/* sweep the tempo to a new value relative to the current value */
public static void TempoControlSweepToAdjustedValue(
TempoControlRec Tempo,
LargeBCDType AdjustBPM,
SmallExtBCDType NumBeatsToReach)
{
TempoControlSweepHelper(
Tempo,
Tempo.CurrentBeatsPerMinute + (double)AdjustBPM,
NumBeatsToReach);
}
/* sweep the tempo to a new value */
public static void TempoControlSweepToNewValue(
TempoControlRec Tempo,
LargeBCDType NewBPM,
SmallExtBCDType NumBeatsToReach)
{
TempoControlSweepHelper(
Tempo,
(double)NewBPM,
NumBeatsToReach);
}
/* set the tempo to the specified number of beats per minute */
public static void TempoControlSetBeatsPerMinute(
TempoControlRec Tempo,
LargeBCDType NewBeatsPerMinute)
{
Tempo.CurrentBeatsPerMinute = (double)NewBeatsPerMinute;
if (Tempo.CurrentBeatsPerMinute < MINBPM)
{
Tempo.CurrentBeatsPerMinute = MINBPM;
}
Tempo.BeatsPerMinuteChangeCountdown = 0;
}
/* adjust the tempo by adding the specified value to it */
public static void TempoControlAdjustBeatsPerMinute(
TempoControlRec Tempo,
LargeBCDType IncrementBeatsPerMinute)
{
Tempo.CurrentBeatsPerMinute += (double)IncrementBeatsPerMinute;
if (Tempo.CurrentBeatsPerMinute < MINBPM)
{
Tempo.CurrentBeatsPerMinute = MINBPM;
}
Tempo.BeatsPerMinuteChangeCountdown = 0;
}
/* create a new tempo control record */
public static TempoControlRec NewTempoControl(LargeBCDType DefaultBeatsPerMinute)
{
#if DEBUG
Debug.Assert(DURATIONUPDATECLOCKRESOLUTION == Constants.Denominator);
#endif
TempoControlRec Tempo = new TempoControlRec();
Tempo.DefaultBeatsPerMinute = (double)DefaultBeatsPerMinute;
Tempo.CurrentBeatsPerMinute = Tempo.DefaultBeatsPerMinute;
ResetLinearTransition(ref Tempo.BeatsPerMinuteChange, 0, 0, 1);
Tempo.BeatsPerMinuteChangeCountdown = 0;
return(Tempo);
}
/* update the tempo control & return the new value */
public static double TempoControlUpdate(
TempoControlRec Tempo,
int NumTicks)
{
int RunoutTicks = NumTicks;
if (RunoutTicks > Tempo.BeatsPerMinuteChangeCountdown)
{
RunoutTicks = Tempo.BeatsPerMinuteChangeCountdown;
}
if (RunoutTicks > 0)
{
Tempo.CurrentBeatsPerMinute = LinearTransitionUpdateMultiple(
ref Tempo.BeatsPerMinuteChange,
RunoutTicks);
Tempo.BeatsPerMinuteChangeCountdown -= RunoutTicks;
}
return(Tempo.CurrentBeatsPerMinute);
}
/* helper for sweeping to new double-precision value */
private static void TempoControlSweepHelper(
TempoControlRec Tempo,
double dNewBPM,
SmallExtBCDType NumBeatsToReach)
{
if (dNewBPM < MINBPM)
{
dNewBPM = MINBPM;
}
double LocalNumBeatsToReach = (double)NumBeatsToReach;
if (LocalNumBeatsToReach < 0)
{
LocalNumBeatsToReach = 0;
}
Tempo.BeatsPerMinuteChangeCountdown = (int)(LocalNumBeatsToReach * (DURATIONUPDATECLOCKRESOLUTION / 4));
ResetLinearTransition(
ref Tempo.BeatsPerMinuteChange,
Tempo.CurrentBeatsPerMinute,
dNewBPM,
Tempo.BeatsPerMinuteChangeCountdown);
}
/* reset tempo to default value */
public static void TempoControlRestoreDefault(TempoControlRec Tempo)
{
Tempo.CurrentBeatsPerMinute = Tempo.DefaultBeatsPerMinute;
Tempo.BeatsPerMinuteChangeCountdown = 0;
}
