コード例 #1
0
ファイル: stream.go プロジェクト: adiknoth/portmidi
// ReadSysExBytes reads 4*max sysex bytes from the input stream.
func (s *Stream) ReadSysExBytes(max int) ([]byte, error) {
	if max > maxEventBufferSize {
		return nil, errMaxBuffer
	}
	if max < minEventBufferSize {
		return nil, errMinBuffer
	}
	buffer := make([]C.PmEvent, max)
	numEvents := C.Pm_Read(unsafe.Pointer(s.pmStream), &buffer[0], C.int32_t(max))
	msg := make([]byte, 4*numEvents)
	for i := 0; i < int(numEvents); i++ {
		msg[4*i+0] = byte(buffer[i].message & 0xFF)
		msg[4*i+1] = byte((buffer[i].message >> 8) & 0xFF)
		msg[4*i+2] = byte((buffer[i].message >> 16) & 0xFF)
		msg[4*i+3] = byte((buffer[i].message >> 24) & 0xFF)
	}
	return msg, nil
}
コード例 #2
0
ファイル: ports.go プロジェクト: lamproae/audio-1
func (s SystemPort) readEvent() (event Event, err error) {
	if s.IsInputPort {
		err = errors.New("Can only write, not read from input SystemPort.")
		return Event{}, err
	}
	var buffer C.PmEvent
	// Only read one event at a time.
	eventsRead := int(C.Pm_Read(s.stream, &buffer, C.int32_t(1)))
	if eventsRead > 0 {
		status := int(buffer.message) & 0xFF
		event.Channel = int(status & 0x0F)
		event.Command = int(status & 0xF0)
		event.Data1 = int((buffer.message >> 8) & 0xFF)
		event.Data2 = int((buffer.message >> 16) & 0xFF)
		return event, nil
	}
	return Event{}, nil // Nothing to read.
}
コード例 #3
0
ファイル: stream.go プロジェクト: andaru/portmidi
// Reads from the input stream, the max number events to be read are
// determined by max.
func (s *Stream) Read(max int) (events []Event, err error) {
	if max > maxEventBufferSize {
		return nil, errMaxBuffer
	}
	if max < minEventBufferSize {
		return nil, errMinBuffer
	}
	buffer := make([]C.PmEvent, max)
	numEvents := C.Pm_Read(unsafe.Pointer(s.pmStream), &buffer[0], C.int32_t(max))
	events = make([]Event, numEvents)
	for i := 0; i < int(numEvents); i++ {
		events[i] = Event{
			Timestamp: Timestamp(buffer[i].timestamp),
			Status:    int64(buffer[i].message) & 0xFF,
			Data1:     (int64(buffer[i].message) >> 8) & 0xFF,
			Data2:     (int64(buffer[i].message) >> 16) & 0xFF,
		}
	}
	return
}