int
+	TrackCount int
+}
+
+type Track struct {
+	ID          string
+	CoverArtID  string
+	ParentID    string
+	Name        string
+	Duration    int
+	TrackNumber int
+	DiscNumber  int
+	Genre       string
+	ArtistIDs   []string
+	ArtistNames []string
+	Album       string
+	AlbumID     string
+	Year        int
+	Rating      int
+	Favorite    bool
+	Size        int64
+	PlayCount   int
+	FilePath    string
+	BitRate     int
+}
+
+type Playlist struct {
+	ID          string
+	CoverArtID  string
+	Name        string
+	Description string
+	Public      bool
+	Owner       string
+	Duration    int
+	TrackCount  int
+}
+
+type PlaylistWithTracks struct {
+	Playlist
+	Tracks []*Track
+}

backend/mediaprovider/subsonic/albumiterator.go

@@ -1,4 +1,4 @@
-package backend
+package subsonic
 
 import (
 	"log"
@@ -6,45 +6,35 @@ import (
 	"strings"
 
 	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/sharedutil"
 )
 
-type AlbumSortOrder string
-
 const (
-	AlbumSortRecentlyAdded    AlbumSortOrder = "Recently Added"
-	AlbumSortRecentlyPlayed   AlbumSortOrder = "Recently Played"
-	AlbumSortFrequentlyPlayed AlbumSortOrder = "Frequently Played"
-	AlbumSortRandom           AlbumSortOrder = "Random"
-	AlbumSortTitleAZ          AlbumSortOrder = "Title (A-Z)"
-	AlbumSortArtistAZ         AlbumSortOrder = "Artist (A-Z)"
-	AlbumSortYearAscending    AlbumSortOrder = "Year (ascending)"
-	AlbumSortYearDescending   AlbumSortOrder = "Year (descending)"
+	AlbumSortRecentlyAdded    string = "Recently Added"
+	AlbumSortRecentlyPlayed   string = "Recently Played"
+	AlbumSortFrequentlyPlayed string = "Frequently Played"
+	AlbumSortRandom           string = "Random"
+	AlbumSortTitleAZ          string = "Title (A-Z)"
+	AlbumSortArtistAZ         string = "Artist (A-Z)"
+	AlbumSortYearAscending    string = "Year (ascending)"
+	AlbumSortYearDescending   string = "Year (descending)"
 )
 
-var (
-	AlbumSortOrders []string = []string{
-		string(AlbumSortRecentlyAdded),
-		string(AlbumSortRecentlyPlayed),
-		string(AlbumSortFrequentlyPlayed),
-		string(AlbumSortRandom),
-		string(AlbumSortTitleAZ),
-		string(AlbumSortArtistAZ),
-		string(AlbumSortYearAscending),
-		string(AlbumSortYearDescending),
+func (s *subsonicMediaProvider) AlbumSortOrders() []string {
+	return []string{
+		AlbumSortRecentlyAdded,
+		AlbumSortRecentlyPlayed,
+		AlbumSortFrequentlyPlayed,
+		AlbumSortRandom,
+		AlbumSortTitleAZ,
+		AlbumSortArtistAZ,
+		AlbumSortYearAscending,
+		AlbumSortYearDescending,
 	}
-)
-
-type AlbumFilter struct {
-	MinYear int
-	MaxYear int      // 0 == unset/match any
-	Genres  []string // len(0) == unset/match any
-
-	ExcludeFavorited   bool // mut. exc. with ExcludeUnfavorited
-	ExcludeUnfavorited bool // mut. exc. with ExcludeFavorited
 }
 
-func (f *AlbumFilter) Matches(album *subsonic.AlbumID3) bool {
+func filterMatches(f mediaprovider.AlbumFilter, album *subsonic.AlbumID3) bool {
 	if album == nil {
 		return false
 	}
@@ -68,82 +58,66 @@ func (f *AlbumFilter) Matches(album *subsonic.AlbumID3) bool {
 	return false
 }
 
-func (f *AlbumFilter) IsEmpty() bool {
-	return !f.ExcludeFavorited && !f.ExcludeUnfavorited &&
-		f.MinYear == 0 && f.MaxYear == 0 && len(f.Genres) == 0
-}
-
-func (l *LibraryManager) AlbumsIter(sort AlbumSortOrder, filter AlbumFilter) AlbumIterator {
-	switch sort {
+func (s *subsonicMediaProvider) IterateAlbums(sortOrder string, filter mediaprovider.AlbumFilter) mediaprovider.AlbumIterator {
+	if sortOrder == "" && len(filter.Genres) == 1 {
+		return s.newBaseIter("byGenre", filter, s.prefetchCoverCB, map[string]string{"genre": filter.Genres[0]})
+	}
+	if sortOrder == "" && filter.ExcludeUnfavorited {
+		return s.newBaseIter("starred", filter, s.prefetchCoverCB, make(map[string]string))
+	}
+	if sortOrder == "" {
+		sortOrder = AlbumSortRecentlyAdded // default
+	}
+	switch sortOrder {
 	case AlbumSortRecentlyAdded:
-		return l.newBaseIter("newest", filter, make(map[string]string))
+		return s.newBaseIter("newest", filter, s.prefetchCoverCB, make(map[string]string))
 	case AlbumSortRecentlyPlayed:
-		return l.newBaseIter("recent", filter, make(map[string]string))
+		return s.newBaseIter("recent", filter, s.prefetchCoverCB, make(map[string]string))
 	case AlbumSortFrequentlyPlayed:
-		return l.newBaseIter("frequent", filter, make(map[string]string))
+		return s.newBaseIter("frequent", filter, s.prefetchCoverCB, make(map[string]string))
 	case AlbumSortRandom:
-		return l.newRandomIter()
+		return s.newRandomIter(filter, s.prefetchCoverCB)
 	case AlbumSortTitleAZ:
-		return l.newBaseIter("alphabeticalByName", filter, make(map[string]string))
+		return s.newBaseIter("alphabeticalByName", filter, s.prefetchCoverCB, make(map[string]string))
 	case AlbumSortArtistAZ:
-		return l.newBaseIter("alphabeticalByArtist", filter, make(map[string]string))
+		return s.newBaseIter("alphabeticalByArtist", filter, s.prefetchCoverCB, make(map[string]string))
 	case AlbumSortYearAscending:
-		return l.newBaseIter("byYear", filter, map[string]string{"fromYear": "0", "toYear": "3000"})
+		return s.newBaseIter("byYear", filter, s.prefetchCoverCB, map[string]string{"fromYear": "0", "toYear": "3000"})
 	case AlbumSortYearDescending:
-		return l.newBaseIter("byYear", filter, map[string]string{"fromYear": "3000", "toYear": "0"})
+		return s.newBaseIter("byYear", filter, s.prefetchCoverCB, map[string]string{"fromYear": "3000", "toYear": "0"})
 	default:
-		log.Printf("Undefined album sort order: %s", sort)
+		log.Printf("Undefined album sort order: %s", sortOrder)
 		return nil
 	}
 }
 
-func (l *LibraryManager) StarredIter(filter AlbumFilter) AlbumIterator {
-	return l.newBaseIter("starred", filter, make(map[string]string))
-}
-
-func (l *LibraryManager) GenreIter(genre string, filter AlbumFilter) AlbumIterator {
-	return l.newBaseIter("byGenre", filter, map[string]string{"genre": genre})
-}
-
-func (l *LibraryManager) SearchIter(query string) AlbumIterator {
-	return l.newSearchIter(query, AlbumFilter{})
-}
-
-func (l *LibraryManager) SearchIterWithFilter(query string, filter AlbumFilter) AlbumIterator {
-	return l.newSearchIter(query, filter)
-}
-
-func (l *LibraryManager) GetAlbum(id string) (*subsonic.AlbumID3, error) {
-	a, err := l.s.Server.GetAlbum(id)
-	if err != nil {
-		return nil, err
-	}
-	return a, nil
+func (s *subsonicMediaProvider) SearchAlbums(searchQuery string, filter mediaprovider.AlbumFilter) mediaprovider.AlbumIterator {
+	return s.newSearchIter(searchQuery, filter, s.prefetchCoverCB)
 }
 
 type baseIter struct {
 	listType      string
-	filter        AlbumFilter
+	filter        mediaprovider.AlbumFilter
+	prefetchCB    func(string)
 	serverPos     int
-	l             *LibraryManager
 	s             *subsonic.Client
 	opts          map[string]string
-	prefetched    []*subsonic.AlbumID3
+	prefetched    []*mediaprovider.Album
 	prefetchedPos int
 	done          bool
 }
 
-func (l *LibraryManager) newBaseIter(listType string, filter AlbumFilter, opts map[string]string) *baseIter {
+func (s *subsonicMediaProvider) newBaseIter(listType string, filter mediaprovider.AlbumFilter, cb func(string), opts map[string]string) *baseIter {
 	return &baseIter{
-		listType: listType,
-		filter:   filter,
-		l:        l,
-		s:        l.s.Server,
-		opts:     opts,
+		prefetchCB: cb,
+		listType:   listType,
+		filter:     filter,
+		s:          s.client,
+		opts:       opts,
 	}
 }
 
-func (r *baseIter) Next() *subsonic.AlbumID3 {
+func (r *baseIter) Next() *mediaprovider.Album {
 	if r.done {
 		return nil
 	}
@@ -165,46 +139,45 @@ func (r *baseIter) Next() *subsonic.AlbumID3 {
 			return nil
 		}
 		r.serverPos += len(albums)
-		albums = sharedutil.FilterSlice(albums, r.filter.Matches)
-		r.prefetched = albums
+		albums = sharedutil.FilterSlice(albums, func(al *subsonic.AlbumID3) bool { return filterMatches(r.filter, al) })
+		r.prefetched = sharedutil.MapSlice(albums, toAlbum)
 		if len(albums) > 0 {
 			break
 		}
 	}
 	r.prefetchedPos = 1
-	if r.l.PreCacheCoverFn != nil {
+	if r.prefetchCB != nil {
 		for _, album := range r.prefetched {
-			go r.l.PreCacheCoverFn(album.CoverArt)
+			go r.prefetchCB(album.CoverArtID)
 		}
 	}
-
 	return r.prefetched[0]
 }
 
 type searchIter struct {
 	searchIterBase
 
-	l             *LibraryManager
-	filter        AlbumFilter
+	prefetchCB    func(string)
+	filter        mediaprovider.AlbumFilter
 	prefetched    []*subsonic.AlbumID3
 	prefetchedPos int
 	albumIDset    map[string]bool
 	done          bool
 }
 
-func (l *LibraryManager) newSearchIter(query string, filter AlbumFilter) *searchIter {
+func (s *subsonicMediaProvider) newSearchIter(query string, filter mediaprovider.AlbumFilter, cb func(string)) *searchIter {
 	return &searchIter{
 		searchIterBase: searchIterBase{
 			query: query,
-			s:     l.s.Server,
+			s:     s.client,
 		},
-		l:          l,
+		prefetchCB: cb,
 		filter:     filter,
 		albumIDset: make(map[string]bool),
 	}
 }
 
-func (s *searchIter) Next() *subsonic.AlbumID3 {
+func (s *searchIter) Next() *mediaprovider.Album {
 	if s.done {
 		return nil
 	}
@@ -257,7 +230,7 @@ func (s *searchIter) Next() *subsonic.AlbumID3 {
 			s.prefetchedPos = 0
 		}
 
-		return a
+		return toAlbum(a)
 	}
 
 	return nil
@@ -268,20 +241,21 @@ func (s *searchIter) addNewAlbums(al []*subsonic.AlbumID3) {
 		if _, have := s.albumIDset[album.ID]; have {
 			continue
 		}
-		if !s.filter.Matches(album) {
+		if !filterMatches(s.filter, album) {
 			continue
 		}
 		s.prefetched = append(s.prefetched, album)
-		if s.l.PreCacheCoverFn != nil {
-			go s.l.PreCacheCoverFn(album.CoverArt)
+		if s.prefetchCB != nil {
+			go s.prefetchCB(album.CoverArt)
 		}
 		s.albumIDset[album.ID] = true
 	}
 }
 
 type randomIter struct {
+	filter        mediaprovider.AlbumFilter
+	prefetchCB    func(coverArtID string)
 	albumIDSet    map[string]bool
-	l             *LibraryManager
 	s             *subsonic.Client
 	prefetched    []*subsonic.AlbumID3
 	prefetchedPos int
@@ -296,44 +270,45 @@ type randomIter struct {
 	done     bool
 }
 
-func (l *LibraryManager) newRandomIter() *randomIter {
+func (s *subsonicMediaProvider) newRandomIter(filter mediaprovider.AlbumFilter, cb func(string)) *randomIter {
 	return &randomIter{
-		l:          l,
-		s:          l.s.Server,
+		filter:     filter,
+		prefetchCB: cb,
+		s:          s.client,
 		albumIDSet: make(map[string]bool),
 	}
 }
 
-func (r *randomIter) Next() *subsonic.AlbumID3 {
+func (r *randomIter) Next() *mediaprovider.Album {
 	if r.done {
 		return nil
 	}
 
-	if r.prefetched == nil {
+	// repeat fetch task until we have matching results
+	// or we reach the end (handled via short circuit return)
+	for len(r.prefetched) == 0 {
 		if r.phaseTwo {
-			for len(r.prefetched) == 0 {
-				albums, err := r.s.GetAlbumList2("newest", map[string]string{"size": "20", "offset": strconv.Itoa(r.offset)})
-				if err != nil {
-					log.Println(err)
-					albums = nil
-				}
-				if len(albums) == 0 {
-					r.done = true
-					r.albumIDSet = nil
-					return nil
-				}
-				r.offset += len(albums)
-				for _, album := range albums {
-					if _, ok := r.albumIDSet[album.ID]; !ok {
-						r.prefetched = append(r.prefetched, album)
-						if r.l.PreCacheCoverFn != nil {
-							go r.l.PreCacheCoverFn(album.CoverArt)
-						}
-						r.albumIDSet[album.ID] = true
+			// fetch albums from deterministic order
+			albums, err := r.s.GetAlbumList2("newest", map[string]string{"size": "25", "offset": strconv.Itoa(r.offset)})
+			if err != nil {
+				log.Printf("error fetching albums: %s", err.Error())
+				albums = nil
+			}
+			if len(albums) == 0 {
+				r.done = true
+				r.albumIDSet = nil
+				return nil
+			}
+			r.offset += len(albums)
+			for _, album := range albums {
+				if _, ok := r.albumIDSet[album.ID]; !ok && filterMatches(r.filter, album) {
+					r.prefetched = append(r.prefetched, album)
+					if r.prefetchCB != nil {
+						go r.prefetchCB(album.CoverArt)
 					}
+					r.albumIDSet[album.ID] = true
 				}
 			}
-			r.prefetchedPos = 0
 		} else {
 			albums, err := r.s.GetAlbumList2("random", map[string]string{"size": "25"})
 			if err != nil {
@@ -345,12 +320,16 @@ func (r *randomIter) Next() *subsonic.AlbumID3 {
 			var hitCount int
 			for _, album := range albums {
 				if _, ok := r.albumIDSet[album.ID]; !ok {
+					// still need to keep track even if album is not matched
+					// by the filter because we need to know when to move to phase two
 					hitCount++
-					r.prefetched = append(r.prefetched, album)
-					if r.l.PreCacheCoverFn != nil {
-						go r.l.PreCacheCoverFn(album.CoverArt)
-					}
 					r.albumIDSet[album.ID] = true
+					if filterMatches(r.filter, album) {
+						r.prefetched = append(r.prefetched, album)
+						if r.prefetchCB != nil {
+							go r.prefetchCB(album.CoverArt)
+						}
+					}
 				}
 			}
 			if successRatio := float64(hitCount) / float64(25); successRatio < 0.3 {
@@ -368,30 +347,8 @@ func (r *randomIter) Next() *subsonic.AlbumID3 {
 			r.prefetchedPos = 0
 		}
 
