Merge pull request #582 from dweymouth/feat/dlnacast

Add ability to cast playback to DLNA devices

backend/app.go

@@ -152,6 +152,21 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 		a.LrcLibFetcher = NewLrcLibFetcher(a.cacheDir, a.Config.Application.CustomLrcLibUrl, timeout)
 	}
 
+	// Periodically scan for remote players
+	go a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, true /*fastScan*/)
+	go func() {
+		t := time.NewTicker(5 * time.Minute)
+		for {
+			select {
+			case <-a.bgrndCtx.Done():
+				t.Stop()
+				return
+			case <-t.C:
+				a.PlaybackManager.ScanRemotePlayers(a.bgrndCtx, false)
+			}
+		}
+	}()
+
 	a.PlaybackManager.OnPlaying(func() {
 		SetSystemSleepDisabled(true)
 	})
@@ -389,7 +404,7 @@ func (a *App) SetupWindowsSMTC(hwnd uintptr) {
 	})
 	a.PlaybackManager.OnSeek(func() {
 		dur := a.PlaybackManager.NowPlaying().Metadata().Duration
-		smtc.UpdatePosition(int(a.PlaybackManager.CurrentPlayer().GetStatus().TimePos*1000), dur*1000)
+		smtc.UpdatePosition(int(a.PlaybackManager.PlaybackStatus().TimePos*1000), dur*1000)
 	})
 	a.PlaybackManager.OnPlaying(func() {
 		smtc.SetEnabled(true)
@@ -448,7 +463,7 @@ func (a *App) Shutdown() {
 		a.WinSMTC.Shutdown()
 	}
 	a.PlaybackManager.DisableCallbacks()
-	a.PlaybackManager.Stop() // will trigger scrobble check
+	a.PlaybackManager.Shutdown() // will trigger scrobble check
 	a.cancel()
 	a.LocalPlayer.Destroy()
 }

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/mpmedia_mac.go

@@ -84,17 +84,17 @@ func InitMPMediaHandler(playbackManager *PlaybackManager, artURLLookup func(trac
 	})
 
 	mp.playbackManager.OnSeek(func() {
-		C.update_os_now_playing_info_position(C.double(mp.playbackManager.PlayerStatus().TimePos))
+		C.update_os_now_playing_info_position(C.double(mp.playbackManager.PlaybackStatus().TimePos))
 	})
 
 	mp.playbackManager.OnPlaying(func() {
 		C.set_os_playback_state_playing()
-		C.update_os_now_playing_info_position(C.double(mp.playbackManager.PlayerStatus().TimePos))
+		C.update_os_now_playing_info_position(C.double(mp.playbackManager.PlaybackStatus().TimePos))
 	})
 
 	mp.playbackManager.OnPaused(func() {
 		C.set_os_playback_state_paused()
-		C.update_os_now_playing_info_position(C.double(mp.playbackManager.PlayerStatus().TimePos))
+		C.update_os_now_playing_info_position(C.double(mp.playbackManager.PlaybackStatus().TimePos))
 	})
 
 	return nil

backend/mpris.go

@@ -54,7 +54,7 @@ func NewMPRISHandler(playerName string, pm *PlaybackManager) *MPRISHandler {
 
 	pm.OnSeek(func() {
 		if m.connErr == nil {
-			pos := secondsToMicroseconds(pm.PlayerStatus().TimePos)
+			pos := secondsToMicroseconds(pm.PlaybackStatus().TimePos)
 			m.evt.Player.OnSeek(pos)
 		}
 	})
@@ -160,7 +160,7 @@ func (m *MPRISHandler) Previous() error {
 }
 
 func (m *MPRISHandler) Pause() error {
-	if m.pm.PlayerStatus().State == player.Playing {
+	if m.pm.PlaybackStatus().State == player.Playing {
 		m.pm.PlayPause()
 	}
 	return nil
@@ -177,7 +177,7 @@ func (m *MPRISHandler) Stop() error {
 }
 
 func (m *MPRISHandler) Play() error {
-	switch m.pm.PlayerStatus().State {
+	switch m.pm.PlaybackStatus().State {
 	case player.Paused:
 		m.pm.PlayPause()
 	case player.Stopped:
@@ -204,7 +204,7 @@ func (m *MPRISHandler) OpenUri(uri string) error {
 }
 
 func (m *MPRISHandler) PlaybackStatus() (types.PlaybackStatus, error) {
-	switch m.pm.PlayerStatus().State {
+	switch m.pm.PlaybackStatus().State {
 	case player.Playing:
 		return types.PlaybackStatusPlaying, nil
 	case player.Paused:
@@ -254,7 +254,7 @@ func (m *MPRISHandler) Metadata() (types.Metadata, error) {
 	if m.curTrackPath != "" {
 		trackObjPath = m.curTrackPath
 	}
-	status := m.pm.PlayerStatus()
+	status := m.pm.PlaybackStatus()
 
 	var meta mediaprovider.MediaItemMetadata
 	// metadata that can come only from tracks
@@ -307,7 +307,7 @@ func (m *MPRISHandler) SetVolume(v float64) error {
 }
 
 func (m *MPRISHandler) Position() (int64, error) {
-	return int64(secondsToMicroseconds(m.pm.PlayerStatus().TimePos)), nil
+	return int64(secondsToMicroseconds(m.pm.PlaybackStatus().TimePos)), nil
 }
 
 func (m *MPRISHandler) MinimumRate() (float64, error) {

backend/playbackcommands.go

@@ -35,6 +35,7 @@ type playbackCommand struct {
 	Arg    any
 	Arg2   any
 	Arg3   any
+	OnDone func()
 }
 
 // playbackCommandQueue is a queue to accumulate player commands from the UI
@@ -60,11 +61,24 @@ func (c *playbackCommandQueue) C() <-chan playbackCommand {
 	return c.nextChan
 }
 
+func (c *playbackCommandQueue) Clear() {
+	c.mutex.Lock()
+	c.queue = nil
+	c.mutex.Unlock()
+}
+
 func (c *playbackCommandQueue) Stop() {
 	c.filterCommandsAndAdd([]playbackCommandType{cmdContinue, cmdPause, cmdStop},
 		playbackCommand{Type: cmdStop})
 }
 
+func (c *playbackCommandQueue) StopAndWait() {
+	done := make(chan struct{})
+	c.filterCommandsAndAdd([]playbackCommandType{cmdContinue, cmdPause, cmdStop},
+		playbackCommand{Type: cmdStop, OnDone: func() { close(done) }})
+	<-done
+}
+
 func (c *playbackCommandQueue) Continue() {
 	c.filterCommandsAndAdd([]playbackCommandType{cmdContinue, cmdPause, cmdStop},
 		playbackCommand{Type: cmdContinue})

backend/playbackengine.go

@@ -9,10 +9,13 @@ import (
 
 	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/backend/player"
+	"github.com/dweymouth/supersonic/backend/player/mpv"
 	"github.com/dweymouth/supersonic/backend/util"
 	"github.com/dweymouth/supersonic/sharedutil"
 )
 
+// TODO: make thread-safe
+
 var (
 	ReplayGainNone  = player.ReplayGainNone.String()
 	ReplayGainAlbum = player.ReplayGainAlbum.String()
@@ -37,6 +40,14 @@ const (
 	LoopOne
 )
 
+type PlaybackState = player.State
+
+type PlaybackStatus struct {
+	State    PlaybackState
+	TimePos  float64
+	Duration float64
+}
+
 type playbackEngine struct {
 	ctx           context.Context
 	cancelPollPos context.CancelFunc
@@ -55,9 +66,16 @@ type playbackEngine struct {
 
 	// flags for handleOnTrackChange / handleOnStopped callbacks - reset to false in the callbacks
 	wasStopped       bool // true iff player was stopped before handleOnTrackChange invocation
-	noIncrementNextTrackChange bool // true iff the nowPlayingIndex should not be incremented on the next onTrackChange
 	alreadyScrobbled bool // true iff the previously-playing track was already scrobbled
 
+	// if >= 0, track number that was requested by PlayTrackAt
+	// onTrackChange callback should set nowPlayingIdx to this,
+	// and reset this to -1
+	pendingTrackChangeNum int
+
+	pendingPlayerChange       bool
+	pendingPlayerChangeStatus player.Status
+
 	// to pass to onSongChange listeners; clear once listeners have been called
 	lastScrobbled *mediaprovider.Track
 	scrobbleCfg   *ScrobbleConfig
@@ -102,23 +120,8 @@ func NewPlaybackEngine(
 	case "One":
 		pm.loopMode = LoopOne
 	}
-	p.OnTrackChange(pm.handleOnTrackChange)
-	p.OnSeek(func() {
-		pm.doUpdateTimePos(true)
-		pm.invokeNoArgCallbacks(pm.onSeek)
-	})
-	p.OnStopped(pm.handleOnStopped)
-	p.OnPaused(func() {
-		pm.playTimeStopwatch.Stop()
-		pm.stopPollTimePos()
-		pm.invokeNoArgCallbacks(pm.onPaused)
-	})
-	p.OnPlaying(func() {
-		pm.playTimeStopwatch.Start()
-		pm.startPollTimePos()
-		pm.invokeNoArgCallbacks(pm.onPlaying)
-	})
 
+	pm.registerPlayerCallbacks(p)
 	s.OnLogout(func() {
 		pm.StopAndClearPlayQueue()
 	})
@@ -126,18 +129,95 @@ func NewPlaybackEngine(
 	return pm
 }
 
