line endings switch, and add missed stubs / go.mod update

backend/smtc_unsupported.go

@@ -5,11 +5,19 @@ package backend
 import "errors"
 
 type SMTCPlaybackState int
+type SMTCButton int
 
 const (
-	SMTCPlaybackStateStopped SMTCPlaybackState = 0
-	SMTCPlaybackStatePlaying SMTCPlaybackState = 1
-	SMTCPlaybackStatePaused  SMTCPlaybackState = 2
+	// constants from smtc.h in github.com/supersonic-app/smtc-dll
+	SMTCPlaybackStateStopped SMTCPlaybackState = 2
+	SMTCPlaybackStatePlaying SMTCPlaybackState = 3
+	SMTCPlaybackStatePaused  SMTCPlaybackState = 4
+
+	SMTCButtonPlay     SMTCButton = 0
+	SMTCButtonPause    SMTCButton = 1
+	SMTCButtonStop     SMTCButton = 2
+	SMTCButtonPrevious SMTCButton = 4
+	SMTCButtonNext     SMTCButton = 5
 )
 
 type SMTC struct{}
@@ -20,6 +28,12 @@ func InitSMTCForWindow(hwnd uintptr) (*SMTC, error) {
 	return nil, smtcUnsupportedErr
 }
 
+func (s *SMTC) OnButtonPressed(func(SMTCButton)) {}
+
+func (s *SMTC) OnSeek(f func(millis int)) {}
+
+func (s *SMTC) Shutdown() {}
+
 func (s *SMTC) UpdatePlaybackState(state SMTCPlaybackState) error {
 	return smtcUnsupportedErr
 }
@@ -28,5 +42,6 @@ func (s *SMTC) UpdateMetadata(title, artist string) error {
 	return smtcUnsupportedErr
 }
 
-func (s *SMTC) Shutdown() {
+func (s *SMTC) UpdatePosition(positionMillis, durationMillis int) error {
+	return smtcUnsupportedErr
 }

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/supersonic-app/go-subsonic v0.0.0-20241224013245-9b2841f3711d
 	github.com/zalando/go-keyring v0.2.1
 	golang.org/x/net v0.25.0
+	golang.org/x/sys v0.20.0
 	golang.org/x/text v0.16.0
 )
 
@@ -50,7 +51,6 @@ require (
 	github.com/yuin/goldmark v1.7.1 // indirect
 	golang.org/x/image v0.18.0 // indirect
 	golang.org/x/mobile v0.0.0-20231127183840-76ac6878050a // indirect
-	golang.org/x/sys v0.20.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )