Golang portaudio.Initialize函数代码示例

func (spotify *Spotify) finishInitialisation(webApiAuth bool, pa *portAudio) error {
	if webApiAuth {
		if spotify.client = webapi.Auth(); spotify.client != nil {
			if privateUser, err := spotify.client.CurrentUser(); err == nil {
				if privateUser.ID != spotify.session.LoginUsername() {
					return errors.New("Username doesn't match with web-api authorization")
				}
			} else {
				spotify.client = nil
			}
		}
	}
	// init audio could happen after initPlaylist but this logs to output therefore
	// the screen isn't built properly
	portaudio.Initialize()
	go pa.player()
	defer portaudio.Terminate()

	if err := spotify.initPlaylist(); err != nil {
		return err
	}

	spotify.waitForEvents()
	return nil
}

func main() {
	flag.Parse()

	portaudio.Initialize()
	defer portaudio.Terminate()

	portmidi.Initialize()
	defer portmidi.Terminate()

	if *doDemo {
		if err := demo(); err != nil {
			log.Println(err)
		}
		return
	}

	http.Handle("/", http.FileServer(http.Dir("static")))
	http.HandleFunc("/socket", socket.Handler)

	l, err := net.Listen("tcp", *listenAddr)
	if err != nil {
		log.Fatal(err)
	}
	go http.Serve(l, nil)

	u := fmt.Sprintf("http://%v/", *listenAddr)
	if !*doBrowser || !openBrowser(u) {
		fmt.Printf("Open your web browser to %v\n\n", u)
	}

	fmt.Println("Press enter to quit...")
	os.Stdin.Read([]byte{0})
}

func main() {
	w := &window{voices: map[int]*sineVoice{}}
	p := audio.Params{SampleRate: 96000}
	audio.Init(w, p)

	portaudio.Initialize()
	defer portaudio.Terminate()
	s, err := portaudio.OpenDefaultStream(0, 1, p.SampleRate, 64, w.processAudio)
	if err != nil {
		fmt.Println(err)
		return
	}
	if err := s.Start(); err != nil {
		fmt.Println(err)
		return
	}
	defer s.Stop()

	if err := gui.Run(func() {
		gui.NewWindow(w, "beep", func(win *gui.Window) {
			w.Window = win
			gui.SetKeyFocus(w)
		})
	}); err != nil {
		fmt.Println(err)
	}
}

func main() {
	portaudio.Initialize()
	defer portaudio.Terminate()
	hs, err := portaudio.HostApis()
	chk(err)
	err = tmpl.Execute(os.Stdout, hs)
	chk(err)
}

func main() {
	portaudio.Initialize()
	defer portaudio.Terminate()
	e := newEcho(time.Second / 3)
	defer e.Close()
	chk(e.Start())
	time.Sleep(4 * time.Second)
	chk(e.Stop())
}

func main() {
	portaudio.Initialize()
	defer portaudio.Terminate()
	s := newStereoSine(256, 320, sampleRate)
	defer s.Close()
	chk(s.Start())
	time.Sleep(2 * time.Second)
	chk(s.Stop())
}

// Slightly modified exact copy of the portaudio example
func record(f *os.File, timer <-chan time.Time) {
	// form chunk
	_, _ = f.WriteString("FORM")
	binary.Write(f, binary.BigEndian, int32(0))
	_, _ = f.WriteString("AIFF")

	// common chunk
	_, _ = f.WriteString("COMM")
	binary.Write(f, binary.BigEndian, int32(18))
	binary.Write(f, binary.BigEndian, int16(1))
	binary.Write(f, binary.BigEndian, int32(0))
	binary.Write(f, binary.BigEndian, int16(32))
	_, _ = f.Write([]byte{0x40, 0x0e, 0xac, 0x44, 0, 0, 0, 0, 0, 0}) //80-bit sample rate 44100

	// sound chunk
	_, _ = f.WriteString("SSND")
	binary.Write(f, binary.BigEndian, int32(0))
	binary.Write(f, binary.BigEndian, int32(0))
	binary.Write(f, binary.BigEndian, int32(0))
	nSamples := 0
	defer func() {
		// fill in missing sizes
		totalBytes := 4 + 8 + 18 + 8 + 8 + 4*nSamples
		_, _ = f.Seek(4, 0)
		binary.Write(f, binary.BigEndian, int32(totalBytes))
		_, _ = f.Seek(22, 0)
		binary.Write(f, binary.BigEndian, int32(nSamples))
		_, _ = f.Seek(42, 0)
		binary.Write(f, binary.BigEndian, int32(4*nSamples+8))
		f.Close()
	}()

