more jukebox work

backend/mediaprovider/mediaprovider.go

@@ -298,11 +298,16 @@ type JukeboxProvider interface {
 	JukeboxStop() error
 	JukeboxSeek(idx, seconds int) error
 	JukeboxClear() error
-	JukeboxSet(trackID string) error
 	JukeboxAdd(trackID string) error
 	JukeboxRemove(idx int) error
-	JukeboxSetVolume(vol int) error
 	JukeboxGetStatus() (*JukeboxStatus, error)
+
+	// Performs a Clear followed by an Add to set the queue
+	// to contain a single track
+	JukeboxSet(trackID string) error
+
+	// Sets the volume of the jukebox player (0-100)
+	JukeboxSetVolume(vol int) error
 }
 
 type JukeboxStatus struct {

backend/mediaprovider/subsonic/jukebox.go

@@ -1,6 +1,7 @@
 package subsonic
 
 import (
+	"fmt"
 	"strconv"
 
 	"github.com/dweymouth/supersonic/backend/mediaprovider"
@@ -24,8 +25,9 @@ func (s *subsonicMediaProvider) JukeboxClear() error {
 }
 
 func (s *subsonicMediaProvider) JukeboxSetVolume(vol int) error {
+	v := float64(vol) / 100
 	_, err := s.client.JukeboxControl("setGain",
-		map[string]string{"gain": strconv.Itoa(vol)})
+		map[string]string{"gain": fmt.Sprintf("%0.2f", v)})
 	return err
 }