-
Notifications
You must be signed in to change notification settings - Fork 2.6k
/
importmidi_meter.cpp
533 lines (462 loc) · 20.5 KB
/
importmidi_meter.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
#include "importmidi_meter.h"
#include "importmidi_fraction.h"
#include "libmscore/durationtype.h"
#include "libmscore/mscore.h"
#include "importmidi_tuplet.h"
#include "importmidi_chord.h"
#include "importmidi_inner.h"
namespace Ms {
namespace Meter {
bool isSimple(const ReducedFraction &barFraction) // 2/2, 3/4, 4/4, ...
{
return barFraction.numerator() < 5;
}
bool isCompound(const ReducedFraction &barFraction) // 6/8, 12/4, ...
{
return barFraction.numerator() % 3 == 0 && barFraction.numerator() > 3;
}
bool isComplex(const ReducedFraction &barFraction) // 5/4, 7/8, ...
{
return barFraction.numerator() == 5 || barFraction.numerator() == 7;
}
bool isDuple(const ReducedFraction &barFraction) // 2/2, 6/8, ...
{
return barFraction.numerator() == 2 || barFraction.numerator() == 6;
}
bool isTriple(const ReducedFraction &barFraction) // 3/4, 9/4, ...
{
return barFraction.numerator() == 3 || barFraction.numerator() == 9;
}
bool isQuadruple(const ReducedFraction &barFraction) // 4/4, 12/8, ...
{
return barFraction.numerator() % 4 == 0;
}
bool isQuintuple(const ReducedFraction &barFraction) // 5/4, 15/8, ...
{
return barFraction.numerator() % 5 == 0;
}
bool isSeptuple(const ReducedFraction &barFraction) // 7/8, 21/8, ...
{
return barFraction.numerator() % 7 == 0;
}
// list of bar division lengths in ticks (whole bar len, half bar len, ...)
// and its corresponding levels
// tuplets are not taken into account here
DivisionInfo metricDivisionsOfBar(const ReducedFraction &barFraction)
{
DivisionInfo barDivInfo;
barDivInfo.len = barFraction;
// first value of each element in list is a length (in ticks) of every part of bar
// on which bar is subdivided on each level
// the level value is a second value of each element
auto &divLengths = barDivInfo.divLengths;
int level = 0;
divLengths.push_back({barFraction, level});
// pulse-level division
if (isDuple(barFraction))
divLengths.push_back({barFraction / 2, --level});
else if (isTriple(barFraction))
divLengths.push_back({barFraction / 3, --level});
else if (isQuadruple(barFraction)) {
divLengths.push_back({barFraction / 2, --level}); // additional central accent
divLengths.push_back({barFraction / 4, --level});
}
else if (isQuintuple(barFraction)) {
divLengths.push_back({barFraction / 5, --level});
}
else if (isSeptuple(barFraction)) {
divLengths.push_back({barFraction / 7, --level});
}
else { // if other - complex meter
divLengths.push_back({barFraction / barFraction.numerator(), --level});
}
if (isCompound(barFraction)) {
--level; // additional min level for pulse divisions
// subdivide pulse of compound meter into 3 parts
divLengths.push_back({divLengths.back().len / 3, --level});
}
while (divLengths.back().len >= MChord::minAllowedDuration() * 2)
divLengths.push_back({divLengths.back().len / 2, --level});
return barDivInfo;
}
DivisionInfo metricDivisionsOfTuplet(const MidiTuplet::TupletData &tuplet,
int tupletStartLevel)
{
DivisionInfo tupletDivInfo;
tupletDivInfo.onTime = tuplet.onTime;
tupletDivInfo.len = tuplet.len;
tupletDivInfo.isTuplet = true;
tupletDivInfo.divLengths.push_back({tuplet.len, TUPLET_BOUNDARY_LEVEL});
const auto divLen = tuplet.len / tuplet.tupletNumber;
tupletDivInfo.divLengths.push_back({divLen, tupletStartLevel--});
while (tupletDivInfo.divLengths.back().len >= MChord::minAllowedDuration() * 2) {
tupletDivInfo.divLengths.push_back({
tupletDivInfo.divLengths.back().len / 2, tupletStartLevel--});
}
return tupletDivInfo;
}
ReducedFraction beatLength(const ReducedFraction &barFraction)
{
auto beatLen = barFraction / 4;
if (isDuple(barFraction))
beatLen = barFraction / 2;
else if (isTriple(barFraction))
beatLen = barFraction / 3;
else if (isQuadruple(barFraction))
beatLen = barFraction / 4;
else if (isComplex(barFraction))
beatLen = barFraction / barFraction.numerator();
return beatLen;
}
