Created
February 17, 2012 09:12
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Take a picture with getUserMedia
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| <html> | |
| <body> | |
| <video id="v" width="300" height="300"></video> | |
| <input id="b" type="button" disabled="true" value="Take Picture"></input> | |
| <canvas id="c" style="display:none;" width="300" height="300"></canvas> | |
| </body> | |
| <script> | |
| navigator.getUserMedia({video: true}, function(stream) { | |
| var video = document.getElementById("v"); | |
| var canvas = document.getElementById("c"); | |
| var button = document.getElementById("b"); | |
| video.src = stream; | |
| button.disabled = false; | |
| button.onclick = function() { | |
| canvas.getContext("2d").drawImage(video, 0, 0, 300, 300, 0, 0, 300, 300); | |
| var img = canvas.toDataURL("image/png"); | |
| alert("done"); | |
| }; | |
| }, function(err) { alert("there was an error " + err)}); | |
| </script> | |
| </html> |
I ran into some problems when I tried this gist on Chrome > v55:
- The
navigator.getUserMedia()method is deprecated in favor ofnavigator.mediaDevices.getUserMedia()(https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia, no more prefixes!). - As noted by @Jackbennett,
video.src = streamfails and should be replaced with a valid URL, that we can generate like this:
video.src = window.URL.createObjectURL(stream);- I needed to dynamically create and resize the canvas to take the full picture of the webcam.
Here's a working example (tested on Chrome 55, Firefox 51):
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>HTML5 Media Device Access</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
video, img {
max-width:100%;
}
</style>
</head>
<body>
<video autoplay></video>
<script>
(function() {
'use strict';
var video = document.querySelector('video')
, canvas;
/**
* generates a still frame image from the stream in the <video>
* appends the image to the <body>
*/
function takeSnapshot() {
var img = document.querySelector('img') || document.createElement('img');
var context;
var width = video.offsetWidth
, height = video.offsetHeight;
canvas = canvas || document.createElement('canvas');
canvas.width = width;
canvas.height = height;
context = canvas.getContext('2d');
context.drawImage(video, 0, 0, width, height);
img.src = canvas.toDataURL('image/png');
document.body.appendChild(img);
}
// use MediaDevices API
// docs: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia
if (navigator.mediaDevices) {
// access the web cam
navigator.mediaDevices.getUserMedia({video: true})
// permission granted:
.then(function(stream) {
video.src = window.URL.createObjectURL(stream);
video.addEventListener('click', takeSnapshot);
})
// permission denied:
.catch(function(error) {
document.body.textContent = 'Could not access the camera. Error: ' + error.name;
});
}
})();
</script>
</body>
</html>
@TobiasSeitz Please replace video.src = window.URL.createObjectURL(stream) with video.srcObject = stream, as createObjectURL with a stream as argument is being deprecated.
thank you so much help me a lot
@TobiasSeitz @jan-ivar Thank you so much, this will help me a lot!
Do you know how to make this work on iOS 11.3?
I know Instagram.com makes it work somehow.
thanks so much!!
I love you
Thank you so much.Really apreciate it
So GOOOOOOD
Show.
Congrants.
Sorry guys for me being lame, but where does canvas.toDataURL save the image? Thanks in advance.
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Commenting this old gist as it's a good google rank. Line 13 needs to be the following in order the stream the video preview.