1 files changed, 39 insertions, 4 deletions

diff --git a/src/rhlibrary/player_widget.go b/src/rhlibrary/player_widget.go
index 7581b45..7da5a44 100644
--- a/src/rhlibrary/player_widget.go
+++ b/src/rhlibrary/player_widget.go
@@ -25,10 +25,18 @@
 package main
 
 import (
+	"time"
+
 	"code.helsinki.at/rhrd-go/player"
+	"github.com/gotk3/gotk3/glib"
 	"github.com/gotk3/gotk3/gtk"
 )
 
+const (
+	meterDBFloor  float64 = 72 // -72 db is the lowest VU value
+	meterSegments float64 = 30 // meter has 30 elements
+)
+
 func addPlayButton(grid *gtk.Grid, p *player.PlayerChan) (err error) {
 	var btn *gtk.Button
 	if btn, err = gtk.ButtonNewFromIconName("media-playback-start", gtk.ICON_SIZE_DIALOG); err != nil {
@@ -71,6 +79,16 @@ func addStopButton(grid *gtk.Grid, p *player.PlayerChan) (err error) {
 	return
 }
 
+func calcMeterLevel(valdb float64) (val float64) {
+	val = valdb + meterDBFloor
+	if val < 0 {
+		val = 0
+	} else {
+		val = (val / meterDBFloor) * meterSegments
+	}
+	return
+}
+
 func addMeter(grid *gtk.Grid, p *player.PlayerChan) (err error) {
 	var mgrid *gtk.Grid
 	if mgrid, err = gtk.GridNew(); err != nil {
@@ -80,16 +98,33 @@ func addMeter(grid *gtk.Grid, p *player.PlayerChan) (err error) {
 	mgrid.SetColumnSpacing(3)
 
 	var left, right *gtk.LevelBar
-	if left, err = gtk.LevelBarNewForInterval(0, 30); err != nil {
+	if left, err = gtk.LevelBarNewForInterval(0, meterSegments); err != nil {
 		return
 	}
-	if right, err = gtk.LevelBarNewForInterval(0, 30); err != nil {
+	if right, err = gtk.LevelBarNewForInterval(0, meterSegments); err != nil {
 		return
 	}
 	left.SetMode(gtk.LEVEL_BAR_MODE_DISCRETE)
 	right.SetMode(gtk.LEVEL_BAR_MODE_DISCRETE)
-	left.SetValue(8)
-	right.SetValue(17)
+
+	p.AddUpdateHandler(func(length time.Duration, pos time.Duration, meter player.Meter, userdata interface{}) bool {
+		glib.IdleAdd(func() {
+			ch := len(meter)
+			lval := float64(0)
+			rval := float64(0)
+			if ch >= 2 {
+				lval = calcMeterLevel(meter[0].Peak)
+				rval = calcMeterLevel(meter[1].Peak)
+			} else if ch == 1 {
+				lval = calcMeterLevel(meter[0].Peak)
+				rval = lval
+			}
+			left.SetValue(lval)
+			right.SetValue(rval)
+		})
+		return true
+	}, nil)
+
 	mgrid.Add(left)
 	mgrid.Add(right)