+func (p *playbackEngine) registerPlayerCallbacks(pl player.BasePlayer) {
+	pl.OnTrackChange(p.handleOnTrackChange)
+	pl.OnSeek(func() {
+		p.doUpdateTimePos(true)
+		p.invokeNoArgCallbacks(p.onSeek)
+	})
+	pl.OnStopped(p.handleOnStopped)
+	pl.OnPaused(func() {
+		p.playTimeStopwatch.Stop()
+		p.stopPollTimePos()
+		p.invokeNoArgCallbacks(p.onPaused)
+	})
+	pl.OnPlaying(func() {
+		p.playTimeStopwatch.Start()
+		p.startPollTimePos()
+		p.invokeNoArgCallbacks(p.onPlaying)
+	})
+}
+
+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)
+	defer p.invokeNoArgCallbacks(p.onPlayerChange)
+
+	needToUnpause := false
+
+	stat := p.CurrentPlayer().GetStatus()
+	if p.pendingPlayerChange {
+		stat.State = player.Paused
+	}
+
+	switch stat.State {
+	case player.Stopped:
+		// nothing
+	case player.Playing:
+		needToUnpause = true
+		p.stopPollTimePos()
+		fallthrough
+	case player.Paused:
+		p.pendingPlayerChangeStatus = stat
+		p.pendingPlayerChange = true
+	}
+	p.unregisterPlayerCallbacks(p.player)
+	if err := p.player.Stop(true); err != nil {
+		log.Printf("failed to stop player: %v", err)
+	}
+
+	oldVol := p.player.GetVolume()
+	if _, isMPV := p.player.(*mpv.Player); !isMPV {
+		p.player.Destroy()
+	}
+	p.player = pl
+	p.registerPlayerCallbacks(pl)
+
+	if needToUnpause {
+		p.playTrackAt(p.nowPlayingIdx, p.pendingPlayerChangeStatus.TimePos)
+		p.pendingPlayerChange = false
+	}
+	p.invokeNoArgCallbacks(p.onPlayerChange)
+	vol := pl.GetVolume()
+	if oldVol != vol {
+		for _, cb := range p.onVolumeChange {
+			cb(vol)
+		}
+	}
+	return nil
+}
+
 func (p *playbackEngine) PlayTrackAt(idx int) error {
+	return p.playTrackAt(idx, 0)
+}
+
+func (p *playbackEngine) playTrackAt(idx int, startTime float64) error {
 	if idx < 0 || idx >= len(p.playQueue) {
 		return errors.New("track index out of range")
 	}
 	// scrobble current track if needed
 	p.checkScrobble()
 	p.alreadyScrobbled = true
-	p.noIncrementNextTrackChange = true
-	err := p.setTrack(idx, false)
-	if err == nil {
-		p.nowPlayingIdx = idx
-	}
+	p.pendingTrackChangeNum = idx
+	err := p.setTrack(idx, false, startTime)
 	return err
 }
 
@@ -168,8 +248,16 @@ func (p *playbackEngine) GetLoopMode() LoopMode {
 	return p.loopMode
 }
 
-func (p *playbackEngine) PlayerStatus() player.Status {
-	return p.player.GetStatus()
+func (p *playbackEngine) PlaybackStatus() PlaybackStatus {
+	stat := p.pendingPlayerChangeStatus
+	if !p.pendingPlayerChange {
+		stat = p.CurrentPlayer().GetStatus()
+	}
+	return PlaybackStatus{
+		State:    stat.State,
+		TimePos:  stat.TimePos,
+		Duration: stat.Duration,
+	}
 }
 
 func (p *playbackEngine) SetVolume(vol int) error {
@@ -188,14 +276,14 @@ func (p *playbackEngine) CurrentPlayer() player.BasePlayer {
 }
 
 func (p *playbackEngine) SeekNext() error {
-	if p.CurrentPlayer().GetStatus().State == player.Stopped {
+	if p.PlaybackStatus().State == player.Stopped {
 		return nil
 	}
 	return p.PlayTrackAt(p.nowPlayingIdx + 1)
 }
 
 func (p *playbackEngine) SeekBackOrPrevious() error {
-	if p.nowPlayingIdx == 0 || p.player.GetStatus().TimePos > 3 {
+	if p.nowPlayingIdx == 0 || p.PlaybackStatus().TimePos > 3 {
 		return p.player.SeekSeconds(0)
 	}
 	return p.PlayTrackAt(p.nowPlayingIdx - 1)
@@ -203,7 +291,7 @@ func (p *playbackEngine) SeekBackOrPrevious() error {
 
 func (p *playbackEngine) SeekFwdBackN(n int) error {
 	idx := p.nowPlayingIdx
-	if n < 0 && p.player.GetStatus().TimePos > 3 {
+	if n < 0 && p.PlaybackStatus().TimePos > 3 {
 		n += 1 // first seek back is just seek to beginning of current
 	}
 	if n == 0 || (idx == 0 && n < 0) {
@@ -230,7 +318,7 @@ func (p *playbackEngine) IsSeeking() bool {
 }
 
 func (p *playbackEngine) Stop() error {
-	return p.player.Stop()
+	return p.player.Stop(false)
 }
 
 func (p *playbackEngine) Pause() error {
@@ -238,7 +326,12 @@ func (p *playbackEngine) Pause() error {
 }
 
 func (p *playbackEngine) Continue() error {
-	if p.PlayerStatus().State == player.Stopped {
+	if p.pendingPlayerChange {
+		p.pendingPlayerChange = false
+		return p.playTrackAt(p.nowPlayingIdx, p.pendingPlayerChangeStatus.TimePos)
+	}
+
+	if p.PlaybackStatus().State == player.Stopped {
 		return p.PlayTrackAt(0)
 	}
 	return p.player.Continue()
@@ -260,7 +353,7 @@ func (p *playbackEngine) LoadTracks(tracks []*mediaprovider.Track, insertQueueMo
 
 func (p *playbackEngine) doLoaditems(items []mediaprovider.MediaItem, insertQueueMode InsertQueueMode, shuffle bool) error {
 	if insertQueueMode == Replace {
-		p.player.Stop()
+		p.player.Stop(false)
 		p.nowPlayingIdx = -1
 		p.playQueue = nil
 	}
@@ -286,7 +379,7 @@ func (p *playbackEngine) doLoaditems(items []mediaprovider.MediaItem, insertQueu
 
 func (p *playbackEngine) LoadRadioStation(radio *mediaprovider.RadioStation, insertMode InsertQueueMode) {
 	if insertMode == Replace {
-		p.player.Stop()
+		p.player.Stop(false)
 		p.nowPlayingIdx = -1
 		p.playQueue = nil
 	}
@@ -312,7 +405,7 @@ func (p *playbackEngine) LoadRadioStation(radio *mediaprovider.RadioStation, ins
 // Stop playback and clear the play queue.
 func (p *playbackEngine) StopAndClearPlayQueue() {
 	changed := len(p.playQueue) > 0
-	p.player.Stop()
+	p.player.Stop(false)
 	p.playQueue = nil
 	p.nowPlayingIdx = -1
 	if changed {
@@ -408,7 +501,7 @@ func (p *playbackEngine) RemoveTracksFromQueue(idxs []int) {
 			p.Stop()
 		} else {
 			p.nowPlayingIdx -= 1 // will be incremented in newtrack callback from player
-			p.setTrack(newNowPlaying, false)
+			p.setTrack(newNowPlaying, false, 0)
 		}
 		// setNextTrack and onSongChange callbacks will be handled
 		// when we receive new track event from player
@@ -468,21 +561,23 @@ func (p *playbackEngine) handleOnTrackChange() {
 		p.checkScrobble()
 	}
 
-	if p.player.GetStatus().State == player.Playing {
+	if p.PlaybackStatus().State == player.Playing {
 		p.playTimeStopwatch.Start()
 	}
-	if !p.noIncrementNextTrackChange && (p.wasStopped || p.loopMode != LoopOne) {
+	if p.pendingTrackChangeNum < 0 && (p.wasStopped || p.loopMode != LoopOne) {
 		p.nowPlayingIdx++
 		if p.loopMode == LoopAll && p.nowPlayingIdx == len(p.playQueue) {
 			p.nowPlayingIdx = 0 // wrapped around
 		}
+	} else if p.pendingTrackChangeNum >= 0 {
+		p.nowPlayingIdx = p.pendingTrackChangeNum
+		p.pendingTrackChangeNum = -1
 	}
 	nowPlaying := p.playQueue[p.nowPlayingIdx]
 	_, isRadio := nowPlaying.(*mediaprovider.RadioStation)
 	p.isRadio = isRadio
 
 	// reset flags
-	p.noIncrementNextTrackChange = false
 	p.wasStopped = false
 	p.alreadyScrobbled = false
 
@@ -548,12 +643,14 @@ func (p *playbackEngine) setNextTrackAfterQueueUpdate() {
 	}
 }
 
-func (p *playbackEngine) setTrack(idx int, next bool) error {
+func (p *playbackEngine) setTrack(idx int, next bool, startTime float64) error {
 	if urlP, ok := p.player.(player.URLPlayer); ok {
 		url := ""
+		var meta mediaprovider.MediaItemMetadata
 		if idx >= 0 {
 			var err error
 			item := p.playQueue[idx]
+			meta = item.Metadata()
 			if tr, ok := item.(*mediaprovider.Track); ok {
 				url, err = p.sm.Server.GetStreamURL(tr.ID, p.transcodeCfg.ForceRawFile)
 			} else {
@@ -564,9 +661,9 @@ func (p *playbackEngine) setTrack(idx int, next bool) error {
 			}
 		}
 		if next {
-			return urlP.SetNextFile(url)
+			return urlP.SetNextFile(url, meta)
 		}
-		return urlP.PlayFile(url)
+		return urlP.PlayFile(url, meta, startTime)
 	} else if trP, ok := p.player.(player.TrackPlayer); ok {
 		var track *mediaprovider.Track
 		if idx >= 0 {
@@ -578,13 +675,13 @@ func (p *playbackEngine) setTrack(idx int, next bool) error {
 		if next {
 			return trP.SetNextTrack(track)
 		}
-		return trP.PlayTrack(track)
+		return trP.PlayTrack(track, startTime)
 	}
 	panic("Unsupported player type")
 }
 
 func (p *playbackEngine) setNextTrack(idx int) error {
-	return p.setTrack(idx, true)
+	return p.setTrack(idx, true, 0)
 }
 
 // call BEFORE updating p.nowPlayingIdx
@@ -701,7 +798,7 @@ func (p *playbackEngine) doUpdateTimePos(seeked bool) {
 	if p.callbacksDisabled {
 		return
 	}
-	s := p.player.GetStatus()
+	s := p.PlaybackStatus()
 	if s.TimePos > p.latestTrackPosition {
 		p.latestTrackPosition = s.TimePos
 	}

backend/playbackmanager.go

@@ -7,12 +7,16 @@ import (
 	"math/rand"
 	"runtime"
 	"slices"
+	"sync"
 	"time"
 