-		return a
+		return toAlbum(a)
 	}
 
 	return nil
 }
-
-type BatchingIterator struct {
-	iter AlbumIterator
-}
-
-func NewBatchingIterator(iter AlbumIterator) *BatchingIterator {
-	return &BatchingIterator{iter}
-}
-
-func (b *BatchingIterator) NextN(n int) []*subsonic.AlbumID3 {
-	results := make([]*subsonic.AlbumID3, 0, n)
-	i := 0
-	for i < n {
-		album := b.iter.Next()
-		if album == nil {
-			break
-		}
-		results = append(results, album)
-		i++
-	}
-	return results
-}

backend/mediaprovider/subsonic/searchiterbase.go

@@ -0,0 +1,33 @@
+package subsonic
+
+import (
+	"log"
+	"strconv"
+
+	"github.com/dweymouth/go-subsonic/subsonic"
+)
+
+type searchIterBase struct {
+	query        string
+	artistOffset int
+	albumOffset  int
+	songOffset   int
+	s            *subsonic.Client
+}
+
+func (s *searchIterBase) fetchResults() *subsonic.SearchResult3 {
+	searchOpts := map[string]string{
+		"artistOffset": strconv.Itoa(s.artistOffset),
+		"albumOffset":  strconv.Itoa(s.albumOffset),
+		"songOffset":   strconv.Itoa(s.songOffset),
+	}
+	results, err := s.s.Search3(s.query, searchOpts)
+	if err != nil {
+		log.Println(err)
+		results = nil
+	}
+	if results == nil || len(results.Album)+len(results.Artist)+len(results.Song) == 0 {
+		return nil
+	}
+	return results
+}

backend/mediaprovider/subsonic/subsonicmediaprovider.go

@@ -0,0 +1,338 @@
+package subsonic
+
+import (
+	"image"
+	"math"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
+	"github.com/dweymouth/supersonic/sharedutil"
+)
+
+type subsonicMediaProvider struct {
+	client          *subsonic.Client
+	prefetchCoverCB func(coverArtID string)
+}
+
+func SubsonicMediaProvider(subsonicClient *subsonic.Client) mediaprovider.MediaProvider {
+	return &subsonicMediaProvider{client: subsonicClient}
+}
+
+func (s *subsonicMediaProvider) SetPrefetchCoverCallback(cb func(coverArtID string)) {
+	s.prefetchCoverCB = cb
+}
+
+func (s *subsonicMediaProvider) CreatePlaylist(name string, trackIDs []string) error {
+	return s.client.CreatePlaylistWithTracks(trackIDs, map[string]string{"name": name})
+}
+
+func (s *subsonicMediaProvider) DeletePlaylist(id string) error {
+	return s.client.DeletePlaylist(id)
+}
+
+func (s *subsonicMediaProvider) EditPlaylist(id, name, description string, public bool) error {
+	return s.client.UpdatePlaylist(id, map[string]string{
+		"name":    name,
+		"comment": description,
+		"public":  strconv.FormatBool(public),
+	})
+}
+
+func (s *subsonicMediaProvider) EditPlaylistTracks(id string, trackIDsToAdd []string, trackIndexesToRemove []int) error {
+	return s.client.UpdatePlaylistTracks(id, trackIDsToAdd, trackIndexesToRemove)
+}
+
+func (s *subsonicMediaProvider) GetAlbum(albumID string) (*mediaprovider.AlbumWithTracks, error) {
+	al, err := s.client.GetAlbum(albumID)
+	if err != nil {
+		return nil, err
+	}
+	album := &mediaprovider.AlbumWithTracks{
+		Tracks: sharedutil.MapSlice(al.Song, toTrack),
+	}
+	fillAlbum(al, &album.Album)
+	return album, nil
+}
+
+func (s *subsonicMediaProvider) GetArtist(artistID string) (*mediaprovider.ArtistWithAlbums, error) {
+	ar, err := s.client.GetArtist(artistID)
+	if err != nil {
+		return nil, err
+	}
+	return &mediaprovider.ArtistWithAlbums{
+		Artist: mediaprovider.Artist{
+			ID:         ar.ID,
+			Name:       ar.Name,
+			Favorite:   !ar.Starred.IsZero(),
+			AlbumCount: ar.AlbumCount,
+		},
+		Albums: sharedutil.MapSlice(ar.Album, toAlbum),
+	}, nil
+}
+
+func (s *subsonicMediaProvider) GetArtistInfo(artistID string) (*mediaprovider.ArtistInfo, error) {
+	info, err := s.client.GetArtistInfo(artistID, map[string]string{})
+	if err != nil {
+		return nil, err
+	}
+	return &mediaprovider.ArtistInfo{
+		Biography:      info.Biography,
+		LastFMUrl:      info.LastFmUrl,
+		ImageURL:       info.LargeImageUrl,
+		SimilarArtists: sharedutil.MapSlice(info.SimilarArtist, toArtist),
+	}, nil
+}
+
+func (s *subsonicMediaProvider) GetArtists() ([]*mediaprovider.Artist, error) {
+	idxs, err := s.client.GetArtists(map[string]string{})
+	if err != nil {
+		return nil, err
+	}
+	var artists []*mediaprovider.Artist
+	for _, idx := range idxs.Index {
+		for _, ar := range idx.Artist {
+			artists = append(artists, toArtistFromID3(ar))
+		}
+	}
+	return artists, nil
+}
+
+func (s *subsonicMediaProvider) GetCoverArt(id string, size int) (image.Image, error) {
+	params := map[string]string{}
+	if size > 0 {
+		params["size"] = strconv.Itoa(size)
+	}
+	return s.client.GetCoverArt(id, params)
+}
+
+func (s *subsonicMediaProvider) GetFavorites() (mediaprovider.Favorites, error) {
+	fav, err := s.client.GetStarred2(map[string]string{})
+	if err != nil {
+		return mediaprovider.Favorites{}, err
+	}
+	return mediaprovider.Favorites{
+		Albums:  sharedutil.MapSlice(fav.Album, toAlbum),
+		Artists: sharedutil.MapSlice(fav.Artist, toArtistFromID3),
+		Tracks:  sharedutil.MapSlice(fav.Song, toTrack),
+	}, nil
+}
+
+func (s *subsonicMediaProvider) GetGenres() ([]*mediaprovider.Genre, error) {
+	g, err := s.client.GetGenres()
+	if err != nil {
+		return nil, err
+	}
+	return sharedutil.MapSlice(g, func(g *subsonic.Genre) *mediaprovider.Genre {
+		return &mediaprovider.Genre{
+			Name:       g.Name,
+			AlbumCount: g.AlbumCount,
+			TrackCount: g.SongCount,
+		}
+	}), nil
+}
+
+func (s *subsonicMediaProvider) GetPlaylist(playlistID string) (*mediaprovider.PlaylistWithTracks, error) {
+	pl, err := s.client.GetPlaylist(playlistID)
+	if err != nil {
+		return nil, err
+	}
+	playlist := &mediaprovider.PlaylistWithTracks{
+		Tracks: sharedutil.MapSlice(pl.Entry, toTrack),
+	}
+	fillPlaylist(pl, &playlist.Playlist)
+	return playlist, nil
+}
+
+func (s *subsonicMediaProvider) GetPlaylists() ([]*mediaprovider.Playlist, error) {
+	pl, err := s.client.GetPlaylists(map[string]string{})
+	if err != nil {
+		return nil, err
+	}
+	return sharedutil.MapSlice(pl, toPlaylist), nil
+}
+
+func (s *subsonicMediaProvider) GetRandomTracks(genreName string, count int) ([]*mediaprovider.Track, error) {
+	opts := map[string]string{"size": strconv.Itoa(count)}
+	if genreName != "" {
+		opts["genre"] = genreName
+	}
+	tr, err := s.client.GetRandomSongs(opts)
+	if err != nil {
+		return nil, err
+	}
+	return sharedutil.MapSlice(tr, toTrack), nil
+}
+
+func (s *subsonicMediaProvider) GetSimilarTracks(artistID string, count int) ([]*mediaprovider.Track, error) {
+	tr, err := s.client.GetSimilarSongs2(artistID, map[string]string{"count": strconv.Itoa(count)})
+	if err != nil {
+		return nil, err
+	}
+	return sharedutil.MapSlice(tr, toTrack), nil
+}
+
+func (s *subsonicMediaProvider) GetStreamURL(trackID string) (string, error) {
+	u, err := s.client.GetStreamURL(trackID, map[string]string{})
+	if err != nil {
+		return "", err
+	}
+	return u.String(), nil
+}
+
+func (s *subsonicMediaProvider) GetTopTracks(artist mediaprovider.Artist, count int) ([]*mediaprovider.Track, error) {
+	params := map[string]string{}
+	if count > 0 {
+		params["count"] = strconv.Itoa(count)
+	}
+	tr, err := s.client.GetTopSongs(artist.Name, params)
+	if err != nil {
+		return nil, err
+	}
+	return sharedutil.MapSlice(tr, toTrack), nil
+}
+
+func (s *subsonicMediaProvider) ReplacePlaylistTracks(playlistID string, trackIDs []string) error {
+	return s.client.CreatePlaylistWithTracks(trackIDs, map[string]string{"playlistId": playlistID})
+}
+
+func (s *subsonicMediaProvider) Scrobble(trackID string, submission bool) error {
+	return s.client.Scrobble(trackID, map[string]string{
+		"time":       strconv.FormatInt(time.Now().UnixMilli(), 10),
+		"submission": strconv.FormatBool(submission)})
+}
+
+func (s *subsonicMediaProvider) SetFavorite(params mediaprovider.RatingFavoriteParameters, favorite bool) error {
+	subParams := subsonic.StarParameters{
+		AlbumIDs:  params.AlbumIDs,
+		ArtistIDs: params.ArtistIDs,
+		SongIDs:   params.TrackIDs,
+	}
+	if favorite {
+		return s.client.Star(subParams)
+	}
+	return s.client.Unstar(subParams)
+}
+
+func (s *subsonicMediaProvider) SetRating(params mediaprovider.RatingFavoriteParameters, rating int) error {
+	// Subsonic doesn't allow bulk setting ratings.
+	// To not overwhelm the server with requests, set rating for
+	// only 5 tracks at a time concurrently
+	batchSize := 5
+	var err error
+	batchSetRating := func(offs int, wg *sync.WaitGroup) {
+		for i := 0; i < batchSize && offs+i < len(params.TrackIDs); i++ {
+			wg.Add(1)
+			go func(idx int) {
+				newErr := s.client.SetRating(params.TrackIDs[idx], rating)
+				if err == nil && newErr != nil {
+					err = newErr
+				}
+				wg.Done()
+			}(offs + i)
+		}
+	}
+
+	numBatches := int(math.Ceil(float64(len(params.TrackIDs)) / float64(batchSize)))
+	for i := 0; i < numBatches; i++ {
+		var wg sync.WaitGroup
+		batchSetRating(i*batchSize, &wg)
+		wg.Wait()
+	}
+
+	return err
+}
+
+func toTrack(ch *subsonic.Child) *mediaprovider.Track {
+	if ch == nil {
+		return nil
+	}
+	return &mediaprovider.Track{
+		ID:          ch.ID,
+		CoverArtID:  ch.CoverArt,
+		ParentID:    ch.Parent,
+		Name:        ch.Title,
+		Duration:    ch.Duration,
+		TrackNumber: ch.Track,
+		DiscNumber:  ch.DiscNumber,
+		Genre:       ch.Genre,
+		ArtistIDs:   []string{ch.ArtistID},
+		ArtistNames: []string{ch.Artist},
+		Album:       ch.Album,
+		AlbumID:     ch.AlbumID,
+		Year:        ch.Year,
+		Rating:      ch.UserRating,
+		Favorite:    !ch.Starred.IsZero(),
+		PlayCount:   int(ch.PlayCount),
+		FilePath:    ch.Path,
+		Size:        ch.Size,
+		BitRate:     ch.BitRate,
+	}
+}
+
+func toAlbum(al *subsonic.AlbumID3) *mediaprovider.Album {
+	if al == nil {
+		return nil
+	}
+	album := &mediaprovider.Album{}
+	fillAlbum(al, album)
+	return album
+}
+
+func fillAlbum(subAlbum *subsonic.AlbumID3, album *mediaprovider.Album) {
+	album.ID = subAlbum.ID
+	album.CoverArtID = subAlbum.CoverArt
+	album.Name = subAlbum.Name
+	album.Duration = subAlbum.Duration
+	album.ArtistIDs = []string{subAlbum.ArtistID}
+	album.ArtistNames = []string{subAlbum.Artist}
+	album.Year = subAlbum.Year
+	album.TrackCount = subAlbum.SongCount
+	album.Genres = []string{subAlbum.Genre}
+	album.Favorite = !subAlbum.Starred.IsZero()
+}
+
+func toArtist(ar *subsonic.Artist) *mediaprovider.Artist {
+	if ar == nil {
+		return nil
+	}
+	return &mediaprovider.Artist{
+		ID:       ar.ID,
+		Name:     ar.Name,
+		Favorite: !ar.Starred.IsZero(),
+	}
+}
+
+func toArtistFromID3(ar *subsonic.ArtistID3) *mediaprovider.Artist {
+	if ar == nil {
+		return nil
+	}
+	return &mediaprovider.Artist{
+		ID:         ar.ID,
+		Name:       ar.Name,
+		Favorite:   !ar.Starred.IsZero(),
+		AlbumCount: ar.AlbumCount,
+	}
+}
+
+func toPlaylist(pl *subsonic.Playlist) *mediaprovider.Playlist {
+	if pl == nil {
+		return nil
+	}
+	playlist := &mediaprovider.Playlist{}
+	fillPlaylist(pl, playlist)
+	return playlist
+}
+
+func fillPlaylist(pl *subsonic.Playlist, playlist *mediaprovider.Playlist) {
+	playlist.Name = pl.Name
+	playlist.ID = pl.ID
+	playlist.CoverArtID = pl.CoverArt
+	playlist.Description = pl.Comment
+	playlist.Owner = pl.Owner
+	playlist.Public = pl.Public
+	playlist.TrackCount = pl.SongCount
+	playlist.Duration = pl.Duration
+}

backend/mediaprovider/subsonic/trackiterator.go

@@ -1,62 +1,62 @@
-package backend
+package subsonic
 
 import (
 	"log"
 
 	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 )
 
-func (l *LibraryManager) AllTracksIterator() TrackIterator {
-	return &allTracksIterator{
-		l:         l,
-		albumIter: l.AlbumsIter(AlbumSortArtistAZ, AlbumFilter{}),
+func (s *subsonicMediaProvider) IterateTracks(searchQuery string) mediaprovider.TrackIterator {
+	if searchQuery == "" {
+		return &allTracksIterator{
+			s:         s,
+			albumIter: s.IterateAlbums(AlbumSortArtistAZ, mediaprovider.AlbumFilter{}),
+		}
 	}
-}
-
-func (l *LibraryManager) SearchTracksIterator(query string) TrackIterator {
 	return &searchTracksIterator{
 		searchIterBase: searchIterBase{
-			s:     l.s.Server,
-			query: query,
+			s:     s.client,
+			query: searchQuery,
 		},
 		trackIDset: make(map[string]bool),
 	}
 }
 
 type allTracksIterator struct {
-	l           *LibraryManager
-	albumIter   AlbumIterator
-	curAlbum    *subsonic.AlbumID3
+	s           *subsonicMediaProvider
+	albumIter   mediaprovider.AlbumIterator
+	curAlbum    *mediaprovider.AlbumWithTracks
 	curTrackIdx int
 	done        bool
 }
 
-func (a *allTracksIterator) Next() *subsonic.Child {
+func (a *allTracksIterator) Next() *mediaprovider.Track {
 	if a.done {
 		return nil
 	}
 
 	// fetch next album
-	if a.curAlbum == nil || a.curTrackIdx >= len(a.curAlbum.Song) {
+	if a.curAlbum == nil || a.curTrackIdx >= len(a.curAlbum.Tracks) {
 		al := a.albumIter.Next()
 		if al == nil {
 			a.done = true
 			return nil
 		}
-		al, err := a.l.s.Server.GetAlbum(al.ID)
+		alWithTracks, err := a.s.GetAlbum(al.ID)
 		if err != nil {
 			log.Printf("error fetching album: %s", err.Error())
 		}
-		if len(al.Song) == 0 {
+		if len(alWithTracks.Tracks) == 0 {
 			// in the unlikely case of an album with zero tracks,
 			// just call recursively to move to next album
 			return a.Next()
 		}
-		a.curAlbum = al
+		a.curAlbum = alWithTracks
 		a.curTrackIdx = 0
 	}
 
-	tr := a.curAlbum.Song[a.curTrackIdx]
+	tr := a.curAlbum.Tracks[a.curTrackIdx]
 	a.curTrackIdx += 1
 	return tr
 }
@@ -70,7 +70,7 @@ type searchTracksIterator struct {
 	done          bool
 }
 
-func (s *searchTracksIterator) Next() *subsonic.Child {
+func (s *searchTracksIterator) Next() *mediaprovider.Track {
 	if s.done {
 		return nil
 	}
@@ -109,7 +109,7 @@ func (s *searchTracksIterator) Next() *subsonic.Child {
 			s.prefetched = s.prefetched[:0]
 			s.prefetchedPos = 0
 		}
-		return tr
+		return toTrack(tr)
 	}
 
 	// no more results

backend/playbackmanager.go

@@ -3,14 +3,12 @@ package backend
 import (
 	"context"
 	"log"
-	"strconv"
 	"time"
 
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/backend/util"
 	"github.com/dweymouth/supersonic/player"
 	"github.com/dweymouth/supersonic/sharedutil"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 const (
@@ -33,14 +31,14 @@ type PlaybackManager struct {
 	curTrackTime      float64
 	callbacksDisabled bool
 
-	playQueue     []*subsonic.Child
+	playQueue     []*mediaprovider.Track
 	nowPlayingIdx int64
 
 	// to pass to onSongChange listeners; clear once listeners have been called
-	lastScrobbled *subsonic.Child
+	lastScrobbled *mediaprovider.Track
 	scrobbleCfg   *ScrobbleConfig
 
-	onSongChange     []func(nowPlaying *subsonic.Child, justScrobbledIfAny *subsonic.Child)
+	onSongChange     []func(nowPlaying, justScrobbledIfAny *mediaprovider.Track)
 	onPlayTimeUpdate []func(float64, float64)
 }
 
