don't assume MPV player in now playing page

backend/playbackmanager.go

@@ -51,6 +51,7 @@ type PlaybackManager struct {
 	onPaused         []func()
 	onStopped        []func()
 	onPlaying        []func()
+	onPlayerChange   []func()
 }
 
 func NewPlaybackManager(
@@ -122,6 +123,14 @@ func (pm *PlaybackManager) invokeNoArgCallbacks(cbs []func()) {
 	}
 }
 
+func (p *PlaybackManager) CurrentPlayer() player.BasePlayer {
+	return p.player
+}
+
+func (p *PlaybackManager) OnPlayerChange(cb func()) {
+	p.onPlayerChange = append(p.onPlayerChange, cb)
+}
+
 func (p *PlaybackManager) IsSeeking() bool {
 	return p.player.IsSeeking()
 }

ui/browsing/nowplayingpage.go

@@ -42,7 +42,6 @@ type nowPlayingPageState struct {
 	pool    *util.WidgetPool
 	conf    *backend.NowPlayingPageConfig
 	pm      *backend.PlaybackManager
-	p       *mpv.Player
 	canRate bool
 }
 
@@ -52,17 +51,16 @@ func NewNowPlayingPage(
 	pool *util.WidgetPool,
 	conf *backend.NowPlayingPageConfig,
 	pm *backend.PlaybackManager,
-	p *mpv.Player, // TODO: once other player backends are supported (eg uPnP), refactor
 	canRate bool,
 ) *NowPlayingPage {
 	a := &NowPlayingPage{nowPlayingPageState: nowPlayingPageState{
-		contr: contr, pool: pool, conf: conf, pm: pm, p: p, canRate: canRate,
+		contr: contr, pool: pool, conf: conf, pm: pm, canRate: canRate,
 	}}
 	a.ExtendBaseWidget(a)
 
-	p.OnPaused(a.formatStatusLine)
-	p.OnPlaying(a.formatStatusLine)
-	p.OnStopped(a.formatStatusLine)
+	pm.OnPaused(a.formatStatusLine)
+	pm.OnPlaying(a.formatStatusLine)
+	pm.OnStopped(a.formatStatusLine)
 
 	if t := a.pool.Obtain(util.WidgetTypeTracklist); t != nil {
 		a.tracklist = t.(*widgets.Tracklist)
@@ -136,7 +134,8 @@ func (a *NowPlayingPage) OnPlayTimeUpdate(_, _ float64) {
 }
 
 func (a *NowPlayingPage) formatStatusLine() {
-	playerStats := a.p.GetStatus()
+	curPlayer := a.pm.CurrentPlayer()
+	playerStats := curPlayer.GetStatus()
 	lastStatus := a.statusLabel.Text
 	state := "Stopped"
 	switch playerStats.State {
@@ -161,32 +160,40 @@ func (a *NowPlayingPage) formatStatusLine() {
 	status := fmt.Sprintf("%s (%d/%d)%s", state, trackNum,
 		len(a.queue), statusSuffix)
 
-	if state == "Stopped" {
-		a.statusLabel.Text = fmt.Sprintf("%s | Total time: %s", status, util.SecondsToTimeString(a.totalTime))
-	} else {
-		audioInfo, err := a.p.GetMediaInfo()
-		if err != nil {
-			log.Printf("error getting playback status: %s", err.Error())
-		}
-		codec := audioInfo.Codec
-		if len(codec) <= 4 && !strings.EqualFold(codec, "opus") {
-			codec = strings.ToUpper(codec) // FLAC, MP3, AAC, etc
-		}
-
-		// Note: bit depth intentionally omitted since MPV reports the decoded bit depth
-		// i.e. 24 bit files get reported as 32 bit. Also b/c bit depth isn't meaningful for lossy.
-		a.statusLabel.Text = fmt.Sprintf("%s · %s %g kHz, %d kbps | Total time: %s",
-			status,
-			codec,
-			float64(audioInfo.Samplerate)/1000,
-			audioInfo.Bitrate/1000,
-			util.SecondsToTimeString(a.totalTime))
+	mediaInfo := ""
+	if state != "Stopped" {
+		mediaInfo = a.formatMediaInfoStr(curPlayer)
 	}
+	if mediaInfo != "" {
+		mediaInfo = " · " + mediaInfo
+	}
+
+	a.statusLabel.Text = fmt.Sprintf("%s%s | Total time: %s", status, mediaInfo, util.SecondsToTimeString(a.totalTime))
 	if lastStatus != a.statusLabel.Text {
 		a.statusLabel.Refresh()
 	}
 }
 
+func (a *NowPlayingPage) formatMediaInfoStr(player player.BasePlayer) string {
+	mpv, ok := player.(*mpv.Player)
+	if !ok {
+		return ""
+	}
+	audioInfo, err := mpv.GetMediaInfo()
+	if err != nil {
+		log.Printf("error getting playback status: %s", err.Error())
+		return ""
+	}
+	codec := audioInfo.Codec
+	if len(codec) <= 4 && !strings.EqualFold(codec, "opus") {
+		codec = strings.ToUpper(codec) // FLAC, MP3, AAC, etc
+	}
+
+	// Note: bit depth intentionally omitted since MPV reports the decoded bit depth
+	// i.e. 24 bit files get reported as 32 bit. Also b/c bit depth isn't meaningful for lossy.
+	return fmt.Sprintf("%s %g kHz, %d kbps", codec, float64(audioInfo.Samplerate)/1000, audioInfo.Bitrate/1000)
+}
+
 func (a *NowPlayingPage) Reload() {
 	a.load("")
 }
@@ -217,5 +224,5 @@ func (a *NowPlayingPage) load(highlightedTrackID string) {
 }
 
 func (s *nowPlayingPageState) Restore() Page {
-	return NewNowPlayingPage("", s.contr, s.pool, s.conf, s.pm, s.p, s.canRate)
+	return NewNowPlayingPage("", s.contr, s.pool, s.conf, s.pm, s.canRate)
 }

ui/browsing/router.go

@@ -47,7 +47,7 @@ func (r Router) CreatePage(rte controller.Route) Page {
 		return NewGenresPage(r.Controller, r.App.ServerManager.Server)
 	case controller.NowPlaying:
 		_, canRate := r.App.ServerManager.Server.(mediaprovider.SupportsRating)
-		return NewNowPlayingPage(rte.Arg, r.Controller, r.widgetPool, &r.App.Config.NowPlayingPage, r.App.PlaybackManager, r.App.Player, canRate)
+		return NewNowPlayingPage(rte.Arg, r.Controller, r.widgetPool, &r.App.Config.NowPlayingPage, r.App.PlaybackManager, canRate)
 	case controller.Playlist:
 		return NewPlaylistPage(rte.Arg, &r.App.Config.PlaylistPage, r.widgetPool, r.Controller, r.App.ServerManager, r.App.PlaybackManager, r.App.ImageManager)
 	case controller.Playlists: