优化，添加滚动记忆

internal/handler/danmaku_settings_test.go

@@ -112,7 +112,8 @@ func TestGetDanmakuConfigIncludesPerUserMergePreference(t *testing.T) {
 		t.Fatalf("status = %d, want 200", w.Code)
 	}
 	var cfg struct {
-		MergeSources bool `json:"merge_sources"`
+		MergeSources bool    `json:"merge_sources"`
+		PlaybackRate float64 `json:"playback_rate"`
 	}
 	if err := json.Unmarshal(w.Body.Bytes(), &cfg); err != nil {
 		t.Fatalf("decode: %v", err)
@@ -120,6 +121,9 @@ func TestGetDanmakuConfigIncludesPerUserMergePreference(t *testing.T) {
 	if cfg.MergeSources {
 		t.Fatal("default merge preference should be false")
 	}
+	if cfg.PlaybackRate != 1 {
+		t.Fatalf("default playback rate = %v, want 1", cfg.PlaybackRate)
+	}
 
 	if err := svc.Danmaku.SetMergeSources(t.Context(), "user-1", true); err != nil {
 		t.Fatalf("set: %v", err)
@@ -137,7 +141,7 @@ func TestGetDanmakuConfigIncludesPerUserMergePreference(t *testing.T) {
 func TestUpdateDanmakuSettingsPersistsAllPlayerPreferences(t *testing.T) {
 	svc := newDanmakuSettingsService(t)
 
-	body := "{\"enabled\":false,\"opacity\":0.6,\"font_size\":32,\"area\":0.7,\"merge_sources\":true,\"volume\":0.35,\"source\":\"https://dm.example/base/\",\"app_id\":\"my-app-id\",\"app_key\":\"my-app-secret\"}"
+	body := "{\"enabled\":false,\"opacity\":0.6,\"font_size\":32,\"area\":0.7,\"merge_sources\":true,\"volume\":0.35,\"playback_rate\":1.5,\"source\":\"https://dm.example/base/\",\"app_id\":\"my-app-id\",\"app_key\":\"my-app-secret\"}"
 	c, w := newDanmakuSettingsContext(t, svc, http.MethodPut, "/danmaku/settings", body, "user-1")
 	updateDanmakuSettingsHandler(svc)(c)
 
@@ -154,7 +158,7 @@ func TestUpdateDanmakuSettingsPersistsAllPlayerPreferences(t *testing.T) {
 	if cfg.Enabled || cfg.Opacity != "0.6" || cfg.FontSize != "32" || cfg.Area != "0.7" {
 		t.Fatalf("unexpected render config: %+v", cfg)
 	}
-	if !cfg.MergeSources || cfg.Volume != 0.35 {
+	if !cfg.MergeSources || cfg.Volume != 0.35 || cfg.PlaybackRate != 1.5 {
 		t.Fatalf("unexpected user preferences: %+v", cfg)
 	}
 	if cfg.Source != "https://dm.example/base" || cfg.AppID != "my-app-id" || !cfg.AppKeyConfigured {
@@ -165,11 +169,30 @@ func TestUpdateDanmakuSettingsPersistsAllPlayerPreferences(t *testing.T) {
 	if err != nil || user == nil {
 		t.Fatalf("read persisted user: %v", err)
 	}
-	if user.DanmakuAppKey != "my-app-secret" || user.PlayerVolume != 0.35 || user.DanmakuSource != "https://dm.example/base" {
+	if user.DanmakuAppKey != "my-app-secret" || user.PlayerVolume != 0.35 || user.PlayerPlaybackRate != 1.5 || user.DanmakuSource != "https://dm.example/base" {
 		t.Fatalf("preferences not persisted: %+v", user)
 	}
 }
 
+func TestUpdateDanmakuSettingsRejectsInvalidPlaybackRate(t *testing.T) {
+	svc := newDanmakuSettingsService(t)
+
+	c, w := newDanmakuSettingsContext(t, svc, http.MethodPut, "/danmaku/settings",
+		`{"playback_rate":4}`, "user-1")
+	updateDanmakuSettingsHandler(svc)(c)
+
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("status = %d, want 400 (body=%s)", w.Code, w.Body.String())
+	}
+	user, err := svc.Repo.User.FindByID(t.Context(), "user-1")
+	if err != nil || user == nil {
+		t.Fatalf("read user: %v", err)
+	}
+	if user.PlayerPlaybackRate != 1 {
+		t.Fatalf("invalid playback rate was persisted: %v", user.PlayerPlaybackRate)
+	}
+}
+
 func TestUpdateDanmakuSettingsRejectsInvalidSource(t *testing.T) {
 	svc := newDanmakuSettingsService(t)
 

internal/model/user.go

@@ -33,6 +33,7 @@ type User struct {
 	SubtitleChineseMode string `gorm:"size:16;not null;default:original" json:"subtitle_chinese_mode"`
 	// 网页播放器偏好按用户存储，切换媒体对象后继续沿用。
 	PlayerVolume        float64 `gorm:"not null;default:1" json:"player_volume"`
+	PlayerPlaybackRate  float64 `gorm:"not null;default:1" json:"player_playback_rate"`
 	DanmakuEnabled      bool    `gorm:"not null;default:true" json:"danmaku_enabled"`
 	DanmakuOpacity      float64 `gorm:"not null;default:1" json:"danmaku_opacity"`
 	DanmakuFontSize     int     `gorm:"not null;default:24" json:"danmaku_font_size"`

internal/service/danmaku_service.go

@@ -49,6 +49,12 @@ const (
 // dandanplay protocol (search/episodes + comment/{episodeId}) may be used.
 const DanmakuDefaultSource = "https://api.dandanplay.net"
 
