Caption Highlight

1"use client";
2 
3import { Timegroup } from "@editframe/react";
4import type { CSSProperties } from "react";
5 
6export interface CaptionWord {
7  text: string;
8  start: number;
9  end: number;
10}
11 
12export interface CaptionHighlightProps {
13  words?: CaptionWord[];
14  wordsPerGroup?: number;
15  color?: string;
16  highlightColor?: string;
17  fontSize?: number;
18  fontWeight?: number | string;
19  background?: string;
20  speed?: number;
21  fps?: number;
22  durationInFrames?: number;
23  width?: number;
24  height?: number;
25  className?: string;
26}
27 
28const DEFAULT_WORDS: CaptionWord[] = [
29  { end: 0.35, start: 0, text: "Every" },
30  { end: 0.65, start: 0.35, text: "great" },
31  { end: 1, start: 0.65, text: "video" },
32  { end: 1.45, start: 1.1, text: "starts" },
33  { end: 1.65, start: 1.45, text: "with" },
34  { end: 1.8, start: 1.65, text: "a" },
35  { end: 2.15, start: 1.8, text: "single" },
36  { end: 2.7, start: 2.15, text: "frame." },
37  { end: 3.2, start: 3, text: "No" },
38  { end: 3.9, start: 3.2, text: "timelines." },
39  { end: 4.2, start: 4, text: "No" },
40  { end: 4.5, start: 4.2, text: "drag" },
41  { end: 4.65, start: 4.5, text: "and" },
42  { end: 5.1, start: 4.65, text: "drop." },
43  { end: 5.55, start: 5.3, text: "Just" },
44  { end: 6, start: 5.55, text: "code." },
45];
46 
47export const CaptionHighlight = ({
48  words = DEFAULT_WORDS,
49  wordsPerGroup = 3,
50  color = "#ffffff",
51  highlightColor = "#ff1745",
52  fontSize = 72,
53  fontWeight = 800,
54  background = "#0a0a0a",
55  speed = 1,
56  fps = 30,
57  durationInFrames = 180,
58  width = 1280,
59  height = 720,
60  className,
61}: CaptionHighlightProps) => {
62  const safeSpeed = Math.max(0.01, speed);
63  const durationMs = (durationInFrames / fps) * 1000;
64 
65  const groups = [];
66  for (let i = 0; i < words.length; i += wordsPerGroup) {
67    const groupWords = words.slice(i, i + wordsPerGroup);
68    groups.push({
69      endMs: ((groupWords.at(-1)?.end ?? 0) * 1000) / safeSpeed + 180,
70      startMs: (groupWords[0].start * 1000) / safeSpeed,
71      words: groupWords,
72    });
73  }
74 
75  const containerStyle: CSSProperties = {
76    background,
77    height,
78    overflow: "hidden",
79    position: "relative",
80    width,
81  };
82 
83  return (
84    <Timegroup
85      className={className}
86      duration={`${durationMs}ms`}
87      mode="fixed"
88      style={containerStyle}
89    >
90      <>
91        <style>{`
92          @keyframes framecn-ch-grp-in {
93            from { opacity: 0; transform: translateY(14px); }
94            to   { opacity: 1; transform: translateY(0); }
95          }
96// … truncated