 	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/backend/player"
+	"github.com/dweymouth/supersonic/backend/player/dlna"
 	"github.com/dweymouth/supersonic/backend/player/mpv"
 	"github.com/dweymouth/supersonic/sharedutil"
+	"github.com/supersonic-app/go-upnpcast/device"
+	"github.com/supersonic-app/go-upnpcast/services"
 )
 
 // A high-level MediaProvider-aware playback engine, serves as an
@@ -22,11 +26,23 @@ type PlaybackManager struct {
 	cmdQueue *playbackCommandQueue
 	cfg      *AppConfig
 
+	localPlayer         player.BasePlayer
+	remotePlayersLock   sync.Mutex
+	remotePlayers       []RemotePlaybackDevice
+	currentRemotePlayer *RemotePlaybackDevice
+
 	autoplay bool
 
 	lastPlayTime float64
 }
 
+type RemotePlaybackDevice struct {
+	Name     string
+	URL      string
+	Protocol string
+	new      func() (player.BasePlayer, error)
+}
+
 func NewPlaybackManager(
 	ctx context.Context,
 	s *ServerManager,
@@ -43,6 +59,7 @@ func NewPlaybackManager(
 		cmdQueue:    q,
 		cfg:         appCfg,
 		autoplay:    playbackCfg.Autoplay,
+		localPlayer: p,
 	}
 	pm.addOnTrackChangeHook()
 	go pm.runCmdQueue(ctx)
@@ -68,7 +85,7 @@ func (p *PlaybackManager) addOnTrackChangeHook() {
 			return
 		}
 		// workaround for https://github.com/dweymouth/supersonic/issues/483 (see above comment)
-		if p.NowPlayingIndex() != len(p.engine.playQueue) && p.PlayerStatus().State == player.Playing {
+		if p.NowPlayingIndex() != len(p.engine.playQueue) && p.PlaybackStatus().State == player.Playing {
 			p.lastPlayTime = 0
 			go func() {
 				time.Sleep(300 * time.Millisecond)
@@ -81,6 +98,68 @@ func (p *PlaybackManager) addOnTrackChangeHook() {
 	})
 }
 
+func (p *PlaybackManager) ScanRemotePlayers(ctx context.Context, fastScan bool) {
+	if fastScan {
+		p.scanRemotePlayers(ctx, 1 /*waitSec*/)
+		// continue to slow scan to detect players that take longer to respond
+	}
+	p.scanRemotePlayers(ctx, 10 /*waitSec*/)
+}
+
+func (p *PlaybackManager) scanRemotePlayers(ctx context.Context, waitSec int) {
+	devices, _ := device.SearchMediaRenderers(ctx, waitSec, services.AVTransport, services.RenderingControl)
+
+	var discovered []RemotePlaybackDevice
+	for _, d := range devices {
+		p := RemotePlaybackDevice{
+			Name:     d.FriendlyName,
+			URL:      d.URL,
+			Protocol: "DLNA",
+			new: func() (player.BasePlayer, error) {
+				return dlna.NewDLNAPlayer(d)
+			},
+		}
+		discovered = append(discovered, p)
+	}
+
+	p.remotePlayersLock.Lock()
+	p.remotePlayers = discovered
+	p.remotePlayersLock.Unlock()
+}
+
+func (p *PlaybackManager) RemotePlayers() []RemotePlaybackDevice {
+	p.remotePlayersLock.Lock()
+	players := p.remotePlayers
+	p.remotePlayersLock.Unlock()
+	return players
+}
+
+func (p *PlaybackManager) CurrentRemotePlayer() *RemotePlaybackDevice {
+	return p.currentRemotePlayer
+}
+
+func (p *PlaybackManager) SetRemotePlayer(rp *RemotePlaybackDevice) error {
+	p.cmdQueue.Clear()
+	if rp == nil {
+		if err := p.engine.SetPlayer(p.localPlayer); err != nil {
+			return err
+		}
+		p.currentRemotePlayer = nil
+		return nil
+	}
+
+	player, err := rp.new()
+	if err != nil {
+		return err
+	}
+	if err := p.engine.SetPlayer(player); err != nil {
+		return err
+	}
+
+	p.currentRemotePlayer = rp
+	return nil
+}
+
 func (p *PlaybackManager) CurrentPlayer() player.BasePlayer {
 	return p.engine.CurrentPlayer()
 }
@@ -397,8 +476,8 @@ func (p *PlaybackManager) IsAutoplay() bool {
 	return p.autoplay
 }
 
-func (p *PlaybackManager) PlayerStatus() player.Status {
-	return p.engine.PlayerStatus()
+func (p *PlaybackManager) PlaybackStatus() PlaybackStatus {
+	return p.engine.PlaybackStatus()
 }
 
 func (p *PlaybackManager) SetVolume(vol int) {
@@ -431,7 +510,7 @@ func (p *PlaybackManager) SeekSeconds(sec float64) {
 
 // Seek by given relative position in the current track by seconds.
 func (p *PlaybackManager) SeekBySeconds(sec float64) {
-	status := p.engine.PlayerStatus()
+	status := p.engine.PlaybackStatus()
 	target := status.TimePos + sec
 	if target < 0 {
 		target = 0
@@ -456,6 +535,10 @@ func (p *PlaybackManager) Stop() {
 	p.cmdQueue.Stop()
 }
 
+func (p *PlaybackManager) Shutdown() {
+	p.cmdQueue.StopAndWait()
+}
+
 func (p *PlaybackManager) Pause() {
 	p.cmdQueue.Pause()
 }
@@ -465,7 +548,7 @@ func (p *PlaybackManager) Continue() {
 }
 
 func (p *PlaybackManager) PlayPause() {
-	switch p.engine.PlayerStatus().State {
+	switch p.engine.PlaybackStatus().State {
 	case player.Playing:
 		p.Pause()
 	case player.Paused:
@@ -514,7 +597,7 @@ func (p *PlaybackManager) enqueueAutoplayTracks() {
 			if len(tr.ArtistIDs) > 0 {
 				similar, err := s.GetSimilarTracks(tr.ArtistIDs[0], p.cfg.EnqueueBatchSize)
 				if err != nil {
-					log.Println("autoplay error: failed to get similar tracks: %v", err)
+					log.Printf("autoplay error: failed to get similar tracks: %v", err)
 				}
 				tracks = filterRecentlyPlayed(similar)
 			}
@@ -527,7 +610,7 @@ func (p *PlaybackManager) enqueueAutoplayTracks() {
 					}
 					byGenre, err := s.GetRandomTracks(g, p.cfg.EnqueueBatchSize)
 					if err != nil {
-						log.Println("autoplay error: failed to get tracks by genre: %v", err)
+						log.Printf("autoplay error: failed to get tracks by genre: %v", err)
 					}
 					tracks = filterRecentlyPlayed(byGenre)
 					if len(tracks) > 0 {
@@ -542,7 +625,7 @@ func (p *PlaybackManager) enqueueAutoplayTracks() {
 			// fallback to random tracks
 			random, err := s.GetRandomTracks("", p.cfg.EnqueueBatchSize)
 			if err != nil {
-				log.Println("autoplay error: failed to get random tracks: %v", err)
+				log.Printf("autoplay error: failed to get random tracks: %v", err)
 			}
 			tracks = filterRecentlyPlayed(random)
 		}
@@ -556,7 +639,7 @@ func (p *PlaybackManager) enqueueAutoplayTracks() {
 func (p *PlaybackManager) runCmdQueue(ctx context.Context) {
 	logIfErr := func(action string, err error) {
 		if err != nil {
-			log.Println("Playback error (%s): %v", action, err)
+			log.Printf("Playback error (%s): %v", action, err)
 		}
 	}
 	for {
@@ -606,6 +689,9 @@ func (p *PlaybackManager) runCmdQueue(ctx context.Context) {
 					mpv.ForceRestartPlayback()
 				}
 			}
+			if c.OnDone != nil {
+				c.OnDone()
+			}
 		}
 	}
 }

