<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> 设备管理后台</title>
</head>
<body >
<div >
<!-- 内容主体区域 -->
<div >
<video id="video" width="480" height="320" controls></video>
</div>
<div >
<input type="button" id="capture" value="拍照"/>
</div>
<div >
<canvas id="canvas" width="480" height="480"></canvas>
</div>
</div>
</body>
</html>
<script>
window.onload = function () {
//访问用户媒体设备的兼容方法
function getUserMedia(constraints, success, error) {
if (navigator.mediaDevices.getUserMedia) {
//最新的标准API
navigator.mediaDevices.getUserMedia(constraints).then(success).catch(error);
} else if (navigator.webkitGetUserMedia) {
//webkit核心浏览器
navigator.webkitGetUserMedia(constraints, success, error)
} else if (navigator.mozGetUserMedia) {
//firfox浏览器
navigator.mozGetUserMedia(constraints, success, error);
} else if (navigator.getUserMedia) {
//旧版API
navigator.getUserMedia(constraints, success, error);
}
}
/*
var exArray = []; //存储设备源ID
MediaStreamTrack.getSources(function (sourceInfos) {
for (var i = 0; i != sourceInfos.length; ++i) {
var sourceInfo = sourceInfos[i];
//这里会遍历audio,video，所以要加以区分
if (sourceInfo.kind === 'video') {
exArray.push(sourceInfo.id);
}
}
});
*/
let video = document.getElementById('video');
let canvas = document.getElementById('canvas');
let context = canvas.getContext('2d');
function success(stream) {
//兼容webkit核心浏览器
let CompatibleURL = window.URL || window.webkitURL;
//将视频流设置为video元素的源
// console.log(stream);
//video.src = CompatibleURL.createObjectURL(stream);
video.srcObject = stream;
video.play();
}
function error(error) {
console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
}
if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia) {
if (!navigator.mediaDevices || !navigator.mediaDevices.enumerateDevices) {
console.log("enumerateDevices() not supported.");
return;
}
// 列出摄像头和麦克风
var exArray = [];
navigator.mediaDevices.enumerateDevices()
.then(function (devices) {
devices.forEach(function (device) {
// console.log(device.kind + ": " + device.label +
// " id = " + device.deviceId);
if (device.kind == "videoinput") {
// alert(device.label);
exArray.push(device.deviceId);
}
});
var mediaOpts = { video: { width: 420, height: 120 } };
var mediaOpts =
{
video:
{
deviceId: { exact: exArray[1] }
}
};
//调用用户媒体设备, 访问摄像头
getUserMedia(mediaOpts, success, error);
})
.catch(function (err) {
console.log(err.name + ": " + err.message);
});
} else {
alert('不支持访问用户媒体');
}
var img = new Image();
document.getElementById('capture').addEventListener('click', function () {
context.drawImage(video, 0, 0, 480, 320);
var image_data = context.getImageData(0, 0, 480, 320);
// var string = OCRAD(image_data.data);
// string = _arrayBufferToBase64(image_data);
var image = new Image();
image.src = canvas.toDataURL("image/jpeg");
// return image;
// alert(image.src);
})
}
</script>
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