66 lines
2.1 KiB
C#
66 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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namespace NAudio.Midi
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{
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/// <summary>
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/// Represents a MIDI track sequence number event event
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/// </summary>
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public class TrackSequenceNumberEvent : MetaEvent
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{
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private ushort sequenceNumber;
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/// <summary>
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/// Creates a new track sequence number event
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/// </summary>
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public TrackSequenceNumberEvent(ushort sequenceNumber)
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{
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this.sequenceNumber = sequenceNumber;
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}
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/// <summary>
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/// Reads a new track sequence number event from a MIDI stream
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/// </summary>
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/// <param name="br">The MIDI stream</param>
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/// <param name="length">the data length</param>
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public TrackSequenceNumberEvent(BinaryReader br, int length)
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{
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// TODO: there is a form of the TrackSequenceNumberEvent that
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// has a length of zero
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if(length != 2)
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{
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throw new FormatException("Invalid sequence number length");
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}
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sequenceNumber = (ushort) ((br.ReadByte() << 8) + br.ReadByte());
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}
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/// <summary>
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/// Creates a deep clone of this MIDI event.
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/// </summary>
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public override MidiEvent Clone() => (TrackSequenceNumberEvent)MemberwiseClone();
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/// <summary>
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/// Describes this event
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/// </summary>
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/// <returns>String describing the event</returns>
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public override string ToString()
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{
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return String.Format("{0} {1}", base.ToString(), sequenceNumber);
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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)((sequenceNumber >> 8) & 0xFF));
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writer.Write((byte)(sequenceNumber & 0xFF));
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}
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}
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}
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