/* quantize the start time */
private static void QuantizeStartTime(
int StartTime,
int QuarterNoteLen,
NoteFlags QuantizedDuration,
double QuantizedDurationAdjust,
out FractionRec StartTimeOut,
out double StartTimeAdjustOut,
out double WholeNoteStartTimeAdjust)
{
uint Denominator;
double QuantizedStartTime;
double OrigDuration;
FractionRec OrigDurationFractional;
/* start times must be a multiple of the 64th note. see rationale */
/* in comment at top of this file. */
Denominator = 64;
NoteNoteObjectRec.ConvertDurationFrac(QuantizedDuration, out OrigDurationFractional);
OrigDuration = (4 * QuarterNoteLen) * QuantizedDurationAdjust
* FractionRec.Fraction2Double(OrigDurationFractional);
/* compute start time to nearest division they allow */
FractionRec.Double2Fraction(StartTime / (double)(QuarterNoteLen * 4), Denominator, out StartTimeOut);
/* set start time adjust (relative to duration) */
QuantizedStartTime = FractionRec.Fraction2Double(StartTimeOut) * (4 * QuarterNoteLen);
StartTimeAdjustOut = (QuantizedStartTime - StartTime) / OrigDuration;
WholeNoteStartTimeAdjust = (QuantizedStartTime - StartTime) / (4 * QuarterNoteLen);
}
/* convert fraction to a double */
public static double Fraction2Double(FractionRec Fraction)
{
if (Fraction.Fraction >= Fraction.Denominator)
{
// numerator is larger than denominator
Debug.Assert(false);
throw new ArgumentException();
}
return(Fraction.Integer + ((double)Fraction.Fraction / Fraction.Denominator));
}
/* get comment event information. *MessageActualOut is the actual heap block. */
/* fields may be NIL if value is not needed */
public static void GetQuantizedCommentEventInfo(
QuantEventRec Event,
out FractionRec StartTimeOut,
out double StartTimeAdjustOut,
out string CommentStringOut)
{
Debug.Assert(Event.Type == QuantEventType.eQuantizedCommentEvent);
StartTimeOut = Event.StartTime;
StartTimeAdjustOut = Event.StartTimeAdjust;
CommentStringOut = Event.CommentString;
}
/* create new interval comment. comment string is a heap allocated */
/* non-null-terminated string; onwership of string goes to the object */
public static QuantEventRec NewQuantizedCommentEvent(
FractionRec StartTime,
double StartTimeAdjust,
string CommentString)
{
QuantEventRec Event = new QuantEventRec();
Event.Type = QuantEventType.eQuantizedCommentEvent;
Event.StartTime = StartTime;
Event.StartTimeAdjust = StartTimeAdjust;
Event.CommentString = CommentString;
return(Event);
}
/* determine if fraction is an integer multiple of a 64th div3 */
public static bool FractionIntMultOf64thDiv3(FractionRec Fraction)
{
FractionRec SixtyFourthDiv3;
FractionRec SixtyFourthDiv3Reciprocal;
FractionRec Product;
NoteNoteObjectRec.ConvertDurationFrac(NoteFlags.e64thNote | NoteFlags.eDiv3Modifier, out SixtyFourthDiv3);
Debug.Assert((SixtyFourthDiv3.Integer == 0) && (SixtyFourthDiv3.Fraction != 0)); // "cute problem"
FractionRec.MakeFraction(out SixtyFourthDiv3Reciprocal, 0, (int)SixtyFourthDiv3.Denominator,
(int)SixtyFourthDiv3.Fraction); /* reciprocal */
FractionRec.MultFractions(Fraction, SixtyFourthDiv3Reciprocal, out Product);
/* if fraction == 0 then it is an even multiple of the 64th note */
return(Product.Fraction == 0);
}
/* reduce fraction */
public static void ReduceFraction(ref FractionRec Frac)
{
if (Frac.Fraction >= Frac.Denominator)
{
// numerator is larger than denominator
Debug.Assert(false);
throw new ArgumentException();
}
uint GCF = FindCommonFactors(Frac.Fraction, Frac.Denominator);
Frac.Fraction = Frac.Fraction / GCF;
Frac.Denominator = Frac.Denominator / GCF;
}
/* convert a decimal number to a fraction with the specified denominator limit */
public static void Double2Fraction(double Value, uint Denominator, out FractionRec Fraction)
{
if (Value < 0)
{
Debug.Assert(false);
throw new ArgumentException();
}
/* add half so that truncation results in value rounded to nearest denominator */
Value = Value + (double)0.5 / Denominator;
uint Integer = (uint)Value;
Fraction = new FractionRec(Integer, (uint)((Value - Integer) * Denominator), Denominator);
ReduceFraction(ref Fraction);
}
/* test to see if the left is greater than or equal to the right */
public static bool FracGreaterEqual(FractionRec Left, FractionRec Right)
{
