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
}
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
}
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
}
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)
}