/
generators.go
204 lines (173 loc) · 4.33 KB
/
generators.go
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package main
import (
"fmt"
"log"
"strconv"
"strings"
"github.com/peterbourgon/field"
)
type demoGenerator struct {
id string
keyDownEvents chan keyEvent
keyUpEvents chan keyEvent
keysDown keySet // MIDI keys
connects chan connectRequest
disconnects chan string
connected string
output chan []float32
quit chan chan struct{}
}
func newDemoGenerator(id string) *demoGenerator {
g := &demoGenerator{
id: id,
keysDown: keySet{},
keyDownEvents: make(chan keyEvent),
keyUpEvents: make(chan keyEvent),
connects: make(chan connectRequest),
disconnects: make(chan string),
connected: "",
output: nil,
quit: make(chan chan struct{}),
}
go g.loop()
return g
}
func (g *demoGenerator) stop() {
q := make(chan struct{})
g.quit <- q
<-q
}
func (g *demoGenerator) loop() {
log.Printf("%s: started", g.ID())
defer log.Printf("%s: done", g.ID())
for {
select {
case g.output <- nextBufferMany(sine, g.keysDown):
//log.Printf("%s ♪", g.ID())
break
case k := <-g.keyDownEvents:
log.Printf("%s: press %d", g.ID(), k.midi)
g.keysDown.add(k.midi) // TODO velocity
log.Printf("%s: keys down %v", g.ID(), g.keysDown)
case k := <-g.keyUpEvents:
log.Printf("%s: lift %d", g.ID(), k.midi)
if k.midi == 0 {
g.keysDown = keySet{} // reset
} else {
g.keysDown.remove(k.midi)
}
log.Printf("%s: keys down %v", g.ID(), g.keysDown)
case r := <-g.connects:
if g.output != nil {
r.e <- fmt.Errorf("%s already connected to %s", g.ID(), g.connected)
continue
}
g.connected = r.r.ID()
g.output = make(chan []float32, 1)
r.r.receive(g.output)
r.e <- nil
log.Printf("%s → %s", g.ID(), r.r.ID())
case id := <-g.disconnects:
if g.output == nil {
log.Printf("%s: disconnect, but not connected", g.ID())
continue
}
if g.connected != id {
log.Printf("%s: connected to %s, not %s (bug in field)", g.ID(), g.connected, id)
continue
}
g.connected = ""
close(g.output)
g.output = nil
log.Printf("%s ✕ %s", g.ID(), id)
case q := <-g.quit:
close(q)
return
}
}
}
func (g *demoGenerator) parse(input string) {
input = strings.TrimSpace(strings.ToLower(input))
toks := strings.Split(input, " ")
if len(toks) <= 0 {
log.Printf("clock: parse empty")
return
}
switch toks[0] {
case "keydown", "kd", "down", "d":
if len(toks) < 2 {
log.Printf("%s: %s: not enough", g.ID(), input)
return
}
midi, err := strconv.ParseInt(toks[1], 10, 32)
if err != nil {
log.Printf("%s: %s: %s", g.ID(), input, err)
return
}
velocity := 1.0
if len(toks) >= 3 {
velocity, err = strconv.ParseFloat(toks[2], 32)
if err != nil {
log.Printf("%s: %s: %s", g.ID(), input, err)
return
}
}
g.keyDownEvents <- keyEvent{int(midi), float32(velocity)}
case "keyup", "ku", "up", "u":
if len(toks) < 2 {
log.Printf("%s: %s: not enough", g.ID(), input)
return
}
midi, err := strconv.ParseInt(toks[1], 10, 32)
if err != nil {
log.Printf("%s: %s: %s", g.ID(), input, err)
return
}
velocity := 1.0
if len(toks) >= 3 {
velocity, err = strconv.ParseFloat(toks[2], 32)
if err != nil {
log.Printf("%s: %s: %s", g.ID(), input, err)
return
}
}
g.keyUpEvents <- keyEvent{int(midi), float32(velocity)}
case "reset", "release":
g.keyUpEvents <- keyEvent{}
}
}
func (g *demoGenerator) ID() string { return g.id }
func (g *demoGenerator) Connect(n field.Node) error {
r, ok := n.(audioReceiver)
if !ok {
return fmt.Errorf("%s not audioReceiver", n.ID())
}
req := connectRequest{r, make(chan error)}
g.connects <- req
return <-req.e
}
func (g *demoGenerator) Disconnect(n field.Node) {
if _, ok := n.(audioReceiver); !ok {
log.Printf("%s not audioReceiver", n.ID())
return
}
g.disconnects <- n.ID()
}
func (g *demoGenerator) Connection(n field.Node) error {
log.Printf("%s: Connection(%s): no", g.ID(), n.ID())
return errNo
}
func (g *demoGenerator) Disconnection(n field.Node) {
log.Printf("%s: Disonnection(%s): ignored", g.ID(), n.ID())
}
type connectRequest struct {
r audioReceiver
e chan error
}
type keyEvent struct {
midi int // key
velocity float32 // 0..1
}
type keySet map[int]float32 // MIDI key: phase
func (s keySet) add(i int) { s[i] = 0.0 }
func (s keySet) remove(i int) { delete(s, i) }