99 lines
3.1 KiB
C#
99 lines
3.1 KiB
C#
using System;
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using System.IO;
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using System.Text;
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namespace NAudio.Midi
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{
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/// <summary>
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/// Represents a MIDI pitch wheel change event
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/// </summary>
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public class PitchWheelChangeEvent : MidiEvent
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{
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private int pitch;
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/// <summary>
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/// Reads a pitch wheel change event from a MIDI stream
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/// </summary>
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/// <param name="br">The MIDI stream to read from</param>
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public PitchWheelChangeEvent(BinaryReader br)
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{
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byte b1 = br.ReadByte();
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byte b2 = br.ReadByte();
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if((b1 & 0x80) != 0)
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{
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// TODO: might be a follow-on
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throw new FormatException("Invalid pitchwheelchange byte 1");
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}
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if((b2 & 0x80) != 0)
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{
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throw new FormatException("Invalid pitchwheelchange byte 2");
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}
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pitch = b1 + (b2 << 7); // 0x2000 is normal
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}
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/// <summary>
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/// Creates a new pitch wheel change event
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/// </summary>
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/// <param name="absoluteTime">Absolute event time</param>
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/// <param name="channel">Channel</param>
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/// <param name="pitchWheel">Pitch wheel value</param>
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public PitchWheelChangeEvent(long absoluteTime, int channel, int pitchWheel)
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: base(absoluteTime, channel, MidiCommandCode.PitchWheelChange)
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{
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Pitch = pitchWheel;
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}
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/// <summary>
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/// Describes this pitch wheel change event
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/// </summary>
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/// <returns>String describing this pitch wheel change event</returns>
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public override string ToString()
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{
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return String.Format("{0} Pitch {1} ({2})",
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base.ToString(),
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this.pitch,
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this.pitch - 0x2000);
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}
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/// <summary>
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/// Pitch Wheel Value 0 is minimum, 0x2000 (8192) is default, 0x3FFF (16383) is maximum
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/// </summary>
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public int Pitch
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{
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get
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{
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return pitch;
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}
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set
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{
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if (value < 0 || value >= 0x4000)
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{
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throw new ArgumentOutOfRangeException("value", "Pitch value must be in the range 0 - 0x3FFF");
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}
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pitch = value;
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}
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}
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/// <summary>
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/// Gets a short message
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/// </summary>
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/// <returns>Integer to sent as short message</returns>
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public override int GetAsShortMessage()
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{
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return base.GetAsShortMessage() + ((pitch & 0x7f) << 8) + (((pitch >> 7) & 0x7f) << 16);
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}
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/// <summary>
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/// Calls base class export first, then exports the data
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/// specific to this event
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/// <seealso cref="MidiEvent.Export">MidiEvent.Export</seealso>
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/// </summary>
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public override void Export(ref long absoluteTime, BinaryWriter writer)
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{
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base.Export(ref absoluteTime, writer);
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writer.Write((byte)(pitch & 0x7f));
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writer.Write((byte)((pitch >> 7) & 0x7f));
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}
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}
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} |