+const (
+	minPlayerPlaybackRate     = 0.5
+	maxPlayerPlaybackRate     = 3.0
+	defaultPlayerPlaybackRate = 1.0
+)
+
 // danmakuOfficialBase is where identification (/api/v2/match) and the
 // comment/search fallback always go, regardless of the configured source.
 // A package var (not a const) so tests can point it at a local server.
@@ -63,6 +69,8 @@ type DanmakuRenderConfig struct {
 	FontSize string  `json:"font_size"`
 	Area     string  `json:"area"`
 	Volume   float64 `json:"volume"`
+	// PlaybackRate 是当前用户的播放倍速偏好（按用户存储）。
+	PlaybackRate float64 `json:"playback_rate"`
 	// MergeSources 是当前用户的弹幕合并偏好（按用户存储）。
 	MergeSources bool `json:"merge_sources"`
 	// AppKeyConfigured 只表明用户是否保存了应用密钥，不回传密钥明文。
@@ -89,6 +97,7 @@ type DanmakuSettingsPatch struct {
 	Area         *float64 `json:"area"`
 	MergeSources *bool    `json:"merge_sources"`
 	Volume       *float64 `json:"volume"`
+	PlaybackRate *float64 `json:"playback_rate"`
 }
 
 type danmakuUserContextKey struct{}
@@ -345,10 +354,11 @@ func cloneDanmakuAnimeList(in []DanmakuAnime) []DanmakuAnime {
 // Config reads danmaku settings from the runtime settings table.
 func (s *DanmakuService) Config(ctx context.Context) DanmakuRenderConfig {
 	cfg := DanmakuRenderConfig{
-		Opacity:  "1",
-		FontSize: "24",
-		Area:     "1",
-		Volume:   1,
+		Opacity:      "1",
+		FontSize:     "24",
+		Area:         "1",
+		Volume:       1,
+		PlaybackRate: defaultPlayerPlaybackRate,
 	}
 	if s == nil || s.repo == nil || s.repo.Setting == nil {
 		return cfg
@@ -399,7 +409,14 @@ func (s *DanmakuService) findUser(ctx context.Context, userID string) (*model.Us
 
 func danmakuConfigFromUser(user *model.User) DanmakuRenderConfig {
 	if user == nil {
-		return DanmakuRenderConfig{Enabled: true, Opacity: "1", FontSize: "24", Area: "1", Volume: 1}
+		return DanmakuRenderConfig{
+			Enabled:      true,
+			Opacity:      "1",
+			FontSize:     "24",
+			Area:         "1",
+			Volume:       1,
+			PlaybackRate: defaultPlayerPlaybackRate,
+		}
 	}
 	opacity := user.DanmakuOpacity
 	if opacity < 0.1 || opacity > 1 {
@@ -417,6 +434,10 @@ func danmakuConfigFromUser(user *model.User) DanmakuRenderConfig {
 	if volume < 0 || volume > 1 {
 		volume = 1
 	}
+	playbackRate := user.PlayerPlaybackRate
+	if playbackRate < minPlayerPlaybackRate || playbackRate > maxPlayerPlaybackRate {
+		playbackRate = defaultPlayerPlaybackRate
+	}
 	return DanmakuRenderConfig{
 		Enabled:          user.DanmakuEnabled,
 		Source:           strings.TrimSpace(user.DanmakuSource),
@@ -425,6 +446,7 @@ func danmakuConfigFromUser(user *model.User) DanmakuRenderConfig {
 		FontSize:         strconv.Itoa(fontSize),
 		Area:             strconv.FormatFloat(area, 'f', -1, 64),
 		Volume:           volume,
+		PlaybackRate:     playbackRate,
 		MergeSources:     user.DanmakuMergeSources,
 		AppKeyConfigured: strings.TrimSpace(user.DanmakuAppKey) != "",
 	}
@@ -495,6 +517,17 @@ func (s *DanmakuService) UpdateUserSettings(ctx context.Context, userID string,
 		}
 		updates["player_volume"] = *patch.Volume
 	}
+	if patch.PlaybackRate != nil {
+		if *patch.PlaybackRate < minPlayerPlaybackRate || *patch.PlaybackRate > maxPlayerPlaybackRate {
+			return DanmakuRenderConfig{}, fmt.Errorf(
+				"%w: playback_rate must be between %.2f and %.2f",
+				ErrInvalidDanmakuSettings,
+				minPlayerPlaybackRate,
+				maxPlayerPlaybackRate,
+			)
+		}
+		updates["player_playback_rate"] = *patch.PlaybackRate
+	}
 	if len(updates) == 0 {
 		return DanmakuRenderConfig{}, ErrNoDanmakuSettings
 	}

internal/service/danmaku_service_test.go

@@ -422,6 +422,7 @@ func TestDanmakuFetchUsesPerUserSourceAndCredentials(t *testing.T) {
 	user.DanmakuFontSize = 30
 	user.DanmakuArea = 0.7
 	user.PlayerVolume = 0.42
+	user.PlayerPlaybackRate = 1.25
 	require.NoError(t, svc.repo.User.Create(ctx, &user))
 	seedDanmakuMedia(t, svc, "per-user-media", "测试动画", "", 0)
 
@@ -430,6 +431,7 @@ func TestDanmakuFetchUsesPerUserSourceAndCredentials(t *testing.T) {
 	require.Contains(t, res.Raw, "弹幕A")
 	require.Equal(t, srv.URL(), res.Source)
 	require.Equal(t, 0.42, res.Volume)
+	require.Equal(t, 1.25, res.PlaybackRate)
 	require.Equal(t, "0.65", res.Opacity)
 	require.Equal(t, "30", res.FontSize)
 	require.Equal(t, srv.lastHeaders.Get("X-AppId"), "user-app-id")

web/src/api/danmaku.ts

@@ -71,6 +71,7 @@ export interface DanmakuConfig {
   font_size: string
   area: string
   volume: number
+  playback_rate: number
   /** Per-user preference: merge the same episode's multiple sources. */
   merge_sources: boolean
 }
@@ -87,6 +88,7 @@ export interface DanmakuSettingsPatch {
   area?: number
   merge_sources?: boolean
   volume?: number
+  playback_rate?: number
 }
 
