完成了对记忆功能的升级

src/app/(features)/srt-player/subtitle.ts

@@ -0,0 +1,74 @@
+export function parseSrt(data: string) {
+  const lines = data.split(/\r?\n/);
+  const result = [];
+  const re = new RegExp(
+    "(\\d{2}:\\d{2}:\\d{2},\\d{3})\\s*-->\\s*(\\d{2}:\\d{2}:\\d{2},\\d{3})",
+  );
+  let i = 0;
+  while (i < lines.length) {
+    if (!lines[i].trim()) {
+      i++;
+      continue;
+    }
+    i++;
+    if (i >= lines.length) break;
+    const timeMatch = lines[i].match(re);
+    if (!timeMatch) {
+      i++;
+      continue;
+    }
+    const start = toSeconds(timeMatch[1]);
+    const end = toSeconds(timeMatch[2]);
+    i++;
+    let text = "";
+    while (i < lines.length && lines[i].trim()) {
+      text += lines[i] + "\n";
+      i++;
+    }
+    result.push({ start, end, text: text.trim() });
+    i++;
+  }
+  return result;
+}
+
+export function getNearistIndex(
+  srt: { start: number; end: number; text: string }[],
+  ct: number,
+) {
+  for (let i = 0; i < srt.length; i++) {
+    const s = srt[i];
+    const l = ct - s.start >= 0;
+    const r = ct - s.end >= 0;
+    if (!(l || r)) return i - 1;
+    if (l && !r) return i;
+  }
+}
+
+export function getIndex(
+  srt: { start: number; end: number; text: string }[],
+  ct: number,
+) {
+  for (let i = 0; i < srt.length; i++) {
+    if (ct >= srt[i].start && ct <= srt[i].end) {
+      return i;
+    }
+  }
+  return null;
+}
+
+export function getSubtitle(
+  srt: { start: number; end: number; text: string }[],
+  currentTime: number,
+) {
+  return (
+    srt.find((sub) => currentTime >= sub.start && currentTime <= sub.end) ||
+    null
+  );
+}
+
+function toSeconds(timeStr: string): number {
+  const [h, m, s] = timeStr.replace(",", ".").split(":");
+  return parseFloat(
+    (parseInt(h) * 3600 + parseInt(m) * 60 + parseFloat(s)).toFixed(3),
+  );
+}