if ((Left.Fraction >= Left.Denominator) || (Right.Fraction >= Right.Denominator))
{
// numerator is larger than denominator
Debug.Assert(false);
throw new ArgumentException();
}
if (Left.Integer > Right.Integer)
{
/* if the integer portion is bigger, then there's no contest */
return(true);
}
else if (Left.Integer < Right.Integer)
{
/* same as above */
return(false);
}
else
{
/* if the integer portions are the same, then we have to compare the */
/* fractional portions */
if (Left.Denominator == Right.Denominator)
{
/* if the denominators are the same, then comparison is easy */
return(Left.Fraction >= Right.Fraction);
}
else
{
uint GCF;
/* if the denominators are not the same, then they have to be */
/* made the same. as before, the GCF is the factors that are */
/* common to both sides. Left->Denominator / GCF is the portion of */
/* the left that right needs and Right->Denominator / GCF is the portion */
/* of the right that left needs. We don't care about the new */
/* denominator, but we will compare the new numerators. */
GCF = FindCommonFactors(Left.Denominator, Right.Denominator);
return(Left.Fraction * (Right.Denominator / GCF)
>= Right.Fraction * (Left.Denominator / GCF));
}
}
}
/* get note event information. fields may be NIL if value is not needed */
public static void GetQuantizedNoteEventInfo(
QuantEventRec Event,
out FractionRec StartTimeOut,
out double StartTimeAdjustOut,
out NoteFlags DurationOut,
out double DurationAdjustOut,
out short MIDIPitchOut,
out short MIDIAttackVelocityOut,
out short MIDIReleaseVelocityOut)
{
Debug.Assert(Event.Type == QuantEventType.eQuantizedNoteEvent);
StartTimeOut = Event.StartTime;
StartTimeAdjustOut = Event.StartTimeAdjust;
DurationOut = Event.Duration;
DurationAdjustOut = Event.DurationAdjust;
MIDIPitchOut = Event.MIDIPitch;
MIDIAttackVelocityOut = Event.MIDIAttackVelocity;
MIDIReleaseVelocityOut = Event.MIDIReleaseVelocity;
}
/* insert new event sorted into the track */
public static void QuantizedTrackInsertEventSorted(
QuantizedTrackRec Track,
QuantEventRec Event)
{
FractionRec OurEventStartTime = GetQuantizedEventTime(Event);
int Scan = Track.EventList.Count - 1;
while (Scan >= 0)
{
QuantEventRec OtherEvent = Track.EventList[Scan];
FractionRec OtherEventStartTime = GetQuantizedEventTime(OtherEvent);
if (FractionRec.FracGreaterEqual(OurEventStartTime, OtherEventStartTime))
{
Track.EventList.Insert(Scan + 1, Event);
return;
}
Scan -= 1;
}
Track.EventList.Insert(0, Event);
}
/* create new interval note */
public static QuantEventRec NewQuantizedNoteEvent(
FractionRec StartTime,
double StartTimeAdjust,
NoteFlags Duration,
double DurationAdjust,
short MIDIPitch,
short MIDIAttackVelocity,
short MIDIReleaseVelocity)
{
QuantEventRec Event = new QuantEventRec();
Event.Type = QuantEventType.eQuantizedNoteEvent;
Event.StartTime = StartTime;
Event.StartTimeAdjust = StartTimeAdjust;
Event.Duration = Duration;
Event.DurationAdjust = DurationAdjust;
Event.MIDIPitch = MIDIPitch;
Event.MIDIAttackVelocity = MIDIAttackVelocity;
Event.MIDIReleaseVelocity = MIDIReleaseVelocity;
Event.TieTarget = null;
return(Event);
}
/* compute duration opcode for maximum atomic note that is less than or */
/* equal to the specified fractional duration */
private static NoteFlags GetMaxDurationOpcode(
FractionRec TargetDuration,
out FractionRec ComputedDuration,
OpDurRec[] OpcodeDurationTable,
int OpcodeDurationTableLength)
{
int Scan;
for (Scan = 0; Scan < OpcodeDurationTableLength; Scan += 1)
{
if (!FractionRec.FracGreaterThan(OpcodeDurationTable[Scan].Duration, TargetDuration))
{
ComputedDuration = OpcodeDurationTable[Scan].Duration;
return(OpcodeDurationTable[Scan].Opcode);
}
}
/* probably the start time quantizer is generating intervals that */
/* can't be represented. */
Debug.Assert(false); // couldn't find available note
ComputedDuration = OpcodeDurationTable[OpcodeDurationTableLength - 1].Duration;
return(OpcodeDurationTable[OpcodeDurationTableLength - 1].Opcode);
}
/* multiply fractions. destination can be one of the sources */
/* this function will fail on numbers considerably smaller than the */
/* range of representable fractions. */
public static void MultFractions(FractionRec Left, FractionRec Right, out FractionRec Dest)
{
