Javascript网络摄像头捕获和上传到服务器与PHP [英] Javascript webcam capture and upload to server with PHP
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问题描述
我有一个页面与成功图像上传表单画布使用javascript和PHP上传文件。第二页具有成功的网络摄像机捕获到画布并正确显示。我试图适应图像上传脚本与凸轮捕获的活css对象没有什么...
的html是：
snap
i have one page with a success image upload form canvas using a javascript and PHP upload file. the second page has a successful webcam capture to canvas and displays correctly. i am trying to adapt the image upload script with the cam capture the live css object does nothing... the html is: snap
<div id="upContent">
<div class="upload-wrapper">
<span id="upCanvas">Upload This Canvas</span>
</div>
<div class="return-data"></div>
</div>
<script src="js/interactioncam.js"></script>
<script src="https://code.jquery.com/jquery-1.10.2.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<!--script src="js/holder.js"></script-->
，Java脚本为：
//interactioncam.js - grab a pic
(function() {
var data;
var dataURL;
var streaming = false,
video = document.querySelector('#video'),
cover = document.querySelector('#cover'),
canvas = document.querySelector('#canvas'),
photo = document.querySelector('#photo'),
startbutton = document.querySelector('#startbutton'),
width = 320,
height = 240;
navigator.getMedia = ( navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
navigator.getMedia(
{
video: true,
audio: false
},
function(stream) {
if (navigator.mozGetUserMedia) {
video.mozSrcObject = stream;
} else {
var vendorURL = window.URL || window.webkitURL;
video.src = vendorURL ? vendorURL.createObjectURL(stream) : stream;
}
video.play();
},
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);
function takepicture() {
canvas.width = width;
canvas.height = height;
canvas.getContext('2d').drawImage(video, 0, 0, width, height);
var data = canvas.toDataURL('image/png');
var dataURL = canvas.toDataURL();
photo.setAttribute('src', data);
};
startbutton.addEventListener('click', function(ev){
takepicture();
ev.preventDefault();
}, false);
// Convert DataURL to Blob object
function dataURLtoBlob(dataURL) {
// Decode the dataURL
var dataURL = canvas.toDataURL();
var binary = atob(dataURL.split(',')[1]);
// Create 8-bit unsigned array
var array = [];
for(var i = 0; i < binary.length; i++) {
array.push(binary.charCodeAt(i));
}
// Return our Blob object
return new Blob([new Uint8Array(array)], {type: 'image/png'});
}
// Send IT
$("#upCanvas").live("click", function(){
$("#upCanvas").html("<img src='img/load.gif' alt='load'> Uploading ..");
// Convert Canvas DataURL
var dataURL= canvas.toDataURL();
// Get Our File
var file= dataURLtoBlob(dataURL);
// Create new form data
var fd = new FormData();
// Append our image
fd.append("imageNameHere", file);
$.ajax({
url: "uploadFile.php",
type: "POST",
data: fd,
processData: false,
contentType: false,
}).done(function(respond){
$("#upCanvas").html("Upload This Canvas");
$(".return-data").html("Uploaded Canvas image link: <a href="+respond+">"+respond+"</a>").hide().fadeIn("fast");
});
});
})();
php上传是：
<?php
$allowedExts = array("gif", "jpeg", "jpg", "png");
$temp = explode(".", $_FILES["file"]["name"]);
$extension = end($temp);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png"))
&& ($_FILES["file"]["size"] < 20000)
&& in_array($extension, $allowedExts))
{
if ($_FILES["file"]["error"] > 0)
{
echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br>";
echo "Type: " . $_FILES["file"]["type"] . "<br>";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";
if (file_exists("upload/" . $_FILES["file"]["name"]))
{
echo $_FILES["file"]["name"] . " already exists. ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"],
"upload/" . $_FILES["file"]["name"]);
echo "Stored in: " . "upimg/" . $_FILES["file"]["name"];
}
}
}
else
{
echo "Invalid file";
}
?>
有关为什么我无法获取canvas转换为文件和上传脚本工作的任何建议？
any suggestions as to why i cannot get the canvas converted to a file and the upload script to work?
