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 peerConnectionlet 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。