/// <summary>
/// Closes the MIDI input device
/// </summary>
public override void Close()
{
if (MidiInputDeviceState.Closed != _state)
{
if (MidiInputDeviceState.Started == _state)
{
Stop();
}
// flush any pending events
Reset();
var sz = Marshal.SizeOf(typeof(MIDIHDR));
var ptr = _inHeader.lpData;
// in case the header is being used:
if (0 != _inHeader.dwFlags && MHDR_PREPARED != (_inHeader.dwFlags & MHDR_PREPARED))
{
while ((_inHeader.dwFlags & MHDR_DONE) != MHDR_DONE)
{
Thread.Sleep(1);
}
}
_CheckInResult(midiInUnprepareHeader(_handle, ref _inHeader, sz));
_CheckInResult(midiInClose(_handle));
Marshal.FreeHGlobal(ptr);
_state = MidiInputDeviceState.Closed;
Interlocked.Exchange(ref _timeBase, 24);
Interlocked.Exchange(ref _microTempo, 500000);
}
}
/// <summary>
/// Stops the MIDI input device
/// </summary>
public void Stop()
{
if (IntPtr.Zero == _handle)
{
throw new InvalidOperationException("The device is closed.");
}
_CheckInResult(midiInStop(_handle));
_state = MidiInputDeviceState.Stopped;
}
/// <summary>
/// Opens the MIDI input device
/// </summary>
public override void Open()
{
Close();
_CheckInResult(midiInOpen(out _handle, _index, _callback, 0, CALLBACK_FUNCTION));
var sz = Marshal.SizeOf(typeof(MIDIHDR));
_inHeader.dwBufferLength = _inHeader.dwBytesRecorded = 65536u;
_inHeader.lpData = _buffer = Marshal.AllocHGlobal(65536);
_CheckInResult(midiInPrepareHeader(_handle, ref _inHeader, sz));
_CheckInResult(midiInAddBuffer(_handle, ref _inHeader, sz));
_state = MidiInputDeviceState.Stopped;
}
/// <summary>
/// Closes the MIDI input device
/// </summary>
public override void Close()
{
if (MidiInputDeviceState.Closed != _state)
{
if (MidiInputDeviceState.Started == _state)
{
Stop();
}
// flush any pending events
Reset();
var sz = Marshal.SizeOf(typeof(MIDIHDR));
var ptr = _inHeader.lpData;
_CheckInResult(midiInUnprepareHeader(_handle, ref _inHeader, sz));
_CheckInResult(midiInClose(_handle));
Marshal.FreeHGlobal(ptr);
_state = MidiInputDeviceState.Closed;
_timeBase = 96;
_microTempo = 500000;
}
}
internal MidiInputDevice(int deviceIndex)
{
if (0 > deviceIndex)
{
throw new ArgumentOutOfRangeException("deviceIndex");
}
_handle = IntPtr.Zero;
_callback = new MidiInProc(_MidiInProc);
_index = deviceIndex;
_state = MidiInputDeviceState.Closed;
_recordingLastTimestamp = 0L;
_recordingPos = 0;
_recordingTrack0 = null;
_recordingSequence = null;
_microTempo = 500000; // 120BPM
_timeBase = 96;
_timingTimestamp = 0L;
_tempoSynchMininumTempo = 50d;
_tempoSynchEnabled = 0; // false
_tempoSyncFrequency = 0L;
_tempoSyncTimestamp = 0L;
_CheckInResult(midiInGetDevCaps(deviceIndex, ref _caps, Marshal.SizeOf(typeof(MIDIINCAPS))));
}
