khodowany
104 lines
5.6 KiB
Python
104 lines
5.6 KiB
Python
from __future__ import annotations
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import dataclasses
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import fractions
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import generator.fretboard
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import generator.harmony
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import generator.model
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import generator.scales.selection
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import generator.scales.timeline
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import generator.solo.analysis
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import generator.solo.planning
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import generator.solo.policy
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import generator.solo.realization
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import generator.solo.types
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def compose(analysis, measures, part, end, *, scales, sequences, rhythms, initial=None):
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timeline = generator.scales.timeline.read({'measures': measures}, initial=initial)
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region = generator.scales.timeline.Solo(fractions.Fraction(), end, part.capitalize() + ' Solo')
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choices = generator.scales.selection.select(timeline, region, scales)
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for choice in choices:
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if choice.span.chord and choice.scale is None:
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raise ValueError(f'{part} solo, source measure {choice.span.source_measure}, beat {choice.span.beat}, {generator.harmony.symbol(choice.span.chord)}: No exact match within the permitted catalog')
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plans = generator.solo.planning.plans(analysis, measures, choices, end, part, sequences)
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retained = tuple((plan.start + n.start, plan.start + n.end, {n.pitch.number() % 12}) for plan in plans if plan.treatment in ('quote', 'exact_quote') for n in plan.motif.notes)
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if retained and not all(pc <= generator.solo.types.permitted(choices, start, finish) for start, finish, pc in retained):
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choices = generator.scales.selection.select(timeline, region, scales, retained=retained)
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if not all(pc <= generator.solo.types.permitted(choices, start, finish) for start, finish, pc in retained):
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raise ValueError(f'{part} solo: protected quotation has no exact compatible scale collection')
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choices = tuple(dataclasses.replace(c, reason=c.reason + '; retained quotation') if any(a < c.span.end and b > c.span.start for a, b, _ in retained) else c for c in choices)
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context = generator.solo.realization.SearchContext()
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def realize(plan, previous):
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return generator.solo.realization.alternatives(plan, measures, choices, sequences, rhythms, analysis.tempo, previous, context)
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phrases = choose_phrases(plans, realize)
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context.diagnostics['policy'] = generator.solo.policy.describe()['fingerprint']
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context.diagnostics['musical_identity'] = generator.solo.analysis.identity(analysis, measures, part)
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result = generator.solo.types.Solo(part, choices, tuple(phrases), analysis.tempo, end, context.diagnostics)
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validate(result)
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return result
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def phrase_notes(phrase):
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return generator.solo.types.sounding_notes(n for d in phrase.decisions for n in d.notes)
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def transition_cost(first, second):
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before, after = phrase_notes(first), phrase_notes(second)
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if not before or not after:
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return 0.0
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gap = max(0, after[0].start - before[-1].end - first.plan.release)
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jump = abs(after[0].pitch.number() - before[-1].pitch.number())
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# The next phrase's local score already includes physical movement. Here we
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# evaluate pacing and conversational contrast at the join, once per pair.
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before_shape = tuple(b.pitch.number() - a.pitch.number() for a, b in zip(before, before[1:]))
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after_shape = tuple(b.pitch.number() - a.pitch.number() for a, b in zip(after, after[1:]))
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repeated_answer = second.plan.relationship == 'answer' and before_shape == after_shape
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return min(1, float(gap) / 2) + 0.5 * min(1, max(0, jump - 5) / 12) + 0.5 * repeated_answer
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def choose_phrases(plans, realize):
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"""Commit only after the next phrase has been evaluated from each ending."""
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result, previous = [], None
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for index, plan in enumerate(plans):
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options = realize(plan, previous)
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ranked, failure = [], None
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for option in options:
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notes = phrase_notes(option)
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last = notes[-1] if notes else previous
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incoming = transition_cost(result[-1], option) if result else 0
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if index + 1 == len(plans):
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ranked.append((option.score + incoming, option))
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continue
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try:
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following = realize(plans[index + 1], last)
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except generator.solo.realization.SearchExhausted as error:
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failure = error
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continue
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length = float(option.plan.end - option.plan.start)
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next_length = float(plans[index + 1].end - plans[index + 1].start)
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cost = min((option.score * length + future.score * next_length) / (length + next_length) + transition_cost(option, future) for future in following)
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ranked.append((cost + incoming, option))
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if not ranked:
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raise failure or generator.solo.realization.SearchExhausted(f'{plan.id}: no feasible phrase transition')
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_, chosen = min(ranked, key=lambda item: (item[0], tuple((n.pitch, n.start, n.end, n.position) for n in phrase_notes(item[1]))))
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result.append(chosen)
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notes = phrase_notes(chosen)
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if notes:
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previous = notes[-1]
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return tuple(result)
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def validate(solo):
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previous = None
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for note in solo.notes():
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if note.start < 0 or note.end > solo.end or note.end <= note.start or previous and previous.end > note.start:
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raise ValueError(f'{solo.part} solo: overlapping or out-of-bounds note at {note.start}')
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if note.pitch.number() % 12 not in generator.solo.types.permitted(solo.choices, note.start, note.end):
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raise ValueError(f'{solo.part} solo: held pitch {note.pitch.label()} violates a scale span at {note.start}-{note.end}')
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if note.position not in generator.fretboard.positions_for_pitch(fractions.Fraction(note.pitch.number())):
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raise ValueError(f'{solo.part} solo: invalid guitar placement at {note.start}')
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previous = note
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for phrase in solo.phrases:
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notes = phrase_notes(phrase)
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if not generator.solo.realization.target_ok(notes, phrase.plan.target):
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raise ValueError(f'{phrase.plan.id}: planned harmonic arrival was not realized')
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