<html>
<head>
<title>webRTC</title>
<meta content="charset=utf-8">
</head>
<body>
<div class="camera">
<video id="video">Video stream not available.</video>
<button id="startbutton">Take photo</button>
</div>
<canvas id="canvas">
</canvas>
<div class="output">
<img id="photo" alt="The screen capture will appear in this box.">
</div>
<script>
var width = 320; // We will scale the photo width to this
var height = 0; // This will be computed based on the input stream
var streaming = false;
var video = null;
var canvas = null;
var photo = null;
var startbutton = null;
function startup() {
video = document.getElementById('video');
canvas = document.getElementById('canvas');
photo = document.getElementById('photo');
startbutton = document.getElementById('startbutton');
}
startup();
navigator.mediaDevices.getUserMedia({ video: true, audio: false })
.then(function(stream) {
video.srcObject = stream;
video.play();
})
.catch(function(err) {
console.log("An error occured! " + err);
});
video.addEventListener('canplay', function(ev){
if (!streaming) {
height = video.videoHeight / (video.videoWidth/width);
video.setAttribute('width', width);
video.setAttribute('height', height);
canvas.setAttribute('width', width);
canvas.setAttribute('height', height);
streaming = true;
}
}, false);
startbutton.addEventListener('click', function(ev){
takepicture();
ev.preventDefault();
}, false);
function clearphoto() {
var context = canvas.getContext('2d');
context.fillStyle = "#AAA";
context.fillRect(0, 0, canvas.width, canvas.height);
var data = canvas.toDataURL('image/png');
photo.setAttribute('src', data);
}
// clearphoto();
function takepicture() {
var context = canvas.getContext('2d');
if (width && height) {
canvas.width = width;
canvas.height = height;
context.drawImage(video, 0, 0, width, height);
// var data = canvas.toDataURL('image/png');
// photo.setAttribute('src', data);
} else {
clearphoto();
}
}
</script>
</body>
</html>
