usb camera access with html code ⋆ Yawot

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To access a USB camera using HTML code, you typically need to use the getUserMedia API, which is part of the WebRTC (Real-Time Communication) standard. This API allows web browsers to access the user’s camera and microphone directly.

Here’s a basic example of HTML code to access a USB camera:


<html>

<head>

    <title>yawot.com</title>

</head>

<body>
   
                                    
 <video autoplay></video>
 
   <script>
        // get video dom element
        const video = document.querySelector('video');
  

      
        // request access to webcam
        navigator.mediaDevices.getUserMedia({video: {width: 300, height:280}}).then((stream) => video.srcObject = stream);
       
 
        // returns a frame encoded in base64
      
  const getFrame = () => {
const canvas = document.createElement('canvas');
     
       canvas.width = video.videoWidth;
      
      canvas.height = video.videoHeight;
  
  
        
        return data;
      
  }
        const WS_URL = location.origin.replace(/^http/, 'ws');
  
      const FPS = 3;
        const ws = new WebSocket(WS_URL);
  
      ws.onopen = () => {
            console.log(`Connected to ${WS_URL}`);
     
       setInterval(() => {
                ws.send(getFrame());
    
        }, 5000 / FPS);
     
   }
   
 </script>
</body>
</html>

n this example:

We have an HTML5 video element (<video>) with an id of “videoElement”.
In the JavaScript part, we use the navigator.mediaDevices.getUserMedia method to request access to the user’s camera. We specify { video: true } in the options object to request access to the video stream.
If the user grants permission, the video stream is attached to the <video> element using video.srcObject = stream;.
If there’s an error (e.g., the user denies access or the device doesn’t support getUserMedia), an error message is logged to the console.

Make sure to run this code on a web server (even a local one) as getUserMedia won’t work if you just open the HTML file directly due to browser security restrictions.

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Author: yawot

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