10

我想显示连接到用户计算机的摄像机列表，当他们选择一个时，在 HTML5<video>标记中显示来自该摄像机的流式视频。

如何获取连接到用户计算机的摄像机列表？

4

4 回答 4

14

仅适用于 chrome 和 edge

<script>
     navigator.mediaDevices.enumerateDevices().then(function (devices) {
            for(var i = 0; i < devices.length; i ++){
                var device = devices[i];
                if (device.kind === 'videoinput') {
                    var option = document.createElement('option');
                    option.value = device.deviceId;
                    option.text = device.label || 'camera ' + (i + 1);
                    document.querySelector('select#videoSource').appendChild(option);
                }
            };
        });
</script>
 <select id="videoSource"></select>
于 2017-02-22T18:49:00.510 回答
6

也许Navigator.getUserMedia()（在引擎盖下使用WebRTC）是您正在寻找的东西，尽管我没有看到任何可以直接告诉您哪些设备可用的内容（设备列表不会暴露给您的代码 - 它呈现给用户请求访问可用硬件的权限时）。

还要注意浏览器支持：Chrome 21+、Firefox 20+、Opera 12+，不支持 IE，可能还有 Safari。

于 2013-09-19T11:58:19.823 回答
3

试试这个...

<!DOCTYPE html>
  <head>
      <meta charset="utf-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="author" content="Victor Stan">
      <meta name="description" content="Get multiple video streams on one page. Adapted from code by Muaz Khan">

      <title>Video Camera</title>

      <script src="//ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js" ></script>

      <style type="text/css" media="screen">
        video {
          border:1px solid gray;
        }
      </style>
  </head>
  <body>
    <script>
      if (!MediaStreamTrack) document.body.innerHTML = '<h1>Incompatible Browser Detected. Try <strong style="color:red;">Chrome Canary</strong> instead.</h1>';

      var videoSources = [];

      MediaStreamTrack.getSources(function(media_sources) {
        console.log(media_sources);
        alert('media_sources : '+media_sources);
        media_sources.forEach(function(media_source){
          if (media_source.kind === 'video') {
            videoSources.push(media_source);
          }
        });

        getMediaSource(videoSources);
      });

      var get_and_show_media = function(id) {
        var constraints = {};
        constraints.video = {
          optional: [{ sourceId: id}]
        };

        navigator.webkitGetUserMedia(constraints, function(stream) {
          console.log('webkitGetUserMedia');
          console.log(constraints);
          console.log(stream);

          var mediaElement = document.createElement('video');
          mediaElement.src = window.URL.createObjectURL(stream);
          document.body.appendChild(mediaElement);
          mediaElement.controls = true;
          mediaElement.play();

        }, function (e) 
        {
          alert('Hii');  
          document.body.appendChild(document.createElement('hr'));
          var strong = document.createElement('strong');
          strong.innerHTML = JSON.stringify(e);
          alert('strong.innerHTML : '+strong.innerHTML);
          document.body.appendChild(strong);
        });
      };

      var getMediaSource = function(media) {
        console.log(media);
        media.forEach(function(media_source) {
          if (!media_source) return;

          if (media_source.kind === 'video') 
          {
            // add buttons for each media item
            var button = $('<input/>', {id: media_source.id, value:media_source.id, type:'submit'});
            $("body").append(button);
            // show video on click
            $(document).on("click", "#"+media_source.id, function(e){
              console.log(e);
              console.log(media_source.id);
              get_and_show_media(media_source.id);
            });
          }
        });
      }
    </script>
  </body>
</html>
于 2013-09-20T06:45:10.093 回答
1

JavaScript cannot access your cameras to return a list. You will need to use a Flash SWF to get the camera information and pass it back to your page's JavaScript.

EDIT: to those who downvoted. These methods will not give him a dropdown list of available cameras. If it does, please post a link or code. At the current date, the only way to get a list of cameras (which is what his questions was) is to use Flash (or possibly silverlight, but Flash has much broader install coverage). I've edited my question to be a little more specific in terms of getting the list versus accessing a camera.

于 2013-09-19T11:50:18.373 回答