replace pactl based volume control with mpris based volume control

methods

pkg/player/pactl.go

@@ -1,16 +0,0 @@
-package player
-
-import (
-	"fmt"
-	"os/exec"
-)
-
-// VolUp uses pactl to increase the volume of the default sink
-func VolUp(percent uint) error {
-	return exec.Command("pactl", "set-sink-volume", "@DEFAULT_SINK@", fmt.Sprintf("+%d%%", percent)).Run()
-}
-
-// VolDown uses pactl to decrease the volume of the default sink
-func VolDown(percent uint) error {
-	return exec.Command("pactl", "set-sink-volume", "@DEFAULT_SINK@", fmt.Sprintf("-%d%%", percent)).Run()
-}

pkg/player/player.go

@@ -107,6 +107,46 @@ func Prev() error {
 	return nil
 }
 
+func VolUp(percent uint) error {
+
+	player, err := getPlayerObj()
+	if err != nil {
+		return err
+	}
+	if player != nil {
+                currentVal, err := player.GetProperty("org.mpris.MediaPlayer2.Player.Volume")
+                if err != nil {
+                    return err
+                }
+                newVal := currentVal.Value().(float64) + (float64(percent) / 100)
+                err = player.SetProperty("org.mpris.MediaPlayer2.Player.Volume", newVal)
+                if err != nil {
+                    return err
+                }
+        }
+	return nil
+}
+
+func VolDown(percent uint) error {
+
+	player, err := getPlayerObj()
+	if err != nil {
+		return err
+	}
+	if player != nil {
+                currentVal, err := player.GetProperty("org.mpris.MediaPlayer2.Player.Volume")
+                if err != nil {
+                    return err
+                }
+                newVal := currentVal.Value().(float64) - (float64(percent) / 100)
+                err = player.SetProperty("org.mpris.MediaPlayer2.Player.Volume", newVal)
+                if err != nil {
+                    return err
+                }
+        }
+	return nil
+}
+
 type ChangeType int
 
 const (