直播后台：新增按 IP 发言管控与在线会话视图。

支持全体禁言、单 IP 禁言/解禁与同 IP 本地限频，同时在开播页展示在线会话明细并补充实时优先码率策略，兼顾实时性与并发承载。

Made-with: Cursor

admin/src/utils/liveWebRTC.js

@@ -37,6 +37,20 @@ const QUALITY_MEDIA = {
   }
 }
 
+// 码率上限（kbps）: 在实时性与并发之间取平衡
+const QUALITY_VIDEO_MAX_KBPS = {
+  source: 1800,
+  high: 1400,
+  mid: 900,
+  low: 550
+}
+
+const BITRATE_PROFILE_MULTIPLIER = {
+  save: 0.78,
+  balanced: 1,
+  clarity: 1.2
+}
+
 function effectivePublishQualityKey() {
   try {
     const v = localStorage.getItem(LIVE_CAPTURE_QUALITY_STORAGE_KEY)
@@ -45,6 +59,27 @@ function effectivePublishQualityKey() {
   return 'source'
 }
 
+function targetVideoMaxBitrateBps(publishKey, bitrateProfile = 'balanced') {
+  const kbps = QUALITY_VIDEO_MAX_KBPS[publishKey] || QUALITY_VIDEO_MAX_KBPS.source
+  const m = BITRATE_PROFILE_MULTIPLIER[bitrateProfile] || BITRATE_PROFILE_MULTIPLIER.balanced
+  return Math.max(220, Math.round(kbps * m)) * 1000
+}
+
+async function applyVideoSenderPolicy(sender, publishKey, bitrateProfile) {
+  if (!sender) return
+  try {
+    const p = sender.getParameters ? sender.getParameters() : null
+    if (!p) return
+    if (!p.encodings || !p.encodings.length) p.encodings = [{}]
+    p.degradationPreference = 'maintain-framerate'
+    p.encodings[0].maxBitrate = targetVideoMaxBitrateBps(publishKey, bitrateProfile)
+    // 保留一定冗余，弱网抖动时更稳，避免一路拉满
+    p.encodings[0].maxFramerate =
+      publishKey === 'low' ? 20 : publishKey === 'mid' ? 24 : 30
+    await sender.setParameters(p)
+  } catch (_) {}
+}
+
 function liveWsURLPublish(token) {
   const q = effectivePublishQualityKey()
   const path = `/api/web/live/ws?role=publish&token=${encodeURIComponent(token)}&quality=${encodeURIComponent(q)}`
@@ -132,6 +167,7 @@ export function startPublishing(opts = {}) {
     token = '',
     captureMode: initialMode = 'camera',
     videoDeviceId: initialDeviceId = '',
+    bitrateProfile = 'balanced',
     onStatus = () => {},
     onLocalStream = () => {},
     onActiveModeChange = () => {},
@@ -245,6 +281,9 @@ export function startPublishing(opts = {}) {
         throw e
       }
       const previewVid = new MediaStream([sTr])
+      try {
+        sTr.contentHint = 'detail'
+      } catch (_) {}
       onLocalStream({ layout: 'screen_only', main: previewVid })
       return new MediaStream([sTr, ...micStream.getAudioTracks()])
     }
@@ -309,6 +348,9 @@ export function startPublishing(opts = {}) {
         cam.getTracks().forEach((t) => t.stop())
         throw new Error('画布采集失败')
       }
+      try {
+        outV.contentHint = 'detail'
+      } catch (_) {}
       const mic = cam.getAudioTracks()
       const publish = new MediaStream([outV, ...mic])
       onLocalStream({
@@ -319,6 +361,10 @@ export function startPublishing(opts = {}) {
       return publish
     }
     const s = await navigator.mediaDevices.getUserMedia(buildCameraConstraints(publishKey, deviceIdState))
+    try {
+      const camV = s.getVideoTracks()[0]
+      if (camV) camV.contentHint = 'motion'
+    } catch (_) {}
     onLocalStream({ layout: 'camera', main: s })
     return s
   }
@@ -359,6 +405,11 @@ export function startPublishing(opts = {}) {
     stream.getTracks().forEach((t) => {
       if (t.readyState === 'live') pc.addTrack(t, stream)
     })
+    await applyVideoSenderPolicy(
+      pc.getSenders().find((s) => s.track?.kind === 'video'),
+      publishKey,
+      bitrateProfile
+    )
     const offer = await pc.createOffer()
     await pc.setLocalDescription(offer)
     send({ type: 'offer', sdp: offer.sdp })
@@ -410,6 +461,11 @@ export function startPublishing(opts = {}) {
       } else if (aT) {
         pc.addTrack(aT, stream)
       }
+      await applyVideoSenderPolicy(
+        pc.getSenders().find((s) => s.track?.kind === 'video'),
+        publishKey,
+        bitrateProfile
+      )
       const offer = await pc.createOffer({ iceRestart: false })
       await pc.setLocalDescription(offer)
       send({ type: 'offer', sdp: offer.sdp })