@@ -111,7 +109,7 @@ func (p *PlaybackManager) DisableCallbacks() {
 }
 
 // Gets the curently playing song, if any.
-func (p *PlaybackManager) NowPlaying() *subsonic.Child {
+func (p *PlaybackManager) NowPlaying() *mediaprovider.Track {
 	if len(p.playQueue) == 0 || p.player.GetStatus().State == player.Stopped {
 		return nil
 	}
@@ -119,7 +117,7 @@ func (p *PlaybackManager) NowPlaying() *subsonic.Child {
 }
 
 // Sets a callback that is notified whenever a new song begins playing.
-func (p *PlaybackManager) OnSongChange(cb func(nowPlaying *subsonic.Child, justScrobbledIfAny *subsonic.Child)) {
+func (p *PlaybackManager) OnSongChange(cb func(nowPlaying *mediaprovider.Track, justScrobbledIfAny *mediaprovider.Track)) {
 	p.onSongChange = append(p.onSongChange, cb)
 }
 
@@ -134,7 +132,7 @@ func (p *PlaybackManager) LoadAlbum(albumID string, appendToQueue bool, shuffle
 	if err != nil {
 		return err
 	}
-	return p.LoadTracks(album.Song, appendToQueue, shuffle)
+	return p.LoadTracks(album.Tracks, appendToQueue, shuffle)
 }
 
 // Loads the specified playlist into the play queue.
@@ -143,10 +141,10 @@ func (p *PlaybackManager) LoadPlaylist(playlistID string, appendToQueue bool, sh
 	if err != nil {
 		return err
 	}
-	return p.LoadTracks(playlist.Entry, appendToQueue, shuffle)
+	return p.LoadTracks(playlist.Tracks, appendToQueue, shuffle)
 }
 
-func (p *PlaybackManager) LoadTracks(tracks []*subsonic.Child, appendToQueue, shuffle bool) error {
+func (p *PlaybackManager) LoadTracks(tracks []*mediaprovider.Track, appendToQueue, shuffle bool) error {
 	if !appendToQueue {
 		p.player.Stop()
 		p.nowPlayingIdx = 0
@@ -157,11 +155,11 @@ func (p *PlaybackManager) LoadTracks(tracks []*subsonic.Child, appendToQueue, sh
 		util.ShuffleSlice(nums)
 	}
 	for _, i := range nums {
-		url, err := p.sm.Server.GetStreamURL(tracks[i].ID, map[string]string{})
+		url, err := p.sm.Server.GetStreamURL(tracks[i].ID)
 		if err != nil {
 			return err
 		}
-		p.player.AppendFile(url.String())
+		p.player.AppendFile(url)
 		// ensure a deep copy of the track info so that we can maintain our own state
 		// (tracking play count increases, favorite, and rating) without messing up
 		// other views' track models
@@ -200,11 +198,7 @@ func (p *PlaybackManager) PlayTrackAt(idx int) error {
 }
 
 func (p *PlaybackManager) PlayRandomSongs(genreName string) {
-	params := map[string]string{"size": "100"}
-	if genreName != "" {
-		params["genre"] = genreName
-	}
-	if songs, err := p.sm.Server.GetRandomSongs(params); err != nil {
+	if songs, err := p.sm.Server.GetRandomTracks(genreName, 100); err != nil {
 		log.Printf("error getting random songs: %s", err.Error())
 	} else {
 		p.LoadTracks(songs, false, false)
@@ -213,8 +207,7 @@ func (p *PlaybackManager) PlayRandomSongs(genreName string) {
 }
 
 func (p *PlaybackManager) PlaySimilarSongs(id string) {
-	params := map[string]string{"size": "100"}
-	if songs, err := p.sm.Server.GetSimilarSongs2(id, params); err != nil {
+	if songs, err := p.sm.Server.GetSimilarTracks(id, 100); err != nil {
 		log.Printf("error getting similar songs: %s", err.Error())
 	} else {
 		p.LoadTracks(songs, false, false)
@@ -222,8 +215,8 @@ func (p *PlaybackManager) PlaySimilarSongs(id string) {
 	}
 }
 
-func (p *PlaybackManager) GetPlayQueue() []*subsonic.Child {
-	pq := make([]*subsonic.Child, len(p.playQueue))
+func (p *PlaybackManager) GetPlayQueue() []*mediaprovider.Track {
+	pq := make([]*mediaprovider.Track, len(p.playQueue))
 	for i, tr := range p.playQueue {
 		copy := *tr
 		pq[i] = &copy
@@ -235,11 +228,7 @@ func (p *PlaybackManager) GetPlayQueue() []*subsonic.Child {
 // this should be called to ensure the in-memory track model is updated.
 func (p *PlaybackManager) OnTrackFavoriteStatusChanged(id string, fav bool) {
 	if tr := sharedutil.FindTrackByID(id, p.playQueue); tr != nil {
-		if fav {
-			tr.Starred = time.Now()
-		} else {
-			tr.Starred = time.Time{}
-		}
+		tr.Favorite = fav
 	}
 }
 
@@ -247,13 +236,13 @@ func (p *PlaybackManager) OnTrackFavoriteStatusChanged(id string, fav bool) {
 // this should be called to ensure the in-memory track model is updated.
 func (p *PlaybackManager) OnTrackRatingChanged(id string, rating int) {
 	if tr := sharedutil.FindTrackByID(id, p.playQueue); tr != nil {
-		tr.UserRating = rating
+		tr.Rating = rating
 	}
 }
 
 // trackIdxs must be sorted
 func (p *PlaybackManager) RemoveTracksFromQueue(trackIdxs []int) {
-	newQueue := make([]*subsonic.Child, 0, len(p.playQueue)-len(trackIdxs))
+	newQueue := make([]*mediaprovider.Track, 0, len(p.playQueue)-len(trackIdxs))
 	rmCount := 0
 	rmIdx := 0
 	for i, tr := range p.playQueue {
@@ -310,10 +299,10 @@ func (p *PlaybackManager) checkScrobble(playDur time.Duration) {
 		playDur.Seconds() >= float64(p.scrobbleCfg.ThresholdTimeSeconds)
 	if timeThresholdMet || pcnt >= float64(p.scrobbleCfg.ThresholdPercent) {
 		song := p.playQueue[p.nowPlayingIdx]
-		log.Printf("Scrobbling %q", song.Title)
+		log.Printf("Scrobbling %q", song.Name)
 		song.PlayCount += 1
 		p.lastScrobbled = song
-		go p.sm.Server.Scrobble(song.ID, map[string]string{"time": strconv.FormatInt(time.Now().Unix()*1000, 10)})
+		go p.sm.Server.Scrobble(song.ID, true)
 	}
 }
 
@@ -322,10 +311,7 @@ func (p *PlaybackManager) sendNowPlayingScrobble() {
 		return
 	}
 	song := p.playQueue[p.nowPlayingIdx]
-	go p.sm.Server.Scrobble(song.ID, map[string]string{
-		"time":       strconv.FormatInt(time.Now().Unix()*1000, 10),
-		"submission": "false",
-	})
+	go p.sm.Server.Scrobble(song.ID, false)
 }
 
 func (p *PlaybackManager) invokeOnSongChangeCallbacks() {

backend/servermanager.go

@@ -7,14 +7,18 @@ import (
 	"time"
 
 	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
+	subsonicMP "github.com/dweymouth/supersonic/backend/mediaprovider/subsonic"
 	"github.com/google/uuid"
 	"github.com/zalando/go-keyring"
 )
 
 type ServerManager struct {
-	ServerID uuid.UUID
-	Server   *subsonic.Client
+	LoggedInUser string
+	ServerID     uuid.UUID
+	Server       mediaprovider.MediaProvider
 
+	prefetchCoverCB   func(string)
 	appName           string
 	onServerConnected []func()
 	onLogout          []func()
@@ -26,12 +30,21 @@ func NewServerManager(appName string) *ServerManager {
 	return &ServerManager{appName: appName}
 }
 
+func (s *ServerManager) SetPrefetchAlbumCoverCallback(cb func(string)) {
+	s.prefetchCoverCB = cb
+	if s.Server != nil {
+		s.Server.SetPrefetchCoverCallback(cb)
+	}
+}
+
 func (s *ServerManager) ConnectToServer(conf *ServerConfig, password string) error {
 	cli, err := s.testConnectionAndCreateClient(conf.ServerConnection, password)
 	if err != nil {
 		return err
 	}
-	s.Server = cli
+	s.Server = subsonicMP.SubsonicMediaProvider(cli)
+	s.Server.SetPrefetchCoverCallback(s.prefetchCoverCB)
+	s.LoggedInUser = conf.Username
 	s.ServerID = conf.ID
 	for _, cb := range s.onServerConnected {
 		cb()
@@ -116,6 +129,7 @@ func (s *ServerManager) Logout() {
 			cb()
 		}
 		s.Server = nil
+		s.LoggedInUser = ""
 		s.ServerID = uuid.UUID{}
 	}
 }

sharedutil/sharedutil.go

@@ -4,7 +4,7 @@ import (
 	"math"
 	"sort"
 
-	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 )
 
 func SliceContains[T comparable](ts []T, t T) bool {
@@ -40,7 +40,7 @@ func MapSlice[T any, U any](ts []T, f func(T) U) []U {
 	return result
 }
 
-func FindTrackByID(id string, tracks []*subsonic.Child) *subsonic.Child {
+func FindTrackByID(id string, tracks []*mediaprovider.Track) *mediaprovider.Track {
 	for _, tr := range tracks {
 		if id == tr.ID {
 			return tr
@@ -49,15 +49,15 @@ func FindTrackByID(id string, tracks []*subsonic.Child) *subsonic.Child {
 	return nil
 }
 
-func TrackIDOrEmptyStr(track *subsonic.Child) string {
+func TrackIDOrEmptyStr(track *mediaprovider.Track) string {
 	if track == nil {
 		return ""
 	}
 	return track.ID
 }
 
-func TracksToIDs(tracks []*subsonic.Child) []string {
-	return MapSlice(tracks, func(tr *subsonic.Child) string {
+func TracksToIDs(tracks []*mediaprovider.Track) []string {
+	return MapSlice(tracks, func(tr *mediaprovider.Track) string {
 		return tr.ID
 	})
 }
@@ -73,8 +73,8 @@ const (
 
 // Reorder tracks and return a new track slice.
 // idxToMove must contain only valid indexes into tracks, and no repeats
-func ReorderTracks(tracks []*subsonic.Child, idxToMove []int, op TrackReorderOp) []*subsonic.Child {
-	newTracks := make([]*subsonic.Child, len(tracks))
+func ReorderTracks(tracks []*mediaprovider.Track, idxToMove []int, op TrackReorderOp) []*mediaprovider.Track {
+	newTracks := make([]*mediaprovider.Track, len(tracks))
 	switch op {
 	case MoveToTop:
 		topIdx := 0

sharedutil/sharedutil_test.go

@@ -3,11 +3,11 @@ package sharedutil
 import (
 	"testing"
 
-	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 )
 
 func Test_ReorderTracks(t *testing.T) {
-	tracks := []*subsonic.Child{
+	tracks := []*mediaprovider.Track{
 		{ID: "a"}, // 0
 		{ID: "b"}, // 1
 		{ID: "c"}, // 2
@@ -18,7 +18,7 @@ func Test_ReorderTracks(t *testing.T) {
 
 	// test MoveToTop:
 	idxToMove := []int{0, 2, 3, 5}
-	want := []*subsonic.Child{
+	want := []*mediaprovider.Track{
 		{ID: "a"},
 		{ID: "c"},
 		{ID: "d"},
@@ -33,7 +33,7 @@ func Test_ReorderTracks(t *testing.T) {
 
 	// test MoveToBottom:
 	idxToMove = []int{0, 2, 5}
-	want = []*subsonic.Child{
+	want = []*mediaprovider.Track{
 		{ID: "b"},
 		{ID: "d"},
 		{ID: "e"},
@@ -48,7 +48,7 @@ func Test_ReorderTracks(t *testing.T) {
 
 	// test MoveUp:
 	idxToMove = []int{0, 1, 3, 5}
-	want = []*subsonic.Child{
+	want = []*mediaprovider.Track{
 		{ID: "a"},
 		{ID: "b"},
 		{ID: "d"},
@@ -63,7 +63,7 @@ func Test_ReorderTracks(t *testing.T) {
 
 	// test MoveDown:
 	idxToMove = []int{2, 4, 5}
-	want = []*subsonic.Child{
+	want = []*mediaprovider.Track{
 		{ID: "a"},
 		{ID: "b"},
 		{ID: "d"},
@@ -77,7 +77,7 @@ func Test_ReorderTracks(t *testing.T) {
 	}
 }
 
-func tracklistsEqual(t *testing.T, a, b []*subsonic.Child) bool {
+func tracklistsEqual(t *testing.T, a, b []*mediaprovider.Track) bool {
 	t.Helper()
 	if len(a) != len(b) {
 		return false

ui/bottompanel.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/player"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
@@ -15,7 +16,6 @@ import (
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/widget"
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type BottomPanel struct {
@@ -69,7 +69,7 @@ func NewBottomPanel(p *player.Player, contr *controller.Controller) *BottomPanel
 		contr.NavigateTo(controller.AlbumRoute(bp.playbackManager.NowPlaying().AlbumID))
 	})
 	bp.NowPlaying.OnArtistNameTapped(func() {
-		contr.NavigateTo(controller.ArtistRoute(bp.playbackManager.NowPlaying().ArtistID))
+		contr.NavigateTo(controller.ArtistRoute(bp.playbackManager.NowPlaying().ArtistIDs[0]))
 	})
 	bp.NowPlaying.OnTrackNameTapped(func() {
 		contr.NavigateTo(controller.NowPlayingRoute(bp.playbackManager.NowPlaying().ID))
@@ -108,11 +108,11 @@ func (bp *BottomPanel) SetPlaybackManager(pm *backend.PlaybackManager) {
 	})
 }
 
-func (bp *BottomPanel) onSongChange(song *subsonic.Child, _ *subsonic.Child) {
+func (bp *BottomPanel) onSongChange(song, _ *mediaprovider.Track) {
 	if song == nil {
 		bp.NowPlaying.Update("", "", false, "", nil)
 	} else {
-		bp.coverArtID = song.CoverArt
+		bp.coverArtID = song.CoverArtID
 		var im image.Image
 		if bp.ImageManager != nil {
 			// set image to expire not long after the length of the song
@@ -120,9 +120,9 @@ func (bp *BottomPanel) onSongChange(song *subsonic.Child, _ *subsonic.Child) {
 			// be in cache for the next song if it's from the same album, or
 			// if the user navigates to the album page for the track
 			imgTTLSec := song.Duration + 30
-			im, _ = bp.ImageManager.GetCoverThumbnailWithTTL(song.CoverArt, time.Duration(imgTTLSec)*time.Second)
+			im, _ = bp.ImageManager.GetCoverThumbnailWithTTL(song.CoverArtID, time.Duration(imgTTLSec)*time.Second)
 		}
-		bp.NowPlaying.Update(song.Title, song.Artist, song.ArtistID != "", song.Album, im)
+		bp.NowPlaying.Update(song.Name, song.ArtistNames[0], song.ArtistIDs[0] != "", song.Album, im)
 	}
 }
 

ui/browsing/albumpage.go

@@ -5,6 +5,7 @@ import (
 	"log"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
@@ -17,8 +18,6 @@ import (
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type AlbumPage struct {
@@ -35,19 +34,17 @@ type AlbumPage struct {
 type albumPageState struct {
 	albumID string
 	cfg     *backend.AlbumPageConfig
-	lm      *backend.LibraryManager
+	mp      mediaprovider.MediaProvider
 	pm      *backend.PlaybackManager
 	im      *backend.ImageManager
-	sm      *backend.ServerManager
 	contr   *controller.Controller
 }
 
 func NewAlbumPage(
 	albumID string,
 	cfg *backend.AlbumPageConfig,
-	sm *backend.ServerManager,
 	pm *backend.PlaybackManager,
-	lm *backend.LibraryManager,
+	mp mediaprovider.MediaProvider,
 	im *backend.ImageManager,
 	contr *controller.Controller,
 ) *AlbumPage {
@@ -55,9 +52,8 @@ func NewAlbumPage(
 		albumPageState: albumPageState{
 			albumID: albumID,
 			cfg:     cfg,
-			sm:      sm,
 			pm:      pm,
-			lm:      lm,
+			mp:      mp,
 			im:      im,
 			contr:   contr,
 		},
@@ -92,11 +88,11 @@ func (a *AlbumPage) Route() controller.Route {
 	return controller.AlbumRoute(a.albumID)
 }
 
-func (a *AlbumPage) OnSongChange(song *subsonic.Child, lastScrobbledIfAny *subsonic.Child) {
-	if song == nil {
+func (a *AlbumPage) OnSongChange(track, lastScrobbledIfAny *mediaprovider.Track) {
+	if track == nil {
 		a.nowPlayingID = ""
 	} else {
-		a.nowPlayingID = song.ID
+		a.nowPlayingID = track.ID
 	}
 	a.tracklist.SetNowPlaying(a.nowPlayingID)
 	a.tracklist.IncrementPlayCount(sharedutil.TrackIDOrEmptyStr(lastScrobbledIfAny))
@@ -116,14 +112,14 @@ func (a *AlbumPage) SelectAll() {
 