backend/player/dlna/dlnaplayer.go

@@ -0,0 +1,665 @@
+package dlna
+
+import (
+	"context"
+	"crypto/md5"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
+	"github.com/dweymouth/supersonic/backend/player"
+	"github.com/dweymouth/supersonic/backend/util"
+	"github.com/hashicorp/go-retryablehttp"
+	"github.com/supersonic-app/go-upnpcast/device"
+	"github.com/supersonic-app/go-upnpcast/services/avtransport"
+	"github.com/supersonic-app/go-upnpcast/services/renderingcontrol"
+)
+
+const (
+	stopped = 0
+	playing = 1
+	paused  = 2
+)
+
+var unimplemented = errors.New("unimplemented")
+
+type proxyMapEntry struct {
+	key string
+	url string
+}
+
+type DLNAPlayer struct {
+	player.BasePlayerCallbackImpl
+
+	destroyed     bool
+	cancelRequest context.CancelFunc
+
+	avTransport   *avtransport.Client
+	renderControl *renderingcontrol.Client
+
+	state   int // stopped, playing, paused
+	seeking bool
+
+	metaLock      sync.Mutex
+	curTrackMeta  mediaprovider.MediaItemMetadata
+	nextTrackMeta mediaprovider.MediaItemMetadata
+
+	// if true, report playback time 00:00
+	// pending time sync with player after beginning playback
+	pendingPlayStart bool
+	// start playback position in seconds of the last seek/time sync
+	lastStartTime int
+	// how long the track has been playing since last time sync
+	stopwatch util.Stopwatch
+
+	proxyServer *http.Server
+	proxyActive atomic.Bool
+	localIP     string
+	proxyPort   int
+
+	pendingSeek     bool
+	pendingSeekSecs float64
+
+	// keep in order of most recently accessed at the end
+	// that way the item in proxyURLs[0] can be kicked out
+	// when adding a new URL to the proxy, since
+	// only two will need to be active at any given time
+	proxyURLs    [3]proxyMapEntry
+	proxyURLLock sync.Mutex
+
+	// If SetNextAVTransport fails (e.g. because the device
+	// does not support the API/gapless), this flag is set
+	// true, and the next firing of the track change timer
+	// should clear it to false and use SetAVTransport
+	// to begin playing the item in nextTrackMeta.
+	failedToSetNext    bool
+	unsetNextMediaItem *avtransport.MediaItem
+
+	timerActive atomic.Bool
+	timer       *time.Timer
+	resetChan   chan (time.Duration)
+}
+
+func NewDLNAPlayer(device *device.MediaRenderer) (*DLNAPlayer, error) {
+	retry := retryablehttp.NewClient()
+	retry.RetryMax = 3
+	retry.RetryWaitMin = 100 * time.Millisecond
+	retry.Logger = retryLogger{}
+	cli := retry.StandardClient()
+
+	avt, err := device.AVTransportClient()
+	if err != nil {
+		return nil, err
+	}
+	avt.HTTPClient = cli
+	rc, err := device.RenderingControlClient()
+	if err != nil {
+		return nil, err
+	}
+	rc.HTTPClient = cli
+
+	// ping to test connectivity
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	if _, err := avt.GetTransportInfo(ctx); err != nil {
+		return nil, fmt.Errorf("failed to connect to %s", device.FriendlyName)
+	}
+
+	return &DLNAPlayer{
+		avTransport:   avt,
+		renderControl: rc,
+		resetChan:     make(chan time.Duration),
+	}, nil
+}
+
+func (d *DLNAPlayer) SetVolume(vol int) error {
+	if d.destroyed {
+		return nil
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	d.cancelRequest = cancel
+	defer cancel()
+	return d.renderControl.SetVolume(ctx, vol)
+}
+
+func (d *DLNAPlayer) GetVolume() int {
+	if d.destroyed {
+		return 0
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	d.cancelRequest = cancel
+	defer cancel()
+	vol, _ := d.renderControl.GetVolume(ctx)
+	return vol
+}
+
+func (d *DLNAPlayer) PlayFile(urlstr string, meta mediaprovider.MediaItemMetadata, startTime float64) error {
+	if d.destroyed {
+		return nil
+	}
+
+	d.ensureSetupProxy()
+
+	d.metaLock.Lock()
+	d.curTrackMeta = meta
+	d.metaLock.Unlock()
+	key := d.addURLToProxy(urlstr)
+
+	media := avtransport.MediaItem{
+		URL:         d.urlForItem(key),
+		Title:       meta.Name,
+		ContentType: meta.MIMEType,
+		Seekable:    true,
+	}
+
+	if err := d.playAVTransportMedia(&media); err != nil {
+		return err
+	}
+	d.pendingPlayStart = true
+	if startTime > 0 {
+		// TODO: do something better than this!!
+		time.Sleep(2 * time.Second)
+		if !d.destroyed {
+			d.sendSeekCmd(startTime)
+		}
+		d.pendingPlayStart = false
+	} else {
+		go func() {
+			time.Sleep(2 * time.Second)
+			if !d.destroyed {
+				d.syncPlaybackTime()
+			}
+			d.pendingPlayStart = false
+		}()
+	}
+	d.state = playing
+	remainingDur := meta.Duration - int(startTime)
+	d.setTrackChangeTimer(time.Duration(remainingDur) * time.Second)
+	d.stopwatch.Reset()
+	d.stopwatch.Start()
+	d.lastStartTime = int(startTime)
+	d.InvokeOnPlaying()
+	d.InvokeOnTrackChange()
+	if startTime > 0 {
+		d.InvokeOnSeek()
+	}
+
+	return nil
+}
+
+func (d *DLNAPlayer) playAVTransportMedia(media *avtransport.MediaItem) error {
+	ctx, cancel := context.WithCancel(context.Background())
+	d.cancelRequest = cancel
+	defer cancel()
+
+	err := d.avTransport.SetAVTransportMedia(ctx, media)
+	if err != nil {
+		return err
+	}
+	if err := d.avTransport.Play(ctx); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *DLNAPlayer) SetNextFile(url string, meta mediaprovider.MediaItemMetadata) error {
+	if d.destroyed {
+		return nil
+	}
+
+	var media *avtransport.MediaItem
+	d.metaLock.Lock()
+	d.nextTrackMeta = meta
+	d.metaLock.Unlock()
+	if url != "" {
+		d.ensureSetupProxy()
+
+		key := d.addURLToProxy(url)
+		media = &avtransport.MediaItem{
+			URL:         d.urlForItem(key),
+			ContentType: meta.MIMEType,
+			Title:       meta.Name,
+			Seekable:    true,
+		}
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	d.cancelRequest = cancel
+	defer cancel()
+	err := d.avTransport.SetNextAVTransportMedia(ctx, media)
+	if err != nil {
+		d.metaLock.Lock()
+		d.failedToSetNext = true
+		d.unsetNextMediaItem = media
+		d.metaLock.Unlock()
+	}
+	return err
+}
+
+func (d *DLNAPlayer) Continue() error {
+	if d.destroyed || d.state == playing {
+		return nil
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	d.cancelRequest = cancel
+	defer cancel()
+
+	if d.pendingSeek {
+		d.pendingSeek = false
+		err := d.avTransport.Seek(ctx, int(d.pendingSeekSecs))
+		if err != nil {
+			return err
+		}
+	}
+
+	if err := d.avTransport.Play(ctx); err != nil {
+		return err
+	}
+	d.metaLock.Lock()
+	nextTrackChange := time.Duration(d.curTrackMeta.Duration)*time.Second - d.curPlayPos()
+	d.metaLock.Unlock()
+	d.state = playing
+	d.setTrackChangeTimer(nextTrackChange)
+	d.stopwatch.Start()
+	d.InvokeOnPlaying()
+	return nil
+}
+
+func (d *DLNAPlayer) Pause() error {
+	if d.destroyed || d.state != playing {
+		return nil
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	d.cancelRequest = cancel
+	defer cancel()
+	if err := d.avTransport.Pause(ctx); err != nil {
+		return err
+	}
+	d.setTrackChangeTimer(0)
+	d.stopwatch.Stop()
+	d.state = paused
+	d.InvokeOnPaused()
+	return nil
+}
+
+func (d *DLNAPlayer) Stop(force bool) error {
+	if d.destroyed {
+		return nil
+	}
+	if force && d.cancelRequest != nil {
+		d.cancelRequest()
+	}
+
+	switch d.state {
+	case stopped:
+		return nil
+	case playing:
+		var ctx context.Context
+		var cancel context.CancelFunc
+		if force {
+			ctx, cancel = context.WithTimeout(context.Background(), 2*time.Second)
+		} else {
+			ctx, cancel = context.WithCancel(context.Background())
+		}
+		d.cancelRequest = cancel
+		defer cancel()
+
+		if err := d.avTransport.Pause(ctx); err != nil {
+			return err
+		}
+		fallthrough
+	case paused:
+		d.setTrackChangeTimer(0)
+		d.stopwatch.Reset()
+		d.lastStartTime = 0
+		d.state = stopped
+		d.InvokeOnStopped()
+		return nil
+	default:
+		return errors.New("invalid player state")
+	}
+}
+
+func (d *DLNAPlayer) SeekSeconds(secs float64) error {
+	if d.destroyed {
+		return nil
+	}
+
+	if d.state == paused {
+		d.pendingSeek = true
+		d.pendingSeekSecs = secs
+	} else {
+		if err := d.sendSeekCmd(secs); err != nil {
+			return err
+		}
+	}
+
+	d.lastStartTime = int(secs)
+	d.stopwatch.Reset()
+
+	if d.state == playing {
+		d.metaLock.Lock()
+		nextTrackChange := time.Duration(d.curTrackMeta.Duration)*time.Second - time.Duration(secs)*time.Second
+		d.metaLock.Unlock()
+		d.setTrackChangeTimer(nextTrackChange)
+		d.stopwatch.Start()
+	}
+
+	d.InvokeOnSeek()
+
+	go func() {
+		time.Sleep(4 * time.Second)
+		if !d.destroyed {
+			d.syncPlaybackTime()
+		}
+	}()
+	return nil
+}
+
+func (d *DLNAPlayer) sendSeekCmd(secs float64) error {
+	d.seeking = true
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if err := d.avTransport.Seek(ctx, int(secs)); err != nil {
+		d.seeking = false
+		return err
+	}
+	d.seeking = false
+	return nil
+}
+
+func (d *DLNAPlayer) IsSeeking() bool {
+	return d.seeking
+}
+
+func (d *DLNAPlayer) GetStatus() player.Status {
+	state := player.Stopped
+	if d.state == playing {
+		state = player.Playing
+	} else if d.state == paused {
+		state = player.Paused
+	}
+
+	var timePos float64
+	if !d.pendingPlayStart {
+		timePos = d.curPlayPos().Seconds()
+	}
+	return player.Status{
+		State:    state,
+		TimePos:  timePos,
+		Duration: float64(d.curTrackMeta.Duration),
+	}
+}
+
+func (d *DLNAPlayer) curPlayPos() time.Duration {
+	return time.Duration(d.lastStartTime)*time.Second + d.stopwatch.Elapsed()
+}
+
+func (d *DLNAPlayer) Destroy() {
+	d.destroyed = true
+	d.setTrackChangeTimer(0)
+	if d.cancelRequest != nil {
+		d.cancelRequest()
+	}
+
+	if d.proxyServer != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+		defer cancel()
+		go d.proxyServer.Shutdown(ctx)
+		d.proxyServer = nil
+	}
+}
+
+func (d *DLNAPlayer) syncPlaybackTime() {
+	start := time.Now()
+	if pos, err := d.avTransport.GetPositionInfo(context.Background()); err == nil {
+		d.lastStartTime = int(pos.RelTime.Seconds() + (time.Since(start) / 2).Seconds())
+		d.stopwatch.Reset()
+		if d.state == playing {
+			d.stopwatch.Start()
+		}
+		d.setTrackChangeTimer(time.Duration(d.curTrackMeta.Duration-d.lastStartTime) * time.Second)
+		d.InvokeOnSeek()
+	}
+}
+
+func (d *DLNAPlayer) ensureSetupProxy() error {
+	if d.proxyActive.Swap(true) {
+		return nil // already active
+	}
+
+	var err error
+	d.localIP, err = util.GetLocalIP()
+	if err != nil {
+		return err
+	}
+
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		return err
+	}
+	d.proxyPort = listener.Addr().(*net.TCPAddr).Port
+
+	d.proxyServer = &http.Server{
+		Handler: http.HandlerFunc(d.handleRequest),
+	}
+
+	go d.proxyServer.Serve(listener)
+	return nil
+}
+
+func (d *DLNAPlayer) setTrackChangeTimer(dur time.Duration) {
+	if d.timerActive.Swap(true) {
+		// was active
+		d.resetChan <- dur
+		return
+	}
+	if dur == 0 {
+		d.timerActive.Store(false)
+		return
+	}
+
+	d.timer = time.NewTimer(dur)
+	go func() {
+		for {
+			select {
+			case dur := <-d.resetChan:
+				if dur == 0 {
+					d.timerActive.Store(false)
+					if !d.timer.Stop() {
+						select {
+						case <-d.timer.C:
+						default:
+						}
+					}
+					d.timer = nil
+					return
+				}
+				// reset the timer
+				if !d.timer.Stop() {
+					select {
+					case <-d.timer.C:
+					default:
+					}
+				}
+				d.timer.Reset(dur)
+			case <-d.timer.C:
+				d.timerActive.Store(false)
+				d.timer = nil
+				d.handleOnTrackChange()
+				return
+			}
+		}
+	}()
+}
+
+func (d *DLNAPlayer) handleOnTrackChange() {
+	stopping := false
+	d.metaLock.Lock()
+	if d.nextTrackMeta.ID == "" {
+		stopping = true
+	}
+	d.curTrackMeta = d.nextTrackMeta
+	d.nextTrackMeta = mediaprovider.MediaItemMetadata{}
+	nextTrackChange := time.Duration(d.curTrackMeta.Duration) * time.Second
+	d.metaLock.Unlock()
+
+	if stopping {
+		d.lastStartTime = 0
+		d.stopwatch.Reset()
+		d.InvokeOnStopped()
+	} else {
+		d.metaLock.Lock()
+		if d.failedToSetNext {
+			d.failedToSetNext = false
+			media := d.unsetNextMediaItem
+			d.unsetNextMediaItem = nil
+			d.metaLock.Unlock()
+			d.playAVTransportMedia(media)
+		} else {
+			d.metaLock.Unlock()
+		}
+
+		d.lastStartTime = 0
+		d.stopwatch.Reset()
+		d.stopwatch.Start()
+		d.setTrackChangeTimer(nextTrackChange)
+		d.InvokeOnTrackChange()
+
+		go func() {
+			time.Sleep(5 * time.Second)
+			if !d.destroyed {
+				d.syncPlaybackTime()
+			}
+		}()
+	}
+}
+
+func (d *DLNAPlayer) urlForItem(key string) string {
+	return fmt.Sprintf("http://%s:%d/%s", d.localIP, d.proxyPort, key)
+}
+
+func (d *DLNAPlayer) handleRequest(w http.ResponseWriter, r *http.Request) {
+	key := strings.TrimPrefix(r.URL.Path, "/")
+	url, _ := d.lookupProxyURL(key)
+
+	if url == "" {
+		w.WriteHeader(http.StatusNotFound)
+		w.Write([]byte("404"))
+		return
+	}
+
+	// Create a new request to the target server
+	proxyReq, err := http.NewRequest(r.Method, url, r.Body)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	// Copy headers from the original request to the new request
+	proxyReq.Header = r.Header
+
+	// Create an HTTP client and send the request
+	client := &http.Client{}
+	resp, err := client.Do(proxyReq)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadGateway)
+		return
+	}
+	defer resp.Body.Close()
+
+	// Copy headers from the response to the writer
+	for name, values := range resp.Header {
+		for _, value := range values {
+			w.Header().Add(name, value)
+		}
+	}
+
+	// Set the status code
+	w.WriteHeader(resp.StatusCode)
+
+	// Copy the response body to the writer
+	_, err = io.Copy(w, resp.Body)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Error copying response body:", err)
+	}
+}
+
+func (d *DLNAPlayer) addURLToProxy(url string) string {
+	hash := md5.Sum([]byte(url))
+	key := base64.StdEncoding.EncodeToString(hash[:])
+	d.proxyURLLock.Lock()
+	defer d.proxyURLLock.Unlock()
+	d._updateProxyURL(key, url)
+	return key
+}
+
+// lookupProxyURL finds a URL by key and updates its position to most recently used
+func (d *DLNAPlayer) lookupProxyURL(key string) (string, bool) {
+	d.proxyURLLock.Lock()
+	defer d.proxyURLLock.Unlock()
+
+	for i := 0; i < len(d.proxyURLs); i++ {
+		if d.proxyURLs[i].key == key {
+			url := d.proxyURLs[i].url
+			// Move accessed entry to the most recent position
+			d._updateProxyURL(key, url)
+			return url, true
+		}
+	}
+
+	return "", false
+}
+
+func (d *DLNAPlayer) _updateProxyURL(key, url string) {
+	// Check if the key already exists, and if so, move it to the most recently used position
+	for i := 0; i < len(d.proxyURLs); i++ {
+		if d.proxyURLs[i].key == key {
+			if i < len(d.proxyURLs)-1 {
+				// Shift elements to the left from found position to the end
+				copy(d.proxyURLs[i:], d.proxyURLs[i+1:])
+			}
+			// Place updated entry at the last position
+			d.proxyURLs[len(d.proxyURLs)-1] = proxyMapEntry{key: key, url: url}
+			return
+		}
+	}
+
+	// Shift all elements left to make room for the new entry at the end
+	copy(d.proxyURLs[:], d.proxyURLs[1:])
+	// Insert new element at the most recent position
+	d.proxyURLs[len(d.proxyURLs)-1] = proxyMapEntry{key: key, url: url}
+}
+
+type retryLogger struct{}
+
+func (retryLogger) Error(msg string, keysAndValues ...interface{}) {
+	log.Println(msg, keysAndValues)
+}
+
+func (retryLogger) Info(msg string, keysAndValues ...interface{}) {
+	log.Println(msg, keysAndValues)
+}
+
+func (retryLogger) Warn(msg string, keysAndValues ...interface{}) {
+	log.Println(msg, keysAndValues)
+}
+
+func (retryLogger) Debug(msg string, keysAndValues ...interface{}) {
+	// log only retries, not every request
+	if strings.Contains(msg, "retrying request") {
+		log.Println(msg, keysAndValues)
+	}
+}

