private void DestroyHandle()
{
if (_handle == IntPtr.Zero)
{
return;
}
MidiOutWinApi.midiOutClose(_handle);
}
private void EnsureHandleIsCreated()
{
if (_handle != IntPtr.Zero)
{
return;
}
_callback = OnMessage;
ProcessMmResult(MidiOutWinApi.midiOutOpen(out _handle, Id, _callback, IntPtr.Zero, MidiWinApi.CallbackFunction));
}
private void UnprepareSysExBuffer(IntPtr headerPointer)
{
if (headerPointer == IntPtr.Zero)
{
return;
}
MidiOutWinApi.midiOutUnprepareHeader(_handle, headerPointer, MidiWinApi.MidiHeaderSize);
var header = (MidiWinApi.MIDIHDR)Marshal.PtrToStructure(headerPointer, typeof(MidiWinApi.MIDIHDR));
Marshal.FreeHGlobal(header.lpData);
Marshal.FreeHGlobal(headerPointer);
}
private void SendSysExEvent(SysExEvent sysExEvent)
{
var data = sysExEvent.Data;
if (data == null || !data.Any())
{
return;
}
var headerPointer = PrepareSysExBuffer(data);
_sysExHeadersPointers.Add(headerPointer);
ProcessMmResult(MidiOutWinApi.midiOutLongMsg(_handle, headerPointer, MidiWinApi.MidiHeaderSize));
}
private void SetDeviceInformation()
{
var caps = default(MidiOutWinApi.MIDIOUTCAPS);
ProcessMmResult(MidiOutWinApi.midiOutGetDevCaps(new IntPtr(Id), ref caps, (uint)Marshal.SizeOf(caps)));
SetBasicDeviceInformation(caps.wMid, caps.wPid, caps.vDriverVersion, caps.szPname);
DeviceType = (OutputDeviceType)caps.wTechnology;
VoicesNumber = caps.wVoices;
NotesNumber = caps.wNotes;
Channels = (from channel in FourBitNumber.Values
let isChannelSupported = (caps.wChannelMask >> channel) & 1
where isChannelSupported == 1
select channel).ToArray();
var support = (MidiOutWinApi.MIDICAPS)caps.dwSupport;
SupportsPatchCaching = support.HasFlag(MidiOutWinApi.MIDICAPS.MIDICAPS_CACHE);
SupportsVolumeControl = support.HasFlag(MidiOutWinApi.MIDICAPS.MIDICAPS_VOLUME);
SupportsLeftRightVolumeControl = support.HasFlag(MidiOutWinApi.MIDICAPS.MIDICAPS_LRVOLUME);
}
private IntPtr PrepareSysExBuffer(byte[] data)
{
var bufferLength = data.Length + 1;
var dataPointer = Marshal.AllocHGlobal(bufferLength);
Marshal.WriteByte(dataPointer, EventStatusBytes.Global.NormalSysEx);
Marshal.Copy(data, 0, IntPtr.Add(dataPointer, 1), data.Length);
var header = new MidiWinApi.MIDIHDR
{
lpData = dataPointer,
dwBufferLength = bufferLength,
dwBytesRecorded = bufferLength
};
var headerPointer = Marshal.AllocHGlobal(MidiWinApi.MidiHeaderSize);
Marshal.StructureToPtr(header, headerPointer, false);
ProcessMmResult(MidiOutWinApi.midiOutPrepareHeader(_handle, headerPointer, MidiWinApi.MidiHeaderSize));
return(headerPointer);
}
private void SendShortEvent(MidiEvent midiEvent)
{
var message = PackShortEvent(midiEvent);
ProcessMmResult(MidiOutWinApi.midiOutShortMsg(_handle, (uint)message));
}
/// <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(MidiOutWinApi.midiOutGetErrorText(mmrError, pszText, cchText));
}
/// <summary>
/// Retrieves the number of output MIDI devices presented in the system.
/// </summary>
/// <returns>Number of output MIDI devices presented in the system.</returns>
public static int GetDevicesCount()
{
return((int)MidiOutWinApi.midiOutGetNumDevs());
}
internal override MMRESULT GetErrorText(MMRESULT mmrError, StringBuilder pszText, uint cchText)
{
return(MidiOutWinApi.midiOutGetErrorText(mmrError, pszText, cchText));
}
private void DestroyHandle()
{
MidiOutWinApi.midiOutClose(_handle);
}
public static int GetDevicesCount()
{
// TODO: process last error
// TODO: uint instead of int
return(MidiOutWinApi.midiOutGetNumDevs());
}
