网页端UVC相机测试_艾孜尔江撰
multiCam.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<video id="video" width="400" height="400" style="background-color: coral;"></video>
<video id="video1" width="400" height="400" style="background-color: chartreuse;"></video>
<p>
<canvas id="canvas1" width="400" height="400" style="background-color: blueviolet;"></canvas>
<canvas id="canvas1" width="400" height="400" style="background-color: brown;"></canvas>
</p>
<body>
<script src="./multiCam.js"></script>
</body>
</html>
multiCam.js:
// 获取页面视频元素
var video = document.getElementById('video');
var video1 = document.getElementById('video1');
navigator.mediaDevices.enumerateDevices().then(getMyDevices).catch(handleError);
// 遍历所有的设备，包括视频和音频设备，找出 RGB相机设备。
function getMyDevices(deviceInfos) {
let constraints = new Array(2);
let id = 0;
for (let i = 0; i !== deviceInfos.length; ++i) {
let deviceInfo = deviceInfos[i];
console.log("device info: " + Object.keys(deviceInfo));
if (deviceInfo.kind === 'videoinput') {
console.log("$$$$$");
console.log("label: " + deviceInfo.label);
// if (deviceInfo.label.search("RGB") !== -1) {
if (deviceInfo.label.search("Full HD webcam") !== -1) {
console.log("deviceID is ###: " + deviceInfo.deviceId);
constraints[id] = {
video: {
deviceId: deviceInfo.deviceId
},
// audio: true,
video: { width: 1280, height: 720 }
};
id = id + 1;
}
}
}
navigator.mediaDevices.getUserMedia(constraints[0]).
then(getStreamFromCamA).catch(handleError);
navigator.mediaDevices.getUserMedia(constraints[0]).
then(getStreamFromCamB).catch(handleError);
}
function getStreamFromCamA(stream) {
window.stream = stream; // make stream available to console
video.srcObject = stream;
video.play();
}
function getStreamFromCamB(stream) {
window.stream = stream; // make stream available to console
video1.srcObject = stream;
video1.play();
}
function handleError(error) {
console.log('Error: ', error);
}
// var id = setInterval(function () {
// console.log("drawing...");
// draw(id)
// }, 24);
function draw(id) {
localStorage.interval_id = id;
let canvas = document.querySelector('canvas');
canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
}
uvc.html:
<!DOCTYPE html>
<html>
<head>
<title>HTML5 code Reader</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<style type="text/css">
html,
body {
height: 100%;
width: 100%;
text-align: center;
}
</style>
<!-- <script src="jquery-1.9.1.js"></script> -->
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script>
//这段代 主要是获取摄像头的视频流并显示在Video 签中
var canvas = null, context = null, video = null;
window.addEventListener("DOMContentLoaded", function () {
try {
canvas = document.getElementById("canvas");
context = canvas.getContext("2d");
video = document.getElementById("video");
var videoObj = { "video": true, audio: false },
flag = true,
MediaErr = function (error) {
flag = false;
if (error.PERMISSION_DENIED) {
alert('用户拒绝了浏览器请求媒体的权限', '提示');
} else if (error.NOT_SUPPORTED_ERROR) {
alert('对不起，您的浏览器不支持拍照功能，请使用其他浏览器', '提示');
} else if (error.MANDATORY_UNSATISFIED_ERROR) {
alert('指定的媒体类型未接收到媒体流', '提示');
} else {
alert('系统未能获取到摄像头，请确保摄像头已正确安装。或尝试刷新页面，重试', '提示');
}
};
//获取媒体的兼容代码，目前只支持（Firefox,Chrome,Opera）
if (navigator.getUserMedia) {
//qq浏览器不支持
if (navigator.userAgent.indexOf('MQQBrowser') > -1) {
alert('对不起，您的浏览器不支持拍照功能，请使用其他浏览器', '提示');
return false;
}
navigator.getUserMedia(videoObj, function (stream) {
video.src = stream;
video.play();
}, MediaErr);
}
else if (navigator.webkitGetUserMedia) {
navigator.webkitGetUserMedia(videoObj, function (stream) {
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, MediaErr);
}
else if (navigator.mozGetUserMedia) {
navigator.mozGetUserMedia(videoObj, function (stream) {
video.src = window.URL.createObjectURL(stream);
video.play();
}, MediaErr);
}
else if (navigator.msGetUserMedia) {
navigator.msGetUserMedia(videoObj, function (stream) {
$(document).scrollTop($(window).height());
video.src = window.URL.createObjectURL(stream);
video.play();
}, MediaErr);
} else {
alert('对不起，您的浏览器不支持拍照功能，请使用其他浏览器');
return false;
}
if (flag) {
alert('为了获得更准确的测试结果，请尽量将二维码置于框中，然后进行拍摄、扫描。 请确保浏览器有权限使用摄像功能');
}
//这个是拍照按钮的事件，
$("#snap").click(function () { startPat(); }).show();
} catch (e) {
printHtml("浏览器不支持HTML5 CANVAS");
}
}, false);
//打印内容到页面
function printHtml(content) {
$(window.document.body).append(content + "<br/>");
}
//开始拍照
function startPat() {
setTimeout(function () {//防止调用过快
if (context) {
context.drawImage(video, 0, 0, 320, 320);
CatchCode();
}
}, 200);
}
//抓屏获取图像流，并上传到服务器
function CatchCode() {
if (canvas != null) {
//以下开始编 数据
var imgData = canvas.toDataURL();
//将图像转换为base64数据
var base64Data = imgData;//.substr(22); //在前端截取22位之后的字符串作为图像数据
//开始异步上
$.post("saveimg.php", { "img": base64Data }, function (result) {
printHtml("解析结果：" + result.data);
if (result.status == "success" && result.data != "") {
printHtml("解析结果成功！");
} else {
startPat();//如果没有解析出来则重新抓拍解析
}
}, "json");
}
}
</script>
<body>
<div id="support"></div>
<div id="contentHolder">
<video id="video" width="320" height="320" autoplay>
</video>
<canvas style="display:none; background-color:#F00;" id="canvas" width="320" height="320">
</canvas> <br />
<button id="snap" style="display:none; height:50px; width:120px;">开始扫描</button>
</div>
</body>
</html>
-
项目结构：
-
测试效果：
作者：艾孜尔江
转载或使用请务必标明出处！
本文来自博客园，作者：艾孜尔江，转载请注明原文链接：https://www.cnblogs.com/ezhar/p/14919953.html