backend/player/jukebox/jukeboxplayer.go

@@ -68,7 +68,7 @@ func (j *JukeboxPlayer) Pause() error {
 	return nil
 }
 
-func (j *JukeboxPlayer) Stop() error {
+func (j *JukeboxPlayer) Stop(_ bool) error {
 	if j.state == stopped {
 		return nil
 	}
@@ -80,7 +80,7 @@ func (j *JukeboxPlayer) Stop() error {
 	return nil
 }
 
-func (j *JukeboxPlayer) PlayTrack(track *mediaprovider.Track) error {
+func (j *JukeboxPlayer) PlayTrack(track *mediaprovider.Track, _ float64) error {
 	if err := j.provider.JukeboxSet(track.ID); err != nil {
 		return err
 	}
@@ -140,6 +140,8 @@ func (j *JukeboxPlayer) GetStatus() player.Status {
 	}
 }
 
+func (j *JukeboxPlayer) Destroy() {}
+
 func (j *JukeboxPlayer) startAndUpdateTime() error {
 	beforeStart := time.Now()
 	if err := j.provider.JukeboxStart(); err != nil {

backend/player/mpv/player.go

@@ -6,7 +6,9 @@ import (
 	"fmt"
 	"math"
 	"strconv"
+	"sync"
 
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 	"github.com/dweymouth/supersonic/backend/player"
 	"github.com/supersonic-app/go-mpv"
 )
@@ -67,6 +69,9 @@ type Player struct {
 	equalizer      Equalizer
 	peaksEnabled   bool
 
+	fileLoadedLock sync.Mutex
+	fileLoadedSig  *sync.Cond
+
 	bgCancel context.CancelFunc
 }
 
@@ -79,10 +84,12 @@ func New() *Player {
 // Same as New, but sets the application name that mpv
 // reports to the system audio API.
 func NewWithClientName(c string) *Player {
-	return &Player{
+	p := &Player{
 		vol:        -1, // use 100 in Init
 		clientName: c,
 	}
+	p.fileLoadedSig = sync.NewCond(&p.fileLoadedLock)
+	return p
 }
 
 // Initializes the Player and makes it ready for playback.
@@ -133,23 +140,32 @@ func (p *Player) Init(maxCacheMB int) error {
 }
 
 // Plays the specified file, clearing the previous play queue, if any.
-func (p *Player) PlayFile(url string) error {
+func (p *Player) PlayFile(url string, _ mediaprovider.MediaItemMetadata, startTime float64) error {
 	if !p.initialized {
 		return ErrUnitialized
 	}
 	err := p.mpv.Command([]string{"loadfile", url, "replace"})
-	if err == nil {
+	if err != nil {
+		return err
+	}
 	p.lenPlaylist = 1
 	if p.status.State == player.Paused {
-			return p.Continue()
-		}
+		err = p.Continue()
+	} else {
 		p.setState(player.Playing)
 	}
+	if startTime > 0 {
+		p.fileLoadedLock.Lock()
+		p.fileLoadedSig.Wait()
+		p.fileLoadedLock.Unlock()
+		p.SeekSeconds(startTime)
+	}
+
 	return err
 }
 
 // Stops playback and clears the play queue.
-func (p *Player) Stop() error {
+func (p *Player) Stop(_ bool) error {
 	if !p.initialized {
 		return ErrUnitialized
 	}
@@ -169,7 +185,7 @@ func (p *Player) Stop() error {
 	return err
 }
 
