52 lines
1.7 KiB
TypeScript
52 lines
1.7 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import {
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MAIN_PHRASE_BARS,
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MUSIC_BAR_SECONDS,
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INTRO_IN_END_SECONDS,
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SOUNDTRACK_SAMPLE_RATE,
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mainPhraseOffsetSeconds,
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nextSafeBarTime,
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resolveInitialPlayback,
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} from '@/audio/soundtrack-transport';
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describe('soundtrack transport decisions', () => {
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it('starts at the intro only on Start and otherwise chooses the matching main phrase', () => {
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expect(resolveInitialPlayback({
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atStart: true,
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bias: 'open',
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entryPhrase: 0,
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intensity: 0,
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})).toEqual({ kind: 'intro' });
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expect(resolveInitialPlayback({
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atStart: false,
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bias: 'shadow',
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entryPhrase: 3,
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intensity: 0.5,
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})).toEqual({ kind: 'main', offsetSeconds: mainPhraseOffsetSeconds(3) });
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expect(mainPhraseOffsetSeconds(Number.NaN)).toBe(0);
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const finalPhraseSample = Math.round(
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7 * MAIN_PHRASE_BARS * MUSIC_BAR_SECONDS * SOUNDTRACK_SAMPLE_RATE,
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);
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expect(mainPhraseOffsetSeconds(99)).toBe(finalPhraseSample / SOUNDTRACK_SAMPLE_RATE);
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});
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it('coalesces an exit onto the next bar with enough time for a clean crossfade', () => {
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const anchorTime = 1;
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const now = anchorTime + MUSIC_BAR_SECONDS * 2 + 0.1;
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const transitionTime = nextSafeBarTime(now, anchorTime, 0.25);
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expect(transitionTime).toBeCloseTo(anchorTime + MUSIC_BAR_SECONDS * 3, 8);
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expect(transitionTime).toBeGreaterThanOrEqual(now + 0.25);
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expect(nextSafeBarTime(anchorTime, anchorTime, 0)).toBe(anchorTime);
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const earliestIntroExit = nextSafeBarTime(
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anchorTime + INTRO_IN_END_SECONDS - 0.35,
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anchorTime,
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0.35,
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);
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expect(earliestIntroExit).toBeCloseTo(anchorTime + MUSIC_BAR_SECONDS * 2, 8);
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});
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});
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