 // should be called asynchronously
 func (a *AlbumPage) load() {
-	album, err := a.lm.GetAlbum(a.albumID)
+	album, err := a.mp.GetAlbum(a.albumID)
 	if err != nil {
 		log.Printf("Failed to get album: %s", err.Error())
 		return
 	}
 	a.header.Update(album, a.im)
-	a.tracklist.ShowDiscNumber = album.Song[0].DiscNumber != album.Song[len(album.Song)-1].DiscNumber
-	a.tracklist.Tracks = album.Song
+	a.tracklist.ShowDiscNumber = album.Tracks[0].DiscNumber != album.Tracks[len(album.Tracks)-1].DiscNumber
+	a.tracklist.Tracks = album.Tracks
 	a.tracklist.SetNowPlaying(a.nowPlayingID)
 }
 
@@ -215,20 +211,20 @@ func (a *AlbumPageHeader) CreateRenderer() fyne.WidgetRenderer {
 	return widget.NewSimpleRenderer(a.container)
 }
 
-func (a *AlbumPageHeader) Update(album *subsonic.AlbumID3, im *backend.ImageManager) {
+func (a *AlbumPageHeader) Update(album *mediaprovider.AlbumWithTracks, im *backend.ImageManager) {
 	a.albumID = album.ID
-	a.coverID = album.CoverArt
-	a.artistID = album.ArtistID
+	a.coverID = album.CoverArtID
+	a.artistID = album.ArtistIDs[0]
 	a.titleLabel.Segments[0].(*widget.TextSegment).Text = album.Name
-	a.artistLabel.SetText(album.Artist)
-	a.genre = album.Genre
-	a.genreLabel.SetText(album.Genre)
+	a.artistLabel.SetText(album.ArtistNames[0])
+	a.genre = album.Genres[0]
+	a.genreLabel.SetText(album.Genres[0])
 	a.miscLabel.SetText(formatMiscLabelStr(album))
-	a.toggleFavButton.IsFavorited = !album.Starred.IsZero()
+	a.toggleFavButton.IsFavorited = album.Favorite
 	a.Refresh()
 
 	go func() {
-		if cover, err := im.GetCoverThumbnail(album.CoverArt); err == nil {
+		if cover, err := im.GetCoverThumbnail(album.CoverArtID); err == nil {
 			a.cover.Image.Image = cover
 			a.cover.Refresh()
 		} else {
@@ -238,11 +234,8 @@ func (a *AlbumPageHeader) Update(album *subsonic.AlbumID3, im *backend.ImageMana
 }
 
 func (a *AlbumPageHeader) toggleFavorited() {
-	if a.toggleFavButton.IsFavorited {
-		a.page.sm.Server.Star(subsonic.StarParameters{AlbumIDs: []string{a.albumID}})
-	} else {
-		a.page.sm.Server.Unstar(subsonic.StarParameters{AlbumIDs: []string{a.albumID}})
-	}
+	params := mediaprovider.RatingFavoriteParameters{AlbumIDs: []string{a.albumID}}
+	a.page.mp.SetFavorite(params, a.toggleFavButton.IsFavorited)
 }
 
 func (a *AlbumPageHeader) showPopUpCover() {
@@ -254,18 +247,18 @@ func (a *AlbumPageHeader) showPopUpCover() {
 	a.page.contr.ShowPopUpImage(cover)
 }
 
-func formatMiscLabelStr(a *subsonic.AlbumID3) string {
+func formatMiscLabelStr(a *mediaprovider.AlbumWithTracks) string {
 	var discs string
-	if discCount := a.Song[len(a.Song)-1].DiscNumber; discCount > 1 {
+	if discCount := a.Tracks[len(a.Tracks)-1].DiscNumber; discCount > 1 {
 		discs = fmt.Sprintf("%d discs · ", discCount)
 	}
 	tracks := "tracks"
-	if a.SongCount == 1 {
+	if a.TrackCount == 1 {
 		tracks = "track"
 	}
-	return fmt.Sprintf("%d · %d %s · %s%s", a.Year, a.SongCount, tracks, discs, util.SecondsToTimeString(float64(a.Duration)))
+	return fmt.Sprintf("%d · %d %s · %s%s", a.Year, a.TrackCount, tracks, discs, util.SecondsToTimeString(float64(a.Duration)))
 }
 
 func (s *albumPageState) Restore() Page {
-	return NewAlbumPage(s.albumID, s.cfg, s.sm, s.pm, s.lm, s.im, s.contr)
+	return NewAlbumPage(s.albumID, s.cfg, s.pm, s.mp, s.im, s.contr)
 }

ui/browsing/albumspage.go

@@ -2,6 +2,7 @@ package browsing
 
 import (
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/util"
@@ -23,13 +24,13 @@ type AlbumsPage struct {
 	contr      *controller.Controller
 	pm         *backend.PlaybackManager
 	im         *backend.ImageManager
-	lm         *backend.LibraryManager
+	mp         mediaprovider.MediaProvider
 	grid       *widgets.GridView
 	searchGrid *widgets.GridView
 	searcher   *widgets.SearchEntry
 	filterBtn  *widgets.AlbumFilterButton
 	searchText string
-	filter     backend.AlbumFilter
+	filter     mediaprovider.AlbumFilter
 	titleDisp  *widget.RichText
 	sortOrder  *selectWidget
 	container  *fyne.Container
@@ -54,12 +55,12 @@ func (s *selectWidget) MinSize() fyne.Size {
 	return fyne.NewSize(170, s.Select.MinSize().Height)
 }
 
-func NewAlbumsPage(cfg *backend.AlbumsPageConfig, contr *controller.Controller, pm *backend.PlaybackManager, lm *backend.LibraryManager, im *backend.ImageManager) *AlbumsPage {
+func NewAlbumsPage(cfg *backend.AlbumsPageConfig, contr *controller.Controller, pm *backend.PlaybackManager, mp mediaprovider.MediaProvider, im *backend.ImageManager) *AlbumsPage {
 	a := &AlbumsPage{
 		cfg:   cfg,
 		contr: contr,
 		pm:    pm,
-		lm:    lm,
+		mp:    mp,
 		im:    im,
 	}
 	a.ExtendBaseWidget(a)
@@ -68,12 +69,12 @@ func NewAlbumsPage(cfg *backend.AlbumsPageConfig, contr *controller.Controller,
 	a.titleDisp.Segments[0].(*widget.TextSegment).Style = widget.RichTextStyle{
 		SizeName: theme.SizeNameHeadingText,
 	}
-	a.sortOrder = NewSelect(backend.AlbumSortOrders, a.onSortOrderChanged)
-	if !sharedutil.SliceContains(backend.AlbumSortOrders, cfg.SortOrder) {
-		cfg.SortOrder = string(backend.AlbumSortRecentlyAdded)
+	a.sortOrder = NewSelect(mp.AlbumSortOrders(), a.onSortOrderChanged)
+	if !sharedutil.SliceContains(mp.AlbumSortOrders(), cfg.SortOrder) {
+		cfg.SortOrder = string(mp.AlbumSortOrders()[0])
 	}
 	a.sortOrder.Selected = cfg.SortOrder
-	iter := lm.AlbumsIter(backend.AlbumSortOrder(a.sortOrder.Selected), a.filter)
+	iter := mp.IterateAlbums(a.sortOrder.Selected, a.filter)
 	a.grid = widgets.NewGridView(widgets.NewGridViewAlbumIterator(iter), im)
 	contr.ConnectAlbumGridActions(a.grid)
 	a.createSearchAndFilter()
@@ -111,7 +112,7 @@ func restoreAlbumsPage(saved *savedAlbumsPage) *AlbumsPage {
 		cfg:        saved.cfg,
 		contr:      saved.contr,
 		pm:         saved.pm,
-		lm:         saved.lm,
+		mp:         saved.mp,
 		im:         saved.im,
 		searchText: saved.searchText,
 		filter:     saved.filter,
@@ -122,7 +123,7 @@ func restoreAlbumsPage(saved *savedAlbumsPage) *AlbumsPage {
 	a.titleDisp.Segments[0].(*widget.TextSegment).Style = widget.RichTextStyle{
 		SizeName: theme.SizeNameHeadingText,
 	}
-	a.sortOrder = NewSelect(backend.AlbumSortOrders, nil)
+	a.sortOrder = NewSelect(a.mp.AlbumSortOrders(), nil)
 	a.sortOrder.Selected = saved.sortOrder
 	a.sortOrder.OnChanged = a.onSortOrderChanged
 	a.grid = widgets.NewGridViewFromState(saved.gridState)
@@ -162,7 +163,7 @@ func (a *AlbumsPage) Reload() {
 	if a.searchText != "" {
 		a.doSearch(a.searchText)
 	} else {
-		iter := a.lm.AlbumsIter(backend.AlbumSortOrder(a.sortOrder.Selected), a.filter)
+		iter := a.mp.IterateAlbums(a.sortOrder.Selected, a.filter)
 		a.grid.Reset(widgets.NewGridViewAlbumIterator(iter))
 		a.grid.Refresh()
 	}
@@ -173,7 +174,7 @@ func (a *AlbumsPage) Save() SavedPage {
 		cfg:        a.cfg,
 		contr:      a.contr,
 		pm:         a.pm,
-		lm:         a.lm,
+		mp:         a.mp,
 		im:         a.im,
 		searchText: a.searchText,
 		filter:     a.filter,
@@ -187,11 +188,12 @@ func (a *AlbumsPage) Save() SavedPage {
 }
 
 func (a *AlbumsPage) doSearch(query string) {
+	iter := widgets.NewGridViewAlbumIterator(a.mp.SearchAlbums(query, a.filter))
 	if a.searchGrid == nil {
-		a.searchGrid = widgets.NewGridView(widgets.NewGridViewAlbumIterator(a.lm.SearchIter(query)), a.im)
+		a.searchGrid = widgets.NewGridView(iter, a.im)
 		a.contr.ConnectAlbumGridActions(a.searchGrid)
 	} else {
-		a.searchGrid.Reset(widgets.NewGridViewAlbumIterator(a.lm.SearchIterWithFilter(query, a.filter)))
+		a.searchGrid.Reset(iter)
 	}
 	a.container.Objects[0] = a.searchGrid
 	a.Refresh()
@@ -199,7 +201,7 @@ func (a *AlbumsPage) doSearch(query string) {
 
 func (a *AlbumsPage) onSortOrderChanged(order string) {
 	a.cfg.SortOrder = a.sortOrder.Selected
-	iter := a.lm.AlbumsIter(backend.AlbumSortOrder(order), a.filter)
+	iter := a.mp.IterateAlbums(order, a.filter)
 	a.grid.Reset(widgets.NewGridViewAlbumIterator(iter))
 	if a.searchText == "" {
 		a.container.Objects[0] = a.grid
@@ -214,11 +216,11 @@ func (a *AlbumsPage) CreateRenderer() fyne.WidgetRenderer {
 
 type savedAlbumsPage struct {
 	searchText      string
-	filter          backend.AlbumFilter
+	filter          mediaprovider.AlbumFilter
 	cfg             *backend.AlbumsPageConfig
 	contr           *controller.Controller
 	pm              *backend.PlaybackManager
-	lm              *backend.LibraryManager
+	mp              mediaprovider.MediaProvider
 	im              *backend.ImageManager
 	sortOrder       string
 	gridState       widgets.GridViewState

ui/browsing/artistpage.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/res"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
@@ -19,8 +20,6 @@ import (
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 var _ fyne.Widget = (*ArtistPage)(nil)
@@ -31,7 +30,7 @@ type artistPageState struct {
 
 	cfg   *backend.ArtistPageConfig
 	pm    *backend.PlaybackManager
-	sm    *backend.ServerManager
+	mp    mediaprovider.MediaProvider
 	im    *backend.ImageManager
 	contr *controller.Controller
 }
@@ -41,7 +40,7 @@ type ArtistPage struct {
 
 	artistPageState
 
-	artistInfo *subsonic.ArtistID3
+	artistInfo *mediaprovider.ArtistWithAlbums
 
 	albumGrid    *widgets.GridView
 	tracklistCtr *fyne.Container
@@ -50,20 +49,20 @@ type ArtistPage struct {
 	container    *fyne.Container
 }
 
-func NewArtistPage(artistID string, cfg *backend.ArtistPageConfig, pm *backend.PlaybackManager, sm *backend.ServerManager, im *backend.ImageManager, contr *controller.Controller) *ArtistPage {
+func NewArtistPage(artistID string, cfg *backend.ArtistPageConfig, pm *backend.PlaybackManager, mp mediaprovider.MediaProvider, im *backend.ImageManager, contr *controller.Controller) *ArtistPage {
 	activeView := 0
 	if cfg.InitialView == "Top Tracks" {
 		activeView = 1
 	}
-	return newArtistPage(artistID, cfg, pm, sm, im, contr, activeView)
+	return newArtistPage(artistID, cfg, pm, mp, im, contr, activeView)
 }
 
-func newArtistPage(artistID string, cfg *backend.ArtistPageConfig, pm *backend.PlaybackManager, sm *backend.ServerManager, im *backend.ImageManager, contr *controller.Controller, activeView int) *ArtistPage {
+func newArtistPage(artistID string, cfg *backend.ArtistPageConfig, pm *backend.PlaybackManager, mp mediaprovider.MediaProvider, im *backend.ImageManager, contr *controller.Controller, activeView int) *ArtistPage {
 	a := &ArtistPage{artistPageState: artistPageState{
 		artistID:   artistID,
 		cfg:        cfg,
 		pm:         pm,
-		sm:         sm,
+		mp:         mp,
 		im:         im,
 		contr:      contr,
 		activeView: activeView,
@@ -118,7 +117,7 @@ func (a *ArtistPage) Save() SavedPage {
 
 var _ CanShowNowPlaying = (*ArtistPage)(nil)
 
-func (a *ArtistPage) OnSongChange(track *subsonic.Child, lastScrobbledIfAny *subsonic.Child) {
+func (a *ArtistPage) OnSongChange(track, lastScrobbledIfAny *mediaprovider.Track) {
 	a.nowPlayingID = sharedutil.TrackIDOrEmptyStr(track)
 	if a.tracklistCtr != nil {
 		tl := a.tracklistCtr.Objects[0].(*widgets.Tracklist)
@@ -129,7 +128,7 @@ func (a *ArtistPage) OnSongChange(track *subsonic.Child, lastScrobbledIfAny *sub
 
 func (a *ArtistPage) playAllTracks() {
 	if a.artistInfo != nil { // page loaded
-		for i, album := range a.artistInfo.Album {
+		for i, album := range a.artistInfo.Albums {
 			a.pm.LoadAlbum(album.ID, i > 0 /*append*/, false /*shuffle*/)
 		}
 		a.pm.PlayFromBeginning()
@@ -142,7 +141,7 @@ func (a *ArtistPage) playArtistRadio() {
 
 // should be called asynchronously
 func (a *ArtistPage) load() {
-	artist, err := a.sm.Server.GetArtist(a.artistID)
+	artist, err := a.mp.GetArtist(a.artistID)
 	if err != nil {
 		log.Printf("Failed to get artist: %s", err.Error())
 		return
@@ -154,7 +153,7 @@ func (a *ArtistPage) load() {
 	} else {
 		a.showTopTracks()
 	}
-	info, err := a.sm.Server.GetArtistInfo2(a.artistID, nil)
+	info, err := a.mp.GetArtistInfo(a.artistID)
 	if err != nil {
 		log.Printf("Failed to get artist info: %s", err.Error())
 	}
@@ -168,11 +167,11 @@ func (a *ArtistPage) showAlbumGrid() {
 			a.activeView = 0 // if page still loading, will show discography view first
 			return
 		}
-		model := sharedutil.MapSlice(a.artistInfo.Album, func(al *subsonic.AlbumID3) widgets.GridViewItemModel {
+		model := sharedutil.MapSlice(a.artistInfo.Albums, func(al *mediaprovider.Album) widgets.GridViewItemModel {
 			return widgets.GridViewItemModel{
 				Name:       al.Name,
 				ID:         al.ID,
-				CoverArtID: al.CoverArt,
+				CoverArtID: al.CoverArtID,
 				Secondary:  strconv.Itoa(al.Year),
 			}
 		})
@@ -190,7 +189,7 @@ func (a *ArtistPage) showTopTracks() {
 			a.activeView = 1 // if page still loading, will show tracks view first
 			return
 		}
-		ts, err := a.sm.Server.GetTopSongs(a.artistInfo.Name, map[string]string{"count": "20"})
+		ts, err := a.mp.GetTopTracks(a.artistInfo.Artist, 20)
 		if err != nil {
 			log.Printf("error getting top songs: %s", err.Error())
 			return
@@ -233,7 +232,7 @@ func (a *ArtistPage) CreateRenderer() fyne.WidgetRenderer {
 }
 
 func (s *artistPageState) Restore() Page {
-	return newArtistPage(s.artistID, s.cfg, s.pm, s.sm, s.im, s.contr, s.activeView)
+	return newArtistPage(s.artistID, s.cfg, s.pm, s.mp, s.im, s.contr, s.activeView)
 }
 
 type ArtistPageHeader struct {
@@ -276,18 +275,18 @@ func NewArtistPageHeader(page *ArtistPage) *ArtistPageHeader {
 	return a
 }
 
