feat: 支持长按右键/D键二倍速播放与视频AB循环

Co-authored-by: Cursor <cursoragent@cursor.com>

app/aweme/[awemeId]/hooks/useImageCarousel.ts

@@ -31,6 +31,7 @@ function sumDurations(durations: number[], end: number): number {
 interface UseImageCarouselProps {
   images: ImageData["images"];
   isPlaying: boolean;
+  playbackRate?: number;
   loopMode: LoopMode;
   neighbors: Neighbors;
   volume: number;
@@ -63,6 +64,7 @@ export interface UseImageCarouselReturn {
 export function useImageCarousel({
   images,
   isPlaying,
+  playbackRate = 1,
   loopMode,
   neighbors,
   volume,
@@ -375,8 +377,10 @@ export function useImageCarousel({
       return;
     }
 
+    const safeRate = playbackRate > 0 ? playbackRate : 1;
     const now = performance.now();
-    const currentSegmentDuration = segmentDurations[idx] ?? fallbackDuration;
+    const currentSegmentDuration =
+      (segmentDurations[idx] ?? fallbackDuration) / safeRate;
     segStartRef.current = now - segProgressRef.current * currentSegmentDuration;
 
     const tick = (): void => {
@@ -386,7 +390,8 @@ export function useImageCarousel({
       const ts = performance.now();
       const start = segStartRef.current ?? ts;
       const activeIdx = idxRef.current;
-      const duration = segmentDurations[activeIdx] ?? fallbackDuration;
+      const duration =
+        (segmentDurations[activeIdx] ?? fallbackDuration) / safeRate;
       const elapsed = ts - start;
 
       if (elapsed >= duration) {
@@ -416,6 +421,7 @@ export function useImageCarousel({
     isCurrentAnimated,
     isCurrentStaticReady,
     isPlaying,
+    playbackRate,
     segmentDurations,
     syncProgress,
     totalDurationMs,