-func (p *Player) SetNextFile(url string) error {
+func (p *Player) SetNextFile(url string, _ mediaprovider.MediaItemMetadata) error {
 	if p.lenPlaylist > p.curPlaylistPos+1 {
 		if err := p.mpv.Command([]string{"playlist-remove", strconv.Itoa(int(p.curPlaylistPos) + 1)}); err != nil {
 			return err
@@ -480,10 +496,9 @@ func (p *Player) eventHandler(ctx context.Context) {
 			}
 			switch e.Event_Id {
 			case mpv.EVENT_PLAYBACK_RESTART:
-				if p.seeking {
-					p.seeking = false
-				}
+				fallthrough
 			case mpv.EVENT_SEEK:
+				p.seeking = false
 				p.InvokeOnSeek()
 			case mpv.EVENT_FILE_LOADED:
 				p.curPlaylistPos, _ = p.getInt64Property("playlist-pos")
@@ -493,6 +508,7 @@ func (p *Player) eventHandler(ctx context.Context) {
 					p.InvokeOnSeek()
 				}
 				p.InvokeOnTrackChange()
+				p.fileLoadedSig.Signal()
 			case mpv.EVENT_IDLE:
 				p.status.Duration = 0
 				p.status.TimePos = 0

backend/player/player.go

@@ -1,23 +1,25 @@
 package player
 
-import "github.com/dweymouth/supersonic/backend/mediaprovider"
+import (
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
+)
 
 type URLPlayer interface {
 	BasePlayer
-	PlayFile(url string) error
-	SetNextFile(url string) error
+	PlayFile(url string, metadata mediaprovider.MediaItemMetadata, startTime float64) error
+	SetNextFile(url string, metadata mediaprovider.MediaItemMetadata) error
 }
 
 type TrackPlayer interface {
 	BasePlayer
-	PlayTrack(track *mediaprovider.Track) error
+	PlayTrack(track *mediaprovider.Track, startTime float64) error
 	SetNextTrack(track *mediaprovider.Track) error
 }
 
 type BasePlayer interface {
 	Continue() error
 	Pause() error
-	Stop() error
+	Stop(force bool) error
 
 	SeekSeconds(secs float64) error
 	IsSeeking() bool
@@ -27,6 +29,8 @@ type BasePlayer interface {
 
 	GetStatus() Status
 
+	Destroy()
+
 	// Event API
 	OnPaused(func())
 	OnStopped(func())
@@ -84,66 +88,66 @@ func (r ReplayGainMode) String() string {
 }
 
 type BasePlayerCallbackImpl struct {
-	onPaused      []func()
-	onStopped     []func()
-	onPlaying     []func()
-	onSeek        []func()
-	onTrackChange []func()
+	onPaused      func()
+	onStopped     func()
+	onPlaying     func()
+	onSeek        func()
+	onTrackChange func()
 }
 
-// Registers a callback which is invoked when the player transitions to the Paused state.
+// Sets a callback which is invoked when the player transitions to the Paused state.
 func (p *BasePlayerCallbackImpl) OnPaused(cb func()) {
-	p.onPaused = append(p.onPaused, cb)
+	p.onPaused = cb
 }
 
-// Registers a callback which is invoked when the player transitions to the Stopped state.
+// Sets a callback which is invoked when the player transitions to the Stopped state.
 func (p *BasePlayerCallbackImpl) OnStopped(cb func()) {
-	p.onStopped = append(p.onStopped, cb)
+	p.onStopped = cb
 }
 
-// Registers a callback which is invoked when the player transitions to the Playing state.
+// Sets a callback which is invoked when the player transitions to the Playing state.
 func (p *BasePlayerCallbackImpl) OnPlaying(cb func()) {
-	p.onPlaying = append(p.onPlaying, cb)
+	p.onPlaying = cb
 }
 
 // Registers a callback which is invoked whenever a seek event occurs.
 func (p *BasePlayerCallbackImpl) OnSeek(cb func()) {
-	p.onSeek = append(p.onSeek, cb)
+	p.onSeek = cb
 }
 
 // Registers a callback which is invoked when the currently playing track changes,
 // or when playback begins at any time from the Stopped state.
 // Callback is invoked with the index of the currently playing track (zero-based).
 func (p *BasePlayerCallbackImpl) OnTrackChange(cb func()) {
-	p.onTrackChange = append(p.onTrackChange, cb)
+	p.onTrackChange = cb
 }
 
 func (p *BasePlayerCallbackImpl) InvokeOnPaused() {
-	for _, cb := range p.onPaused {
-		cb()
+	if p.onPaused != nil {
+		p.onPaused()
 	}
 }
 
 func (p *BasePlayerCallbackImpl) InvokeOnPlaying() {
-	for _, cb := range p.onPlaying {
-		cb()
+	if p.onPlaying != nil {
+		p.onPlaying()
 	}
 }
 
 func (p *BasePlayerCallbackImpl) InvokeOnStopped() {
-	for _, cb := range p.onStopped {
-		cb()
+	if p.onStopped != nil {
+		p.onStopped()
 	}
 }
 
 func (p *BasePlayerCallbackImpl) InvokeOnSeek() {
-	for _, cb := range p.onSeek {
-		cb()
+	if p.onSeek != nil {
+		p.onSeek()
 	}
 }
 
 func (p *BasePlayerCallbackImpl) InvokeOnTrackChange() {
-	for _, cb := range p.onTrackChange {
-		cb()
+	if p.onTrackChange != nil {
+		p.onTrackChange()
 	}
 }

backend/savedplayqueue.go

@@ -26,7 +26,7 @@ type serializedSavedPlayQueue struct {
 // If the provided CanSavePlayQueue server is non-nil, it will also save to the server.
 func SavePlayQueue(serverID string, pm *PlaybackManager, filepath string, server mediaprovider.CanSavePlayQueue) error {
 	queue := pm.GetPlayQueue()
-	stats := pm.PlayerStatus()
+	stats := pm.PlaybackStatus()
 	trackIdx := pm.NowPlayingIndex()
 
 	trackIDs := make([]string, 0, len(queue))

backend/util/util.go

@@ -1,7 +1,9 @@
 package util
 
 import (
+	"fmt"
 	"io"
+	"net"
 	"os"
 )
 
@@ -21,3 +23,30 @@ func CopyFile(srcPath, dstPath string) error {
 	_, err = io.Copy(fout, fin)
 	return err
 }
+
+func GetLocalIP() (string, error) {
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return "", err
+	}
+
+	for _, iface := range interfaces {
+		if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+			continue
+		}
+
+		addrs, err := iface.Addrs()
+		if err != nil {
+			return "", err
+		}
+
+		for _, addr := range addrs {
+			ipnet, ok := addr.(*net.IPNet)
+			if ok && !ipnet.IP.IsLoopback() && ipnet.IP.To4() != nil {
+				return ipnet.IP.String(), nil
+			}
+		}
+	}
+
+	return "", fmt.Errorf("no suitable interface found")
+}

go.mod

@@ -1,6 +1,6 @@
 module github.com/dweymouth/supersonic
 
-go 1.21
+go 1.21.9
 
 require (
 	fyne.io/fyne/v2 v2.6.0-beta1
@@ -14,12 +14,14 @@ require (
 	github.com/dweymouth/go-jellyfin v0.0.0-20240517151952-5ceca61cb645
 	github.com/godbus/dbus/v5 v5.1.0
 	github.com/google/uuid v1.3.0
+	github.com/hashicorp/go-retryablehttp v0.7.7
 	github.com/pelletier/go-toml/v2 v2.0.8
 	github.com/quarckster/go-mpris-server v1.0.3
 	github.com/supersonic-app/go-mpv v0.1.0
 	github.com/supersonic-app/go-subsonic v0.0.0-20241224013245-9b2841f3711d
+	github.com/supersonic-app/go-upnpcast v0.0.0-20250330154256-b957204209a5
 	github.com/zalando/go-keyring v0.2.6
-	golang.org/x/net v0.25.0
+	golang.org/x/net v0.33.0
 	golang.org/x/sys v0.30.0
 	golang.org/x/text v0.22.0
 )
@@ -39,8 +41,11 @@ require (
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20240506104042-037f3cc74f2a // indirect
 	github.com/go-text/render v0.2.0 // indirect
 	github.com/go-text/typesetting v0.2.1 // indirect
+	github.com/h2non/filetype v1.1.3 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/jeandeaual/go-locale v0.0.0-20241217141322-fcc2cadd6f08 // indirect
 	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 // indirect
+	github.com/koron/go-ssdp v0.0.5 // indirect
 	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
 	github.com/nicksnyder/go-i18n/v2 v2.5.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect

go.sum

@@ -27,6 +27,8 @@ github.com/dweymouth/fyne/v2 v2.3.0-rc1.0.20250308154116-c32a0de49bde h1:vSJQkJW
 github.com/dweymouth/fyne/v2 v2.3.0-rc1.0.20250308154116-c32a0de49bde/go.mod h1:ON11afuS9jVyN+nfEtITv3jX1H+JD+Z50gxCiEC1zLw=
 github.com/dweymouth/go-jellyfin v0.0.0-20240517151952-5ceca61cb645 h1:KzqSaQwG3HsTZQlEtkp0BeUy9vmYZ0rq0B15qIPSiBs=
 github.com/dweymouth/go-jellyfin v0.0.0-20240517151952-5ceca61cb645/go.mod h1:fcUagHBaQnt06GmBAllNE0J4O/7064zXRWdqnTTtVjI=
+github.com/fatih/color v1.16.0 h1:zmkK9Ngbjj+K0yRhTVONQh1p/HknKYSlNT+vZCzyokM=
+github.com/fatih/color v1.16.0/go.mod h1:fL2Sau1YI5c0pdGEVCbKQbLXB6edEj1ZgiY4NijnWvE=
 github.com/felixge/fgprof v0.9.3 h1:VvyZxILNuCiUCSXtPtYmmtGvb65nqXh2QFWc0Wpf2/g=
 github.com/felixge/fgprof v0.9.3/go.mod h1:RdbpDgzqYVh/T9fPELJyV7EYJuHB55UTEULNun8eiPw=
 github.com/fredbi/uri v1.1.0 h1:OqLpTXtyRg9ABReqvDGdJPqZUxs8cyBDOMXBbskCaB8=
@@ -57,12 +59,26 @@ github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaU
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/h2non/filetype v1.1.3 h1:FKkx9QbD7HR/zjK1Ia5XiBsq9zdLi5Kf3zGyFTAFkGg=
+github.com/h2non/filetype v1.1.3/go.mod h1:319b3zT68BvV+WRj7cwy856M2ehB3HqNOt6sy1HndBY=
+github.com/hashicorp/go-cleanhttp v0.5.2 h1:035FKYIWjmULyFRBKPs8TBQoi0x6d9G4xc9neXJWAZQ=
+github.com/hashicorp/go-cleanhttp v0.5.2/go.mod h1:kO/YDlP8L1346E6Sodw+PrpBSV4/SoxCXGY6BqNFT48=
+github.com/hashicorp/go-hclog v1.6.3 h1:Qr2kF+eVWjTiYmU7Y31tYlP1h0q/X3Nl3tPGdaB11/k=
+github.com/hashicorp/go-hclog v1.6.3/go.mod h1:W4Qnvbt70Wk/zYJryRzDRU/4r0kIg0PVHBcfoyhpF5M=
+github.com/hashicorp/go-retryablehttp v0.7.7 h1:C8hUCYzor8PIfXHa4UrZkU4VvK8o9ISHxT2Q8+VepXU=
+github.com/hashicorp/go-retryablehttp v0.7.7/go.mod h1:pkQpWZeYWskR+D1tR2O5OcBFOxfA7DoAO6xtkuQnHTk=
 github.com/jeandeaual/go-locale v0.0.0-20241217141322-fcc2cadd6f08 h1:wMeVzrPO3mfHIWLZtDcSaGAe2I4PW9B/P5nMkRSwCAc=
 github.com/jeandeaual/go-locale v0.0.0-20241217141322-fcc2cadd6f08/go.mod h1:ZDXo8KHryOWSIqnsb/CiDq7hQUYryCgdVnxbj8tDG7o=
 github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 h1:YLvr1eE6cdCqjOe972w/cYF+FjW34v27+9Vo5106B4M=
 github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25/go.mod h1:kLgvv7o6UM+0QSf0QjAse3wReFDsb9qbZJdfexWlrQw=
+github.com/koron/go-ssdp v0.0.5 h1:E1iSMxIs4WqxTbIBLtmNBeOOC+1sCIXQeqTWVnpmwhk=
+github.com/koron/go-ssdp v0.0.5/go.mod h1:Qm59B7hpKpDqfyRNWRNr00jGwLdXjDyZh6y7rH6VS0w=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 github.com/nicksnyder/go-i18n/v2 v2.5.1 h1:IxtPxYsR9Gp60cGXjfuR/llTqV8aYMsC472zD0D1vHk=
@@ -97,6 +113,8 @@ github.com/supersonic-app/go-mpv v0.1.0 h1:U+cCnLQxmpqx5mY6nMlC0J4uIdCCXUbAjpjS0
 github.com/supersonic-app/go-mpv v0.1.0/go.mod h1:1bQz6kBQumJopXEbkiqoLxIXLy7F7yWFBvknvpAtIC0=
 github.com/supersonic-app/go-subsonic v0.0.0-20241224013245-9b2841f3711d h1:70+Nn7yh+cfeKqqXVTdpneFqXuvrBLyP7U6GVUsjTU4=
 github.com/supersonic-app/go-subsonic v0.0.0-20241224013245-9b2841f3711d/go.mod h1:D+OWPXeD9owcdcoXATv5YPBGWxxVvn5k98rt5B4wMc4=
+github.com/supersonic-app/go-upnpcast v0.0.0-20250330154256-b957204209a5 h1:aoUJKPFD/ZrNZjK6fl2Xhazwsttx42esKxhSSzEE3Bo=
+github.com/supersonic-app/go-upnpcast v0.0.0-20250330154256-b957204209a5/go.mod h1:ibt19zDV5/vvF14jHJpTv3AOorq1EbmrMAubxnuvR5Y=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 github.com/yuin/goldmark v1.7.8 h1:iERMLn0/QJeHFhxSt3p6PeN9mGnvIKSpG9YYorDMnic=
 github.com/yuin/goldmark v1.7.8/go.mod h1:uzxRWxtg69N339t3louHJ7+O03ezfj6PlliRlaOzY1E=
@@ -113,8 +131,8 @@ golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
-golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
-golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/net v0.33.0 h1:74SYHlV8BIgHIFC/LrYkOGIwL19eTYXQ5wc6TBuO36I=
+golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=

res/bundled_gen.sh

@@ -3,6 +3,7 @@
 fyne bundle -package res -prefix Res appicon-256.png > bundled.go
 fyne bundle -append -prefix Res icons/coreui/playlist-add-next.svg >> bundled.go
 fyne bundle -append -prefix Res icons/freepik/playbutton.png >> bundled.go
+fyne bundle -append -prefix Res icons/publicdomain/cast.svg >> bundled.go
 fyne bundle -append -prefix Res icons/publicdomain/disc.svg >> bundled.go
 fyne bundle -append -prefix Res icons/publicdomain/headphones.svg >> bundled.go
 fyne bundle -append -prefix Res icons/publicdomain/heart-filled.svg >> bundled.go

res/icons/publicdomain/cast.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
+<svg fill="#000000" width="800px" height="800px" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" d="M1,21 L1,19 C2.1045695,19 3,19.8954305 3,21 L1,21 Z M7,21 L5,21 C5,18.790861 3.209139,17 1,17 L1,15 C4.3137085,15 7,17.6862915 7,21 Z M11,21 L9,21 C9,16.581722 5.418278,13 1,13 L1,11 C6.5228475,11 11,15.4771525 11,21 Z M3,9 L1,9 L1,5 C1,3.8954305 1.8954305,3 3,3 L21,3 C22.1045695,3 23,3.8954305 23,5 L23,19 C23,20.1045695 22.1045695,21 21,21 L13,21 L13,19 L21,19 L21,5 L3,5 L3,9 Z"/>
+</svg>

res/translations/en.json

@@ -207,6 +207,7 @@
     "Testing connection": "Testing connection",
     "The request timed out": "The request timed out",
     "Theme": "Theme",
+    "This computer": "This computer",
     "Time": "Time",
     "Title": "Title",
     "Title (A-Z)": "Title (A-Z)",

ui/bottompanel.go

@@ -3,6 +3,7 @@ package ui
 import (
 	"github.com/dweymouth/supersonic/backend"
 	"github.com/dweymouth/supersonic/backend/mediaprovider"
+	"github.com/dweymouth/supersonic/backend/player/mpv"
 	"github.com/dweymouth/supersonic/ui/controller"
 	"github.com/dweymouth/supersonic/ui/layouts"
 	"github.com/dweymouth/supersonic/ui/util"
@@ -111,6 +112,10 @@ func NewBottomPanel(pm *backend.PlaybackManager, im *backend.ImageManager, contr
 	pm.OnVolumeChange(func(vol int) {
 		fyne.Do(func() { bp.AuxControls.VolumeControl.SetVolume(vol) })
 	})
+	pm.OnPlayerChange(func() {
+		_, local := pm.CurrentPlayer().(*mpv.Player)
+		fyne.Do(func() { bp.AuxControls.SetIsRemotePlayer(!local) })
+	})
 	bp.AuxControls.VolumeControl.OnSetVolume = func(v int) {
 		pm.SetVolume(v)
 	}
@@ -121,6 +126,7 @@ func NewBottomPanel(pm *backend.PlaybackManager, im *backend.ImageManager, contr
 		pm.SetAutoplay(autoplay)
 	}
 	bp.AuxControls.OnShowPlayQueue(contr.ShowPopUpPlayQueue)
+	bp.AuxControls.OnShowCastMenu(contr.ShowCastMenu)
 
 	bp.imageLoader = util.NewThumbnailLoader(im, bp.NowPlaying.SetImage)
 

ui/browsing/nowplayingpage.go

@@ -443,7 +443,7 @@ func (a *NowPlayingPage) Reload() {
 	}
 	switch a.tabs.SelectedIndex() {
 	case 1: /*lyrics*/
-		a.lastPlayPos = a.pm.CurrentPlayer().GetStatus().TimePos
+		a.lastPlayPos = a.pm.PlaybackStatus().TimePos
 		a.updateLyrics()
 	case 2: /*related*/
 		a.updateRelatedList()
@@ -527,7 +527,7 @@ func (a *NowPlayingPage) saveSelectedTab(tabNum int) {
 
 func (a *NowPlayingPage) formatStatusLine() {
 	curPlayer := a.pm.CurrentPlayer()
-	playerStats := curPlayer.GetStatus()
+	playerStats := a.pm.PlaybackStatus()
 	lastStatus := a.statusLabel.Text
 	stopped := lang.L("Stopped")
 	state := stopped

ui/controller/controller.go

@@ -151,6 +151,50 @@ func (m *Controller) HaveModal() bool {
 	return m.haveModal
 }
 
+func (m *Controller) ShowCastMenu(onPendingPlayerChange func()) {
+	rp := m.App.PlaybackManager.CurrentRemotePlayer()
+	devices := m.App.PlaybackManager.RemotePlayers()
+	local := fyne.NewMenuItem(lang.L("This computer"), func() {
+		if rp == nil {
+			return // no-op. already not casting
+		}
+		onPendingPlayerChange()
+		go func() {
+			if err := m.App.PlaybackManager.SetRemotePlayer(nil); err != nil {
+				fyne.Do(func() { m.ToastProvider.ShowErrorToast("Failed to disconnect from remote player") })
+			}
+		}()
+	})
+	local.Icon = theme.ComputerIcon()
+	local.Checked = rp == nil
+
+	menu := fyne.NewMenu("", local)
+	for _, d := range devices {
+		_d := d
+		isCurrent := rp != nil && _d.URL == rp.URL
+		item := fyne.NewMenuItem(d.Name, func() {
+			if isCurrent {
+				return // no-op.
+			}
+			onPendingPlayerChange()
+			go func() {
+				if err := m.App.PlaybackManager.SetRemotePlayer(&_d); err != nil {
+					fyne.Do(func() { m.ToastProvider.ShowErrorToast("Failed to connect to " + _d.Name) })
+				}
+			}()
+		})
+		item.Icon = myTheme.CastIcon
+		item.Checked = isCurrent
+		menu.Items = append(menu.Items, item)
+	}
+	pop := widget.NewPopUpMenu(menu, m.MainWindow.Canvas())
+	canvasSize := m.MainWindow.Canvas().Size()
+	pop.ShowAtPosition(fyne.NewPos(
+		canvasSize.Width-pop.MinSize().Width-10,
+		canvasSize.Height-pop.MinSize().Height-100,
+	))
+}
+
 func (m *Controller) ShowPopUpPlayQueue() {
 	m.popUpQueueMutex.Lock()
 	if m.popUpQueue == nil {
@@ -270,6 +314,7 @@ func (c *Controller) ShowAboutDialog() {
 }
 