if ((Left.Fraction >= Left.Denominator) || (Right.Fraction >= Right.Denominator))
{
// numerator is larger than denominator
Debug.Assert(false);
throw new ArgumentException();
}
ReduceFraction(ref Left);
ReduceFraction(ref Right);
/* the product of two fractions: A/B * C/D == AC/BD */
/* here we multiply the denominators */
uint Denominator = Left.Denominator * Right.Denominator;
/* here we multiply the numerators */
uint Numerator = (Left.Integer * Left.Denominator + Left.Fraction)
* (Right.Integer * Right.Denominator + Right.Fraction);
/* division gives us the integer part back and the remainder is the numerator */
Dest = new FractionRec(Numerator / Denominator, Numerator % Denominator, Denominator);
/* keep denominators under control */
ReduceFraction(ref Dest);
}
/* make fraction. arguments do not have to be normalized */
public static void MakeFraction(out FractionRec Fraction, int Integer, int Numerator, int Denominator)
{
if (Denominator == 0)
{
Debug.Assert(false);
throw new ArgumentException();
}
if (Denominator < 0)
{
Denominator = -Denominator;
Numerator = -Numerator;
}
int Overflow;
if (Numerator < 0)
{
/* round down, even for negative numbers */
Overflow = (Numerator - (Denominator - 1)) / Denominator;
}
else
{
Overflow = Numerator / Denominator;
}
Integer += Overflow;
Numerator -= Denominator * Overflow;
if (Integer < 0)
{
// fraction is negative
Debug.Assert(false);
throw new ArgumentException();
}
Fraction = new FractionRec((uint)Integer, (uint)Numerator, (uint)Denominator);
ReduceFraction(ref Fraction);
}
/* insert rests */
private static void InsertRests(
FractionRec Now,
FractionRec Target,
TrackObjectRec NoteTrack,
OpDurRec[] OpcodeDurationTable,
int OpcodeDurationTableLength)
{
while (FractionRec.FracGreaterThan(Target, Now))
{
FractionRec Difference;
NoteFlags Opcode;
FractionRec OpcodesDuration;
NoteNoteObjectRec Note;
FrameObjectRec Frame;
/* how much time left */
FractionRec.SubFractions(Target, Now, out Difference);
/* search for appropriate opcode */
Opcode = GetMaxDurationOpcode(Difference, out OpcodesDuration, OpcodeDurationTable, OpcodeDurationTableLength);
/* add duration to Now */
FractionRec.AddFractions(Now, OpcodesDuration, out Now);
/* create the note */
Note = new NoteNoteObjectRec(NoteTrack);
Note.PutNoteDuration(Opcode & NoteFlags.eDurationMask);
Note.PutNoteDurationDivision(Opcode & NoteFlags.eDivisionMask);
Note.PutNoteDotStatus((Opcode & NoteFlags.eDotModifier) != 0);
Note.PutNotePitch(Constants.CENTERNOTE);
Note.PutNoteIsItARest(true);
/* create the frame */
Frame = new FrameObjectRec();
Frame.Add(Note);
NoteTrack.FrameArray.Add(Frame);
}
}
/* subtract second fraction from first. Destination can be one of the sources */
public static void SubFractions(FractionRec Left, FractionRec Right, out FractionRec Dest)
{
if ((Left.Fraction >= Left.Denominator) || (Right.Fraction >= Right.Denominator))
{
// numerator is larger than denominator
Debug.Assert(false);
throw new ArgumentException();
}
/* add fractional parts */
int FractionTemp;
int DenominatorTemp;
if (Left.Denominator == Right.Denominator)
{
/* if the denominators are the same, then adding is really easy */
DenominatorTemp = (int)Left.Denominator;
FractionTemp = (int)Left.Fraction - (int)Right.Fraction;
}
else
{
uint GCF;
/* if the denominators are not the same, then we need to multiply each */
/* side by some number so that they will be the same. finding the greatest */
/* common factor helps us find the smallest number to multiply by. */
/* Left->Denominator / GCF = the factors that left has which right needs. */
/* Right->Denominator / GCF = the factors that right has which left needs. */
GCF = FindCommonFactors(Left.Denominator, Right.Denominator);
/* by multiplying the denominators together, then dividing out the extra */
/* set of common factors, we find the smallest common denominator. The */
/* division is performed inside to prevent overflow */
DenominatorTemp = (int)((Left.Denominator / GCF) * Right.Denominator);
/* the left and right sides should yield the same denominator */
if (DenominatorTemp != (Right.Denominator / GCF) * Left.Denominator)
{
// couldn't factor denominators
Debug.Assert(false);
throw new ArgumentException();
}
/* since we are multiplying each fraction by N/N, we need to multiply */