std::vector<ReducedFraction> divisionsOfBarForTuplets(const ReducedFraction &barFraction)
{
const DivisionInfo info = metricDivisionsOfBar(barFraction);
std::vector<ReducedFraction> divLengths;
const auto beatLen = beatLength(barFraction);
for (const auto &i: info.divLengths) {
// in compound or complex meter
// tuplet starts from beat level, not the whole bar
if ((isCompound(barFraction) || isComplex(barFraction)) && i.len > beatLen)
continue;
divLengths.push_back(i.len);
}
return divLengths;
}
// result in vector: first elements - all tuplets info, one at the end - bar division info
std::vector<DivisionInfo> divisionInfo(const ReducedFraction &barFraction,
const std::vector<MidiTuplet::TupletData> &tupletsInBar)
{
std::vector<DivisionInfo> divsInfo;
const auto barDivisionInfo = metricDivisionsOfBar(barFraction);
for (const auto &tuplet: tupletsInBar) {
int tupletStartLevel = 0;
for (const auto &divLenInfo: barDivisionInfo.divLengths) {
if (divLenInfo.len == tuplet.len) {
tupletStartLevel = divLenInfo.level;
break;
}
}
divsInfo.push_back(metricDivisionsOfTuplet(tuplet, --tupletStartLevel));
}
divsInfo.push_back(barDivisionInfo);
return divsInfo;
}
// tick is counted from the beginning of bar
int levelOfTick(const ReducedFraction &tick, const std::vector<DivisionInfo> &divsInfo)
{
for (const auto &divInfo: divsInfo) {
if (tick < divInfo.onTime || tick > divInfo.onTime + divInfo.len)
continue;
for (const auto &divLenInfo: divInfo.divLengths) {
const auto ratio = (tick - divInfo.onTime) / divLenInfo.len;
if (ratio.numerator() % ratio.denominator() == 0)
return divLenInfo.level;
}
}
return 0;
}
std::vector<int> metricLevelsOfBar(const ReducedFraction &barFraction,
const std::vector<DivisionInfo> &divsInfo,
const ReducedFraction &minDuration)
{
std::vector<int> levels;
for (ReducedFraction tick(0, 1); tick < barFraction; tick += minDuration)
levels.push_back(levelOfTick(tick, divsInfo));
return levels;
}
// return level with pos == Fraction(-1, 1) if undefined - see MaxLevel class
Meter::MaxLevel maxLevelBetween(const ReducedFraction &startTickInBar,
const ReducedFraction &endTickInBar,
const DivisionInfo &divInfo)
{
MaxLevel level;
const auto startTickInDiv = startTickInBar - divInfo.onTime;
const auto endTickInDiv = endTickInBar - divInfo.onTime;
if (startTickInDiv >= endTickInDiv || startTickInDiv < ReducedFraction(0, 1)
|| endTickInDiv > divInfo.len)
return level;
for (const auto &divLengthInfo: divInfo.divLengths) {
const auto &divLen = divLengthInfo.len;
const auto ratio = endTickInDiv / divLen;
auto maxEndRaster = divLen * (ratio.numerator() / ratio.denominator());
if (maxEndRaster == endTickInDiv)
maxEndRaster -= divLen;
if (startTickInDiv < maxEndRaster) {
// max level is found
const auto sratio = startTickInDiv / divLen;
const auto maxStartRaster = divLen * (sratio.numerator() / sratio.denominator());
const auto count = (maxEndRaster - maxStartRaster) / divLen;
level.pos = maxStartRaster + divLen + divInfo.onTime;
level.levelCount = count.numerator() / count.denominator();
level.level = divLengthInfo.level;
break;
}
}
return level;
}
// vector<DivisionInfo>:
// first elements - tuplet division info, if there are any tuplets
// last element - always the whole bar division info
// here we use levelCount = 1 always for simplicity
// because TUPLET_BOUNDARY_LEVEL is 'max enough'
Meter::MaxLevel findMaxLevelBetween(const ReducedFraction &startTickInBar,
const ReducedFraction &endTickInBar,
const std::vector<DivisionInfo> &divsInfo)
{
MaxLevel level;
for (const auto &divInfo: divsInfo) {
if (divInfo.isTuplet) {
if (startTickInBar < divInfo.onTime + divInfo.len
&& endTickInBar > divInfo.onTime + divInfo.len) {
level.level = TUPLET_BOUNDARY_LEVEL;
level.levelCount = 1;
level.pos = divInfo.onTime + divInfo.len;
break;
}
if (startTickInBar < divInfo.onTime
&& endTickInBar > divInfo.onTime
&& endTickInBar <= divInfo.onTime + divInfo.len) {
level.level = TUPLET_BOUNDARY_LEVEL;
level.levelCount = 1;
level.pos = divInfo.onTime;
break;
}
if (startTickInBar >= divInfo.onTime
&& endTickInBar <= divInfo.onTime + divInfo.len) {
