67 lines
1.5 KiB
TypeScript
67 lines
1.5 KiB
TypeScript
/**
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* 字幕数据类型定义和处理工具
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*/
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export interface WordTimestamp {
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word: string;
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start: number;
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end: number;
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}
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export interface Segment {
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text: string;
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start: number;
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end: number;
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words: WordTimestamp[];
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}
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export interface CaptionsData {
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segments: Segment[];
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}
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/**
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* 根据当前时间获取应该显示的字幕段落
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*/
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export function getCurrentSegment(
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captions: CaptionsData,
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currentTimeInSeconds: number
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): Segment | null {
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for (const segment of captions.segments) {
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if (currentTimeInSeconds >= segment.start && currentTimeInSeconds <= segment.end) {
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return segment;
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}
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}
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return null;
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}
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/**
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* 根据当前时间获取当前高亮的字的索引
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*/
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export function getCurrentWordIndex(
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segment: Segment,
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currentTimeInSeconds: number
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): number {
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for (let i = 0; i < segment.words.length; i++) {
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const word = segment.words[i];
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if (currentTimeInSeconds >= word.start && currentTimeInSeconds <= word.end) {
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return i;
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}
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// 如果当前时间在两个字之间，返回前一个字
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if (i < segment.words.length - 1) {
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const nextWord = segment.words[i + 1];
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if (currentTimeInSeconds > word.end && currentTimeInSeconds < nextWord.start) {
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return i;
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}
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}
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}
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// 如果超过最后一个字的结束时间，返回最后一个字
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if (segment.words.length > 0) {
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const lastWord = segment.words[segment.words.length - 1];
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if (currentTimeInSeconds >= lastWord.end) {
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return segment.words.length - 1;
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}
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}
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return -1;
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}
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