fix: subtitle

src/subtitle/vtt.js

@@ -0,0 +1,44 @@
+function millisecondsStringToNumber(msString) {
+  const cleanString = msString.trim();
+  const milliseconds = parseInt(cleanString, 10);
+
+  if (isNaN(milliseconds)) {
+    return 0;
+  }
+
+  return milliseconds;
+}
+
+export function parseBilingualVtt(vttText) {
+  const cleanText = vttText.replace(/^\uFEFF/, "").trim();
+  const cues = cleanText.split(/\n\n+/);
+
+  const result = [];
+
+  for (const cue of cues) {
+    if (!cue.includes("-->")) continue;
+
+    const lines = cue.split("\n");
+
+    const timestampLineIndex = lines.findIndex((line) => line.includes("-->"));
+    if (timestampLineIndex === -1) continue;
+
+    const [startTimeString, endTimeString] =
+      lines[timestampLineIndex].split(" --> ");
+    const textLines = lines.slice(timestampLineIndex + 1);
+
+    if (startTimeString && endTimeString && textLines.length > 0) {
+      const originalText = textLines[0].trim();
+      const translatedText = (textLines[1] || "").trim();
+
+      result.push({
+        start: millisecondsStringToNumber(startTimeString),
+        end: millisecondsStringToNumber(endTimeString),
+        text: originalText,
+        translation: translatedText,
+      });
+    }
+  }
+
+  return result;
+}