private void Decode(byte[] message)
{
byte status = message[0];
switch (status & 0b1111_0000)
{
case Midi.Status.NoteOffBitmask:
if (NoteOffMessage.TryDecode(message, out var noteOffMessage))
{
NoteOff?.Invoke(this, in noteOffMessage);
}
break;
case Midi.Status.NoteOnBitmask:
if (NoteOnMessage.TryDecoce(message, out var noteOnMessage))
{
NoteOn?.Invoke(this, in noteOnMessage);
}
break;
case Midi.Status.PolyphonicKeyPressureBitmask:
if (PolyphonicKeyPressureMessage.TryDecode(message, out var polyphonicKeyPressureMessage))
{
PolyphonicKeyPressure?.Invoke(this, in polyphonicKeyPressureMessage);
}
break;
case Midi.Status.ControlChangeBitmask:
if (ControlChangeMessage.TryDecode(message, out var controlChangeMessage))
{
_nrpnInterpreters[(int)controlChangeMessage.Channel].HandleControlChangeMessage(in controlChangeMessage);
}
break;
case Midi.Status.ProgramChangeBitmask:
if (ProgramChangeMessage.TryDecode(message, out var programChangeMessage))
{
ProgramChange?.Invoke(this, in programChangeMessage);
}
break;
case Midi.Status.ChannelPressureBitmask:
if (ChannelPressureMessage.TryDecode(message, out var channelPressureMessage))
{
ChannelPressure?.Invoke(this, in channelPressureMessage);
}
break;
case Midi.Status.PitchBendChange:
if (PitchBendMessage.TryDecode(message, out var pitchBendMessage))
{
PitchBend?.Invoke(this, in pitchBendMessage);
}
break;
default:
Log.Error("Unknown message type {Bitmask}", $"{status & 0b1111_0000:X2}");
break;
}
}
private TrackEvent ReadTrackEvent()
{
var deltaTime = ReadVariableLengthEncoding();
// "Running Status": The last status byte is implied
var statusByte = _lastStatusByte;
var firstByte = _source.ReadByte();
// Check for new status byte
if ((firstByte & 0x80) == 1)
{
statusByte = firstByte;
firstByte = _source.ReadByte();
}
var statusUpper = statusByte >> 4;
// Save running status
if (statusUpper > 0x7 && statusUpper < 0xF)
{
_lastStatusByte = statusByte;
}
// Parse the event
var statusLower = (byte)(statusByte & 0xF);
MidiEvent ev = null;
switch (statusUpper)
{
case 0x8:
ev = new NoteOff(statusLower, firstByte, _source.ReadByte());
break;
case 0x9:
ev = new NoteOn(statusLower, firstByte, _source.ReadByte());
break;
case 0xA:
ev = new PolyphonicKeyPressure(statusLower, firstByte, _source.ReadByte());
break;
case 0xB:
if (firstByte < 120)
{
ev = new ControlChange(statusLower, firstByte, _source.ReadByte());
}
else
{
ev = new ChannelMode(statusLower, firstByte, _source.ReadByte());
}
break;
case 0xC:
ev = new ProgramChange(statusLower, firstByte);
break;
case 0xD:
ev = new ChannelPressure(statusLower, firstByte);
break;
case 0xE:
ev = new PitchBend(statusLower, firstByte, _source.ReadByte());
break;
case 0xF:
switch (statusLower)
{
case 0x0:
case 0x7:
ev = new SysEx(statusLower == 0, _source.ReadBytes(ReadVariableLengthEncoding(firstByte)));
break;
case 0xF:
var len = ReadVariableLengthEncoding();
var data = _source.ReadBytes(len);
switch (firstByte)
{
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x08:
case 0x09:
case 0x0A:
case 0x0B:
case 0x0C:
case 0x0D:
case 0x0E:
case 0x0F:
ev = new TextEvent(Encoding.UTF8.GetString(data)); // TODO: Let user choose encoding
break;
case 0x20:
ev = new ChannelPrefix(data[0]);
break;
case 0x2F:
ev = new EndOfTrack();
break;
case 0x51:
ev = new SetTempo(MidiBytesConverter.ReadBigEndian24Bit(data));
break;
case 0x54:
ev = new SmpteOffset((byte)((data[0] >> 5) & 0x3), (byte)(data[0] & 0x1F), data[1], data[2], data[3], data[4]);
break;
case 0x58:
ev = new TimeSignature(data[0], data[1], data[2], data[3]);
break;
case 0x59:
ev = new KeySignature((sbyte)data[0], data[1] == 1);
break;
case 0x7F:
ev = new SequencerSpecificMetaEvent(data);
break;
default:
// TODO: Unrecognized metadata kind, non-fatal error
break;
}
break;
default:
// At this point, if the event was not recognized: FATAL ERROR!