level = maxLevelBetween(startTickInBar, endTickInBar, divInfo);
break;
}
}
else {
level = maxLevelBetween(startTickInBar, endTickInBar, divInfo);
break;
}
}
return level;
}
int tupletNumberForDuration(const ReducedFraction &startTick,
const ReducedFraction &endTick,
const std::vector<MidiTuplet::TupletData> &tupletsInBar)
{
for (const auto &tupletData: tupletsInBar) {
if (startTick >= tupletData.onTime
&& endTick <= tupletData.onTime + tupletData.len)
return tupletData.tupletNumber;
}
return -1; // this duration is not inside any tuplet
}
bool isPowerOfTwo(unsigned int x)
{
return x && !(x & (x - 1));
}
bool isSimpleNoteDuration(const ReducedFraction &duration)
{
const auto division = ReducedFraction::fromTicks(MScore::division);
auto div = (duration > division) ? duration / division : division / duration;
if (div > ReducedFraction(0, 1)) {
div.reduce();
int minVal = qMin(div.numerator(), div.denominator());
int maxVal = qMax(div.numerator(), div.denominator());
return minVal == 1 && isPowerOfTwo((unsigned int)maxVal);
}
return false;
}
bool isQuarterDuration(const ReducedFraction &ticks)
{
return (ticks.numerator() == 1 && ticks.denominator() == 4);
}
// If last 2/3 of beat in compound meter is rest,
// it should be split into 2 rests
bool is23EndOfBeatInCompoundMeter(const ReducedFraction &startTickInBar,
const ReducedFraction &endTickInBar,
const ReducedFraction &barFraction)
{
if (endTickInBar <= startTickInBar)
return false;
if (!isCompound(barFraction))
return false;
const auto beatLen = beatLength(barFraction);
const auto divLen = beatLen / 3;
const auto ratio1 = startTickInBar / beatLen;
const auto ratio2 = endTickInBar / beatLen;
if ((startTickInBar - beatLen * (ratio1.numerator() / ratio1.denominator()) == divLen)
&& (ratio2.numerator() % ratio2.denominator() == 0))
return true;
return false;
}
bool is2of3RestInTripleMeter(const ReducedFraction &startTickInBar,
const ReducedFraction &endTickInBar,
const ReducedFraction &barFraction)
{
if (endTickInBar - startTickInBar <= ReducedFraction(0, 1))
return false;
if (isTriple(barFraction)
&& (startTickInBar == ReducedFraction(0, 1)
|| endTickInBar == barFraction)
&& endTickInBar - startTickInBar == (barFraction * 2) / 3)
return true;
return false;
}
struct Node
{
Node(int edgeLevel, int midLevel)
: edgeLevel(edgeLevel)
, midLevel(midLevel)
{}
int edgeLevel;
int midLevel;
};
// all durations inside tuplets are smaller/larger than their regular versions
// this difference is represented by tuplet ratio: 3/2 for triplets, etc.
// if node duration is completely inside some tuplet
// then assign to the node tuplet-to-regular-duration conversion coefficient
ReducedFraction findTupletRatio(const ReducedFraction &startPos,
const ReducedFraction &endPos,
const std::vector<MidiTuplet::TupletData> &tupletsInBar)
{
ReducedFraction tupletRatio = {2, 2};
int tupletNumber = tupletNumberForDuration(startPos, endPos, tupletsInBar);
if (tupletNumber != -1)
tupletRatio = MidiTuplet::tupletLimits(tupletNumber).ratio;
return tupletRatio;
}
QList<std::pair<ReducedFraction, TDuration> >
collectDurations(const std::map<ReducedFraction, Node> &nodes,
const std::vector<MidiTuplet::TupletData> &tupletsInBar,
bool useDots,
bool printRestRemains)
{
QList<std::pair<ReducedFraction, TDuration>> resultDurations;
for (auto it1 = nodes.begin(); it1 != nodes.end(); ++it1) {
auto it2 = it1;
++it2;
if (it2 == nodes.end())
break;
const auto tupletRatio = findTupletRatio(it1->first, it2->first, tupletsInBar);
const auto duration = tupletRatio * (it2->first - it1->first);
auto list = toDurationList(duration.fraction(), useDots, 1, printRestRemains);
for (const auto &dur : list)
resultDurations.push_back({tupletRatio, dur});
}
return resultDurations;
}
bool badLevelCondition(int startLevelDiff, int endLevelDiff, int tol)
{
return startLevelDiff > tol || endLevelDiff > tol;
}
int noteCount(const ReducedFraction &duration,
bool useDots)
{
return int(toDurationList(duration.fraction(), useDots, 1, false).size());
}
bool isLessNoteCount(const ReducedFraction &t1,
