/// <summary>
/// Update the data content of the message
/// This is parsed into a <code>byte[]</code> that becomes the data of
/// the MetaMessage.<br>
/// Most events treat the string as a text value and just convert
/// each character to a <code>byte</code> in the array but the
/// following message types are handled specially
/// <dl>
/// <dt>Tempo</dt>
/// <dd>an integer value with an optional "bpm" suffix. e.g. 120bpm</dd>
/// <dt>SmpteOffset</dt>
/// <dd>a string in the form <code>h:m:s:f:d</code> where<br>
/// h=hours m=minutes s=seconds f=frames d=fields<br>
/// If fewer than 5 values are given then the parser treats them as<br>
/// 1. <b>s</b><br>
/// 2. <b>m:s</b><br>
/// 3. <b>h:m:s</b><br>
/// 4. <b>h:m:s:f</b><br>
/// 5. <b>h:m:s:f:d</b><br>
/// and the unspecified values are set to zero.
/// </dd>
/// <dt>TimeSignature</dt>
/// <dd>a time signature string in the format <code>n[/d]</code> where<br>
/// n=numerator d=denominator<br>
/// If only <code>n</code> is given then <code>d</code> defaults to 4</dd>
/// <dt>KeySignature</dt>
/// <dd>one of the following key signature strings<br>
/// <b>Cb Gb Db Ab Eb Bb F C G D A E B F# C#</b/></dd>
/// <dt>SequenceNumber and SequencerSpecificEvent</dt>
/// <dd>a space-separated list of values that are parsed into
/// a <code>byte[]</code> using <code>Convert.ToByte()</code><br>
/// If any value cannot be parsed into a <code>byte</code>
/// then it is treated as zero</dd>
/// </dl
/// </summary>
/// <param name="mess">the message to update</param>
/// <param name="value">a String that represents the data for the event.<br></param>
/// <param name="ticksPerBeat">the tick resolution of the sequence</param>
public static void SetMetaData(MetaMessage mess, string value, int ticksPerBeat)
{
byte[] data;
int type = mess.GetMetaMessageType();
if (mess.IsText())
{
data = MidiHelper.GetBytes(value);
}
else if (type == (int)MidiHelper.MetaEventType.Tempo)
{
int bpm = ParseTempo(value);
data = BpmToMicroSecs(bpm);
}
else if (type == (int)MidiHelper.MetaEventType.TimeSignature)
{
data = ParseTimeSignature(value, ticksPerBeat);
}
else if (type == (int)MidiHelper.MetaEventType.KeySignature)
{
data = MidiHelper.ConvertSBytes(KeySignatures.GetKeyValues(value));
}
else if (type == (int)MidiHelper.MetaEventType.SmpteOffset)
{
data = ParseSMPTEOffset(value);
}
else
{
// treat the string as a space separated list of
// string representations of byte values
// TODO: Should handle decimal, hexadecimal and octal representations
// originally using the java.lang.Byte.decode() method
data = MidiHelper.StringToByteArray(value, " ");
}
if (data != null)
{
mess.SetMessage(type, data, data.Length);
}
}
// A good MIDI Files Specification: http://www.somascape.org/midi/tech/mfile.html
#region MetaMessage Extension Methods
/// <summary>
/// Get the values that represent the given META event.
/// The returned array consists of <ol>
/// <li>the event name as a String</li>
/// <li>the length of the event data as an Integer</li>
/// <li>the event data as a String</li>
/// </ol>
/// </summary>
/// <param name="mess">the META message to format</param>
/// <returns>the representation of the message</returns>
public static object[] GetMetaStrings(this MetaMessage mess)
{
// Some data is String some is a series of bytes others are neither
bool dumpText = false;
bool dumpBytes = false;
int type = mess.GetMetaMessageType();
byte[] data = mess.GetMetaMessageData();
// The returned Object array
// { type name, length, value string }
object[] result = { "M:", null, "" };
result[1] = data.Length;
switch (type)
{
case (int)MidiHelper.MetaEventType.SequenceNumber:
result[0] = "M:SequenceNumber";
dumpBytes = true;
break;
case (int)MidiHelper.MetaEventType.TextEvent:
result[0] = "M:TextEvent";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.CopyrightNotice:
result[0] = "M:CopyrightNotice";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.SequenceOrTrackName:
result[0] = "M:SequenceOrTrackName";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.InstrumentName:
result[0] = "M:InstrumentName";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.LyricText:
