private static string DescribeNumber(int type, byte[] bytes)
{
int n = MidiMetaEvent.GetDataLength(type);
if (bytes.Length < n)
{
return(null);
}
return(Midi.ReadNumber(bytes, 0, n).ToString());
}
private static string DescribeTempo(byte[] bytes)
{
int n = MidiMetaEvent.GetDataLength(MidiMetaEvent.SetTempoType);
if (bytes.Length < n)
{
return(null);
}
n = Midi.ReadNumber(bytes, 0, n);
return(string.Format("{0} {1} ({2} {3})", n, Properties.Resources.MicrosecondsPerQuarterNote,
(n == 0) ? double.PositiveInfinity : (60000000 / n), Properties.Resources.BeatsPerMinute));
}
/// <summary>Reads a number as an integer (in network byte order) from this file's byte array.</summary>
/// <param name="offset">
/// Offset into the byte array at which the number is stored (most significant byte first).
/// </param>
/// <param name="length">The number of bytes to read (should not be greater than 4).</param>
/// <returns>The number that is read.</returns>
public int ReadNumber(int offset, int length)
{
return(Midi.ReadNumber(this.Bytes, offset, length));
}
/// <summary>Attempts to convert the data bytes of a meta-event to a MidiKeySignature value.</summary>
/// <param name="bytes">The data bytes of the event.</param>
/// <returns>
/// The data bytes converted to a MidiKeySignature value, or MidiKeySignature.NA if the data could not be converted.
/// </returns>
public static MidiKeySignature DataToKeySignature(byte[] bytes)
{
int n = Midi.ReadNumber(bytes, 0, bytes.Length);
return(Enum.IsDefined(typeof(MidiKeySignature), n) ? (MidiKeySignature)n : MidiKeySignature.NA);
}
