public void addTempo(Tempo tempo)
{
//insert the tempo into the tempo list
int pos = 0;
if (tempo.tick > tempos[tempos.Count - 1].tick) //if tempo goes at end of list
{
tempos.Add(tempo);
pos = tempos.Count - 1;
}
else
{
while ((pos < tempos.Count) && (tempo.tick > tempos[pos].tick))
{
pos++;
}
if (tempo.tick == tempos[pos].tick) //if we already have a temp change at this tick, replace it
{
tempos[pos] = tempo;
}
else
{
tempos.Insert(pos, tempo); //else insert new tempo change into list at this pos
}
}
count = tempos.Count;
calcTempoMap(pos);
}
public TempoMap(Sequence _seq)
{
seq = _seq;
tempos = new List <Tempo>();
Tempo tempo = new Tempo(0, DEFAULTTEMPO);
tempos.Add(tempo);
count = 1;
}
public void calcTempoMap(int pos) //calc time of each tempo change from this tempo to tempo list end
{
for (int i = pos; i < tempos.Count; i++)
{
if (i == 0)
{
tempos[i].time = 0;
}
else
{
Tempo prev = tempos[i - 1];
int delta = tempos[i].tick - prev.tick; //amount of ticks from prev tempo to this one
double deltatime = (((double)delta) / seq.division) * prev.rate;
tempos[i].time = prev.time + (int)deltatime; //calc time in microsec of this tempo event
}
}
}
//build the tempo, meter and marker maps from tempo message from track 0
private static void loadTrackZeroData(MidiInStream stream, Sequence seq)
{
//read track header
String trackSig = stream.getString(4);
uint trackDataLength = stream.getFour();
if (!trackSig.Equals("MTrk"))
{
throw new MidiFileException(stream.filename + " has an invalid track 0 at ", stream.getDataPos() - 8);
}
int currentTime = 0; //event time in ticks
runningStatus = 0;
sysexCont = false;
prevSysEx = null;
Event evt;
Meter prevMeter = null;
int startpos = stream.getDataPos();
while ((stream.getDataPos() - startpos) < trackDataLength)
{
currentTime += (int)stream.getVariableLengthVal(); //add delta time to current num of ticks
evt = loadEventData(stream);
if (evt is TempoEvent)
{
Tempo tempo = new Tempo(currentTime, ((TempoEvent)evt).tempo);
seq.tempoMap.addTempo(tempo);
}
else if (evt is SMPTEOffsetEvent) //not handling smpte timing yet
{
}
else if (evt is TimeSignatureEvent)
{
int keysig = (prevMeter != null) ? prevMeter.keysig : 0;
Meter meter = new Meter(currentTime, ((TimeSignatureEvent)evt).numer, ((TimeSignatureEvent)evt).denom, keysig);
seq.meterMap.addMeter(meter);
prevMeter = meter;
}
else if (evt is KeySignatureEvent)
{
int numer = 4;
int denom = 4;
if (prevMeter != null)
{
numer = prevMeter.numer;
denom = prevMeter.denom;
}
Meter meter = new Meter(currentTime, numer, denom, ((KeySignatureEvent)evt).keySig);
seq.meterMap.addMeter(meter);
prevMeter = meter;
}
else if (evt is MarkerEvent)
{
}
else if (evt is CuePointEvent)
{
}
}
}
