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import type { TranscriptionSegment, CaptionChunk } from "@/lib/transcription/types";
import {
DEFAULT_WORDS_PER_CAPTION,
MIN_CAPTION_DURATION_SECONDS,
} from "@/lib/transcription/caption-defaults";
export function buildCaptionChunks({
segments,
wordsPerChunk = DEFAULT_WORDS_PER_CAPTION,
minDuration = MIN_CAPTION_DURATION_SECONDS,
}: {
segments: TranscriptionSegment[];
wordsPerChunk?: number;
minDuration?: number;
}): CaptionChunk[] {
const captions: CaptionChunk[] = [];
let globalEndTime = 0;
for (const segment of segments) {
const words = segment.text.trim().split(/\s+/);
if (words.length === 0 || (words.length === 1 && words[0] === "")) continue;
const segmentDuration = segment.end - segment.start;
const wordsPerSecond = words.length / segmentDuration;
const chunks: string[] = [];
for (let i = 0; i < words.length; i += wordsPerChunk) {
chunks.push(words.slice(i, i + wordsPerChunk).join(" "));
}
let chunkStartTime = segment.start;
for (const chunk of chunks) {
const chunkWords = chunk.split(/\s+/).length;
const chunkDuration = Math.max(minDuration, chunkWords / wordsPerSecond);
const adjustedStartTime = Math.max(chunkStartTime, globalEndTime);
captions.push({
text: chunk,
startTime: adjustedStartTime,
duration: chunkDuration,
});
globalEndTime = adjustedStartTime + chunkDuration;
chunkStartTime += chunkDuration;
}
}
return captions;
}
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