khodowany
75 lines
3.5 KiB
Python
75 lines
3.5 KiB
Python
from __future__ import annotations
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import dataclasses
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import fractions
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import hashlib
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import generator.harmony
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import generator.model
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import generator.score
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import generator.solo.types
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@dataclasses.dataclass(frozen=True)
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class Analysis:
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motifs: tuple[generator.solo.types.Motif, ...]
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boundaries: tuple[fractions.Fraction, ...]
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tempo: fractions.Fraction
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melody: tuple[generator.solo.types.Note, ...]
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def attacks(document: dict) -> tuple[generator.solo.types.Note, ...]:
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"""Collapse tied tones before extracting monophonic melody fragments."""
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result, pending = [], {}
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absolute = fractions.Fraction()
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for measure in generator.score.source_staff(document)['measures']:
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for event in generator.score.measure_notes(measure):
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if event.get('grace') or event.get('cue'):
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continue
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for tone in event['pitches']:
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number = generator.model.pitch_number(tone)
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if number.denominator != 1:
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continue
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start = absolute + generator.model.fraction(event['onset'])
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end = start + generator.model.fraction(tone['duration'])
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pitch = generator.solo.types.Pitch(tone['letter'], generator.model.alteration(tone['alter']), tone['octave'])
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source = pending.pop(tone.get('tie_from'), None)
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if source is not None:
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result[source] = dataclasses.replace(result[source], end=end, sources=(*result[source].sources, event['id']))
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else:
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source = len(result)
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result.append(generator.solo.types.Note(start, end, pitch, (event['id'],)))
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if 'tie_to' in tone:
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pending[tone['id']] = source
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absolute += generator.model.fraction(measure['duration'])
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return tuple(sorted(result, key=lambda n: (n.start, -n.pitch.number(), n.sources)))
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def analyze(document: dict) -> Analysis:
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measures = generator.score.source_staff(document)['measures']
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melody = attacks(document)
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boundaries = [fractions.Fraction()]
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for measure in measures:
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boundaries.append(boundaries[-1] + generator.model.fraction(measure['duration']))
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tempo = next((generator.model.fraction(t['bpm']) * generator.model.written_length(t['written']) for m in measures for t in m.get('tempos', [])), fractions.Fraction(120))
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candidates = []
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for index, measure in enumerate(measures):
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start = boundaries[index]
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# One- and two-bar ideas retain leading silence and the complete held ending.
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for count in (1, 2):
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if index + count >= len(boundaries):
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continue
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end = boundaries[index + count]
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notes = tuple(n for n in melody if start <= n.start < end)
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if not notes or any(n.end > end for n in notes) or any(a.end > b.start for a, b in zip(notes, notes[1:])):
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continue
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if len(notes) > 8:
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continue
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normalized = tuple(dataclasses.replace(n, start=n.start - start, end=n.end - start) for n in notes)
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identity = repr(tuple((n.start, n.end, n.pitch) for n in normalized)).encode('ascii')
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identifier = 'head_' + hashlib.sha256(identity).hexdigest()[:12]
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context = tuple(generator.harmony.symbol(h) for m in measures[index:index + count] for h in m['harmonies'])
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candidates.append(generator.solo.types.Motif(identifier, normalized, end - start, context))
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unique = {m.id: m for m in reversed(candidates)}
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# Preserve the opening idea, then favor a contrasting rhythm/contour with space.
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ordered = list(unique.values())
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ordered.sort(key=lambda m: (next(i for i, n in enumerate(melody) if n.sources[0] == m.notes[0].sources[0]), m.duration))
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return Analysis(tuple(ordered), tuple(boundaries), tempo, melody)
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