protected MidiParser()
{
ActiveNotes = new ushort[128];
HangingNotes = new NoteTimer[32];
for (int i = 0; i < HangingNotes.Length; i++)
{
HangingNotes[i] = new NoteTimer();
}
Tracks = new Track[120];
TimerRate = 0x4A0000;
_ppqn = 96;
tempo = 500000;
_psecPerTick = 5208;// 500000 / 96
_nextEvent = new EventInfo();
_nextEvent.Start = 0;
_nextEvent.Delta = 0;
_nextEvent.Event = 0;
Position = new Tracker();
}
protected abstract void ParseNextEvent(EventInfo info);
public bool JumpToTick(uint tick, bool fireEvents = false, bool stopNotes = true, bool dontSendNoteOn = false)
{
if (ActiveTrack >= NumTracks)
return false;
Debug.Assert(!_jumpingToTick); // This function is not re-entrant
_jumpingToTick = true;
Tracker currentPos = new Tracker(Position);
var currentEvent = new EventInfo(_nextEvent);
ResetTracking();
Position.PlayPos = Tracks[ActiveTrack].Position;
ParseNextEvent(_nextEvent);
if (tick > 0)
{
while (true)
{
EventInfo info = _nextEvent;
if (Position.LastEventTick + info.Delta >= tick)
{
Position.PlayTime += (int)(tick - Position.LastEventTick) * _psecPerTick;
Position.PlayTick = (int)tick;
break;
}
Position.LastEventTick += info.Delta;
Position.LastEventTime += (int)info.Delta * _psecPerTick;
Position.PlayTick = (int)Position.LastEventTick;
Position.PlayTime = Position.LastEventTime;
// Some special processing for the fast-forward case
if (info.Command == 0x9 && dontSendNoteOn)
{
// Don't send note on; doing so creates a "warble" with
// some instruments on the MT-32. Refer to patch #3117577
}
else if (info.Event == 0xFF && info.MetaType == 0x2F)
{
// End of track
// This means that we failed to find the right tick.
Position = currentPos;
_nextEvent = currentEvent;
_jumpingToTick = false;
return false;
}
else
{
ProcessEvent(info, fireEvents);
}
ParseNextEvent(_nextEvent);
}
}
if (stopNotes)
{
if (_smartJump || currentPos.PlayPos == 0)
{
AllNotesOff();
}
else
{
var targetEvent = new EventInfo(_nextEvent);
var targetPosition = new Tracker(Position);
Position = currentPos;
_nextEvent = currentEvent;
HangAllActiveNotes();
_nextEvent = targetEvent;
Position = targetPosition;
}
}
AbortParse = true;
_jumpingToTick = false;
return true;
}
bool ProcessEvent(EventInfo info, bool fireEvents = true)
{
if (info.Event == 0xF0)
{
// SysEx event
// Check for trailing 0xF7 -- if present, remove it.
if (fireEvents)
{
if (info.Data[info.Data.Length - 1] == 0xF7)
MidiDriver.SysEx(info.Data, (ushort)(info.Data.Length - 1));
else
MidiDriver.SysEx(info.Data, (ushort)info.Data.Length);
}
}
else if (info.Event == 0xFF)
{
// META event
if (info.MetaType == 0x2F)
{
// End of Track must be processed by us,
// as well as sending it to the output device.
if (_autoLoop)
{
JumpToTick(0);
ParseNextEvent(_nextEvent);
}
else
{
StopPlaying();
if (fireEvents)
MidiDriver.MetaEvent((byte)info.MetaType, info.Data, (ushort)info.Data.Length);
}
return false;
}
else if (info.MetaType == 0x51)
{
if (info.Data.Length >= 3)
{
Tempo = (info.Data[0] << 16 | info.Data[1] << 8 | info.Data[2]);
}
}
if (fireEvents)
MidiDriver.MetaEvent((byte)info.MetaType, info.Data, (ushort)info.Data.Length);
}
else
{
if (fireEvents)
SendToDriver(info.Event, info.Param1, info.Param2);
}
return true;
}
public EventInfo(EventInfo info)
{
Start = info.Start;
Delta = info.Delta;
Event = info.Event;
Param1 = info.Param1;
Param2 = info.Param2;
MetaType = info.MetaType;
Data = info.Data;
}
