Jukebox cleanup (#2554)

* Fixing typo FFmpegPath -> MPVPath

* Fixing panic by applying afontenot patch

* Using mpv audio-device flag and naming for config and playback

core/playback/device.go

@@ -24,7 +24,6 @@ type PlaybackDevice struct {
 	Default              bool
 	User                 string
 	Name                 string
-	Method               string
 	DeviceName           string
 	PlaybackQueue        *Queue
 	Gain                 float32
@@ -60,12 +59,11 @@ func (pd *PlaybackDevice) getStatus() DeviceStatus {
 // NewPlaybackDevice creates a new playback device which implements all the basic Jukebox mode commands defined here:
 // http://www.subsonic.org/pages/api.jsp#jukeboxControl
 // Starts the trackSwitcher goroutine for the device.
-func NewPlaybackDevice(playbackServer PlaybackServer, name string, method string, deviceName string) *PlaybackDevice {
+func NewPlaybackDevice(playbackServer PlaybackServer, name string, deviceName string) *PlaybackDevice {
 	return &PlaybackDevice{
 		ParentPlaybackServer: playbackServer,
 		User:                 "",
 		Name:                 name,
-		Method:               method,
 		DeviceName:           deviceName,
 		Gain:                 DefaultGain,
 		PlaybackQueue:        NewQueue(),
@@ -146,12 +144,12 @@ func (pd *PlaybackDevice) Skip(ctx context.Context, index int, offset int) (Devi
 		pd.ActiveTrack.Pause()
 	}
 
-	if index != pd.PlaybackQueue.Index {
-		if pd.ActiveTrack != nil {
-			pd.ActiveTrack.Close()
-			pd.ActiveTrack = nil
-		}
+	if index != pd.PlaybackQueue.Index && pd.ActiveTrack != nil {
+		pd.ActiveTrack.Close()
+		pd.ActiveTrack = nil
+	}
 
+	if pd.ActiveTrack == nil {
 		err := pd.switchActiveTrackByIndex(index)
 		if err != nil {
 			return pd.getStatus(), err
@@ -278,7 +276,7 @@ func (pd *PlaybackDevice) switchActiveTrackByIndex(index int) error {
 		return fmt.Errorf("could not get current track")
 	}
 
-	track, err := mpv.NewTrack(pd.PlaybackDone, *currentTrack)
+	track, err := mpv.NewTrack(pd.PlaybackDone, pd.DeviceName, *currentTrack)
 	if err != nil {
 		return err
 	}

core/playback/mpv/mpv.go

@@ -19,7 +19,7 @@ import (
 
 // mpv --no-audio-display --pause 'Jack Johnson/On And On/01 Times Like These.m4a' --input-ipc-server=/tmp/gonzo.socket
 const (
-	mpvComdTemplate = "mpv --no-audio-display --pause %f --input-ipc-server=%s"
+	mpvComdTemplate = "mpv --audio-device=%d --no-audio-display --pause %f --input-ipc-server=%s"
 )
 
 func start(args []string) (Executor, error) {
@@ -81,9 +81,10 @@ func (j *Executor) wait() {
 }
 
 // Path will always be an absolute path
-func createMPVCommand(cmd, filename string, socketName string) []string {
+func createMPVCommand(cmd, deviceName string, filename string, socketName string) []string {
 	split := strings.Split(fixCmd(cmd), " ")
 	for i, s := range split {
+		s = strings.ReplaceAll(s, "%d", deviceName)
 		s = strings.ReplaceAll(s, "%f", filename)
 		s = strings.ReplaceAll(s, "%s", socketName)
 		split[i] = s
@@ -110,7 +111,7 @@ func fixCmd(cmd string) string {
 func mpvCommand() (string, error) {
 	mpvOnce.Do(func() {
 		if conf.Server.MPVPath != "" {
-			mpvPath = conf.Server.FFmpegPath
+			mpvPath = conf.Server.MPVPath
 			mpvPath, mpvErr = exec.LookPath(mpvPath)
 		} else {
 			mpvPath, mpvErr = exec.LookPath("mpv")

