forked from miao-moe/QZMusic_PC
110 lines
3.2 KiB
TypeScript
110 lines
3.2 KiB
TypeScript
/**
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* @fileoverview ASS 字幕格式导出。
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* 注意导出会损失 10ms 以内精度（按厘秒四舍五入）。
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*
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* 格式示例：
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* Dialogue: 0,0:00:12.34, 0:00:15.67, Default, v1,0,0,0,,{\k20}Hello{\k15} world
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* Dialogue: 0,0:00:12.34, 0:00:15.67, Default, v1-trans,0,0,0,,你好 世界
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* Dialogue: 0,0:00:12.34, 0:00:15.67, Default, v1-roman,0,0,0,,ni hao shi jie
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*/
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import type { LyricLine } from "../types";
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import { normalizeTimestamp } from "../utils";
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function writeASSTimestamp(ms: number): string {
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const normalized = normalizeTimestamp(ms);
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const milli = Math.round(normalized) % 1000;
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const secTotal = Math.floor(Math.round(normalized) / 1000);
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const sec = secTotal % 60;
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const minTotal = Math.floor(secTotal / 60);
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const hour = Math.floor(minTotal / 60);
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return `${hour}:${String(minTotal % 60).padStart(2, "0")}:${String(sec).padStart(2, "0")}.${String(Math.floor(milli / 10)).padStart(2, "0")}`;
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}
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function getSpeakerName(line: LyricLine): string {
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let name = line.isDuet ? "v2" : "v1";
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if (line.isBG) name += "-bg";
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return name;
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}
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function writeLyricDialogue(
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result: string[],
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startTime: number,
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endTime: number,
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name: string,
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text: string,
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) {
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result.push(
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`Dialogue: 0,${writeASSTimestamp(startTime)}, ${writeASSTimestamp(endTime)}, Default, ${name},0,0,0,,${text}`,
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);
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}
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/**
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* 将歌词数组转换为 ASS 字幕格式字符串
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* @param lines 歌词数组
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* @returns ASS 字幕格式字符串
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*/
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export function stringifyAss(lines: LyricLine[]): string {
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const result: string[] = [
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"[Script Info]",
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"[Events]",
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"Formats: Marked, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text",
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];
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for (const line of lines) {
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const timedWords = line.words
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.map((w) => ({
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...w,
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startTime: normalizeTimestamp(w.startTime),
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endTime: normalizeTimestamp(w.endTime),
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}))
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.filter((w) => w.endTime > w.startTime);
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const startTime = Math.min(...timedWords.map((w) => w.startTime));
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const endTime = Math.max(...timedWords.map((w) => w.endTime));
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if (!Number.isFinite(startTime) || !Number.isFinite(endTime)) continue;
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let lyricText = "";
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let previousWordEndTime = startTime;
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for (const word of line.words) {
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const wordStart = normalizeTimestamp(word.startTime);
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const wordEnd = normalizeTimestamp(word.endTime);
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if (wordStart >= wordEnd) {
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lyricText += word.word;
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continue;
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}
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if (wordStart > previousWordEndTime) {
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const gapDurationCS = Math.floor(
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(wordStart - previousWordEndTime + 5) / 10,
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);
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if (gapDurationCS > 0) lyricText += `{\\k${gapDurationCS}}`;
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}
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const wordDurationCS = Math.floor((wordEnd - wordStart + 5) / 10);
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if (wordDurationCS > 0) lyricText += `{\\k${wordDurationCS}}`;
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lyricText += word.word;
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previousWordEndTime = wordEnd;
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}
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const speaker = getSpeakerName(line);
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writeLyricDialogue(result, startTime, endTime, speaker, lyricText);
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if (line.translatedLyric)
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writeLyricDialogue(
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result,
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startTime,
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endTime,
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`${speaker}-trans`,
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line.translatedLyric,
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);
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if (line.romanLyric)
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writeLyricDialogue(
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result,
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startTime,
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endTime,
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`${speaker}-roman`,
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line.romanLyric,
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);
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}
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return `${result.join("\n")}\n`;
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}
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