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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;

namespace Sanford.Multimedia.Midi
{
	/// <summary>
	/// Represents the basic class for all MIDI short messages.
	/// </summary>
    /// <remarks>
    /// MIDI short messages represent all MIDI messages except meta messages
    /// and system exclusive messages. This includes channel messages, system
    /// realtime messages, and system common messages.
    /// </remarks>
	public abstract class ShortMessage : IMidiMessage
	{
        #region ShortMessage Members

        #region Constants

        public const int DataMaxValue= 127;

        public const int StatusMaxValue = 255;

        //
        // Bit manipulation constants.
        //

        private const int StatusMask = ~255;
        protected const int DataMask = ~StatusMask;
        private const int Data1Mask = ~65280;
        private const int Data2Mask = ~Data1Mask + DataMask;
        private const int Shift = 8;

        #endregion

        protected int msg = 0;

        #region Methods

        public byte[] GetBytes()
        {
            return BitConverter.GetBytes(msg);
        }

        internal static int PackStatus(int message, int status)
        {
            #region Require

            if(status < 0 || status > StatusMaxValue)
            {
                throw new ArgumentOutOfRangeException("status", status,
                    "Status value out of range.");
            }

            #endregion            

            return (message & StatusMask) | status;
        }

        internal static int PackData1(int message, int data1)
        {
            #region Require

            if(data1 < 0 || data1 > DataMaxValue)
            {
                throw new ArgumentOutOfRangeException("data1", data1,
                    "Data 1 value out of range.");
            }

            #endregion

            return (message & Data1Mask) | (data1 << Shift);
        }

        internal static int PackData2(int message, int data2)
        {
            #region Require

            if(data2 < 0 || data2 > DataMaxValue)
            {
                throw new ArgumentOutOfRangeException("data2", data2,
                    "Data 2 value out of range.");
            }

            #endregion

            return (message & Data2Mask) | (data2 << (Shift * 2));
        }

        internal static int UnpackStatus(int message)
        {
            return message & DataMask;
        }

        internal static int UnpackData1(int message)
        {
            return (message & ~Data1Mask) >> Shift;
        }

        internal static int UnpackData2(int message)
        {
            return (message & ~Data2Mask) >> (Shift * 2);
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the short message as a packed integer.
        /// </summary>
        /// <remarks>
        /// The message is packed into an integer value with the low-order byte
        /// of the low-word representing the status value. The high-order byte
        /// of the low-word represents the first data value, and the low-order
        /// byte of the high-word represents the second data value.
        /// </remarks>
        public int Message
        {
            get
            {
                return msg;
            }
        }

        /// <summary>
        /// Gets the messages's status value.
        /// </summary>
        public int Status
        {
            get
            {
                return UnpackStatus(msg);
            }
        }

        public abstract MessageType MessageType
        {
            get;
        }
   
        #endregion

        #endregion
	}
}

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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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