throw new NotImplementedException();
}
break;
default:
// At this point, if the event was not recognized: FATAL ERROR!
throw new NotImplementedException();
}
return(new TrackEvent(deltaTime, ev));
}
private void Decode(byte[] message)
{
byte status = message[0];
switch (status & 0b1111_0000)
{
case Midi.Status.NoteOffBitmask:
if (NoteOffMessage.TryDecode(message, out var noteOffMessage))
{
NoteOff?.Invoke(this, in noteOffMessage);
}
break;
case Midi.Status.NoteOnBitmask:
if (NoteOnMessage.TryDecode(message, out var noteOnMessage))
{
NoteOn?.Invoke(this, in noteOnMessage);
}
break;
case Midi.Status.PolyphonicKeyPressureBitmask:
if (PolyphonicKeyPressureMessage.TryDecode(message, out var polyphonicKeyPressureMessage))
{
PolyphonicKeyPressure?.Invoke(this, in polyphonicKeyPressureMessage);
}
break;
case Midi.Status.ControlChangeBitmask:
if (ControlChangeMessage.TryDecode(message, out var controlChangeMessage))
{
_nrpnInterpreters[(int)controlChangeMessage.Channel].HandleControlChangeMessage(in controlChangeMessage);
}
break;
case Midi.Status.ProgramChangeBitmask:
if (ProgramChangeMessage.TryDecode(message, out var programChangeMessage))
{
ProgramChange?.Invoke(this, in programChangeMessage);
}
break;
case Midi.Status.ChannelPressureBitmask:
if (ChannelPressureMessage.TryDecode(message, out var channelPressureMessage))
{
ChannelPressure?.Invoke(this, in channelPressureMessage);
}
break;
case Midi.Status.PitchBendChange:
if (PitchBendMessage.TryDecode(message, out var pitchBendMessage))
{
PitchBend?.Invoke(this, in pitchBendMessage);
}
break;
case Midi.Status.System:
switch (status)
{
case Midi.Status.SysExStart:
if (SysExMessage.TryDecode(message, out var sysExMessage))
{
SysEx?.Invoke(this, in sysExMessage);
}
break;
case Midi.Status.MidiTimeCodeQuarterFrame:
if (MidiTimeCodeQuarterFrameMessage.TryDecode(message, out var timeCodeQuarterFrameMessage))
{
MidiTimeCodeQuarterFrame?.Invoke(this, in timeCodeQuarterFrameMessage);
}
break;
case Midi.Status.SongPositionPointer:
if (SongPositionPointerMessage.TryDecode(message, out var songPositionPointerMessage))
{
SongPositionPointer?.Invoke(this, in songPositionPointerMessage);
}
break;
case Midi.Status.SongSelect:
if (SongSelectMessage.TryDecode(message, out var songSelectMessage))
{
SongSelect?.Invoke(this, in songSelectMessage);
}
break;
case Midi.Status.TuneRequest:
if (TuneRequestMessage.TryDecode(message, out var tuneRequestMessage))
{
TuneRequest?.Invoke(this, in tuneRequestMessage);
}
break;
default:
Log.Error("Unknown system message type {Status}", $"{status:X2}");
break;
}
break;
default:
Log.Error("Unknown message type {Bitmask}", $"{status & 0b1111_0000:X2}");
break;
}
}