/* the numerators by the same thing we multiplied the denominators by. */
FractionTemp = (int)(Left.Fraction * (Right.Denominator / GCF))
- (int)(Right.Fraction * (Left.Denominator / GCF));
}
/* add the integer components */
int IntegerTemp = (int)Left.Integer - (int)Right.Integer;
/* if there was an overflow in the fractional part, carry it to the integer */
if (FractionTemp >= DenominatorTemp)
{
// overflow occurred when it shouldn't
Debug.Assert(false);
throw new ArgumentException();
}
if (FractionTemp < 0)
{
/* since we are adding, the amount of carry should never be more than 1 */
FractionTemp += DenominatorTemp;
IntegerTemp -= 1;
}
if (FractionTemp < 0)
{
// numerator is way too small
Debug.Assert(false);
throw new ArgumentException();
}
/* store result */
Dest = new FractionRec((uint)IntegerTemp, (uint)FractionTemp, (uint)DenominatorTemp);
}
/* convert interval track into quantized track. */
public static bool ConvertIntervalToQuantized(
IntervalTrackRec IntervalTrack,
QuantizedTrackRec QuantizedTrack,
int MidiQuarterNote)
{
int Scan;
int Limit;
TimeMatchRec[] MatchingTable = new TimeMatchRec[4 /*divisions*/ * 2 /*dot*/ * 9 /*notetypes*/];
int MatchingTableLength;
/* build duration matching table */
MatchingTableLength = 0;
for (Scan = 0; Scan < 4 /*divisions*/ * 2 /*dot*/ * 9 /*notetypes*/; Scan += 1)
{
double MIDIClocks;
NoteFlags Descriptor;
FractionRec DurationFraction;
/* determine root duration and descriptor */
switch (Scan % 9)
{
default:
Debug.Assert(false);
throw new InvalidOperationException();
case 0:
Descriptor = NoteFlags.e64thNote;
break;
case 1:
Descriptor = NoteFlags.e32ndNote;
break;
case 2:
Descriptor = NoteFlags.e16thNote;
break;
case 3:
Descriptor = NoteFlags.e8thNote;
break;
case 4:
Descriptor = NoteFlags.e4thNote;
break;
case 5:
Descriptor = NoteFlags.e2ndNote;
break;
case 6:
Descriptor = NoteFlags.eWholeNote;
break;
case 7:
Descriptor = NoteFlags.eDoubleNote;
break;
case 8:
Descriptor = NoteFlags.eQuadNote;
break;
}
/* determine if dot is needed */
if (((Scan / 9) % 2) != 0)
{
/* dot needed */
Descriptor |= NoteFlags.eDotModifier;
}
/* determine what division is needed */
switch (((Scan / 9) / 2) % 4)
{
default:
Debug.Assert(false);
throw new InvalidOperationException();
case 0:
break;
case 1:
Descriptor |= NoteFlags.eDiv3Modifier;
break;
case 2:
Descriptor |= NoteFlags.eDiv5Modifier;
break;
case 3:
Descriptor |= NoteFlags.eDiv7Modifier;
break;
}
/* how int is this note */
NoteNoteObjectRec.ConvertDurationFrac(Descriptor, out DurationFraction); /* units of whole notes */
MIDIClocks = MidiQuarterNote * (4 * FractionRec.Fraction2Double(DurationFraction));
/* add to table if note can be represented in the timing scheme */
/* AND only if note is an integer multiple of the 64th div3 (see */
/* comment at the top of this file for the rationale) */
if ((MIDIClocks == Math.Floor(MIDIClocks)) && (MIDIClocks >= 1) && IntMultOf64thDiv3(Descriptor))
{
MatchingTable[MatchingTableLength].Ticks = (int)MIDIClocks;
MatchingTable[MatchingTableLength].Descriptor = Descriptor;
MatchingTableLength += 1;
}
}
/* quantize note events */
Limit = GetIntervalTrackLength(IntervalTrack);
for (Scan = 0; Scan < Limit; Scan += 1)
{
IntEventRec Event;
Event = GetIntervalTrackIndexedEvent(IntervalTrack, Scan);
switch (IntervalEventGetType(Event))
{
default:
Debug.Assert(false);
throw new InvalidOperationException();
case IntEventType.eIntervalNoteEvent:
{
/* input values */
int StartTime;
int Duration;
short MIDIPitch;
short MIDIAttackVelocity;
short MIDIReleaseVelocity;
/* output values */
NoteFlags QuantizedDuration;
double QuantizedDurationAdjust;
int WholeNoteOverflow;
FractionRec QuantizedStartTime;
double QuantizedStartTimeAdjust;
double WholeNoteStartTimeAdjust; /* auxiliary value */
/* stuff */
QuantEventRec QuantEvent;
/* get the information */
GetIntervalNoteEventInfo(Event, out StartTime, out Duration, out MIDIPitch,
out MIDIAttackVelocity, out MIDIReleaseVelocity);
/* quantize duration */
QuantizeDuration(Duration, MidiQuarterNote, MatchingTable,
MatchingTableLength, out QuantizedDuration, out QuantizedDurationAdjust,
out WholeNoteOverflow);
Debug.Assert(IntMultOf64thDiv3(QuantizedDuration)); // non-64div3 duration quantization?
