initial implementation of Windows SMTC integration

backend/app.go

@@ -12,6 +12,7 @@ import (
 	"reflect"
 	"runtime"
 	"slices"
+	"strings"
 	"time"
 
 	"github.com/dweymouth/supersonic/backend/ipc"
@@ -45,6 +46,7 @@ type App struct {
 	LocalPlayer     *mpv.Player
 	UpdateChecker   UpdateChecker
 	MPRISHandler    *MPRISHandler
+	WinSMTC         *SMTC
 	ipcServer       ipc.IPCServer
 
 	// UI callbacks to be set in main
@@ -165,11 +167,14 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 	}
 
 	// OS media center integrations
+	// Linux MPRIS
 	a.setupMPRIS(displayAppName)
+	// MacOS MPNowPlayingInfoCenter
 	InitMPMediaHandler(a.PlaybackManager, func(id string) (string, error) {
 		a.ImageManager.GetCoverThumbnail(id) // ensure image is cached locally
 		return a.ImageManager.GetCoverArtUrl(id)
 	})
+	// Windows SMTC is initialized from main once we have a window HWND.
 
 	a.startConfigWriter(a.bgrndCtx)
 
@@ -331,6 +336,50 @@ func (a *App) setupMPRIS(mprisAppName string) {
 	a.MPRISHandler.Start()
 }
 
+func (a *App) SetupWindowsSMTC(hwnd uintptr) {
+	smtc, err := InitSMTCForWindow(hwnd)
+	if err != nil {
+		log.Printf("error initializing SMTC: %d", err)
+		return
+	}
+	a.WinSMTC = smtc
+
+	smtc.OnButtonPressed(func(btn SMTCButton) {
+		switch btn {
+		case SMTCButtonPlay:
+			a.PlaybackManager.Continue()
+		case SMTCButtonPause:
+			a.PlaybackManager.Pause()
+		case SMTCButtonNext:
+			a.PlaybackManager.SeekNext()
+		case SMTCButtonPrevious:
+			a.PlaybackManager.SeekBackOrPrevious()
+		case SMTCButtonStop:
+			a.PlaybackManager.Stop()
+		}
+	})
+	smtc.OnSeek(func(millis int) {
+		a.PlaybackManager.SeekSeconds(float64(millis) / 1000)
+	})
+
+	a.PlaybackManager.OnSongChange(func(nowPlaying mediaprovider.MediaItem, _ *mediaprovider.Track) {
+		if nowPlaying == nil {
+			smtc.UpdateMetadata("", "")
+			return
+		}
+		artist := strings.Join(nowPlaying.Metadata().Artists, ", ")
+		smtc.UpdateMetadata(nowPlaying.Metadata().Name, artist)
+		smtc.UpdatePosition(0, nowPlaying.Metadata().Duration*1000)
+	})
+	a.PlaybackManager.OnSeek(func() {
+		dur := a.PlaybackManager.NowPlaying().Metadata().Duration
+		smtc.UpdatePosition(int(a.PlaybackManager.CurrentPlayer().GetStatus().TimePos*1000), dur*1000)
+	})
+	a.PlaybackManager.OnPlaying(func() { smtc.UpdatePlaybackState(SMTCPlaybackStatePlaying) })
+	a.PlaybackManager.OnPaused(func() { smtc.UpdatePlaybackState(SMTCPlaybackStatePaused) })
+	a.PlaybackManager.OnStopped(func() { smtc.UpdatePlaybackState(SMTCPlaybackStateStopped) })
+}
+
 func (a *App) LoginToDefaultServer(string) error {
 	serverCfg := a.ServerManager.GetDefaultServer()
 	if serverCfg == nil {
@@ -370,6 +419,9 @@ func (a *App) Shutdown() {
 		a.ipcServer.Shutdown(a.bgrndCtx)
 	}
 	a.MPRISHandler.Shutdown()
+	if a.WinSMTC != nil {
+		a.WinSMTC.Shutdown()
+	}
 	a.PlaybackManager.DisableCallbacks()
 	a.PlaybackManager.Stop() // will trigger scrobble check
 	a.cancel()