/// <summary>
/// Create a Midi Short event
/// </summary>
/// <param name="status">the status byte for this message</param>
/// <param name="channel">the midi channel (0 - 15)</param>
/// <param name="d1">the first data byte for this message</param>
/// <param name="d2">the second data byte for this message</param>
/// <param name="tick">the position of the event in the sequence</param>
/// <returns>the created Midi Short event</returns>
public static MidiEvent CreateShortEvent(int status, int channel, int d1, int d2, long tick)
{
var sm = new ShortMessage();
sm.SetMessage(status, channel, d1, d2);
var ev = new MidiEvent(sm, tick);
return(ev);
}
/// <summary>
/// Create a Midi Short event
/// </summary>
/// <param name="status">the status byte of the Short event</param>
/// <param name="tick">the position of the event in the sequence</param>
/// <returns>the created Midi Short event</returns>
public static MidiEvent CreateShortEvent(int status, long tick)
{
var sm = new ShortMessage();
sm.SetMessage(status);
var ev = new MidiEvent(sm, tick);
return(ev);
}
/// <summary>
/// Get the MIDI Sequence found in this input stream.
/// <see cref="gnu.sound.midi.spi.MidiFileReader#GetSequence(Stream)"/>
/// </summary>
public override Sequence GetSequence(Stream stream)
{
// Good midi spec:
// http://www.somascape.org/midi/tech/mfile.html
// http://www.ccarh.org/courses/253/handout/smf/
var din = new MidiDataInputStream(stream);
var mff = (ExtendedMidiFileFormat)GetMidiFileFormat(din.BaseStream);
var seq = new Sequence(mff.DivisionType, mff.Resolution, 0, mff.MidiFileType);
int ntracks = mff.NumberOfTracks;
while (ntracks-- > 0)
{
Track track = seq.CreateTrack();
int Mtrk = din.ReadInt32();
if (Mtrk != 0x4D54726B) // "MTrk"
{
throw new InvalidMidiDataException("Invalid MIDI track header.");
}
int length = din.ReadInt32();
int runningStatus = -1;
int click = 0;
// Set this to true when we've hit an End of Track meta event.
bool done = false;
// Read all events.
while (!done)
{
MidiMessage mm;
int deltaTime = din.ReadVariableLengthInt();
click += deltaTime;
// in Java bytes are signed (-128, +127)
// where in C# it's not (0, 255).
int statusByte = din.ReadByte();
if (statusByte < (int)MidiHelper.MidiEventType.SystemExclusive)
{
ShortMessage shortMessage;
switch (statusByte & 0xF0)
{
case (int)MidiHelper.MidiEventType.NoteOff:
case (int)MidiHelper.MidiEventType.NoteOn:
case (int)MidiHelper.MidiEventType.AfterTouchPoly:
case (int)MidiHelper.MidiEventType.ControlChange:
case (int)MidiHelper.MidiEventType.PitchBend:
case (int)MidiHelper.MidiEventType.SongPosition:
shortMessage = new ShortMessage();
shortMessage.SetMessage(statusByte, din.ReadByte(), din.ReadByte());
runningStatus = statusByte;
break;
case (int)MidiHelper.MidiEventType.ProgramChange:
case (int)MidiHelper.MidiEventType.AfterTouchChannel:
case (int)MidiHelper.MidiEventType.SongSelect:
case (int)MidiHelper.MidiEventType.BusSelect:
shortMessage = new ShortMessage();
shortMessage.SetMessage(statusByte, din.ReadByte(), 0);
runningStatus = statusByte;
break;
case (int)MidiHelper.MidiEventType.TuneRequest:
case (int)MidiHelper.MidiEventType.EndOfExclusive:
case (int)MidiHelper.MidiEventType.Clock:
case (int)MidiHelper.MidiEventType.Start:
case (int)MidiHelper.MidiEventType.Continue:
case (int)MidiHelper.MidiEventType.Stop:
case (int)MidiHelper.MidiEventType.ActiveSensing:
case (int)MidiHelper.MidiEventType.SystemReset:
shortMessage = new ShortMessage();
shortMessage.SetMessage(statusByte, 0, 0);
runningStatus = statusByte;
break;
default:
if (runningStatus != -1)
{
switch (runningStatus & 0xF0)
{
case (int)MidiHelper.MidiEventType.NoteOff:
case (int)MidiHelper.MidiEventType.NoteOn:
case (int)MidiHelper.MidiEventType.AfterTouchPoly:
case (int)MidiHelper.MidiEventType.ControlChange:
case (int)MidiHelper.MidiEventType.PitchBend:
case (int)MidiHelper.MidiEventType.SongPosition:
shortMessage = new ShortMessage();
shortMessage.SetMessage(runningStatus, statusByte, din.ReadByte());
break;
case (int)MidiHelper.MidiEventType.ProgramChange:
case (int)MidiHelper.MidiEventType.AfterTouchChannel:
case (int)MidiHelper.MidiEventType.SongSelect:
case (int)MidiHelper.MidiEventType.BusSelect:
shortMessage = new ShortMessage();
shortMessage.SetMessage(runningStatus, statusByte, 0);
continue;
case (int)MidiHelper.MidiEventType.TuneRequest:
case (int)MidiHelper.MidiEventType.EndOfExclusive:
case (int)MidiHelper.MidiEventType.Clock:
case (int)MidiHelper.MidiEventType.Start:
case (int)MidiHelper.MidiEventType.Continue:
case (int)MidiHelper.MidiEventType.Stop:
case (int)MidiHelper.MidiEventType.ActiveSensing:
case (int)MidiHelper.MidiEventType.SystemReset:
shortMessage = new ShortMessage();
shortMessage.SetMessage(runningStatus, 0, 0);
continue;
default:
throw new InvalidMidiDataException("Invalid Short MIDI Event: " + statusByte);
}
}
else
{
throw new InvalidMidiDataException("Invalid Short MIDI Event: " + statusByte);
}
break;
}
mm = shortMessage;
}
else if (statusByte == (int)MidiHelper.MidiEventType.SystemExclusive ||
statusByte == (int)MidiHelper.MidiEventType.EndOfExclusive)
{
// System Exclusive event
int sysexLength = din.ReadVariableLengthInt();
var sysexData = din.ReadBytes(sysexLength);
var sysexMessage = new SysexMessage();
sysexMessage.SetMessage(statusByte, sysexData, sysexLength);
mm = sysexMessage;
runningStatus = -1;
}
else if (statusByte == (int)MidiHelper.META)
{
// Meta Message
byte metaType = din.ReadByte();
int metaLength = din.ReadVariableLengthInt();
var metaData = din.ReadBytes(metaLength);
var metaMessage = new MetaMessage();
metaMessage.SetMessage(metaType, metaData, metaLength);
mm = metaMessage;
// End of Track
if (metaType == (byte)MidiHelper.MetaEventType.EndOfTrack)
{
done = true;
}
runningStatus = -1;
}
else
{
throw new InvalidMidiDataException("Invalid status byte: " + statusByte);
}
track.Add(new MidiEvent(mm, click));
}
}
return(seq);
}