 func (c *Controller) ShowSettingsDialog(themeUpdateCallbk func(), themeFiles map[string]string) {
+
 	devs, err := c.App.LocalPlayer.ListAudioDevices()
 	if err != nil {
 		log.Printf("error listing audio devices: %v", err)
@@ -282,6 +327,7 @@ func (c *Controller) ShowSettingsDialog(themeUpdateCallbk func(), themeFiles map
 	_, canSavePlayQueue := c.App.ServerManager.Server.(mediaprovider.CanSavePlayQueue)
 	isLocalPlayer := isEqualizerPlayer
 	bands := c.App.LocalPlayer.Equalizer().BandFrequencies()
+
 	dlg := dialogs.NewSettingsDialog(c.App.Config,
 		devs, themeFiles, bands,
 		c.App.ServerManager.Server.ClientDecidesScrobble(),
@@ -317,6 +363,7 @@ func (c *Controller) ShowSettingsDialog(themeUpdateCallbk func(), themeFiles map
 	c.ClosePopUpOnEscape(pop)
 	c.haveModal = true
 	pop.Show()
+
 }
 
 func (c *Controller) doModalClosed() {

ui/controller/visualizations.go

@@ -7,6 +7,7 @@ import (
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/lang"
 	"github.com/dweymouth/supersonic/backend/player"
+	"github.com/dweymouth/supersonic/backend/player/mpv"
 	"github.com/dweymouth/supersonic/ui/shortcuts"
 	"github.com/dweymouth/supersonic/ui/util"
 	"github.com/dweymouth/supersonic/ui/visualizations"
@@ -21,12 +22,14 @@ type visualizationData struct {
 }
 
 func (c *Controller) initVisualizations() {
-	c.App.LocalPlayer.OnStopped(c.stopVisualizationAnim)
-	c.App.LocalPlayer.OnPaused(c.stopVisualizationAnim)
-	c.App.LocalPlayer.OnPlaying(func() {
+	c.App.PlaybackManager.OnStopped(c.stopVisualizationAnim)
+	c.App.PlaybackManager.OnPaused(c.stopVisualizationAnim)
+	c.App.PlaybackManager.OnPlaying(func() {
+		if _, ok := c.App.PlaybackManager.CurrentPlayer().(*mpv.Player); ok {
 			if c.peakMeter != nil {
 				c.startVisualizationAnim()
 			}
+		}
 	})
 }
 
@@ -71,13 +74,13 @@ func (c *Controller) stopVisualizationAnim() {
 	if c.visualizationAnim != nil {
 		c.visualizationAnim.Stop()
 		c.visualizationAnim = nil
-		c.App.LocalPlayer.SetPeaksEnabled(false)
+		//	c.App.LocalPlayer.SetPeaksEnabled(false)
 	}
 }
 
 func (c *Controller) startVisualizationAnim() {
 	if c.visualizationAnim == nil {
-		c.App.LocalPlayer.SetPeaksEnabled(true)
+		//c.App.LocalPlayer.SetPeaksEnabled(true)
 		c.visualizationAnim = fyne.NewAnimation(
 			time.Duration(math.MaxInt64), /*until stopped*/
 			c.tickVisualizations)
@@ -86,8 +89,8 @@ func (c *Controller) startVisualizationAnim() {
 }
 
 func (c *Controller) tickVisualizations(_ float32) {
-	lP, rP, lRMS, rRMS := c.App.LocalPlayer.GetPeaks()
+	//lP, rP, lRMS, rRMS := c.App.LocalPlayer.GetPeaks()
 	if c.visualizationData.peakMeter != nil {
-		c.visualizationData.peakMeter.UpdatePeaks(lP, rP, lRMS, rRMS)
+		//c.visualizationData.peakMeter.UpdatePeaks(lP, rP, lRMS, rRMS)
 	}
 }

ui/theme/theme.go

@@ -39,6 +39,7 @@ var (
 	AlbumIcon       fyne.Resource = theme.NewThemedResource(res.ResDiscSvg)
 	ArtistIcon      fyne.Resource = theme.NewThemedResource(res.ResPeopleSvg)
 	AutoplayIcon    fyne.Resource = theme.NewThemedResource(res.ResInfinitySvg)
+	CastIcon        fyne.Resource = theme.NewThemedResource(res.ResCastSvg)
 	RadioIcon       fyne.Resource = theme.NewThemedResource(res.ResBroadcastSvg)
 	FavoriteIcon    fyne.Resource = theme.NewThemedResource(res.ResHeartFilledSvg)
 	NotFavoriteIcon fyne.Resource = theme.NewThemedResource(res.ResHeartOutlineSvg)

ui/widgets/auxcontrols.go

@@ -2,6 +2,7 @@ package widgets
 
 import (
 	"math"
+	"time"
 
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/container"
@@ -25,6 +26,7 @@ type AuxControls struct {
 	VolumeControl *VolumeControl
 	autoplay      *IconButton
 	loop          *IconButton
+	cast          *IconButton
 	showQueue     *IconButton
 
 	container *fyne.Container
@@ -35,10 +37,17 @@ func NewAuxControls(initialVolume int, initialLoopMode backend.LoopMode, initial
 		VolumeControl: NewVolumeControl(initialVolume),
 		autoplay:      NewIconButton(myTheme.AutoplayIcon, nil),
 		loop:          NewIconButton(myTheme.RepeatIcon, nil),
+		cast:          NewIconButton(myTheme.CastIcon, nil),
 		showQueue:     NewIconButton(myTheme.PlayQueueIcon, nil),
 	}
+
 	a.loop.IconSize = IconButtonSizeSmaller
 	a.loop.SetToolTip(lang.L("Repeat"))
+	a.SetLoopMode(initialLoopMode)
+
+	a.cast.IconSize = IconButtonSizeSmaller
+	a.cast.SetToolTip(lang.L("Cast to device"))
+
 	a.autoplay.Highlighted = initialAutoplay
 	//a.autoplay.IconSize = IconButtonSizeSmaller
 	a.autoplay.SetToolTip(lang.L("Autoplay"))
@@ -48,9 +57,10 @@ func NewAuxControls(initialVolume int, initialLoopMode backend.LoopMode, initial
 			a.OnChangeAutoplay(a.autoplay.Highlighted)
 		}
 	}
-	a.SetLoopMode(initialLoopMode)
+
 	a.showQueue.IconSize = IconButtonSizeSmaller
 	a.showQueue.SetToolTip(lang.L("Show play queue"))
+
 	a.container = container.NewHBox(
 		layout.NewSpacer(),
 		container.NewVBox(
@@ -58,7 +68,7 @@ func NewAuxControls(initialVolume int, initialLoopMode backend.LoopMode, initial
 			a.VolumeControl,
 			container.New(
 				layout.NewCustomPaddedHBoxLayout(theme.Padding()*1.5),
-				layout.NewSpacer(), a.autoplay, a.loop, a.showQueue, util.NewHSpace(5)),
+				layout.NewSpacer(), a.autoplay, a.loop, a.cast, a.showQueue, util.NewHSpace(5)),
 			layout.NewSpacer(),
 		),
 	)
@@ -88,6 +98,16 @@ func (a *AuxControls) SetLoopMode(mode backend.LoopMode) {
 	}
 }
 
+func (a *AuxControls) DisableCastButton() {
+	a.cast.Disable()
+}
+
+func (a *AuxControls) SetIsRemotePlayer(isRemote bool) {
+	a.cast.Enable()
+	a.cast.Highlighted = isRemote
+	a.cast.Refresh()
+}
+
 func (a *AuxControls) SetAutoplay(autoplay bool) {
 	if autoplay == a.autoplay.Highlighted {
 		return
@@ -100,6 +120,12 @@ func (a *AuxControls) OnShowPlayQueue(f func()) {
 	a.showQueue.OnTapped = f
 }
 
+func (a *AuxControls) OnShowCastMenu(f func(func())) {
+	a.cast.OnTapped = func() {
+		f(a.DisableCastButton)
+	}
+}
+
 type volumeSlider struct {
 	widget.Slider
 
@@ -145,6 +171,10 @@ type VolumeControl struct {
 	muted   bool
 	lastVol int
 
+	setVolDebouncer func()
+	delaySetVolume  bool
+	pendingVolume   int
+
 	container *fyne.Container
 }
 
@@ -160,6 +190,15 @@ func NewVolumeControl(initialVol int) *VolumeControl {
 	v.slider.Orientation = widget.Horizontal
 	v.slider.Value = float64(v.lastVol)
 	v.slider.OnChanged = v.onChanged
+
+	// for players that are slow to respond to volume changes
+	// (e.g. DLNA), delay responding to the SetVolume call
+	// to avoid hiccuping from callback "echoes"
+	v.setVolDebouncer = util.NewDebouncer(100*time.Millisecond, func() {
+		v.delaySetVolume = false
+		v.SetVolume(v.pendingVolume)
+	})
+
 	v.container = container.NewHBox(container.NewCenter(v.icon), v.slider)
 	return v
 }
@@ -167,6 +206,11 @@ func NewVolumeControl(initialVol int) *VolumeControl {
 // Sets the volume that is displayed in the slider.
 // Does not invoke OnSetVolume callback.
 func (v *VolumeControl) SetVolume(vol int) {
+	if v.delaySetVolume {
+		v.pendingVolume = vol
+		return
+	}
+
 	if (vol == v.lastVol && !v.muted) || (v.muted && vol == 0) {
 		return
 	}
@@ -177,6 +221,8 @@ func (v *VolumeControl) SetVolume(vol int) {
 
 func (v *VolumeControl) onChanged(volume float64) {
 	vol := int(volume)
+	v.delaySetVolume = true
+	v.setVolDebouncer()
 	v.lastVol = vol
 	v.muted = false
 	v.updateIconForVolume(vol)