more playback commands

backend/playbackcommands.go

@@ -3,24 +3,36 @@ package backend
 import (
 	"slices"
 	"sync"
+
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
 )
 
-type PlaybackCommandType int
+type playbackCommandType int
 
 const (
-	CmdStop PlaybackCommandType = iota
-	CmdContinue
-	CmdPause
-	CmdPlayTrackAt
-	CmdSeekSeconds
-	CmdSeekFwdBackN
-	CmdVolume
-	CmdLoopMode
+	cmdStop playbackCommandType = iota
+	cmdContinue
+	cmdPause
+	cmdPlayTrackAt  // arg: int
+	cmdSeekSeconds  // arg: float64
+	cmdSeekFwdBackN // arg: int
+	cmdVolume       // arg: int
+	cmdLoopMode     // arg: LoopMode
+	cmdStopAndClearPlayQueue
+	cmdUpdatePlayQueue       // arg: []mediaprovider.MediaItem
+	cmdRemoveTracksFromQueue // arg: []int
+	// arg: []mediaprovider.MediaItem
+	// arg2: InsertMode
+	// arg3: bool (shuffle)
+	cmdLoadItems
+	cmdLoadRadioStation // arg: *mediaprovider.RadioStation, arg2: InsertQueueMode
 )
 
 type PlaybackCommand struct {
-	Type PlaybackCommandType
+	Type playbackCommandType
 	Arg  any
+	Arg2 any
+	Arg3 any
 }
 
 type CommandQueue struct {
@@ -42,36 +54,84 @@ func (c *CommandQueue) C() <-chan PlaybackCommand {
 }
 
 func (c *CommandQueue) Stop() {
-	c.filterCommandsAndAdd([]PlaybackCommandType{CmdContinue, CmdPause, CmdStop},
-		PlaybackCommand{Type: CmdStop})
+	c.filterCommandsAndAdd([]playbackCommandType{cmdContinue, cmdPause, cmdStop},
+		PlaybackCommand{Type: cmdStop})
 }
 
 func (c *CommandQueue) Continue() {
-	c.filterCommandsAndAdd([]PlaybackCommandType{CmdContinue, CmdPause, CmdStop},
-		PlaybackCommand{Type: CmdContinue})
+	c.filterCommandsAndAdd([]playbackCommandType{cmdContinue, cmdPause, cmdStop},
+		PlaybackCommand{Type: cmdContinue})
 }
 
 func (c *CommandQueue) Pause() {
-	c.filterCommandsAndAdd([]PlaybackCommandType{CmdContinue, CmdPause, CmdStop},
-		PlaybackCommand{Type: CmdPause})
+	c.filterCommandsAndAdd([]playbackCommandType{cmdContinue, cmdPause, cmdStop},
+		PlaybackCommand{Type: cmdPause})
 }
 
-func (c *CommandQueue) Volume(vol int) {
-	c.filterCommandsAndAdd([]PlaybackCommandType{CmdVolume},
-		PlaybackCommand{Type: CmdVolume, Arg: vol})
+func (c *CommandQueue) StopAndClearPlayQueue() {
+	c.filterCommandsAndAdd([]playbackCommandType{cmdContinue, cmdPause, cmdStop, cmdStopAndClearPlayQueue},
+		PlaybackCommand{Type: cmdStopAndClearPlayQueue})
 }
 
-func (c *CommandQueue) LoopMode(mode LoopMode) {
-	c.filterCommandsAndAdd([]PlaybackCommandType{CmdLoopMode},
-		PlaybackCommand{Type: CmdLoopMode, Arg: mode})
+func (c *CommandQueue) SetVolume(vol int) {
+	c.filterCommandsAndAdd([]playbackCommandType{cmdVolume},
+		PlaybackCommand{Type: cmdVolume, Arg: vol})
+}
+
+func (c *CommandQueue) SetLoopMode(mode LoopMode) {
+	c.filterCommandsAndAdd([]playbackCommandType{cmdLoopMode},
+		PlaybackCommand{Type: cmdLoopMode, Arg: mode})
 }
 
 func (c *CommandQueue) SeekSeconds(s float64) {
-	c.filterCommandsAndAdd([]PlaybackCommandType{CmdVolume},
-		PlaybackCommand{Type: CmdSeekSeconds, Arg: s})
+	c.filterCommandsAndAdd([]playbackCommandType{cmdSeekSeconds},
+		PlaybackCommand{Type: cmdSeekSeconds, Arg: s})
 }
 