const ReducedFraction &t2,
const ReducedFraction &t3,
bool useDots)
{
return noteCount(t3 - t1, useDots) <
noteCount(t2 - t1, useDots) + noteCount(t3 - t2, useDots);
}
void excludeNodes(std::map<ReducedFraction, Node> &nodes,
int tol,
bool useDots)
{
if (tol == 0) // no nodes can be excluded
return;
auto p1 = nodes.begin();
if (p1 == nodes.end())
return;
auto p2 = p1;
++p2;
if (p2 == nodes.end())
return;
auto p3 = p2;
++p3;
if (p3 == nodes.end())
return;
while (p3 != nodes.end()) {
if (!badLevelCondition(p2->second.midLevel - p1->second.edgeLevel,
p2->second.midLevel - p3->second.edgeLevel, tol)
&& isLessNoteCount(p1->first, p2->first, p3->first, useDots)) {
p2 = nodes.erase(p2);
++p3;
continue;
}
++p1;
++p2;
++p3;
}
}
// set tuplet boundary level to regular, non-tuplet bar division level
// because there is no more need in tuplet boundary level after split
// and such big level may confuse the estimation algorithm
int adjustEdgeLevelIfTuplet(const Meter::MaxLevel &splitPoint,
const std::vector<DivisionInfo> &divInfo)
{
int tupletLevel = splitPoint.level;
if (splitPoint.level == TUPLET_BOUNDARY_LEVEL) {
std::vector<DivisionInfo> nonTupletDivs({divInfo.back()});
tupletLevel = levelOfTick(splitPoint.pos, nonTupletDivs);
}
return tupletLevel;
}
// duration start/end should be quantisized, quantum >= 1/128 note
// pair here represents the tuplet ratio of duration and the duration itself
// for regular (non-tuplet) durations fraction.numerator == fraction.denominator
// tol - max allowed difference between start/end level of duration and split point level
// 1 for notes, 0 for rests
QList<std::pair<ReducedFraction, TDuration> >
toDurationList(const ReducedFraction &startTickInBar,
const ReducedFraction &endTickInBar,
const ReducedFraction &barFraction,
const std::vector<MidiTuplet::TupletData> &tupletsInBar,
DurationType durationType,
bool useDots,
bool printRestRemains)
{
if (startTickInBar < ReducedFraction(0, 1)
|| endTickInBar <= startTickInBar || endTickInBar > barFraction)
return QList<std::pair<ReducedFraction, TDuration>>();
const auto divInfo = divisionInfo(barFraction, tupletsInBar); // mectric structure of bar
const auto minDuration = MChord::minAllowedDuration() * 2; // >= minAllowedDuration() after subdivision
std::map<ReducedFraction, Node> nodes; // <onTime, Node>
{
int level = levelOfTick(startTickInBar, divInfo);
nodes.insert({startTickInBar, Node(level, level)});
level = levelOfTick(endTickInBar, divInfo);
nodes.insert({endTickInBar, Node(level, level)});
}
QQueue<std::pair<ReducedFraction, ReducedFraction>> gapsToProcess;
gapsToProcess.enqueue({startTickInBar, endTickInBar});
while (!gapsToProcess.isEmpty()) {
const auto gap = gapsToProcess.dequeue();
// don't split gap if its duration is less than minDuration
if (gap.second - gap.first < minDuration)
continue;
const auto splitPoint = findMaxLevelBetween(gap.first, gap.second, divInfo);
// sum levels if there are several positions (beats) with max level value
// for example, 8th + half duration + 8th in 3/4, and half is over two beats
if (splitPoint.pos == ReducedFraction(-1, 1)) // undefined
continue;
const int effectiveLevel = splitPoint.level + splitPoint.levelCount - 1;
const Node &startNode = nodes.find(gap.first)->second;
const Node &endNode = nodes.find(gap.second)->second;
if (badLevelCondition(effectiveLevel - startNode.edgeLevel,
effectiveLevel - endNode.edgeLevel, 0)
|| is2of3RestInTripleMeter(gap.first, gap.second, barFraction)
|| (durationType == DurationType::REST
&& is23EndOfBeatInCompoundMeter(gap.first, gap.second, barFraction)))
{
const int edgeLevel = adjustEdgeLevelIfTuplet(splitPoint, divInfo);
// split gap in splitPoint position
nodes.insert({splitPoint.pos, Node(edgeLevel, effectiveLevel)});
gapsToProcess.enqueue({gap.first, splitPoint.pos});
gapsToProcess.enqueue({splitPoint.pos, gap.second});
}
}
const int tol = (durationType == DurationType::NOTE) ? 1 : 0;
excludeNodes(nodes, tol, useDots);
return collectDurations(nodes, tupletsInBar, useDots, printRestRemains);
}
} // namespace Meter
} // namespace Ms