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|
//
// dolmetschctl
//
//
// Copyright (C) 2019 Christian Pointner <equinox@spreadspace.org>
//
// This file is part of dolmetschctl.
//
// dolmetschctl is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// dolmetschctl is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"fmt"
"log"
"spreadspace.org/dolmetschctl/pkg/mixer"
)
type State int
const (
StateNew = iota
StateSettling
StateSettled
)
func (s State) String() string {
switch s {
case StateNew:
return "new"
case StateSettling:
return "settling"
case StateSettled:
return "settled"
default:
return "unknown"
}
}
type Language string
func (l Language) String() string {
if l == "" {
return "none"
}
return string(l)
}
type LanguageChannel struct {
Num mixer.Channel
currentLevel mixer.FaderLevel
muted bool
}
type LanguageChannels struct {
main LanguageChannel
voice LanguageChannel
}
type selectLangRequest struct {
l Language
resultCh chan error
}
type StateMachine struct {
mixer *mixer.Mixer
selectLangCh chan selectLangRequest
quitCh chan bool
exitedCh chan struct{}
mixerEventCh chan mixer.Event
languages map[Language]LanguageChannels
channel2lang map[mixer.Channel]Language
currentState State
currentLang Language
targetLang Language
}
func (sm *StateMachine) selectLang(l Language) error {
if l != "" {
if _, exists := sm.languages[l]; !exists {
return fmt.Errorf("language '%s' does not exist", l)
}
}
sm.targetLang = l
log.Printf("new target language: '%s'", sm.targetLang)
return nil
}
func (sm *StateMachine) reconcile() {
if sm.targetLang == sm.currentLang {
sm.currentState = StateSettled
return
}
sm.currentState = StateSettling
}
func (sm *StateMachine) run() {
defer close(sm.exitedCh)
for {
select {
case req := <-sm.selectLangCh:
req.resultCh <- sm.selectLang(req.l)
case ev := <-sm.mixerEventCh:
log.Printf("got event from mixer: %v", ev)
// TODO: update mixer channel states...
case <-sm.quitCh:
return
}
oldState := sm.currentState
sm.reconcile()
if oldState != sm.currentState {
log.Printf("new state: %s", sm.currentState)
}
}
}
func NewStateMachine(m *mixer.Mixer) (*StateMachine, error) {
sm := &StateMachine{mixer: m}
sm.selectLangCh = make(chan selectLangRequest, 10)
sm.quitCh = make(chan bool, 1)
sm.exitedCh = make(chan struct{})
sm.mixerEventCh = make(chan mixer.Event, 1000)
sm.languages = make(map[Language]LanguageChannels)
sm.channel2lang = make(map[mixer.Channel]Language)
sm.currentState = StateNew
sm.currentLang = ""
sm.targetLang = ""
return sm, nil
}
func (sm *StateMachine) AddLanguage(name Language, main, voice mixer.Channel) error {
if name == "none" {
return fmt.Errorf("language 'none' is reserved")
}
if _, exists := sm.languages[name]; exists {
return fmt.Errorf("language '%s' already exists", name)
}
for ch := range []mixer.Channel{main, voice} {
if _, exists := sm.languages[name]; exists {
return fmt.Errorf("mixer channel %v is already in use by language '%s'", ch, name)
}
}
chMain := LanguageChannel{main, mixer.FaderLevel0db, false}
chVoice := LanguageChannel{voice, mixer.FaderLevel0db, false}
sm.languages[name] = LanguageChannels{chMain, chVoice}
sm.channel2lang[main] = name
sm.channel2lang[voice] = name
sm.mixer.Subscribe(main, sm.mixerEventCh)
sm.mixer.Subscribe(voice, sm.mixerEventCh)
return nil
}
func (sm *StateMachine) Start() {
go sm.run()
}
func (sm *StateMachine) SelectLanguage(l Language) error {
resultCh := make(chan error)
sm.selectLangCh <- selectLangRequest{l, resultCh}
return <-resultCh
}
func (sm *StateMachine) Shutdown() {
select {
case sm.quitCh <- true:
default:
}
<-sm.exitedCh
}
|
