/// <summary>
/// Gets all MIDI resources needed to use the selected device.
/// </summary>
private void Acquire(MidiDevice device)
{
lock (_acquireLock)
{
if (device != null)
{
// setup the input device
if (device.CanRead)
{
// grab the device id by name
uint deviceId = 0;
if (_deviceIdByName.TryGetValue("IN_" + device.ID, out deviceId) == false)
{
throw new Exception("Could not find MIDI input device " + device.ID);
}
// start streaming the input
WinMM.CheckReturnCode(Win32API.midiInOpen(out _inputHandle, (UIntPtr)deviceId, _callback, (UIntPtr)0));
WinMM.CheckReturnCode(Win32API.midiInStart(_inputHandle));
_inputOpen = true;
}
else
{
_inputOpen = false;
}
// setup the output device
if (device.CanWrite)
{
// grab the device id by name
uint deviceId = 0;
if (_deviceIdByName.TryGetValue("OUT_" + device.ID, out deviceId) == false)
{
throw new Exception("Could not find MIDI output device " + device.ID);
}
// setup the device
WinMM.CheckReturnCode(Win32API.midiOutOpen(out _outputHandle, (UIntPtr)deviceId, null, (UIntPtr)0));
_outputOpen = true;
}
else
{
_outputOpen = false;
}
}
}
}
/// <summary>
/// Releases all currently used MIDI resources.
/// </summary>
private void Release()
{
lock (_acquireLock)
{
if (_inputOpen)
{
WinMM.CheckReturnCode(Win32API.midiInStop(_inputHandle));
WinMM.CheckReturnCode(Win32API.midiInClose(_inputHandle));
_inputOpen = false;
}
if (_outputOpen)
{
WinMM.CheckReturnCode(Win32API.midiOutReset(_outputHandle));// TODO: not sure if we should
WinMM.CheckReturnCode(Win32API.midiOutClose(_outputHandle));
_outputOpen = false;
}
}
}