private void SetDeviceInformation()
{
var caps = default(MidiInWinApi.MIDIINCAPS);
ProcessMmResult(MidiInWinApi.midiInGetDevCaps(new IntPtr(Id), ref caps, (uint)Marshal.SizeOf(caps)));
SetBasicDeviceInformation(caps.wMid, caps.wPid, caps.vDriverVersion, caps.szPname);
}
public void Start()
{
EnsureDeviceIsNotDisposed();
EnsureHandleIsCreated();
PrepareSysExBuffer();
ProcessMmResult(() => MidiInWinApi.midiInStart(_handle));
_startTime = DateTime.UtcNow;
}
private void EnsureHandleIsCreated()
{
if (_handle != IntPtr.Zero)
{
return;
}
_callback = OnMessage;
ProcessMmResult(MidiInWinApi.midiInOpen(out _handle, Id, _callback, IntPtr.Zero, MidiWinApi.CallbackFunction));
}
private void DestroyHandle()
{
if (_handle == IntPtr.Zero)
{
return;
}
MidiInWinApi.midiInReset(_handle);
MidiInWinApi.midiInClose(_handle);
}
/// <summary>
/// Starts listening for incoming MIDI events on the current input device.
/// </summary>
/// <exception cref="ObjectDisposedException">The current <see cref="InputDevice"/> is disposed.</exception>
/// <exception cref="MidiDeviceException">An error occurred on device.</exception>
public void StartEventsListening()
{
EnsureDeviceIsNotDisposed();
EnsureHandleIsCreated();
PrepareSysExBuffer();
ProcessMmResult(MidiInWinApi.midiInStart(_handle));
IsListeningForEvents = true;
}
/// <summary>
/// Stops listening for incoming MIDI events on the current <see cref="InputDevice"/> and flushes
/// all pending data.
/// </summary>
/// <exception cref="ObjectDisposedException">The current <see cref="InputDevice"/> is disposed.</exception>
/// <exception cref="MidiDeviceException">An error occurred on device.</exception>
public void Reset()
{
EnsureDeviceIsNotDisposed();
if (_handle == IntPtr.Zero)
{
return;
}
ProcessMmResult(MidiInWinApi.midiInReset(_handle));
}
public void Reset()
{
EnsureDeviceIsNotDisposed();
if (_handle == IntPtr.Zero)
{
return;
}
ProcessMmResult(() => MidiInWinApi.midiInReset(_handle));
_startTime = DateTime.UtcNow;
}
/// <summary>
/// Stops listening for incoming MIDI events on the current input device.
/// </summary>
/// <exception cref="ObjectDisposedException">The current <see cref="InputDevice"/> is disposed.</exception>
/// <exception cref="MidiDeviceException">An error occurred on device.</exception>
public void StopEventsListening()
{
EnsureDeviceIsNotDisposed();
if (_handle == IntPtr.Zero)
{
return;
}
IsListeningForEvents = false;
ProcessMmResult(MidiInWinApi.midiInStop(_handle));
}
private void PrepareSysExBuffer()
{
var buffer = new byte[SysExBufferLength];
_sysExBufferPointer = Marshal.AllocHGlobal(buffer.Length);
Marshal.Copy(buffer, 0, _sysExBufferPointer, buffer.Length);
_sysExHeader = new MidiWinApi.MIDIHDR();
_sysExHeader.lpData = _sysExBufferPointer;
_sysExHeader.dwBufferLength = _sysExHeader.dwBytesRecorded = (uint)buffer.Length;
ProcessMmResult(() => MidiInWinApi.midiInPrepareHeader(_handle, ref _sysExHeader, Marshal.SizeOf(_sysExHeader)));
ProcessMmResult(() => MidiInWinApi.midiInAddBuffer(_handle, ref _sysExHeader, Marshal.SizeOf(_sysExHeader)));
}
private void UnprepareSysExBuffer(IntPtr headerPointer)
{
if (headerPointer == IntPtr.Zero)
{
return;
}
MidiInWinApi.midiInUnprepareHeader(_handle, headerPointer, MidiWinApi.MidiHeaderSize);
var header = (MidiWinApi.MIDIHDR)Marshal.PtrToStructure(headerPointer, typeof(MidiWinApi.MIDIHDR));
Marshal.FreeHGlobal(header.lpData);
Marshal.FreeHGlobal(headerPointer);
}
private void PrepareSysExBuffer()
{
var header = new MidiWinApi.MIDIHDR
{
lpData = Marshal.AllocHGlobal(SysExBufferLength),
dwBufferLength = SysExBufferLength,
dwBytesRecorded = SysExBufferLength
};
_sysExHeaderPointer = Marshal.AllocHGlobal(MidiWinApi.MidiHeaderSize);
Marshal.StructureToPtr(header, _sysExHeaderPointer, false);
ProcessMmResult(MidiInWinApi.midiInPrepareHeader(_handle, _sysExHeaderPointer, MidiWinApi.MidiHeaderSize));
ProcessMmResult(MidiInWinApi.midiInAddBuffer(_handle, _sysExHeaderPointer, MidiWinApi.MidiHeaderSize));
}
public static int GetDevicesCount()
{
// TODO: process last error
// TODO: uint instead of int
return(MidiInWinApi.midiInGetNumDevs());
}
private void UnprepareSysExBuffer()
{
ProcessMmResult(() => MidiInWinApi.midiInUnprepareHeader(_handle, ref _sysExHeader, Marshal.SizeOf(_sysExHeader)));
Marshal.FreeHGlobal(_sysExBufferPointer);
}
private void DestroyHandle()
{
MidiInWinApi.midiInClose(_handle);
}
/// <summary>
/// Gets error description for the specified MMRESULT which is return value of winmm function.
/// </summary>
/// <param name="mmrError">MMRESULT which is return value of winmm function.</param>
/// <param name="pszText"><see cref="StringBuilder"/> to write error description to.</param>
/// <param name="cchText">Size of <paramref name="pszText"/> buffer.</param>
/// <returns>Return value of winmm function which gets error description.</returns>
protected override uint GetErrorText(uint mmrError, StringBuilder pszText, uint cchText)
{
return(MidiInWinApi.midiInGetErrorText(mmrError, pszText, cchText));
}
/// <summary>
/// Retrieves the number of input MIDI devices presented in the system.
/// </summary>
/// <returns>Number of input MIDI devices presented in the system.</returns>
public static int GetDevicesCount()
{
return((int)MidiInWinApi.midiInGetNumDevs());
}
internal override MMRESULT GetErrorText(MMRESULT mmrError, StringBuilder pszText, uint cchText)
{
return(MidiInWinApi.midiInGetErrorText(mmrError, pszText, cchText));
}
private uint StopEventsListeningSilently()
{
IsListeningForEvents = false;
return(MidiInWinApi.midiInStop(_handle));
}