-func (a *ArtistPageHeader) Update(artist *subsonic.ArtistID3) {
+func (a *ArtistPageHeader) Update(artist *mediaprovider.ArtistWithAlbums) {
 	if artist == nil {
 		return
 	}
-	a.favoriteBtn.IsFavorited = !artist.Starred.IsZero()
+	a.favoriteBtn.IsFavorited = !artist.Favorite
 	a.favoriteBtn.Refresh()
 	a.artistID = artist.ID
 	a.titleDisp.Segments[0].(*widget.TextSegment).Text = artist.Name
 	a.titleDisp.Refresh()
 }
 
-func (a *ArtistPageHeader) UpdateInfo(info *subsonic.ArtistInfo2) {
+func (a *ArtistPageHeader) UpdateInfo(info *mediaprovider.ArtistInfo) {
 	if info == nil {
 		return
 	}
@@ -303,7 +302,7 @@ func (a *ArtistPageHeader) UpdateInfo(info *subsonic.ArtistInfo2) {
 	}
 
 	a.similarArtists.RemoveAll()
-	for i, art := range info.SimilarArtist {
+	for i, art := range info.SimilarArtists {
 		if i == 0 {
 			a.similarArtists.Add(widget.NewLabel("Similar Artists:"))
 		}
@@ -320,11 +319,11 @@ func (a *ArtistPageHeader) UpdateInfo(info *subsonic.ArtistInfo2) {
 	}
 	a.similarArtists.Refresh()
 
-	if info.LargeImageUrl != "" {
+	if info.ImageURL != "" {
 		if a.artistImage.HaveImage() {
-			_ = a.artistPage.im.RefreshCachedArtistImageIfExpired(a.artistID, info.LargeImageUrl)
+			_ = a.artistPage.im.RefreshCachedArtistImageIfExpired(a.artistID, info.ImageURL)
 		} else {
-			im, err := a.artistPage.im.FetchAndCacheArtistImage(a.artistID, info.LargeImageUrl)
+			im, err := a.artistPage.im.FetchAndCacheArtistImage(a.artistID, info.ImageURL)
 			if err == nil {
 				a.artistImage.SetImage(im, true /*tappable*/)
 			}
@@ -333,11 +332,8 @@ func (a *ArtistPageHeader) UpdateInfo(info *subsonic.ArtistInfo2) {
 }
 
 func (a *ArtistPageHeader) toggleFavorited() {
-	if a.favoriteBtn.IsFavorited {
-		a.artistPage.sm.Server.Star(subsonic.StarParameters{ArtistIDs: []string{a.artistID}})
-	} else {
-		a.artistPage.sm.Server.Unstar(subsonic.StarParameters{ArtistIDs: []string{a.artistID}})
-	}
+	params := mediaprovider.RatingFavoriteParameters{ArtistIDs: []string{a.artistID}}
+	a.artistPage.mp.SetFavorite(params, a.favoriteBtn.IsFavorited)
 }
 
 func (a *ArtistPageHeader) createContainer() {

ui/browsing/artistsgenrespage.go

@@ -3,9 +3,8 @@ package browsing
 import (
 	"log"
 	"strings"
-	"time"
 
-	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
@@ -16,8 +15,6 @@ import (
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 var _ fyne.Widget = (*ArtistPage)(nil)
@@ -27,7 +24,7 @@ type ArtistsGenresPage struct {
 
 	isGenresPage bool
 	contr        *controller.Controller
-	sm           *backend.ServerManager
+	mp           mediaprovider.MediaProvider
 	model        []widgets.ArtistGenreListItemModel
 	list         *widgets.ArtistGenreList
 
@@ -36,11 +33,11 @@ type ArtistsGenresPage struct {
 	searcher  *widgets.SearchEntry
 }
 
-func NewArtistsGenresPage(isGenresPage bool, contr *controller.Controller, sm *backend.ServerManager) *ArtistsGenresPage {
-	return newArtistsGenresPage(isGenresPage, contr, sm, "")
+func NewArtistsGenresPage(isGenresPage bool, contr *controller.Controller, mp mediaprovider.MediaProvider) *ArtistsGenresPage {
+	return newArtistsGenresPage(isGenresPage, contr, mp, "")
 }
 
-func newArtistsGenresPage(isGenresPage bool, contr *controller.Controller, sm *backend.ServerManager, searchText string) *ArtistsGenresPage {
+func newArtistsGenresPage(isGenresPage bool, contr *controller.Controller, mp mediaprovider.MediaProvider, searchText string) *ArtistsGenresPage {
 	title := "Artists"
 	if isGenresPage {
 		title = "Genres"
@@ -48,7 +45,7 @@ func newArtistsGenresPage(isGenresPage bool, contr *controller.Controller, sm *b
 	a := &ArtistsGenresPage{
 		isGenresPage: isGenresPage,
 		contr:        contr,
-		sm:           sm,
+		mp:           mp,
 		titleDisp:    widget.NewRichTextWithText(title),
 	}
 	a.ExtendBaseWidget(a)
@@ -74,13 +71,13 @@ func newArtistsGenresPage(isGenresPage bool, contr *controller.Controller, sm *b
 // should be called asynchronously
 func (a *ArtistsGenresPage) load(searchOnLoad bool) {
 	if a.isGenresPage {
-		genres, err := a.sm.Server.GetGenres()
+		genres, err := a.mp.GetGenres()
 		if err != nil {
 			log.Printf("error loading genres: %v", err.Error())
 		}
 		a.model = a.buildGenresListModel(genres)
 	} else {
-		artists, err := a.sm.Server.GetArtists(nil)
+		artists, err := a.mp.GetArtists()
 		if err != nil {
 			log.Printf("error loading artists: %v", err.Error())
 		}
@@ -129,7 +126,7 @@ func (a *ArtistsGenresPage) Save() SavedPage {
 	return &savedArtistsGenresPage{
 		isGenresPage: a.isGenresPage,
 		contr:        a.contr,
-		sm:           a.sm,
+		mp:           a.mp,
 		searchText:   a.searcher.Entry.Text,
 	}
 }
@@ -137,37 +134,35 @@ func (a *ArtistsGenresPage) Save() SavedPage {
 type savedArtistsGenresPage struct {
 	isGenresPage bool
 	contr        *controller.Controller
-	sm           *backend.ServerManager
+	mp           mediaprovider.MediaProvider
 	searchText   string
 }
 
 func (s *savedArtistsGenresPage) Restore() Page {
-	return newArtistsGenresPage(s.isGenresPage, s.contr, s.sm, s.searchText)
+	return newArtistsGenresPage(s.isGenresPage, s.contr, s.mp, s.searchText)
 }
 
-func (a *ArtistsGenresPage) buildArtistListModel(artists *subsonic.ArtistsID3) []widgets.ArtistGenreListItemModel {
+func (a *ArtistsGenresPage) buildArtistListModel(artists []*mediaprovider.Artist) []widgets.ArtistGenreListItemModel {
 	model := make([]widgets.ArtistGenreListItemModel, 0)
-	for _, idx := range artists.Index {
-		for _, artist := range idx.Artist {
-			model = append(model, widgets.ArtistGenreListItemModel{
-				ID:         artist.ID,
-				Name:       artist.Name,
-				AlbumCount: artist.AlbumCount,
-				Favorite:   artist.Starred != time.Time{},
-			})
-		}
+	for _, artist := range artists {
+		model = append(model, widgets.ArtistGenreListItemModel{
+			ID:         artist.ID,
+			Name:       artist.Name,
+			AlbumCount: artist.AlbumCount,
+			Favorite:   artist.Favorite,
+		})
 	}
 	return model
 }
 
-func (a *ArtistsGenresPage) buildGenresListModel(genres []*subsonic.Genre) []widgets.ArtistGenreListItemModel {
+func (a *ArtistsGenresPage) buildGenresListModel(genres []*mediaprovider.Genre) []widgets.ArtistGenreListItemModel {
 	model := make([]widgets.ArtistGenreListItemModel, 0)
 	for _, genre := range genres {
 		model = append(model, widgets.ArtistGenreListItemModel{
 			ID:         genre.Name,
 			Name:       genre.Name,
 			AlbumCount: genre.AlbumCount,
-			TrackCount: genre.SongCount,
+			TrackCount: genre.TrackCount,
 			Favorite:   false,
 		})
 	}

ui/browsing/browsingpane.go

@@ -2,6 +2,7 @@ package browsing
 
 import (
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
 	myTheme "github.com/dweymouth/supersonic/ui/theme"
@@ -11,8 +12,6 @@ import (
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type Page interface {
@@ -37,7 +36,7 @@ type CanSelectAll interface {
 }
 
 type CanShowNowPlaying interface {
-	OnSongChange(song *subsonic.Child, lastScrobbledIfAny *subsonic.Child)
+	OnSongChange(song, lastScrobbledIfAny *mediaprovider.Track)
 }
 
 type BrowsingPane struct {
@@ -160,7 +159,7 @@ func (b *BrowsingPane) doSetPage(p Page) bool {
 	return true
 }
 
-func (b *BrowsingPane) onSongChange(song *subsonic.Child, lastScrobbledIfAny *subsonic.Child) {
+func (b *BrowsingPane) onSongChange(song, lastScrobbledIfAny *mediaprovider.Track) {
 	if b.curPage == nil {
 		return
 	}

ui/browsing/favoritespage.go

@@ -4,6 +4,7 @@ import (
 	"log"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
 	myTheme "github.com/dweymouth/supersonic/ui/theme"
@@ -15,8 +16,6 @@ import (
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type FavoritesPage struct {
@@ -26,10 +25,9 @@ type FavoritesPage struct {
 	contr *controller.Controller
 	pm    *backend.PlaybackManager
 	im    *backend.ImageManager
-	sm    *backend.ServerManager
-	lm    *backend.LibraryManager
+	mp    mediaprovider.MediaProvider
 
-	filter            backend.AlbumFilter
+	filter            mediaprovider.AlbumFilter
 	searchText        string
 	nowPlayingID      string
 	pendingViewSwitch bool
@@ -45,19 +43,18 @@ type FavoritesPage struct {
 	container     *fyne.Container
 }
 
-func NewFavoritesPage(cfg *backend.FavoritesPageConfig, contr *controller.Controller, sm *backend.ServerManager, pm *backend.PlaybackManager, lm *backend.LibraryManager, im *backend.ImageManager) *FavoritesPage {
+func NewFavoritesPage(cfg *backend.FavoritesPageConfig, contr *controller.Controller, mp mediaprovider.MediaProvider, pm *backend.PlaybackManager, im *backend.ImageManager) *FavoritesPage {
 	a := &FavoritesPage{
-		filter: backend.AlbumFilter{ExcludeUnfavorited: true},
+		filter: mediaprovider.AlbumFilter{ExcludeUnfavorited: true},
 		cfg:    cfg,
 		contr:  contr,
 		pm:     pm,
-		lm:     lm,
-		sm:     sm,
+		mp:     mp,
 		im:     im,
 	}
 	a.ExtendBaseWidget(a)
 	a.createHeader(0)
-	iter := lm.StarredIter(a.filter)
+	iter := mp.IterateAlbums("", a.filter)
 	a.grid = widgets.NewGridView(widgets.NewGridViewAlbumIterator(iter), a.im)
 	a.contr.ConnectAlbumGridActions(a.grid)
 	if cfg.InitialView == "Artists" {
@@ -101,8 +98,7 @@ func restoreFavoritesPage(saved *savedFavoritesPage) *FavoritesPage {
 		cfg:        saved.cfg,
 		contr:      saved.contr,
 		pm:         saved.pm,
-		lm:         saved.lm,
-		sm:         saved.sm,
+		mp:         saved.mp,
 		im:         saved.im,
 		searchText: saved.searchText,
 		filter:     saved.filter,
@@ -143,13 +139,13 @@ func (a *FavoritesPage) Reload() {
 	if a.searchText != "" {
 		a.doSearchAlbums(a.searchText)
 	} else {
-		iter := a.lm.StarredIter(a.filter)
+		iter := a.mp.IterateAlbums("", a.filter)
 		a.grid.Reset(widgets.NewGridViewAlbumIterator(iter))
 	}
 	if a.tracklistCtr != nil || a.artistListCtr != nil {
 		go func() {
 			// re-fetch starred info from server
-			starred, err := a.sm.Server.GetStarred2(nil)
+			starred, err := a.mp.GetFavorites()
 			if err != nil {
 				log.Printf("error getting starred items: %s", err.Error())
 				return
@@ -157,7 +153,7 @@ func (a *FavoritesPage) Reload() {
 			if a.tracklistCtr != nil {
 				// refresh favorite songs view
 				tr := a.tracklistCtr.Objects[0].(*widgets.Tracklist)
-				tr.Tracks = starred.Song
+				tr.Tracks = starred.Tracks
 				if a.toggleBtns.ActivatedButtonIndex() == 2 {
 					// favorite songs view is visible
 					tr.Refresh()
@@ -166,7 +162,7 @@ func (a *FavoritesPage) Reload() {
 			if a.artistListCtr != nil {
 				// refresh favorite artists view
 				al := a.artistListCtr.Objects[0].(*widgets.ArtistGenreList)
-				al.Items = buildArtistListModel(starred.Artist)
+				al.Items = buildArtistListModel(starred.Artists)
 				if a.toggleBtns.ActivatedButtonIndex() == 1 {
 					// favorite artists view is visible
 					al.Refresh()
@@ -181,9 +177,8 @@ func (a *FavoritesPage) Save() SavedPage {
 		cfg:             a.cfg,
 		contr:           a.contr,
 		pm:              a.pm,
-		sm:              a.sm,
+		mp:              a.mp,
 		im:              a.im,
-		lm:              a.lm,
 		filter:          a.filter,
 		searchText:      a.searchText,
 		gridState:       a.grid.SaveToState(),
@@ -216,7 +211,7 @@ func (a *FavoritesPage) OnSearched(query string) {
 
 var _ CanShowNowPlaying = (*FavoritesPage)(nil)
 
-func (a *FavoritesPage) OnSongChange(song *subsonic.Child, _ *subsonic.Child) {
+func (a *FavoritesPage) OnSongChange(song, _ *mediaprovider.Track) {
 	a.nowPlayingID = ""
 	if song != nil {
 		a.nowPlayingID = song.ID
@@ -235,7 +230,7 @@ func (a *FavoritesPage) SelectAll() {
 }
 
 func (a *FavoritesPage) doSearchAlbums(query string) {
-	iter := a.lm.SearchIterWithFilter(query, a.filter)
+	iter := a.mp.SearchAlbums(query, a.filter)
 	if a.searchGrid == nil {
 		a.searchGrid = widgets.NewGridView(widgets.NewGridViewAlbumIterator(iter), a.im)
 		a.contr.ConnectAlbumGridActions(a.searchGrid)
@@ -271,12 +266,12 @@ func (a *FavoritesPage) onShowFavoriteArtists() {
 			a.createContainer(layout.NewSpacer())
 		}
 		go func() {
-			s, err := a.sm.Server.GetStarred2(nil)
+			fav, err := a.mp.GetFavorites()
 			if err != nil {
 				log.Printf("error getting starred items: %s", err.Error())
 				return
 			}
-			model := buildArtistListModel(s.Artist)
+			model := buildArtistListModel(fav.Artists)
 			artistList := widgets.NewArtistGenreList(model)
 			artistList.ShowAlbumCount = true
 			artistList.OnNavTo = func(artistID string) {
@@ -295,7 +290,7 @@ func (a *FavoritesPage) onShowFavoriteArtists() {
 	}
 }
 