 // danmakuAPI fetches danmaku comments for a media item. The backend resolves

web/src/components/Layout.tsx

@@ -87,7 +87,11 @@ export function Layout() {
             pathname={location.pathname}
           />
         )}
-        <LayoutWorkspace routeKey={location.pathname} showMobileBottomNav={showMobileBottomNav} />
+        <LayoutWorkspace
+          routeKey={location.pathname}
+          userKey={user?.id}
+          showMobileBottomNav={showMobileBottomNav}
+        />
         {showMobileBottomNav && (
           <MobileBottomNav onOpenMenu={() => sidebar.setIsMobileDrawerOpen(true)} />
         )}

web/src/components/LayoutSections.tsx

@@ -4,6 +4,7 @@ import clsx from 'clsx'
 import { LayoutSidebarContent, type LayoutSidebarContentProps } from './LayoutSidebarContent'
 import { isPlayerRoute } from './layoutNavigation'
 import { RouteErrorBoundary } from './RouteErrorBoundary'
+import { useScrollMemory } from '../hooks/useScrollMemory'
 import type { useLayoutSidebar } from './useLayoutSidebar'
 
 type LayoutSidebarState = ReturnType<typeof useLayoutSidebar>
@@ -30,6 +31,7 @@ type LayoutSidebarsProps = Omit<
 
 type LayoutWorkspaceProps = {
   routeKey: string
+  userKey?: string
   showMobileBottomNav?: boolean
 }
 
@@ -109,7 +111,13 @@ export function LayoutSidebars({
   )
 }
 
-export function LayoutWorkspace({ routeKey, showMobileBottomNav = false }: LayoutWorkspaceProps) {
+export function LayoutWorkspace({
+  routeKey,
+  userKey = 'anonymous',
+  showMobileBottomNav = false,
+}: LayoutWorkspaceProps) {
+  useScrollMemory(routeKey, userKey)
+
   const bottomPad = showMobileBottomNav
     ? 'pb-[calc(3.75rem+env(safe-area-inset-bottom,0px))] lg:pb-10'
     : ''

web/src/components/PlayerControls.tsx

@@ -18,11 +18,18 @@ import {
   Rewind,
   SkipBack,
   SkipForward,
+  Timer,
   Volume2,
   VolumeX,
 } from 'lucide-react'
 import type { SubtitleTrack } from '../api/subtitles'
 import type { PlaybackQuality } from '../types'
+import {
+  formatPlaybackRate,
+  normalizePlaybackRate,
+  PLAYBACK_RATE_OPTIONS,
+  stepPlaybackRate,
+} from '../utils/playbackRate'
 import type { SubtitleChineseMode } from '../utils/subtitleChinese'
 import {
   SUBTITLE_POSITION_OPTIONS,
@@ -47,18 +54,28 @@ const SEEK_STEP_SEC = 10
 const SEEK_REPEAT_MS = 160
 const SEEK_APPLY_MS = 220
 const SEEK_HINT_MS = 700
+const PLAYBACK_RATE_REPEAT_MS = 140
+const PLAYBACK_RATE_HINT_MS = 900
 
 type SeekHint = {
   dir: 'back' | 'forward'
   seconds: number
 }
 
-function isEditableTarget(target: EventTarget | null): boolean {
+function isPlayerSeekRange(target: EventTarget | null): boolean {
+  return target instanceof HTMLInputElement && target.dataset.playerSeekRange === 'true'
+}
+
+function shouldIgnorePlayerSeekShortcut(target: EventTarget | null): boolean {
   if (!(target instanceof HTMLElement)) return false
-  return Boolean(
-    target.closest('input, textarea, select, [contenteditable="true"]') ||
-      target.isContentEditable,
+  const control = target.closest<HTMLElement>(
+    'input, textarea, select, [contenteditable="true"]',
   )
+  if (control instanceof HTMLInputElement) {
+    // 进度条需要继续走播放器的 10 秒快捷键；其它输入控件保留原生键盘行为。
+    return !isPlayerSeekRange(control)
+  }
+  return Boolean(control || target.isContentEditable)
 }
 
 type PlayerControlsProps = {
@@ -67,6 +84,10 @@ type PlayerControlsProps = {
   volume?: number
   onVolumeChange?: (volume: number) => void
   onVolumeCommit?: (volume: number) => void
+  /** 用户级播放倍速，由播放页从数据库读取。 */
+  playbackRate?: number
+  onPlaybackRateChange?: (rate: number) => void
+  onPlaybackRateCommit?: (rate: number) => void
   uiVisible: boolean
   onUiVisibleChange: (visible: boolean) => void
   subs: SubtitleTrack[]
@@ -108,6 +129,9 @@ export function PlayerControls({
   volume: volumeProp = 1,
   onVolumeChange,
   onVolumeCommit,
+  playbackRate: playbackRateProp = 1,
+  onPlaybackRateChange,
+  onPlaybackRateCommit,
   uiVisible,
   onUiVisibleChange,
   subs,
@@ -159,11 +183,14 @@ export function PlayerControls({
   const subtitleMenuRef = useRef<HTMLDivElement | null>(null)
   const [qualityMenuOpen, setQualityMenuOpen] = useState(false)
   const qualityMenuRef = useRef<HTMLDivElement | null>(null)
+  const [speedMenuOpen, setSpeedMenuOpen] = useState(false)
+  const speedMenuRef = useRef<HTMLDivElement | null>(null)
   const hideTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
   const controlsHoveredRef = useRef(false)
   const isScrubbingRef = useRef(false)
   const subtitleMenuOpenRef = useRef(false)
   const qualityMenuOpenRef = useRef(false)
+  const speedMenuOpenRef = useRef(false)
   const danmakuOpenRef = useRef(false)
   const playlistOpenRef = useRef(false)
   const pendingSeekRef = useRef<number | null>(null)
@@ -173,7 +200,11 @@ export function PlayerControls({
   const seekApplyTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
   const seekHintTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
   const lastSeekAtRef = useRef(0)
+  const playbackRateRef = useRef(normalizePlaybackRate(playbackRateProp))
+  const playbackRateHintTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
+  const lastPlaybackRateAtRef = useRef(0)
   const [seekHint, setSeekHint] = useState<SeekHint | null>(null)
+  const [playbackRateHint, setPlaybackRateHint] = useState<number | null>(null)
   const [stageEl, setStageEl] = useState<HTMLElement | null>(null)
 
   useEffect(() => {
@@ -192,6 +223,10 @@ export function PlayerControls({
     qualityMenuOpenRef.current = qualityMenuOpen
   }, [qualityMenuOpen])
 
