pass MIME type and seekable flag to DLNA players

backend/mediaprovider/model.go

@@ -183,6 +183,7 @@ const (
 
 type MediaItemMetadata struct {
 	Type       MediaItemType
+	MIMEType   string
 	ID         string
 	Name       string
 	Artists    []string
@@ -204,6 +205,7 @@ func (t *Track) Metadata() MediaItemMetadata {
 	}
 	return MediaItemMetadata{
 		Type:       MediaItemTypeTrack,
+		MIMEType:   t.ContentType,
 		ID:         t.ID,
 		Name:       t.Title,
 		Artists:    t.ArtistNames,

backend/playbackengine.go

@@ -140,6 +140,14 @@ func (p *playbackEngine) registerPlayerCallbacks(pl player.BasePlayer) {
 	})
 }
 
+func (p *playbackEngine) unregisterPlayerCallbacks(pl player.BasePlayer) {
+	pl.OnPaused(nil)
+	pl.OnPlaying(nil)
+	pl.OnStopped(nil)
+	pl.OnSeek(nil)
+	pl.OnTrackChange(nil)
+}
+
 func (p *playbackEngine) SetPlayer(pl player.BasePlayer) error {
 	// even if we don't successfully change players,
 	// make sure UI updates if needed (eg enabling cast button)
@@ -162,6 +170,7 @@ func (p *playbackEngine) SetPlayer(pl player.BasePlayer) error {
 		p.pendingPlayerChangeTimePos = stat.TimePos
 		p.pendingPlayerChange = true
 	}
+	p.unregisterPlayerCallbacks(p.player)
 	if err := p.player.Stop(true); err != nil {
 		log.Printf("failed to stop player: %v", err)
 	}

backend/player/dlna/dlnaplayer.go

@@ -158,6 +158,8 @@ func (d *DLNAPlayer) PlayFile(urlstr string, meta mediaprovider.MediaItemMetadat
 	media := avtransport.MediaItem{
 		URL:         d.urlForItem(key),
 		Title:       meta.Name,
+		ContentType: meta.MIMEType,
+		Seekable:    true,
 	}
 
 	if err := d.playAVTransportMedia(&media); err != nil {
@@ -225,7 +227,9 @@ func (d *DLNAPlayer) SetNextFile(url string, meta mediaprovider.MediaItemMetadat
 		key := d.addURLToProxy(url)
 		media = &avtransport.MediaItem{
 			URL:         d.urlForItem(key),
+			ContentType: meta.MIMEType,
 			Title:       meta.Name,
+			Seekable:    true,
 		}
 	}