	portaudio.Initialize()
	defer portaudio.Terminate()
	in := make([]int32, 64)
	stream, _ := portaudio.OpenDefaultStream(1, 0, 44100, len(in), in)
	defer stream.Close()

	stream.Start()
	defer stream.Stop()

	for {
		stream.Read()
		binary.Write(f, binary.BigEndian, in)
		nSamples += len(in)
		select {
		case <-timer:
			return
		default:
		}
	}
}

func (spotify *Spotify) finishInitialisation(pa *portAudio) error {
	// init audio could happen after initPlaylist but this logs to output therefore
	// the screen isn't built properly
	portaudio.Initialize()
	go pa.player()
	defer portaudio.Terminate()

	if err := spotify.initPlaylist(); err != nil {
		return err
	}

	spotify.waitForEvents()
	return nil
}

func (a *app) OnInit() {
	var err error
	a.r, err = os.Open(*in)
	if err != nil {
		log.Fatalf("Unable to open file '%s': %s", *in, err)
	}
	var wm webm.WebM
	a.reader, err = webm.Parse(a.r, &wm)
	if err != nil {
		log.Fatal("Unable to parse file: ", err)
	}
	a.duration = wm.GetDuration()
	var vtrack *webm.TrackEntry
	if !*justaudio {
		vtrack = wm.FindFirstVideoTrack()
	}
	var vstream *webm.Stream
	if vtrack != nil {
		vstream = webm.NewStream(vtrack)
		a.fduration = vtrack.GetDefaultDuration()
		a.vchan = vstream.VideoChannel()
	}
	var atrack *webm.TrackEntry
	if !*justvideo {
		atrack = wm.FindFirstAudioTrack()
	}
	var astream *webm.Stream
	if atrack != nil {
		astream = webm.NewStream(atrack)
	}
	splitter := webm.NewSplitter(a.reader.Chan)
	splitter.Split(astream, vstream)

	a.steps = uint(0xffffffff)
	if a.vchan != nil {
		a.img = <-a.vchan
		a.pimg = a.img
	}

	if atrack != nil {
		channels := int(atrack.Audio.Channels)
		a.aw = &AudioWriter{ch: astream.AudioChannel(),
			channels: channels, active: true}
		chk(portaudio.Initialize())
		a.pastream, err = portaudio.OpenDefaultStream(0, channels,
			atrack.Audio.SamplingFrequency, 0, a.aw.processAudio)
		chk(err)
		chk(a.pastream.Start())
	}
}

func main() {
	portaudio.Initialize()
	defer portaudio.Terminate()
	h, err := portaudio.DefaultHostApi()
	chk(err)
	stream, err := portaudio.OpenStream(portaudio.HighLatencyParameters(nil, h.DefaultOutputDevice), func(out []int32) {
		for i := range out {
			out[i] = int32(rand.Uint32())
		}
	})
	chk(err)
	defer stream.Close()
	chk(stream.Start())
	time.Sleep(time.Second)
	chk(stream.Stop())
}

func main() {
	flag.Parse()
	if *random {
		*seed = time.Now().UnixNano()
		fmt.Println("seed =", *seed)
	}
	if *seed != math.MinInt64 {
		*random = true
	}
	rand.Seed(*seed)

	portaudio.Initialize()
	defer portaudio.Terminate()

	p := audio.Params{SampleRate: 48000}

	m := audio.MultiVoice{}
	audio.Init(&m, p)
	// for _, x := range [][2]float64{{1, 1}, {2, 1}, {3, 1}, {4, 1}, {5, 1}, {3, 2}, {4, 3}, {5, 4}, {7, 4}, {6, 5}, {7, 5}, {8, 5}, {9, 5}} {
	for xy := 1; xy <= 60; xy++ {
		for x := 2; x <= int(math.Sqrt(float64(xy))); x++ {
			if y := xy / x; x*y == xy && relPrime(x, y) {
				x, y, xy := float64(x), float64(y), float64(xy)
				c := math.Exp(-xy * math.Log2(y/x) / 12)
				f := y / x
				phase := 0.0
				if *random {
					phase = rand.Float64()
				}
				m.Add(newSineBeat(.5*c, 128*f, 1/xy, phase, .1/f))
			}
		}
	}

	s, err := portaudio.OpenDefaultStream(0, 1, p.SampleRate, 512, func(out []float32) {
		for i := range out {
			out[i] = float32(audio.Saturate(m.Sing()))
		}
	})
	if err != nil {
		panic(err)
	}
	s.Start()
	fmt.Println("Press Enter to stop.")
	fmt.Scanln()
	s.Stop()
}

