Esempio n. 1
0
func (m Meter) OpenStream() *Stream {
	var p portaudio.StreamParameters
	p = portaudio.LowLatencyParameters(m.Fast["i"].Dev[0].DevInfo, m.Fast["o"].Dev[0].DevInfo)
	numSamples := 256
	p.FramesPerBuffer = numSamples // It *might* be better to leave this unspecified.
	p.Input.Channels = 1
	p.Output.Channels = 1
	osxWarningText := `OS X 10.11 portaudio known issue (you can safely ignore the following WARNING):
        https://www.assembla.com/spaces/portaudio/tickets/243-portaudio-support-for-os-x-10-11-el-capitan
        https://lists.columbia.edu/pipermail/portaudio/2015-October/000092.html
        `
	if runtime.GOOS == "darwin" {
		out, err := exec.Command("sw_vers", "-productVersion").Output()
		if err != nil {
			fmt.Printf("sw_vers -productVersion failed to get OS X version: %v\n", err)
		} else {
			ver := strings.Split(string(out), ".")
			if ver[0] == "10" && ver[1] == "11" {
				fmt.Printf("%s", osxWarningText)
			}
		}
	}

	s := &Stream{}
	var err error
	if s.Stream, err = portaudio.OpenStream(p, s.process); err != nil {
		fmt.Printf("portaudio.OpenStream failed: ", err)
		panic(err)
	}
	if err = s.Start(); err != nil {
		fmt.Printf("portaudio.Stream.Start failed: ", err)
		panic(err)
	}
	return s
}
Esempio n. 2
0
func newEcho(delay time.Duration) *echo {
	h, err := portaudio.DefaultHostApi()
	chk(err)
	p := portaudio.LowLatencyParameters(h.DefaultInputDevice, h.DefaultOutputDevice)
	p.Input.Channels = 1
	p.Output.Channels = 1
	e := &echo{buffer: make([]float32, int(p.SampleRate*delay.Seconds()))}
	e.Stream, err = portaudio.OpenStream(p, e.processAudio)
	chk(err)
	return e
}
Esempio n. 3
0
func (m Meter) OpenStream() *Stream {
	var p portaudio.StreamParameters
	p = portaudio.LowLatencyParameters(m.Fast["i"].Dev[0].DevInfo, m.Fast["o"].Dev[0].DevInfo)
	numSamples := SAMPLES
	p.FramesPerBuffer = numSamples // It *might* be better to leave this unspecified.
	p.Input.Channels = 1
	p.Output.Channels = 1
	osxWarningText := `OS X 10.11 portaudio known issue (you can safely ignore the following WARNING):
        https://www.assembla.com/spaces/portaudio/tickets/243-portaudio-support-for-os-x-10-11-el-capitan
        https://lists.columbia.edu/pipermail/portaudio/2015-October/000092.html
        `
	if runtime.GOOS == "darwin" {
		out, err := exec.Command("sw_vers", "-productVersion").Output()
		if err != nil {
			fmt.Printf("sw_vers -productVersion failed to get OS X version: %v\n", err)
		} else {
			ver := strings.Split(string(out), ".")
			if ver[0] == "10" && ver[1] == "11" {
				fmt.Printf("%s", osxWarningText)
			}
		}
	}

	s := &Stream{}
	var err error
	if s.Stream, err = portaudio.OpenStream(p, s.process); err != nil {
		fmt.Printf("portaudio.OpenStream failed: %v", err)
		panic(err)
	}
	fmt.Printf("sample rate: %g Hz\n", s.Stream.Info().SampleRate)
	var noiseprev int32
	for i := range s.noise {
		v := int32(rand.Uint32()) >> 1
		noiseprev = noiseprev - noiseprev>>FILTER_FREQ_BITS + v>>FILTER_FREQ_BITS
		s.noise[i] = v - noiseprev
	}
	for i := range s.fir {
		sinci := float64(i-len(s.fir)/2) * math.Pi / (FILTER_FREQ * 4)
		sinc := float64(1)
		if sinci != 0 {
			sinc = math.Sin(sinci) / sinci
		}
		wingain := 4.0 / FILTER_FREQ
		hammingwin := math.Sin(float64(i+len(s.fir)/2) * math.Pi / (FIR_NUM_TAPS * 2))
		s.fir[i] = int32(wingain * hammingwin * sinc * float64(1<<32))
	}
	if err = s.Start(); err != nil {
		fmt.Printf("portaudio.Stream.Start failed: %v", err)
		panic(err)
	}
	return s
}
Esempio n. 4
0
func openStream(cbk interface{}) (*portaudio.Stream, error) {
	outDev, err := portaudio.DefaultOutputDevice()
	if err != nil {
		return nil, err
	}

	p := portaudio.LowLatencyParameters(nil, outDev)

	p.Input.Channels = 0
	p.Output.Channels = 2
	p.SampleRate = sampleRate
	p.FramesPerBuffer = 0
	return portaudio.OpenStream(p, cbk)
}