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C# MIDI Toolkit

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18 Apr 2007MIT18 min read 3.1M   41.7K   303  
A toolkit for creating MIDI applications with C#.
#region License

/* Copyright (c) 2005 Leslie Sanford
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy 
 * of this software and associated documentation files (the "Software"), to 
 * deal in the Software without restriction, including without limitation the 
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 
 * sell copies of the Software, and to permit persons to whom the Software is 
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software. 
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
 * THE SOFTWARE.
 */

#endregion

#region Contact

/*
 * Leslie Sanford
 * Email: jabberdabber@hotmail.com
 */

#endregion

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using Multimedia;

namespace Multimedia.Midi
{
    public sealed partial class InputDevice : Device
    {
        private void HandleMessage(int handle, int msg, int instance, int param1, int param2)
        {
            if(msg == MIM_OPEN)
            {
            }
            else if(msg == MIM_CLOSE)
            {
            }
            else if(msg == MIM_DATA)
            {
                delegateQueue.BeginInvoke(shortMessageHandler, new object[] { param1 });
            }
            else if(msg == MIM_MOREDATA)
            {
                delegateQueue.BeginInvoke(shortMessageHandler, new object[] { param1 });
            }
            else if(msg == MIM_LONGDATA)
            {
                delegateQueue.BeginInvoke(sysExMessageHandler, new object[] { param1 });
            }
            else if(msg == MIM_ERROR)
            {
                delegateQueue.BeginInvoke(invalidShortMessageHandler, new object[] { param1 });
            }
            else if(msg == MIM_LONGERROR)
            {
                delegateQueue.BeginInvoke(invalidSysExMessageHandler, new object[] { param1 });
            }
        }

        private void HandleShortMessage(int message)
        {
            int status = ShortMessage.UnpackStatus(message);

            if(status >= (int)ChannelCommand.NoteOff &&
                status <= (int)ChannelCommand.PitchWheel +
                ChannelMessage.MidiChannelMaxValue)
            {
                cmBuilder.Message = message;
                cmBuilder.Build();

                if(SynchronizingObject != null)
                {
                    SynchronizingObject.BeginInvoke(
                        new GenericDelegate<ChannelMessage>(channelNotifier.Notify),
                        new object[] { cmBuilder.Result });
                }
                else
                {
                    channelNotifier.Notify(cmBuilder.Result);
                }
            }
            else if(status == (int)SysCommonType.MidiTimeCode ||
                status == (int)SysCommonType.SongPositionPointer ||
                status == (int)SysCommonType.SongSelect ||
                status == (int)SysCommonType.TuneRequest)
            {
                scBuilder.Message = message;
                scBuilder.Build();

                if(SynchronizingObject != null)
                {
                    SynchronizingObject.BeginInvoke(
                        new GenericDelegate<SysCommonMessage>(sysCommonNotifier.Notify), 
                        new object[] { scBuilder.Result });
                }
                else
                {
                    sysCommonNotifier.Notify(scBuilder.Result);
                }
            }
            else
            {
                SysRealtimeMessage sysRealtimeMessage = null;

                switch((SysRealtimeType)status)
                {
                    case SysRealtimeType.ActiveSense:
                        sysRealtimeMessage = SysRealtimeMessage.ActiveSenseMessage;
                        break;

                    case SysRealtimeType.Clock:
                        sysRealtimeMessage = SysRealtimeMessage.ClockMessage;
                        break;

                    case SysRealtimeType.Continue:
                        sysRealtimeMessage = SysRealtimeMessage.ContinueMessage;
                        break;

                    case SysRealtimeType.Reset:
                        sysRealtimeMessage = SysRealtimeMessage.ResetMessage;
                        break;

                    case SysRealtimeType.Start:
                        sysRealtimeMessage = SysRealtimeMessage.StartMessage;
                        break;

                    case SysRealtimeType.Stop:
                        sysRealtimeMessage = SysRealtimeMessage.StopMessage;
                        break;

                    case SysRealtimeType.Tick:
                        sysRealtimeMessage = SysRealtimeMessage.TickMessage;
                        break;
                }

                if(SynchronizingObject != null)
                {
                    SynchronizingObject.BeginInvoke(
                        new GenericDelegate<SysRealtimeMessage>(sysRealtimeNotifier.Notify), 
                        new object[] { sysRealtimeMessage });
                }
                else
                {
                    sysRealtimeNotifier.Notify(sysRealtimeMessage);
                }
            }
        }

        private void HandleSysExMessage(int param1)
        {
            lock(lockObject)
            {
                IntPtr headerPtr = new IntPtr(param1);
                MidiHeader header = (MidiHeader)Marshal.PtrToStructure(headerPtr, typeof(MidiHeader));

                if(header.bytesRecorded > 0 && !disposing)
                {
                    byte[] data = new byte[header.bytesRecorded];

