refactor: restructure files to their domains, new preview overlay system, and dep graph

1 files changed, 49 insertions, 0 deletions

diff --git a/apps/web/src/transcription/caption.ts b/apps/web/src/transcription/caption.ts
new file mode 100644
index 00000000..8e6ae864
--- /dev/null
+++ b/apps/web/src/transcription/caption.ts
@@ -0,0 +1,49 @@
+import type { TranscriptionSegment, CaptionChunk } from "@/transcription/types";

+import {

+	DEFAULT_WORDS_PER_CAPTION,

+	MIN_CAPTION_DURATION_SECONDS,

+} from "@/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;

+}