codec

type ID string

type Reader func() (io.ReadCloser, int64, error)

type Song interface {
	// Info returns information about a song.
	Info() (SongInfo, error)
	// Init is called before the first call to Play(). It should prepare resources
	// needed for Play().
	Init() (sampleRate, channels int, err error)
	// Play returns the next n samples. Return < n to indicate end of song or 0
	// to indicate EOF, neither of which should return an error. If < n samples
	// are returned, Play will not be invoked again.
	Play(n int) ([]float32, error)
	// Close releases resources used by the current file.
	Close()
}

type SongInfo struct {
	Time     time.Duration
	Artist   string
	Title    string
	Album    string
	Track    float64
	ImageURL string `json:",omitempty"`
}

type Songs map[ID]Song