                    Marshal.Copy(header.data, data, 0, data.Length);

                    SysExMessage message = new SysExMessage(data);

                    if(SynchronizingObject != null)
                    {
                        SynchronizingObject.BeginInvoke(onBufferFinished,
                            new object[] { new BufferFinishedEventArgs(data) });
                        SynchronizingObject.BeginInvoke(
                            new GenericDelegate<SysExMessage>(sysExNotifier.Notify), 
                            new object[] { message });
                    }
                    else
                    {
                        OnBufferFinished(new BufferFinishedEventArgs(data));
                        sysExNotifier.Notify(message);
                    }
                }

                int result = midiInUnprepareHeader(Handle, headerPtr, SizeOfMidiHeader);

                // The call to midiInUnpreapreHeader should not fail. 
                Debug.Assert(result == DeviceException.MMSYSERR_NOERROR);

                headerBuilder.Destroy(headerPtr);

                sysExBufferCount--;

                Debug.Assert(sysExBufferCount >= 0);

                Monitor.Pulse(lockObject);
            }
        }

        private void HandleInvalidShortMessage(int message)
        {
            if(SynchronizingObject != null)
            {
                SynchronizingObject.BeginInvoke(
                    new GenericDelegate<int>(invalidShortMessageNotifier.Notify), 
                    new object[] { message });
            }
            else
            {
                invalidShortMessageNotifier.Notify(message);
            }
        }

        private void HandleInvalidSysExMessage(int param1)
        {
            lock(lockObject)
            {
                IntPtr headerPtr = new IntPtr(param1);
                MidiHeader header = (MidiHeader)Marshal.PtrToStructure(headerPtr, typeof(MidiHeader));

                byte[] data = new byte[header.bytesRecorded];

                Marshal.Copy(header.data, data, 0, data.Length);

                if(!disposing)
                {
                    if(SynchronizingObject != null)
                    {
                        SynchronizingObject.BeginInvoke(onBufferFinished,
                            new object[] { new BufferFinishedEventArgs(data) });
                        SynchronizingObject.BeginInvoke(
                            new GenericDelegate<byte[]>(invalidSysExMessageNotifier.Notify),
                            new object[] { data });
                    }
                    else
                    {
                        OnBufferFinished(new BufferFinishedEventArgs(data));
                        invalidSysExMessageNotifier.Notify(data);
                    }
                }

                int result = midiInUnprepareHeader(Handle, headerPtr, SizeOfMidiHeader);

                // The call to midiInUnpreapreHeader should not fail. 
                Debug.Assert(result == DeviceException.MMSYSERR_NOERROR);

                headerBuilder.Destroy(headerPtr);

                sysExBufferCount--;

                Debug.Assert(sysExBufferCount >= 0);

                Monitor.Pulse(lockObject);
            }
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The MIT License


Written By
United States United States
Aside from dabbling in BASIC on his old Atari 1040ST years ago, Leslie's programming experience didn't really begin until he discovered the Internet in the late 90s. There he found a treasure trove of information about two of his favorite interests: MIDI and sound synthesis.

After spending a good deal of time calculating formulas he found on the Internet for creating new sounds by hand, he decided that an easier way would be to program the computer to do the work for him. This led him to learn C. He discovered that beyond using programming as a tool for synthesizing sound, he loved programming in and of itself.

Eventually he taught himself C++ and C#, and along the way he immersed himself in the ideas of object oriented programming. Like many of us, he gotten bitten by the design patterns bug and a copy of GOF is never far from his hands.

Now his primary interest is in creating a complete MIDI toolkit using the C# language. He hopes to create something that will become an indispensable tool for those wanting to write MIDI applications for the .NET framework.

Besides programming, his other interests are photography and playing his Les Paul guitars.

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