media-recorder-api
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>拍照2</title>
</head>
<body>
<div style="display: block">
<button id="take" >拍照</button>
<button onclick="upload()" >保存照片</button>
<button onclick="closeapp()" >退出</button>
</div>
<div class="voidetop" style="position: relative;display: block">
<video id="v" width="350" style="height: 100%; padding: 0;margin:50px 0;border:10px solid #f00;background: #022" ></video>
<canvas id="canvas" style="display:none;"></canvas>
</div>
<br />
<div class="voideimg" style="position: absolute; left: 480px; top: 100px; width: 370px; height: 370px;" >
<img height="350" width="350" src="http://placehold.it/640&text=Your%20image%20here%20..." id="photo" alt="photo">
</div>
<script>
!(function () {
// 老的浏览器可能根本没有实现 mediaDevices，所以我们可以先设置一个空的对象
if (navigator.mediaDevices === undefined) {
navigator.mediaDevices = {};
}
if (navigator.mediaDevices.getUserMedia === undefined) {
navigator.mediaDevices.getUserMedia = function (constraints) {
// 首先，如果有getUserMedia的话，就获得它
var getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
// 一些浏览器根本没实现它 - 那么就返回一个error到promise的reject来保持一个统一的接口
if (!getUserMedia) {
return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
}
// 否则，为老的navigator.getUserMedia方法包裹一个Promise
return new Promise(function (resolve, reject) {
getUserMedia.call(navigator, constraints, resolve, reject);
});
}
}
const constraints = {
video: true,
audio: false
};
let videoPlaying = false;
let v = document.getElementById('v');
let promise = navigator.mediaDevices.getUserMedia(constraints);
promise.then(stream => {
// 旧的浏览器可能没有srcObject
if ("srcObject" in v) {
v.srcObject = stream;
} else {
// 防止再新的浏览器里使用它，应为它已经不再支持了
v.src = window.URL.createObjectURL(stream);
}
v.onloadedmetadata = function (e) {
v.play();
videoPlaying = true;
};
}).catch(err => {
console.error(err.name + ": " + err.message);
})
document.getElementById('take').addEventListener('click', function () {
if (videoPlaying) {
let canvas = document.getElementById('canvas');
canvas.width = v.videoWidth;
canvas.height = v.videoHeight;
canvas.getContext('2d').drawImage(v, 0, 0);
let data = canvas.toDataURL('image/webp');
document.getElementById('photo').setAttribute('src', data);
}
}, false);
})();
function upload() {
var d = document.getElementById("photo").toDataURL("image/jpeg");
d = d.slice(d.indexOf(",") + 1);
ajaxRequest(frmMain.hfrWebCamPic, "saveimg", ["img="+d]);
}
function closeapp() {
ajaxRequest(frmMain.hfrWebCamPic, "closeapp", []);
}
</script>
</body>
</html>
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