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【推荐】碰一碰发视频源码搭建，支持OEM

news 来源：原创 2025/5/24 4:57:27

引言：重新定义视频分享体验

在移动优先的互联网时代，"碰一碰"交互已成为设备间快速连接的代名词。本文将突破传统文件传输思维，结合Web NFC与WebRTC技术，实现无需后端服务器的端到端视频实时传输方案。通过纯前端技术栈，开发者可以构建出媲美原生应用的近场交互体验。

一、技术选型解析

1. Web NFC技术栈

NDEFReader API：实现NFC标签的读取/写入
NDEFRecord：定义标准化的数据记录格式
SecurityContext：处理浏览器安全策略

2. 媒体传输方案

WebRTC：实现点对点视频流传输
MediaRecorder API：本地视频采集与编码
IndexedDB：离线视频缓存管理

3. 兼容性解决方案

特性检测策略：渐进式增强设计
Polyfill方案：兼容非NFC设备（备用二维码方案）

二、核心实现流程

阶段1：NFC连接建立

javascript

复制

class NFCConnector {
  constructor() {
    this.reader = new NDEFReader();
    this.writer = new NDEFReader();
  }

  async init() {
    try {
      await this.reader.scan();
      this._bindNFCEvents();
    } catch (error) {
      this._fallbackToQRCode();
    }
  }

  _bindNFCEvents() {
    this.reader.onreading = event => {
      const record = event.message.records[0];
      if (record.recordType === "mime:video-meta") {
        this._handleVideoMetadata(record);
      }
    };
  }

  async writeMetadata(videoMeta) {
    const record = {
      recordType: "mime:video-meta",
      mediaType: "application/json",
      data: JSON.stringify(videoMeta)
    };
    
    await this.writer.write({ records: [record] });
  }
}

阶段2：WebRTC点对点连接

javascript

复制

class P2PStreamer {
  constructor() {
    this.peerConnection = new RTCPeerConnection();
    this.dataChannel = null;
  }

  async createOffer() {
    this.dataChannel = this.peerConnection.createDataChannel("video");
    const offer = await this.peerConnection.createOffer();
    await this.peerConnection.setLocalDescription(offer);
    return offer;
  }

  async handleAnswer(answer) {
    await this.peerConnection.setRemoteDescription(answer);
  }

  setupDataChannel() {
    this.dataChannel.onmessage = event => {
      this._handleVideoChunk(event.data);
    };
  }

  async startStreaming(stream) {
    const recorder = new MediaRecorder(stream);
    recorder.ondataavailable = event => {
      if (this.dataChannel.readyState === "open") {
        this.dataChannel.send(event.data);
      }
    };
    recorder.start(1000);
  }
}

三、完整实现方案

1. 用户界面架构

html

复制

<div class="container">
  <!-- NFC状态指示 -->
  <div id="nfcStatus" class="status-indicator">
    <span class="led"></span>
    <span>NFC连接状态</span>
  </div>

  <!-- 视频控制区 -->
  <div class="video-container">
    <video id="localVideo" muted playsinline></video>
    <video id="remoteVideo" controls playsinline></video>
    <div class="control-bar">
      <button id="startBtn">开始录制</button>
      <button id="transferBtn" disabled>发送视频</button>
    </div>
  </div>

  <!-- 备用二维码容器 -->
  <div id="qrcodeFallback" class="hidden">
    <canvas id="qrcodeCanvas"></canvas>
  </div>
</div>

运行 HTML