From aa36e63591c7b85a30bf0fae8cffcc42927daadd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E5=AE=8F=E6=9D=B0?=
 <zhanghongjie@xiaoxiajianji.com>
Date: Wed, 19 Aug 2026 20:33:16 +0800
Subject: [PATCH] =?UTF-8?q?refactor:=20=E6=B8=85=E7=90=86=20descriptionCac?=
 =?UTF-8?q?he=20=E5=85=9C=E5=BA=95=E4=BB=A3=E7=A0=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

删除 4 处 descriptionCache 相关代码：
- 删除 useRef 声明
- 删除缓存兜底块
- 删除缓存写入
- 删除缓存清理

descriptionCache 不再需要，description 直接由 extractCodecDescription 提供
---
 .../src/pages/generate/hooks/useCanvasPlayer.ts   | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
index 902f9d5c2..6fba99895 100644
--- a/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
+++ b/apps/web/src/pages/generate/hooks/useCanvasPlayer.ts
@@ -222,7 +222,6 @@ export function useCanvasPlayer(
   const videoDimRef = useRef<{ width: number; height: number }>({ width: 0, height: 0 })
   const isDestroyedRef = useRef(false)
   const lastProgressUpdateRef = useRef<number>(0)
-  const descriptionCache = useRef<Map<string, ArrayBuffer>>(new Map())
 
   // 计算总时长
   const totalDuration = segments.reduce((sum, seg) => sum + (seg.endTime - seg.startTime), 0)
@@ -336,15 +335,7 @@ export function useCanvasPlayer(
           }
 
           // 提取编解码器配置数据（HEVC 必需，H.264 也需要）
-          let description = extractCodecDescription(buffer)
-
-          // 如果当前分片没有 description，尝试从缓存获取
-          if (!description) {
-            for (const cached of descriptionCache.current.values()) {
-              description = cached
-              break
-            }
-          }
+          const description = extractCodecDescription(buffer)
 
           // ✅ 如果 description 缺失，无法解码 HEVC
           if (!description) {
@@ -357,9 +348,6 @@ export function useCanvasPlayer(
             return
           }
 
-          // 缓存 description 供后续分片使用
-          descriptionCache.current.set(segment.assetId, description)
-
           meta = {
             assetId: segment.assetId,
             videoUrl: segment.videoUrl,
@@ -713,7 +701,6 @@ export function useCanvasPlayer(
     frameQueueRef.current.clear()
     segmentDataRef.current.clear()
     segmentMetaRef.current = []
-    descriptionCache.current.clear()
   }, [])
 
   // ── 预加载下一个片段的数据 ──