Exemplo n.º 1
0
func (s *SystemPort) Open() error {
	if s.isOpen && s.stream == nil {
		return errors.New("Underlying portmidi port is already opened, " +
			"but stream is not connected to this SystemPort.")
	}
	if s.id == -1 || s.isOpen { // Fake port or opened already, ignore.
		return nil
	}
	var errNum C.PmError
	if s.IsInputPort {
		// The input / output naming LOOKS backwards, but we're opening a
		// portmidi "output stream" for input Ports and vice versa.
		errNum = C.Pm_OpenOutput(&(s.stream), C.PmDeviceID(s.id),
			nil, C.int32_t(512), nil, nil, 0)
	} else {
		errNum = C.Pm_OpenInput(&(s.stream), C.PmDeviceID(s.id),
			nil, C.int32_t(512), nil, nil)
	}
	if errNum == 0 {
		s.isOpen = true
		s.stop = make(chan bool, 1)
		s.noteOns = make(chan Note, BufferSize)
		s.noteOffs = make(chan Note, BufferSize)
		s.controlChanges = make(chan ControlChange, BufferSize)
	}
	return makePortMidiError(errNum)
}
Exemplo n.º 2
0
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
}
Exemplo n.º 3
0
// Returns the device info for the device indentified with deviceId.
func GetDeviceInfo(deviceId DeviceID) *DeviceInfo {
	info := C.Pm_GetDeviceInfo(C.PmDeviceID(deviceId))
	return &DeviceInfo{
		Interface:         C.GoString(info.interf),
		Name:              C.GoString(info.name),
		IsInputAvailable:  info.input > 0,
		IsOutputAvailable: info.output > 0,
		IsOpened:          info.opened > 0,
	}
}
Exemplo n.º 4
0
// Initializes a new output stream.
func NewOutputStream(deviceId DeviceId, bufferSize int64, latency int64) (stream *Stream, err error) {
	var str *C.PmStream
	errCode := C.Pm_OpenOutput(
		(*unsafe.Pointer)(unsafe.Pointer(&str)),
		C.PmDeviceID(deviceId), nil, C.int32_t(bufferSize), nil, nil, C.int32_t(latency))
	if errCode != 0 {
		return nil, convertToError(errCode)
	}
	return &Stream{deviceId: deviceId, pmStream: str}, nil
}
Exemplo n.º 5
0
// NewOutputStream initializes a new output stream.
func NewOutputStream(id DeviceID, bufferSize int64, latency int64) (stream *Stream, err error) {
	var str *C.PmStream
	errCode := C.Pm_OpenOutput(
		(*unsafe.Pointer)(unsafe.Pointer(&str)),
		C.PmDeviceID(id), nil, C.int32_t(bufferSize), nil, nil, C.int32_t(latency))
	if errCode != 0 {
		return nil, convertToError(errCode)
	}
	if info := Info(id); !info.IsOutputAvailable {
		return nil, ErrOutputUnavailable
	}
	return &Stream{deviceID: id, pmStream: str}, nil
}
Exemplo n.º 6
0
// Initializes a new input stream.
func NewInputStream(deviceId DeviceID, bufferSize int64) (stream *Stream, err error) {
	var str *C.PmStream
	errCode := C.Pm_OpenInput(
		(*unsafe.Pointer)(unsafe.Pointer(&str)),
		C.PmDeviceID(deviceId), nil, C.int32_t(bufferSize), nil, nil)
	if errCode != 0 {
		return nil, convertToError(errCode)
	}
	if info := GetDeviceInfo(deviceId); !info.IsInputAvailable {
		return nil, ErrInputUnavailable
	}
	return &Stream{deviceId: deviceId, pmStream: str}, nil
}