【m】测试，便于回退

WebApp/client/public/onebyone/index.html

@@ -149,7 +149,15 @@
         <div class="flex-1 relative bg-black/40 overflow-hidden" id="videoArea">
 
             <!--
-            子区域: 远端视频 (Remote Video)
+            子区域: 多Participant视频网格（Host端显示）
+            动态生成，每个participant一个视频格子
+            -->
+            <div id="participantGrid" class="hidden absolute inset-0 grid gap-3 p-3 auto-rows-fr" style="grid-template-columns: 1fr;">
+                <!-- 动态生成的 participant 视频格子将插入这里 -->
+            </div>
+
+            <!--
+            子区域: 远端视频 (Remote Video) - 单路（Participant端显示Host画面）
             数据源: RemoteUser
             -->
             <div class="absolute inset-0 video-fade-in">

WebApp/client/public/onebyone/renderer.js

@@ -16,6 +16,8 @@ class UIRenderer {
             // 头部和底部
             header: document.querySelector('header'),
             footer: document.querySelector('footer'),
+            // 多Participant视频网格
+            participantGrid: document.getElementById('participantGrid'),
             // 头部内容
             headerTitle: document.getElementById('headerTitle'),
             callDuration: document.getElementById('callDuration'),
@@ -144,10 +146,12 @@ class UIRenderer {
                 // 本地流获取成功 - 更新本地视频显示
                 this.renderLocalStream(state.localStream); // 渲染本地流
                 this.renderLocalVideo(state.session.localUser, state.localStream); // 渲染本地视频
+                // 如果host端有participant tile，同步更新它们的视频源
+                this.updateParticipantGridStreams(state.localStream);
                 break;
             case 'REMOTE_STREAM_OBTAINED':
                 // 远程流获取成功 - 更新远程视频显示
-                this.renderRemoteStream(state.remoteStream); // 渲染远程流
+                this.renderRemoteStream(changes.stream, changes.connectionId, changes.isHost); // 渲染远程流
                 // 当获取到远程流时，隐藏连接中提示
                 if (this.elements.connectingOverlay) {
                     this.elements.connectingOverlay.classList.add('hidden');
@@ -387,7 +391,127 @@ class UIRenderer {
     }
 