+  useEffect(() => {
+    speedMenuOpenRef.current = speedMenuOpen
+  }, [speedMenuOpen])
+
   useEffect(() => {
     danmakuOpenRef.current = danmakuOpen
   }, [danmakuOpen])
@@ -204,6 +239,10 @@ export function PlayerControls({
     durationRef.current = duration
   }, [duration])
 
+  useEffect(() => {
+    playbackRateRef.current = normalizePlaybackRate(playbackRateProp)
+  }, [playbackRateProp])
+
   useEffect(() => {
     setStageEl(container())
   }, [container])
@@ -219,9 +258,19 @@ export function PlayerControls({
     setMuted(next === 0)
   }, [video, volumeProp])
 
-  // 点击控制栏外部时关闭字幕/画质菜单
+  // 倍速由播放页按用户持久化；配置加载、切换剧集或切换播放源后同步到当前 video。
   useEffect(() => {
-    if (!subtitleMenuOpen && !qualityMenuOpen) return
+    const el = video()
+    if (!el) return
+    const next = normalizePlaybackRate(playbackRateProp)
+    if (Math.abs(el.playbackRate - next) > 0.001) {
+      el.playbackRate = next
+    }
+  }, [video, playbackRateProp])
+
+  // 点击控制栏外部时关闭字幕/画质/倍速菜单
+  useEffect(() => {
+    if (!subtitleMenuOpen && !qualityMenuOpen && !speedMenuOpen) return
     const onDocClick = (e: MouseEvent) => {
       if (subtitleMenuRef.current && !subtitleMenuRef.current.contains(e.target as Node)) {
         setSubtitleMenuOpen(false)
@@ -229,10 +278,13 @@ export function PlayerControls({
       if (qualityMenuRef.current && !qualityMenuRef.current.contains(e.target as Node)) {
         setQualityMenuOpen(false)
       }
+      if (speedMenuRef.current && !speedMenuRef.current.contains(e.target as Node)) {
+        setSpeedMenuOpen(false)
+      }
     }
     document.addEventListener('mousedown', onDocClick)
     return () => document.removeEventListener('mousedown', onDocClick)
-  }, [subtitleMenuOpen, qualityMenuOpen])
+  }, [subtitleMenuOpen, qualityMenuOpen, speedMenuOpen])
 
   // 播放时 3 秒无操作自动隐藏控制栏；暂停/悬停/拖动进度条/打开菜单时保持显示。
   // 监听挂在整个播放器舞台容器（data-player-stage）上，避免光标移到控制栏时因离开视频画面而误触发 mouseleave。
@@ -249,6 +301,7 @@ export function PlayerControls({
         !isScrubbingRef.current &&
         !subtitleMenuOpenRef.current &&
         !qualityMenuOpenRef.current &&
+        !speedMenuOpenRef.current &&
         !danmakuOpenRef.current &&
         !playlistOpenRef.current
       ) {
@@ -258,6 +311,7 @@ export function PlayerControls({
             !isScrubbingRef.current &&
             !subtitleMenuOpenRef.current &&
             !qualityMenuOpenRef.current &&
+            !speedMenuOpenRef.current &&
             !danmakuOpenRef.current &&
             !playlistOpenRef.current
           ) {
@@ -360,7 +414,7 @@ export function PlayerControls({
 
   // 当悬停或菜单状态改变时，更新控制栏计时器
   useEffect(() => {
-    if (controlsHovered || isScrubbing || subtitleMenuOpen || qualityMenuOpen || danmakuOpen || playlistOpen) {
+    if (controlsHovered || isScrubbing || subtitleMenuOpen || qualityMenuOpen || speedMenuOpen || danmakuOpen || playlistOpen) {
       onUiVisibleChange(true)
       if (hideTimerRef.current) clearTimeout(hideTimerRef.current)
     } else {
@@ -370,7 +424,7 @@ export function PlayerControls({
         hideTimerRef.current = setTimeout(() => onUiVisibleChange(false), 3000)
       }
     }
-  }, [controlsHovered, isScrubbing, subtitleMenuOpen, qualityMenuOpen, danmakuOpen, playlistOpen, onUiVisibleChange, video])
+  }, [controlsHovered, isScrubbing, subtitleMenuOpen, qualityMenuOpen, speedMenuOpen, danmakuOpen, playlistOpen, onUiVisibleChange, video])
 
   const togglePlay = () => {
     const el = video()
@@ -379,6 +433,30 @@ export function PlayerControls({
     else el.pause()
   }
 
+  const changePlaybackRate = useCallback((next: number) => {
+    const normalized = normalizePlaybackRate(next)
+    playbackRateRef.current = normalized
+    onPlaybackRateChange?.(normalized)
+    setPlaybackRateHint(normalized)
+    if (playbackRateHintTimerRef.current) {
+      clearTimeout(playbackRateHintTimerRef.current)
+    }
+    playbackRateHintTimerRef.current = setTimeout(() => {
+      setPlaybackRateHint(null)
+      playbackRateHintTimerRef.current = null
+    }, PLAYBACK_RATE_HINT_MS)
+  }, [onPlaybackRateChange])
+
+  const commitPlaybackRate = useCallback(() => {
+    onPlaybackRateCommit?.(playbackRateRef.current)
+  }, [onPlaybackRateCommit])
+
+  const selectPlaybackRate = useCallback((next: number) => {
+    const normalized = normalizePlaybackRate(next)
+    changePlaybackRate(normalized)
+    onPlaybackRateCommit?.(normalized)
+  }, [changePlaybackRate, onPlaybackRateCommit])
+
   const applyAbsoluteSeek = useCallback(
     (absolute: number) => {
       const el = video()
@@ -454,7 +532,7 @@ export function PlayerControls({
     }, 3000)
   }, [onUiVisibleChange, video])
 