-func buildArtistListModel(artists []*subsonic.ArtistID3) []widgets.ArtistGenreListItemModel {
+func buildArtistListModel(artists []*mediaprovider.Artist) []widgets.ArtistGenreListItemModel {
 	model := make([]widgets.ArtistGenreListItemModel, 0)
 	for _, ar := range artists {
 		model = append(model, widgets.ArtistGenreListItemModel{
@@ -320,12 +315,12 @@ func (a *FavoritesPage) onShowFavoriteSongs() {
 			a.createContainer(layout.NewSpacer())
 		}
 		go func() {
-			s, err := a.sm.Server.GetStarred2(nil)
+			fav, err := a.mp.GetFavorites()
 			if err != nil {
 				log.Printf("error getting starred items: %s", err.Error())
 				return
 			}
-			tracklist := widgets.NewTracklist(s.Song)
+			tracklist := widgets.NewTracklist(fav.Tracks)
 			tracklist.AutoNumber = true
 			tracklist.SetVisibleColumns(a.cfg.TracklistColumns)
 			tracklist.OnVisibleColumnsChanged = func(cols []string) {
@@ -355,12 +350,11 @@ type savedFavoritesPage struct {
 	cfg             *backend.FavoritesPageConfig
 	contr           *controller.Controller
 	pm              *backend.PlaybackManager
-	sm              *backend.ServerManager
+	mp              mediaprovider.MediaProvider
 	im              *backend.ImageManager
-	lm              *backend.LibraryManager
 	gridState       widgets.GridViewState
 	searchGridState widgets.GridViewState
-	filter          backend.AlbumFilter
+	filter          mediaprovider.AlbumFilter
 	searchText      string
 	activeToggleBtn int
 }

ui/browsing/genrepage.go

@@ -2,6 +2,7 @@ package browsing
 
 import (
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/ui/controller"
 	myTheme "github.com/dweymouth/supersonic/ui/theme"
 	"github.com/dweymouth/supersonic/ui/util"
@@ -22,12 +23,12 @@ type GenrePage struct {
 	contr      *controller.Controller
 	im         *backend.ImageManager
 	pm         *backend.PlaybackManager
-	lm         *backend.LibraryManager
+	mp         mediaprovider.MediaProvider
 	grid       *widgets.GridView
 	searchGrid *widgets.GridView
 	searcher   *widgets.SearchEntry
 	searchText string
-	filter     backend.AlbumFilter
+	filter     mediaprovider.AlbumFilter
 	filterBtn  *widgets.AlbumFilterButton
 	titleDisp  *widget.RichText
 	playRandom *widget.Button
@@ -37,13 +38,13 @@ type GenrePage struct {
 	container *fyne.Container
 }
 
-func NewGenrePage(genre string, contr *controller.Controller, pm *backend.PlaybackManager, lm *backend.LibraryManager, im *backend.ImageManager) *GenrePage {
+func NewGenrePage(genre string, contr *controller.Controller, pm *backend.PlaybackManager, mp mediaprovider.MediaProvider, im *backend.ImageManager) *GenrePage {
 	g := &GenrePage{
 		genre:  genre,
-		filter: backend.AlbumFilter{Genres: []string{genre}},
+		filter: mediaprovider.AlbumFilter{Genres: []string{genre}},
 		contr:  contr,
 		pm:     pm,
-		lm:     lm,
+		mp:     mp,
 		im:     im,
 	}
 	g.ExtendBaseWidget(g)
@@ -53,7 +54,7 @@ func NewGenrePage(genre string, contr *controller.Controller, pm *backend.Playba
 		SizeName: theme.SizeNameHeadingText,
 	}
 	g.playRandom = widget.NewButtonWithIcon(" Play random", myTheme.ShuffleIcon, g.playRandomSongs)
-	iter := g.lm.GenreIter(g.genre, g.filter)
+	iter := g.mp.IterateAlbums("", g.filter)
 	g.grid = widgets.NewGridView(widgets.NewGridViewAlbumIterator(iter), g.im)
 	g.contr.ConnectAlbumGridActions(g.grid)
 	g.createSearchAndFilter()
@@ -90,7 +91,7 @@ func restoreGenrePage(saved *savedGenrePage) *GenrePage {
 		genre:      saved.genre,
 		contr:      saved.contr,
 		pm:         saved.pm,
-		lm:         saved.lm,
+		mp:         saved.mp,
 		im:         saved.im,
 		searchText: saved.searchText,
 		filter:     saved.filter,
@@ -124,7 +125,7 @@ func (g *GenrePage) Reload() {
 	if g.searchText != "" {
 		g.doSearch(g.searchText)
 	} else {
-		iter := g.lm.GenreIter(g.genre, g.filter)
+		iter := g.mp.IterateAlbums("", g.filter)
 		g.grid.Reset(widgets.NewGridViewAlbumIterator(iter))
 		g.grid.Refresh()
 	}
@@ -137,7 +138,7 @@ func (g *GenrePage) Save() SavedPage {
 		searchText: g.searchText,
 		contr:      g.contr,
 		pm:         g.pm,
-		lm:         g.lm,
+		mp:         g.mp,
 		im:         g.im,
 		gridState:  g.grid.SaveToState(),
 	}
@@ -167,7 +168,7 @@ func (g *GenrePage) OnSearched(query string) {
 }
 
 func (g *GenrePage) doSearch(query string) {
-	iter := g.lm.SearchIterWithFilter(query, g.filter)
+	iter := g.mp.SearchAlbums(query, g.filter)
 	if g.searchGrid == nil {
 		g.searchGrid = widgets.NewGridView(widgets.NewGridViewAlbumIterator(iter), g.im)
 		g.contr.ConnectAlbumGridActions(g.searchGrid)
@@ -185,10 +186,10 @@ func (g *GenrePage) playRandomSongs() {
 type savedGenrePage struct {
 	genre           string
 	searchText      string
-	filter          backend.AlbumFilter
+	filter          mediaprovider.AlbumFilter
 	contr           *controller.Controller
 	pm              *backend.PlaybackManager
-	lm              *backend.LibraryManager
+	mp              mediaprovider.MediaProvider
 	im              *backend.ImageManager
 	gridState       widgets.GridViewState
 	searchGridState widgets.GridViewState

ui/browsing/nowplayingpage.go

@@ -2,6 +2,7 @@ package browsing
 
 import (
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
@@ -10,8 +11,6 @@ import (
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type NowPlayingPage struct {
@@ -28,7 +27,6 @@ type NowPlayingPage struct {
 type nowPlayingPageState struct {
 	contr *controller.Controller
 	conf  *backend.NowPlayingPageConfig
-	sm    *backend.ServerManager
 	pm    *backend.PlaybackManager
 }
 
@@ -36,10 +34,9 @@ func NewNowPlayingPage(
 	highlightedTrackID string,
 	contr *controller.Controller,
 	conf *backend.NowPlayingPageConfig,
-	sm *backend.ServerManager,
 	pm *backend.PlaybackManager,
 ) *NowPlayingPage {
-	a := &NowPlayingPage{nowPlayingPageState: nowPlayingPageState{contr: contr, conf: conf, sm: sm, pm: pm}}
+	a := &NowPlayingPage{nowPlayingPageState: nowPlayingPageState{contr: contr, conf: conf, pm: pm}}
 	a.ExtendBaseWidget(a)
 	a.tracklist = widgets.NewTracklist(nil)
 	a.tracklist.SetVisibleColumns(conf.TracklistColumns)
@@ -83,7 +80,7 @@ func (a *NowPlayingPage) SelectAll() {
 	a.tracklist.SelectAll()
 }
 
-func (a *NowPlayingPage) OnSongChange(song *subsonic.Child, lastScrobbledIfAny *subsonic.Child) {
+func (a *NowPlayingPage) OnSongChange(song, lastScrobbledIfAny *mediaprovider.Track) {
 	if song == nil {
 		a.nowPlayingID = ""
 	} else {
@@ -118,5 +115,5 @@ func (a *NowPlayingPage) load(highlightedTrackID string) {
 }
 
 func (s *nowPlayingPageState) Restore() Page {
-	return NewNowPlayingPage("", s.contr, s.conf, s.sm, s.pm)
+	return NewNowPlayingPage("", s.contr, s.conf, s.pm)
 }

ui/browsing/playlistpage.go

@@ -5,6 +5,7 @@ import (
 	"log"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/res"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
@@ -17,8 +18,6 @@ import (
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type PlaylistPage struct {
@@ -90,7 +89,7 @@ func (a *PlaylistPage) Route() controller.Route {
 	return controller.PlaylistRoute(a.playlistID)
 }
 
-func (a *PlaylistPage) OnSongChange(song *subsonic.Child, lastScrobbledIfAny *subsonic.Child) {
+func (a *PlaylistPage) OnSongChange(song, lastScrobbledIfAny *mediaprovider.Track) {
 	if song == nil {
 		a.nowPlayingID = ""
 	} else {
@@ -119,7 +118,7 @@ func (a *PlaylistPage) load() {
 		log.Printf("Failed to get playlist: %s", err.Error())
 		return
 	}
-	a.tracklist.Tracks = playlist.Entry
+	a.tracklist.Tracks = playlist.Tracks
 	a.tracklist.SetNowPlaying(a.nowPlayingID)
 	a.tracklist.Refresh()
 	a.header.Update(playlist)
@@ -148,10 +147,7 @@ func (a *PlaylistPage) doSetNewTrackOrder(op sharedutil.TrackReorderOp) {
 	for i, tr := range newTracks {
 		ids[i] = tr.ID
 	}
-	err := a.sm.Server.CreatePlaylistWithTracks(ids, map[string]string{
-		"playlistId": a.playlistID,
-	})
-	if err != nil {
+	if err := a.sm.Server.ReplacePlaylistTracks(a.playlistID, ids); err != nil {
 		log.Printf("error updating playlist: %s", err.Error())
 	} else {
 		a.tracklist.Tracks = newTracks
@@ -161,7 +157,7 @@ func (a *PlaylistPage) doSetNewTrackOrder(op sharedutil.TrackReorderOp) {
 }
 
 func (a *PlaylistPage) onRemoveSelectedFromPlaylist() {
-	a.sm.Server.UpdatePlaylistTracks(a.playlistID, nil, a.tracklist.SelectedTrackIndexes())
+	a.sm.Server.EditPlaylistTracks(a.playlistID, nil, a.tracklist.SelectedTrackIndexes())
 	a.tracklist.UnselectAll()
 	go a.Reload()
 }
@@ -170,7 +166,7 @@ type PlaylistPageHeader struct {
 	widget.BaseWidget
 
 	page         *PlaylistPage
-	playlistInfo *subsonic.Playlist
+	playlistInfo *mediaprovider.PlaylistWithTracks
 	image        *widgets.ImagePlaceholder
 
 	editButton       *widget.Button
@@ -199,7 +195,7 @@ func NewPlaylistPageHeader(page *PlaylistPage) *PlaylistPageHeader {
 	a.trackTimeLabel = widget.NewLabel("")
 	a.editButton = widget.NewButtonWithIcon("Edit", theme.DocumentCreateIcon(), func() {
 		if a.playlistInfo != nil {
-			page.contr.DoEditPlaylistWorkflow(a.playlistInfo)
+			page.contr.DoEditPlaylistWorkflow(&a.playlistInfo.Playlist)
 		}
 	})
 	a.editButton.Hidden = true
@@ -244,18 +240,18 @@ func (a *PlaylistPageHeader) CreateRenderer() fyne.WidgetRenderer {
 	return widget.NewSimpleRenderer(a.container)
 }
 
-func (a *PlaylistPageHeader) Update(playlist *subsonic.Playlist) {
+func (a *PlaylistPageHeader) Update(playlist *mediaprovider.PlaylistWithTracks) {
 	a.playlistInfo = playlist
-	a.editButton.Hidden = playlist.Owner != a.page.sm.Server.User
+	a.editButton.Hidden = playlist.Owner != a.page.sm.LoggedInUser
 	a.titleLabel.Segments[0].(*widget.TextSegment).Text = playlist.Name
-	a.descriptionLabel.SetText(playlist.Comment)
+	a.descriptionLabel.SetText(playlist.Description)
 	a.ownerLabel.SetText(a.formatPlaylistOwnerStr(playlist))
 	a.trackTimeLabel.SetText(a.formatPlaylistTrackTimeStr(playlist))
 	a.createdAtLabel.SetText("created at TODO")
 
 	var haveCover bool
-	if playlist.CoverArt != "" {
-		if im, err := a.page.im.GetCoverThumbnail(playlist.CoverArt); err == nil && im != nil {
+	if playlist.CoverArtID != "" {
+		if im, err := a.page.im.GetCoverThumbnail(playlist.CoverArtID); err == nil && im != nil {
 			a.image.SetImage(im, false /*tappable*/)
 			haveCover = true
 		}
@@ -268,7 +264,7 @@ func (a *PlaylistPageHeader) Update(playlist *subsonic.Playlist) {
 	a.Refresh()
 }
 
-func (a *PlaylistPageHeader) formatPlaylistOwnerStr(p *subsonic.Playlist) string {
+func (a *PlaylistPageHeader) formatPlaylistOwnerStr(p *mediaprovider.PlaylistWithTracks) string {
 	pubPriv := "Public"
 	if !p.Public {
 		pubPriv = "Private"
@@ -276,12 +272,12 @@ func (a *PlaylistPageHeader) formatPlaylistOwnerStr(p *subsonic.Playlist) string
 	return fmt.Sprintf("%s playlist by %s", pubPriv, p.Owner)
 }
 
-func (a *PlaylistPageHeader) formatPlaylistTrackTimeStr(p *subsonic.Playlist) string {
+func (a *PlaylistPageHeader) formatPlaylistTrackTimeStr(p *mediaprovider.PlaylistWithTracks) string {
 	tracks := "tracks"
-	if p.SongCount == 1 {
+	if p.TrackCount == 1 {
 		tracks = "track"
 	}
-	return fmt.Sprintf("%d %s, %s", p.SongCount, tracks, util.SecondsToTimeString(float64(p.Duration)))
+	return fmt.Sprintf("%d %s, %s", p.TrackCount, tracks, util.SecondsToTimeString(float64(p.Duration)))
 }
 
 func (s *playlistPageState) Restore() Page {

ui/browsing/playlistspage.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/res"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
@@ -18,8 +19,6 @@ import (
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type PlaylistsPage struct {
@@ -27,9 +26,9 @@ type PlaylistsPage struct {
 
 	cfg               *backend.PlaylistsPageConfig
 	contr             *controller.Controller
-	sm                *backend.ServerManager
-	playlists         []*subsonic.Playlist
-	searchedPlaylists []*subsonic.Playlist
+	mp                mediaprovider.MediaProvider
+	playlists         []*mediaprovider.Playlist
+	searchedPlaylists []*mediaprovider.Playlist
 
 	viewToggle *widgets.ToggleButtonGroup
 	searcher   *widgets.SearchEntry
@@ -39,18 +38,18 @@ type PlaylistsPage struct {
 	gridView   *widgets.GridView
 }
 
-func NewPlaylistsPage(contr *controller.Controller, cfg *backend.PlaylistsPageConfig, sm *backend.ServerManager) *PlaylistsPage {
+func NewPlaylistsPage(contr *controller.Controller, cfg *backend.PlaylistsPageConfig, mp mediaprovider.MediaProvider) *PlaylistsPage {
 	activeView := 0
 	if cfg.InitialView == "Grid" {
 		activeView = 1
 	}
-	return newPlaylistsPage(contr, cfg, sm, "", activeView)
+	return newPlaylistsPage(contr, cfg, mp, "", activeView)
 }
 
-func newPlaylistsPage(contr *controller.Controller, cfg *backend.PlaylistsPageConfig, sm *backend.ServerManager, searchText string, activeView int) *PlaylistsPage {
+func newPlaylistsPage(contr *controller.Controller, cfg *backend.PlaylistsPageConfig, mp mediaprovider.MediaProvider, searchText string, activeView int) *PlaylistsPage {
 	a := &PlaylistsPage{
 		cfg:       cfg,
-		sm:        sm,
+		mp:        mp,
 		contr:     contr,
 		titleDisp: widget.NewRichTextWithText("Playlists"),
 	}
@@ -76,7 +75,7 @@ func newPlaylistsPage(contr *controller.Controller, cfg *backend.PlaylistsPageCo
 }
 
 func (a *PlaylistsPage) load(searchOnLoad bool) {
-	playlists, err := a.sm.Server.GetPlaylists(nil)
+	playlists, err := a.mp.GetPlaylists()
 	if err != nil {
 		log.Printf("error loading playlists: %v", err.Error())
 	}
@@ -93,7 +92,7 @@ func (a *PlaylistsPage) createListView() {
 	a.listView.OnNavTo = a.showPlaylistPage
 }
 
-func (a *PlaylistsPage) createGridView(playlists []*subsonic.Playlist) {
+func (a *PlaylistsPage) createGridView(playlists []*mediaprovider.Playlist) {
 	model := createPlaylistGridViewModel(playlists)
 	a.gridView = widgets.NewFixedGridView(model, a.contr.App.ImageManager)
 	a.gridView.OnPlay = func(id string, shuffle bool) {
@@ -110,7 +109,7 @@ func (a *PlaylistsPage) createGridView(playlists []*subsonic.Playlist) {
 				log.Printf("error loading playlist: %s", err.Error())
 				return
 			}
-			a.contr.DoAddTracksToPlaylistWorkflow(sharedutil.TracksToIDs(pl.Entry))
+			a.contr.DoAddTracksToPlaylistWorkflow(sharedutil.TracksToIDs(pl.Tracks))
 		}()
 	}
 }
@@ -142,17 +141,17 @@ func (a *PlaylistsPage) showGridView() {
 	a.container.Objects[0].Refresh()
 }
 
