Extract and display radio ICY metadata (#845)

* extract and display radio ICY metadata

* fix crash when casting radio station

ui/bottompanel.go

@@ -35,6 +35,7 @@ func NewBottomPanel(pm *backend.PlaybackManager, im *backend.ImageManager, contr
 	bp.ExtendBaseWidget(bp)
 
 	pm.OnSongChange(bp.onSongChange)
+	pm.OnRadioMetadataChange(bp.onRadioMetadataChange)
 	pm.OnWaveformImgUpdate(bp.updateWaveformImg)
 	pm.OnPlayTimeUpdate(func(cur, total float64, _ bool) {
 		fyne.Do(func() {
@@ -143,6 +144,16 @@ func (bp *BottomPanel) onSongChange(song mediaprovider.MediaItem, _ *mediaprovid
 	})
 }
 
+func (bp *BottomPanel) onRadioMetadataChange(radioName, title, artist string) {
+	fyne.Do(func() {
+		bp.NowPlaying.Update(&mediaprovider.Track{
+			Title:       title,
+			ArtistNames: []string{artist},
+			Album:       radioName,
+		})
+	})
+}
+
 func (bp *BottomPanel) updateWaveformImg(img *backend.WaveformImage) {
 	fyne.Do(func() {
 		bp.Controls.UpdateWaveformImg(img)

ui/mainwindow.go

@@ -109,6 +109,15 @@ func NewMainWindow(fyneApp fyne.App, appName, displayAppName, appVersion string,
 	app.PlaybackManager.OnSongChange(func(item mediaprovider.MediaItem, _ *mediaprovider.Track) {
 		fyne.Do(func() { m.UpdateOnTrackChange(item) })
 	})
+	app.PlaybackManager.OnRadioMetadataChange(func(radioName, title, artist string) {
+		fyne.Do(func() {
+			if title != "" {
+				m.Window.SetTitle(fmt.Sprintf("%s – %s · %s", title, artist, res.DisplayName))
+			} else {
+				m.Window.SetTitle(fmt.Sprintf("%s · %s", radioName, res.DisplayName))
+			}
+		})
+	})
 	app.PlaybackManager.OnQueueChange(func() {
 		fyne.Do(func() { m.Sidebar.SetQueueTracks(app.PlaybackManager.GetPlayQueue()) })
 	})