feature: provide HDMI status in /api/vm/hdmi (#859)

* feature: provide HDMI status in  /api/vm/hdmi

* fix: return false when HDMI idle in  /api/vm/hdmi

server/common/kvm_vision.go

@@ -116,6 +116,16 @@ func (k *KvmVision) SetHDMI(enable bool) int {
 	return result
 }
 
+func (k *KvmVision) HasHDMISignal() bool {
+	k.mutex.RLock()
+	defer k.mutex.RUnlock()
+	if k.closed {
+		return false
+	}
+
+	return C.kvmv_hdmi_signal_active() != 0
+}
+
 func (k *KvmVision) SetGop(gop uint8) {
 	k.mutex.RLock()
 	defer k.mutex.RUnlock()

server/go.mod

@@ -21,6 +21,7 @@ require (
 	github.com/spf13/viper v1.19.0
 	github.com/unrolled/secure v1.15.0
 	golang.org/x/crypto v0.45.0
+	golang.org/x/sys v0.41.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
@@ -79,7 +80,6 @@ require (
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
 	golang.org/x/net v0.47.0 // indirect
 	golang.org/x/oauth2 v0.35.0 // indirect
-	golang.org/x/sys v0.41.0 // indirect
 	golang.org/x/text v0.31.0 // indirect
 	google.golang.org/protobuf v1.34.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect

server/include/kvm_vision.h

@@ -66,6 +66,7 @@ void set_h264_gop(uint8_t _gop);
 void set_frame_detact(uint8_t _frame_detact);
 void kvmv_deinit();
 uint8_t kvmv_hdmi_control(uint8_t _en);
+uint8_t kvmv_hdmi_signal_active(void);
 
 #ifdef __cplusplus
 }

server/proto/vm.go

@@ -99,6 +99,7 @@ type GetOLEDRsp struct {
 
 type GetGetHdmiStateRsp struct {
 	Enabled     bool `json:"enabled"`
+	Signal      bool `json:"signal"`
 	IdleTimeout int  `json:"idleTimeout"`
 }
 

server/service/vm/hdmi.go

@@ -27,6 +27,7 @@ var (
 	setHDMI            = func(enabled bool) { common.GetKvmVision().SetHDMI(enabled) }
 	isHdmiDisabled     = utils.IsHdmiDisabled
 	getHdmiIdleTimeout = utils.GetHDMIIdleTimeout
+	getHdmiSignal      = func() bool { return common.GetKvmVision().HasHDMISignal() }
 )
 
 func (s *Service) ResetHdmi(c *gin.Context) {
@@ -63,10 +64,12 @@ func (s *Service) DisableHdmi(c *gin.Context) {
 
 func (s *Service) GetHdmiState(c *gin.Context) {
 	var rsp proto.Response
+	enabled := !isHdmiDisabled()
 
 	rsp.OkRspWithData(c, &proto.GetGetHdmiStateRsp{
-		Enabled:     !utils.IsHdmiDisabled(),
-		IdleTimeout: utils.GetHDMIIdleTimeout(),
+		Enabled:     enabled,
+		Signal:      enabled && getHdmiSignal(),
+		IdleTimeout: getHdmiIdleTimeout(),
 	})
 
 	log.Debug("get hdmi state")