/* quantize start time */
QuantizeStartTime(StartTime, MidiQuarterNote, QuantizedDuration,
QuantizedDurationAdjust, out QuantizedStartTime, out QuantizedStartTimeAdjust,
out WholeNoteStartTimeAdjust);
Debug.Assert(FractionIntMultOf64thDiv3(QuantizedStartTime)); // non-64div3 start time quantization?
/* bump start time to end of whole note chain */
QuantizedStartTime.Integer += (uint)WholeNoteOverflow;
/* create new event & insert into track */
QuantEvent = NewQuantizedNoteEvent(QuantizedStartTime,
QuantizedStartTimeAdjust, QuantizedDuration, QuantizedDurationAdjust,
MIDIPitch, MIDIAttackVelocity, MIDIReleaseVelocity);
QuantizedTrackInsertEventSorted(QuantizedTrack, QuantEvent);
/* insert whole notes behind the last note in reverse order */
while (WholeNoteOverflow > 0)
{
QuantEventRec Predecessor;
/* create preceding whole note */
QuantizedStartTime.Integer -= 1;
Predecessor = NewQuantizedNoteEvent(QuantizedStartTime,
WholeNoteStartTimeAdjust, NoteFlags.eWholeNote, 1, MIDIPitch,
MIDIAttackVelocity, MIDIReleaseVelocity);
QuantizedTrackInsertEventSorted(QuantizedTrack, Predecessor);
/* set tie */
PutQuantizedEventTieTarget(Predecessor, QuantEvent);
QuantEvent = Predecessor;
/* step */
WholeNoteOverflow -= 1;
}
}
break;
case IntEventType.eIntervalCommentEvent:
{
QuantEventRec QuantEvent;
/* input values */
int StartTime;
string OriginalString;
/* output values */
FractionRec QuantizedStartTime;
/* get the information */
GetIntervalCommentEventInfo(Event, out StartTime, out OriginalString);
/* compute start time to nearest 64th div3 */
FractionRec.Double2Fraction(StartTime / (double)MidiQuarterNote,
64 * 3, out QuantizedStartTime);
Debug.Assert(FractionIntMultOf64thDiv3(QuantizedStartTime)); //non-64div3 start time quantization?
/* create new event & insert into track */
QuantEvent = NewQuantizedCommentEvent(QuantizedStartTime, 0, OriginalString);
QuantizedTrackInsertEventSorted(QuantizedTrack, QuantEvent);
}
break;
}
}
return(true);
}
/* fill in opcode table and sort for largest-duration first */
private static void InitializeOpcodeDurationTable(
OpDurRec[] Table, // [4/*divisions*/ * 2/*dot*/ * 9/*notetypes*/]
out int TableLengthOut)
{
Debug.Assert(Table.Length == 4 /*divisions*/ * 2 /*dot*/ * 9 /*notetypes*/);
/* scan all possible notes */
TableLengthOut = 0;
for (int Scan = 0; Scan < 4 /*divisions*/ * 2 /*dot*/ * 9 /*notetypes*/; Scan += 1)
{
NoteFlags Descriptor;
FractionRec DurationFraction;
int InsertScan;
int EndScan;
/* determine root duration and descriptor */
switch (Scan % 9)
{
default:
Debug.Assert(false);
throw new InvalidOperationException();
case 0:
Descriptor = NoteFlags.e64thNote;
break;
case 1:
Descriptor = NoteFlags.e32ndNote;
break;
case 2:
Descriptor = NoteFlags.e16thNote;
break;
case 3:
Descriptor = NoteFlags.e8thNote;
break;
case 4:
Descriptor = NoteFlags.e4thNote;
break;
case 5:
Descriptor = NoteFlags.e2ndNote;
break;
case 6:
Descriptor = NoteFlags.eWholeNote;
break;
case 7:
Descriptor = NoteFlags.eDoubleNote;
break;
case 8:
Descriptor = NoteFlags.eQuadNote;
break;
}
/* determine if dot is needed */
if (((Scan / 9) % 2) != 0)
{
/* dot needed */
Descriptor |= NoteFlags.eDotModifier;
}
/* determine what division is needed */
switch (((Scan / 9) / 2) % 4)
{
default:
Debug.Assert(false);
throw new InvalidOperationException();
case 0:
break;
case 1:
Descriptor |= NoteFlags.eDiv3Modifier;
break;
case 2:
