初始提交：短剧库源码（含转码优化 ultrafast）

2026-09-17 19:09:08 +08:00
commit 07dc0f1059
247 changed files with 43242 additions and 0 deletions
@@ -0,0 +1,60 @@
+(() => {
+  function playbackSession({request, onState, onExpired, onError, interval = 20000, timeout = 8000, retry = 5000}) {
+    let session = '', timer = null, pending = null, ended = false;
+    function stop() {
+      session = '';
+      ended = false;
+      clearTimeout(timer);
+      timer = null;
+      const previous = pending;
+      pending = null;
+      previous?.controller.abort();
+    }
+    function schedule(delay) {
+      clearTimeout(timer);
+      if (session && !ended) timer = setTimeout(() => ping(), delay);
+    }
+    function ping(fresh = false) {
+      if (!session || ended) return Promise.resolve(null);
+      if (pending && !fresh) return pending.promise;
+      if (pending) {
+        const previous = pending;
+        pending = null;
+        previous.controller.abort();
+      }
+      clearTimeout(timer);
+      const call = {session, controller: new AbortController()};
+      pending = call;
+      call.promise = (async () => {
+        let deadline, delay = interval;
+        try {
+          const expiry = new Promise((_, reject) => {
+            deadline = setTimeout(() => {call.controller.abort(); reject(new Error('播放保活请求超时'));}, timeout);
+          });
+          const state = await Promise.race([Promise.resolve().then(() => request(call.session, call.controller.signal)), expiry]);
+          if (pending !== call || session !== call.session) return null;
+          onState(state);
+          return state;
+        } catch (error) {
+          if (pending !== call || session !== call.session) return null;
+          if (error.status === 410) {
+            ended = true;
+            onExpired(error);
+          } else if (error.status === 401 || error.status === 403) {
+            ended = true;
+            onError(error);
+          } else delay = retry;
+          return null;
+        } finally {
+          clearTimeout(deadline);
+          if (pending === call) {pending = null; schedule(delay);}
+        }
+      })();
+      return call.promise;
+    }
+    function start(id) {stop(); session = id; schedule(interval);}
+    return {start, stop, ping};
+  }
+  if (typeof module === 'object' && module.exports) module.exports = playbackSession;
+  else window.JukuPlaybackSession = playbackSession;
+})();