     // 渲染远程视频流
-    renderRemoteStream(stream) {
+    renderRemoteStream(stream, connectionId, isHost) {
+        if (isHost && connectionId) {
+            // Host端: 渲染到 participant 视频网格
+            this.renderParticipantStream(stream, connectionId);
+        } else {
+            // Participant端: 渲染到单一远端视频（Host的画面）
+            this.renderSingleRemoteStream(stream);
+        }
+    }
+
+    // 渲染Host端的多Participant视频网格
+    // 所有participant tile显示host的本地视频流（host监控自己广播的画面）
+    renderParticipantStream(stream, connectionId) {
+        const grid = this.elements.participantGrid;
+        if (!grid) return;
+
+        // 显示网格，隐藏单路远端视频
+        grid.classList.remove('hidden');
+
+        // 查找或创建该 connectionId 的视频格子
+        let tile = grid.querySelector(`[data-participant-id="${connectionId}"]`);
+        if (!tile) {
+            // 创建新的视频格子
+            tile = document.createElement('div');
+            tile.className = 'relative bg-black/60 rounded-xl overflow-hidden flex items-center justify-center';
+            tile.dataset.participantId = connectionId;
+
+            const video = document.createElement('video');
+            video.className = 'w-full h-full object-contain';
+            video.autoplay = true;
+            video.playsinline = true;
+            video.muted = true; // 静音，因为显示的是host自己的画面，不需要播放自己的声音
+            video.id = `participantVideo_${connectionId}`;
+            tile.appendChild(video);
+
+            // 添加隐藏的audio元素播放远端音频（participant的声音）
+            const audio = document.createElement('audio');
+            audio.autoplay = true;
+            audio.id = `participantAudio_${connectionId}`;
+            audio.style.display = 'none';
+            tile.appendChild(audio);
+
+            // 添加参与者名称标签
+            const label = document.createElement('div');
+            label.className = 'absolute bottom-3 left-3 glass px-3 py-1 rounded-full text-xs flex items-center gap-2';
+            label.innerHTML = `<i class="fas fa-user text-indigo-400"></i><span>Participant ${connectionId.slice(-4)}</span>`;
+            tile.appendChild(label);
+
+            // 添加"直播中"标识
+            const liveTag = document.createElement('div');
+            liveTag.className = 'absolute top-3 right-3 bg-red-500/80 px-2 py-0.5 rounded-full text-xs flex items-center gap-1';
+            liveTag.innerHTML = `<span class="w-1.5 h-1.5 bg-white rounded-full animate-pulse"></span><span>直播</span>`;
+            tile.appendChild(liveTag);
+
+            grid.appendChild(tile);
+            console.log(`Created participant video tile for ${connectionId}`);
+        }
+
+        if (tile) {
+            // 视频元素显示host的本地流（监控自己广播的画面）
+            const video = tile.querySelector('video');
+            if (video) {
+                const localStream = this.stateManager.getState().localStream;
+                if (localStream) {
+                    video.srcObject = localStream;
+                    console.log(`Set host local stream for participant tile ${connectionId}`);
+                } else {
+                    console.warn('Host local stream not available for participant tile');
+                }
+            }
+
+            // 隐藏audio元素播放远端流（participant的音频）
+            const audio = tile.querySelector('audio');
+            if (audio && stream) {
+                audio.srcObject = stream;
+                console.log(`Set remote audio for participant tile ${connectionId}`);
+            }
+
+            // 隐藏单路远端视频和占位符
+            const remoteVideoDiv = this.elements.remoteVideo?.closest('.absolute.inset-0.video-fade-in');
+            if (remoteVideoDiv) {
+                remoteVideoDiv.classList.add('hidden');
+            }
+        }
+
+        // 根据参与者数量调整网格列数
+        const tileCount = grid.querySelectorAll('[data-participant-id]').length;
+        if (tileCount <= 1) {
+            grid.style.gridTemplateColumns = '1fr';
+        } else if (tileCount <= 4) {
+            grid.style.gridTemplateColumns = 'repeat(2, 1fr)';
+        } else {
+            grid.style.gridTemplateColumns = 'repeat(3, 1fr)';
+        }
+
+        // 隐藏连接中提示
+        if (this.elements.connectingOverlay) {
+            this.elements.connectingOverlay.classList.add('hidden');
+        }
+
+        // 隐藏远端视频占位符
+        if (this.elements.remoteVideoPlaceholder) {
+            this.elements.remoteVideoPlaceholder.classList.add('hidden');
+        }
+    }
+
+    // 更新participant网格中所有tile的视频源（host本地流变化时调用）
+    updateParticipantGridStreams(localStream) {
+        const grid = this.elements.participantGrid;
+        if (!grid || grid.classList.contains('hidden')) return;
+
+        grid.querySelectorAll('[data-participant-id]').forEach(tile => {
+            const video = tile.querySelector('video');
+            if (video && localStream) {
+                video.srcObject = localStream;
+            }
+        });
+    }
+
+    // 渲染Participant端的单一远端视频（Host画面）
+    renderSingleRemoteStream(stream) {
         if (this.elements.remoteVideo && stream) {
             console.log('Rendering remote stream:', stream);
 
@@ -892,6 +1016,20 @@ class UIRenderer {
     // 渲染通话结束
     renderCallEnded() {
         console.log('Call ended');
+
+        // 清理participant网格
+        const grid = this.elements.participantGrid;
+        if (grid) {
+            grid.querySelectorAll('[data-participant-id]').forEach(tile => {
+                const video = tile.querySelector('video');
+                if (video) video.srcObject = null;
+                const audio = tile.querySelector('audio');
+                if (audio) audio.srcObject = null;
+                tile.remove();
+            });
+            grid.classList.add('hidden');
+        }
+
         // 跳转到结束通话界面
         window.location.href = './endcall/endcall.html';
     }
@@ -899,14 +1037,55 @@ class UIRenderer {
     // 渲染participant离开（host端，房间仍然存在）
     renderParticipantLeft(connectionId) {
         console.log(`Participant left: ${connectionId}, updating UI`);
+
+        // 移除该 participant 的视频格子
+        const grid = this.elements.participantGrid;
+        if (grid) {
+            const tile = grid.querySelector(`[data-participant-id="${connectionId}"]`);
+            if (tile) {
+                // 清理video元素
+                const video = tile.querySelector('video');
+                if (video) {
+                    video.srcObject = null;
+                }
+                // 清理audio元素
+                const audio = tile.querySelector('audio');
+                if (audio) {
+                    audio.srcObject = null;
+                }
+                tile.remove();
+                console.log(`Removed participant video tile for ${connectionId}`);
+            }
+
+            // 如果没有 participant 了，隐藏网格，显示单路远端视频
+            const remainingTiles = grid.querySelectorAll('[data-participant-id]');
+            if (remainingTiles.length === 0) {
+                grid.classList.add('hidden');
+                // 显示单路远端视频区域（恢复默认）
+                const remoteVideoDiv = this.elements.remoteVideo?.closest('.absolute.inset-0.video-fade-in');
+                if (remoteVideoDiv) {
+                    remoteVideoDiv.classList.remove('hidden');
+                }
+                // 显示远端视频占位符
+                if (this.elements.remoteVideoPlaceholder) {
+                    this.elements.remoteVideoPlaceholder.classList.remove('hidden');
+                }
+            } else {
+                // 调整网格列数
+                if (remainingTiles.length <= 1) {
+                    grid.style.gridTemplateColumns = '1fr';
+                } else if (remainingTiles.length <= 4) {
+                    grid.style.gridTemplateColumns = 'repeat(2, 1fr)';
+                } else {
+                    grid.style.gridTemplateColumns = 'repeat(3, 1fr)';
+                }
+            }
+        }
+
         // 更新远程用户状态显示为离线
         if (this.elements.remoteNetworkIndicator) {
             this.elements.remoteNetworkIndicator.className = 'w-2 h-2 bg-gray-500 rounded-full';
         }
-        // 显示断开连接的遮罩层（如果存在）
-        if (this.elements.disconnectedOverlay) {
-            this.elements.disconnectedOverlay.classList.remove('hidden');
-        }
     }
 