Descriptor |= NoteFlags.eDiv5Modifier;
break;
case 3:
Descriptor |= NoteFlags.eDiv7Modifier;
break;
}
/* don't use ugly rests, except we need the 64th div3 (see below) */
if (!(((Descriptor & NoteFlags.eDivisionMask) == NoteFlags.eDiv5Modifier) ||
((Descriptor & NoteFlags.eDivisionMask) == NoteFlags.eDiv7Modifier) ||
((Descriptor & NoteFlags.eDotModifier) != 0) ||
(((Descriptor & NoteFlags.eDivisionMask) == NoteFlags.eDiv3Modifier) &&
((Descriptor & NoteFlags.eDurationMask) != NoteFlags.e64thNote))))
{
/* don't use things that aren't multiples of a 64th div3 note. see the */
/* comment at the top of ConvertIntToQuant for the rationale. */
if (IntMultOf64thDiv3(Descriptor))
{
/* get duration, units of whole notes */
NoteNoteObjectRec.ConvertDurationFrac(Descriptor, out DurationFraction);
/* add duration to table */
InsertScan = 0;
while (InsertScan < TableLengthOut)
{
if (FractionRec.FracGreaterThan(DurationFraction, Table[InsertScan].Duration))
{
/* insert here */
goto InsertNowPoint;
}
else if (FractionRec.FractionsEqual(DurationFraction, Table[InsertScan].Duration))
{
/* redundant */
goto DoneInsertingPoint;
}
else
{
/* try the next one */
InsertScan += 1;
}
}
/* this gets executed to insert a new value before Table[InsertScan] */
InsertNowPoint:
for (EndScan = TableLengthOut - 1; EndScan >= InsertScan; EndScan -= 1)
{
Table[EndScan + 1] = Table[EndScan];
}
Table[InsertScan].Opcode = Descriptor;
Table[InsertScan].Duration = DurationFraction;
TableLengthOut++;
DoneInsertingPoint:
;
}
}
}
/* verify sort order */
#if DEBUG
for (int Scan = 0; Scan < TableLengthOut - 1; Scan += 1)
{
if (!FractionRec.FracGreaterThan(Table[Scan].Duration, Table[Scan + 1].Duration))
{
// sort failure
Debug.Assert(false);
throw new InvalidOperationException();
}
}
#endif
}
/* convert quantized track into native track */
public static void ConvertQuantToNote(
QuantizedTrackRec QuantizedTrack,
TrackObjectRec NoteTrack)
{
FractionRec CurrentTime;
int Index;
int Limit;
List <QuantEventRec> FrameArray;
TieMappingRec TieMapping;
int OpcodeDurationTableLength;
OpDurRec[] OpcodeDurationTable = new OpDurRec[4 /*divisions*/ * 2 /*dot*/ * 9 /*notetypes*/];
/* initialize variables */
InitializeOpcodeDurationTable(OpcodeDurationTable, out OpcodeDurationTableLength);
CurrentTime.Integer = 0;
CurrentTime.Fraction = 0;
CurrentTime.Denominator = 1;
FrameArray = new List <QuantEventRec>();
TieMapping = NewTieMapping();
Limit = GetQuantizedTrackLength(QuantizedTrack);
Index = 0;
/* iterate over variables */
while (Index < Limit)
{
FractionRec NextTime;
QuantEventRec QuantEvent;
bool Continue;
int InspectScan;
/* reset frame array */
FrameArray.Clear();
/* get the start time of the next available event */
QuantEvent = GetQuantizedTrackIndexedEvent(QuantizedTrack, Index);
NextTime = GetQuantizedEventTime(QuantEvent);
Debug.Assert(FractionIntMultOf64thDiv3(NextTime)); // non-64div3 start time quantization?
/* sanity check */
Debug.Assert(!FractionRec.FracGreaterThan(CurrentTime, NextTime)); // next time inconsistency
/* get all events starting at this time into FrameArray */
Continue = true;
while (Continue && (Index < Limit))
{
FractionRec EventTime;
/* get the event */
QuantEvent = GetQuantizedTrackIndexedEvent(QuantizedTrack, Index);
EventTime = GetQuantizedEventTime(QuantEvent);
Debug.Assert(FractionIntMultOf64thDiv3(EventTime)); // non-64div3 start time quantization?