result[0] = "M:LyricText";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.MarkerText:
result[0] = "M:MarkerText";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.CuePoint:
result[0] = "M:CuePoint";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.ProgramName:
result[0] = "M:ProgramName";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.DeviceName:
result[0] = "M:DeviceName";
dumpText = true;
break;
case (int)MidiHelper.MetaEventType.SmpteOffset:
result[0] = "M:SmpteOffset";
// Hour, Minute, Second, Frame, Field
// hr mn se fr ff
result[2] = string.Format("{0:00}:{1:00}:{2:00}:{3:00}:{4:00}",
data[0] & 0x00FF,
data[1] & 0x00FF,
data[2] & 0x00FF,
data[3] & 0x00FF,
data[4] & 0x00FF);
break;
case (int)MidiHelper.MetaEventType.TimeSignature:
result[0] = "M:TimeSignature";
int nn = (data[0] & 0x00FF); // numerator
int dd = (int)(Math.Pow(2, (data[1] & 0x00FF))); // denominator
int cc = (data[2] & 0x00FF); // midiClocksPerMetronomeClick
int bb = (data[3] & 0x00FF); // notated 32nd-notes in a MIDI quarter-note
result[2] = nn + "/" + dd + ", "
+ cc + " clicks per metronome, "
+ bb + " 32nd notes per quarter-note";
break;
case (int)MidiHelper.MetaEventType.KeySignature:
result[0] = "M:KeySignature";
result[2] = KeySignatures.GetKeyName(data);
break;
case (int)MidiHelper.MetaEventType.Tempo:
result[0] = "M:Tempo";
int bpm = MicroSecsToBpm(data);
result[2] = string.Format("{0}", bpm);
break;
case (int)MidiHelper.MetaEventType.EndOfTrack:
result[0] = "M:EndOfTrack";
break;
case (int)MidiHelper.MetaEventType.SequencerSpecificEvent:
result[0] = "M:SequencerSpecificEvent";
dumpBytes = true;
break;
default:
result[0] = "M:" + type;
dumpBytes = true;
break;
}
if (dumpText)
{
result[2] = MidiHelper.GetStringWithoutNewlines(data);
}
if (dumpBytes)
{
result[2] = MidiHelper.ByteArrayToHexString(data, ",");
}
return(result);
}
/// <summary>
/// Create a C# code line for this meta event
/// </summary>
/// <param name="mess">the META message to process</param>
/// <param name="tick">the position of the event in the sequence</param>
/// <param name="ticksPerBeat">the tick resolution of the sequence</param>
/// <returns>a C# code line</returns>
public static string CreateMetaEventGeneratedCode(this MetaMessage mess, long tick, int ticksPerBeat)
{
int type = mess.GetMetaMessageType();
string typeName = MidiHelper.GetMetaString(type);
byte[] data = mess.GetMetaMessageData();
int dataLength = data.Length;
string value = "";
switch (type)
{
// First handle the text based events (0x01 - 0x09)
case (int)MidiHelper.MetaEventType.TextEvent:
case (int)MidiHelper.MetaEventType.CopyrightNotice:
case (int)MidiHelper.MetaEventType.SequenceOrTrackName:
case (int)MidiHelper.MetaEventType.InstrumentName:
case (int)MidiHelper.MetaEventType.LyricText:
case (int)MidiHelper.MetaEventType.MarkerText:
case (int)MidiHelper.MetaEventType.CuePoint:
case (int)MidiHelper.MetaEventType.ProgramName:
case (int)MidiHelper.MetaEventType.DeviceName:
string text = MidiHelper.GetString(data);
value = MidiHelper.TextString(text);
break;
// And then the special events
case (int)MidiHelper.MetaEventType.SmpteOffset:
// Hour, Minute, Second, Frame, Field
// hr mn se fr ff
value = string.Format("{0:00}:{1:00}:{2:00}:{3:00}:{4:00}",
data[0] & 0x00FF,
data[1] & 0x00FF,
data[2] & 0x00FF,
data[3] & 0x00FF,
data[4] & 0x00FF);
break;
case (int)MidiHelper.MetaEventType.TimeSignature:
int nn = (data[0] & 0x00FF); // numerator
int dd = (int)(Math.Pow(2, (data[1] & 0x00FF))); // denominator
int cc = (data[2] & 0x00FF); // midiClocksPerMetronomeClick
int bb = (data[3] & 0x00FF); // notated 32nd-notes in a MIDI quarter-note
value = nn + "/" + dd;
break;
case (int)MidiHelper.MetaEventType.KeySignature:
value = KeySignatures.GetKeyName(data);
break;
case (int)MidiHelper.MetaEventType.Tempo:
int bpm = MicroSecsToBpm(data);
value = string.Format("{0}", bpm);
break;
case (int)MidiHelper.MetaEventType.EndOfTrack:
break;
default:
value = MidiHelper.ByteArrayToString(data, " ");
break;
}
return(string.Format("MetaEvent.CreateMetaEvent((int) MidiHelper.MetaEventType.{0}, \"{1}\", {2}, {3})", typeName, value, tick, ticksPerBeat));
}
