move player package into backend

backend/player/player.go

@@ -0,0 +1,84 @@
+package player
+
+import "github.com/dweymouth/supersonic/backend/mediaprovider"
+
+type URLPlayer interface {
+	BasePlayer
+	PlayFile(url string) error
+	SetNextFile(url string) error
+}
+
+type TrackPlayer interface {
+	BasePlayer
+	PlayTrack(track *mediaprovider.Track) error
+	SetNextTrack(track *mediaprovider.Track) error
+}
+
+type BasePlayer interface {
+	Continue() error
+	Pause() error
+	Stop() error
+
+	SeekSeconds(secs float64) error
+	IsSeeking() bool
+
+	SetVolume(int) error
+	GetVolume() int
+
+	GetStatus() Status
+
+	// Event API
+	OnPaused(func())
+	OnStopped(func())
+	OnPlaying(func())
+	OnSeek(func())
+	OnTrackChange(func())
+}
+
+type ReplayGainPlayer interface {
+	SetReplayGainOptions(ReplayGainOptions) error
+}
+
+// The playback state (Stopped, Paused, or Playing).
+type State int
+
+const (
+	Stopped State = iota
+	Paused
+	Playing
+)
+
+// The current status of the player.
+// Includes playback state, current time, total track time, and playlist position.
+type Status struct {
+	State    State
+	TimePos  float64
+	Duration float64
+}
+
+type ReplayGainMode int
+
+const (
+	ReplayGainNone ReplayGainMode = iota
+	ReplayGainTrack
+	ReplayGainAlbum
+)
+
+// Replay Gain options (argument to SetReplayGainOptions).
+type ReplayGainOptions struct {
+	Mode            ReplayGainMode
+	PreampGain      float64
+	PreventClipping bool
+	// Fallback gain intentionally omitted
+}
+
+func (r ReplayGainMode) String() string {
+	switch r {
+	case ReplayGainTrack:
+		return "track"
+	case ReplayGainAlbum:
+		return "album"
+	default:
+		return "no"
+	}
+}