-func createPlaylistGridViewModel(playlists []*subsonic.Playlist) []widgets.GridViewItemModel {
-	return sharedutil.MapSlice(playlists, func(pl *subsonic.Playlist) widgets.GridViewItemModel {
+func createPlaylistGridViewModel(playlists []*mediaprovider.Playlist) []widgets.GridViewItemModel {
+	return sharedutil.MapSlice(playlists, func(pl *mediaprovider.Playlist) widgets.GridViewItemModel {
 		tracks := "tracks"
-		if pl.SongCount == 1 {
+		if pl.TrackCount == 1 {
 			tracks = "track"
 		}
 		return widgets.GridViewItemModel{
 			Name:       pl.Name,
 			ID:         pl.ID,
-			CoverArtID: pl.CoverArt,
-			Secondary:  fmt.Sprintf("%d %s", pl.SongCount, tracks),
+			CoverArtID: pl.CoverArtID,
+			Secondary:  fmt.Sprintf("%d %s", pl.TrackCount, tracks),
 		}
 	})
 }
@@ -164,15 +163,15 @@ func (a *PlaylistsPage) showPlaylistPage(id string) {
 func (a *PlaylistsPage) onSearched(query string) {
 	// since the playlist list is returned in full non-paginated, we will do our own
 	// simple search based on the name, description, and owner, rather than calling a server API
-	var playlists []*subsonic.Playlist
+	var playlists []*mediaprovider.Playlist
 	if query == "" {
 		a.searchedPlaylists = nil
 		playlists = a.playlists
 	} else {
-		a.searchedPlaylists = sharedutil.FilterSlice(a.playlists, func(p *subsonic.Playlist) bool {
+		a.searchedPlaylists = sharedutil.FilterSlice(a.playlists, func(p *mediaprovider.Playlist) bool {
 			qLower := strings.ToLower(query)
 			return strings.Contains(strings.ToLower(p.Name), qLower) ||
-				strings.Contains(strings.ToLower(p.Comment), qLower) ||
+				strings.Contains(strings.ToLower(p.Description), qLower) ||
 				strings.Contains(strings.ToLower(p.Owner), qLower)
 		})
 		playlists = a.searchedPlaylists
@@ -182,7 +181,7 @@ func (a *PlaylistsPage) onSearched(query string) {
 
 // update the model for both views if initialized,
 // refresh the active view
-func (a *PlaylistsPage) refreshView(playlists []*subsonic.Playlist) {
+func (a *PlaylistsPage) refreshView(playlists []*mediaprovider.Playlist) {
 	if a.listView != nil {
 		a.listView.Playlists = playlists
 	}
@@ -214,7 +213,7 @@ func (a *PlaylistsPage) Save() SavedPage {
 	return &savedPlaylistsPage{
 		contr:      a.contr,
 		cfg:        a.cfg,
-		sm:         a.sm,
+		mp:         a.mp,
 		searchText: a.searcher.Entry.Text,
 		activeView: a.viewToggle.ActivatedButtonIndex(),
 	}
@@ -223,13 +222,13 @@ func (a *PlaylistsPage) Save() SavedPage {
 type savedPlaylistsPage struct {
 	contr      *controller.Controller
 	cfg        *backend.PlaylistsPageConfig
-	sm         *backend.ServerManager
+	mp         mediaprovider.MediaProvider
 	searchText string
 	activeView int
 }
 
 func (s *savedPlaylistsPage) Restore() Page {
-	return newPlaylistsPage(s.contr, s.cfg, s.sm, s.searchText, s.activeView)
+	return newPlaylistsPage(s.contr, s.cfg, s.mp, s.searchText, s.activeView)
 }
 
 func (a *PlaylistsPage) buildContainer(initialView fyne.CanvasObject) {
@@ -247,7 +246,7 @@ func (a *PlaylistsPage) CreateRenderer() fyne.WidgetRenderer {
 type PlaylistList struct {
 	widget.BaseWidget
 
-	Playlists []*subsonic.Playlist
+	Playlists []*mediaprovider.Playlist
 	OnNavTo   func(string)
 
 	columnsLayout *layouts.ColumnsLayout
@@ -274,9 +273,9 @@ func NewPlaylistList() *PlaylistList {
 			row := item.(*PlaylistListRow)
 			row.ID = a.Playlists[id].ID
 			row.nameLabel.Text = a.Playlists[id].Name
-			row.descrptionLabel.Text = a.Playlists[id].Comment
+			row.descrptionLabel.Text = a.Playlists[id].Description
 			row.ownerLabel.Text = a.Playlists[id].Owner
-			row.trackCountLabel.Text = strconv.Itoa(a.Playlists[id].SongCount)
+			row.trackCountLabel.Text = strconv.Itoa(a.Playlists[id].TrackCount)
 			row.Refresh()
 		},
 	)

ui/browsing/router.go

@@ -28,27 +28,27 @@ func NewRouter(app *backend.App, controller *controller.Controller, nav Navigati
 func (r Router) CreatePage(rte controller.Route) Page {
 	switch rte.Page {
 	case controller.Album:
-		return NewAlbumPage(rte.Arg, &r.App.Config.AlbumPage, r.App.ServerManager, r.App.PlaybackManager, r.App.LibraryManager, r.App.ImageManager, r.Controller)
+		return NewAlbumPage(rte.Arg, &r.App.Config.AlbumPage, r.App.PlaybackManager, r.App.ServerManager.Server, r.App.ImageManager, r.Controller)
 	case controller.Albums:
-		return NewAlbumsPage(&r.App.Config.AlbumsPage, r.Controller, r.App.PlaybackManager, r.App.LibraryManager, r.App.ImageManager)
+		return NewAlbumsPage(&r.App.Config.AlbumsPage, r.Controller, r.App.PlaybackManager, r.App.ServerManager.Server, r.App.ImageManager)
 	case controller.Artist:
-		return NewArtistPage(rte.Arg, &r.App.Config.ArtistPage, r.App.PlaybackManager, r.App.ServerManager, r.App.ImageManager, r.Controller)
+		return NewArtistPage(rte.Arg, &r.App.Config.ArtistPage, r.App.PlaybackManager, r.App.ServerManager.Server, r.App.ImageManager, r.Controller)
 	case controller.Artists:
-		return NewArtistsGenresPage(false, r.Controller, r.App.ServerManager)
+		return NewArtistsGenresPage(false, r.Controller, r.App.ServerManager.Server)
 	case controller.Favorites:
-		return NewFavoritesPage(&r.App.Config.FavoritesPage, r.Controller, r.App.ServerManager, r.App.PlaybackManager, r.App.LibraryManager, r.App.ImageManager)
+		return NewFavoritesPage(&r.App.Config.FavoritesPage, r.Controller, r.App.ServerManager.Server, r.App.PlaybackManager, r.App.ImageManager)
 	case controller.Genre:
-		return NewGenrePage(rte.Arg, r.Controller, r.App.PlaybackManager, r.App.LibraryManager, r.App.ImageManager)
+		return NewGenrePage(rte.Arg, r.Controller, r.App.PlaybackManager, r.App.ServerManager.Server, r.App.ImageManager)
 	case controller.Genres:
-		return NewArtistsGenresPage(true, r.Controller, r.App.ServerManager)
+		return NewArtistsGenresPage(true, r.Controller, r.App.ServerManager.Server)
 	case controller.NowPlaying:
-		return NewNowPlayingPage(rte.Arg, r.Controller, &r.App.Config.NowPlayingPage, r.App.ServerManager, r.App.PlaybackManager)
+		return NewNowPlayingPage(rte.Arg, r.Controller, &r.App.Config.NowPlayingPage, r.App.PlaybackManager)
 	case controller.Playlist:
 		return NewPlaylistPage(rte.Arg, &r.App.Config.PlaylistPage, r.Controller, r.App.ServerManager, r.App.PlaybackManager, r.App.ImageManager)
 	case controller.Playlists:
-		return NewPlaylistsPage(r.Controller, &r.App.Config.PlaylistsPage, r.App.ServerManager)
+		return NewPlaylistsPage(r.Controller, &r.App.Config.PlaylistsPage, r.App.ServerManager.Server)
 	case controller.Tracks:
-		return NewTracksPage(r.Controller, &r.App.Config.TracksPage, r.App.LibraryManager)
+		return NewTracksPage(r.Controller, &r.App.Config.TracksPage, r.App.ServerManager.Server)
 	}
 	return nil
 }

ui/browsing/trackspage.go

@@ -2,6 +2,7 @@ package browsing
 
 import (
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
@@ -12,8 +13,6 @@ import (
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type TracksPage struct {
@@ -37,11 +36,11 @@ type tracksPageState struct {
 	searchText string
 	contr      *controller.Controller
 	conf       *backend.TracksPageConfig
-	lm         *backend.LibraryManager
+	mp         mediaprovider.MediaProvider
 }
 
-func NewTracksPage(contr *controller.Controller, conf *backend.TracksPageConfig, lm *backend.LibraryManager) *TracksPage {
-	t := &TracksPage{tracksPageState: tracksPageState{contr: contr, conf: conf, lm: lm}}
+func NewTracksPage(contr *controller.Controller, conf *backend.TracksPageConfig, mp mediaprovider.MediaProvider) *TracksPage {
+	t := &TracksPage{tracksPageState: tracksPageState{contr: contr, conf: conf, mp: mp}}
 	t.ExtendBaseWidget(t)
 
 	t.tracklist = widgets.NewTracklist(nil)
@@ -79,12 +78,12 @@ func (t *TracksPage) Route() controller.Route {
 
 func (t *TracksPage) Reload() {
 	t.tracklist.Clear()
-	iter := t.lm.AllTracksIterator()
+	iter := t.mp.IterateTracks("")
 	// loads asynchronously
 	t.loader = widgets.NewTracklistLoader(t.tracklist, iter)
 }
 
-func (t *TracksPage) OnSongChange(track *subsonic.Child, lastScrobbledIfAny *subsonic.Child) {
+func (t *TracksPage) OnSongChange(track, lastScrobbledIfAny *mediaprovider.Track) {
 	t.nowPlayingID = sharedutil.TrackIDOrEmptyStr(track)
 	t.tracklist.SetNowPlaying(t.nowPlayingID)
 	if t.searchTracklist != nil {
@@ -130,7 +129,7 @@ func (t *TracksPage) doSearch(query string) {
 	} else {
 		t.searchTracklist.Clear()
 	}
-	iter := t.lm.SearchTracksIterator(query)
+	iter := t.mp.IterateTracks(query)
 	t.searchLoader = widgets.NewTracklistLoader(t.searchTracklist, iter)
 	t.container.Objects[0].(*fyne.Container).Objects[0] = t.searchTracklist
 	t.Refresh()
@@ -146,7 +145,7 @@ func (t *TracksPage) Save() SavedPage {
 }
 
 func (s *tracksPageState) Restore() Page {
-	t := NewTracksPage(s.contr, s.conf, s.lm)
+	t := NewTracksPage(s.contr, s.conf, s.mp)
 	t.searchText = s.searchText
 	if t.searchText != "" {
 		t.searcher.Entry.Text = t.searchText

ui/controller/controller.go

@@ -3,12 +3,10 @@ package controller
 import (
 	"image"
 	"log"
-	"math"
-	"strconv"
-	"sync"
 	"time"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/player"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/dialogs"
@@ -20,8 +18,6 @@ import (
 	"fyne.io/fyne/v2/dialog"
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/widget"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 type NavigationHandler func(Route)
@@ -94,14 +90,14 @@ func (m *Controller) ShowPopUpImage(img image.Image) {
 
 func (m *Controller) ConnectTracklistActions(tracklist *widgets.Tracklist) {
 	tracklist.OnAddToPlaylist = m.DoAddTracksToPlaylistWorkflow
-	tracklist.OnAddToQueue = func(tracks []*subsonic.Child) {
+	tracklist.OnAddToQueue = func(tracks []*mediaprovider.Track) {
 		m.App.PlaybackManager.LoadTracks(tracks, true, false)
 	}
 	tracklist.OnPlayTrackAt = func(idx int) {
 		m.App.PlaybackManager.LoadTracks(tracklist.Tracks, false, false)
 		m.App.PlaybackManager.PlayTrackAt(idx)
 	}
-	tracklist.OnPlaySelection = func(tracks []*subsonic.Child, shuffle bool) {
+	tracklist.OnPlaySelection = func(tracks []*mediaprovider.Track, shuffle bool) {
 		m.App.PlaybackManager.LoadTracks(tracks, false, shuffle)
 		m.App.PlaybackManager.PlayFromBeginning()
 	}
@@ -132,12 +128,14 @@ func (m *Controller) ConnectAlbumGridActions(grid *widgets.GridView) {
 		m.NavigateTo(ArtistRoute(artistID))
 	}
 	grid.OnAddToPlaylist = func(albumID string) {
-		album, err := m.App.ServerManager.Server.GetAlbum(albumID)
-		if err != nil {
-			log.Printf("error loading album: %s", err.Error())
-			return
-		}
-		m.DoAddTracksToPlaylistWorkflow(sharedutil.TracksToIDs(album.Song))
+		go func() {
+			album, err := m.App.ServerManager.Server.GetAlbum(albumID)
+			if err != nil {
+				log.Printf("error loading album: %s", err.Error())
+				return
+			}
+			m.DoAddTracksToPlaylistWorkflow(sharedutil.TracksToIDs(album.Tracks))
+		}()
 	}
 }
 
@@ -173,37 +171,41 @@ func (m *Controller) PromptForFirstServer() {
 // Depending on the results of that dialog, potentially create a new playlist
 // Add tracks to the user-specified playlist
 func (m *Controller) DoAddTracksToPlaylistWorkflow(trackIDs []string) {
-	pls, err := m.App.LibraryManager.GetUserOwnedPlaylists()
-	if err != nil {
-		// TODO: surface this error to user
-		log.Printf("error getting user-owned playlists: %s", err.Error())
-		return
-	}
-	plNames := make([]string, 0, len(pls))
-	for _, pl := range pls {
-		plNames = append(plNames, pl.Name)
-	}
-
-	dlg := dialogs.NewAddToPlaylistDialog("Add to Playlist", plNames)
-	pop := widget.NewModalPopUp(dlg, m.MainWindow.Canvas())
-	m.ClosePopUpOnEscape(pop)
-	dlg.OnCanceled = pop.Hide
-	dlg.OnSubmit = func(playlistChoice int, newPlaylistName string) {
-		pop.Hide()
-		m.doModalClosed()
-		if playlistChoice < 0 {
-			m.App.ServerManager.Server.CreatePlaylistWithTracks(
-				trackIDs, map[string]string{"name": newPlaylistName})
-		} else {
-			m.App.ServerManager.Server.UpdatePlaylistTracks(
-				pls[playlistChoice].ID, trackIDs, nil /*tracksToRemove*/)
+	go func() {
+		pls, err := m.App.ServerManager.Server.GetPlaylists()
+		pls = sharedutil.FilterSlice(pls, func(pl *mediaprovider.Playlist) bool {
+			return pl.Owner == m.App.ServerManager.LoggedInUser
+		})
+		if err != nil {
+			// TODO: surface this error to user
+			log.Printf("error getting user-owned playlists: %s", err.Error())
+			return
 		}
-	}
-	m.haveModal = true
-	pop.Show()
+		plNames := make([]string, 0, len(pls))
+		for _, pl := range pls {
+			plNames = append(plNames, pl.Name)
+		}
+
+		dlg := dialogs.NewAddToPlaylistDialog("Add to Playlist", plNames)
+		pop := widget.NewModalPopUp(dlg, m.MainWindow.Canvas())
+		m.ClosePopUpOnEscape(pop)
+		dlg.OnCanceled = pop.Hide
+		dlg.OnSubmit = func(playlistChoice int, newPlaylistName string) {
+			pop.Hide()
+			m.doModalClosed()
+			if playlistChoice < 0 {
+				go m.App.ServerManager.Server.CreatePlaylist(newPlaylistName, trackIDs)
+			} else {
+				go m.App.ServerManager.Server.EditPlaylistTracks(
+					pls[playlistChoice].ID, trackIDs, nil /*tracksToRemove*/)
+			}
+		}
+		m.haveModal = true
+		pop.Show()
+	}()
 }
 
