ChannelStopper.cs

#region License

/* Copyright (c) 2006 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: [email protected]
 */

#endregion

using System;
using System.Collections;

namespace Sanford.Multimedia.Midi
{
    public class ChannelStopper
    {
        private ChannelMessage[,] noteOnMessage;

        private bool[] holdPedal1Message;

        private bool[] holdPedal2Message;

        private bool[] sustenutoMessage;

        private ChannelMessageBuilder builder = new ChannelMessageBuilder();

        public event EventHandler<StoppedEventArgs> Stopped;

        public ChannelStopper()
        {
            int c = ChannelMessage.MidiChannelMaxValue + 1;
            int d = ShortMessage.DataMaxValue + 1;

            noteOnMessage = new ChannelMessage[c, d];

            holdPedal1Message = new bool[c];
            holdPedal2Message = new bool[c];
            sustenutoMessage = new bool[c];
        }

        public void Process(ChannelMessage message)
        {
            switch(message.Command)
            {
                case ChannelCommand.NoteOn:
                    if(message.Data2 > 0)
                    {
                        noteOnMessage[message.MidiChannel, message.Data1] = message;
                    }
                    else
                    {
                        noteOnMessage[message.MidiChannel, message.Data1] = null;
                    }
                    break;

                case ChannelCommand.NoteOff:
                    noteOnMessage[message.MidiChannel, message.Data1] = null;
                    break;

                case ChannelCommand.Controller:
                    switch(message.Data1)
                    {
                        case (int)ControllerType.HoldPedal1:
                            if(message.Data2 > 63)
                            {
                                holdPedal1Message[message.MidiChannel] = true;
                            }
                            else
                            {
                                holdPedal1Message[message.MidiChannel] = false;
                            }
                            break;

                        case (int)ControllerType.HoldPedal2:
                            if(message.Data2 > 63)
                            {
                                holdPedal2Message[message.MidiChannel] = true;
                            }
                            else
                            {
                                holdPedal2Message[message.MidiChannel] = false;
                            }
                            break;

                        case (int)ControllerType.SustenutoPedal:
                            if(message.Data2 > 63)
                            {
                                sustenutoMessage[message.MidiChannel] = true;
                            }
                            else
                            {
                                sustenutoMessage[message.MidiChannel] = false;
                            }
                            break;
                    }
                    break;
            }
        }

        public void AllSoundOff()
        {
            ArrayList stoppedMessages = new ArrayList();

            for(int c = 0; c <= ChannelMessage.MidiChannelMaxValue; c++)
            {
                for(int n = 0; n <= ShortMessage.DataMaxValue; n++)
                {
                    if(noteOnMessage[c, n] != null)
                    {
                        builder.MidiChannel = c;
                        builder.Command = ChannelCommand.NoteOff;
                        builder.Data1 = noteOnMessage[c, n].Data1;
                        builder.Build();

                        stoppedMessages.Add(builder.Result);

                        noteOnMessage[c, n] = null;
                    }
                }

                if(holdPedal1Message[c])
                {
                    builder.MidiChannel = c;
                    builder.Command = ChannelCommand.Controller;
                    builder.Data1 = (int)ControllerType.HoldPedal1;
                    builder.Build();

                    stoppedMessages.Add(builder.Result);

                    holdPedal1Message[c] = false;
                }

                if(holdPedal2Message[c])
                {
                    builder.MidiChannel = c;
                    builder.Command = ChannelCommand.Controller;
                    builder.Data1 = (int)ControllerType.HoldPedal2;
                    builder.Build();

                    stoppedMessages.Add(builder.Result);

                    holdPedal2Message[c] = false;
                }

                if(sustenutoMessage[c])
                {
                    builder.MidiChannel = c;
                    builder.Command = ChannelCommand.Controller;
                    builder.Data1 = (int)ControllerType.SustenutoPedal;
                    builder.Build();

                    stoppedMessages.Add(builder.Result);

                    sustenutoMessage[c] = false;
                }
            }

            OnStopped(new StoppedEventArgs(stoppedMessages));
        }

        public void Reset()
        {
            for(int c = 0; c <= ChannelMessage.MidiChannelMaxValue; c++)
            {
                for(int n = 0; n <= ShortMessage.DataMaxValue; n++)
                {
                    noteOnMessage[c, n] = null;
                }

                holdPedal1Message[c] = false;
                holdPedal2Message[c] = false;
                sustenutoMessage[c] = false;
            }
        }

        protected virtual void OnStopped(StoppedEventArgs e)
        {
            EventHandler<StoppedEventArgs> handler = Stopped;

            if(handler != null)
            {
                handler(this, e);
            }
        }
    }
}