if (FractionRec.FractionsEqual(EventTime, NextTime))
{
/* add event to the list */
FrameArray.Add(QuantEvent);
/* go past this event */
Index += 1;
}
else
{
/* end hit so stop */
Continue = false;
}
}
/* insert rests to bring current time up to next time */
InsertRests(CurrentTime, NextTime, NoteTrack, OpcodeDurationTable, OpcodeDurationTableLength);
/* remove command events from list */
InspectScan = 0;
while (InspectScan < FrameArray.Count)
{
/* get the event */
QuantEvent = FrameArray[InspectScan];
/* determine if event is a command */
if (QuantizedEventGetType(QuantEvent) == QuantEventType.eQuantizedNoteEvent)
{
/* note events should be skipped */
InspectScan += 1;
}
else
{
/* command events should be handled */
switch (QuantizedEventGetType(QuantEvent))
{
default:
Debug.Assert(false);
throw new InvalidOperationException();
case QuantEventType.eQuantizedCommentEvent:
{
string CommentString;
CommandNoteObjectRec Note;
FrameObjectRec Frame;
FractionRec unusedf;
double unusedd;
GetQuantizedCommentEventInfo(QuantEvent, out unusedf, out unusedd, out CommentString);
Note = new CommandNoteObjectRec(NoteTrack);
Note.PutCommandStringArg1(CommentString);
Note.PutCommandOpcode(NoteCommands.eCmdMarker);
Frame = new FrameObjectRec();
Frame.Add(Note);
NoteTrack.FrameArray.Add(Frame);
}
break;
}
/* delete event from array */
FrameArray.RemoveAt(InspectScan);
/* don't increment InspectScan */
}
}
/* process remaining notes in FrameArray, computing minimum duration */
/* and updating CurrentTime with minimum duration. */
if (FrameArray.Count != 0)
{
NoteFlags DurationOpcode;
FrameObjectRec Frame;
int Scan;
int FrameLimit;
FractionRec MinimumDuration;
FractionRec unusedf;
double unusedd;
short unuseds;
/* initialize minimum duration */
QuantEvent = FrameArray[0];
GetQuantizedNoteEventInfo(QuantEvent, out unusedf, out unusedd, out DurationOpcode,
out unusedd, out unuseds, out unuseds, out unuseds);
NoteNoteObjectRec.ConvertDurationFrac(DurationOpcode, out MinimumDuration);
Debug.Assert(FractionIntMultOf64thDiv3(MinimumDuration)); // non-64div3 duration quantization?
/* allocate frame */
Frame = new FrameObjectRec();
/* process notes in frame */
FrameLimit = FrameArray.Count;
for (Scan = 0; Scan < FrameLimit; Scan += 1)
{
FractionRec StartTime;
double StartTimeAdjust;
NoteFlags Duration;
double DurationAdjust;
short MIDIPitch;
short MIDIAttackVelocity;
short MIDIReleaseVelocity;
NoteNoteObjectRec Note;
FractionRec FracDuration;
/* get the note */
QuantEvent = FrameArray[Scan];
Debug.Assert(QuantizedEventGetType(QuantEvent) == QuantEventType.eQuantizedNoteEvent); // non-note in frame array
/* get attributes */
GetQuantizedNoteEventInfo(QuantEvent, out StartTime, out StartTimeAdjust,
out Duration, out DurationAdjust, out MIDIPitch, out MIDIAttackVelocity,
out MIDIReleaseVelocity);
Debug.Assert(IntMultOf64thDiv3(Duration)); // non-64div3 duration quantization?
Debug.Assert(FractionRec.FractionsEqual(StartTime, CurrentTime)); // start time inconsistency
/* create note */
Note = new NoteNoteObjectRec(NoteTrack);
Frame.Add(Note);
TieMappingAddPair(TieMapping, QuantEvent, Note);
/* set note attributes */
Note.PutNoteDuration(Duration & NoteFlags.eDurationMask);
Note.PutNoteDurationDivision(Duration & NoteFlags.eDivisionMask);
Note.PutNoteDotStatus((Duration & NoteFlags.eDotModifier) != 0);
Note.EarlyLateAdjust = StartTimeAdjust;
Note.DurationAdjust = DurationAdjust;
Note.DurationAdjustMode = NoteFlags.eDurationAdjustMultiplicative;
Note.PutNotePitch((short)(MIDIPitch - MIDIC + Constants.CENTERNOTE));
Note.Accent1 = (MIDIAttackVelocity > 0)
? -Math.Log(MIDIAttackVelocity) / Constants.LOG2 + LN127OVERLN2 : 7;
Note.Accent2 = (MIDIReleaseVelocity > 0)
? -Math.Log(MIDIReleaseVelocity) / Constants.LOG2 + LN127OVERLN2 : 7;
switch ((MIDIPitch - MIDIC + ((MIDIC / 12 + 1) * 12)) % 12)
{
default:
// midi sharp/flat problem
Debug.Assert(false);
throw new InvalidOperationException();
case 0: /* C */
case 2: /* D */
case 4: /* E */
case 5: /* F */
case 7: /* G */
case 9: /* A */
case 11: /* B */
break;
case 1: /* C# */
case 3: /* D# */
case 6: /* F# */
case 8: /* G# */
case 10: /* A# */
Note.PutNoteFlatOrSharpStatus(NoteFlags.eSharpModifier);
break;
}
/* do the minimum duration thing */
NoteNoteObjectRec.ConvertDurationFrac(Duration, out FracDuration);
Debug.Assert(FractionIntMultOf64thDiv3(FracDuration)); // non-64div3 duration quantization?
if (FractionRec.FracGreaterThan(MinimumDuration, FracDuration))
{
MinimumDuration = FracDuration;
}
}
/* add frame to track */
NoteTrack.FrameArray.Add(Frame);
/* if minimum duration is greater than time to next event, then */
/* add rests (one to this frame) to fill in the gap */
if (Index < Limit)
{
FractionRec NextEventTime;
FractionRec Difference;
/* get the start time of the next available event */
QuantEvent = GetQuantizedTrackIndexedEvent(QuantizedTrack, Index);
NextEventTime = GetQuantizedEventTime(QuantEvent);
Debug.Assert(FractionIntMultOf64thDiv3(NextEventTime)); // non-64div3 start time quantization?
