Golang Midicps示例

说明

golang midicps示例是从最受好评的开源项目中提取的实现代码，你可以参考下面示例的使用方式。

编程语言: Golang

命名空间/包名称: github.com/scgolang/sc

示例#1

文件： main.go 项目： scgolang/pattern

func (pat *randomNotes) Next() (float32, error) {
	scale := scales[rand.Intn(len(scales))]
	if pat.idx%128 == 0 {
		scale = scales[rand.Intn(numScales)]
		pat.idx = 0
	}
	pat.idx++
	return sc.Midicps(int(scale[rand.Intn(pattern.ScaleLen)]) + 12*(rand.Intn(octaveMax)+octaveMin)), nil
}

示例#2

文件： melody.go 项目： scgolang/examples

func main() {
	const synthName = "sineTone"
	var synthID int32
	var note int
	var gain, dur float32

	// setup supercollider client
	client, err := sc.NewClient("udp", "127.0.0.1:57111", "127.0.0.1:57110", 5*time.Second)
	if err != nil {
		log.Fatal(err)
	}
	defaultGroup, err := client.AddDefaultGroup()
	if err != nil {
		log.Fatal(err)
	}
	err = client.DumpOSC(int32(1))
	if err != nil {
		log.Fatal(err)
	}
	def := sc.NewSynthdef(synthName, func(p sc.Params) sc.Ugen {
		freq := p.Add("freq", 440)
		gain := p.Add("gain", 0.5)
		dur := p.Add("dur", 1)
		bus := sc.C(0)
		env := sc.EnvGen{
			Env:        sc.EnvPerc{Release: dur},
			LevelScale: gain,
			Done:       sc.FreeEnclosing,
		}.Rate(sc.KR)
		sig := sc.SinOsc{Freq: freq}.Rate(sc.AR).Mul(env)
		return sc.Out{bus, sig}.Rate(sc.AR)
	})
	err = client.SendDef(def)
	if err != nil {
		log.Fatal(err)
	}

	ticker := time.NewTicker(125 * time.Millisecond)

	for _ = range ticker.C {
		synthID = client.NextSynthID()
		note = rand.Intn(128)
		gain = rand.Float32()
		dur = rand.Float32()
		ctls := map[string]float32{
			"freq": sc.Midicps(float32(note)),
			"gain": gain,
			"dur":  dur,
		}
		_, err = defaultGroup.Synth(synthName, synthID, sc.AddToTail, ctls)
	}
}

示例#3

文件： ctrl.go 项目： scgolang/dx7

// FromNote implements poly.Controller.
func (dx7 *DX7) FromNote(note *poly.Note) map[string]float32 {
	var (
		ctrls = map[string]float32{"gate": float32(1)}
		freq  = sc.Midicps(note.Note)
		gain  = float32(note.Velocity) / (poly.MaxMIDI * polyphony)
	)

	for op := range ops {
		ctrls[ctrlName(op, "freq")] = freq
		ctrls[ctrlName(op, "gain")] = gain
		ctrls[ctrlName(op, "amt")] = dx7.ctrls["op1amt"]
		ctrls[ctrlName(op, "freqscale")] = dx7.ctrls["op2freqscale"]
		ctrls[ctrlName(op, "decay")] = dx7.ctrls["op2decay"]
		ctrls[ctrlName(op, "sustain")] = dx7.ctrls["op2sustain"]
	}

	return ctrls
}

示例#4

文件： oxygen.go 项目： scgolang/examples

func main() {
	var synthID int32
	const synthName = "sineTone"

	// Set up SuperCollider client.
	client, err := sc.NewClient("udp", "127.0.0.1:57121", "127.0.0.1:57120", 5*time.Second)
	if err != nil {
		log.Fatal(err)
	}
	_, err = client.AddDefaultGroup()
	if err != nil {
		log.Fatal(err)
	}
	err = client.DumpOSC(int32(1))
	if err != nil {
		log.Fatal(err)
	}
	def := sc.NewSynthdef(synthName, func(p sc.Params) sc.Ugen {
		freq := p.Add("freq", 440)
		gain := p.Add("gain", 0.5)
		bus := sc.C(0)
		env := sc.EnvGen{
			Env:        sc.EnvPerc{},
			Done:       sc.FreeEnclosing,
			LevelScale: gain,
		}.Rate(sc.KR)
		sig := sc.SinOsc{Freq: freq}.Rate(sc.AR).Mul(env)
		return sc.Out{bus, sig}.Rate(sc.AR)
	})
	err = client.SendDef(def)
	if err != nil {
		log.Fatal(err)
	}

	// initialize midi
	portmidi.Initialize()
	// this code can be uncommented to discover the
	// device ID's portmidi comes up with
	// deviceCount := portmidi.CountDevices()
	// enc := json.NewEncoder(os.Stdout)
	// for i := 0; i < deviceCount; i++ {
	// 	info := portmidi.GetDeviceInfo(portmidi.DeviceId(i))
	// 	log.Printf("device %d - ", i)
	// 	err = enc.Encode(info)
	// 	if err != nil {
	// 		log.Fatal(err)
	// 	}
	// }

	// setup midi input stream and listen for midi events
	in, err := portmidi.NewInputStream(3, 1024)
	if err != nil {
		log.Fatal(err)
	}
	ch := in.Listen()
	for event := range ch {
		if event.Status == 144 {
			// MIDI note
			log.Printf("Note %-3d Velocity %-3d\n", event.Data1, event.Data2)
			if event.Data2 > 0 {
				// Note On
				synthID = client.NextSynthID()
				ctls := map[string]float32{
					"freq": sc.Midicps(float32(event.Data1)),
					"gain": float32(event.Data2 / 127.0),
				}
				_, err = client.Synth(synthName, synthID, sc.AddToTail, sc.DefaultGroupID, ctls)
			}
		}
	}
	portmidi.Terminate()
}