native-lyrics-tools/src/utils.js

A JavaScript library for parsing and generating various lyric formats.

const MAX_TIME = 60039999; // 999:99.999

export function processLyrics(lines) {
  lines.sort((a, b) => {
    const aTime = a.words?.[0]?.start_time ?? 0;
    const bTime = b.words?.[0]?.start_time ?? 0;
    return aTime - bTime;
  });

  for (const line of lines) {
    const firstWord = line.words[0];
    const lastWord = line.words[line.words.length - 1];

    line.start_time = Math.min(firstWord?.start_time ?? 0, MAX_TIME);
    line.end_time = Math.min(lastWord?.end_time ?? 0, MAX_TIME);

    for (const word of line.words) {
      word.start_time = Math.min(word.start_time, MAX_TIME);
      word.end_time = Math.min(word.end_time, MAX_TIME);
    }
  }
}