Javascript webcam capture and upload to server with PHP

Question

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 correc

Answer 1

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);

Now the js/jquery, css and 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>

---

Based on :
https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/Taking_still_photos
https://stackoverflow.com/a/13198699/797495
https://stackoverflow.com/a/31128229/797495

---

Note:
I've tested the code on my server and it works as intended.

Answer 2

You can add :

.canvas{display:block;}

Answer 3

The FILES Upload name is imageNameHere not file. To access the data you should replace imageNameHere with file or change the php code. Otherwise the dataUrl on uploading may not in base64?