Score and Note Deep Dive - VOICEVOX for Laravel

use Revolution\Voicevox\Song\Note;

$note = Note::make(
    length: 94,
    lyric: 'ド',
    key: 60,
    id: 'intro-1',
);

length = seconds × 93.75

Note::len(int $ticks, int $bpm = 125): int

Note::make(length: Note::len(480, 120), lyric: 'ド', key: 60);  // quarter note
Note::make(length: Note::len(960, 120), lyric: 'ミ', key: 64);  // half note

Note::make(length: 15, lyric: '', key: null);

use Revolution\Voicevox\Song\Score;

$score = Score::make([
    Note::make(length: 15, lyric: '', key: null),
    Note::make(length: Note::len(480, 120), lyric: 'ド', key: 60),
]);

$score = Score::make([
    Note::make(length: 15, lyric: '', key: null),
]);

$score->add(Note::make(length: Note::len(480, 120), lyric: 'ド', key: 60));

$json = $score->toJson(JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);

{
  "teacher": 6000,
  "speaker": 3001,
  "bpm": 120,
  "notes": [
    { "ticks": 120, "lyric": "", "key": null, "id": "r0" },
    { "ticks": 480, "lyric": "ド", "key": 60, "id": "n1" },
    { "ticks": 480, "lyric": "レ", "key": 62, "id": "n2" },
    { "ticks": 960, "lyric": "ミ", "key": 64, "id": "n3" },
    { "ticks": 120, "lyric": "", "key": null, "id": "r1" }
  ]
}

use Illuminate\Support\Facades\Storage;
use Revolution\Voicevox\Song\Note;
use Revolution\Voicevox\Song\Score;
use Revolution\Voicevox\Voicevox;

$chart = json_decode(
    Storage::disk('local')->get('songs/sample.json'),
    true,
    flags: JSON_THROW_ON_ERROR,
);

$score = Score::make(
    collect($chart['notes'])
        ->map(fn (array $note) => Note::make(
            length: Note::len(ticks: $note['ticks'], bpm: $chart['bpm']),
            lyric: $note['lyric'] ?? '',
            key: $note['key'],
            id: $note['id'] ?? null,
        ))
        ->all(),
);

$response = Voicevox::song($score, teacher: $chart['teacher'])
    ->generate(id: $chart['speaker']);

$response->storeAs('songs', 'sample.wav');