private void HandleLongData(IntPtr wParam1, IntPtr wParam2)
{
if (MidiEventLongDataReceived == null)
{
return;
}
byte[]? data = null;
byte status;
lock (_syncRoot)
{
MidiInputLongDataBuffer buffer = _longMessageBuffers[wParam1];
// FIXME: this is a nasty workaround for https://github.com/atsushieno/managed-midi/issues/49
// We have no idea when/how this message is sent (midi in proc is not well documented).
if (buffer.Header.dwBytesRecorded == 0)
{
return;
}
status = Marshal.ReadByte(buffer.Header.lpData);
if (buffer.Header.dwBytesRecorded > 1)
{
data = new byte[buffer.Header.dwBytesRecorded - 1];
Marshal.Copy(buffer.Header.lpData, data, 1, ((int)buffer.Header.dwBytesRecorded) - 1);
}
if (!IsClosed)
{
buffer.Recycle();
}
else
{
_longMessageBuffers.Remove(buffer.Ptr);
buffer.Dispose();
}
}
MidiEventLongData e;
if (data == null)
{
e = new MidiEventLongData(status, null, 0, 0, (long)wParam2);
}
else
{
e = new MidiEventLongData(status, data, 0, data.Length, (long)wParam2);
}
MidiEventLongDataReceived?.Invoke(this, new MidiEventLongDataReceivedEventArgs(e));
}
public Win32MidiInput(uint id)
{
lock (_syncRoot)
{
_midiInProc = new NativeImports.MidiInProc(MidiInProc);
NativeImports.ThrowOnError(NativeImports.midiInOpen(out _midiHandle, id, _midiInProc, IntPtr.Zero));
NativeImports.ThrowOnError(NativeImports.midiInStart(_midiHandle));
while (_longMessageBuffers.Count < LongMessageBufferCount)
{
var b = new MidiInputLongDataBuffer(_midiHandle);
b.PrepareHeader();
b.AddBuffer();
_longMessageBuffers.Add(b.Ptr, b);
}
}
}