/// <summary>
/// Releases the resources associated with the specified MidiHeader pointer.
/// </summary>
/// <param name="headerPtr">
/// The MidiHeader pointer.
/// </param>
public void Destroy(IntPtr headerPtr)
{
MidiHeader header = (MidiHeader)Marshal.PtrToStructure(headerPtr, typeof(MidiHeader));
Marshal.FreeHGlobal(header.data);
Marshal.FreeHGlobal(headerPtr);
}
private void HandleNoOp(object state)
{
IntPtr headerPtr = (IntPtr)state;
MidiHeader header = (MidiHeader)Marshal.PtrToStructure(headerPtr, typeof(MidiHeader));
byte[] midiEvent = new byte[SizeOfMidiEvent];
for (int i = 0; i < midiEvent.Length; i++)
{
midiEvent[i] = Marshal.ReadByte(header.data, header.offset + i);
}
// If this is a NoOp event.
if ((midiEvent[EventTypeIndex] & MEVT_NOP) == MEVT_NOP)
{
// Clear the event type byte.
midiEvent[EventTypeIndex] = 0;
NoOpEventArgs e = new NoOpEventArgs(BitConverter.ToInt32(midiEvent, EventCodeOffset));
context.Post(new SendOrPostCallback(delegate(object s)
{
OnNoOpOccurred(e);
}), null);
}
}
private void HandleInvalidSysExMessage(object state)
{
lock (lockObject)
{
IntPtr headerPtr = (IntPtr)state;
MidiHeader header = (MidiHeader)Marshal.PtrToStructure(headerPtr, typeof(MidiHeader));
if (!resetting)
{
byte[] data = new byte[header.bytesRecorded];
Marshal.Copy(header.data, data, 0, data.Length);
OnInvalidSysExMessageReceived(new InvalidSysExMessageEventArgs(data));
int result = AddSysExBuffer();
if (result != DeviceException.MMSYSERR_NOERROR)
{
Exception ex = new InputDeviceException(result);
OnError(new ErrorEventArgs(ex));
}
}
ReleaseBuffer(headerPtr);
}
}
/// <summary>
/// Builds the pointer to the MidiHeader structure.
/// </summary>
public void Build()
{
MidiHeader header = new MidiHeader();
// Initialize the MidiHeader.
header.bufferLength = BufferLength;
header.bytesRecorded = BufferLength;
header.data = Marshal.AllocHGlobal(BufferLength);
header.flags = 0;
// Write data to the MidiHeader.
for (int i = 0; i < BufferLength; i++)
{
Marshal.WriteByte(header.data, i, data[i]);
}
try
{
result = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(MidiHeader)));
}
catch (Exception)
{
Marshal.FreeHGlobal(header.data);
throw;
}
try
{
Marshal.StructureToPtr(header, result, false);
}
catch (Exception)
{
Marshal.FreeHGlobal(header.data);
Marshal.FreeHGlobal(result);
throw;
}
built = true;
}
/// <summary>
/// Builds the pointer to the MidiHeader structure.
/// </summary>
public void Build()
{
MidiHeader header = new MidiHeader();
// Initialize the MidiHeader.
header.bufferLength = BufferLength;
header.bytesRecorded = BufferLength;
header.data = Marshal.AllocHGlobal(BufferLength);
header.flags = 0;
// Write data to the MidiHeader.
for(int i = 0; i < BufferLength; i++)
{
Marshal.WriteByte(header.data, i, data[i]);
}
try
{
result = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(MidiHeader)));
}
catch(Exception)
{
Marshal.FreeHGlobal(header.data);
throw;
}
try
{
Marshal.StructureToPtr(header, result, false);
}
catch(Exception)
{
Marshal.FreeHGlobal(header.data);
Marshal.FreeHGlobal(result);
throw;
}
built = true;
}
private void HandleSysExMessage(object state)
{
lock (lockObject)
{
var param = (MidiInParams)state;
IntPtr headerPtr = param.Param1;
MidiHeader header = (MidiHeader)Marshal.PtrToStructure(headerPtr, typeof(MidiHeader));
if (!resetting)
{
for (int i = 0; i < header.bytesRecorded; i++)
{
sysExData.Add(Marshal.ReadByte(header.data, i));
}
if (sysExData.Count > 1 && sysExData[0] == 0xF0 && sysExData[sysExData.Count - 1] == 0xF7)
{
SysExMessage message = new SysExMessage(sysExData.ToArray());
message.Timestamp = param.Param2.ToInt32();
sysExData.Clear();
OnMessageReceived(message);
OnSysExMessageReceived(new SysExMessageEventArgs(message));
}
int result = AddSysExBuffer();
if (result != DeviceException.MMSYSERR_NOERROR)
{
Exception ex = new InputDeviceException(result);
OnError(new ErrorEventArgs(ex));
}
}
ReleaseBuffer(headerPtr);
}
}