func getSystemDevices() (inputs, outputs []SystemDevice) {
numDevices := int(C.Pm_CountDevices())
for i := 0; i < numDevices; i++ {
info := C.Pm_GetDeviceInfo(C.PmDeviceID(i))
name := C.GoString(info.name)
var isInputPort, isOutputPort, isOpen bool
if info.output > 0 { // "output" means "output stream" in portmidi-speak.
isInputPort = true // An OUTPUT stream is for an INPUT port.
}
if info.input > 0 { // "input" means "input stream" in portmidi-speak.
isOutputPort = true // An INPUT stream is for an OUTPUT port.
}
if info.opened > 0 {
isOpen = true
}
port := &SystemPort{isOpen: isOpen, id: i, IsInputPort: isInputPort}
device := SystemDevice{Name: name}
if isInputPort {
device.inPort = port
device.outPort = &SystemPort{isOpen: false, id: -1}
inputs = append(inputs, device)
} else if isOutputPort {
device.outPort = port
device.inPort = &SystemPort{isOpen: false, id: -1}
outputs = append(outputs, device)
}
}
return inputs, outputs
}
// Returns the number of MIDI devices.
func CountDevices() int {
return int(C.Pm_CountDevices())
}