-  const queueRelativeSeek = useCallback((delta: number) => {
+  const queueRelativeSeek = useCallback((delta: number, immediate: boolean) => {
     const el = video()
     if (!el) return
     if (!seekBurstRef.current) {
@@ -489,6 +567,16 @@ export function PlayerControls({
 
     if (seekHintTimerRef.current) clearTimeout(seekHintTimerRef.current)
     seekHintTimerRef.current = setTimeout(() => setSeekHint(null), SEEK_HINT_MS)
+    if (immediate) {
+      if (seekApplyTimerRef.current) {
+        clearTimeout(seekApplyTimerRef.current)
+        seekApplyTimerRef.current = null
+      }
+      const burst = seekBurstRef.current
+      seekBurstRef.current = null
+      applySeekRef.current(burst.base + burst.delta)
+      return
+    }
     if (seekApplyTimerRef.current) clearTimeout(seekApplyTimerRef.current)
     seekApplyTimerRef.current = setTimeout(() => {
       const burst = seekBurstRef.current
@@ -502,23 +590,47 @@ export function PlayerControls({
   useEffect(() => {
     const onKey = (e: KeyboardEvent) => {
       if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) return
-      if (isEditableTarget(e.target)) return
+      if (shouldIgnorePlayerSeekShortcut(e.target)) return
+      if (e.key === 'ArrowUp' || e.key === 'ArrowDown') {
+        e.preventDefault()
+        const now = Date.now()
+        if (e.repeat && now - lastPlaybackRateAtRef.current < PLAYBACK_RATE_REPEAT_MS) return
+        lastPlaybackRateAtRef.current = now
+        changePlaybackRate(
+          stepPlaybackRate(playbackRateRef.current, e.key === 'ArrowUp' ? 1 : -1),
+        )
+        return
+      }
       if (e.key !== 'ArrowLeft' && e.key !== 'ArrowRight') return
       e.preventDefault()
       const now = Date.now()
       if (e.repeat && now - lastSeekAtRef.current < SEEK_REPEAT_MS) return
+      const immediate = !e.repeat && now - lastSeekAtRef.current >= SEEK_APPLY_MS
       lastSeekAtRef.current = now
       e.preventDefault()
-      queueRelativeSeek(e.key === 'ArrowLeft' ? -SEEK_STEP_SEC : SEEK_STEP_SEC)
+      queueRelativeSeek(e.key === 'ArrowLeft' ? -SEEK_STEP_SEC : SEEK_STEP_SEC, immediate)
     }
-    window.addEventListener('keydown', onKey)
-    return () => window.removeEventListener('keydown', onKey)
-  }, [queueRelativeSeek])
+    window.addEventListener('keydown', onKey, true)
+    return () => window.removeEventListener('keydown', onKey, true)
+  }, [changePlaybackRate, queueRelativeSeek])
+
+  useEffect(() => {
+    const onKeyUp = (e: KeyboardEvent) => {
+      if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) return
+      if (e.key !== 'ArrowUp' && e.key !== 'ArrowDown') return
+      if (shouldIgnorePlayerSeekShortcut(e.target)) return
+      e.preventDefault()
+      commitPlaybackRate()
+    }
+    window.addEventListener('keyup', onKeyUp, true)
+    return () => window.removeEventListener('keyup', onKeyUp, true)
+  }, [commitPlaybackRate])
 
   useEffect(() => {
     return () => {
       if (seekApplyTimerRef.current) clearTimeout(seekApplyTimerRef.current)
       if (seekHintTimerRef.current) clearTimeout(seekHintTimerRef.current)
+      if (playbackRateHintTimerRef.current) clearTimeout(playbackRateHintTimerRef.current)
     }
   }, [])
 
@@ -612,9 +724,24 @@ export function PlayerControls({
       )
     : null
 
+  const playbackRateOverlay = playbackRateHint && stageEl
+    ? createPortal(
+        <div className="pointer-events-none absolute inset-0 z-30 flex items-center justify-center">
+          <div className="flex items-center gap-2 rounded-full bg-black/65 px-5 py-3 text-white shadow-lg backdrop-blur-sm">
+            <Timer size={22} />
+            <span className="text-sm font-semibold tabular-nums">
+              {formatPlaybackRate(playbackRateHint)} 倍速
+            </span>
+          </div>
+        </div>,
+        stageEl,
+      )
+    : null
+
   return (
     <>
     {seekOverlay}
+    {playbackRateOverlay}
     <div
       className={`pointer-events-auto absolute inset-x-0 bottom-0 z-20 bg-gradient-to-t from-black/80 via-black/40 to-transparent px-3 pb-3 pt-14 transition-opacity duration-300 ${
         uiVisible ? 'opacity-100' : 'pointer-events-none opacity-0'
@@ -665,6 +792,7 @@ export function PlayerControls({
         <div className="order-2 flex min-w-0 basis-full items-center gap-2 sm:order-none sm:basis-auto sm:flex-1">
           <input
             type="range"
+            data-player-seek-range="true"
             min={0}
             max={duration || 0}
             step={0.1}
@@ -697,6 +825,7 @@ export function PlayerControls({
             <button
               onClick={() => {
                 setSubtitleMenuOpen(false)
+                setSpeedMenuOpen(false)
                 setQualityMenuOpen((v) => !v)
               }}
               className="flex items-center gap-1 rounded-full p-1.5 transition hover:bg-white/15"
@@ -754,11 +883,55 @@ export function PlayerControls({
           </div>
         )}
 
