记一次webRTC本地多摄像头数据流获取

主要思路

根据 获取到的devies列表中将视频和音频过滤出来 api: navigator.mediaDevices.enumerateDevices 获取可枚举的设备列表

返回值 ：{id:每一个设备的独立ID,kind:不一样类型的设备,}

获取媒体流：navigator.mediaDevices.getUserMedia() 这个函数必须传入要获取的媒体类型约束，格式为{video:true,audio:true} 返回一个 MediaDtream的Promise对象。经过将媒体类型约束修改为{video: { deviceId: ele.deviceId }}来根据不一样的设备id来获取不一样的媒体流。而后将多个媒体流赋值给多个video标签来渲染就OK

<template>
  <div id="app">
    <div class="container"></div>
    <li v-for="(ele,index) in media_List" :key="index">{{ele.label}}</li>
  </div>
</template>

<script>

  export default {
    data() {
      return {
        media_List: []
      };
    },
    async mounted() {
      const audioinput = [], videoinput = [];
      let list = await navigator.mediaDevices.enumerateDevices({video: true, audio: true});
      this.media_List = list;
      const _this = this, container = document.querySelector(".container");
      list.map(async (ele) => {
        if (ele.kind === "audioinput") audioinput.push(ele);
        else if (ele.kind === "videoinput") {
          console.log(ele);
          let config = {
            video: {
              deviceId: ele.deviceId
            }
          };
          let stream = await navigator.mediaDevices.getUserMedia(config);
          let video_tag = document.createElement("video");
          video_tag.autoplay = "autoplay";
          video_tag.srcObject = stream;
          container.append(video_tag);
        }
      });
    }
  };
</script>
<style>
  video {
    width: 500px;
    height: 500px;
    border: 1px solid;
  }
</style>

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