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要将树莓派上的摄像头流通过 WebRTC 传输到 HTML 页面中，你需要调整你的WebRTC信令服务器和树莓派客户端代码。以下是你需要做的步骤：
1. 修改树莓派客户端
在树莓派的客户端代码中，你需要将摄像头流推送到 WebRTC 的 RTCPeerConnection 中。以下是更新后的代码示例：
const io = require('socket.io-client'); const { exec } = require('child_process'); const socket = io('http://<你的公网服务器IP>:3000'); // WebRTC 连接 let peerConnection = new RTCPeerConnection({ iceServers: [{ urls: 'stun:stun.l.google.com:19302' }] }); // 处理 ICE 候选 socket.on('candidate', (candidate) => { peerConnection.addIceCandidate(new RTCIceCandidate(candidate)); }); // 开始摄像头流 function startCameraStream() { const ffmpeg = exec(`raspivid -o - -t 0 -vf -hf -n | ffmpeg -re -i pipe:0 -c:v copy -f mpegts udp://localhost:1234`); ffmpeg.stdout.on('data', (data) => { // 将视频流添加到 peerConnection let stream = new MediaStream(); let track = new MediaStreamTrack(data); stream.addTrack(track); peerConnection.addTrack(track); }); } // 启动摄像头流 startCameraStream(); // 处理 offer socket.on('offer', async (offer) => { await peerConnection.setRemoteDescription(new RTCSessionDescription(offer)); const answer = await peerConnection.createAnswer(); await peerConnection.setLocalDescription(answer); socket.emit('answer', answer); }); // 处理 answer socket.on('answer', (answer) => { peerConnection.setRemoteDescription(new RTCSessionDescription(answer)); }); 2. 修改 HTML 页面
在 HTML 页面中，你需要确保 WebRTC 连接正常，并可以接收到视频流。下面是更新后的 HTML 示例：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>WebRTC Camera Stream</title> </head> <body> <h1>WebRTC Camera Stream</h1> <video id="video" autoplay playsinline style="width: 100%; max-width: 800px;"></video> <script src="/socket.io/socket.io.js"></script> <script> const video = document.getElementById('video'); const socket = io(); const peerConnection = new RTCPeerConnection({ iceServers: [{ urls: 'stun:stun.l.google.com:19302' }] }); peerConnection.onicecandidate = (event) => { if (event.candidate) { socket.emit('candidate', event.candidate); } }; peerConnection.ontrack = (event) => { video.srcObject = event.streams[0]; }; async function startStream() { const offer = await peerConnection.createOffer(); await peerConnection.setLocalDescription(offer); socket.emit('offer', offer); } socket.on('offer', async (offer) => { await peerConnection.setRemoteDescription(new RTCSessionDescription(offer)); const answer = await peerConnection.createAnswer(); await peerConnection.setLocalDescription(answer); socket.emit('answer', answer); }); socket.on('answer', (answer) => { peerConnection.setRemoteDescription(new RTCSessionDescription(answer)); }); socket.on('candidate', (candidate) => { peerConnection.addIceCandidate(new RTCIceCandidate(candidate)); }); // 启动视频流 startStream(); </script> </body> </html> 注意事项
- 确保树莓派可以访问你的信令服务器，并且可以正确地发送和接收信令消息。
- 在使用
ffmpeg时，确保你安装了ffmpeg并且能够通过命令行访问。 - 根据需要调整
raspivid和ffmpeg的参数，以适应你特定的需求。
通过上述调整，你的树莓派摄像头流应该能够通过 WebRTC 传输到 HTML 页面中进行观看。