FractionRec.SubFractions(NextEventTime, CurrentTime, out Difference);
if (FractionRec.FracGreaterThan(MinimumDuration, Difference))
{
NoteNoteObjectRec Note;
NoteFlags RestOpcode;
FractionRec OpcodesDuration;
/* insert first rest into frame */
RestOpcode = GetMaxDurationOpcode(Difference, out OpcodesDuration,
OpcodeDurationTable, OpcodeDurationTableLength);
Debug.Assert(IntMultOf64thDiv3(RestOpcode)); // non-64div3 duration quantization
Note = new NoteNoteObjectRec(NoteTrack);
Note.PutNoteDuration(RestOpcode & NoteFlags.eDurationMask);
Note.PutNoteDurationDivision(RestOpcode & NoteFlags.eDivisionMask);
Note.PutNoteDotStatus((RestOpcode & NoteFlags.eDotModifier) != 0);
Note.PutNotePitch(Constants.CENTERNOTE);
Note.PutNoteIsItARest(true);
Frame.Add(Note);
/* put new minimum duration in to reflect new rest we added */
NoteNoteObjectRec.ConvertDurationFrac(RestOpcode, out MinimumDuration);
}
}
/* advance thing by minimum duration */
FractionRec.AddFractions(MinimumDuration, CurrentTime, out CurrentTime);
Debug.Assert(FractionIntMultOf64thDiv3(CurrentTime)); // non-64div3 start time quantization?
}
}
/* patch up ties */
for (Index = 0; Index < Limit; Index += 1)
{
QuantEventRec QuantEvent;
/* get potential event */
QuantEvent = GetQuantizedTrackIndexedEvent(QuantizedTrack, Index);
/* see if it ties somewhere */
if ((QuantEventType.eQuantizedNoteEvent == QuantizedEventGetType(QuantEvent)) &&
(GetQuantizedEventTieTarget(QuantEvent) != null))
{
QuantEventRec TieTarget;
NoteNoteObjectRec Source;
NoteNoteObjectRec Target;
/* get tie target */
TieTarget = GetQuantizedEventTieTarget(QuantEvent);
/* look up source and target note events */
Source = TieMappingLookup(TieMapping, QuantEvent);
Target = TieMappingLookup(TieMapping, TieTarget);
/* establish tie */
Source.PutNoteTieTarget(Target);
}
}
/* look for track name comment */
for (Index = 0; Index < Limit; Index += 1)
{
QuantEventRec QuantEvent;
/* get potential event */
QuantEvent = GetQuantizedTrackIndexedEvent(QuantizedTrack, Index);
/* see if it ties somewhere */
if (QuantEventType.eQuantizedCommentEvent == QuantizedEventGetType(QuantEvent))
{
string CommentString;
FractionRec unusedf;
double unusedd;
GetQuantizedCommentEventInfo(QuantEvent, out unusedf, out unusedd, out CommentString);
/* check for track name */
if ((CommentString.Length > 11 /*Prefix*/ + Environment.NewLine.Length) &&
CommentString.StartsWith("Track Name" + Environment.NewLine))
{
string NameString = CommentString.Substring(11, CommentString.Length - (11 + 1));
NoteTrack.Name = NameString;
goto FinishedSettingTrackName;
}
}
}
/* if no track name was found, then use the first comment string */
for (Index = 0; Index < Limit; Index += 1)
{
QuantEventRec QuantEvent;
/* get potential event */
QuantEvent = GetQuantizedTrackIndexedEvent(QuantizedTrack, Index);
/* see if it ties somewhere */
if (QuantEventType.eQuantizedCommentEvent == QuantizedEventGetType(QuantEvent))
{
string CommentString;
FractionRec unusedf;
double unusedd;
GetQuantizedCommentEventInfo(QuantEvent, out unusedf, out unusedd, out CommentString);
/* check for track name */
if ((CommentString.Length > 8 /*Prefix*/ + Environment.NewLine.Length) &&
CommentString.StartsWith("Comment" + Environment.NewLine))
{
string NameString;
NameString = CommentString.Substring(8, CommentString.Length - (8 + 1));
NoteTrack.Name = NameString;
goto FinishedSettingTrackName;
}
}
}
FinishedSettingTrackName:
;
}