khodowany
76 lines
4.2 KiB
Python
76 lines
4.2 KiB
Python
"""One learned accompaniment per instrument, reused at authored form positions."""
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from __future__ import annotations
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import copy
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import fractions
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import generator.accompaniment
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import generator.acoustic
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import generator.acoustic_voicing
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import generator.electric
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import generator.guitar
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import generator.fretboard
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import generator.model
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import generator.parts
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import generator.score
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import generator.arrange.form
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import generator.arrange.pickup
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def harmonic_key(measure, previous):
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def key(chord):
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return repr({k: chord.get(k) for k in ('root', 'kind', 'degrees', 'bass', 'inversion')}) if chord else ''
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active = generator.accompaniment.active_chord(measure, fractions.Fraction(), previous)
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return (key(active), tuple((generator.model.fraction(h['onset']), key(h)) for h in measure['harmonies']
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if generator.model.fraction(h['onset']) > 0), measure['duration'], measure['time_signature'])
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def audit(source, documents):
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"""Compare music, not generated IDs, at every reused form position."""
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authored = generator.score.source_staff(source)['measures']
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result = {}
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for part, document in documents.items():
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if part == 'vocal':
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continue
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sections = generator.arrange.form.full_arrangement_sections(authored, part)
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entry_positions = {s.source_measure_index for s in sections if s.role == 'accompaniment'}
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measures = document['staves'][0]['measures']
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carried = generator.accompaniment.carried_chords(measures)
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seen, exceptions, offset, reused = {}, [], 0, 0
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for si, section in enumerate(sections):
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following = sections[si + 1] if si + 1 < len(sections) else None
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for j in range(section.measure_count):
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if section.role != 'accompaniment':
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continue
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m = measures[offset + j]
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if j == section.measure_count - 1 and following and following.role == 'melody' and generator.arrange.pickup.enters(following, authored):
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exceptions.append({'measure': m['number'], 'reason': 'protected melody pickup'})
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continue
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if j == section.measure_count - 1 and following and following.role == 'slash' and generator.score.body_start_measure_index(authored):
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exceptions.append({'measure': m['number'], 'reason': 'source-defined solo pickup allocation'})
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continue
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position = section.source_measure_index + j
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# A complete figure depends on both measures' effective harmony and
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# source-defined participation. Changed final turnarounds/pickups are
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# explicit contexts, not incidental changes between iterations.
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first = generator.score.body_start_measure_index(authored)
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block_start = first + 2 * ((position - first) // 2)
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neighbors = range(max(section.source_measure_index, block_start), min(section.source_measure_index + section.measure_count, block_start + 2))
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context = tuple(repr(harmonic_key(measures[offset + k - section.source_measure_index], carried[offset + k - section.source_measure_index])) for k in neighbors)
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boundary = following.role if following and block_start + 2 >= section.source_measure_index + section.measure_count and generator.score.body_start_measure_index(authored) and following.role in ('slash', 'melody') else ''
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key = (position, context, boundary)
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signature = tuple((v['id'], generator.model.fraction(n['onset']), generator.model.fraction(n['duration']),
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tuple((generator.model.pitch_number(p), generator.model.fraction(p['duration']), p['tablature']['string'], p['tablature']['fret'], bool(p.get('tie_from')) if position not in entry_positions or generator.model.fraction(n['onset']) else False) for p in n['pitches']))
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for v in m['voices'] for n in v['notes'] if n['pitches'])
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if key in seen:
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if signature != seen[key]:
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raise ValueError(f'{part}, arrangement measure {m["number"]}: canonical accompaniment changed')
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reused += 1
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else:
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if any(k[0] == key[0] for k in seen):
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exceptions.append({'measure': m['number'], 'reason': 'changed two-bar harmony, duration, or protected participation'})
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seen[key] = signature
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offset += section.measure_count
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result[part] = {'reused_bars': reused, 'distinct_form_bars': len(seen), 'exceptions': exceptions}
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return result
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