-func (c *CommandQueue) filterCommandsAndAdd(excludeTypes []PlaybackCommandType, command PlaybackCommand) {
+func (c *CommandQueue) SeekNext() {
+	c.seekBackOrFwd(1)
+}
+
+func (c *CommandQueue) SeekBackOrPrevious() {
+	c.seekBackOrFwd(-1)
+}
+
+func (c *CommandQueue) UpdatePlayQueue(items []mediaprovider.MediaItem) {
+	c.filterCommandsAndAdd([]playbackCommandType{cmdUpdatePlayQueue},
+		PlaybackCommand{Type: cmdUpdatePlayQueue, Arg: items})
+}
+
+func (c *CommandQueue) RemoveItemsFromQueue(idxs []int) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	c.queue = append(c.queue, PlaybackCommand{
+		Type: cmdRemoveTracksFromQueue,
+		Arg:  idxs,
+	})
+}
+
+func (c *CommandQueue) LoadRadioStation(radio *mediaprovider.RadioStation, insertMode InsertQueueMode) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	c.queue = append(c.queue, PlaybackCommand{
+		Type: cmdLoadRadioStation,
+		Arg:  radio,
+		Arg2: insertMode,
+	})
+}
+
+func (c *CommandQueue) LoadItems(items []mediaprovider.MediaItem, insertQueueMode InsertQueueMode, shuffle bool) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	c.queue = append(c.queue, PlaybackCommand{
+		Type: cmdLoadItems,
+		Arg:  items,
+		Arg2: insertQueueMode,
+		Arg3: shuffle,
+	})
+}
+
+func (c *CommandQueue) filterCommandsAndAdd(excludeTypes []playbackCommandType, command PlaybackCommand) {
 	c.mutex.Lock()
 	defer c.mutex.Unlock()
 
@@ -87,6 +147,26 @@ func (c *CommandQueue) filterCommandsAndAdd(excludeTypes []PlaybackCommandType,
 	c.queue = append(c.queue, command)
 }
 
+func (c *CommandQueue) seekBackOrFwd(direction int) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	j := 0
+	n := 0
+	for _, cmd := range c.queue {
+		if cmd.Type == cmdSeekFwdBackN {
+			n += cmd.Arg.(int)
+		} else {
+			c.queue[j] = cmd
+			j++
+		}
+	}
+	c.queue = c.queue[:j]
+	c.queue = append(c.queue, PlaybackCommand{
+		Type: cmdSeekFwdBackN,
+		Arg:  n + direction})
+}
+
 func (c *CommandQueue) chanWriter() {
 	for {
 		c.mutex.Lock()

backend/playbackengine.go

@@ -213,14 +213,14 @@ func (p *playbackEngine) Continue() error {
 // Load items into the play queue.
 // If replacing the current queue (!appendToQueue), playback will be stopped.
 func (p *playbackEngine) LoadItems(items []mediaprovider.MediaItem, insertQueueMode InsertQueueMode, shuffle bool) error {
-	newItems := p.deepCopyMediaItemSlice(items)
+	newItems := deepCopyMediaItemSlice(items)
 	return p.doLoaditems(newItems, insertQueueMode, shuffle)
 }
 
 // Load tracks into the play queue.
 // If replacing the current queue (!appendToQueue), playback will be stopped.
 func (p *playbackEngine) LoadTracks(tracks []*mediaprovider.Track, insertQueueMode InsertQueueMode, shuffle bool) error {
-	newTracks := p.copyTrackSliceToMediaItemSlice(tracks)
+	newTracks := copyTrackSliceToMediaItemSlice(tracks)
 	return p.doLoaditems(newTracks, insertQueueMode, shuffle)
 }
 
@@ -288,7 +288,7 @@ func (p *playbackEngine) StopAndClearPlayQueue() {
 }
 
 func (p *playbackEngine) GetPlayQueue() []mediaprovider.MediaItem {
-	return p.deepCopyMediaItemSlice(p.playQueue)
+	return deepCopyMediaItemSlice(p.playQueue)
 }
 
 // Any time the user changes the favorite status of a track elsewhere in the app,
@@ -315,7 +315,7 @@ func (p *playbackEngine) OnTrackRatingChanged(id string, rating int) {
 // Does not stop playback if the currently playing track is in the new queue,
 // but updates the now playing index to point to the first instance of the track in the new queue.
 func (p *playbackEngine) UpdatePlayQueue(items []mediaprovider.MediaItem) error {
-	newQueue := p.deepCopyMediaItemSlice(items)
+	newQueue := deepCopyMediaItemSlice(items)
 	newNowPlayingIdx := -1
 	if p.nowPlayingIdx >= 0 {
 		nowPlayingID := p.playQueue[p.nowPlayingIdx].Metadata().ID
@@ -591,7 +591,7 @@ func (p *playbackEngine) sendNowPlayingScrobble() {
 
 // creates a deep copy of the track info so that we can maintain our own state
 // (play count increases, favorite, and rating) without messing up other views' track models
-func (p *playbackEngine) deepCopyMediaItemSlice(tracks []mediaprovider.MediaItem) []mediaprovider.MediaItem {
+func deepCopyMediaItemSlice(tracks []mediaprovider.MediaItem) []mediaprovider.MediaItem {
 	newTracks := make([]mediaprovider.MediaItem, len(tracks))
 	for i, tr := range tracks {
 		newTracks[i] = tr.Copy()
@@ -599,7 +599,7 @@ func (p *playbackEngine) deepCopyMediaItemSlice(tracks []mediaprovider.MediaItem
 	return newTracks
 }
 
-func (p *playbackEngine) copyTrackSliceToMediaItemSlice(tracks []*mediaprovider.Track) []mediaprovider.MediaItem {
+func copyTrackSliceToMediaItemSlice(tracks []*mediaprovider.Track) []mediaprovider.MediaItem {
 	newTracks := make([]mediaprovider.MediaItem, len(tracks))
 	for i, tr := range tracks {
 		newTracks[i] = tr.Copy()