+        <div className="relative" ref={speedMenuRef}>
+          <button
+            onClick={() => {
+              setSubtitleMenuOpen(false)
+              setQualityMenuOpen(false)
+              setSpeedMenuOpen((v) => !v)
+            }}
+            className="flex items-center gap-1 rounded-full p-1.5 transition hover:bg-white/15"
+            title="播放速度（↑/↓ 调节）"
+          >
+            <Timer size={18} className={speedMenuOpen ? 'text-rose-400' : 'text-white/80'} />
+            <span className="text-[10px] font-semibold tabular-nums text-white/80">
+              {formatPlaybackRate(playbackRateProp)}
+            </span>
+          </button>
+          {speedMenuOpen && (
+            <div className="absolute bottom-11 right-0 z-30 min-w-36 overflow-hidden rounded-xl border border-white/15 bg-black/85 p-1 shadow-2xl backdrop-blur">
+              <p className="px-3 pb-1 pt-2 text-[10px] uppercase tracking-wide text-white/40">
+                播放速度
+              </p>
+              {PLAYBACK_RATE_OPTIONS.map((rate) => {
+                const current = normalizePlaybackRate(playbackRateProp) === rate
+                return (
+                  <button
+                    key={rate}
+                    type="button"
+                    onClick={() => {
+                      selectPlaybackRate(rate)
+                      setSpeedMenuOpen(false)
+                    }}
+                    className={`flex w-full items-center gap-2 rounded-lg px-3 py-1.5 text-left text-xs transition ${
+                      current ? 'text-rose-400 hover:bg-white/10' : 'text-white/85 hover:bg-white/10'
+                    }`}
+                  >
+                    <span className="tabular-nums">{formatPlaybackRate(rate)}</span>
+                    {current && <Check size={13} className="ml-auto text-rose-400" />}
+                  </button>
+                )
+              })}
+            </div>
+          )}
+        </div>
+
         {subs.length > 0 && (
           <div className="relative" ref={subtitleMenuRef}>
             <button
               onClick={() => {
                 setQualityMenuOpen(false)
+                setSpeedMenuOpen(false)
                 setSubtitleMenuOpen((v) => !v)
               }}
               className="rounded-full p-1.5 transition hover:bg-white/15"

web/src/hooks/useScrollMemory.test.ts

@@ -0,0 +1,14 @@
+import { shouldRememberScroll } from './useScrollMemory.ts'
+
+function check(name: string, condition: boolean) {
+  if (!condition) throw new Error(`useScrollMemory: ${name}`)
+}
+
+check('home remembers scroll', shouldRememberScroll('/'))
+check('library list remembers scroll', shouldRememberScroll('/libraries'))
+check('library detail remembers scroll', shouldRememberScroll('/library/lib-1'))
+check('media detail remembers scroll', shouldRememberScroll('/media/media-1'))
+check('settings does not remember scroll', !shouldRememberScroll('/settings'))
+check('player does not remember scroll', !shouldRememberScroll('/play/media-1'))
+
+console.log('useScrollMemory.test.ts ok')

web/src/hooks/useScrollMemory.ts

@@ -0,0 +1,177 @@
+import { useLayoutEffect } from 'react'
+
+const SCROLL_STORAGE_PREFIX = 'mebox.scroll.'
+const scrollPositions = new Map<string, number>()
+
+function readScrollPosition(key: string): number {
+  const cached = scrollPositions.get(key)
+  if (cached !== undefined) return cached
+  if (typeof window === 'undefined') return 0
+  try {
+    const value = Number(window.sessionStorage.getItem(SCROLL_STORAGE_PREFIX + key))
+    if (Number.isFinite(value) && value >= 0) {
+      scrollPositions.set(key, value)
+      return value
+    }
+  } catch {
+    // sessionStorage 不可用时仍可使用内存缓存。
+  }
+  return 0
+}
+
+function writeScrollPosition(key: string, value: number): void {
+  const next = Math.max(0, Math.round(value))
+  scrollPositions.set(key, next)
+  if (typeof window === 'undefined') return
+  try {
+    window.sessionStorage.setItem(SCROLL_STORAGE_PREFIX + key, String(next))
+  } catch {
+    // 私密模式等场景忽略存储失败，不影响页面滚动。
+  }
+}
+
+export function shouldRememberScroll(pathname: string): boolean {
+  return (
+    pathname === '/' ||
+    pathname === '/libraries' ||
+    pathname.startsWith('/library/') ||
+    pathname.startsWith('/media/')
+  )
+}
+
+/**
+ * 记住列表页的滚动位置。页面内容会异步长高，因此恢复期间会监听内容高度，
+ * 直到目标位置可达；期间用户主动滚动会立即接管，避免和恢复逻辑抢滚动条。
+ */
+export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
+  useLayoutEffect(() => {
+    const el = document.getElementById('app-main-scroll')
+    if (!el) return
+
+    if (!shouldRememberScroll(pathname)) {
+      el.scrollTop = 0
+      return
+    }
+
+    const key = `${userKey}:${pathname}`
+    const saved = readScrollPosition(key)
+    let restoring = saved > 0
+    let observer: ResizeObserver | null = null
+    let restoreTimer: number | null = null
+    let restoreFrame = 0
+    let restorePumpUntil = 0
+    let lastSaved = saved
+
+    const stopRestore = () => {
+      if (restoreFrame) {
+        window.cancelAnimationFrame(restoreFrame)
+        restoreFrame = 0
+      }
+      if (restoreTimer != null) {
+        window.clearTimeout(restoreTimer)
+        restoreTimer = null
+      }
+      observer?.disconnect()
+      observer = null
+    }
+
+    const finishRestore = () => {
+      if (!restoring) return
+      restoring = false
+      stopRestore()
+      lastSaved = Math.round(el.scrollTop)
+      writeScrollPosition(key, lastSaved)
+    }
+
+    const tryRestore = () => {
+      if (!restoring) return
+      const max = Math.max(0, el.scrollHeight - el.clientHeight)
+      const target = Math.min(saved, max)
+      if (target > 0 && Math.abs(el.scrollTop - target) > 1) {
+        el.scrollTop = target
+      }
+      if (target >= saved - 1) {
+        finishRestore()
+      }
+    }
+
+    const pumpRestore = () => {
+      if (!restoring) return
+      tryRestore()
+      if (restoring && performance.now() < restorePumpUntil) {
+        restoreFrame = window.requestAnimationFrame(pumpRestore)
+      } else {
+        restoreFrame = 0
+      }
+    }
+
+    const saveNow = () => {
+      if (restoring) return
+      const current = Math.round(el.scrollTop)
+      if (current === lastSaved) return
+      lastSaved = current
+      writeScrollPosition(key, current)
+    }
+
+    const cancelRestore = () => {
+      if (!restoring) return
+      restoring = false
+      stopRestore()
+      lastSaved = Math.round(el.scrollTop)
+      writeScrollPosition(key, lastSaved)
+    }
+
+    if (saved <= 0) {
+      el.scrollTop = 0
+    } else {
+      tryRestore()
+      if (restoring) {
+        const content = el.firstElementChild
+        if (typeof ResizeObserver !== 'undefined' && content instanceof HTMLElement) {
+          observer = new ResizeObserver(() => tryRestore())
+          observer.observe(content)
+        }
+        restorePumpUntil = performance.now() + 1000
+        restoreFrame = window.requestAnimationFrame(pumpRestore)
+        restoreTimer = window.setTimeout(finishRestore, 10000)
+      }
+    }
+
+    const onPointerDown = (event: PointerEvent) => {
+      if (event.target === el) {
+        cancelRestore()
+      }
+      saveNow()
+    }
+
+    const onKeyDown = (event: KeyboardEvent) => {
+      if (
+        event.key === 'PageDown' ||
+        event.key === 'PageUp' ||
+        event.key === 'Home' ||
+        event.key === 'End' ||
+        event.key === 'ArrowDown' ||
+        event.key === 'ArrowUp' ||
+        event.key === ' '
+      ) {
+        cancelRestore()
+      }
+      saveNow()
+    }
+
+    el.addEventListener('scroll', saveNow, { passive: true })
+    el.addEventListener('pointerdown', onPointerDown, true)
+    window.addEventListener('wheel', cancelRestore, { passive: true, capture: true })
+    window.addEventListener('touchstart', cancelRestore, { passive: true, capture: true })
+    window.addEventListener('keydown', onKeyDown, true)
+
+    return () => {
+      el.removeEventListener('scroll', saveNow)
+      el.removeEventListener('pointerdown', onPointerDown, true)
+      window.removeEventListener('wheel', cancelRestore, true)
+      window.removeEventListener('touchstart', cancelRestore, true)
+      window.removeEventListener('keydown', onKeyDown, true)
+      stopRestore()
+    }
+  }, [pathname, userKey])
+}