     // 获取状态文本

WebApp/client/public/onebyone/store.js

@@ -19,7 +19,8 @@ class CallStateManager {
                 status: 'idle' // 初始状态为空闲
             },
             localStream: null,  // MediaStream 对象
-            remoteStream: null  // MediaStream 对象
+            remoteStream: null,  // 单路远端流（兼容旧逻辑，participant端使用）
+            remoteStreams: {}     // 多路远端流 Map: { connectionId: MediaStream }（host端使用）
         };
 
         // 监听器数组
@@ -380,12 +381,16 @@ this.renderstreaming.onNewPeer = (connectionId) => {
             this.updateRemoteUserStatus('offline');
             this.updateRemoteUserNetworkQuality('no_signal');
             showNotification('对方已离开通话', 'warning');
-            // 清理远端流，重置Peer连接为新participant加入做准备
+            // 清理该 participant 的远端流
+            if (this.state.remoteStreams[connectionId]) {
+                this.state.remoteStreams[connectionId].getTracks().forEach(track => track.stop());
+                delete this.state.remoteStreams[connectionId];
+            }
+            // 同时清理单路远端流（兼容）
             if (this.state.remoteStream) {
                 this.state.remoteStream.getTracks().forEach(track => track.stop());
                 this.state.remoteStream = null;
             }
-            this.notify({ type: 'REMOTE_STREAM_OBTAINED', stream: null });
             // 通知UI更新
             this.notify({ type: 'PARTICIPANT_LEFT', connectionId: connectionId });
         };
@@ -394,25 +399,48 @@ this.renderstreaming.onNewPeer = (connectionId) => {
         this.renderstreaming.onTrackEvent = (data) => {
             const direction = data.transceiver.direction;
             if (direction == "sendrecv" || direction == "recvonly") {
+                // 获取当前连接的远端流
+                const trackConnectionId = this.connectionId;
+                // Host端: 每个participant有独立的远端流
+                // Participant端: 只有一个host的远端流
+                const isHost = this.role === 'host';
+
+                // 获取或创建对应的远端流
+                let targetStream = null;
+                if (isHost) {
+                    // Host端: 按 connectionId 管理多路远端流
+                    if (!this.state.remoteStreams[trackConnectionId]) {
+                        this.state.remoteStreams[trackConnectionId] = new MediaStream();
+                    }
+                    targetStream = this.state.remoteStreams[trackConnectionId];
+                } else {
+                    // Participant端: 使用单一远端流
                     if (this.state.remoteStream == null) {
                         this.state.remoteStream = new MediaStream();
                     }
+                    targetStream = this.state.remoteStream;
+                }
 
                 // 检查是否已经有相同类型的轨道
-                const existingTracks = this.state.remoteStream.getTracks().filter(track => track.kind === data.track.kind);
+                const existingTracks = targetStream.getTracks().filter(track => track.kind === data.track.kind);
 
                 // 移除旧的轨道
                 existingTracks.forEach(track => {
-                    this.state.remoteStream.removeTrack(track);
+                    targetStream.removeTrack(track);
                     console.log('Removed old track:', track.kind);
                 });
 
                 // 添加新的轨道
-                this.state.remoteStream.addTrack(data.track);
+                targetStream.addTrack(data.track);
-                console.log('Added new track:', data.track.kind);
+                console.log('Added new track:', data.track.kind, 'to stream:', trackConnectionId);
 
                 // 通知UI远程流已更新
-                this.notify({ type: 'REMOTE_STREAM_OBTAINED', stream: this.state.remoteStream });
+                this.notify({
+                    type: 'REMOTE_STREAM_OBTAINED',
+                    stream: targetStream,
+                    connectionId: trackConnectionId,
+                    isHost: isHost
+                });
                 console.log('Notified UI about remote stream update');
                 // 只有当收到远程流时才更新远程用户状态为在线
                 if (this.state.session.remoteUser.status !== 'online') {