func hostsAndDevices() ([]*HostApiInfo, []*DeviceInfo, error) {
if !cached {
nhosts := C.Pa_GetHostApiCount()
ndevs := C.Pa_GetDeviceCount()
if nhosts < 0 {
return nil, nil, newError(C.PaError(nhosts))
}
if ndevs < 0 {
return nil, nil, newError(C.PaError(ndevs))
}
devices = make([]*DeviceInfo, ndevs)
hosti := make([]C.PaHostApiIndex, ndevs)
for i := range devices {
i := C.PaDeviceIndex(i)
paDev := C.Pa_GetDeviceInfo(i)
devices[i] = &DeviceInfo{
index: i,
Name: C.GoString(paDev.name),
MaxInputChannels: int(paDev.maxInputChannels),
MaxOutputChannels: int(paDev.maxOutputChannels),
DefaultLowInputLatency: duration(paDev.defaultLowInputLatency),
DefaultLowOutputLatency: duration(paDev.defaultLowOutputLatency),
DefaultHighInputLatency: duration(paDev.defaultHighInputLatency),
DefaultHighOutputLatency: duration(paDev.defaultHighOutputLatency),
DefaultSampleRate: float64(paDev.defaultSampleRate),
}
hosti[i] = paDev.hostApi
}
hostApis = make([]*HostApiInfo, nhosts)
for i := range hostApis {
i := C.PaHostApiIndex(i)
paHost := C.Pa_GetHostApiInfo(i)
devs := make([]*DeviceInfo, paHost.deviceCount)
for j := range devs {
devs[j] = devices[C.Pa_HostApiDeviceIndexToDeviceIndex(i, C.int(j))]
}
hostApis[i] = &HostApiInfo{
Type: HostApiType(paHost._type),
Name: C.GoString(paHost.name),
DefaultInputDevice: lookupDevice(devices, paHost.defaultInputDevice),
DefaultOutputDevice: lookupDevice(devices, paHost.defaultOutputDevice),
Devices: devs,
}
}
for i := range devices {
devices[i].HostApi = hostApis[hosti[i]]
}
cached = true
}
return hostApis, devices, nil
}
// GetDeviceCount function as declared in portaudio/portaudio.h:371
func GetDeviceCount() DeviceIndex {
__ret := C.Pa_GetDeviceCount()
__v := (DeviceIndex)(__ret)
return __v
}