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package music
import (
"fmt"
"path/filepath"
"time"
"github.com/delucks/go-subsonic"
"github.com/faiface/beep"
"github.com/faiface/beep/flac"
"github.com/faiface/beep/mp3"
"github.com/faiface/beep/speaker"
"github.com/faiface/beep/vorbis"
)
type Queue struct {
songs []*subsonic.Child
isPaused bool
sub *subsonic.Client
speakerInitialized bool
oldSampleRate beep.SampleRate
onChange func(newSong *subsonic.Child, isPaused bool)
}
func NewQueue(client *subsonic.Client) *Queue {
return &Queue{
sub: client,
speakerInitialized: false,
}
}
func (q *Queue) SetClient(client *subsonic.Client) {
q.Clear()
q.sub = client
}
func (p *Queue) GetSongs() []*subsonic.Child {
return p.songs
}
func (q *Queue) Append(s *subsonic.Child) {
q.songs = append(q.songs, s)
}
func (q *Queue) Insert(i int, s *subsonic.Child) {
if len(q.songs) == 0 {
q.Append(s)
return
}
q.songs = append(q.songs[:i], append([]*subsonic.Child{s}, q.songs[i:]...)...)
}
func (q *Queue) Clear() {
q.songs = make([]*subsonic.Child, 0)
if q.isPaused {
q.TogglePause()
}
q.Stop()
q.triggerChange()
}
func (q *Queue) PlaySong(s *subsonic.Child) error {
if q.isPaused {
q.TogglePause()
}
rc, err := Download2(q.sub, s.ID)
if err != nil {
return err
}
var ssc beep.StreamSeekCloser
var format beep.Format
switch filepath.Ext(s.Path) {
case ".mp3":
ssc, format, err = mp3.Decode(rc)
case ".ogg":
fallthrough
case ".oga":
ssc, format, err = vorbis.Decode(rc)
case ".flac":
ssc, format, err = flac.Decode(rc)
default:
return fmt.Errorf("unknown file type: %s", filepath.Ext(s.Path))
}
if err != nil {
return err
}
streamer, err := q.setupSpeaker(ssc, format)
if err != nil {
return err
}
speaker.Clear()
speaker.Play(beep.Seq(streamer, beep.Callback(func() { go q.Next() })))
q.triggerChange()
return nil
}
func (q *Queue) Play() error {
if len(q.songs) == 0 {
return fmt.Errorf("the queue is empty")
}
s := q.songs[0]
q.PlaySong(s)
return nil
}
func (q *Queue) Next() error {
q.Stop()
if len(q.songs) == 0 {
return nil
}
q.songs = q.songs[1:]
if len(q.songs) == 0 {
if q.onChange != nil {
q.onChange(nil, false)
}
return nil
}
return q.Play()
}
func (q *Queue) Stop() {
if q.isPaused {
q.TogglePause()
}
speaker.Clear()
}
func (q *Queue) SetOnChangeCallback(f func(newSong *subsonic.Child, isPlaying bool)) {
q.onChange = f
}
func (q *Queue) TogglePause() {
if q.isPaused {
speaker.Unlock()
} else {
speaker.Lock()
}
q.isPaused = !q.isPaused
q.triggerChange()
}
func (q *Queue) SkipTo(s *subsonic.Child) {
i := -1
for n, s2 := range q.GetSongs() {
if s.ID == s2.ID {
i = n
break
}
}
if i == -1 {
return
}
q.songs = q.songs[i:]
q.Play()
}
func (q *Queue) RemoveSong(i int) error {
if i >= len(q.songs) {
return fmt.Errorf("index out of bounds")
}
q.songs = append(q.songs[:i], q.songs[i+1:]...)
if i == 0 {
// We removed the first song: this stops it and prepares for the next
q.Stop()
if !q.isPaused {
q.Play()
}
}
q.triggerChange()
return nil
}
func (q *Queue) Switch(a, b int) error {
if a >= len(q.songs) {
return fmt.Errorf("%d is out of bounds", a)
}
if b >= len(q.songs) {
return fmt.Errorf("%d is out of bounds", b)
}
tmp := q.songs[a]
q.songs[a] = q.songs[b]
q.songs[b] = tmp
if (a == 0 || b == 0) && !q.isPaused {
// If we're switching the first song, and it's currently playing, start Play() again
q.Play()
}
q.triggerChange()
return nil
}
func (q *Queue) triggerChange() {
if q.onChange != nil {
if len(q.songs) > 0 {
q.onChange(q.songs[0], q.isPaused)
}
}
}
func (p *Queue) setupSpeaker(s beep.Streamer, format beep.Format) (beep.Streamer, error) {
if !p.speakerInitialized {
err := speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10))
if err != nil {
return nil, fmt.Errorf("speaker.Init: %v", err)
}
p.speakerInitialized = true
p.oldSampleRate = format.SampleRate
return s, nil
} else {
sr := p.oldSampleRate
p.oldSampleRate = format.SampleRate
return beep.Resample(4, format.SampleRate, sr, s), nil
}
}
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