core/playback/mpv/track.go

@@ -24,7 +24,7 @@ type MpvTrack struct {
 	CloseCalled   bool
 }
 
-func NewTrack(playbackDoneChannel chan bool, mf model.MediaFile) (*MpvTrack, error) {
+func NewTrack(playbackDoneChannel chan bool, deviceName string, mf model.MediaFile) (*MpvTrack, error) {
 	log.Debug("loading track", "trackname", mf.Path, "mediatype", mf.ContentType())
 
 	if _, err := mpvCommand(); err != nil {
@@ -33,7 +33,7 @@ func NewTrack(playbackDoneChannel chan bool, mf model.MediaFile) (*MpvTrack, err
 
 	tmpSocketName := TempFileName("mpv-ctrl-", ".socket")
 
-	args := createMPVCommand(mpvComdTemplate, mf.Path, tmpSocketName)
+	args := createMPVCommand(mpvComdTemplate, deviceName, mf.Path, tmpSocketName)
 	exe, err := start(args)
 	if err != nil {
 		log.Error("error starting mpv process", "error", err)

core/playback/playbackserver.go

@@ -46,8 +46,11 @@ func (ps *playbackServer) Run(ctx context.Context) error {
 	if err != nil {
 		return err
 	}
-	log.Info(ctx, fmt.Sprintf("%d audio devices found", len(conf.Server.Jukebox.Devices)))
-	log.Info(ctx, "Using default audio device: "+conf.Server.Jukebox.Default)
+	log.Info(ctx, fmt.Sprintf("%d audio devices found", len(devices)))
+
+	defaultDevice, _ := ps.getDefaultDevice()
+
+	log.Info(ctx, "Using audio device: "+defaultDevice.DeviceName)
 
 	ps.ctx = &ctx
 
@@ -61,15 +64,37 @@ func (ps *playbackServer) GetCtx() *context.Context {
 }
 
 func (ps *playbackServer) initDeviceStatus(devices []conf.AudioDeviceDefinition, defaultDevice string) ([]PlaybackDevice, error) {
-	pbDevices := make([]PlaybackDevice, len(devices))
+	pbDevices := make([]PlaybackDevice, max(1, len(devices)))
 	defaultDeviceFound := false
 
-	for idx, audioDevice := range devices {
-		if len(audioDevice) != 3 {
-			return []PlaybackDevice{}, fmt.Errorf("audio device definition ought to contain 3 fields, found: %d ", len(audioDevice))
+	if defaultDevice == "" {
+		// if there are no devices given and no default device, we create a sythetic device named "auto"
+		if len(devices) == 0 {
+			pbDevices[0] = *NewPlaybackDevice(ps, "auto", "auto")
 		}
 
-		pbDevices[idx] = *NewPlaybackDevice(ps, audioDevice[0], audioDevice[1], audioDevice[2])
+		// if there is but only one entry and no default given, just use that.
+		if len(devices) == 1 {
+			if len(devices[0]) != 2 {
+				return []PlaybackDevice{}, fmt.Errorf("audio device definition ought to contain 2 fields, found: %d ", len(devices[0]))
+			}
+			pbDevices[0] = *NewPlaybackDevice(ps, devices[0][0], devices[0][1])
+		}
+
+		if len(devices) > 1 {
+			return []PlaybackDevice{}, fmt.Errorf("number of audio device found is %d, but no default device defined. Set Jukebox.Default", len(devices))
+		}
+
+		pbDevices[0].Default = true
+		return pbDevices, nil
+	}
+
+	for idx, audioDevice := range devices {
+		if len(audioDevice) != 2 {
+			return []PlaybackDevice{}, fmt.Errorf("audio device definition ought to contain 2 fields, found: %d ", len(audioDevice))
+		}
+
+		pbDevices[idx] = *NewPlaybackDevice(ps, audioDevice[0], audioDevice[1])
 
 		if audioDevice[0] == defaultDevice {
 			pbDevices[idx].Default = true