func main() {
portaudio.Initialize()
defer portaudio.Terminate()
hs, err := portaudio.HostApis()
chk(err)
err = tmpl.Execute(os.Stdout, hs)
chk(err)
}
//Creates a new engine and populates it with the core functions
func LoadAudio(e *Engine) *Engine {
e = add(e, "portaudio.init", NewCode("portaudio.init", 0, func(e *Engine, c *Thingy) *Engine {
portaudio.Initialize()
return e
}))
e = add(e, "portaudio.terminate", NewCode("portaudio.terminate", 0, func(e *Engine, c *Thingy) *Engine {
defer portaudio.Terminate()
return e
}))
e = add(e, "portaudio.setData", NewCode("setData", 3, func(ne *Engine, c *Thingy) *Engine {
var posString, buffWrap, valString *Thingy
posString, ne.dataStack = popStack(ne.dataStack)
valString, ne.dataStack = popStack(ne.dataStack)
buffWrap, ne.dataStack = popStack(ne.dataStack)
var pos, _ = strconv.ParseInt(posString.getSource(), 10, 32)
var val, _ = strconv.ParseFloat(valString.getSource(), 32)
out := buffWrap._structVal.([][]float32)
out[0][pos] = float32(val)
return ne
}))
e = add(e, "portaudio.start", NewCode("portaudio.start", -1, func(e *Engine, c *Thingy) *Engine {
//AudioCallbackState = e.RunString("CLEARSTACK", "setup audio callback")
AudioCallbackState = e
stream, err := portaudio.OpenDefaultStream(0, 2, sampleRate, 0, processAudio)
chk(err)
stream.Start()
chk(err)
e.dataStack = pushStack(e.dataStack, NewWrapper(stream))
chk(err)
return e
}))
e = add(e, "portaudio.HostApis", NewCode("portaudio.HostApis", 0, func(e *Engine, c *Thingy) *Engine {
var tmpl = template.Must(template.New("").Parse(
`[ {{range .}}
H[
Name [ {{.Name}} ]
{{if .DefaultInputDevice}}DefaultInput [ {{.DefaultInputDevice.Name}} ] {{end}}
{{if .DefaultOutputDevice}}DefaultOutput [ {{.DefaultOutputDevice.Name}} ] {{end}}
Devices [ {{range .Devices}}
H[
Name [ {{.Name}} ]
MaxInputChannels [ {{.MaxInputChannels}} ]
MaxOutputChannels [ {{.MaxOutputChannels}} ]
DefaultLowInputLatency [ {{.DefaultLowInputLatency}} ]
DefaultLowOutputLatency [ {{.DefaultLowOutputLatency}} ]
DefaultHighInputLatency [ {{.DefaultHighInputLatency}} ]
DefaultHighOutputLatency [ {{.DefaultHighOutputLatency}} ]
DefaultSampleRate [ {{.DefaultSampleRate}} ]
]H
{{end}}
]
]H
{{end}}
]`,
))
var b bytes.Buffer
hs, err := portaudio.HostApis()
chk(err)
err = tmpl.Execute(&b, hs)
chk(err)
s := b.String()
fmt.Println(s)
return e
}))
return e
}
func (m *Meter) Initialize() {
hs, err := portaudio.HostApis()
if err != nil {
fmt.Println("portaudio.HostApis failed:", err)
panic(err)
}
m.Fast = make(map[string]*MeterFast)
m.Fast["i"] = &MeterFast{}
m.Fast["o"] = &MeterFast{}
for _, hai := range hs {
apistr := hai.Type.String()
if hai.Name != apistr {
apistr = fmt.Sprintf("%s \"%s\"", apistr, hai.Name)
}
all := make(map[string][]*MeterFastDev)
for k := range m.Fast {
all[k] = make([]*MeterFastDev, 0, len(hai.Devices))
}
minLatency := make(map[string]float64)
for i, d := range hai.Devices {
appendLowLatency := func(k string, numch int, latency float64) {
// some devices do not support low latency, indicated by a latency of -1
if numch > 0 && latency > 0 {
all[k] = append(all[k], &MeterFastDev{"", i, d, latency})
cur, ok := minLatency[k]
if !ok || cur > latency {
minLatency[k] = latency
}
}
}
appendLowLatency("i", d.MaxInputChannels, d.DefaultLowInputLatency.Seconds())
appendLowLatency("o", d.MaxOutputChannels, d.DefaultLowOutputLatency.Seconds())
}
for k, s := range all {
for _, d := range s {
if (d.Latency - minLatency[k]) >= 1e-3 {
continue
}
d.Name = d.DevInfo.Name
switch {
case hai.DefaultInputDevice == d.DevInfo && hai.DefaultOutputDevice == d.DevInfo:
d.Name = d.Name + " (default_in_out)"
case hai.DefaultInputDevice == d.DevInfo:
d.Name = d.Name + " (default_in)"
case hai.DefaultOutputDevice == d.DevInfo:
d.Name = d.Name + " (default_out)"
}
m.Fast[k].Dev = append(m.Fast[k].Dev, d)
}
}
}
for k, s := range m.Fast {
if len(s.Dev) < 1 {
fmt.Printf("Warning(ch.%s): no known latency on any device. making something up...", k)
h, err := portaudio.DefaultHostApi()
if err != nil {
fmt.Printf("portaudio.DefaultHostApi failed: ", err)
panic(err)
}
defdev := make(map[string]*portaudio.DeviceInfo)
defdev["i"] = h.DefaultInputDevice
defdev["o"] = h.DefaultOutputDevice
m.Fast[k].Dev = append(m.Fast[k].Dev, &MeterFastDev{
Name: "defdev" + k,
haiIndex: 0, // Completely made up.
DevInfo: defdev[k],
Latency: 1000, // Completely made up.
})
}
}
}
