/// <summary>Parse a meta MIDI event from the data stream.</summary>
/// <param name="deltaTime">The previously parsed delta-time for this event.</param>
/// <param name="eventType">The previously parsed type of message we're expecting to find.</param>
/// <param name="data">The data stream from which to read the event information.</param>
/// <param name="pos">The position of the start of the event information.</param>
/// <returns>The parsed meta MIDI event.</returns>
private static MidiEvent ParseMetaEvent(long deltaTime, byte eventType, byte [] data, ref long pos)
{
try
{
MidiEvent tempEvent = null;
// Create the correct meta event based on its meta event id/type
switch(eventType)
{
// Sequence number
case 0x00:
pos++; // skip past the 0x02
int number = ((data[pos] << 8) | data[pos+1]);
tempEvent = new SequenceNumber(deltaTime, number);
pos += 2; // skip read values
break;
// Text events (copyright, lyrics, etc)
case 0x01: tempEvent = new Text(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x02: tempEvent = new Copyright(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x03: tempEvent = new SequenceTrackName(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x04: tempEvent = new Instrument(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x05: tempEvent = new Lyric(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x06: tempEvent = new Marker(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x07: tempEvent = new CuePoint(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x08: tempEvent = new ProgramName(deltaTime, ReadASCIIText(data, ref pos)); break;
case 0x09: tempEvent = new DeviceName(deltaTime, ReadASCIIText(data, ref pos)); break;
// Channel prefix
case 0x20:
pos++; // skip 0x1
tempEvent = new ChannelPrefix(deltaTime, data[pos]);
pos++; // skip read value
break;
// Port number
case 0x21:
pos++; // skip 0x1
tempEvent = new MidiPort(deltaTime, data[pos]);
pos++; // skip read value
break;
// End of track
case 0x2F:
pos++; // skip 0x0
tempEvent = new EndOfTrack(deltaTime);
break;
// Tempo
case 0x51:
pos++; // skip 0x3
int tempo = ((data[pos] << 16) | data[pos+1] << 8 | data[pos+2]);
tempEvent = new Tempo(deltaTime, tempo);
pos += 3;
break;
// SMPTE offset
case 0x54:
pos++; // skip 0x5
tempEvent = new SMPTEOffset(deltaTime,
data[pos], data[pos+1], data[pos+2], data[pos+3], data[pos+4]);
pos += 5;
break;
// Time signature
case 0x58:
pos++; // skip past 0x4
tempEvent = new TimeSignature(deltaTime,
data[pos], data[pos+1], data[pos+2], data[pos+3]);
pos += 4;
break;
// Key signature
case 0x59:
pos++; // skip past 0x2
tempEvent = new KeySignature(deltaTime, (Key)data[pos], (Tonality)data[pos+1]);
pos += 2;
break;
// Proprietary
case 0x7F:
// Read in the variable length and that much data, then store it
long length = ReadVariableLength(data, ref pos);
byte [] propData = new byte[length];
Array.Copy(data, (int)pos, propData, 0, (int)length);
tempEvent = new Proprietary(deltaTime, propData);
pos += length;
break;
// An unknown meta event!
default:
// Read in the variable length and that much data, then store it
length = ReadVariableLength(data, ref pos);
byte [] unknownData = new byte[length];
Array.Copy(data, (int)pos, unknownData, 0, (int)length);
tempEvent = new UnknownMetaMidiEvent(deltaTime, eventType, unknownData);
pos += length;
break;
}
return tempEvent;
}
// Something bad happened; wrap it in a parser exception
catch(Exception exc) { throw new MidiParserException("Unable to parse meta MIDI event.", exc, pos); }
}
private static MidiEvent ParseMetaEvent(long deltaTime, byte eventType, byte[] data, ref long pos)
{
MidiEvent event3;
try
{
long num3;
MidiEvent event2 = null;
switch (eventType)
{
case 0:
{
pos += 1L;
int number = (data[(int) ((IntPtr) pos)] << 8) | data[(int) ((IntPtr) (pos + 1L))];
event2 = new SequenceNumber(deltaTime, number);
pos += 2L;
break;
}
case 1:
event2 = new Text(deltaTime, ReadASCIIText(data, ref pos));
break;
case 2:
event2 = new Copyright(deltaTime, ReadASCIIText(data, ref pos));
break;
case 3:
event2 = new SequenceTrackName(deltaTime, ReadASCIIText(data, ref pos));
break;
case 4:
event2 = new Instrument(deltaTime, ReadASCIIText(data, ref pos));
break;
case 5:
event2 = new Lyric(deltaTime, ReadASCIIText(data, ref pos));
break;
case 6:
event2 = new Marker(deltaTime, ReadASCIIText(data, ref pos));
break;
case 7:
event2 = new CuePoint(deltaTime, ReadASCIIText(data, ref pos));
break;
case 8:
event2 = new ProgramName(deltaTime, ReadASCIIText(data, ref pos));
break;
case 9:
event2 = new DeviceName(deltaTime, ReadASCIIText(data, ref pos));
break;
case 0x20:
pos += 1L;
event2 = new ChannelPrefix(deltaTime, data[(int) ((IntPtr) pos)]);
pos += 1L;
break;
case 0x21:
pos += 1L;
event2 = new MidiPort(deltaTime, data[(int) ((IntPtr) pos)]);
pos += 1L;
break;
case 0x2f:
pos += 1L;
event2 = new EndOfTrack(deltaTime);
break;
case 0x58:
pos += 1L;
event2 = new TimeSignature(deltaTime, data[(int) ((IntPtr) pos)], data[(int) ((IntPtr) (pos + 1L))], data[(int) ((IntPtr) (pos + 2L))], data[(int) ((IntPtr) (pos + 3L))]);
pos += 4L;
break;
case 0x59:
pos += 1L;
event2 = new KeySignature(deltaTime, (Key) data[(int) ((IntPtr) pos)], (Tonality) data[(int) ((IntPtr) (pos + 1L))]);
pos += 2L;
break;
case 0x7f:
{
num3 = ReadVariableLength(data, ref pos);
byte[] destinationArray = new byte[num3];
Array.Copy(data, (int) pos, destinationArray, 0, (int) num3);
event2 = new Proprietary(deltaTime, destinationArray);
pos += num3;
break;
}
case 0x51:
{
pos += 1L;
int num2 = ((data[(int) ((IntPtr) pos)] << 0x10) | (data[(int) ((IntPtr) (pos + 1L))] << 8)) | data[(int) ((IntPtr) (pos + 2L))];
event2 = new Tempo(deltaTime, num2);
pos += 3L;
break;
}
case 0x54:
pos += 1L;
event2 = new SMPTEOffset(deltaTime, data[(int) ((IntPtr) pos)], data[(int) ((IntPtr) (pos + 1L))], data[(int) ((IntPtr) (pos + 2L))], data[(int) ((IntPtr) (pos + 3L))], data[(int) ((IntPtr) (pos + 4L))]);
pos += 5L;
break;
default:
{
num3 = ReadVariableLength(data, ref pos);
byte[] buffer2 = new byte[num3];
Array.Copy(data, (int) pos, buffer2, 0, (int) num3);
event2 = new UnknownMetaMidiEvent(deltaTime, eventType, buffer2);
pos += num3;
break;
}
}
event3 = event2;
}
catch (Exception exception)
{
throw new MidiParserException("Unable to parse meta MIDI event.", exception, pos);
}
return event3;
}