private static void TriggerEvent(MidiEvent evnt, int track)
{
if (evnt is TempoMetaMidiEvent)
{
TempoMetaMidiEvent tempoEvent = (TempoMetaMidiEvent)evnt;
SetTrackTempo(track, tempoEvent.Value);
}
else if (evnt is EndOfTrackMetaMidiEvent)
{
//Loop??
_trackEventIndex[track] = 0;
}
else if (evnt is ControllerVoiceMidiEvent)
{
ControllerVoiceMidiEvent ccEvent = (ControllerVoiceMidiEvent)evnt;
OnCC(track, ccEvent.Channel, ccEvent.Number, ccEvent.Value);
}
else if (evnt is OnNoteVoiceMidiEvent)
{
OnNoteVoiceMidiEvent voiceEvent = (OnNoteVoiceMidiEvent)evnt;
OnNoteOn(track, voiceEvent.Channel, voiceEvent.Note, voiceEvent.Velocity);
}
else if (evnt is OffNoteVoiceMidiEvent)
{
OffNoteVoiceMidiEvent voiceEvent = (OffNoteVoiceMidiEvent)evnt;
OnNoteOff(track, voiceEvent.Channel, voiceEvent.Note);
}
}
public void AddTempoEvent(long time, TempoMetaMidiEvent tempoEvent)
{
if (TempoEvents.ContainsKey(time))
{
System.Diagnostics.Debug.WriteLine(string.Format("TempoEvent at time {0} already exists.", time));
return;
}
TempoEvents.Add(time, tempoEvent);
}
/// <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 SequenceNumberMetaMidiEvent.MetaId:
pos++; // skip past the 0x02
int number = ((data[pos] << 8) | data[pos + 1]);
tempEvent = new SequenceNumberMetaMidiEvent(deltaTime, number);
pos += 2; // skip read values
break;
// Text events (copyright, lyrics, etc)
case TextMetaMidiEvent.MetaId:
tempEvent = new TextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case CopyrightTextMetaMidiEvent.MetaId:
tempEvent = new CopyrightTextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case SequenceTrackNameTextMetaMidiEvent.MetaId:
tempEvent = new SequenceTrackNameTextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case InstrumentTextMetaMidiEvent.MetaId:
tempEvent = new InstrumentTextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case LyricTextMetaMidiEvent.MetaId:
tempEvent = new LyricTextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case MarkerTextMetaMidiEvent.MetaId:
tempEvent = new MarkerTextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case CuePointTextMetaMidiEvent.MetaId:
tempEvent = new CuePointTextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case ProgramNameTextMetaMidiEvent.MetaId:
tempEvent = new ProgramNameTextMetaMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
case DeviceNameTextMidiEvent.MetaId:
tempEvent = new DeviceNameTextMidiEvent(deltaTime, ReadASCIIText(data, ref pos));
break;
// Channel prefix
case ChannelPrefixMetaMidiEvent.MetaId:
pos++; // skip 0x1
tempEvent = new ChannelPrefixMetaMidiEvent(deltaTime, data[pos]);
pos++; // skip read value
break;
// Port number
case MidiPortMetaMidiEvent.MetaId:
pos++; // skip 0x1
tempEvent = new MidiPortMetaMidiEvent(deltaTime, data[pos]);
pos++; // skip read value
break;
// End of track
case EndOfTrackMetaMidiEvent.MetaId:
pos++; // skip 0x0
tempEvent = new EndOfTrackMetaMidiEvent(deltaTime);
break;
// Tempo
case TempoMetaMidiEvent.MetaId:
pos++; // skip 0x3
int tempo = ((data[pos] << 16) | data[pos + 1] << 8 | data[pos + 2]);
tempEvent = new TempoMetaMidiEvent(deltaTime, tempo);
pos += 3;
break;
// SMPTE offset
case SMPTEOffsetMetaMidiEvent.MetaId:
pos++; // skip 0x5
tempEvent = new SMPTEOffsetMetaMidiEvent(deltaTime,
data[pos], data[pos + 1], data[pos + 2], data[pos + 3], data[pos + 4]);
pos += 5;
break;
// Time signature
case TimeSignatureMetaMidiEvent.MetaId:
pos++; // skip past 0x4
tempEvent = new TimeSignatureMetaMidiEvent(deltaTime,
data[pos], data[pos + 1], data[pos + 2], data[pos + 3]);
pos += 4;
break;
// Key signature
case KeySignatureMetaMidiEvent.MetaId:
pos++; // skip past 0x2
tempEvent = new KeySignatureMetaMidiEvent(deltaTime, (Key)data[pos], (Tonality)data[pos + 1]);
pos += 2;
break;
// Proprietary
case ProprietaryMetaMidiEvent.MetaId:
// 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 ProprietaryMetaMidiEvent(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 double GetMicrosecondsPerTick(TempoMetaMidiEvent tempoEvent)
{
int microsecondsPerBeat = tempoEvent.Value; // microseconds / beat
return((double)microsecondsPerBeat / TicksPerBeatOrFrame); // returns microseconds / tick
}