-func (m *Controller) DoEditPlaylistWorkflow(playlist *subsonic.Playlist) {
+func (m *Controller) DoEditPlaylistWorkflow(playlist *mediaprovider.Playlist) {
 	dlg := dialogs.NewEditPlaylistDialog(playlist)
 	pop := widget.NewModalPopUp(dlg, m.MainWindow.Canvas())
 	m.ClosePopUpOnEscape(pop)
@@ -234,11 +236,7 @@ func (m *Controller) DoEditPlaylistWorkflow(playlist *subsonic.Playlist) {
 		pop.Hide()
 		m.doModalClosed()
 		go func() {
-			err := m.App.ServerManager.Server.UpdatePlaylist(playlist.ID, map[string]string{
-				"name":    dlg.Name,
-				"comment": dlg.Description,
-				"public":  strconv.FormatBool(dlg.IsPublic),
-			})
+			err := m.App.ServerManager.Server.EditPlaylist(playlist.ID, dlg.Name, dlg.Description, dlg.IsPublic)
 			if err != nil {
 				log.Printf("error updating playlist: %s", err.Error())
 			} else if rte := m.CurPageFunc(); rte.Page == Playlist && rte.Arg == playlist.ID {
@@ -405,49 +403,19 @@ func (c *Controller) doModalClosed() {
 }
 
 func (c *Controller) SetTrackFavorites(trackIDs []string, favorite bool) {
-	s := c.App.ServerManager.Server
-	if favorite {
-		go s.Star(subsonic.StarParameters{SongIDs: trackIDs})
-	} else {
-		go s.Unstar(subsonic.StarParameters{SongIDs: trackIDs})
-	}
+	go c.App.ServerManager.Server.SetFavorite(mediaprovider.RatingFavoriteParameters{
+		TrackIDs: trackIDs,
+	}, favorite)
+
 	for _, id := range trackIDs {
 		c.App.PlaybackManager.OnTrackFavoriteStatusChanged(id, favorite)
 	}
 }
 
 func (c *Controller) SetTrackRatings(trackIDs []string, rating int) {
-	// Subsonic doesn't allow bulk setting ratings.
-	// To not overwhelm the server with requests, set rating for
-	// only 5 tracks at a time concurrently
-	batchSize := 5
-	batchSetRating := func(offs int, wg *sync.WaitGroup) {
-		for i := 0; i < batchSize && offs+i < len(trackIDs); i++ {
-			if wg != nil {
-				wg.Add(1)
-			}
-			go func(idx int) {
-				c.App.ServerManager.Server.SetRating(trackIDs[idx], rating)
-				if wg != nil {
-					wg.Done()
-				}
-			}(offs + i)
-		}
-	}
-
-	if len(trackIDs) <= 5 {
-		// one batch only - no need to use wait group
-		batchSetRating(0, nil)
-	} else {
-		go func() {
-			numBatches := int(math.Ceil(float64(len(trackIDs)) / float64(batchSize)))
-			for i := 0; i < numBatches; i++ {
-				var wg sync.WaitGroup
-				batchSetRating(i*batchSize, &wg)
-				wg.Wait()
-			}
-		}()
-	}
+	go c.App.ServerManager.Server.SetRating(mediaprovider.RatingFavoriteParameters{
+		TrackIDs: trackIDs,
+	}, rating)
 
 	// Notify PlaybackManager of rating change to update
 	// the in-memory track models

ui/dialogs/editplaylistdialog.go

@@ -6,7 +6,7 @@ import (
 	"fyne.io/fyne/v2/data/binding"
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/widget"
-	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 )
 
 type EditPlaylistDialog struct {
@@ -23,11 +23,11 @@ type EditPlaylistDialog struct {
 	container *fyne.Container
 }
 
-func NewEditPlaylistDialog(playlist *subsonic.Playlist) *EditPlaylistDialog {
+func NewEditPlaylistDialog(playlist *mediaprovider.Playlist) *EditPlaylistDialog {
 	e := &EditPlaylistDialog{
 		IsPublic:    playlist.Public,
 		Name:        playlist.Name,
-		Description: playlist.Comment,
+		Description: playlist.Description,
 	}
 	e.ExtendBaseWidget(e)
 

ui/mainwindow.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/res"
 	"github.com/dweymouth/supersonic/ui/browsing"
 	"github.com/dweymouth/supersonic/ui/controller"
@@ -15,7 +16,6 @@ import (
 	"fyne.io/fyne/v2/dialog"
 	"fyne.io/fyne/v2/driver/desktop"
 	"fyne.io/fyne/v2/widget"
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 var (
@@ -81,12 +81,12 @@ func NewMainWindow(fyneApp fyne.App, appName, appVersion string, app *backend.Ap
 	m.container = container.NewBorder(nil, m.BottomPanel, nil, nil, m.BrowsingPane)
 	m.Window.SetContent(m.container)
 	m.Window.Resize(size)
-	app.PlaybackManager.OnSongChange(func(song *subsonic.Child, _ *subsonic.Child) {
+	app.PlaybackManager.OnSongChange(func(song, _ *mediaprovider.Track) {
 		if song == nil {
 			m.Window.SetTitle(appName)
 			return
 		}
-		m.Window.SetTitle(fmt.Sprintf("%s – %s · %s", song.Title, song.Artist, appName))
+		m.Window.SetTitle(fmt.Sprintf("%s – %s · %s", song.Name, song.ArtistNames[0], appName))
 	})
 	app.ServerManager.OnServerConnected(func() {
 		m.BrowsingPane.EnableNavigationButtons()

ui/widgets/albumfilterbutton.go

@@ -9,7 +9,7 @@ import (
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/widget"
-	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/ui/theme"
 	"github.com/dweymouth/supersonic/ui/util"
 )
@@ -21,11 +21,11 @@ type AlbumFilterButton struct {
 	GenreDisabled    bool
 	FavoriteDisabled bool
 
-	filter *backend.AlbumFilter
+	filter *mediaprovider.AlbumFilter
 	dialog *widget.PopUp
 }
 
-func NewAlbumFilterButton(filter *backend.AlbumFilter) *AlbumFilterButton {
+func NewAlbumFilterButton(filter *mediaprovider.AlbumFilter) *AlbumFilterButton {
 	a := &AlbumFilterButton{
 		filter: filter,
 		Button: widget.Button{

ui/widgets/gridview.go

@@ -6,17 +6,38 @@ import (
 	"log"
 	"sync"
 
-	"github.com/dweymouth/supersonic/backend"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/res"
 	"github.com/dweymouth/supersonic/sharedutil"
 
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/widget"
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 const batchFetchSize = 6
 
+type BatchingIterator struct {
+	iter mediaprovider.AlbumIterator
+}
+
+func NewBatchingIterator(iter mediaprovider.AlbumIterator) BatchingIterator {
+	return BatchingIterator{iter}
+}
+
+func (b *BatchingIterator) NextN(n int) []*mediaprovider.Album {
+	results := make([]*mediaprovider.Album, 0, n)
+	i := 0
+	for i < n {
+		album := b.iter.Next()
+		if album == nil {
+			break
+		}
+		results = append(results, album)
+		i++
+	}
+	return results
+}
+
 type ImageFetcher interface {
 	GetCoverThumbnailFromCache(string) (image.Image, bool)
 	GetCoverThumbnail(string) (image.Image, error)
@@ -27,24 +48,24 @@ type GridViewIterator interface {
 }
 
 type gridViewAlbumIterator struct {
-	iter *backend.BatchingIterator
+	iter BatchingIterator
 }
 
 func (g gridViewAlbumIterator) NextN(n int) []GridViewItemModel {
 	albums := g.iter.NextN(n)
-	return sharedutil.MapSlice(albums, func(al *subsonic.AlbumID3) GridViewItemModel {
+	return sharedutil.MapSlice(albums, func(al *mediaprovider.Album) GridViewItemModel {
 		return GridViewItemModel{
 			Name:        al.Name,
 			ID:          al.ID,
-			CoverArtID:  al.CoverArt,
-			Secondary:   al.Artist,
-			SecondaryID: al.ArtistID,
+			CoverArtID:  al.CoverArtID,
+			Secondary:   al.ArtistNames[0],
+			SecondaryID: al.ArtistIDs[0],
 		}
 	})
 }
 
-func NewGridViewAlbumIterator(iter backend.AlbumIterator) GridViewIterator {
-	return gridViewAlbumIterator{iter: backend.NewBatchingIterator(iter)}
+func NewGridViewAlbumIterator(iter mediaprovider.AlbumIterator) GridViewIterator {
+	return gridViewAlbumIterator{iter: NewBatchingIterator(iter)}
 }
 
 type GridView struct {

ui/widgets/tracklist.go

@@ -5,8 +5,8 @@ import (
 	"log"
 	"strconv"
 	"sync"
-	"time"
 
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/sharedutil"
 	"github.com/dweymouth/supersonic/ui/layouts"
 	"github.com/dweymouth/supersonic/ui/os"
@@ -18,7 +18,6 @@ import (
 	"fyne.io/fyne/v2/driver/desktop"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
 const (
@@ -40,7 +39,7 @@ type Tracklist struct {
 	// Tracks is the set of tracks displayed by the widget.
 	// Direct access to this is not thread-safe but OK for
 	// views that only load tracks into the widget once at page load.
-	Tracks []*subsonic.Child
+	Tracks []*mediaprovider.Track
 
 	// AutoNumber sets whether to auto-number the tracks 1..N in display order,
 	// or to use the number from the track's metadata
@@ -60,8 +59,8 @@ type Tracklist struct {
 
 	// user action callbacks
 	OnPlayTrackAt   func(int)
-	OnPlaySelection func(tracks []*subsonic.Child, shuffle bool)
-	OnAddToQueue    func(trackIDs []*subsonic.Child)
+	OnPlaySelection func(tracks []*mediaprovider.Track, shuffle bool)
+	OnAddToQueue    func(trackIDs []*mediaprovider.Track)
 	OnAddToPlaylist func(trackIDs []string)
 	OnSetFavorite   func(trackIDs []string, fav bool)
 	OnSetRating     func(trackIDs []string, rating int)
@@ -85,7 +84,7 @@ type Tracklist struct {
 	container    *fyne.Container
 }
 
-func NewTracklist(tracks []*subsonic.Child) *Tracklist {
+func NewTracklist(tracks []*mediaprovider.Track) *Tracklist {
 	t := &Tracklist{Tracks: tracks, visibleColumns: make([]bool, 12)}
 
 	t.ExtendBaseWidget(t)
@@ -144,7 +143,7 @@ func (t *Tracklist) buildHeader() {
 }
 
 // Gets the track at the given index. Thread-safe.
-func (t *Tracklist) TrackAt(idx int) *subsonic.Child {
+func (t *Tracklist) TrackAt(idx int) *mediaprovider.Track {
 	t.tracksMutex.RLock()
 	defer t.tracksMutex.RUnlock()
 	if idx >= len(t.Tracks) {
@@ -216,7 +215,7 @@ func (t *Tracklist) Clear() {
 }
 
 // Append more tracks to the tracklist. Thread-safe.
-func (t *Tracklist) AppendTracks(trs []*subsonic.Child) {
+func (t *Tracklist) AppendTracks(trs []*mediaprovider.Track) {
 	t.tracksMutex.Lock()
 	defer t.tracksMutex.Unlock()
 	t.Tracks = append(t.Tracks, trs...)
@@ -330,16 +329,12 @@ func (t *Tracklist) onSetFavorite(trackID string, fav bool) {
 	t.tracksMutex.RLock()
 	tr := sharedutil.FindTrackByID(trackID, t.Tracks)
 	t.tracksMutex.RUnlock()
-	t.onSetFavorites([]*subsonic.Child{tr}, fav, false)
+	t.onSetFavorites([]*mediaprovider.Track{tr}, fav, false)
 }
 
-func (t *Tracklist) onSetFavorites(tracks []*subsonic.Child, fav bool, needRefresh bool) {
+func (t *Tracklist) onSetFavorites(tracks []*mediaprovider.Track, fav bool, needRefresh bool) {
 	for _, tr := range tracks {
-		if fav {
-			tr.Starred = time.Now()
-		} else {
-			tr.Starred = time.Time{}
-		}
+		tr.Favorite = fav
 	}
 	if needRefresh {
 		t.Refresh()
@@ -355,12 +350,12 @@ func (t *Tracklist) onSetRating(trackID string, rating int) {
 	t.tracksMutex.RLock()
 	tr := sharedutil.FindTrackByID(trackID, t.Tracks)
 	t.tracksMutex.RUnlock()
-	t.onSetRatings([]*subsonic.Child{tr}, rating, false)
+	t.onSetRatings([]*mediaprovider.Track{tr}, rating, false)
 }
 
-func (t *Tracklist) onSetRatings(tracks []*subsonic.Child, rating int, needRefresh bool) {
+func (t *Tracklist) onSetRatings(tracks []*mediaprovider.Track, rating int, needRefresh bool) {
 	for _, tr := range tracks {
-		tr.UserRating = rating
+		tr.Rating = rating
 	}
 	if needRefresh {
 		t.Refresh()
@@ -383,9 +378,9 @@ func (t *Tracklist) onAlbumTapped(albumID string) {
 	}
 }
 
-func (t *Tracklist) selectedTracks() []*subsonic.Child {
+func (t *Tracklist) selectedTracks() []*mediaprovider.Track {
 	sel := t.selectionMgr.GetSelection()
-	tracks := make([]*subsonic.Child, 0, len(sel))
+	tracks := make([]*mediaprovider.Track, 0, len(sel))
 	t.tracksMutex.RLock()
 	defer t.tracksMutex.RUnlock()
 	for _, idx := range sel {
@@ -484,7 +479,7 @@ type TrackRow struct {
 	albumID    string
 	isPlaying  bool
 	isFavorite bool
-	playCount  int64
+	playCount  int
 
 	num      *widget.RichText
 	name     *widget.RichText
@@ -543,37 +538,37 @@ func newTrailingAlignRichText() *widget.RichText {
 	return rt
 }
 
-func (t *TrackRow) Update(tr *subsonic.Child, rowNum int) {
+func (t *TrackRow) Update(tr *mediaprovider.Track, rowNum int) {
 	// Update info that can change if this row is bound to
-	// a new track (*subsonic.Child)
+	// a new track (*mediaprovider.Track)
 	if tr.ID != t.trackID {
 		if t.Focused {
 			fyne.CurrentApp().Driver().CanvasForObject(t).Focus(nil)
 			t.Focused = false
 		}
 		t.trackID = tr.ID
-		t.artistID = tr.ArtistID
+		t.artistID = tr.ArtistIDs[0]
 		t.albumID = tr.AlbumID
 
-		t.name.Segments[0].(*widget.TextSegment).Text = tr.Title
-		t.artist.SetText(tr.Artist)
-		t.artist.Disabled = tr.ArtistID == ""
+		t.name.Segments[0].(*widget.TextSegment).Text = tr.Name
+		t.artist.SetText(tr.ArtistNames[0])
+		t.artist.Disabled = tr.ArtistIDs[0] == ""
 		t.album.SetText(tr.Album)
 		t.dur.Segments[0].(*widget.TextSegment).Text = util.SecondsToTimeString(float64(tr.Duration))
 		t.year.Segments[0].(*widget.TextSegment).Text = strconv.Itoa(tr.Year)
 		t.plays.Segments[0].(*widget.TextSegment).Text = strconv.Itoa(int(tr.PlayCount))
 		t.bitrate.Segments[0].(*widget.TextSegment).Text = strconv.Itoa(tr.BitRate)
 		t.size.Segments[0].(*widget.TextSegment).Text = util.BytesToSizeString(tr.Size)
-		t.path.Segments[0].(*widget.TextSegment).Text = tr.Path
+		t.path.Segments[0].(*widget.TextSegment).Text = tr.FilePath
 	}
 
 	// Update track num if needed
-	// (which can change based on bound *subsonic.Child or tracklist.AutoNumber)
+	// (which can change based on bound *mediaprovider.Track or tracklist.AutoNumber)
 	if t.trackNum != rowNum {
 		discNum := -1
 		var str string
 		if rowNum < 0 {
-			rowNum = tr.Track
+			rowNum = tr.TrackNumber
 			if t.tracklist.ShowDiscNumber {
 				discNum = tr.DiscNumber
 			}
@@ -612,15 +607,15 @@ func (t *TrackRow) Update(tr *subsonic.Child, rowNum int) {
 	}
 
 	// Render favorite column
-	if tr.Starred.IsZero() {
-		t.isFavorite = false
-		t.favorite.Objects[0].(*TappableIcon).Resource = myTheme.NotFavoriteIcon
-	} else {
+	if tr.Favorite {
 		t.isFavorite = true
 		t.favorite.Objects[0].(*TappableIcon).Resource = myTheme.FavoriteIcon
+	} else {
+		t.isFavorite = false
+		t.favorite.Objects[0].(*TappableIcon).Resource = myTheme.NotFavoriteIcon
 	}
 
-	t.rating.Rating = tr.UserRating
+	t.rating.Rating = tr.Rating
 
 	// Show only columns configured to be visible
 	t.artist.Hidden = !t.tracklist.visibleColumns[ColNumber(ColumnArtist)]

ui/widgets/tracklistloader.go

@@ -1,25 +1,23 @@
 package widgets
 
 import (
-	"github.com/dweymouth/supersonic/backend"
-
-	"github.com/dweymouth/go-subsonic/subsonic"
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 )
 
 // Component that manages lazily loading more tracks into a Tracklist
 // as the user scrolls near the bottom.
 type TracklistLoader struct {
 	tracklist *Tracklist
-	iter      backend.TrackIterator
+	iter      mediaprovider.TrackIterator
 
-	trackBuffer  []*subsonic.Child
+	trackBuffer  []*mediaprovider.Track
 	fetching     bool
 	done         bool
 	len          int
 	highestShown int
 }
 
-func NewTracklistLoader(tracklist *Tracklist, iter backend.TrackIterator) TracklistLoader {
+func NewTracklistLoader(tracklist *Tracklist, iter mediaprovider.TrackIterator) TracklistLoader {
 	t := TracklistLoader{
 		tracklist: tracklist,
 		iter:      iter,
@@ -44,7 +42,7 @@ func (t *TracklistLoader) loadMoreTracks(num int) {
 	// repeat fetch task as long as user has scrolled near bottom
 	for !t.done && t.highestShown >= t.len-25 {
 		if t.trackBuffer == nil {
-			t.trackBuffer = make([]*subsonic.Child, 0, num)
+			t.trackBuffer = make([]*mediaprovider.Track, 0, num)
 		}
 		t.trackBuffer = t.trackBuffer[:0]
 		for i := 0; i < num; i++ {