推荐答案
您需要将捕获的图像发布到 php ，因为你可以使用 jquery .ajax（），这里有一个完整的例子：
You need to post the captured image to php, for that you can use jquery .ajax(), here's a complete example:
upload.php
<?php
$img = !empty($_REQUEST['imgBase64']) ? $_REQUEST['imgBase64'] : die("No image was posted");
$imgName = $_REQUEST['imgName'];
$img = str_replace('data:image/png;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$fileData = base64_decode($img);
//saving
file_put_contents($imgName, $fileData);
现在 js / jquery ， css 和 html ：
(function() {
// The width and height of the captured photo. We will set the
// width to the value defined here, but the height will be
// calculated based on the aspect ratio of the input stream.
var width = 320; // We will scale the photo width to this
var height = 0; // This will be computed based on the input stream
// |streaming| indicates whether or not we're currently streaming
// video from the camera. Obviously, we start at false.
var streaming = false;
// The various HTML elements we need to configure or control. These
// will be set by the startup() function.
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');
navigator.getMedia = (navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
navigator.getMedia({
video: true,
audio: false
},
function(stream) {
if (navigator.mozGetUserMedia) {
video.mozSrcObject = stream;
} else {
var vendorURL = window.URL || window.webkitURL;
video.src = vendorURL.createObjectURL(stream);
}
video.play();
},
function(err) {
console.log("An error occured! " + err);
}
);
video.addEventListener('canplay', function(ev) {
if (!streaming) {
height = video.videoHeight / (video.videoWidth / width);
// Firefox currently has a bug where the height can't be read from
// the video, so we will make assumptions if this happens.
if (isNaN(height)) {
height = width / (4 / 3);
}
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);
clearphoto();
}
// Fill the photo with an indication that none has been
// captured.
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);
}
// Capture a photo by fetching the current contents of the video
// and drawing it into a canvas, then converting that to a PNG
// format data URL. By drawing it on an offscreen canvas and then
// drawing that to the screen, we can change its size and/or apply
// other changes before drawing it.
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);
$.ajax({
type: "POST",
url: "upload.php",
data: {
imgBase64: data,
imgName: "webcam.png"
}
}).done(function(o) {
console.log('saved');
});
} else {
clearphoto();
}
}
// Set up our event listener to run the startup process
// once loading is complete.
window.addEventListener('load', startup, false);
})();
#video {
border: 1px solid black;
box-shadow: 2px 2px 3px black;
width:320px;
height:240px;
}
#photo {
border: 1px solid black;
box-shadow: 2px 2px 3px black;
width:320px;
height:240px;
}
#canvas {
display:none;
}
.camera {
width: 340px;
display:inline-block;
}
.output {
width: 340px;
display:inline-block;
}
#startbutton {
display:block;
position:relative;
margin-left:auto;
margin-right:auto;
bottom:32px;
background-color: rgba(0, 150, 0, 0.5);
border: 1px solid rgba(255, 255, 255, 0.7);
box-shadow: 0px 0px 1px 2px rgba(0, 0, 0, 0.2);
font-size: 14px;
font-family: "Lucida Grande", "Arial", sans-serif;
color: rgba(255, 255, 255, 1.0);
}
.contentarea {
font-size: 16px;
font-family: "Lucida Grande", "Arial", sans-serif;
width: 760px;
}
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>
<meta charset='utf-8'>
</head>
<body>
<div class="contentarea">
<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>
</div>
</body>
</html>
基于：
https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/Taking_still_photos
http://stackoverflow.com/a/13198699/797495
http://stackoverflow.com/a/31128229/797495
注意：
我已经测试了我的服务器上的代码，并按预期工作。
Note:
I've tested the code on my server and it works as intended.
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