make target and current channel state explicit

1 files changed, 43 insertions, 14 deletions

diff --git a/cmd/dolmetschctld/statemachine.go b/cmd/dolmetschctld/statemachine.go
index e5ea0a9..0198c7d 100644
--- a/cmd/dolmetschctld/statemachine.go
+++ b/cmd/dolmetschctld/statemachine.go
@@ -59,12 +59,17 @@ func (l Language) String() string {
 	return string(l)
 }
 
-type MixerChannel struct {
-	num   mixer.Channel
+type MixerChannelState struct {
 	level mixer.FaderLevel
 	mute  mixer.Mute
 }
 
+type MixerChannel struct {
+	num     mixer.Channel
+	target  MixerChannelState
+	current MixerChannelState
+}
+
 type MixerChannels struct {
 	main  MixerChannel
 	voice MixerChannel
@@ -128,27 +133,46 @@ func (sm *StateMachine) handleMixerEvent(ev mixer.Event) {
 
 	switch ev.Type {
 	case mixer.EventFaderChange:
-		mc.level = ev.Level
+		mc.current.level = ev.Level
 	case mixer.EventMute:
-		mc.mute = ev.Mute
+		mc.current.mute = ev.Mute
 	}
+}
 
-	log.Printf("status of mixer channels for language '%s' is now:", lang)
-	log.Printf("  main(%d):  level=%s, muted=%s", mcs.main.num, mcs.main.level, mcs.main.mute)
-	log.Printf("  voice(%d): level=%s, muted=%s", mcs.voice.num, mcs.voice.level, mcs.voice.mute)
+// make sure that our state and the mixer are in sync
+func (sm *StateMachine) initMixer() {
+	for _, mcs := range sm.languages {
+		sm.mixer.SetLevel(mcs.main.num, mixer.FaderLevel0db-1)
+		sm.mixer.SetLevel(mcs.main.num, mixer.FaderLevel0db)
+		sm.mixer.Mute(mcs.main.num)
+		sm.mixer.Unmute(mcs.main.num)
+		mcs.main.target.level = mixer.FaderLevel0db
+		mcs.main.target.mute = mixer.MuteUnmuted
+
+		sm.mixer.SetLevel(mcs.voice.num, mixer.FaderLevelOff+1)
+		sm.mixer.SetLevel(mcs.voice.num, mixer.FaderLevelOff)
+		sm.mixer.Unmute(mcs.voice.num)
+		sm.mixer.Mute(mcs.voice.num)
+		mcs.voice.target.level = mixer.FaderLevelOff
+		mcs.voice.target.mute = mixer.MuteMuted
+	}
+	sm.currentLang = ""
+	sm.targetLang = ""
+	sm.currentState = StateSettled
 }
 
 func (sm *StateMachine) reconcile() {
-	if sm.targetLang == sm.currentLang {
-		sm.currentState = StateSettled
-		return
+	if sm.currentState == StateSettled {
+
 	}
-	sm.currentState = StateSettling
+
+	// TODO: implement me!!!!
 }
 
 func (sm *StateMachine) run() {
 	defer close(sm.exitedCh)
 
+	sm.initMixer()
 	for {
 		select {
 		case req := <-sm.selectLangCh:
@@ -180,11 +204,14 @@ func NewStateMachine(m *mixer.Mixer) (*StateMachine, error) {
 	sm.currentState = StateNew
 	sm.currentLang = ""
 	sm.targetLang = ""
-
 	return sm, nil
 }
 
+// TODO: currently we can only deal with 2 languages...
 func (sm *StateMachine) AddLanguage(name Language, main, voice mixer.Channel) error {
+	if sm.currentState != StateNew {
+		return fmt.Errorf("adding languages is only allowed during startup")
+	}
 	if name == "none" {
 		return fmt.Errorf("language 'none' is reserved")
 	}
@@ -197,8 +224,10 @@ func (sm *StateMachine) AddLanguage(name Language, main, voice mixer.Channel) er
 		}
 	}
 
-	chMain := MixerChannel{main, mixer.FaderLevelUnknown, mixer.MuteUnknown}
-	chVoice := MixerChannel{voice, mixer.FaderLevelUnknown, mixer.MuteUnknown}
+	unknown := MixerChannelState{level: mixer.FaderLevelUnknown, mute: mixer.MuteUnknown}
+	chMain := MixerChannel{num: main, current: unknown, target: unknown}
+	chVoice := MixerChannel{num: voice, current: unknown, target: unknown}
+
 	sm.languages[name] = &MixerChannels{chMain, chVoice}
 	sm.channel2lang[main] = name
 	sm.channel2lang[voice] = name