khodowany
105 lines
5.4 KiB
Python
105 lines
5.4 KiB
Python
from __future__ import annotations
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import copy
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from fractions import Fraction
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from pathlib import Path
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from generator.arrange.form import full_arrangement_sections
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from generator.guitar import place_guitar
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from generator.parts import PART_TYPES, build_measure, propagated_chords, validate_source
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from generator.model import fraction, key_label, make_event, meter_label, rational
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from generator.musicxml import load_musicxml
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from generator.pitch import concert_document
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from generator.score import copy_source_voices, make_arranged_document, reidentify, slugify, source_staff, write_json
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FINAL_SECTION_INDEX = 6
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def arrange_document(document: dict, part_type: str) -> dict:
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if part_type not in PART_TYPES:
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raise ValueError(f'unknown arrangement part: {part_type}')
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validate_source(document)
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document = concert_document(document, octave_transposing=True)
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staff = source_staff(document)
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source = staff['measures']
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sections = full_arrangement_sections(source, part_type)
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output, tuplets, octave_shifts = [], [], []
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absolute = Fraction()
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source_starts = []
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source_time = Fraction()
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for m in source:
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source_starts.append(source_time)
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source_time += fraction(m['duration'])
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for section in sections:
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previous = propagated_chords(source, include_optional=section.section_index != FINAL_SECTION_INDEX)
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segment = []
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for si in range(section.source_measure_index, section.source_measure_index + section.measure_count):
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m = copy.deepcopy(source[si])
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m['harmonies'] = [h for h in m['harmonies'] if section.section_index != FINAL_SECTION_INDEX or not h.get('chord_optional')]
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for h in m['harmonies']:
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h.pop('chord_optional', None)
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result = build_measure(m, f'measure-{len(output) + len(segment) + 1}', section.role, part_type, previous[si], section.label if not segment else '')
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segment.append(result)
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identity_segment = segment
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segment_length = sum((fraction(m['duration']) for m in segment), Fraction())
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if section.role in ('vocal', 'melody'):
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start = source_starts[section.source_measure_index]
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for shift in staff.get('octave_shifts', []):
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low, high = max(start, fraction(shift['start'])), min(start + segment_length, fraction(shift['end']))
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if low < high:
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octave_shifts.append({**shift, 'id': f'section-{section.section_index}-{shift["id"]}', 'start': rational(absolute + low - start), 'end': rational(absolute + high - start)})
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if part_type == 'vocal' and section.section_index in (1, 5) and section.source_measure_index == 1 and source[0].get('implicit') and output:
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pickup = build_measure(source[0], source[0]['id'], 'vocal', part_type, None)
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destination = output[-1]
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pad = fraction(destination['duration']) - fraction(pickup['duration'])
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if pad < 0:
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raise ValueError('pickup is longer than the preceding arrangement measure')
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voices = copy_source_voices(pickup, strip_lyrics=False)
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for voice in voices:
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for n in voice['notes']:
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n['onset'] = rational(fraction(n['onset']) + pad)
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if pad:
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voice['notes'].insert(0, make_event(f'pickup-rest-{voice["id"]}', Fraction(), pad, 'rest') | {'voice': voice['id']})
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destination['voices'] = voices
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identity_segment = [destination, *segment]
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if pickup['harmonies']:
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destination['harmonies'] = [h for h in destination['harmonies'] if fraction(h['onset']) < pad]
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for h in pickup['harmonies']:
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h['onset'] = rational(fraction(h['onset']) + pad)
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destination['harmonies'].append(h)
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state = {k: copy.deepcopy(pickup[k]) for k in ('key', 'clef', 'meter', 'transpose')}
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if pad:
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destination['attributes'].append({'onset': rational(pad), **state})
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else:
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destination.update(state)
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destination['key_signature'] = key_label(state['key'])
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destination['time_signature'] = meter_label(state['meter'])
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for change in pickup.get('attributes', []):
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destination['attributes'].append({**change, 'onset': rational(fraction(change['onset']) + pad)})
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for shift in staff.get('octave_shifts', []):
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low, high = fraction(shift['start']), min(fraction(pickup['duration']), fraction(shift['end']))
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if low < high:
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offset = absolute - fraction(pickup['duration'])
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octave_shifts.append({**shift, 'id': f'pickup-{section.section_index}-{shift["id"]}', 'start': rational(offset + low), 'end': rational(offset + high)})
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tuplets.extend(reidentify(identity_segment, staff.get('tuplets', [])))
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output.extend(segment)
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absolute += segment_length
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result = make_arranged_document(document, staff, staff_id='staff-arranged-' + part_type, staff_name=part_type.capitalize(), role='vocal' if part_type == 'vocal' else 'guitar', arrangement_part_type=part_type, measures=output, tuplets=tuplets, octave_shifts=octave_shifts)
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result['metadata'].setdefault('tempo', 124)
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if part_type != 'vocal':
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place_guitar(result)
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return result
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def generate_performance_scores(source_dir: Path, output_dir: Path) -> int:
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if not source_dir.exists():
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raise ValueError(f'performance source directory not found: {source_dir}')
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count = 0
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for path in sorted(source_dir.glob('*.xml')):
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document = load_musicxml(path)
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for part in PART_TYPES:
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try:
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write_json(output_dir / f'{slugify(path.stem)}-{part}.json', arrange_document(document, part))
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except ValueError as error:
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raise ValueError(f'{path}, part {part}: {error}') from error
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count += 1
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return count
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