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Webcam.html
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="javascript" type="text/javascript">
function initSourceWebcam(){
// init default value
var onError = function(error){
alert('Webcam Error\nName: '+error.name + '\nMessage: '+error.message);
}
var domElement = document.createElement('video');
domElement.setAttribute('autoplay', '');
domElement.setAttribute('muted', '');
domElement.setAttribute('playsinline', '');
domElement.style.width = document.documentElement.clientWidth + 'px';
domElement.style.height = document.documentElement.clientHeight + 'px';
// check API is available
if(navigator.mediaDevices === undefined || navigator.mediaDevices.enumerateDevices === undefined || navigator.mediaDevices.getUserMedia === undefined){
if(navigator.mediaDevices === undefined){
var fctName = 'navigator.mediaDevices';
}
else if(navigator.mediaDevices.enumerateDevices === undefined){
var fctName = 'navigator.mediaDevices.enumerateDevices';
}
else if(navigator.mediaDevices.getUserMedia === undefined){
var fctName = 'navigator.mediaDevices.getUserMedia';
}
else{
console.assert(false);
}
onError({
name: '',
message: 'WebRTC issue-! '+fctName+' not present in your browser'
});
return null;
}
// get available devices
navigator.mediaDevices.enumerateDevices().then(function(devices){
var userMediaConstraints = {
audio: false,
video: {
facingMode: 'environment',
}
}
// get a device which satisfy the constraints
navigator.mediaDevices.getUserMedia(userMediaConstraints).then(function success(stream){
domElement.srcObject = stream;
document.body.addEventListener('click', function(){
domElement.play();
});
// wait until the video stream is ready
var interval = setInterval(function(){
if(!domElement.videoWidth){
return;
}
stage.appendChild(domElement);
clearInterval(interval);
}, 1000/50);
}).catch(function(error){
onError({
name: error.name,
message: error.message
});
});
}).catch(function(error){
onError({
message: error.message
});
});
return domElement;
}
</script>
</head>
<body>
<button onclick="initSourceWebcam()">Click me</button>
</body>
</html>