web/src/pages/PlayerPage.tsx

@@ -19,6 +19,7 @@ import { profileAPI } from '../api/profile'
 import { useAuthStore } from '../stores/auth'
 import type { Media, PlaybackInfo, PlaybackQuality } from '../types'
 import { getSeriesKey, seriesTitleFromPath } from '../utils/groupSeries'
+import { normalizePlaybackRate } from '../utils/playbackRate'
 import { isRemoteEmbyID } from '../utils/remoteEmby'
 import {
   normalizeSubtitleChineseMode,
@@ -109,8 +110,13 @@ export function PlayerPage() {
   const [playerVolume, setPlayerVolume] = useState(() =>
     normalizePlayerVolume(authUser?.player_volume),
   )
+  const [playerPlaybackRate, setPlayerPlaybackRate] = useState(() =>
+    normalizePlaybackRate(authUser?.player_playback_rate),
+  )
   const persistedSubtitleChineseModeRef = useRef(subtitleChineseMode)
   const playerVolumeTouchedRef = useRef(false)
+  const playerPlaybackRateTouchedRef = useRef(false)
+  const playerPlaybackRateSaveSeqRef = useRef(0)
   const subtitlePreferenceTouchedRef = useRef(false)
   const subtitlePreferenceSaveQueueRef = useRef<Promise<void>>(Promise.resolve())
   const [hlsUnavailable, setHlsUnavailable] = useState(false)
@@ -245,6 +251,10 @@ export function PlayerPage() {
         if (!playerVolumeTouchedRef.current) {
           setPlayerVolume(volume)
         }
+        const playbackRate = normalizePlaybackRate(cfg.playback_rate)
+        if (!playerPlaybackRateTouchedRef.current) {
+          setPlayerPlaybackRate(playbackRate)
+        }
         setDanmakuEnabled(cfg.enabled)
         setDanmakuOpacity(Number(cfg.opacity) || 1)
         setDanmakuFontSize(Number(cfg.font_size) || 24)
@@ -255,6 +265,10 @@ export function PlayerPage() {
           const current = useAuthStore.getState().user
           if (current) setAuthUser({ ...current, player_volume: volume })
         }
+        if (!playerPlaybackRateTouchedRef.current) {
+          const current = useAuthStore.getState().user
+          if (current) setAuthUser({ ...current, player_playback_rate: playbackRate })
+        }
       })
       .catch(() => {
         // 配置读取失败时保持本地默认值，不影响播放。
@@ -289,6 +303,34 @@ export function PlayerPage() {
     [setAuthUser],
   )
 