func (self *Server) Start() error {
	portaudio.Initialize()
	defer portaudio.Terminate()

	var err error

	if err = self.startAudio(); err != nil {
		return err
	}

	if err = self.startSerial(); err != nil {
		return err
	}

	if err = self.startHttp(); err != nil {
		return err
	}

	return nil
}

func init() {
	portaudio.Initialize()
	go func() {
		defer os.Exit(0)
		sig := make(chan os.Signal, 1)
		signal.Notify(sig)
		if <-sig == syscall.SIGQUIT {
			buf := make([]byte, 1<<10)
			for runtime.Stack(buf, true) == len(buf) {
				buf = make([]byte, 2*len(buf))
			}
			fmt.Fprintln(os.Stderr, string(buf))
		}
		for _, c := range playControls {
			c.Stop()
			<-c.Done
		}
		portaudio.Terminate()
	}()
}

func Run(paths []string) {
	// initialize audio
	portaudio.Initialize()
	defer portaudio.Terminate()

	audio := NewAudio()
	if err := audio.Start(); err != nil {
		log.Fatalln(err)
	}
	defer audio.Stop()

	// initialize glfw
	if err := glfw.Init(); err != nil {
		log.Fatalln(err)
	}
	defer glfw.Terminate()

	// create window
	glfw.WindowHint(glfw.ContextVersionMajor, 2)
	glfw.WindowHint(glfw.ContextVersionMinor, 1)
	window, err := glfw.CreateWindow(width*scale, height*scale, title, nil, nil)
	if err != nil {
		log.Fatalln(err)
	}
	window.MakeContextCurrent()

	// initialize gl
	if err := gl.Init(); err != nil {
		log.Fatalln(err)
	}
	gl.Enable(gl.TEXTURE_2D)

	// run director
	director := NewDirector(window, audio)
	director.Start(paths)
}

func main() {
	if len(os.Args) < 2 {
		fmt.Println("missing required argument:  output file name")
		return
	}
	fmt.Println("Recording.  Press Ctrl-C to stop.")

	sig := make(chan os.Signal, 1)
	signal.Notify(sig, os.Interrupt, os.Kill)

	fileName := os.Args[1]
	if !strings.HasSuffix(fileName, ".aiff") {
		fileName += ".aiff"
	}
	f, err := os.Create(fileName)
	chk(err)

	// form chunk
	_, err = f.WriteString("FORM")
	chk(err)
	chk(binary.Write(f, binary.BigEndian, int32(0))) //total bytes
	_, err = f.WriteString("AIFF")
	chk(err)

	// common chunk
	_, err = f.WriteString("COMM")
	chk(err)
	chk(binary.Write(f, binary.BigEndian, int32(18)))                  //size
	chk(binary.Write(f, binary.BigEndian, int16(1)))                   //channels
	chk(binary.Write(f, binary.BigEndian, int32(0)))                   //number of samples
	chk(binary.Write(f, binary.BigEndian, int16(32)))                  //bits per sample
	_, err = f.Write([]byte{0x40, 0x0e, 0xac, 0x44, 0, 0, 0, 0, 0, 0}) //80-bit sample rate 44100
	chk(err)

	// sound chunk
	_, err = f.WriteString("SSND")
	chk(err)
	chk(binary.Write(f, binary.BigEndian, int32(0))) //size
	chk(binary.Write(f, binary.BigEndian, int32(0))) //offset
	chk(binary.Write(f, binary.BigEndian, int32(0))) //block
	nSamples := 0
	defer func() {
		// fill in missing sizes
		totalBytes := 4 + 8 + 18 + 8 + 8 + 4*nSamples
		_, err = f.Seek(4, 0)
		chk(err)
		chk(binary.Write(f, binary.BigEndian, int32(totalBytes)))
		_, err = f.Seek(22, 0)
		chk(err)
		chk(binary.Write(f, binary.BigEndian, int32(nSamples)))
		_, err = f.Seek(42, 0)
		chk(err)
		chk(binary.Write(f, binary.BigEndian, int32(4*nSamples+8)))
		chk(f.Close())
	}()

	portaudio.Initialize()
	defer portaudio.Terminate()
	in := make([]int32, 64)
	stream, err := portaudio.OpenDefaultStream(1, 0, 44100, len(in), in)
	chk(err)
	defer stream.Close()

	chk(stream.Start())
	for {
		chk(stream.Read())
		chk(binary.Write(f, binary.BigEndian, in))
		nSamples += len(in)
		select {
		case <-sig:
			return
		default:
		}
	}
	chk(stream.Stop())
}