khodowany
93 lines
4.0 KiB
Python
93 lines
4.0 KiB
Python
from __future__ import annotations
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import fractions
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import pathlib
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import generator.fretboard
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import generator.model
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import generator.pitch
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import generator.score
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PART_TYPES = ('acoustic', 'electric', 'vocal')
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def source_paths(directory: pathlib.Path) -> list[pathlib.Path]:
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if not directory.is_dir():
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raise ValueError(f'performance source directory not found: {directory}')
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paths = sorted(directory.rglob('*.xml'))
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identities = {}
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for path in paths:
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if path.parent != directory:
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raise ValueError(f'{path}: performance sources belong directly under data/songs')
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identity = generator.score.slugify(path.stem)
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if identity in identities:
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raise ValueError(f'{identities[identity]} and {path}: conflicting output path {identity}_acoustic.json')
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identities[identity] = path
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return paths
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def prepare_document(document: dict) -> dict:
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validate_source(document)
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return generator.pitch.concert_document(document, octave_transposing=True)
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def generated_voice(measure: dict, role: str) -> list[dict]:
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length = generator.model.fraction(measure['duration'])
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if role == 'rest':
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return [generator.model.make_event('rest', fractions.Fraction(), length, 'rest', written={'type': 'whole', 'dots': 0}) | {'measure_rest': True}]
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if role != 'slash':
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raise ValueError(f'{role} requires a preplanned rhythm')
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events = []
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states = [(fractions.Fraction(), measure['meter'])]
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states.extend((generator.model.fraction(a['onset']), a['meter']) for a in measure.get('attributes', []) if 'meter' in a)
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for index, (onset, meter) in enumerate(states):
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end = states[index + 1][0] if index + 1 < len(states) else length
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beats = generator.model.beat_lengths(meter)
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beat_index = 0
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while onset < end:
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duration = min(beats[beat_index % len(beats)] if beats else end - onset, end - onset)
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event = generator.model.make_event(f'slash_{len(events)}', onset, duration, 'note')
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event['notehead'] = 'slash'
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events.append(event)
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onset += duration
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beat_index += 1
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return events
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def validate_source(document: dict) -> None:
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for measure in generator.score.source_staff(document)['measures']:
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for state in [measure, *measure.get('attributes', [])]:
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if state.get('clef', {}).get('sign') in ('TAB', 'percussion'):
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raise ValueError(f'{measure["id"]}: parts require a pitched, non-TAB source')
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if 'staff_details' in state:
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generator.fretboard.validate_tuning(state, measure['id'])
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for voice in measure['voices']:
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for note in voice['notes']:
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if any('tablature' in p or 'unpitched' in p for p in note['pitches']):
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raise ValueError(f'{measure["id"]}: authored TAB and percussion are unsupported')
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def build_measure(source: dict, identifier: str, role: str, part: str, previous: dict | None, label: str = '') -> dict:
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voices = generator.score.copy_source_voices(source, strip_lyrics=role == 'melody') if role in ('vocal', 'melody') else None
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if voices:
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notes = [note for voice in voices for note in voice['notes']]
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else:
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notes = generated_voice(source, role)
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if role in ('melody', 'vocal'):
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for note in notes:
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octaves = 2 if role == 'melody' else 1
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note['pitches'] = [generator.pitch.shift_pitch(p, 7 * octaves, 12 * octaves) for p in note['pitches']]
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if role == 'melody':
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note['_melody'] = True
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result = generator.score.make_measure(identifier, source, [] if voices else notes, section_label=label)
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if voices:
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result['voices'] = voices
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result['transpose'] = {'diatonic': 0, 'chromatic': 0, 'octave_change': -1, 'explicit': True}
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result['clef']['octave_change'] = 0
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for change in result.get('attributes', []):
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change.pop('transpose', None)
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if 'clef' in change:
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change['clef']['octave_change'] = 0
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if part != 'vocal':
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result['clef'] = {'sign': 'G', 'line': 2, 'octave_change': 0}
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result['staff_details'] = {'lines': 5, 'tunings': [], 'capo': 0}
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for change in result.get('attributes', []):
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change.pop('clef', None)
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change.pop('staff_details', None)
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return result
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