+  const changePlayerPlaybackRate = useCallback((next: number) => {
+    playerPlaybackRateTouchedRef.current = true
+    setPlayerPlaybackRate(normalizePlaybackRate(next))
+  }, [])
+
+  const commitPlayerPlaybackRate = useCallback(
+    (next: number) => {
+      playerPlaybackRateTouchedRef.current = true
+      const playbackRate = normalizePlaybackRate(next)
+      setPlayerPlaybackRate(playbackRate)
+      const saveSeq = ++playerPlaybackRateSaveSeqRef.current
+      void danmakuAPI
+        .updateSettings({ playback_rate: playbackRate })
+        .then((cfg) => {
+          if (saveSeq !== playerPlaybackRateSaveSeqRef.current) return
+          const saved = normalizePlaybackRate(cfg.playback_rate)
+          setPlayerPlaybackRate(saved)
+          const current = useAuthStore.getState().user
+          if (current) setAuthUser({ ...current, player_playback_rate: saved })
+        })
+        .catch(() => {
+          if (saveSeq !== playerPlaybackRateSaveSeqRef.current) return
+          toast.error('倍速保存失败，请重试')
+        })
+    },
+    [setAuthUser],
+  )
+
   const saveDanmakuAdvanced = useCallback(
     async (values: { source: string; appId: string; appKey: string; clearAppKey: boolean }) => {
       const patch: DanmakuSettingsPatch = {
@@ -1424,6 +1466,9 @@ export function PlayerPage() {
         playerVolume={playerVolume}
         onPlayerVolumeChange={changePlayerVolume}
         onPlayerVolumeCommit={commitPlayerVolume}
+        playerPlaybackRate={playerPlaybackRate}
+        onPlayerPlaybackRateChange={changePlayerPlaybackRate}
+        onPlayerPlaybackRateCommit={commitPlayerPlaybackRate}
         danmakuEnabled={danmakuEnabled}
         danmakuOpacity={danmakuOpacity}
         danmakuFontSize={danmakuFontSize}

web/src/pages/PlayerVideoStage.tsx

@@ -151,6 +151,9 @@ type PlayerVideoStageProps = {
   playerVolume: number
   onPlayerVolumeChange: (volume: number) => void
   onPlayerVolumeCommit: (volume: number) => void
+  playerPlaybackRate: number
+  onPlayerPlaybackRateChange: (rate: number) => void
+  onPlayerPlaybackRateCommit: (rate: number) => void
   danmakuEnabled: boolean
   danmakuOpacity: number
   danmakuFontSize: number
@@ -205,6 +208,9 @@ export function PlayerVideoStage({
   playerVolume,
   onPlayerVolumeChange,
   onPlayerVolumeCommit,
+  playerPlaybackRate,
+  onPlayerPlaybackRateChange,
+  onPlayerPlaybackRateCommit,
   danmakuEnabled,
   danmakuOpacity,
   danmakuFontSize,
@@ -653,6 +659,9 @@ export function PlayerVideoStage({
             volume={playerVolume}
             onVolumeChange={onPlayerVolumeChange}
             onVolumeCommit={onPlayerVolumeCommit}
+            playbackRate={playerPlaybackRate}
+            onPlaybackRateChange={onPlayerPlaybackRateChange}
+            onPlaybackRateCommit={onPlayerPlaybackRateCommit}
             uiVisible={controlsVisible}
             onUiVisibleChange={setControlsVisible}
             subs={subs}

web/src/types/auth.ts

@@ -10,6 +10,8 @@ export interface User {
   subtitle_chinese_mode?: 'original' | 'simplified' | 'traditional'
   /** 本地缓存的播放器音量，服务端配置接口会刷新。 */
   player_volume?: number
+  /** 本地缓存的播放倍速，服务端配置接口会刷新。 */
+  player_playback_rate?: number
   force_password_reset: boolean
   is_active: boolean
   allowed_library_ids?: string[]

web/src/utils/playbackRate.test.ts

@@ -0,0 +1,22 @@
+import {
+  formatPlaybackRate,
+  normalizePlaybackRate,
+  stepPlaybackRate,
+} from './playbackRate.ts'
+
+function check(name: string, condition: boolean) {
+  if (!condition) throw new Error(`playbackRate: ${name}`)
+}
+
+check('invalid value falls back to 1x', normalizePlaybackRate(undefined) === 1)
+check('value snaps to nearest selectable rate', normalizePlaybackRate(1.2) === 1.25)
+check('value below range clamps to the minimum', normalizePlaybackRate(0.1) === 0.5)
+check('value above range clamps to the maximum', normalizePlaybackRate(9) === 3)
+check('up steps to the next rate', stepPlaybackRate(1, 1) === 1.25)
+check('down steps to the previous rate', stepPlaybackRate(1, -1) === 0.75)
+check('up stops at the maximum', stepPlaybackRate(3, 1) === 3)
+check('down stops at the minimum', stepPlaybackRate(0.5, -1) === 0.5)
+check('integer formatting', formatPlaybackRate(1) === '1x')
+check('decimal formatting', formatPlaybackRate(1.25) === '1.25x')
+
+console.log('playbackRate.test.ts ok')

web/src/utils/playbackRate.ts

@@ -0,0 +1,31 @@
+export const PLAYBACK_RATE_OPTIONS = [0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.5, 3] as const
+
+export const MIN_PLAYBACK_RATE = PLAYBACK_RATE_OPTIONS[0]
+export const MAX_PLAYBACK_RATE = PLAYBACK_RATE_OPTIONS[PLAYBACK_RATE_OPTIONS.length - 1]
+
+export function normalizePlaybackRate(value: unknown): number {
+  const parsed = Number(value)
+  if (!Number.isFinite(parsed)) return 1
+  let closest: number = PLAYBACK_RATE_OPTIONS[0]
+  let closestDistance = Number.POSITIVE_INFINITY
+  for (const option of PLAYBACK_RATE_OPTIONS) {
+    const distance = Math.abs(option - parsed)
+    if (distance < closestDistance) {
+      closest = option
+      closestDistance = distance
+    }
+  }
+  return closest
+}
+
+export function stepPlaybackRate(current: unknown, direction: 1 | -1): number {
+  const normalized = normalizePlaybackRate(current)
+  const index = PLAYBACK_RATE_OPTIONS.indexOf(normalized as (typeof PLAYBACK_RATE_OPTIONS)[number])
+  const next = Math.min(PLAYBACK_RATE_OPTIONS.length - 1, Math.max(0, index + direction))
+  return PLAYBACK_RATE_OPTIONS[next]
+}
+
+export function formatPlaybackRate(rate: unknown): string {
+  const normalized = normalizePlaybackRate(rate)
+  return `${Number.isInteger(normalized) ? normalized.toFixed(0) : String(normalized)}x`
+}