初始化奇妙小屏幕控制器项目

2026-09-08 22:56:52 +08:00
commit 8d368de3b5
491 changed files with 67678 additions and 0 deletions
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+export const CURRENT_DISPLAY_SPEEDS = Object.freeze([0.5, 1, 1.5, 2]);
+
+export function formatPlaybackTime(valueMs) {
+  const milliseconds = Math.max(0, Math.floor(Number(valueMs) || 0));
+  const minutes = Math.floor(milliseconds / 60000);
+  const seconds = Math.floor((milliseconds % 60000) / 1000);
+  const hundredths = Math.floor((milliseconds % 1000) / 10);
+  return `${minutes}:${String(seconds).padStart(2, "0")}.${String(hundredths).padStart(2, "0")}`;
+}
+
+export function projectPlaybackPosition(playback, elapsedMs = 0) {
+  if (!playback?.active || !Number.isFinite(Number(playback.total_duration_ms))) return null;
+  const total = Math.max(1, Number(playback.total_duration_ms));
+  const base = Math.max(0, Number(playback.position_ms) || 0);
+  if (playback.paused) return Math.min(total - 1, base);
+  const speed = Number(playback.speed) || 1;
+  const projected = base + Math.max(0, Number(elapsedMs) || 0) * speed;
+  return Math.min(total - 1, projected % total);
+}
+
+export class LatestSeekDispatcher {
+  constructor(send, {
+    intervalMs = 100,
+    now = () => performance.now(),
+    setTimer = (callback, delay) => window.setTimeout(callback, delay),
+    clearTimer = (timer) => window.clearTimeout(timer),
+    onError = () => {},
+  } = {}) {
+    this.send = send;
+    this.intervalMs = intervalMs;
+    this.now = now;
+    this.setTimer = setTimer;
+    this.clearTimer = clearTimer;
+    this.onError = onError;
+    this.inFlight = false;
+    this.lastStartedAt = Number.NEGATIVE_INFINITY;
+    this.queued = null;
+    this.timer = null;
+  }
+
+  enqueue(positionMs, { flush = false } = {}) {
+    this.queued = { positionMs, flush: flush || Boolean(this.queued?.flush) };
+    this.#drain();
+  }
+
+  clear() {
+    this.queued = null;
+    if (this.timer !== null) this.clearTimer(this.timer);
+    this.timer = null;
+  }
+
+  #drain() {
+    if (this.inFlight || this.queued === null) return;
+    const waitMs = this.intervalMs - (this.now() - this.lastStartedAt);
+    if (!this.queued.flush && waitMs > 0) {
+      if (this.timer === null) {
+        this.timer = this.setTimer(() => {
+          this.timer = null;
+          this.#drain();
+        }, waitMs);
+      }
+      return;
+    }
+    if (this.timer !== null) this.clearTimer(this.timer);
+    this.timer = null;
+    const item = this.queued;
+    this.queued = null;
+    this.inFlight = true;
+    this.lastStartedAt = this.now();
+    Promise.resolve()
+      .then(() => this.send(item.positionMs))
+      .catch((error) => this.onError(error, item.positionMs))
+      .finally(() => {
+        this.inFlight = false;
+        this.#drain();
+      });
+  }
+}